Physiological signal detection device

A physiological signal detection device has a battery disposed in the physiological signal detection device, a first input terminal, a second input terminal, and a charging detection terminal A physiological signal detection circuit generates a physiological signal according to a detection result of the first input terminal and the second input terminal A charging control circuit is electrically coupled to the first input terminal, the second input terminal and the charging detection terminal, wherein, when the first input terminal and the second input terminal are coupled to a power supply supplied by a charging device, the charging detection terminal receives a charging indication signal of the charging device and according to the charging indication signal the charging device is enabled so as to charge the battery with the power supply.

CROSS REFERENCE TO RELATED APPLICATIONS

This Application claims priority of Taiwan Patent Application No. 101137215 filed on Oct. 9, 2012, the entirety of which is incorporated by reference herein.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a signal detection device, and in particular, relates to a physiological signal detection device.

2. Description of the Related Art

Healthcare for the elderly, long-distanced healthcare and personal healthcare have attracted great attention recently. Therefore, portable electronic products have been developed for monitoring the health of people. Design of these electronic products emphasizes the characteristics of portability, power-saving, and low price. Also, these electronic products have the capability of tracking physiological signals, such as temperature, electrocardiogram, and pulse information of users, to effectively record the physiology of the users. Thus, a physiological signal detection device that is easy to operate, has a compact structure, and is convenient for charging and storing is in need.

BRIEF SUMMARY OF THE INVENTION

A physiological signal detection device comprises a battery disposed in the physiological signal detection device, comprising a positive terminal and a negative terminal, a first input terminal, a second input terminal, and a charging detection terminal. A physiological signal detection circuit is electrically coupled to the first input terminal and the second input terminal, wherein, when the first input terminal and the second input terminal are electrically connected to a measure target, the physiological signal detection circuit generates a physiological signal according to a detection result of the first input terminal and the second input terminal A charging control circuit is electrically coupled to the first input terminal, the second input terminal and the charging detection terminal, wherein, when the first input terminal and the second input terminal are coupled to a power supply supplied by a charging device, the charging detection terminal receives a charging indication signal of the charging device and according to the charging indication signal the charging device is enabled so as to charge the battery with the power supply.

The invention further discloses a charging device, wherein the charging device comprises a first output terminal, a charging indication terminal, and a second output terminal, respectively, coupled to the first input terminal, the charging detection terminal and the second input terminal A charging circuit is coupled to the first terminal, the second terminal and the third terminal so as to supply the power supply and the charging indication signal.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1is a schematic diagram for illustrating a physiological signal detection device200and a charging device100according to an embodiment of the invention. In the embodiment of the invention, the physiological signal detection device200is an electrocardiogram measure device and is portable by using a magnet to fix the physiological signal detection device200to the clothes of a user. The physiological signal detection device200has three terminals to connect with outer connection terminals. The three terminals are a first input terminal Pr2, a second input terminal Pl2and a charging detection terminal Pc2. The feature of the invention is that the first input terminal Pr2and the second input terminal Pl2are not only the input terminals of an electro-cardio signal of a human body under a measuring operation mode, but also the input terminals for receiving a power supply of the charging device100in conjunction with the charging detection terminal Pc2under a charging mode.

When the physiological signal detection device200connects to the charging device100, the first input terminal Pr2, the charging detection terminal Pc2and the second input terminal Pl2are connected to a first output terminal Pr1, a charging indication terminal Pc1and a second output terminal Pl1of the charging device100, respectively. The physiological signal detection device200receives the power supply of a charging circuit110by the first input terminal Pr2and the second input terminal Pl2and receives a charging indication signal Vt by the charging detection terminal Pc2.

