Power supply device

A plurality of required DC voltages are outputted. A power supply device includes: a first switch circuit corresponding to the plurality of battery devices, and that includes a switch for connecting a negative pole terminal, by which negative pole terminals of the battery devices are connected, and a first switch for connecting a positive pole terminal, by which positive pole terminals of the battery devices are connected, and a switch for bypassing, by which the battery devices are bypassed; and a second switch circuit corresponding to the plurality of battery devices, and that includes a second switch for connecting a positive pole terminal, by which positive pole terminals of the battery devices are connected, and a switch for connecting, by which the negative pole terminals of the battery devices are connected to a positive pole terminal of the other battery device.

TECHNICAL FIELD

The present invention relates to a power supply device in which connections of a plurality of battery devices are switched and controlled by a switch, and a plurality of DC voltages are outputted from the plurality of battery devices.

BACKGROUND ART

In a conventional power supply device in which a plurality of battery devices are connected in series, taps are connected to the battery devices at both ends and the battery device at a middle position, whereby a plurality of DC voltages can be extracted (for example, refer to Patent Document 1).

CONVENTIONAL ART DOCUMENT

Patent Document

SUMMARY OF THE INVENTION

Problems to be Solved by the Invention

In the Patent Document 1, a plurality of battery devices are connected in series, and other hand, taps are connected to the battery devices at both ends and the battery device at a middle position, whereby a plurality of DC voltages are extracted. However, the battery device, which is connected to a ground, is fixed, so that when a DC voltage is extracted from the battery device at the middle position, there has been a problem in that a positive pole and a negative pole of the battery device, which is near to a ground with respect to the above-described battery device, are short-circuited, and it is caused that a circuit is broken or fired.

The present invention has been made to solve above-described problems, and an object of the invention is to obtain a power supply device in which a circuit is not easily broken.

Means for Solving Problems

A power supply device of the present invention includes a plurality of battery devices which include positive pole terminals and negative pole terminals; a first circuit for connecting battery device, which is configured between a first terminal positive pole and a terminal negative pole; a first switch circuit which is provided in such a way that the first switch circuit is corresponding to each of the battery devices in the plurality of battery devices, and includes a switch for connecting negative pole terminal, by which a negative pole terminal of the corresponded battery device is connected to the first circuit for connecting battery device, a first switch for connecting positive pole terminal, by which a positive pole terminal of the corresponded battery device is connected to the first circuit for connecting battery device, and a switch for bypassing, by which the corresponded battery device is bypassed; a second circuit for connecting battery device, which is configured between a second terminal positive pole and the terminal negative pole; a second switch circuit which is provided in such a way that the second switch circuit is corresponding to each of the battery devices in the plurality of battery devices, and includes a second switch for connecting positive pole terminal, by which a positive pole terminal of the corresponded battery device is connected to the second circuit for connecting battery device, and a switch for connecting, by which the negative pole terminal of the corresponded battery device is connected to the positive pole terminal of the other battery device; and a control circuit which controls an open/close operation of each of the switches of the first switch circuit and the second switch circuit; wherein open/close operations of the plurality of switches of the first switch circuit are controlled by the control circuit, and one or a plurality of required battery devices is connected between the first terminal positive pole and the terminal negative pole; and open/close operations of the plurality of switches of the second switch circuit are controlled by the control circuit, and one or a plurality of required battery devices is connected between the second terminal positive pole and the terminal negative pole.

Effects of the Invention

In a power supply device according to the present invention, a battery device, which is connected to a terminal negative pole, can be selected by a first switch circuit and a second switch circuit, so that the battery device is rarely short-circuited, and a DC voltage can be extracted from a battery device at a middle position.

An aim, a characteristic, a viewpoint, and an effect of the present invention, which are not described in the above explanations, will be cleared by the following detail explanations for the present invention in reference to drawings.

MODE FOR CARRYING OUT THE INVENTION

FIG. 1is a circuit diagram illustrating a configuration of a power supply device according to Embodiment 1 of the present invention. InFIG. 1, for example, a nickel metal hydride battery or a lithium-ion battery is used as a battery device.

A first switch circuit9(first switch circuit) is configured by the following components. A drain terminal of a MOSFET9a(first switch for connecting positive pole terminal) is connected to a positive pole terminal of a battery device3, and a source terminal of the MOSFET9a(first switch for connecting positive pole terminal) is connected to a drain terminal of a MOSFET9d(switch for bypassing), and a connection point of the source terminal of the MOSFET9aand the drain terminal of the MOSFET9dis connected to a positive pole1a(first terminal positive pole) of a first extraction terminal1. A drain terminal of a MOSFET9g(switch for connecting negative pole terminal) is connected to a negative pole terminal of the battery device3, and a source terminal of the MOSFFT9gis connected to a source terminal of the MOSFET9d. A drain terminal of a MOSFET9b(first switch for connecting positive pole terminal) is connected to a positive pole terminal of a battery device4, and a source terminal of the MOSFET9bis connected to a drain terminal of a MOSFET9e(switch for bypassing), and a connection point of the source terminal of the MOSFET9band the drain terminal of the MOSFET9eis connected to the source terminal of the MOSFET9d.

A negative pole terminal of the battery device4is connected to a drain terminal of a MOSFET9h(switch for connecting negative pole terminal), and a source terminal of the MOSFET9his connected to a source terminal of the MOSFET9e. A positive pole terminal of a battery device5is connected to a drain terminal of a MOSFET9c(first switch for connecting positive pole terminal), and a source terminal of the MOSFET9cis connected to a drain terminal of a MOSFET9f(switch for bypassing), and a connection point of the source terminal of the MOSFET9cand the drain terminal of the MOSFET9fis connected to the source terminal of the MOSFET9e. A negative pole terminal of the battery device5is connected to a drain terminal of a MOSFET9i(switch for connecting negative pole terminal), and a source terminal of the MOSFET9iis connected to a source terminal of the MOSFET9f, and a connection point of the source terminal of the MOSFET9iand the source terminal of the MOSFET9fis connected to a ground7. The ground7is connected to a negative pole1b(terminal negative pole) of the first extraction terminal1.

A second switch circuit10(second switch circuit) is configured by the following components. The negative pole terminal of the battery device3is connected to a source terminal of a MOSFET10a(switch for connecting), and a drain terminal of the MOSFET10ais connected to a source terminal of a MOSFET10b(second switch for connecting positive pole terminal), and a connection point of the drain terminal of the MOSFET10aand the source terminal of the MOSFET10bis connected to the positive pole terminal of the battery device4. The negative pole terminal of the battery device4is connected to a source terminal of a MOSFET10c(switch for connecting), and a drain terminal of the MOSFET10cis connected to a source terminal of a MOSFET10d(second switch for connecting positive pole terminal), and a connection point of the drain terminal of the MOSFET10cand the source terminal of the MOSFET10dis connected to the positive pole terminal of the battery device5. The negative pole terminal of the device5is connected to a source terminal of a MOSFET10e(switch for connecting), and a drain terminal of the MOSFET10eis connected to a source terminal of a MOSFET10f(second switch for connecting positive pole terminal), and a connection point of the drain terminal of the MOSFET10eand the source terminal of the MOSFET10fis connected to the positive pole terminal of the battery device3. A drain terminal of the MOSFET10b, a drain terminal of the MOSFET10d, and a drain terminal of the MOSFET10fare connected, and a connection point of the drain terminal of the MOSFET10b, the drain terminal of the MOSFET10d, and the drain terminal of the MOSFET10fis connected to a positive pole2a(a second terminal positive pole) of a second extraction terminal2. A ground8is connected to a negative pole2b(terminal negative pole) of the second extraction terminal2. The ground7and the ground8are set at an identical reference electric potential point.

A control circuit6performs turn-on/turn-off control of each of the MOSFETs which compose the first switch circuit9and the second switch circuit10. The control circuit6is realized by using, for example, a process circuit, and the process circuit includes a CPU by which a program, which is stored in a memory, is performed.

Hereinafter, an operation, in which a DC voltage is extracted from the battery device3, the battery device4, and battery device5to the first extraction terminal1and the second extraction terminal2, will be explained.

In the first switch circuit9, as indicated inFIG. 2, the MOSFET9c, the MOSFET9d, the MOSFET9e, and the MOSFET9iare turned on, and the other MOSFETs are turned off, whereby the ground7is connected to the negative pole terminal of the battery device5, and a DC voltage of the battery device5is extracted to the positive pole1aof the first extraction terminal1. A first electric current25is flowed from the ground7to the source terminal of the MOSFET9i, the drain terminal of the MOSFET9i, a negative pole of the battery device5, a positive pole of the battery device5, the drain terminal of the MOSFET9c, the source terminal of the MOSFET9c, the source terminal of the MOSFET9e, the drain terminal of the MOSFET9e, the source terminal of the MOSFET9d, the drain terminal of the MOSFET9d, and the positive pole1aof the first extraction terminal1. In the second switch circuit10, the MOSFET10a, the MOSFET10c, and the MOSFET10fare turned on, and the other MOSFETs are turned off, whereby a DC voltage, for which the battery device3, the battery device4, and the battery device5are connected in series, is extracted to the positive pole2aof the second extraction terminal2.

A second electric current26is flowed from the ground7to the source terminal of the MOSFET9i, the drain terminal of the MOSFET9i, the negative pole of the battery device5, the positive pole of the battery device5, the drain terminal of the MOSFET10c, the source terminal of the MOSFET10c, a negative pole of the battery device4, a positive pole of the battery device4, the drain terminal of the MOSFET10a, the source terminal of the MOSFET10a, a negative pole of the battery device3, a positive pole of the battery device3, the source terminal of the MOSFET10f, the drain terminal of the MOSFET10f, and the positive pole2aof the second extraction terminal2.

In this case, the second switch circuit10, the MOSFET10dis turned on, and the other MOSFETs are turned off, wherein a DC voltage of only the battery device5can be extracted to the positive pole2aof the second extraction terminal2. Moreover, in the second switch circuit10, the MOSFET10cand the MOSFET10bare turned on, and the other MOSFETs are turned off, whereby a DC voltage, for which the battery device5and the battery device4are connected in series, can be extracted to the positive pole2aof the second extraction terminal2.

