WO2018152842A1

WO2018152842A1 - Skin detector and skin detection system

Info

Publication number: WO2018152842A1
Application number: PCT/CN2017/075031
Authority: WO
Inventors: 何江波
Original assignee: 深圳和而泰家居在线网络科技有限公司
Priority date: 2017-02-27
Filing date: 2017-02-27
Publication date: 2018-08-30
Also published as: CN108366738B; CN108366738A

Abstract

A skin detector, comprising a communication port (100), an electrical load (200), and a communication interface power circuit (300). The communication port (100) is used for connecting a communication interface of an external intelligent terminal. The communication interface power circuit (300) is separately connected to the communication port (100) and the electrical load (200), and is used for receiving, by means of the communication port (100), a sine wave alternating current signal of a preset frequency generated by the external intelligent terminal, and converting the sine wave alternating current signal into a direct current supply voltage required by the electrical load. A skin detection system, comprising the intelligent terminal and the skin detector. By means of the skin detector and the skin detection system, the power supply stability and the portability of the skin detector are improved costs of the skin detector are reduced, and the appearance of the skin detector is improved.

Description

Skin tester and skin detection system

Technical field

Embodiments of the present invention relate to the field of human skin testing technology, and in particular, to a skin detector and a skin detecting system.

Background technique

With the development of science and technology, people are more and more concerned about health and beauty, and the detection of the body is particularly important. In the study of body composition, measuring the bioelectrical impedance value of the human body can obtain information about the health status of the human body such as moisture and fat. The monitoring of human health and the early diagnosis of diseases are of great significance, so more and more skin test products have emerged. The existing skin test products are powered by batteries, and all batteries must be added for normal use. Because the battery voltage is unstable, the battery needs to be replaced or the battery needs to be charged after use, which affects the performance and convenience of the product, and the battery is added. The limitations imposed by the product structure affect the appearance and cost.

Summary of the invention

The technical problem mainly solved by the embodiments of the present invention is to provide a skin detecting instrument and a skin detecting system, which can improve the stability of the power supply of the skin detecting device and the convenience of use, reduce the cost of the skin detecting device, and enhance the appearance of the skin detecting device.

In order to solve the above technical problem, a technical solution adopted by the embodiment of the present invention is to provide a skin detector. The skin detector includes a communication port for connecting to a communication interface of an external intelligent terminal, and a communication port for: the skin detector further includes: a communication interface power taking circuit, respectively, and the communication port and the power source And a load connection, configured to receive, by the communication port, a sine wave AC signal of a preset frequency generated by the external smart terminal, and convert the sine wave AC signal into a DC power supply voltage required by the power load.

Optionally, the frequency of the sine wave AC signal is 22 KHz.

Optionally, the communication interface power take-off circuit includes: a voltage conversion module connected to the communication port, and the voltage conversion module is configured to receive, by the communication port, a sine of a preset frequency generated by the external smart terminal Wave AC signal, and converting the sine wave AC signal to meet the use a DC voltage signal required for electrical load power supply; a voltage stabilizing module respectively connected to the voltage conversion module and the power load, and the voltage regulator module is configured to voltage the DC voltage signal, and output the The DC supply voltage required for the electrical load.

Optionally, the voltage conversion module includes at least two boosting units, wherein the at least two boosting units are configured to boost the sinusoidal alternating current signal, and convert the sinusoidal alternating current signal to meet the use The DC voltage signal required for electrical load supply.

Optionally, the at least two boosting units include: a first boosting unit connected to the communication port, configured to boost the sine wave AC signal, and output a first boosting signal; And a voltage unit, which is respectively connected to the communication port and the first boosting unit, for boosting a voltage signal superimposed by the sine wave AC signal and the first boost signal, and outputting a second liter And a third boosting unit connected to the communication port and the second boosting unit, respectively, for boosting a voltage signal superposed by the sine wave AC signal and the second boost signal And outputting a third boosting signal; the fourth boosting unit is respectively connected to the communication port, the third boosting unit, and the voltage stabilizing circuit, for the sinusoidal alternating current signal and the third liter The voltage signal superimposed by the voltage signal is boosted, and the DC voltage signal is output to the voltage stabilizing circuit.

