Transcranial electrical stimulation analyzer and circuit thereof

Abstract

The utility model discloses a transcranial electrical stimulation analyzer and a circuit thereof, and relates to the technical field of transcranial electrical stimulation, the transcranial electrical stimulation analyzer comprises an analyzer body and an electrical stimulation circuit, the analyzer body comprises a head cover and an electrode slice, the electrical stimulation circuit is suitable for the analyzer body, and by arranging an amplification unit and utilizing a thirty-first single-chip microcomputer, the transcranial electrical stimulation analyzer can be used for analyzing the transcranial electrical stimulation. A transcranial electrical stimulation channel can be realized by only needing one chip of the thirty-first single-chip microcomputer, a large number of connecting pieces and accessories are not needed, a transcranial electrical stimulation circuit is simplified, and the assembly difficulty of a user is reduced; through the arrangement of the main control unit, the ADC, the serial port, the DAC and other pins of the first single-chip microcomputer are utilized, the ADC is connected with the impedance detection unit, the electrode voltage is sampled, analog voltage signals are converted into digital signals, the digital signals are processed and analyzed by the mcu, then the impedance data of the electrode can be obtained, and therefore the position and the property of a circuit where the analyzer breaks down can be judged in time.

Description

Technical Field

[0001] The utility model relates to the technical field of transcranial electrical stimulation, in particular to a transcranial electrical stimulation analyzer and a circuit thereof. Background Art

[0002] Transcranial Electrical Stimulation (tES) is a device developed based on the understanding of brain function and neuroplasticity. Neuroplasticity refers to the ability of the brain to adapt to changes in experience and environment through changes in structure and function. tES technology uses this plasticity to non-invasively apply electrical stimulation to the brain to regulate the excitability of neurons and the function of neural networks. The tES circuit usually includes a power supply (such as a battery), a control circuit, and electrodes. The current is generated from the power supply, regulated by the control circuit, and then transmitted to the scalp and brain tissue through the electrodes.

[0003] The existing transcranial electrical stimulation analyzer has a large overall size and is not easy to carry. At the same time, it uses many connectors and accessories inside and has a complex structure, which increases the difficulty of assembly for users. When the circuit of the analyzer fails, it is difficult to promptly determine the location and nature of the fault. Therefore, it is necessary to provide a transcranial electrical stimulation analyzer and its circuit to solve the above-mentioned problems. Utility Model Content

[0004] In order to solve the above-mentioned technical problems, a transcranial electrical stimulation analyzer and its circuit are provided. This technical solution solves the problem that the existing transcranial electrical stimulation analyzer proposed in the above-mentioned background technology has a large overall size and is not easy to carry. At the same time, it uses many connectors and accessories inside, has a complex structure, and increases the difficulty of assembly for users.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A transcranial electrical stimulation analyzer and its circuit, comprising an analyzer body and an electrical stimulation circuit, wherein the analyzer body comprises a head cover and an electrode sheet, the electrical stimulation circuit is applicable to the analyzer body, the electrode sheet is arranged on the surface of the head cover, and the electrical stimulation circuit comprises:

[0007] The main control unit is mainly composed of a clock circuit and a reset circuit, which is used to adjust the stimulation parameters and control other unit circuits;

[0008] The regulating unit is mainly used as a positive and negative voltage source of a constant current source to adjust the output voltage and control the opening and closing of the power supply;

[0009] The amplifier unit is mainly used as the core component circuit of the electrical stimulation, the HOW-LAND constant current source circuit, for realizing a transcranial electrical stimulation channel;

[0010] The first reference unit is mainly used as a reference voltage source to determine the positive and negative standards of the output voltage;

[0011] A charging unit, mainly used as a lithium battery charging circuit, for powering the lithium battery used for transcranial electrical stimulation;

[0012] An impedance detection unit, used to convert the voltage output by the stimulation electrode;

[0013] A second reference unit is used to provide a reference voltage to participate in the calculation;