Moreover, in the first switch circuit9, as indicated inFIG. 3, the MOSFET9b, the MOSFET9d, the MOSFET9f, and the MOSFET9hare turned on, and the other MOSFETs are turned off, whereby the ground7is connected to the negative pole terminal of the battery device4, and a DC voltage of the battery device4is extracted to the positive pole1aof the first extraction terminal1. The first electric current25is flowed from the ground7to the source terminal of the MOSFET9f, the drain terminal of the MOSFET9f, the source terminal of the MOSFET9h, the drain terminal of the MOSFET9h, the negative pole of the battery device4, the positive pole of the battery device4, the drain terminal of the MOSFET9b, the source terminal of the MOSFET9b, the source terminal of the MOSFET9d, the drain terminal of the MOSFET9d, and the positive pole1aof the first extraction terminal1. In the second switch circuit10, the MOSFET10a, the MOSFET10d, and the MOSFET10eare turned on, and the other MOSFETs are turned off, whereby a DC voltage, for which the battery device3, the battery device4, and the battery device5are connected in series, is extracted to the positive pole2aof the second extraction terminal2.

The second electric current26is flowed from the ground7to the source terminal of the MOSFET9f, the drain terminal of the MOSFET9f, the source terminal of the MOSFET9h, the drain terminal of the MOSFET9h, the negative pole of the battery device4, the positive pole of the battery device4, the drain terminal of the MOSFET10a, the source terminal of the MOSFET10a, the negative pole of the battery device3, the positive pole of the battery device3, the drain terminal of the MOSFET19e, the source terminal of the MOSFET10e, the negative pole of the battery device5, the positive pole of the battery device5, the source terminal of the MOSFET10d, the drain terminal of the MOSFET10d, and the positive pole2aof the second extraction terminal2.

Moreover, in the first switch circuit9, as indicated inFIG. 4, the MOSFET9a, the MOSFET9e, the MOSFET9f, and the MOSFET9gare turned on, and the ether MOSFETs are turned off, whereby the ground7is connected to the negative pole terminal of the battery device3, and a DC voltage of the battery device3is extracted to the positive pole1aof the first extraction terminal1. The first electric current25is flowed from the ground7to the source terminal of the MOSFET9f, the drain terminal of the MOSFET9f, the source terminal of the MOSFET9e, the drain terminal of the MOSFET9e, the source terminal of the MOSFET9g, the drain terminal of the MOSFET9g, the negative pole of the battery device3, the positive pole of the battery device3, the drain terminal of the MOSFET9a, the source terminal of the MOSFET9a, and the positive pole1aof the first extraction terminal1. In the second switch circuit10, the MOSFET10b, the MOSFET10c, and the MOSFET10eare turned on, and the other MOSFETs are turned off, whereby a DC voltage, for which the battery device3, the battery device4, and the battery device5are connected in series, is extracted to the positive pole2aof the second extraction terminal2.

The second electric current26is flowed from the ground7to the source terminal of the MOSFET9f, the drain terminal of the MOSFET9f, the source terminal of the MOSFET9e, the drain terminal off the MOSFET9e, the source terminal of the MOSFET9g, the drain terminal of the MOSFET9g, the negative pole of the battery device3, the positive pole of the battery device3, the drain terminal of the MOSFET10e, the source terminal of the MOSFET10e, the negative pole of the battery device5, the positive pole of the battery device5, the drain terminal of the MOSFET10c, the source terminal of the MOSFET10c, the negative pole of the battery device4, the positive pole of the battery device4, the source terminal of the MOSFET10b, the drain terminal of the MOSFET10b, and the positive pole2aof the second extraction terminal2.

Moreover, in the first switch circuit9, as indicated inFIG. 5, the MOSFET9b, the MOSFET9c, the MOSFET9d, the MOSFET9h, and the MOSFET9iare turned on, and the other MOSFETs are turned off, whereby the ground7is connected to the negative pole terminal of the battery device5, and a DC voltage, for which the battery device4and the battery device5are connected in series, is extracted to the positive pole1aof the first extraction terminal1. The first electric current25is flowed from the ground7to the source terminal of the MOSFET9i, the drain terminal of the MOSFET9i, the negative pole of the battery drive5, the positive pole of the battery device5, the drain terminal of the MOSFET9c, the source terminal of the MOSFET9c, the source terminal of the MOSFET9h, the drain terminal of the MOSFET9h, the negative pole of the battery device4, the positive pole of the battery device4, the drain terminal of the MOSFET9b, the source terminal of the MOSFET9b, the source terminal of the MOSFET9d, the drain terminal of the MOSFET9d, and the positive pole1aof the first extraction terminal1. In the second switch circuit10, the MOSFET10a, the MOSFET10c, and the MOSFET10fare turned on, and the other MOSFETs are turned off, whereby a DC voltage, for which the battery device3, the battery device4, and the battery device5are connected in series, is extracted to the positive pole2aof the second extraction terminal2.

The second electric current26is flowed from the ground7to the source terminal of the MOSFET9i, the drain terminal of the MOSFET9i, the negative pole of the battery device5, the positive pole of the battery device5, the drain terminal of the MOSFET10c, the source terminal of the MOSFET10c, the negative pole of the battery device4, the positive pole of the battery device4, the drain terminal of the MOSFET10a, the source terminal of the MOSFET10a, the negative pole of the battery device3, the positive pole of the battery device3, the source terminal of the MOSFET10f, the drain terminal of the MOSFET10f, and the positive pole2aof the second extraction terminal2.

Moreover, in the first switch circuit9, as indicated inFIG. 6, the MOSFET9a, the MOSFET9b, the MOSFET9f, the MOSFET9g, and the MOSFET9hare turned on, and the other MOSFETs are turned off, whereby the ground7is connected to the negative pole terminal of the battery device4, and a DC voltage, for which the battery device3and the battery device4are connected in series, is extracted to the positive pole1aof the first extraction terminal1. The first electric current25is flowed from the ground7to the source terminal of the MOSFET9f, the drain terminal of the MOSFET9f, the source terminal of the MOSFET9h, the drain terminal of the MOSFET9h, the negative pole of the battery device4, the positive pole of the battery device4, the drain terminal of the MOSFET9b, the source terminal of the MOSFET9b, the source terminal of the MOSFET9g, the drain terminal of the MOSFET9g, the negative pole of the battery device3, the positive pole of the battery device3, the drain terminal of the MOSFET9a, the source terminal of the MOSFET9a, and the positive pole1aof the first extraction terminal1. In the second switch circuit10, the MOSFET10a, the MOSFET10d, and the MOSFET10eare turned on, and the other MOSFETs are turned off, whereby a DC voltage, for which the battery device3, the battery device4, and the battery device5are connected in series, is extracted to the positive pole2aof the second extraction terminal2.

The second electric current is flowed from the ground7to the source terminal of the MOSFET9f, the drain terminal of the MOSFET9f, the source terminal of the MOSFET9h, the drain terminal of the MOSFET9h, the negative pole of the battery device4, the positive pole of the battery device4, the drain terminal of the MOSFET10a, the source terminal of the MOSFET10a, the negative pole of the battery device3, the positive pole of the battery device3, the drain terminal of the MOSFET10e, the source terminal of the MOSFET10e, the negative pole of the battery device5, the positive pole of the battery device5, the source terminal of the MOSFET10d, the drain terminal of the MOSFET10d, and the positive pole2aof the second extraction terminal2.

Moreover, in the first switch circuit9, as indicated inFIG. 7, the MOSFET9a, the MOSFET9b, the MOSFET9c, the MOSFET9g, the MOSFET9h, and the MOSFET9iare turned on, and the other MOSFETs are turned off, whereby the ground7is connected to the negative pole terminal of the battery device5, and a DC voltage, for which the battery device3, the battery device4, and the battery device5are connected in series, extracted to the positive pole1aof the first extraction terminal1. The first electric current25is flowed from the ground7to the source terminal of the MOSFET9i, the drain terminal of the MOSFET9i, the negative pole of the battery device5, the positive pole of the battery device5, the drain terminal of the MOSFET9c, the source terminal of the MOSFET9c, the source terminal of the MOSFET9h, the drain terminal of the MOSFET9h, the negative pole of the battery device4, the positive pole of the battery device4, the drain terminal of the MOSFET9b, the source terminal of the MOSFET9b, the source terminal of the MOSFET9g, the drain terminal of the MOSFET9g, the negative pole of the battery device3, the positive pole of the battery device3, the drain terminal of the MOSFET9a, the source terminal of the MOSFET9a, and the positive pole1aof the first extraction terminal1. In the second switch circuit10, the MOSFET10a, the MOSFET10c, and the MOSFET10fare turned on, and the other MOSFETs are turned off, whereby a DC voltage, for which the battery device3, the battery device4, and the battery device5are connected in series, is extracted to the positive pole2aof the second extraction terminal2.

The second electric current26is flowed from the ground7to the source terminal of the MOSFET9i, the drain terminal of the MOSFET9i, the negative pole of the battery device5, the positive pole of the battery device5, the drain terminal of the MOSFET10c, the source terminal of the MOSFET10c, the negative pole of the battery device4, the positive pole of the battery device4, the drain terminal of the MOSFET10a, the source terminal of the MOSFET10a, the negative pole of the battery device3, the positive pole of the battery device3, the source terminal of the MOSFET10f,the drain terminal of the MOSFET10f, and the positive pole2aof the second extraction terminal2.