Optionally, the first boosting unit includes a first dual Schottky diode, a first capacitor and a second capacitor; and the second boosting unit includes a second dual Schottky diode, a third capacitor, and a fourth Capacitor; the third boosting unit includes a third dual Schottky diode, a fifth capacitor, and a sixth capacitor; the fourth boosting unit includes a fourth dual Schottky diode, a seventh capacitor, and a eighth capacitor; a common pole of the first dual Schottky diode is connected to the communication port via the first capacitor, an anode of the first dual Schottky diode is grounded, and a cathode of the first dual Schottky diode An anode of the second dual Schottky diode is connected and grounded via the second capacitor; a common pole of the second dual Schottky diode is connected to the communication port via the third capacitor, the a cathode of the double-double Schottky diode is connected to an anode of the third dual Schottky diode and grounded via the fourth capacitor; a common pole of the third dual Schottky diode is via the fifth capacitor The communication port is connected, the third pair a cathode of the special diode is connected to an anode of the fourth dual Schottky diode and is grounded via the sixth capacitor; a common pole of the fourth dual Schottky diode communicates with the communication via the seventh capacitor A port is connected, a cathode of the fourth dual Schottky diode is connected to the voltage stabilizing module, and is grounded via the eighth capacitor.

Optionally, the voltage stabilizing module includes a voltage stabilizing chip and a power output end; an input pin of the voltage stabilizing chip and an enable pin of the voltage stabilizing chip are connected to the voltage converting module, and the voltage stabilizing chip Ground The foot is grounded, and an output pin of the voltage stabilizing chip is connected to the power output end.

Optionally, the voltage stabilizing module further includes a ninth capacitor and a tenth capacitor; one end of the ninth capacitor is connected to the voltage conversion module, and respectively connected to an input pin of the voltage regulator chip and the voltage regulator The enable pin of the chip is connected, the other end of the ninth capacitor is grounded; one end of the tenth capacitor is connected to an output pin of the voltage stabilizing chip, and is connected to the power output end, the tenth capacitor The other end is grounded.

Optionally, the communication interface power take-off circuit further includes a signal isolation module, and the signal isolation module is connected to the communication port for isolating the ground signal of the skin detector and the external intelligent terminal.

Optionally, the signal isolation module includes a first diode and a second diode; a cathode of the first diode and a cathode of the second diode are both connected to the communication port, The anode of the first diode and the anode of the second diode are both grounded.

In order to solve the above technical problem, another technical solution adopted by the embodiment of the present invention is to provide a skin detecting system including an intelligent terminal and the above-mentioned skin detecting device; a communication interface of the smart terminal and the skin a communication port of the detector is connected, the smart terminal generates a sine wave AC signal of a preset frequency when connected with the skin detector, and outputs the sine wave AC signal through the communication interface; the skin detector The communication interface power take-off circuit receives the sine wave AC signal through the communication port and converts the sine wave AC signal into a DC power supply voltage required for the electrical load of the skin tester.

The sine wave AC signal of the preset frequency output by the communication interface of the external intelligent terminal is received by the communication interface power take-off circuit through the communication interface power take-off circuit, and the sine wave is obtained. The AC signal is converted into the DC supply voltage required for the electric load, so that the stable DC supply voltage is output to the electric load, so that the skin detector does not need to be equipped with a battery, which improves the stability of the skin detector and the convenience of use. Sexuality, but also reduces the cost of the skin tester and enhances the appearance of the skin tester.

DRAWINGS

The one or more embodiments are exemplified by the accompanying drawings in the accompanying drawings. The figures in the drawings do not constitute a scale limitation unless otherwise stated.

1 is a circuit diagram of an embodiment of a skin detector of the present invention;

2 is a circuit diagram of another embodiment of the skin tester of the present invention;

Fig. 3 is a circuit diagram showing still another embodiment of the skin tester of the present invention.

detailed description

Referring to FIG. 1 , a skin detector provided by an embodiment of the present invention includes a communication port 100 , an electrical load 200 , and a communication interface power take-off circuit 300 .

