Electrical load status detection and control device

An electrical load status detection and control device includes a first power supply circuit loop with a first switch, a second power supply circuit loop with a second switch, a no-load status detection unit connected with the second power supply circuit loop for detecting the current passing through the second power supply circuit loop and thereby generating a current detection signal. A micro-controller connected with a reference current value database, the no-load status detection unit, the first switch and the second switch, which receives the current detection signal from the no-load status detection unit. The micro-controller generates a switching signal to actuate the first switch and the second switch to thereby open the first power supply circuit loop and the second power supply circuit loop when detecting the current passing through the second power supply circuit loop out of the reference current value range of the reference current value database.

FIELD OF THE INVENTION

The present invention relates to a power supply control device, and more particularly to an electrical load status detection and control device.

BACKGROUND OF THE INVENTION

Nowadays, the cost of energy generation rises higher and higher with the continuous increase of the international crude oil price. Thus, most people, governments, and environment protecting organization all over the world are advocating the policy of economizing on the use of energy. Especially, with the factors of warmer climate and denser population distribution, the total consumption of energy for both industrial and civil use has grown up day after day. Under this condition, to utilize energy in effective ways has become one of the most important problems to be solved right now.

Nevertheless, among all existed power supplying systems or devices, the phenomenon of electric leakage under the no-load situation exists almost unavoidably with the general ignorance of the public. The existence of electric leakage not only causes many meaningless waste of power but also cruelly causes many unpredictable numbers of casualties. Undoubtedly, above descriptions can be further verified by the statistics released from the official all over the world.

SUMMARY OF THE INVENTION

Among all the existing power supplying systems or devices, most of which are lacking of proper protecting device to effectively solve the problems of energy waste and safety use caused by the phenomenon of electric leakage under the no-load situation.

Accordingly, a primary object of the present invention is providing an electrical load status detection and control device. The device is provided with a no-load status detection unit, a load status detection unit, a micro-controller and at least one switch for controlling power supplying. Through the detections of the no-load status detection unit and the load status detection unit, and the verification of the controller, the device is served to control the close and open of the switch to further control whether power is supplying or not.

Additionally, a secondary object of the present invention is providing a device for automatically detecting and switching power supplying between loading status and no-load mode. The device is served to automatically interrupt the power supplying when it detects a no-load status to prevent people from electric shock.

To solve above problems, a mean in accordance with the present invention is to provide a device connects with a power supply source with a first power supply terminator and a second power supply terminator, and includes a first power supply circuit loop, a second power supply circuit loop, a no-load status detection unit, a load status detection unit, a micro-controller, a reference current value database, and a reference voltage value database.

The first power supply circuit loop and the second power supply circuit loop have a first switch and a second switch respectively. When the device is changed from connecting with an external load to removing the external load, the no-load status detection unit can detect a deviation of current to do a verifying action, in the micro-controller, with a reference current value provided by the reference current value database. If the value of the deviation of current reaches to the reference current value, the micro-controller generates a switching signal to synchronously actuate the first switch and the second switch to open situation to interrupt power supplying via the first power supply circuit loop and the second power supply circuit loop.

Contrarily, when the device is changed from without connecting any external load to connecting an external load, the load status detection unit can detect a deviation of voltage to do another verifying action, in the micro-controller, with a reference voltage value provided by the reference voltage value database. If the value of the deviation of voltage reaches to the reference voltage value, the micro-controller generates a switching signal to synchronously actuate the first switch and the second switch to close situation to supplying power via the first power supply circuit loop and the second power supply circuit loop.

Comparing with the conventional power supply control devices, through the control performance of the no-load status detection unit and the load status detection unit of the device here provided in accordance with the invention, the device not only effectively reduces the waste of power, but also further ensures the safety of electric use for the user.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The elements, circuits, devices, characteristics and the best embodiment of this invention are described with relative figures as follows.

Please refer toFIG. 1, which presents arrangement relation of a device in accordance with a best embodiment of the invention. An electrical load status detection and control device100for automatically detecting and switching power supplying between a loading status and a no-load status is connected with a power supply source1and provided with a first power supply terminator11and a second power supply terminator12. The electrical load status detection and control device100includes a first power supply circuit loop2, a second power supply circuit loop3, a no-load status detection unit4, a load status detection unit5, a micro-controller6, a reference current value database7, and a reference voltage value database8.

The first power supply circuit loop2includes a first node21, a first switch22, a second node23, and a first power output terminator24, and sequentially connects the first power supply terminator11, the first node21, the first switch22, the second node23, and the first power output terminator24.

The second power supply circuit loop3includes a third node31, a second switch32, a fourth node33, and a second power output terminator34, and sequentially connects the third node31, the second switch32, the fourth node33, and the second power output terminator34.

The no-load status detection unit4includes a no-load status detection impedance41and a current detection circuit42. The no-load status detection impedance41connects with the third node31and the second power supply terminator12. The current detection circuit42connects with the third node31, the second power supply terminator12, and the micro-controller6.

The load status detection unit5includes a first load status detection impedance51, a second load status detection impedance52, a third load status detection impedance53and a load voltage detection circuit54. The first load status detection impedance51connects with the first node21and the second node23. The second load status detection impedance52connects with the second node23and the fourth node33. The third load status detection impedance53connects with the third node31and the fourth node33. The load voltage detection circuit54connects with the second node23, the fourth node33and the micro-controller6.