In a first circuit for connecting battery device, which is provided between the first terminal positive pole1aand the terminal negative pole1b, when any one of the MOSFET9athrough the MOSFET9iis turned on, the turned on MOSFET is extracted, and when any one of the battery device3through the battery device5is energized, the energized battery device is extracted, whereby the first circuit for connecting battery device is configured. However, electric current passages, which are constantly extracted to the first circuit for connecting battery device, are an electric current passage1c, an electric current passage1d, an electric current passage1e, and an electric current passage1f, which are indicated in the following description. In addition, the electric current passage1cis extended from the positive pole1ato a connection point of the MOSFET9aand the MOSFET9d, and the electric current passage1dis extended from a connection point of the MOSFET9dand the MOSFET9gto a connection point of the MOSFET9band the MOSFET9e, and the electric current passage1eis extended from a connection point of the MOSFET9eand the MOSFET9hto a connection point of the MOSFET9cand the MOSFET9fand the electric current passage1fis extended from a connection point of the MOSFET9fand the MOSFET9ito the negative pole1b. In addition, in the first switch circuit9, as indicated inFIG. 7, the MOSFET9a, the MOSFET9c, the MOSFET9e, the MOSFET9g, and the MOSFET9iare turned on, and the other MOSFETs are turned off, whereby the ground7is connected to the negative pole terminal of the battery device5, and a DC voltage, for which the battery device3and the battery device5are connected in series, is extracted to the positive pole1aof the first extraction terminal1. In other words, the switch MOSFET9efor bypassing is turned on, whereby the battery device4is bypassed, and a DC voltage, for which the battery device3and the battery device5are connected in series, can be extracted.

In a second circuit for connecting battery device, which is provided between the second terminal positive pole2aand the terminal negative pole2b, when any one of the MOSFET10athrough the MOSFET10fis turned on, the turned on MOSFET is extracted, and when any one of the battery device3through the battery device5is energized, the energized battery device is extracted, whereby the second circuit for connecting battery device is configured. However, electric current passages, which are constantly extracted to the second circuit for connecting battery device, are an electric current passage2cand an electric current passage2d, which are indicated in the following description. In addition, the electric current passage2cis extended from the positive pole2ato a connection point of the MOSFET10b,the MOSFET10d, and the MOSFET10f, and the electric current passage2dis extended from the negative pole2bto the ground8.

As a result, a battery device, which is connected to a ground, can be selected by the first switch circuit9, so that the battery device is not short-circuited, and a DC voltage can be extracted from a battery device at some midpoint. In addition, in Embodiment 1 of the present invention, although the power supply device is explained by using a MOSFET (a field-effect transistor) as a switch, a similar effect is obtained even when a bipolar transistor, an insulation-type bipolar transistor (IGBT), a silicon carbide transistor, or a silicon carbide MOSFET is used.

A circuit diagram of a power supply device according to Embodiment 2 of the present invention is illustrated inFIG. 8. The power supply device according to Embodiment 2, in which a smoothing reactor11and a smoothing capacitor12are added, is different from the power supply device according to Embodiment 1. In particular, the smoothing reactor11is connected between a connection point of a source terminal of a MOSFET9aand a drain terminal of a MOSFET9dand a positive pole1aof a first extraction terminal1, and the smoothing capacitor12is connected between the positive polo1aof the first extraction terminal1and a negative pole1b.In addition, the smoothing reactor11may be provided at an electric current passage between a required battery device, which is connected to the negative pole1b, and the positive pole1aof the first extraction terminal1.

Hereinafter, an operation, in which a voltage is extracted from a battery device3, a battery device4, and a battery device5to the first extraction terminal1and a second extraction terminal2, will be explained. In a first switch circuit9, as indicated inFIG. 9, the MOSFET9a, a MOSFET9b, a MOSFET9c, a MOSFET9g, a MOSFET9h, and a MOSFET9iare turned on, and the other MOSFETs are tuned off, whereby energy is supplied to the first extraction terminal1. A first electric current25is flowed from a ground7to a source terminal of the MOSFET9i, a drain terminal of the MOSFET9i, a negative pole of the battery device5, a positive pole of the battery device5, a drain terminal of the MOSFET9c, a source terminal of the MOSFET9c, a source terminal of the MOSFET9h, a drain terminal of the MOSFET9h, a negative pole of the battery device4, a positive pole of the battery device4, a drain terminal of the MOSFET9b, a source terminal of the MOSFET9b, a source terminal of the MOSFET9g, a drain terminal of the MOSFET9g, a negative pole of the battery device3, a positive pole of the battery device3, a drain terminal of the MOSFET9a, the source terminal of the MOSFET9a, and the positive pole1aof the first extraction terminal1. In this case, the smoothing reactor11is excited, and energy is accumulated in the smoothing reactor11. Hereinafter, a state, in which the smoothing reactor11is excited, is defined as an excitation state.

In a second switch circuit10, a MOSFET10a, a MOSFET10c, and a MOSFET10fare turned on, and the other MOSFETs are turned off, whereby a DC voltage, for which the battery device3, the battery device4, and the battery device5are connected in series, is extracted to the second extraction terminal2. A second electric current26is flowed from the ground7to the source terminal of the MOSFET9i, the drain terminal of the MOSFET9i, the negative pole of the battery device5, the positive pole of the battery device5, a drain terminal of the MOSFET10c, a source terminal of the MOSFET10c, the negative pole of the battery device4, the positive pole of the battery device4, a drain terminal of the MOSFET10a, a source terminal of the MOSFET10a, the negative pole of the battery device3, the positive pole of the battery device3, a source terminal of the MOSFET10f, a drain terminal of the MOSFET10f, and a positive pole2aof the second extraction terminal2.

After an operation, which is indicated inFIG. 9, is performed, in the first switch circuit9, as indicated inFIG. 10, the MOSFET9d, a MOSFET9e, and a MOSFET9fare turned on, and the other MOSFETs are turned off, whereby energy is flowed back by the smoothing reactor11by using the accumulated energy in order to continue that the energy is supplied to the first extraction terminal1. Hereinafter, a state, in which energy is flowed back by the smoothing reactor11by using the accumulated energy, is defined as a flowed-back state. Elapsed time, in which the smoothing reactor11is set at an excitation state, and the smoothing reactor11is sifted from the excitation state to a flowed-back state, and the smoothing reactor11is sifted from the flowed-back state to the excitation state again, is defined as one cycle. InFIG. 10, the first electric current25is flowed from the ground7to a source terminal of the MOSFET9f, a drain terminal of the MOSFET9f, a source terminal of the MOSFET9e, a drain terminal of the MOSFET9e, a source terminal of the MOSFET9d, the drain terminal of the MOSFET9d, and the positive pole1aof the first extraction terminal1. The second electric current26is flowed from the ground7to the source terminal of the MOSFET9i, the drain terminal of the MOSFET9i, the negative pole of the battery device5, the positive pole of the battery device5, the drain terminal of the MOSFET10c, the source terminal of the MOSFET10c, the negative pole of the battery device4, the positive pole of the battery device4, the drain terminal of the MOSFET10a, the source terminal of the MOSFET10a, the negative pole of the battery device3, the positive pole of the battery device3, the source terminal of the MOSFET10f,the drain terminal of the MOSFET10f, and the positive pole2aof the second extraction terminal2.

The MOSFETs in the first switch circuit9are switched by the control circuit6in such a way that an operation (excitation state), which is indicated inFIG. 9, and an operation (flowed-back state), which is indicated inFIG. 10, are repeated. In this case, a ratio of the operation (excitation state), which is indicated inFIG. 9, during one cycle is increased, whereby a ramp-state voltage, which is varied form 0 V to a DC voltage, for which the battery device3, the battery device4, and the battery device5are connected in series, can be extracted to the first extraction terminal1.

Moreover, in the first switch circuit9, as indicated inFIG. 11, the MOSFET9b, the MOSFET9c, the MOSFET9d, the MOSFET9h, and the MOSFET9iare turned on, and the other MOSFETs are turned off, whereby energy is supped to the first extraction terminal1. In this case, the smoothing reactor11is excited, and the energy is accumulated in the smoothing reactor11. The first electric current25is flowed from the ground7to the source terminal of the MOSFET9i, the drain terminal of the MOSFET9i, the negative pole of the battery device5, the positive pole of the battery device5, the drain terminal of the MOSFET9c, the source terminal of the MOSFET9c, the source terminal of the MOSFET9h, the drain terminal of the MOSFET9h, the negative pole of the battery device4, the positive pole of the battery device4, the drain terminal of the MOSFET9b,the source terminal of the MOSFET9b, the source terminal of the MOSFET9d, the drain terminal of the MOSFET9d, and the positive pole1aof the first extraction terminal1. In the second witch circuit10, the MOSFET10a, the MOSFET10c, and the MOSFET10fare turned on, and the other MOSFETs are turned off, whereby a DC voltage, for which the battery device3, the battery device4, and the battery device5are connected in series, is extracted to the second extraction terminal2.

The second electric current26is flowed from the ground7to the source terminal of the MOSFET9i, the drain terminal of the MOSFET9i, the negative pole of the battery device5, the positive pole of the battery device5, the drain terminal of the MOSFET10c, the source terminal of the MOSFET10c, the negative pole of the battery device4, the positive pole of the battery device4, the drain terminal of the MOSFET10a, the source terminal of the MOSFET10a, the negative pole of the battery device3, the positive pole of the battery device3, the source terminal of the MOSFET10f,the drain terminal of the MOSFET10f, and the positive pole2aof the second extraction terminal2.

In one cycle in which an operation (excitation state), winch is indicated inFIG. 11, and an operation (flowed-back state), which is indicated inFIG. 10, are included, an operation, which is similar to the above-described operation, is performed, whereby a ramp-state voltage, which is varied from 0 V to a DC voltage, for which the battery device4and the battery device5are connected in series, can be extracted to the first extraction terminal1.

Moreover, in the first switch circuit9, as indicated inFIG. 12, the MOSFET9a, the MOSFET9b, the MOSFET9f, the MOSFET9g, and the MOSFET9hare turned on, and the other MOSFETs are turned off, whereby energy is supplied to the first extraction terminal1. The first electric current25is flowed from the ground7to the source terminal of the MOSFET9f, the drain terminal of the MOSFET9f, the source terminal at the MOSFET9h, the drain terminal of the MOSFET9h, the negative pole of the battery device4, the positive pole of the battery device4, the drain terminal of the MOSFET9b, the source terminal of the MOSFET9b, the source terminal of the MOSFET9g, the drain terminal of the MOSFET9g, the negative pole of the battery device3, the positive pole of the battery device3, the drain terminal of the MOSFET9a, the source terminal of the MOSFET9a, and the positive pole1aof the first extraction terminal1. In this case, the smoothing reactor11. is excited, and the energy is accumulated in the smoothing reactor11. In the second switch circuit10, the MOSFET10a, the MOSFET10d, and the MOSFET10eare turned on, and the other MOSFETs are turned off, whereby a DC voltage, for which the battery device3, the battery device4, and the battery device5are connected in series, is extracted to the second extraction terminal2.