[0014] The main control unit includes a first single-chip microcomputer and a second single-chip microcomputer, a 28th pin of the first single-chip microcomputer is connected in series with a 14th resistor and grounded, a 10th resistor is connected in series between the 5th pin and the 6th pin of the first single-chip microcomputer, a 5th pin of the first single-chip microcomputer is connected in series with a 3rd capacitor, a 6th pin of the first single-chip microcomputer is connected in series with a 4th capacitor, one end of the 3rd capacitor and the 4th capacitor are both grounded, a 12th resistor is connected in series with the 7th pin of the first single-chip microcomputer, and a 6th capacitor is connected in series with the 7th pin of the first single-chip microcomputer, the 6th capacitor is connected in parallel with the first switch, and a 13th resistor of the second single-chip microcomputer is connected in series with an 11th resistor;

[0015] The amplification unit includes a thirty-first single-chip microcomputer, a first pin of the thirty-first single-chip microcomputer is electrically connected to a sixty-fifth resistor and a sixty-seventh resistor, the sixty-fifth resistor is connected in parallel with an eighty-second capacitor, a second pin of the first single-chip microcomputer is connected in series with a sixty-third resistor, a third pin of the first single-chip microcomputer is connected in series with a sixty-fourth resistor and a sixty-sixth resistor, and the sixty-fourth resistor and the sixty-sixth resistor are connected in parallel.

[0016] Preferably, the adjustment unit includes a twenty-seventh single-chip microcomputer, a first pin of the twenty-seventh single-chip microcomputer is electrically connected between the forty-seventh resistor and the forty-eighth resistor, the first pin of the twenty-seventh single-chip microcomputer is connected in series with the fifty-fifth capacitor, the end of the fifty-fifth capacitor away from the twenty-seventh single-chip microcomputer is electrically connected to the anode of the sixth diode, the cathode of the sixth diode is electrically connected to the anode of the seventh diode, the fifth pin of the twenty-seventh single-chip microcomputer is electrically connected to the forty-ninth resistor and one end of the fifty-eighth capacitor at the same time, one end of the fifty-eighth capacitor is electrically connected to the cathode of the eighth diode, the anode of the eighth diode is connected in series with the tenth inductor and is electrically connected to the sixth pin of the twenty-seventh single-chip microcomputer.

[0017] Preferably, the first reference unit includes a forty-fifth single-chip microcomputer, the first pin and the second pin of the forty-fifth single-chip microcomputer are electrically connected to one end of the ninety-first capacitor, the first pin of the forty-fifth single-chip microcomputer is also electrically connected to one end of the ninety-second capacitor, and the third pin of the forty-fifth single-chip microcomputer is connected in series with the ninety-third capacitor.

[0018] Preferably, the charging unit includes a forty-sixth single-chip microcomputer, a first pin of the forty-sixth single-chip microcomputer is electrically connected to the one hundredth capacitor and the one hundred and first capacitor at the same time, a second pin of the forty-sixth single-chip microcomputer is electrically connected to one end of the one hundred and third capacitor and is grounded, and a second pin of the forty-sixth single-chip microcomputer is electrically connected to a first pin of the second single-chip microcomputer.

[0019] Preferably, the charging unit also includes a twelfth inductor, one end of the twelfth inductor is electrically connected to the one-hundred-and-second capacitor, one end of the one-hundred-and-second capacitor away from the twelfth inductor is electrically connected to the seventh pin of the forty-sixth single-chip microcomputer, and the eighth pin of the forty-sixth single-chip microcomputer is electrically connected between the twelfth inductor and the one-hundred-and-second capacitor.

[0020] Preferably, the impedance detection unit includes a thirty-third single-chip microcomputer, a first pin of the thirty-third single-chip microcomputer is connected in series with a seventy-first resistor, a second pin of the thirty-third single-chip microcomputer is connected in series with a sixty-eighth resistor and is electrically connected to the first pin, a third pin of the thirty-third single-chip microcomputer is connected in series with a sixty-ninth resistor, a fifth pin of the thirty-third single-chip microcomputer is connected in series with a seventy-first resistor, a sixth pin of the thirty-third single-chip microcomputer is electrically connected to the seventy-third resistor and the eightieth resistor at the same time, and the eightieth resistor is connected in series with the seventy-second resistor and is electrically connected to the seventh pin of the thirty-third single-chip microcomputer.