The communication port 100 is used for connecting to a communication interface of an external intelligent terminal. The communication interface power take-off circuit 300 is respectively connected to the communication port 100 and the power load 200. The communication interface power take-off circuit 300 is used to pass the communication port 100. Receiving a sine wave AC signal of a preset frequency generated by the external smart terminal, and converting the sine wave AC signal into a DC power supply voltage required by the power load 200.

It should be noted that the external intelligent terminal connected to the skin detector may be a device capable of communicating with the skin detector such as a mobile phone or a computer. The communication port 100 of the skin tester is adapted to the communication interface of the external smart terminal. For example, when the communication port 100 of the skin tester is a port such as a headphone plug or a USB plug, correspondingly, the communication interface of the external smart terminal is detected with the skin. The communication port 100 of the instrument is adapted to an interface such as a headphone jack or a USB socket, or when the external smart terminal is a mobile phone and the communication interface of the external smart terminal is a headphone jack, the communication port 100 of the skin detector is a headphone plug.

In the embodiment of the present invention, the frequency of the sine wave AC signal may be 22 KHz. The sine wave AC signal with a frequency of 22KHz can maximize the communication power of the communication interface of the external intelligent terminal, and the human ear cannot recognize the sine wave AC signal with the frequency of 22KHz. When the skin detector is connected to the communication interface of the external intelligent terminal through the communication port 100 and establishes a connection with the external intelligent terminal, the external intelligent terminal generates a sine wave AC signal of a preset frequency, for example, a 1.5V sine wave AC signal of 22 kHz. The sine wave AC signal is input to the communication interface power take-off circuit 300 through the communication interface of the external smart terminal and the communication port 100 of the skin tester. The communication interface power take-off circuit 300 converts the sinusoidal AC signal into a DC supply voltage required for the electrical load 200, which is preferably 3.3V.

The embodiment of the present invention receives the sine wave AC signal of the preset frequency output by the communication interface of the external intelligent terminal through the communication interface power take-off circuit 300, and converts the sine wave AC signal into the DC power supply voltage required for the power load 200, thereby The output of the stable DC power supply voltage supplies power to the power load 200, so that the skin tester does not need to be equipped with battery power, which improves the stability and ease of use of the skin tester, and also reduces the cost of the skin tester and enhances skin detection. The appearance of the instrument is beautiful.

Please refer to FIG. 2 . Specifically, the communication interface power take-off circuit 300 of the skin tester of the present invention includes a voltage. The conversion module 310 and the voltage stabilization module 320.

The voltage conversion module 310 is connected to the communication port 100, and the voltage conversion module 310 is configured to receive a sine wave AC signal of a preset frequency generated by the external smart terminal through the communication port 100, and convert the sine wave AC signal A DC voltage signal required to meet the power supply requirements of the electrical load 200.

The voltage stabilizing module 320 is respectively connected to the voltage conversion module 310 and the power load 200, and the voltage stabilizing module 320 is configured to voltage the DC voltage signal and output the DC power required by the power load 200. Voltage.

In this embodiment, when the skin detector is connected to the communication interface of the external intelligent terminal through the communication port 100 and establishes a connection with the external intelligent terminal, the sine wave AC signal generated by the external intelligent terminal passes through the communication interface of the external intelligent terminal, and the skin is detected. The communication port 100 of the instrument is input to the voltage conversion module 310 of the communication interface power take-off circuit 300. When receiving the sine wave AC signal, the voltage conversion module 310 converts the sine wave AC signal into a DC voltage signal that meets the power supply requirement of the power load 200, and outputs the DC voltage signal to the voltage stabilization module 320. The voltage stabilizing module 320 regulates the DC voltage signal, and outputs a stable DC power supply voltage to the power load 200 to provide the required DC power supply voltage to the power load 200. For example, the voltage conversion module 310 converts a 1.5V sine wave AC signal into a DC voltage signal of 4.5V or higher, and the voltage stabilization module 320 stabilizes the DC voltage signal to stabilize the DC voltage at 3.3V, thereby outputting 3.3V. The DC supply voltage supplies power to the electrical load 200.