Referring toFIG. 1, the physiological signal detection device200has a charging detection circuit240coupled to the charging detection terminal Pc2so as to detect the voltage of the charging detection terminal Pc2, determine the charging indication signal Vt and further output a corresponding detection signal to control an operation mode of the physiological signal detection device200. For example, the charging detection circuit240is composed of a comparator210, a resistor R1and a resistor R2. When the voltage of the charging detection terminal Pc2is lager than a reference voltage Vref, the charging detection circuit240outputs a corresponding first detection signal to a node No so as to correspondingly indicate the physiological signal detection device200under a charging/storage mode. When the voltage of the charging detection terminal Pc2is not lager than the reference voltage Vref, the charging detection circuit240outputs a corresponding second detection signal to the node No so as to correspondingly indicate the physiological signal detection device200under a measuring operation mode.

The physiological signal detection device200has a physiological signal detection circuit220that is electrically connected to the first input terminal Pr2and the second input terminal Pl2. The physiological signal detection circuit220is driven by the power supply Vcc_ECG, receiving, and processing the input signals of the first input terminal Pr2and the second input terminal Pl2, such as the signal of bioelectricity, and transforming the input signals into a physiological signal Sd as an output.

The physiological signal detection device200has a microprocessor unit230coupled to the physiological signal detection circuit220and the node No. The microprocessor unit230is driven by a power supply Vcc. When receiving the second detection signal from the node No, the microprocessor unit230receives, and processes the physiological signal Sd from the physiological signal detection circuit220and calculates a plurality of a physiological information St according to the physiological signal Sd. In some embodiments, the physiological information may include a heart rate, calorie consumption, an electrocardiogram, and an exercise time. The physiological signal detection device200further has a wireless communication device280so as to transmit the physiological information St to a personal computer, a cloud storage and a portable device for storing and displaying.

The physiological signal detection device200has a battery BAT and a charging control circuit250. The battery BAT has a positive terminal and a negative terminal and is disposed inside the physiological signal detection device200to provide the power supply to inner circuits of the physiological signal detection device200. The charging control circuit250has a power input terminal Vin and a control terminal EN coupled to the first input terminal Pr2and the node No, respectively. When the control terminal EN receives the first detection signal from the node No (i.e., under the charging/storage mode), the charging control circuit250is enabled and processes a power supply input from the first input terminal Pr2via the input terminal Vin and provides the processed power to the positive terminal of the battery BAT. When the node No outputs the second detection signal (i.e., under the measuring operation mode), the charging control circuit250is disabled, cuts off the connection between the power input terminal Vin and the battery BAT and stops charging the battery BAT. The physiological signal detection device200further has a transistor M1, wherein the drain electrode of the transistor M1is coupled to the second input terminal Pl2, the gate electrode of the transistor M1is coupled to the first input terminal Pr2, and the source electrode and body electrode of the transistor M1are connected to the negative terminal of the battery BAT and a ground via a reference voltage node GND. The battery BAT is charged via the first input terminal Pr2and the second input terminal Pl2. The physiological signal detection device200further has a capacitor C1coupled between the power input terminal Vin and the control terminal EN and a diode D2coupled between the node No and the control terminal EN.

The physiological signal detection device200has a DC-DC converter circuit260and switches SW1, SW2. The DC-DC converter circuit260is coupled to the battery BAT and transforms the voltage supplied from the battery BAT into power supplies for circuits, wherein the power supplies provided to the microprocessor unit230, the physiological signal detection circuit220and the wireless communication device280are Vcc, Vcc_ECG and Vcc_BT, respectively. Two terminals of the switch SW1are respectively connected to the physiological signal detection circuit220and the terminal of the power supply Vcc_ECG outputted from the DC-DC converter circuit260. The control terminal of the switch SW1is connected to the microprocessor unit230and when the microprocessor unit230receives the second detection signal from the node No (i.e., under the measuring operation mode), the microprocessor unit230correspondingly generates a control signal So that has a first voltage level and turns on the switch SW1to provide the power supply Vcc_ECG to the physiological signal detection circuit220. When the microprocessor unit230receives the first detection signal from the node No (i.e., under the charging/storage mode), the microprocessor unit230correspondingly generates the control signal So that has a second voltage level and turns off the switch SW1so that the power supply Vcc_ECG does not be provided to the physiological signal detection circuit220. Two terminals of the switch SW2are respectively connected to the wireless communication device280and the terminal of a power supply Vcc_BT outputted from the DC-DC converter circuit260. The control terminal of the switch SW2is connected to the microprocessor unit230and when the microprocessor unit230receives the second detection signal from the node No (i.e., under the measuring operation mode), the microprocessor unit230correspondingly generates a control signal So that has the first voltage level and turns on the switch SW2to provide the power supply Vcc_BT to the wireless communication device280. When the microprocessor unit230receives the first detection signal from the node No (i.e., under the charging/storage mode), the microprocessor unit230correspondingly generates the control signal So that has the second voltage level and turns off the switch SW2so that the power supply Vcc_BT does not be supplied to the wireless communication device280.