[0021] Preferably, the impedance detection unit is also a hardware operation circuit, the same-direction input terminal of the operational amplifier is connected to the stimulation electrode pin, and the mathematical operation formula corresponding to the simplified circuit of the impedance detection unit is:

[0022] Preferably, the second reference unit includes a thirty-second single-chip microcomputer, the chip used in the thirty-second single-chip microcomputer is the same as that in the forty-fifth single-chip microcomputer, and the peripheral circuit structures of the thirty-second single-chip microcomputer and the forty-fifth single-chip microcomputer are similar.

[0023] Compared with the prior art, the beneficial effects of the utility model are:

[0024] In a transcranial electrical stimulation analyzer and its circuit proposed in this scheme, by setting an amplification unit and utilizing the thirty-first single-chip microcomputer, only one chip of the thirty-first single-chip microcomputer is needed to realize a transcranial electrical stimulation channel, without a large number of connectors and accessories, thereby simplifying the transcranial electrical stimulation circuit and reducing the difficulty of assembly for users; by setting a main control unit and utilizing the ADC, serial port and DAC pins of the first single-chip microcomputer, the ADC is connected to the impedance detection unit, and the impedance data of the electrode can be obtained by simply sampling the electrode voltage and converting the analog voltage signal into a digital signal after processing and analysis by the MCU, thereby timely judging the location and nature of the circuit where the analyzer has a fault, and also helping to ensure the impedance matching between the signal source and the load. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a three-dimensional schematic diagram of the utility model;

[0026] Figure 2 This is a circuit structure diagram of the main control unit in the utility model;

[0027] Figure 3 This is a circuit structure diagram of the regulating unit in the utility model;

[0028] Figure 4 This is a circuit structure diagram of the amplification unit in the utility model;

[0029] Figure 5 is a circuit structure diagram of the first reference unit in the utility model;

[0030] Figure 6 This is a circuit diagram of the charging unit in the utility model;

[0031] Figure 7 This is a circuit structure diagram of the impedance detection unit in the utility model;

[0032] Figure 8 For the utility model Figure 7 Simplified circuit diagram of the circuit in

[0033] Fig. 9 is a circuit structure diagram of the second reference unit in the utility model;

[0034] The numbers in the figure are:

[0035] 1000, head cover; 2000, electrode sheet; DETAILED DESCRIPTION

[0036] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0037] Reference Figure 1-9 As shown, a transcranial electrical stimulation analyzer and its circuit include an analyzer body and an electrical stimulation circuit. The analyzer body includes a head cover 1000 and an electrode sheet 2000. The electrical stimulation circuit is applicable to the analyzer body. The electrode sheet 2000 is arranged on the surface of the head cover 1000. The electrical stimulation circuit includes:

[0038] The main control unit is mainly composed of a clock circuit and a reset circuit, which is used to adjust the stimulation parameters and control other unit circuits;

[0039] The regulating unit is mainly used as a positive and negative voltage source of a constant current source to adjust the output voltage and control the opening and closing of the power supply;

[0040] The amplifier unit is mainly used as the core component circuit of the electrical stimulation, the HOW-LAND constant current source circuit, for realizing a transcranial electrical stimulation channel;

[0041] The first reference unit is mainly used as a reference voltage source to determine the positive and negative standards of the output voltage;

[0042] A charging unit, mainly used as a lithium battery charging circuit, for powering the lithium battery used for transcranial electrical stimulation;

[0043] An impedance detection unit, used to convert the voltage output by the stimulation electrode;

[0044] A second reference unit is used to provide a reference voltage to participate in the calculation;