The second electric current26is flowed from the ground7to the source terminal of the MOSFET9f, the drain terminal of the MOSFET9f, the source terminal of the MOSFET9h, the drain terminal of the MOSFET9h, the negative pole of the battery device4, the positive pole of the battery device4, the drain terminal of the MOSFET10a, the source terminal of the MOSFET10a, the negative pole of the battery device3, the positive pole of the battery device3, the drain terminal of the MOSFET10e, the source terminal of the MOSFET10e, the negative pole of the battery device5, the positive pole of the battery device5, the source terminal of the MOSFET10d,the drain terminal of the MOSFET10d, and the positive pole2aof the second extraction terminal2.

In one cycle in which an operation (excitation state), which is indicated inFIG. 12, and an operation (flowed-back state), which is indicated inFIG. 10, are included, an operation, which is similar to the above-described operation, is performed, whereby a ramp-state voltage, which is varied from 0 V to a DC voltage, for which the battery device3and the battery device4are connected in series, can be extracted to the first extraction terminal1.

Moreover, in the first switch circuit9, as indicated inFIG. 13, the MOSFET9c, the MOSFET9d, the MOSFET9e, and the MOSFET9iare turned on, and the other MOSFETs are turned off, whereby energy is supplied to the first extraction terminal1. In this case, the smoothing reactor11is excited, and the energy is accumulated in the smoothing reactor11. The first electric current25is flowed from the ground7to the source terminal of the MOSFET9i, the drain terminal of the MOSFET9i, the negative pole of the battery device5, the positive pole of the battery device5, the drain terminal of the MOSFET9c, the source terminal of the MOSFET9c, the source terminal of the MOSFET9e, the drain terminal of the MOSFET9e, the source terminal of the MOSFET9d, the drain terminal of the MOSFET9d, the smoothing reactor11, and the positive pole1aof the first extraction terminal1. In the second switch circuit10, the MOSFET10a, the MOSFET10c, and the MOSFET10fare turned on, and the other MOSFETs are turned off, whereby a DC voltage, for which the battery device3, the battery device4, and the battery device5are connected in series, is extracted to the second extraction terminal2.

The second electric current26is flowed from the ground7to the source terminal of the MOSFET9i, the drain terminal of the MOSFET9i, the negative pole of the battery device5, the positive pole of the battery device5, the drain terminal of the MOSFET10c, the source terminal of the MOSFET10c, the negative pole of the battery device4, the positive pole of the battery device4, the drain terminal of the MOSFET10a, the source terminal of the MOSFET10a, the negative pole of the battery device3, the positive pole of the battery device3, the source terminal of the MOSFET10f,the drain terminal of the MOSFET10f, and the positive pole2aof the second extraction terminal2.

In one cycle in which an operation (excitation state), which is indicated inFIG. 13, and an operation (flowed-back state), which is indicated inFIG. 10, are included, an operation, which is similar to the above-described operation, is performed, whereby a ramp-state voltage, which is varied from 0 V to a DC voltage of the battery device5, can be extracted to the first extraction terminal1.

Moreover, in the first switch circuit9, as indicated inFIG. 14, the MOSFET9b, the MOSFET9d, the MOSFET9f, and the MOSFET9hare turned on, and the other MOSFETs are turned off, whereby energy is supplied to the first extraction terminal1. In this case, the smoothing reactor11is excited, and the energy is accumulated in the smoothing reactor11. The first electric current25is flowed from the ground7to the source terminal of the MOSFET9f, the drain terminal of the MOSFET9f, the source terminal of the MOSFET9h, the drain terminal of the MOSFET9h,the negative pole of the battery device4, the positive pole of the battery device4, the drain terminal of the MOSFET9b, the source terminal of the MOSFET9b, the source terminal of the MOSFET9d, the drain terminal of the MOSFET9d, the smoothing reactor11, and the positive pole1aof the first extraction terminal1. In the second switch circuit10, the MOSFET10a, the MOSFET10d, and the MOSFET10eare turned on, and the other MOSFETs are turned off, whereby a DC voltage, for which the battery device3, the battery device4, and the battery device5are connected in series, is extracted to the second extraction terminal2.

The second electric current26is flowed from the ground7to the source terminal of the MOSFET9f, the drain terminal of the MOSFET9f, the source terminal of the MOSFET9h, the drain terminal of the MOSFET9h, the negative pole of the battery device4, the positive pole of the battery device4, the drain terminal of the MOSFET10a, the source terminal of the MOSFET10a, the negative pole of the battery device3, the positive pole of the battery device3, the drain terminal of the MOSFET10e, the source terminal of the MOSFET10e, the negative pole of the battery device5, the positive pole of the battery device5, the source terminal of the MOSFET10d,the drain terminal of the MOSFET10d, and the positive pole2aof the second extraction terminal2.

In one cycle in which an operation (excitation state), which is indicated inFIG. 14, and an operation (flowed-back state), which is indicated inFIG. 10, are included, an operation, which is similar to the above-described operation, is performed, whereby a ramp-state voltage, which is varied from 0 V to a DC voltage of the battery device4, can be extracted to the first extraction terminal1.

Moreover, in the first switch circuit9, as indicated inFIG. 15, the MOSFET9a, the MOSFET9e, the MOSFET9f, and the MOSFET9gare turned on, and the other MOSFETs are turned off, whereby energy is supplied to the first extraction terminal1. In this case, the smoothing reactor11is excited, and the energy is accumulated in the smoothing reactor11. The first electric current25is flowed from the ground7to the source terminal of the MOSFET9f, the drain terminal of the MOSFET9f, the source terminal of the MOSFET9e, the drain terminal of the MOSFET9e, the source terminal of the MOSFET9g, the drain terminal of the MOSFET9g, the negative pole of the battery device3, the positive pole of the battery device3, the drain terminal of the MOSFET9a, the source terminal of the MOSFET9ac, the smoothing reactor11, and the positive pole1aof the first extraction terminal1. In the second switch circuit10, the MOSFET10b, the MOSFET10c, and the MOSFET10eare turned on, and the other MOSFETs are turned off, whereby a DC voltage, for which the battery device3, the battery device4, and the battery device5are connected in series, is extracted to the second extraction terminal2.

The second electric current26is flowed from the ground7to the source terminal of the MOSFET9f, the drain terminal of the MOSFET9f, the source terminal of the MOSFET9e, the drain terminal of the MOSFET9e, the source terminal of the MOSFET9g, the drain terminal of the MOSFET9g,the negative pole of the battery device3, the positive pole of the battery device3, the drain terminal of the MOSFET10e, the source terminal of the MOSFET10e, the negative pole of the battery device5, the positive pole of the battery device5, the drain terminal of the MOSFET10e, the source terminal of the MOSFET10c, the negative pole of the battery device4, the positive pole of the battery device4, the source terminal of the MOSFET10b,the drain terminal of the MOSFET10b, and the positive pole2aof the second extraction terminal2.

In one cycle in which an operation (excitation state), which is indicated inFIG. 15, and an operation (flowed-back state), which is indicated inFIG. 10, are included, an operation, which is similar to the above-described operation, is performed, whereby a ramp-state voltage, which is varied from 0 V to a DC voltage of the battery device3, can be extracted to the first extraction terminal1.

As a result, the MOSFETs, which compose the first switch circuit9, are switched, whereby a ramp-state voltage can be extracted to the first extraction terminal1, so that an inrush electric current to the first extraction terminal1can be suppressed. In addition, in Embodiment 2 of the present invention, although the power supply device is explained by using a MOSFET (a field-effect transistor) as a switch, a similar effect is obtained even when a bipolar transistor, an insulation-type bipolar transistor (IGBT), a silicon carbide transistor, or a silicon carbide MOSFET is used.

Circuit diagrams of a power supply device according to Embodiment 3 of the present invention are illustrated inFIG. 16andFIG. 17. Operations of a first switch circuit9and a second switch circuit10in Embodiment 3 of the present invention are similar to operations which are indicated in Embodiment 1, so that an explanation is omitted. The power supply device according to Embodiment 3, in which a charging device13, which is used as a variable power supply device which is configured in such a way that a DC output voltage can be regulated, is added, is different from the power supply device according to Embodiment 1. In particular, a positive pole of the charging device13is connected to a positive pole1aof a first extraction terminal1, and a negative pole of the charging device13is connected to a negative pole1bof the first extraction terminal1.

The charging device13outputs a DC voltage in such a way that the outputted DC voltage is higher than a DC voltage which is extracted to the first extraction terminal1. As a result, an electric power can be supplied from the charging device13to a battery device3, a battery device4, and a battery device5, so that the battery devices can be charged. In particular, for example, in a connection state which is indicated inFIG. 2,FIG. 3,FIG. 4,FIG. 5,FIG. 6,FIG. 7,FIG. 9,FIG. 11,FIG. 12,FIG. 13,FIG. 14, orFIG. 15, a DC voltage is outputted from the charging device13in such a way that the outputted DC voltage is higher than a DC voltage which is extracted to the first extraction terminal1, whereby one or a plurality of the battery device3, the battery device4, and the battery device5, which are connected, can be charged.

Circuit diagrams of a power supply device according to Embodiment 4 of the present invention are illustrated inFIG. 18andFIG. 19. Operations of a first switch circuit9and a second switch circuit10in Embodiment 4 of the present invention are similar to operations which are indicated in Embodiment 1 and Embodiment 2, so that an explanation is omitted. The power supply device according to Embodiment 4, in which a first load16which is composed of an electric generator14and an inverter15for driving the electric generator14, a DC/DC converter17, by which a DC bus of the inverter15is connected to a low-voltage battery device18, a second load20which is composed of a low-voltage electrical component19which is connected to the low voltage battery device18, and a third load21which is composed of an electric load, are added, is different from the power supply devices according to Embodiment 1 and Embodiment 2.