The physiological signal detection device200has a start unit270and is coupled to the microprocessor unit230so as to generate a start instruction Vo. When the start instruction Vo is transmitted to the microprocessor unit230, the physiological signal detection device200operates in the measuring operation mode. The microprocessor unit230further turns on the switch SW1and/or SW2so that the battery BAT provides the power supply to the physiological signal detection circuit220and/or the wireless communication device280to start the physiological signal detection device200to detect the signal of bioelectricity. In one embodiment, the start unit270can be a Hall sensor. When the physiological signal detection device200is combined with a magnet on a user, the Hall sensor transmits the start instruction Vo due to the variations of the magnetic field so that the physiological signal detection circuit220of the physiological signal detection device200performs measuring.

The charging device100can be used with the physiological signal detection device200so as to charge the physiological signal detection device200. The charging device100has three terminals: a first output terminal Pr1, a second output terminal Pl1and a charging indication terminal Pc1that corresponds to the first input terminal Pr2, the second input terminal Pl2and the charging detection terminal Pc2of the physiological signal detection device200. When the charging device100is combined with the physiological signal detection device200, the charging device100inputs a voltage Vc to the first input terminal Pr2via the first output terminal Pr1, inputting a voltage Vt (the charging indication signal) to the charging detection terminal Pc2via the charging indication terminal Pc1, and connecting the second input terminal Pl2with the reference voltage node GND via the second output terminal Pl1. The charging device100further has a diode D1that is coupled between the first output terminal Pr1and the output terminal of the voltage Vt, a resistor R4that is coupled between the output terminal of the voltage Vt and the charging indication terminal Pc1, and a resistor R3that is coupled between the output terminal of the voltage Vt and the second output terminal Pl1.

FIG. 2is a circuit diagram for illustrating the embodiment, when the physiological signal detection device200is operating in the measuring operation mode ofFIG. 1. The first input terminal Pr2and the second input terminal Pl2are respectively connected to connection pads P1and P2and the connection pads P1and P2are respectively connected to two terminal of a measure target T0, such as a human body, wherein the charging detection terminal Pc2is floating. When the voltage level of the charging detection terminal Pc2is a first state (i.e. 2.6V), after the comparator210compares the voltage level of the charging detection terminal Pc2with the reference voltage Vref (i.e. 2.8V), the charging detection circuit240outputs a corresponding second detection signal Vb to the node No so as to correspondingly indicate the physiological signal detection device200operating in the measuring operation mode.

When the microprocessor unit230receives the second detection signal Vb from the node No, the microprocessor unit230correspondingly generates the control signal So that has the first voltage level so as to turn on the switch SW2to provide the power supply Vcc_BT to the wireless communication device280and turn on the switch SW1to provide the power supply Vcc_ECG to the physiological signal detection circuit220.

When the user starts to perform measuring, the start unit270generates the start instruction Vo to the microprocessor unit230so that the physiological signal detection device200performs detecting. The physiological signal detection circuit220of the physiological signal detection device200measures the signal of bioelectricity of the target T0, such as the electro-cardio signal, via connection pads P1and P2and transforms the measure results into the physiological signal Sd.

When the second detection signal Vb from the node No is received, the microprocessor unit230receives and processes the physiological signal Sd from the physiological signal detection circuit220for calculating the physiological information St according to the physiological signal Sd. The physiological information St is uploaded to the personal computer, the cloud storage and the portable device for storing and displaying.