[0045] The main control unit includes a first single-chip microcomputer U37.1 and a second single-chip microcomputer U37.2. The twenty-eighth pin PB2 of the first single-chip microcomputer U37.1 is connected in series with a fourteenth resistor R14 and grounded. A tenth resistor R10 is connected in series between the fifth pin IN and the sixth pin OUT of the first single-chip microcomputer U37.1. The fifth pin IN of the first single-chip microcomputer U37.1 is connected in series with a third capacitor C3. The sixth pin OUT of the first single-chip microcomputer U37.1 is connected in series with a fourth capacitor C4. The third capacitor C3 and the fourth capacitor C One end of 4 is grounded, the seventh pin NRST of the first single-chip microcomputer U37.1 is connected in series with a twelfth resistor R12, and the seventh pin NRST of the first single-chip microcomputer U37.1 is connected in series with a sixth capacitor C6, the sixth capacitor C6 is connected in parallel with the first switch SW1, the thirteenth resistor R13 of the second single-chip microcomputer U37.2 is connected in series with an eleventh resistor R11, and the chip model of the first single-chip microcomputer U37.1 in the main control unit is STM32F103RCT6, which is mainly composed of a clock circuit and a reset circuit. Many pins of the chip are brought out for specific functions, such as ADC, serial port and DAC pins. The ADC is connected to the post-stage impedance detection circuit. By sampling the electrode voltage, the analog voltage signal is converted into a digital signal, which is processed and analyzed by the MCU to obtain the impedance data of the electrode. The DAC is used to control the output current waveform of the electrode, and can output sine waves, pulse waves and random noise;

[0046] The amplification unit includes a thirty-first single-chip microcomputer U31, the first pin OUTA of the thirty-first single-chip microcomputer U31 is electrically connected to the sixty-fifth resistor R65 and the sixty-seventh resistor R67, the sixty-fifth resistor R65 is connected in parallel with the eighty-second capacitor C82, the second pin -INA of the first single-chip microcomputer U37.1 is connected in series with the sixty-third resistor R63, the third pin +INA of the first single-chip microcomputer U37.1 is connected in series with the sixty-fourth resistor R64 and the sixty-sixth resistor R66, and the sixty-fourth resistor R64 and the sixty-sixth resistor R66 are connected in parallel, the circuit of the amplification unit is the core component circuit HOW-LAND constant current source circuit of electrical stimulation, the thirty-first single-chip microcomputer U31 is the core component of the circuit, the model is ADA4522 precision operational amplifier, the chip integrates two operational amplifiers, so only one chip is needed to realize a transcranial electrical stimulation channel, the in-phase input terminal of the operational amplifier is connected to the DAC pin of the single-chip microcomputer, the change of the voltage waveform on the DAC pin is reflected in the output of the constant current source as a current signal with the same waveform change, so the constant current source belongs to the voltage control type. The inverting input of the op amp is connected to a reference voltage source, provided by a TPS78300 linear voltage regulator chip, such as Figure 4 The voltage shown in the figure is 1.65v, which is half of the maximum voltage of DAC. When the DAC voltage is greater than 1.65v, the output is a positive current. When the DAC voltage is less than 1.65v, the current source outputs a reverse current, i.e. a negative current. In this way, the stimulation electrode can output a true AC current waveform.

[0047] Further, the adjustment unit includes a twenty-seventh single-chip computer U27, the first pin NFB1 of the twenty-seventh single-chip computer U27 is electrically connected between the forty-seventh resistor R47 and the forty-eighth resistor R48, the first pin NFB1 of the twenty-seventh single-chip computer U27 is connected in series with the fifty-fifth capacitor C55, the end of the fifty-fifth capacitor C55 away from the twenty-seventh single-chip computer U27 is electrically connected to the anode of the sixth diode D6, the cathode of the sixth diode D6 is electrically connected to the anode of the seventh diode D7, the fifth pin FB2 of the twenty-seventh single-chip computer U27 is electrically connected to the forty-ninth resistor R49 and one end of the fifty-eighth capacitor R58 at the same time, one end of the fifty-eighth capacitor C58 is electrically connected to the cathode of the eighth diode D8, the anode of the eighth diode D8 is connected in series with the tenth inductor L10 and is electrically connected to the sixth pin SW2 of the twenty-seventh single-chip computer U27, the chip model of the twenty-seventh single-chip computer U27 is LT1945, the input voltage is 5v, and two independent voltages are output, and both voltages are adjustable. The resistor connected to the FB pin in the circuit can adjust the output voltage, and the NFB1 pin adjusts the negative voltage. The FB2 pin adjusts the positive voltage. The resistor value set in the figure below allows the chip to output a voltage of plus or minus 25V. This voltage powers the op amp of the constant current source and also powers the impedance detection circuit. The input voltage of the chip is 5V, which is provided by the tps5430 power supply circuit. LT1945 has two pins that can control the power on and off, namely SH1 and SH2. These two pins are connected to the microcontroller, and the absolute control of the power supply can be achieved in the program. When the system detects a sudden change in the electrode impedance, it can quickly control the LT1945 to turn off the output, which plays a protective role.