A connection condition between each of configuration elements inFIG. 18will be explained. A positive pole1aof a first extraction terminal1, a DC voltage bus-side positive pole of the inverter15, and a DC voltage bus-side positive pole of the DC/DC converter17are connected, and a negative pole1bof the first extraction terminal1, a DC voltage bus-side negative pole of the inverter15, and a DC voltage bus-side negative pole of the DC/DC converter17are connected. A connection point of a source terminal of a MOSFET15aand a drain terminal of a MOSFET15b, and a connection point of a source terminal of a MOSFET15cand a drain terminal of a MOSFET15d, and a connection point of a source terminal of a MOSFET15eand a drain terminal of a MOSFET15f, which compose the inverter15, are connected to the electric generator14. The low-voltage battery device18and the low-voltage electrical component19are connected in parallel to a smoothing capacitor17ewhich composes the DC/DC converter17. A positive pole2aof a second extraction terminal2and a positive pole of the third load21are connected, and a negative pole2bof the second extraction terminal2and a negative pole of the third load21are connected. Although each of the inverter15and the DC/DC converter17has a function for controlling the inverter15and the DC/DC converter17are connected to a control circuit6in order to command an operation state to each of the configuration elements.

Hereinafter, a circuit configuration of each of the configuration elements will be explained. In the inverter15, the source terminal of the MOSFET15aand the drain terminal of the MOSFET15bare connected, and the source terminal of the MOSFET15cand the drain terminal of the MOSFET15dare connected, and the source terminal of the MOSFET15eand the drain terminal of the MOSFET15fare respectively connected. A drain terminal of the MOSFET15a, a drain terminal of the MOSFET15c,and a drain terminal of the MOSFET15eare connected, and a source terminal of the MOSFET15b, a source terminal of the MOSFET15d, and a source terminal of the MOSFET15fare connected. The drain terminal of the MOSFET15aand one terminal of ta smoothing capacitor15gare connected, and the source terminal of the MOSFET15band the other terminal of the smoothing capacitor15gare connected.

In the DC/DC converter17, a source terminal of a MOSFET17band a drain terminal of a MOSFET17care connected, and a connection point of the source terminal of the MOSFET17band the drain terminal of the MOSFET17cis connected to one terminal of a smoothing reactor17d. The other terminal of the smoothing reactor17dis connected to one terminal of a smoothing capacitor17e, and a source terminal of the MOSFET17cis connected to the other terminal of the smoothing capacitor17e. A drain terminal of the MOSFET17bis connected to one terminal of a smoothing capacitor17a, and a source terminal of a MOSFET17cis connected to the other terminal of the smoothing capacitor17a. The above-described circuit is configured, whereby the control circuit6controls each of the configuration elements while the control circuit6monitors an operation state of each of the configuration elements.

For example, the first switch circuit9, and second switch circuit10are operated in such a way that a DC voltage, which is extracted to the first extraction terminal1, is lowered when the electric generator14is started. As a result, it can be prevented that an excessive electric current is flowed to the electric generator14and the inverter15, and it can be avoided that the electric generator14and the inverter15are broken. Moreover, the DC voltage, which is extracted to the first extraction terminal1, is lowered, whereby a generation loss of the MOSFETs, which compose the inverter15, can be reduced, and a cooler of the inverter15can be simplified, and the inverter15can be downsized.

Moreover, for example, when the low-voltage electrical component19is a heavy load, the first switch circuit9and the second switch circuit10are similarly operated as described above. As a result, an input voltage of the DC/DC converter17is lowered, and a generation loss of the DC/DC converter17can be reduced, and a cooler of the DC/DC converter17can be simplified, and the DC/DC converter17can be downsized.

Moreover, for example, the first switch circuit9and the second switch circuit10are operated in such a way that a DC voltage, which is extracted to the first extraction terminal1, is raised when the electric generator14generates an electric power. As a result, a DC bus voltage is raised, and electric power generation energy of the electric generator14can be aggressively retrieved to the battery device3, the battery device4, and battery device5, and the battery device3, the battery device4, and battery device5can be charged.

In addition, in Embodiment 4 of the present invention, although the power supply device is explained by using a MOSFET (a field-effect transistor) as a switch, a similar effect is obtained even when a bipolar transistor, an insulation-type bipolar transistor (IGBT), a silicon carbide transistor, or a silicon carbide MOSFET is used. Moreover, in Embodiment 4, although a circuit configuration of the DC/DC converter17is explained by using a non-insulation type step-down chopper circuit, it is suitable that the DC/DC converter17can be step-downed, and a non-insulation type or insulation type circuit method is not particularly required.

Circuit diagrams of a power supply device according to Embodiment 5 are illustrated inFIG. 20andFIG. 21. Operations of a first switch circuit9and a second switch circuit10in Embodiment 5 are similar to operations which are indicated in Embodiment 1 and Embodiment 2, so that an explanation is omitted. The power supply device according to Embodiment 5, in which a third load21is composed of a high-voltage electrical component22which needs an input voltage which is higher than an input voltage of a low-voltage battery device18, is different from the power supply devices according to Embodiment 1 and Embodiment 2. As a result, an input voltage of the high-voltage electrical component22is set as a voltage, for which a battery device3, a battery device4, and a battery device5are connected in series, and the high-voltage electrical component22can be used without adding a DC/DC converter.

A circuit diagram of a power supply device according to Embodiment 6 of the present invention is illustrated inFIG. 22. The power supply device according to Embodiment 6, in which a third switch circuit23(third switch circuit) is added, and a MOSFET10g, by which a short circuit is prevented, is added in a second switch circuit24, is different from the power supply device according to Embodiment 1. In particular, the third switch circuit23is composed of a MOSFET23aand a MOSFET23b, which are connected in reverse series, and a drain terminal of the MOSFET23ais connected to a positive pole terminal of a battery device3, and a drain terminal of the MOSFET23bis connected to a positive pole terminal of a battery device5. Moreover, a drain terminal of the MOSFET10gin the second switch circuit24is connected to a drain terminal of a MOSFET10eand the positive pole terminal of the battery device3, and a source terminal of the MOSFET10gis connected to a source terminal of a MOSFET10f.

Hereinafter an operation, in which a voltage is extracted from the battery device3, a battery device4, and the battery device5to a first extraction terminal1and a second extraction terminal2, will be explained. In the first switch circuit9, as indicatedFIG. 23, a MOSFET9a, a MOSFET9b, a MOSFET9c, a MOSFET9g, a MOSFET9h, and a MOSFET9iare turned on, and the other MOSFETs are turned off, and the MOSFET23aand the MOSFET23bare turned off in the third switch circuit23, whereby a ground7is connected to a negative pole terminal of the battery device5, and a DC voltage, for which the battery device3, the battery device4, and the battery5are connected in series, is extracted to a positive pole1aof a first extraction terminal1. A first electric current2dis flowed from the ground7to a source terminal of the MOSFET9i, drain terminal of the MOSFET9i, a negative pole of the battery device5, a positive pole of the battery device5, a drain terminal of the MOSFET9c, a source terminal of the MOSFET9c, a source terminal of the MOSFET9h, a drain terminal of the MOSFET9h, a negative pole of the battery device4, a positive pole of the battery device4, a drain terminal of the MOSFET9b, a source terminal of the MOSFET9b, a source terminal of the MOSFET9g, a drain terminal of the MOSFET9g, a negative pole of the battery device3, a positive pole of the battery device3, a drain terminal of the MOSFET9a, a source terminal of the MOSFET9a, and the positive pole1aof the first extraction terminal1.

In this case, in the second switch circuit24, a MOSFET10band a MOSFET10care turned on, and the other MOSFETs are turned off, whereby a DC voltage, for which the battery device4and the battery device5are connected in series, is extracted to a positive pole2aof the second extraction terminal2. A second electric current26is flowed from the ground7to the source terminal of the MOSFET9i, the drain terminal of the MOSFET9i, the negative pole of the battery device5, the positive pole of the battery device5, a drain terminal of the MOSFET10c, a source terminal of the MOSFET10c, the negative pole of the battery device4, the positive pole of the battery device4, a source terminal of the MOSFET10b, a drain terminal of the MOSFET10b, and the positive pole2aof the second extraction terminal2.

In addition, in the second switch circuit24, as indicated inFIG. 24, a MOSFET10dis turned on, and the other MOSFETs are turned off, whereby a DC voltage of the battery device5can be extracted to the positive pole2aof the second extraction terminal2. The second electric current26is flowed from the ground7to the source terminal of the MOSFET9i, the drain terminal of the MOSFET9i, the negative pole of the battery device5, the positive pole of the battery device5, a source terminal of the MOSFET10dand a drain terminal of the MOSFET10d, and the positive pole2aof the second extraction terminal2. Moreover, in the first switch circuit9, the MOSFET9a, the MOSFET9c, the MOSFET9e, the MOSFET9g, and the MOSFET9iare turned on, and the other MOSFETs are turned off, whereby the ground7is connected to the negative pole of the battery device5, and a DC voltage, for which the battery device3and the battery device5are connected in series, is extracted to the positive pole1aof the first extraction terminal1.

The first electric current25is flowed from the ground7to the source terminal of the MOSFET9i, the drain terminal of the MOSFET9i, the negative pole of the battery device5, the positive pole of the battery device5, the drain terminal of the MOSFET9c, the source terminal of the MOSFET9c, the source terminal of the MOSFET9e, the drain terminal of the MOSFET9e, the source terminal of the MOSFET9g, the drain terminal of the MOSFET9g, the negative pole of the battery device3, the positive pole of the battery device3, the drain terminal of the MOSFET9a, the source terminal of the MOSFET9a, and the positive pole1aof the first extraction terminal1.