Due to the second detection signal Vb outputted from the node No, the charging control circuit250is disabled so as to cut off the connections between the power input terminal Vin and the battery BAT to stop charging the battery BAT. Because the transistor M1operates in the turn-off state, the second input terminal Pl2is electrically isolated from the negative terminal of the battery BAT.

FIG. 3is a circuit diagram for illustrating the embodiment, when the physiological signal detection device200is operating in the charging mode ofFIG. 1. The charging device100is connected with the physiological signal detection device200and the first output terminal Pr1, the second output terminal Pl1and the charging indication terminal Pc1are electrically connected to the first input terminal Pr2, the second input terminal Pl2and the charging detection terminal Pc2. Because the charging indication terminal Pc1inputs the charging indication signal Vt to the charging detection terminal Pc2, the voltage level of the charging detection terminal Pc2is a second state (i.e. 3.0V). After the comparator210compares the voltage level of the charging detection terminal Pc2with the reference voltage Vref (i.e. 2.8V), the charging detection circuit240outputs a corresponding first detection signal Va to the node No so as to correspondingly indicate the physiological signal detection device200operating in the charging/storage mode.

When the microprocessor unit230receives the first detection signal Va from the node No, the microprocessor unit230correspondingly generates a control signal So having the second voltage level so as to turn off the switch SW2so that the power supply Vcc_BT does not be supplied to the wireless communication device280and turn off the switch SW1so that the power supply Vcc_ECG does not be supplied to the physiological signal detection circuit220. Under the charging mode, both of the wireless communication device280and the physiological signal detection circuit220stop working.

According to the first detection signal Va outputted from the node No, the charging control circuit250processes the power supply of the input terminal Vin and then provides the processed power supply to the battery BAT so that the charging device100inputs the voltage Vc to charge the battery BAT via the first output terminal Pr1and the first input terminal Pr2. At the same time, because the transistor operates in the turn-on state, the second input terminal Pl2is electrically connected to the negative terminal of the battery BAT and the ground. Therefore, the charging device100and the battery BAT form a loop to perform charging.

FIG. 4is a circuit diagram for illustrating the embodiment, when the physiological signal detection device200is operating in the storage mode ofFIG. 1. Under the storage mode, the charging device100is connected with the physiological signal detection device200, and the first output terminal Pr1, the second output terminal Pl1and the charging indication terminal Pc1are electrically connected to the first input terminal Pr2, the second input terminal Pl2and the charging detection terminal Pc2of the physiological signal detection device200. At this time, for instance, the charging device100is not connected to the power supply or disabled, so the charging device100does not supply the voltage Vc and the charging indication signal Vt to the physiological signal detection device200. However, the battery BAT of the physiological signal detection device200still keeps providing the power supply Vcc, so the loop composed of resistors R3and R4and the charging detection circuit240makes the voltage of the charging detection terminal Pc2be a third state (i.e. 2.2V). After the comparator210compares the voltage level of the charging detection terminal Pc2with the reference voltage Vref (i.e. 2.8V), the charging detection circuit240still outputs a first detection signal Va to the node No so as to correspondingly indicate the physiological signal detection device200operating in the charging/storage mode.

When the microprocessor unit230receives the first detection signal Va from the node No, the microprocessor unit230correspondingly generates a control signal So having the second voltage level so as to turn off the switch SW2so that the power supply Vcc_BT does not be supplied to the wireless communication device280and turn off the switch SW1so that the power supply Vcc_ECG does not be supplied to the physiological signal detection circuit220. Under the storage mode, both of the wireless communication device280and the physiological signal detection circuit220stop working.

The charging circuit110does not provide the voltage Vc, so the charging device100is barely used to load the physiological signal detection device200for storage.

In the invention, the physiological signal detection device200collocates with the charging device100, so that the same terminals are used for charging and measuring. The collocation simplifies the use of the physiological signal detection device200, reduces volume and has the characteristic of storage.