[0048] Further, the first reference unit includes a forty-fifth single-chip computer U45, a first pin OUT and a second pin SNS of the forty-fifth single-chip computer U45 are electrically connected to one end of the ninety-first capacitor C91, the first pin OUT of the forty-fifth single-chip computer U45 is also electrically connected to one end of the ninety-second capacitor C92, and a third pin FB of the forty-fifth single-chip computer U45 is connected in series with the ninety-third capacitor C93.

[0049] Further, the charging unit includes a forty-sixth single-chip microcomputer U46, a first pin VSYS of the forty-sixth single-chip microcomputer U46 is electrically connected to the one-hundredth capacitor C100 and the one-hundredth capacitor C101 at the same time, a second pin VOUT of the forty-sixth single-chip microcomputer U46 is electrically connected to one end of the one-hundredth capacitor C103 and grounded, a second pin VOUT of the forty-sixth single-chip microcomputer U46 is electrically connected to a first pin VSYS of the second single-chip microcomputer U37.2, and the charging unit is a lithium battery charging circuit. Transcranial electrical stimulation is powered by an 8.4v lithium battery. The voltage of a single lithium battery is 3.7v, so two lithium batteries are required to be connected in series to power the device. Ordinary lithium battery charging chips are also designed to charge one lithium battery, such as Figure 6 As shown, the 46th single-chip microcomputer in the charging unit circuit uses the IP2325 charging chip, which can charge two lithium-ion batteries in series. The chip input voltage is 5v, and the internal integrated booster circuit increases the 5v to a maximum of 8.4v to charge the battery. The chip also has a charging protection function. When it detects that the battery is full, it will automatically shut down the charging to prevent the battery from overcharging.

[0050] Furthermore, the charging unit also includes a twelfth inductor L12, one end of the twelfth inductor L12 is electrically connected to the one-hundred-and-second capacitor C102, one end of the one-hundred-and-second capacitor C102 away from the twelfth inductor L12 is electrically connected to the seventh pin BST of the forty-sixth microcontroller U46, and the eighth pin LX of the forty-sixth microcontroller U46 is electrically connected between the twelfth inductor L12 and the one-hundred-and-second capacitor C102.

[0051] Further, the impedance detection unit includes a thirty-third single-chip microcomputer U33, the first pin OUTA of the thirty-third single-chip microcomputer U33 is connected in series with a seventy-first resistor R71, the second pin -INA of the thirty-third single-chip microcomputer U33 is connected in series with a sixty-eighth resistor R68 and is electrically connected to the first pin OUTA, the third pin +INA of the thirty-third single-chip microcomputer U33 is connected in series with a sixty-ninth resistor R69, the fifth pin +INB of the thirty-third single-chip microcomputer U33 is connected in series with a seventy-first resistor R70, the sixth pin OUTB of the thirty-third single-chip microcomputer U33 is electrically connected to the seventy-third resistor R73 and the eightieth resistor R80 at the same time, the eightieth resistor R80 is connected in series with the seventy-second resistor R72 and is electrically connected to the seventh pin OUTB of the thirty-third single-chip microcomputer U33. The impedance detection unit is also a hardware operation circuit, the same-direction input terminal of the operational amplifier is connected to the stimulation electrode pin, and the mathematical operation formula corresponding to the simplified circuit of the impedance detection unit is:

[0052]

[0053] Furthermore, the second reference unit includes a thirty-second single-chip microcomputer U32, the chip used in the thirty-second single-chip microcomputer U32 is the same as the forty-fifth single-chip microcomputer U45, and the circuit configuration of the periphery of the thirty-second single-chip microcomputer U32 and the forty-fifth single-chip microcomputer U45 is similar. The impedance detection unit is only a part of the impedance detection circuit, and the function of this part of the circuit is to convert the maximum positive and negative 25V voltage output by the stimulation electrode into a 0-3.3V voltage. The input voltage range of the ADC of the thirty-third single-chip microcomputer U33 is 0-3.3V. A voltage exceeding 3.3V will damage the IO port of the single-chip microcomputer and even cause the entire chip to be paralyzed, so the electrode voltage must be converted. At the same time, in order to prevent the failure of the subsequent circuit, a 3.3V voltage regulator diode is added to the ADC pin, which plays a role of voltage clamping when the input voltage exceeds 3.3V. Figure 8 The simplified circuit in needs to provide a reference voltage to participate in the calculation. The reference voltage Vref is generated by the linear regulator TPS7A8300, and the voltage is 1.2v. Fig. 9 shown.

[0054] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and the specification only describe the principles of the utility model. The utility model may be subject to various changes and improvements without departing from the spirit and scope of the utility model. These changes and improvements fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A transcranial electrical stimulation analyzer and its circuit, characterized in that: The apparatus comprises an analyzer body and an electrical stimulation circuit, wherein the analyzer body comprises a head cover and an electrode sheet, the electrical stimulation circuit is applicable to the analyzer body, the electrode sheet is arranged on the surface of the head cover, and the electrical stimulation circuit comprises: The main control unit is mainly composed of a clock circuit and a reset circuit, which is used to adjust the stimulation parameters and control other unit circuits; The regulating unit is mainly used as a positive and negative voltage source of a constant current source to adjust the output voltage and control the opening and closing of the power supply; The amplifier unit is mainly used as the core component circuit of the electrical stimulation, the HOW-LAND constant current source circuit, for realizing a transcranial electrical stimulation channel; The first reference unit is mainly used as a reference voltage source to determine the positive and negative standards of the output voltage; The charging unit is mainly used as a lithium battery charging circuit to power the lithium battery used for transcranial electrical stimulation; An impedance detection unit, used to convert the voltage output by the stimulation electrode; A second reference unit is used to provide a reference voltage to participate in the calculation; The main control unit includes a first single-chip microcomputer and a second single-chip microcomputer, a 28th pin of the first single-chip microcomputer is connected in series with a 14th resistor and grounded, a 10th resistor is connected in series between the 5th pin and the 6th pin of the first single-chip microcomputer, a 5th pin of the first single-chip microcomputer is connected in series with a 3rd capacitor, a 6th pin of the first single-chip microcomputer is connected in series with a 4th capacitor, one end of the 3rd capacitor and the 4th capacitor are both grounded, a 12th resistor is connected in series with the 7th pin of the first single-chip microcomputer, and a 6th capacitor is connected in series with the 7th pin of the first single-chip microcomputer, the 6th capacitor is connected in parallel with the first switch, and a 13th resistor of the second single-chip microcomputer is connected in series with an 11th resistor; The amplification unit includes a thirty-first single-chip microcomputer, a first pin of the thirty-first single-chip microcomputer is electrically connected to a sixty-fifth resistor and a sixty-seventh resistor, the sixty-fifth resistor is connected in parallel with an eighty-second capacitor, a second pin of the first single-chip microcomputer is connected in series with a sixty-third resistor, a third pin of the first single-chip microcomputer is connected in series with a sixty-fourth resistor and a sixty-sixth resistor, and the sixty-fourth resistor and the sixty-sixth resistor are connected in parallel.