In this case, in the first switch circuit9, as indicated inFIG. 25, the MOSFET9a, the MOSFET9e, the MOSFET9f, the MOSFET9g, and the MOSFET9iare turned on, and the other MOSFETs are turned off, and the MOSFET23aand the MOSFET23bare turned on in the third switch circuit23, whereby the ground7is connected to the negative pole terminals of the battery device3and the battery device5, and the positive pole terminal of the battery device3is connected to the positive pole terminal of the battery device5.

As a result, a DC voltage, for which the battery device3and the battery device5are connected in parallel, is extracted to the positive pole1aof the first extraction terminal1, and an allowable electric current can be expanded in accordance with the parallel connection of the battery device3and the battery device5. One electric current of the first electric current25is flowed from the ground7to the source terminal of the MOSFET9f, the drain terminal of the MOSFET9f, the source terminal of the MOSFET9e,the drain terminal of the MOSFET9e, the source terminal of the MOSFET9g, the drain terminal of the MOSFET9g, the negative pole of the battery device3, the positive pole of the battery device3, the drain terminal of the MOSFET9a, the source terminal of the MOSFET9a, and the positive pole1aof the first extraction terminal1. The other electric current of the first electric current25is flowed from the ground7to the source terminal of the MOSFET9i, the drain terminal of the MOSFET9i, the negative pole of the battery device5, the positive pole of the battery device5, the drain terminal of the MOSFET23b, the source terminal of the MOSFET23b, the source terminal of the MOSFET23a, the drain terminal of the MOSFET23a,the drain terminal of the MOSFET9a, the source terminal of the MOSFET9a, and the positive pole1aof the first extraction terminal1.

Moreover, a DC voltage, for which the battery device3and the battery device5are connected in parallel, is extracted to the positive pole2aof the second extraction terminal2, and an allowable electric current can be expanded in accordance with the parallel connection of the battery device3and the battery device5. One electric current of the second electric current26is flowed from the ground7to the source terminal of the MOSFET9i, the drain terminal of the MOSFET9i, the negative pole of the battery device5, the positive pole of the battery device5, the source terminal of the MOSFET10d, the drain terminal of the MOSFET10d, and the positive pole2aof the second extraction terminal2. Although an electric current passage is not clearly indicated, the other electric current of the second electric current26is flowed from the ground7to the source terminal of the MOSFET9f, the drain terminal of the MOSFET9f, the source terminal of the MOSFET9e, the drain terminal of the MOSFET9e, the source terminal of the MOSFET9g, the drain terminal of the MOSFET9g, the negative pole of the battery device3, the positive pole of the battery device3, the drain terminal of the MOSFET23a, the source terminal of the MOSFET23a, the source terminal of the MOSFET23b, the drain terminal of the MOSFET23b,the source terminal of the MOSFET10d, the drain terminal of the MOSFET10d, and the positive pole2aof the second extraction terminal2. In addition, the charging device13, which is indicated in the power supply device inFIG. 16, is connected to the first extraction terminal1which is indicated in the power supply device inFIG. 22, whereby the battery device3, the battery device4, and battery device5can be charged. In particular, the positive pole of the charging device13is connected to the positive pole1aof the first extraction terminal1, and the negative pole of the charging device13is connected to the negative pole1bof the first extraction terminal1.

In this case, a plurality of battery devices are connected in series in Patent Document 1, so that an electric current, which can be supplied to a load, is limited to an allowable electric current of one battery device. Therefore, when a load state, in which a large electric current is required even at a low voltage, is caused, it is required that a battery device is added in parallel and an allowable electric current is increased, and there has been a problem in that a large size and a high cost of a power supply device are caused in accordance with the addition of the battery device. However, in the power supply device according to Embodiment 6, a DC voltage, for which a plurality of battery devices (in particular, the battery device3and battery device5) are connected in parallel, is extracted, and an allowable electric current can be expanded in accordance with a parallel connection of a plurality of battery devices (in particular, the battery device3and the battery device5). Therefore, a power supply device, by which an allowable output electric current can be expanded as necessary with a small size and a low cost, can be obtained. The above-described effect is similarly exercised even in the following Embodiment 7 through Embodiment 11.

A circuit diagram of a power supply device according to Embodiment 7 of the present invention is illustrated inFIG. 26. The power supply device according to Embodiment 7, in which a third switch circuit23is connected to a battery device3and a battery device4, is different from the power supply device according to Embodiment 6. In particular, in a MOSFET23aand a MOSFET23b, which are connected in reverse series, a drain terminal of the MOSFET23ais connected to a positive pole terminal of the battery device3, and a drain terminal of the MOSFET23bis connected to a positive pole terminal of the battery device4.

Hereinafter, an operation, in which a voltage is extracted from the battery device3, the battery device4, and a battery device5to a first extraction terminal1and a second extraction terminal2, will be explained. In a first switch circuit9, as indicated inFIG. 27, the MOSFET9a, a MOSFET9b, a MOSFET9f, a MOSFET9g, a MOSFET9h, and a MOSFET9iare turned on, and the other MOSFETs are turned off, and the MOSFET23aand the MOSFET23bare turned off in the third switch circuit23, whereby a ground7is connected to negative pole terminals of the battery device4and the battery device5, and a DC voltage, for which the battery device3and the battery device4are connected in series, is extracted to a positive pole1aof the first extraction terminal1. A first electric current25is flowed from the ground7to a source terminal of the MOSFET9f, a drain terminal of the MOSFET9f, a source terminal of the MOSFET9h, a drain terminal of the MOSFET9h, a negative pole of the battery device4, a positive pole of the battery device4, a drain terminal of the MOSFET9b, a source terminal of the MOSFET9b, a source terminal of the MOSFET9g, a drain terminal of the MOSFET9g, a negative pole of the battery device3, a positive pole of the battery device3, a drain terminal of the MOSFET9a, a source terminal of the MOSFET9a, and the positive pole1aof the first extraction terminal1.

In this case, in a second switch circuit24, a MOSFET10dis turned on, and the other MOSFETs are turned off, whereby a DC voltage of the battery device5is extracted to a positive pole2aof the second extraction terminal2. A second electric current26is flowed from the ground7to a source terminal of the MOSFET9i, a drain terminal of the MOSFET9i, a negative pole of the battery device5, a positive pole of the battery device5, a source terminal of the MOSFET10d, a drain terminal of the MOSFET10d, and the positive pole2aof the second extraction terminal2. In addition, a MOSFET10gis added in order to prevent a short circuit. For example, when the MOSFET10gis not included inFIG. 27, a voltage of the battery device5is applied to a drain terminal of a MOSFET10f, and a voltage, for which the battery device3, the battery device4, and battery device5are connected in series, is applied to a source terminal of the MOSFET10f.Thereby, a short circuit is caused. The short circuit is prevented by the MOSFET10g. A short circuit is similarly prevented by a MOSFET10hfor preventing a short circuit, which is described in the following description.

In this case, in a first switch circuit9, as indicated inFIG. 28, the MOSFET9a, and the MOSFET9e, the MOSFET9f, the MOSFET9g, the MOSFET9h, and the MOSFET9iare turned on, and the other MOSFETs are turned off, and the MOSFET23aand the MOSFET23bare turned on in the third switch circuit23, whereby the ground7is connected to the negative pole terminals of the battery device3and the battery device4, and the positive pole terminal of the battery device3is connected to the positive pole terminal of the battery device4.

As a result, a DC voltage, for which the battery device3and the battery device4are connected in parallel, is extracted to the positive pole1aof the first extraction terminal1. and an allowable electric current can be expanded in accordance with the parallel connection of the battery device3and the battery device4. One electric current of the first electric current25is flowed from the ground7to the source terminal of the MOSFET9f, the drain terminal of the MOSFET9f, the source terminal of the MOSFET9e,the drain terminal of the MOSFET9e, the source terminal of the MOSFET9g, the drain terminal of the MOSFET9g, the negative pole of the battery device3, the positive pole of the battery device3, the drain terminal of the MOSFET9a, the source terminal of the MOSFET9a, and the positive pole1aof the first extraction terminal1. The other electric current of the first electric current25is flowed from the ground7to the source terminal of the MOSFET9f, the drain terminal of the MOSFET9f, the source terminal of the MOSFET9h, the drain terminal of the MOSFET9h, the negative pole of the battery device4, the positive pole of the battery device4, the drain terminal of the MOSFET23b, the source terminal of the MOSFET23b, the source terminal of the MOSFET23a, the drain terminal of the MOSFET23a, the drain terminal of the MOSFET9a, the source terminal of the MOSFET9a, and the positive pole1aof the first extraction terminal1. Moreover, a DC voltage of the battery device5is extracted from the positive pole2aof the second extraction terminal2.

The second electric current26is flowed from the ground7to the source terminal of the MOSFET9i, the drain terminal of the MOSFET9i, the negative pole of the battery device5, the positive pole of the battery device5, the source terminal of the MOSFET10d, the drain terminal of the MOSFET10d, and the positive pole2aof the second extraction terminal2.

In addition, the charging device13, which is indicated in the power supply device inFIG. 16, is connected to the first extraction terminal1of the power supply device inFIG. 26, whereby the battery device3, the battery device4, and the battery device5can be charged. In particular, the positive pole of the charging device13is connected to the positive pole1aof the positive pole1aof the first extraction terminal1, and the negative pole of the charging device23is connected to the negative pole1bof the first extraction terminal1.

A circuit diagram of a power supply device according to Embodiment 8 of the present invention is illustrated inFIG. 29. The power supply device according to Embodiment 8, in which a third switch circuit23is connected to a battery device4and a battery device5, is different from the power supply device according to Embodiment 6. In particular, a drain terminal of the MOSFET23ais connected to a positive pole terminal of the battery device4, and a drain terminal of the MOSFET23bis connected to a positive pole terminal of the battery device5.