Further, the communication interface power take-off circuit 300 further includes a signal isolation module 330, and the signal isolation module 330 is connected to the communication port 100. The signal isolation module 330 is configured to isolate the signal of the skin detector and the external intelligent terminal, so that the signal of the skin detector is isolated from the signal of the external intelligent terminal when the skin detector is connected to the communication interface of the external intelligent terminal. The two do not interfere with each other, thus ensuring the stability of communication between the two.

Referring to FIG. 3 , specifically, the voltage conversion module 310 in the communication interface power take-off circuit 300 includes at least two boosting units for boosting the sine wave AC signal and The sinusoidal AC signal is converted to a DC voltage signal that meets the power requirements of the power load 200.

The voltage conversion module 310 has different stages of boosting, and the magnitude of the boosted voltage is different. In the embodiment of the present invention, the at least two boosting units include a first boosting unit 311, a second boosting unit 312, and a third. The boosting unit 313 and the fourth boosting unit 314.

The first boosting unit 311 is connected to the communication port 100, and the first boosting unit 311 is configured to boost the sine wave AC signal and output a first boosting signal.

The second boosting unit 312 is respectively connected to the communication port 100 and the first boosting unit 311, and the second boosting unit 312 is configured to superimpose the sine wave alternating current signal and the first boosting signal. The voltage signal is boosted and a second boost signal is output.

The third boosting unit 313 is respectively connected to the communication port 100 and the second boosting unit 312, and the third boosting unit 313 is configured to superimpose the sine wave alternating current signal and the second boosting signal. The voltage signal is boosted and a third boost signal is output.

The fourth boosting unit 314 is respectively connected to the communication port 100, the third boosting unit 313, and the voltage stabilizing circuit, and the fourth boosting unit 314 is configured to use the sinusoidal alternating current signal and the third boosting unit. The voltage signal superimposed by the signal is boosted, and the DC voltage signal is output to the voltage stabilizing circuit.

In the present embodiment, the sine wave AC signals input from the communication port 100 are input to the first boosting unit 311, the second boosting unit 312, the third boosting unit 313, and the fourth boosting unit 314, respectively. The first boosting unit 311 boosts the input sine wave AC signal to obtain a first boosting signal, and outputs the first boosting signal to the second boosting unit 312; the second boosting unit 312 pairs the sine wave The voltage signal superimposed with the first boost signal is boosted to obtain a second boost signal, and the second boost signal is output to the third boosting unit 313; the third boosting unit 313 pairs the sine wave The voltage signal superimposed by the AC signal and the second boost signal is boosted to obtain a third boost signal, and the third boost signal is output to the fourth boosting unit 314; the fourth boosting unit 314 pairs the sine wave The voltage signal superimposed by the AC signal and the third boost signal is boosted to obtain a DC voltage signal that meets the power supply requirement of the power load 200.

Referring again to FIG. 3, the first boosting unit 311 includes a first dual Schottky diode D1, a first capacitor C1, and a second capacitor C2; and the second boosting unit 312 includes a second dual Schottky diode D2, a third a capacitor C3 and a fourth capacitor C4; the third boosting unit 313 includes a third dual Schottky diode D3, a fifth capacitor C5, and a sixth capacitor C6; the fourth boosting unit 314 includes a fourth dual Schottky diode D4, The seventh capacitor C7 and the eighth capacitor C8.

The common pole p3 of the first dual Schottky diode D1 is connected to the communication port 100 via the first capacitor C1, the anode p1 of the first dual Schottky diode D1 is grounded, and the cathode p2 and the second of the first dual Schottky diode D1 are connected. The anode p1 of the dual Schottky diode D2 is connected and grounded via the second capacitor C2.

The common pole p3 of the second dual Schottky diode D2 is connected to the communication port 100 via the third capacitor C3, and the cathode p2 of the second dual Schottky diode D2 is connected to the anode p1 of the third dual Schottky diode D3. And grounded via the fourth capacitor C4.