The micro-controller6connects with the current detection circuit42of the no-load status detection unit4, the load voltage detection circuit54of the load status detection unit5, the first switch22, the second switch32, the reference current value database7and the reference voltage value database8.

Please refer toFIG. 2, showing circuit arrangement of another device in accordance with a preferred application of the best embodiment of the invention. Another electrical load status detection and control device100afor automatically detecting and switching power supplying between a loading status and a no-load status is also connected with a power supply source1. The difference between the electrical load status detection and control device100and100ais that the no-load status detection unit4and the load status detection unit5are respectively replaced by another no-load status detection unit4aand load status detection unit5a.

Meanwhile, the no-load status detection impedance41and the current detection circuit42of the no-load status detection unit4are respectively replaced by a resistance41awith low resistance, and a current detection signal amplifier42aof the no-load status detection unit4a. The first load status detection impedance51, the second load status detection impedance52and the third load status detection impedance53of the load status detection unit5are replaced by three resistances51a,52aand53aof the load status detection unit5awith high resistances. Hereafter, we will provide further description of the relation of automatically detecting and switching power supplying between a loading status and a no-load status via the drawing.

When an external loading9connects with the first power supply output terminator24and the second power supply output terminator34in a loading status, the first switch22and the second switch32are close. Due to the resistances51a,52aand53awith high resistances and the resistance41aare provided with low resistance, most current sequentially passes from the first power supply terminator11, through the first node21, the first switch22, the second node23, the first power output terminator24, the external loading9, the second power output terminator34, the fourth node33, the second switch32, the third node31and the resistance41a, to the second power supply terminator12.

The current detection signal amplifier42acan detect a current value passing through the resistance41a, transfer the current value to a current detection signal S1carried with the current value, and send the current detection signal S1to the micro-controller6. In the micro-controller6, the current value carried by the current detection signal S1is compared with a reference current value range provided by the reference current value database7. Due to the current value is within the reference current value range, the micro-controller6can verify it as a loading status and keep the electrical load status detection and control device100ain an original power supply situation.

When the external loading9is removed from the first power supply output terminator24and the second power supply output terminator34, or the external loading9is removed from either one of the first power supply output terminator24and the second power supply output terminator34, an open-circuit situation is presented between the first power supply output terminator24and the second power supply output terminator34. At the same time, most current sequentially passes from the first power supply terminator11, through the first node21, the first switch22, the second node23, the fourth node33, the second switch32, the third node31and the resistance41a, to the second power supply terminator12.

Due to the resistance52aare provided with high resistance, another current value passes through the resistance41adetected by the current detection signal amplifier42adrops down obviously. In the micro-controller6, the current value carried by the current detection signal S1is compared with a reference current value range provided by the reference current value database7. Due to the current value is dropped down obviously and out of the reference current value range, the micro-controller6can verify it as a no-load status and send a switching signal S2to the first switch22and the second switch32. Then the first switch22and the second switch32are switched to open the first power supply circuit loop2and the second power supply circuit loop3to interrupt power supplying and enter to the no-load mode.

Hereafter, we further disclose how the first switch22and the second switch32can be switched to turn off the first power supply circuit loop2and the second power supply circuit loop3to go back to the original power supply situation.

Follow up to the no-load status with the first switch22and the second switch32switched to turn off the first power supply circuit loop2and the second power supply circuit loop3as described as above, meanwhile, most current sequentially passes from the first power supply terminator11, through the first node21, the resistance51a, the second node23, the resistance52a, the fourth node33, the resistance53a, the third node31and the resistance41a, to the second power supply terminator12. Due to the voltage between first power supply terminator11and the second power supply terminator12is almost keeping in a constant, the total resistance of the current passing circuit is relatively large, the current can obviously drop down to decrease the power loss.

Due to the resistances51a,52aand53aare provided with high resistance, the load voltage detection circuit54can detect a voltage value between the second node23and the fourth node33, transfer the voltage value to a voltage detection signal S3carried with the voltage value, and send the voltage detection signal S3to the micro-controller6. In the micro-controller6, the voltage value carried by the voltage detection signal S1is compared with a reference voltage value range provided by the reference voltage value database8. Due to the voltage value is within the reference voltage value range, the micro-controller6can verify it as a no-load status and keep the electrical load status detection and control device100ain an interrupting power supply situation.

When the external loading9connects the electrical load status detection and control device100a, the equivalent resistance between the second node23and the fourth node33drops down. Thus, another voltage value between the second node23and the fourth node33detected by the current detection signal amplifier42adrops down obviously. In the micro-controller6, the voltage value carried by the voltage detection signal S3is compared with the reference voltage value range provided by the reference voltage value database8. Due to the voltage value is dropped down obviously and out of the reference voltage value range, the micro-controller6can verify it as a loading status and send a switching signal S2to the first switch22and the second switch32. Then the first switch22and the second switch32are switched to close the first power supply circuit loop2and the second power supply circuit loop3to go on supplying power and go back to the loading status.

The load voltage detection circuit54may be composed of a voltage detection signal amplifier, a voltage detection signal rectifier, and a voltage detection signal filter.

Through the load voltage detection circuit54, the voltage between the second node23and the fourth node33can be detected and sequentially do a series of treatments of amplifying, rectifying and filtering to generate the voltage detection signal S3sending to the micro-controller6.

To make a summary, the device for automatically detecting and switching power supplying between a loading status and a no-load status in accordance with the present invention not only has solved the existed problems effectively but also brings novel, practicable and progressive value meeting the essence of patent to be applied for.