Hereinafter, an operation, in which a voltage is extracted from a battery device3, the battery device4, and the battery device5to a first extraction terminal1and a second extraction terminal2, will be explained. In a first switch circuit9, as indicated inFIG. 30, a MOSFET9a, a MOSFET9b, a MOSFET9f, a MOSFET9g, a MOSFET9h, and a MOSFET9iare turned on, and the other MOSFETs are turned off, and the MOSFET23aand the MOSFET23bare turned off in the third switch circuit23, whereby a ground7is connected to negative pole terminals of the battery device4and the battery device5, and a DC voltage, for which the battery device3and the battery device4are connected in series, is extracted to a positive pole1aof the first extraction terminal1. A first electric current25is flowed from the ground7to a source terminal of the MOSFET9f, a drain terminal of the MOSFET9f, a source terminal of the MOSFET9h, a drain terminal of MOSFET9h, a negative pole of the battery device4, a positive pole of the battery device4, a drain terminal of the MOSFET9b, a source terminal of the MOSFET9b, a source terminal of the MOSFET9g, a drain terminal of the MOSFET9g, a negative pole of the battery device3, a positive pole of the battery device3, a drain terminal of the MOSFET9a, a source terminal of the MOSFET9a, and the positive pole1aof the first extraction terminal1.

In this case, in a second switch circuit24, a MOSFET10dis turned on, and the other MOSFETs are turned off, whereby a DC voltage of the battery device5is extracted to a positive pole2aof the second extraction terminal2. A second electric current26is flowed from the ground7to a source terminal of the MOSFET9i, a drain terminal of the MOSFET9i, a negative pole of the battery device5, a positive pole of the battery device5, a source terminal of the MOSFET10d, a drain terminal of the MOSFET10dand the positive pole2aof the second extraction terminal2.

In this case, in the first switch circuit9, as indicated inFIG. 31, the MOSFET9b, the MOSFET9d, the MOSFET9f, the MOSFET9h, and the MOSFFT9iare turned on, and the other MOSFETs are turned off, and the MOSFET23aand the MOSFET23bare turned on in the third switch circuit23, whereby the ground7is connected to the negative pole terminals of the battery device4and the battery device5, and the positive pole terminal of the battery device4is connected to the positive pole terminal of the battery device5.

As a result, a DC voltage, for which the battery device4and the battery device5are connected in parallel, is extracted to the positive pole1aof the first extraction terminal1, and an allowable electric current can be expanded in accordance with the parallel connection of the battery device4and the battery device5. One electric current of the first electric current25is flowed from the ground7to the source terminal of the MOSFET9f, the drain terminal of the MOSFET9f, the source terminal of the MOSFET9h,the drain terminal of the MOSFET9h, the negative pole of the battery device4, the positive pole of the battery device4, the drain terminal of the MOSFET9b, the source terminal of the MOSFET9b, the source terminal of the MOSFET9d, the drain terminal of the MOSFET9d, and the positive pole1aof the first extraction terminal1. The other electric current of the first electric current25is flowed from the ground7to the source terminal of the MOSFET9i, the drain terminal of the MOSFET9i, the negative pole of the battery device5, the positive pole of the battery device5, the drain terminal of the MOSFET23b, the source terminal of the MOSFET23b, the source terminal of the MOSFET23a, the drain terminal of the MOSFET23a, the drain terminal of the MOSFET9b, the source terminal of the MOSFET9b,the source terminal of the MOSFET9d, the drain terminal of the MOSFET9d, and the positive pole1aof the first extraction terminal1. Moreover, a DC voltage, for which the battery device3and the battery device5are connected in parallel, is extracted to the positive pole2aof the second extraction terminal2, and an allowable electric current can be expanded in accordance with the parallel connection of the battery device3and the battery device5.

Moreover, a DC voltage, for which the battery device4and the battery device5are connected in parallel, is extracted to the positive pole2aof the second extraction terminal2, and an allowable electric current can be expanded in accordance with the parallel connection of the battery device4and the battery device5. One electric current of the second electric current26is flowed from the ground7to the source terminal of the MOSFET9i, the drain terminal of the MOSFFT9i, the negative pole of the battery device5, the positive pole of the battery device5, the source terminal of the MOSFET19d, the drain terminal of the MOSFET10d, and the positive pole2aof the second extract ion terminal2. Although an electric current passage is not clearly indicated, the other electric current of the second electric current26is flowed from the ground7to the source terminal of the MOSFET9f, the drain terminal of the MOSFET9f, the source terminal of the MOSFET9h, the drain terminal of the MOSFET9h, the negative pole of the battery device4, the positive pole of the battery device4, the drain terminal of the MOSFET23a, the source terminal of the MOSFET23a, the source terminal of the MOSFET23b, the drain terminal of the MOSFET23b, the source terminal of the MOSFET10d, the drain terminal of the MOSFET10d,and the positive pole2aof the second extraction terminal2.

A circuit diagram of a power supply device according to Embodiment 9 of the present invention is illustrated inFIG. 32. The power supply device according to Embodiment 9, in which a MOSFET10h, by which a short circuit is prevented, is added in a second switch circuit24, is different from the power supply device according to Embodiment 6. In particular, a drain terminal of the MOSFET10his connected to a drain terminal of the MOSFET10aand a positive pole terminal of a battery device4, and a source terminal of the MOSFET10his connected to source terminal of a MOSFET10b.

Hereinafter, an operation, in which a voltage is extracted from a battery device3, the battery device4, and a battery device5to a first extraction terminal1and a second extraction terminal2, will be explained. In a first switch circuit9, as indicated inFIG. 33, a MOSFET9b, a MOSFET9c, a MOSFET9d, a MOSFET9h, and a MOSFET9iare turned on, and the other MOSFETs are turned off, and a MOSFET23aand a MOSFET23bare turned off in a third switch circuit23, whereby a ground7is connected to a negative pole terminal of the battery device5, and a DC voltage, for which the battery device4and the battery device5are connected in series, is extracted to a positive pole1aof t first extraction terminal1. A first electric current25is flowed from the ground7to a source terminal of the MOSFET9i, a drain terminal of the MOSFET9i, a negative pole of the battery device5, a positive pole of the battery device5, a drain terminal of the MOSFET9c, a source terminal of the MOSFET9c, a source terminal of the MOSFET9h, a drain terminal of the MOSFET9h, a negative pole of the battery device4, a positive pole of the battery device4a drain terminal of the MOSFET9b, a source terminal of the MOSFET9b, a source terminal of the MOSFET9d, a drain terminal of the MOSFET9d, and the positive pole1aof the first extraction terminal1.

In this case, in the second switch circuit24, a MOSFET10dis turned on, and the other MOSFETs are turned off, whereby a DC voltage of the battery device5is extracted to a positive pole2aof the second extraction terminal2. A second electric current26is flowed from the ground7to a source terminal of the MOSFET9i, a drain terminal of the MOSFET9i, the negative pole of the battery device5, the positive pole of the battery device5, a source terminal of the MOSFET10da drain terminal of the MOSFET10d, and the positive pole2aof the second extraction terminal2.

In this case, in the first switch circuit9, as indicated inFIG. 34, the MOSFET9a, the MOSFET9e, the MOSFET9f, the MOSFET9g, and the MOSFET9iare turned on, and the other MOSFETs are turned off, and the MOSFET23aand the MOSFET23bare turned on in the third switch circuit23, whereby the ground7is connected to the negative pole terminals of the battery device3and the battery device5, and the positive pole terminal of the battery device3is connected to the positive pole terminal of the battery device5.

As a result, a DC voltage, for which the battery device2and the battery device5are connected in parallel, is extracted to the positive pole1aof the first extraction terminal1, and an allowable electric current can be expanded in accordance with the parallel connection of the battery device3and the battery device5. One electric current of the first electric current25is flowed from the ground7to the source terminal of the MOSFET9f, the drain terminal of the MOSFET9f, the source terminal of the MOSFET9e, the drain terminal of the MOSFET9e, the source terminal of the MOSFET9g, the drain terminal of the MOSFET9g, the negative pole of the battery device3, the positive pole of the battery device3, the drain terminal of the MOSFET9a, the source terminal of the MOSFET9a, and the positive pole1aof the first extraction terminal1. The other electric current of the first electric current25is flowed from the ground7to the source terminal of the MOSFET9i, the drain terminal of the MOSFET9i, the negative pole of the battery device5, the positive pole of the battery device5, the drain terminal of the MOSFET23b, the source terminal of the MOSFET23b, the source terminal of the MOSFET23a, the drain terminal of the MOSFET23a, the drain terminal of the MOSFET9a, the source terminal of the MOSFET9a, and the positive pole1aof the first extraction terminal1.

Moreover, a DC voltage, for which the battery device3and the battery device5are connected in parallel, is extracted to the positive pole2aof the second extraction terminal2, and an allowable electric current can be expanded in accordance with the parallel connection of the battery device3and the battery device5. One electric current of the second electric current26is flowed from the ground7to the source terminal of the MOSFET9i, the drain terminal of the MOSFET9i, the negative pole of the battery device5, the positive pole of the battery device5, the source terminal of the MOSFET10d, the drain terminal of the MOSFET10d, and the positive pole2aof the second extraction terminal2. Although an electric current passage is not clearly indicated, the other electric current of the second electric current26is flowed from the ground7to the source terminal of the MOSFET9f, the drain terminal of the MOSFET9f, the source terminal of the MOSFET9e, the drain terminal of the MOSFET9e, the source terminal of the MOSFET9g, the drain terminal of the MOSFET9g, the negative pole of the battery device3, the positive pole of the battery device3, the drain terminal of the MOSFET23a, the source terminal of the MOSFET23a, the source terminal of the MOSFET23b, the drain terminal of the MOSFET23b, the source terminal of the MOSFET10d, the drain terminal of the MOSFET10d, and the positive pole2aof the second extraction terminal2.

A circuit diagram of a power supply device according to Embodiment 10 of the present invention is illustrated inFIG. 35. The power supply device according to Embodiment 10, in which a MOSFET10his added in a second switch circuit24, is different from the power supply device according to Embodiment 7. In particular, a drain terminal of the MOSFET10his connected to a drain terminal of a MOSFET10aand a positive pole terminal of a battery device4, and a source terminal of the MOSFET10his connected to a source terminal of a MOSFET10b.