The common pole p3 of the third dual Schottky diode D3 is connected to the communication port 100 via the fifth capacitor C5, and the cathode p2 of the third dual Schottky diode D3 is connected to the anode p1 of the fourth dual Schottky diode D4, and via The sixth capacitor C6 is grounded.

The common pole p3 of the fourth dual Schottky diode D4 is connected to the communication port 100 via the seventh capacitor C7, the cathode p2 of the fourth dual Schottky diode D4 is connected to the voltage stabilizing module 320, and is grounded via the eighth capacitor C8.

The present invention employs a low voltage drop dual Schottky diode as a diode in a boost topology that provides a relatively high power DC supply voltage to the electrical load 200 of the skin tester.

The voltage stabilizing module 320 includes a voltage stabilizing chip U1 and a power output terminal VCC; the input pin Vin of the voltage stabilizing chip U1 and the enable pin EN of the voltage stabilizing chip U1 are both connected to the voltage converting module 310, and the ground pin GND of the voltage stabilizing chip U1 Grounding, the output pin Vout of the voltage regulator chip U1 is connected to the power output terminal VCC.

In order to make the output voltage more stable, the voltage stabilizing module 320 further includes a ninth capacitor C9 and a tenth capacitor C10; one end of the ninth capacitor C9 is connected to the voltage conversion module 310, and is respectively connected to the input pin Vin of the voltage regulator chip U1. The enable pin EN of the die U1 is connected, and the other end of the ninth capacitor C9 is grounded; one end of the tenth capacitor C10 is connected to the output pin Vout of the voltage regulator chip U1, and is connected to the power output terminal VCC, and the tenth capacitor C10 is One end is grounded.

The voltage outputted by the voltage conversion module 310 charges the ninth capacitor C9, and the voltage on the ninth capacitor C9 is the voltage input to the input pin Vin of the voltage regulator chip U1 and the enable pin EN of the voltage regulator chip U1, when the voltage regulator chip U1 When the voltage of the enable pin EN is low, the voltage regulator chip U1 operates to regulate the voltage output from the voltage conversion module 310. The voltage outputted from the output terminal of the voltage regulator chip U1 charges the tenth capacitor C10, and the voltage on the tenth capacitor C10 is the DC power supply voltage outputted through the power supply output terminal VCC. The ninth capacitor C9 and the tenth capacitor C10 also function as a filter.

The signal isolation module 330 includes a first diode DM and a second diode DN; the cathode of the first diode DM and the cathode of the second diode DN are both connected to the communication port 100, the first diode DM The anode of the anode and the second diode DN are both grounded.

The first diode DM and the second diode DN are isolated from the ground signal, and the signal of the skin detector is isolated from the signal of the external intelligent terminal of the ground signal, so that the communication between the skin detector and the external intelligent terminal is not disturbed. Enhance the stability of communication between the two.

The working principle of the skin detector in the embodiment of the present invention is specifically described as follows:

When the skin detector is connected to the communication interface of the external intelligent terminal through the communication port 100, the external intelligent terminal outputs a 22KHz 1.5V sine wave AC signal through its communication interface, and the sine wave AC signal passes through the communication port 100 of the skin detector. The communication interface power take-off circuit 300 provides a signal source, that is, a 1.5 kHz sine wave AC signal of 22 kHz is transmitted to the voltage conversion module 310 of the communication interface power take-off circuit 300.

As shown in FIG. 3, the sine wave AC signal provided by the external intelligent terminal is applied to the first capacitor C1. When the sine wave AC signal is in the positive half axis, the common pole p3 and the cathode p2 of the first dual Schottky diode D1. In the on state, the sine wave AC signal charges the second capacitor C2 after passing through the first capacitor C1, and the maximum value of the second capacitor C2 is the maximum value of the input sine wave AC signal.

Times. When the sinusoidal AC signal is in the negative half axis, the current can be prevented from being reversed due to the reverse action of the first dual Schottky diode D1. At this time, the voltage of the third capacitor C3 and the second capacitor C2 is superposed to be the fourth capacitor C4. Charging, at this time, the maximum value of the fourth capacitor C4 is the maximum value of the input sine wave AC signal.