2. A transcranial electrical stimulation analyzer and its circuit according to claim 1, characterized in that: The adjustment unit includes a twenty-seventh single-chip microcomputer, a first pin of the twenty-seventh single-chip microcomputer is electrically connected between the forty-seventh resistor and the forty-eighth resistor, the first pin of the twenty-seventh single-chip microcomputer is serially connected to the fifty-fifth capacitor, one end of the fifty-fifth capacitor away from the twenty-seventh single-chip microcomputer is electrically connected to the anode of the sixth diode, the cathode of the sixth diode is electrically connected to the anode of the seventh diode, the fifth pin of the twenty-seventh single-chip microcomputer is electrically connected to the forty-ninth resistor and one end of the fifty-eighth capacitor at the same time, one end of the fifty-eighth capacitor is electrically connected to the cathode of the eighth diode, the anode of the eighth diode is serially connected to the tenth inductor and is electrically connected to the sixth pin of the twenty-seventh single-chip microcomputer.

3. A transcranial electrical stimulation analyzer and circuit thereof according to claim 1, characterized in that: The first reference unit includes a forty-fifth single-chip microcomputer, a first pin and a second pin of the forty-fifth single-chip microcomputer are both electrically connected to one end of a ninety-first capacitor, the first pin of the forty-fifth single-chip microcomputer is also electrically connected to one end of a ninety-second capacitor, and a third pin of the forty-fifth single-chip microcomputer is serially connected to a ninety-third capacitor.

4. A transcranial electrical stimulation analyzer and circuit thereof according to claim 1, characterized in that: The charging unit includes a forty-sixth single-chip microcomputer, a first pin of the forty-sixth single-chip microcomputer is electrically connected to the one hundredth capacitor and the one hundred and first capacitor at the same time, a second pin of the forty-sixth single-chip microcomputer is electrically connected to one end of the one hundredth capacitor and is grounded, and a second pin of the forty-sixth single-chip microcomputer is electrically connected to the first pin of the second single-chip microcomputer.

5. A transcranial electrical stimulation analyzer and circuit thereof according to claim 1, characterized in that: The charging unit also includes a twelfth inductor, one end of the twelfth inductor is electrically connected to the one-hundred-and-second capacitor, one end of the one-hundred-and-second capacitor away from the twelfth inductor is electrically connected to the seventh pin of the forty-sixth single-chip microcomputer, and the eighth pin of the forty-sixth single-chip microcomputer is electrically connected between the twelfth inductor and the one-hundred-and-second capacitor.

6. A transcranial electrical stimulation analyzer and circuit thereof according to claim 1, characterized in that: The impedance detection unit includes a thirty-third single-chip microcomputer, a first pin of the thirty-third single-chip microcomputer is connected in series with a seventy-first resistor, a second pin of the thirty-third single-chip microcomputer is connected in series with a sixty-eighth resistor and is electrically connected to the first pin, a third pin of the thirty-third single-chip microcomputer is connected in series with a sixty-ninth resistor, a fifth pin of the thirty-third single-chip microcomputer is connected in series with a seventy-first resistor, a sixth pin of the thirty-third single-chip microcomputer is electrically connected to the seventy-third resistor and the eightieth resistor at the same time, and the eightieth resistor is connected in series with the seventy-second resistor and is electrically connected to the seventh pin of the thirty-third single-chip microcomputer.

7. A transcranial electrical stimulation analyzer and circuit thereof according to claim 1, characterized in that: The impedance detection unit is a hardware operation circuit, the same-direction input terminal of the operational amplifier is connected to the stimulation electrode pin, and the mathematical operation formula corresponding to the simplified circuit of the impedance detection unit is:

8. A transcranial electrical stimulation analyzer and circuit thereof according to claim 1, characterized in that: The second reference unit includes a thirty-second single-chip microcomputer. The chip used in the thirty-second single-chip microcomputer is the same as that of the forty-fifth single-chip microcomputer. The peripheral circuit structures of the thirty-second single-chip microcomputer and the forty-fifth single-chip microcomputer are similar.

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