Hereinafter, an operation, in which a voltage is extracted from a battery device3, the battery device4, and a battery device5to a first extraction terminal1and a second extraction terminal2, will be explained. In a first switch circuit9, as indicated inFIG. 36, a MOSFET9b, a MOSFET9c, a MOSFET9d, a MOSFET9h, and a MOSFET9iare turned on, and the other MOSFETs are turned off, and a MOSFET23aand a MOSFET23bare turned off in a third switch circuit23, whereby a ground7is connected to a negative pole terminal of the battery device5, and a DC voltage, for which the battery device4and the battery device5are connected in series, is extracted to a positive pole1aof the first extraction terminal1. A first electric current25is flowed from the ground7to a source terminal of the MOSFET9i, a drain terminal of the MOSFET9i, a negative pole of the battery device5, a positive pole of the battery device5, a drain terminal of the MOSFET9c, a source terminal of the MOSFET9c, a source terminal of the MOSFET9h, a drain terminal of the MOSFET9h, a negative pole of the battery device4, a positive pole of the battery device4a drain terminal of the MOSFET9b, a source terminal of the MOSFET9b, a source terminal of the MOSFET9d, a drain terminal of the MOSFET9d, and the positive pole1aof the first extraction terminal1.

In this case, in the second switch circuit24, a MOSFET10dis turned on, and the other MOSFETs are turned off, whereby a DC voltage of the battery device5is extracted to a positive pole2aof the second extraction terminal2. A second electric current26is flowed from the ground7to a source terminal of the MOSFET9i, a drain terminal of the MOSFET9i, the negative pole of the battery device5, the positive pole of the battery device5, a source terminal of the MOSFET10d, a drain terminal of the MOSFET10d, and the positive pole2aof the second extraction terminal2.

In this case, in a first switch circuit9, as indicated inFIG. 37, the MOSFET9a, the MOSFET9e, the MOSFET9f, the MOSFET9g, the MOSFET9h, and the MOSFET9iare turned on, and the other MOSFETs are turned off, and the MOSFET23aand the MOSFET23bare turned on in the third switch circuit23, whereby the ground7is connected to the negative pole terminals of the battery device3, the battery device4, and the battery device5, and the positive pole terminal of the battery device3is connected to the positive pole terminal of the battery device4.

As a result, a DC voltage, for which, the battery device3and the battery device4are connected in parallel, is extracted to the positive pole1aof the first extraction terminal1, and an allowable electric current can be expanded in accordance with the parallel connection of the battery device3and the battery device4. One electric current of the first electric current25is flowed from the ground7to the source terminal of the MOSFET9f, the drain terminal of the MOSFET9f, the source terminal of the MOSFET9e,the drain terminal of the MOSFET9e, the source terminal of the MOSFET9g, the drain terminal of the MOSFET9g, the negative pole of the battery device3, the positive pole of the battery device3, the drain terminal of the MOSFET9a, the source terminal of the MOSFET9a, and the positive pole1aof the first extraction terminal1. The other electric current of the first electric current25is flowed from the ground7to the source terminal of the MOSFET9f, the drain germinal of the MOSFET9f, the source terminal of the MOSFET9h, the drain terminal of the MOSFET9h, the negative pole of the battery device4, the positive pole of the battery device4, the drain terminal of the MOSFET23b, the source terminal of the MOSFET23b, the source terminal of the MOSFET23a, the drain terminal of the MOSFET23a,the drain terminal of the MOSFET9a, the source terminal of the MOSFET9a, and the positive pole1aof the first extraction terminal1.

Moreover, a DC voltage of the battery device5extracted from the positive pole2aof the second extraction terminal2. The second electric current26is flowed from the ground7to the source terminal of the MOSFET9i, the drain terminal of the MOSFET9i, the negative pole of the battery device5, the positive pole of the battery device5, the source terminal of the MOSFET10d, the drain terminal of the MOSFET10d, and the positive pole2aof the second extraction terminal2.

A circuit diagram of a power supply device according to Embodiment 11 of the present invention is illustrated inFIG. 38. The power supply device according to Embodiment 11, in which a MOSFET10h, by which a short circuit is prevented, is added in a second switch circuit24, is different from the power supply device according to Embodiment 8. In particular, a drain terminal of the MOSFET10his connected to a drain terminal of the MOSFET10aand a positive pole terminal of a battery device4, and a source terminal of the MOSFET10his connected to a source terminal of a MOSFET10b.

Hereinafter, an operation, in which a voltage is extracted from a battery device3, the battery device4, and a battery device5to a first extraction terminal1and a second extraction terminal2, will be explained. In a first switch circuit9, as indicated inFIG. 39, a MOSFET9b, a MOSFET9c, a MOSFFT9d, a MOSFET9h, and a MOSFET9iare turned on, and the other MOSFETs are turned off, and a MOSFET23aand a MOSFET23bare turned off in a third switch circuit23, whereby a ground7is connected to a negative pole terminal of the battery device5, and a DC voltage, for which the battery device4and the battery device5are connected in series, is extracted to a positive pole1aof the first extraction terminal1. A first electric current25is flowed from the ground7to a source terminal of the MOSFET9i, a drain terminal of the MOSFET9i, a negative pole of the battery device5, a positive pole of the battery device5, a drain terminal of the MOSFET9c, a source terminal of the MOSFET9c, a source terminal of the MOSFET9h, a drain terminal of the MOSFET9h, a negative pole of the battery device4, a positive pole of the battery device4a drain terminal of the MOSFET9b, a source terminal of the MOSFET9b, a source terminal of the MOSFET9d, a drain terminal of the MOSFET9d, and the positive pole1aof the first extraction terminal1.

In this case, in the second switch circuit24, a MOSFET10dis turned on, and the other MOSFETs are turned off, whereby a DC voltage of the battery device5is extracted to a positive pole2aof the second extraction terminal2. A second electric current26is flowed from the ground7to a source terminal of the MOSFET9i, a drain terminal of the MOSFET9i, the negative pole of the battery device5, the positive pole of the battery device5, a source terminal of the MOSFET10d, a drain terminal of the MOSFET10d, and the positive pole2aof the second extraction terminal2.

In this case, in the first switch circuit9, as indicated inFIG. 40, the MOSFET9b, the MOSFET9d, the MOSFET9f, the MOSFET9h, and the MOSFET9iare turned on, and the other MOSFETs are turned off, and the MOSFET23aand the MOSFET23bare turned on in the third switch circuit23, whereby the ground7is connected to the negative pole terminals of the battery device4and the battery device5, and the positive pole terminal of the battery device4is connected to the positive pole terminal of the battery device5.

As a result, a DC voltage, for which the battery device4and the battery device5are connected in parallel, is extracted to the positive pole1aof the first extraction terminal1, and an allowable electric current can be expanded in accordance with the parallel connection of the battery device4and the battery device5. One electric current of the first electric current25is flowed from the ground7to the source terminal of the MOSFET9f, the drain terminal of the MOSFET9f, the source terminal of the MOSFET9h,the drain terminal of the MOSFET9h, the negative pole of the battery device4, the positive pole of the battery device4, the drain terminal of the MOSFET9b, the source terminal of the MOSFET9b, the source terminal of the MOSFET9d, the drain terminal of the MOSFET9d, and the positive pole1aof the first extraction terminal1. The other electric current of the first electric current25is flowed from the ground7to the source terminal of the MOSFET9i, the drain terminal of she MOSFET9i, the negative pole of the battery device5, the positive pole of the battery device5, the drain terminal of the MOSFET23b, the source terminal of the MOSFET23b, the source terminal of the MOSFET23a, the drain terminal of the MOSFET23a, the drain terminal of the MOSFET9b, the source terminal of the MOSFET9b,the source terminal of the MOSFET9d, the drain terminal of the MOSFET9d, and the positive pole1aof the first extraction terminal1.

Moreover, a DC voltage, for which the battery device4and the battery device5are connected in parallel, is extracted to the positive pole2aof the second extraction terminal2, and an allowable electric current can be expanded in accordance with the parallel connection of the battery device4and the battery device5. One electric current of the second electric current26is flowed from the ground7to the source terminal of the MOSFET9i, the drain terminal of the MOSFET9i, the negative pole of the battery device5, the positive pole of the battery device5, the source terminal of the MOSFET10d, the drain terminal of the MOSFET10d, and the positive pole2aof the second extraction terminal2. Although an electric current passage is not clearly indicated, the other electric current of the second electric current26is flowed from the ground7to the source terminal of the MOSFET9f, the drain terminal of the MOSFET9f, the source terminal of the MOSFET9h, the drain terminal of the MOSFET9h, the negative pole of the battery device4, the positive pole of the battery device4, the drain terminal of the MOSFET23a, the source terminal of the MOSFET23a, the source terminal of the MOSFET23b, the drain terminal of the MOSFET23b, the source terminal of the MOSFET10d, the drain terminal of the MOSFET10d,and the positive pole2aof the second extraction terminal2.

In addition, in Embodiment 6 through Embodiment 11 of the present invention, although the power supply device is explained by using a MOSFET (a field-effect transistor) as a switch, a similar effect is obtained even when a bipolar transistor, an insulation-type bipolar transistor (IGBT), a silicon carbide transistor, or a silicon carbide MOSFET is used. Moreover, although the second switch circuit and the third second switch circuit are explained by using MOSFETs which are connected in reverse series, it is needless to say that the other two-way characteristic switch can be used.

Moreover, the smoothing reactor11and the smoothing capacitor12, which are indicated inFIG. 8, can be added inFIG. 22,FIG. 26,FIG. 29,FIG. 32,FIG. 35, orFIG. 38. In particular, the smoothing reactor11is connected between a connection point of the source terminal of the MOSFET9aand the drain terminal of the MOSFET9dand the positive pole1aof the first extraction terminal1, and the smoothing capacitor12is connected between the positive pole1aof the first extraction terminal1and the negative pole1b. In addition, the smoothing reactor11may be provided at an electric current passage between a required battery device, which is connected to the negative pole1b, and the positive pole1aof the first extraction terminal1.

In addition, in the scope of the present invention, it is possible that each of embodiments is freely combined, or each of embodiments is suitably modified or omitted.

DESCRIPTION OF THE SYMBOLS