Times. Similarly, when the sine wave AC signal reaches the eighth capacitor C8, the voltages of the seventh capacitor C7 and the sixth capacitor C6 are superimposed to charge the eighth capacitor C8, and the charging voltage of the eighth capacitor C8 is the input sine wave AC signal. Maximum value

Therefore, the voltage conversion module 310 can achieve the effect of double voltage boosting.

The charging voltage on the eighth capacitor C8 is a DC voltage signal outputted by the voltage conversion module 310 to the voltage stabilizing module 320. The DC voltage signal is output to the input pin Vin of the voltage regulator chip U1, and the DC voltage signal is charged to the ninth capacitor C9. The enable pin EN of the voltage regulator chip U1 is at a high level, the voltage regulator chip U1 operates when the enable pin EN of the voltage regulator chip U1 is at a high level, and the voltage regulator chip U1 performs a DC voltage signal output by the voltage conversion module 310. The voltage regulation will output a stable voltage through the output pin Vout of the voltage regulator chip U1, and the voltage of the voltage regulation charges the tenth capacitor C10, and the charging voltage on the tenth capacitor C10 is the DC power supply voltage output by the voltage regulator module 320. The DC supply voltage is supplied to the power load 200 of the skin tester via the power supply output terminal VCC, which is preferably a 3.3V DC voltage.

In the embodiment of the present invention, when the intelligent terminal is connected with the communication interface power take-off circuit, the smart detector provides a sine wave AC signal of a certain frequency to the skin detector, so that the skin detector can pass the communication signal according to the sine wave AC signal. The power take-off circuit converts the sinusoidal AC signal into a DC supply voltage required for the electrical load of the skin tester. Therefore, the skin detector does not need to be equipped with battery power, but can be powered by the communication interface of the smart terminal, which can improve the stability of the power supply of the skin detector and enable Convenience, and can reduce the cost of the skin tester and enhance the appearance of the skin tester.

The embodiment of the present invention further provides a skin detecting system, comprising: a smart terminal and a skin detecting device in the above embodiment, wherein a communication interface of the smart terminal is connected to a communication port of the skin detector, The smart terminal generates a sine wave AC signal of a preset frequency when connected with the skin detector, and outputs the sine wave AC signal through the communication interface; the communication interface power take-off circuit of the skin detector passes the communication The port receives the sinusoidal AC signal and converts the sinusoidal AC signal to a DC supply voltage required for an electrical load of the skin tester. Therefore, the skin detector does not need to be equipped with battery power, but can be powered by the communication interface of the smart terminal, and can reduce the cost of the skin detector and enhance the appearance of the skin detector.

For other structures and functions of the skin tester in the skin detection system, refer to the skin tester embodiment, which will not be repeated here.

The above is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformation of the present invention and the contents of the drawings may be directly or indirectly applied to other related technologies. The fields are all included in the scope of patent protection of the present invention.

Claims

A skin detector includes a communication port and a power load, and the communication port is configured to be connected to a communication interface of the external smart terminal. The skin detector further includes:

a communication interface power take-off circuit is respectively connected to the communication port and the power load, and is configured to receive, by the communication port, a sine wave AC signal of a preset frequency generated by the external smart terminal, and the sine wave AC signal Converted to the DC supply voltage required for the electrical load.
The skin tester according to claim 1, wherein the frequency of the sine wave AC signal is 22 kHz.
The skin detector according to claim 1 or 2, wherein the communication interface power take-off circuit comprises:

a voltage conversion module connected to the communication port, and the voltage conversion module is configured to receive, by the communication port, a sine wave AC signal of a preset frequency generated by the external smart terminal, and convert the sine wave AC signal a DC voltage signal required to meet the power supply requirements of the electrical load;

a voltage stabilizing module respectively connected to the voltage conversion module and the power load, and the voltage stabilizing module is configured to regulate the DC voltage signal and output a DC power supply voltage required by the power load .
The skin detector according to claim 3, wherein the voltage conversion module comprises at least two boosting units, and the at least two boosting units are configured to boost the sinusoidal alternating current signal and The sinusoidal AC signal is converted to a DC voltage signal that meets the power requirements of the electrical load.
The skin tester according to claim 4, wherein the at least two boosting units comprise:

a first boosting unit connected to the communication port, and configured to boost the sine wave AC signal and output a first boost signal;

a second boosting unit, respectively connected to the communication port and the first boosting unit, and used for And boosting a voltage signal superposed by the sine wave AC signal and the first boost signal, and outputting a second boost signal;

a third boosting unit connected to the communication port and the second boosting unit, respectively, and configured to boost a voltage signal superposed by the sine wave alternating current signal and the second boosting signal, and Outputting a third boost signal;

a fourth boosting unit is respectively connected to the communication port, the third boosting unit, and the voltage stabilizing circuit, and configured to perform voltage signal superimposed on the sine wave AC signal and the third boost signal Boosting, and outputting the DC voltage signal to the voltage stabilizing circuit.
The skin detector according to claim 5, wherein the first boosting unit comprises a first dual Schottky diode, a first capacitor and a second capacitor; and the second boosting unit comprises a second pair a Schottky diode, a third capacitor, and a fourth capacitor; the third boosting unit includes a third dual Schottky diode, a fifth capacitor, and a sixth capacitor; and the fourth boosting unit includes a fourth dual SCHOTT a base diode, a seventh capacitor, and an eighth capacitor;

a common pole of the first dual Schottky diode is connected to the communication port via the first capacitor, an anode of the first dual Schottky diode is grounded, and a cathode of the first dual Schottky diode An anode of the second dual Schottky diode is connected and grounded via the second capacitor;

a common pole of the second dual Schottky diode is connected to the communication port via the third capacitor, and a cathode of the second dual Schottky diode is connected to an anode of the third dual Schottky diode, And being grounded via the fourth capacitor;

a common pole of the third dual Schottky diode is connected to the communication port via the fifth capacitor, and a cathode of the third dual Schottky diode is connected to an anode of the fourth dual Schottky diode, And grounded via the sixth capacitor;

a common pole of the fourth dual Schottky diode is connected to the communication port via the seventh capacitor, a cathode of the fourth dual Schottky diode is connected to the voltage stabilizing module, and via the eighth The capacitor is grounded.
The skin tester according to claim 3, wherein the voltage stabilizing module comprises a voltage stabilizing chip and a power output end;

An input pin of the voltage regulator chip and an enable pin of the voltage regulator chip are connected to the voltage conversion module The ground pin of the voltage stabilizing chip is grounded, and an output pin of the voltage stabilizing chip is connected to the power output end.
The skin tester according to claim 7, wherein the voltage stabilizing module further comprises a ninth capacitor and a tenth capacitor;

One end of the ninth capacitor is connected to the voltage conversion module, and is respectively connected to an input pin of the voltage stabilizing chip and an enable pin of the voltage stabilizing chip, and the other end of the ninth capacitor is grounded; One end of the tenth capacitor is connected to an output pin of the voltage stabilizing chip, and is connected to the power output end, and the other end of the tenth capacitor is grounded.
The skin detector according to claim 3, wherein the communication interface power take-off circuit further comprises a signal isolation module, and the signal isolation module is connected to the communication port for isolating the skin detector from the outside The ground signal of the intelligent terminal.
The skin detector according to claim 9, wherein the signal isolation module comprises a first diode and a second diode;

The cathode of the first diode and the cathode of the second diode are both connected to the communication port, and the anode of the first diode and the anode of the second diode are both grounded.
A skin detecting system, comprising: a smart terminal; and the skin detecting device according to any one of claims 1 to 10;

a communication interface of the smart terminal is connected to a communication port of the skin detector, and the smart terminal generates a sine wave AC signal of a preset frequency when connected to the skin detector, and outputs the a sinusoidal wave AC signal; the communication interface power take-off circuit of the skin detector receives the sine wave AC signal through the communication port, and converts the sine wave AC signal into a power load required by the skin detector DC supply voltage.