Electrical stimulation circuit

Abstract

The invention discloses an electrical stimulation circuit. Relates to the field of electronic circuits and solves the problem of unstable electrical stimulation generated by an existing electrical stimulation scheme. Through the design of the transformer rectification filter circuit, the positive boost circuit and the negative boost circuit, the output of high-voltage and low-frequency electrical stimulation is realized, and the requirements of medical or treatment equipment on the electrical stimulation intensity and frequency are met. Through the design of the positive feedback control circuit and the negative feedback control circuit, the real-time monitoring and closed-loop control of the output voltage are realized, and the stability and accuracy of the circuit are improved. A switch tube in the booster circuit is controlled through the controller to achieve voltage boosting operation, a switch tube in the discharging circuit is controlled to achieve discharging operation of electrical stimulation, and the treatment effect and the comfort level of a patient are improved.

Description

Technical Field

[0001] The present application relates to the field of electronic circuits, and particularly to an electrical stimulation circuit. Background Art

[0002] The peak value of the conventional electrical stimulation voltage usually only reaches 50V or 80V, while the peak value of the high-voltage low-frequency electrical stimulation waveform can be as high as several hundred volts or even over a thousand volts. Therefore, the design of the high-voltage low-frequency power supply is completely different from that of the conventional electrical stimulation power supply.

[0003] The low voltage is raised to a high voltage by means of voltage multiplication rectification, and then the capacitor is charged by the high voltage, and then the capacitor is discharged through a power device. However, the biggest drawback of voltage multiplication rectification is that the power supply fluctuates greatly, resulting in power supply instability, which in turn affects the stability of the electrical stimulation output waveform and reduces the performance. The voltage is boosted by a transformer, and the number of turns of the primary and secondary coils of the transformer is changed to achieve the purpose of boosting. However, if a high output voltage value is to be achieved, the number of turns of the secondary coil must be increased, which will cause the volume of the transformer to increase and the occupied space to increase. When the transformer is used for low-frequency electrical stimulation, there is a problem that the rising edge of the waveform is prone to overshoot. A sharp waveform overshoot can be seen on the oscilloscope, which will bring a tingling sensation to the user and reduce the usage experience.

[0004] Therefore, how to solve the instability of the electrical stimulation generated by the existing electrical stimulation scheme is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0005] The purpose of the present application is to provide an electrical stimulation circuit to solve the problem of instability of the electrical stimulation generated by the existing electrical stimulation scheme.

[0006] To solve the above technical problems, the present application provides an electrical stimulation circuit, including: a transformer rectification and filtering circuit, a positive boosting circuit, a negative boosting circuit, a positive feedback control circuit, a negative feedback control circuit, a positive control discharge circuit, a negative control discharge circuit, a controller, and an electrode sheet;

[0007] The positive output terminal of the transformer rectification and filtering circuit is connected to the input terminal of the positive boosting circuit, and the negative output terminal of the transformer driving rectification and filtering circuit is connected to the input terminal of the negative boosting circuit; the output terminal of the positive boosting circuit is connected to the input terminal of the positive control discharge circuit and the input terminal of the positive feedback control circuit, and the output terminal and the control terminal of the positive feedback control circuit are connected to the controller; the output terminal of the negative boosting circuit is connected to the input terminal of the negative control discharge circuit and the input terminal of the negative feedback control circuit, and the output terminal and the control terminal of the negative feedback control circuit are connected to the controller; the output terminals of the positive control discharge circuit and the negative control discharge circuit are connected to the electrode sheet.

[0008] As an alternative, in the above-mentioned electrical stimulation circuit, the transformer rectification and filtering circuit includes: a transformer drive chip, a first transformer, a first diode, a second diode, a third diode, a fourth diode, a first capacitor, and a second capacitor; the first diode, the second diode, the third diode, and the fourth diode form a first rectifier bridge;

[0009] The control end of the transformer drive chip is connected to the controller, and the output end of the transformer drive chip is connected to the primary coil of the first transformer;

[0010] The first end of the first secondary coil of the first transformer and the first end of the second secondary coil of the first transformer are connected to the input end of the first rectifier bridge;

[0011] The first output end of the first rectifier bridge is connected to the first end of the first capacitor, the second output end of the first rectifier bridge is connected to the first end of the second capacitor, and the second end of the first capacitor is connected to the second end of the second capacitor and grounded;

[0012] The first end of the first capacitor serves as the positive output end, and the first end of the second capacitor serves as the negative output end.

[0013] As an alternative, in the above-mentioned electrical stimulation circuit, the forward boost circuit includes: a first inductor, a fifth diode, a third capacitor, a first transistor, and a first gate driver;

[0014] The first end of the first capacitor is connected to the first end of the first inductor, the second end of the first inductor is connected to the positive electrode of the fifth diode and the first end of the first transistor, and the second end of the second transistor is grounded; the input end of the first gate driver is connected to the first PWM signal output end of the controller, the output end of the first gate driver is connected to the control of the first transistor, the negative electrode of the fifth diode is connected to the first end of the third capacitor, and the second end of the third capacitor is grounded.

[0015] As an alternative, in the above-mentioned electrical stimulation circuit, the forward feedback control circuit includes: a first operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a fourth capacitor, a sixth diode, and a seventh diode;

[0016] The first end of the third capacitor is connected to the first end of the first resistor. The second end of the first resistor is connected to the first end of the second resistor, the first end of the fourth capacitor, and the negative input terminal of the first operational amplifier. The second end of the second resistor and the second end of the fourth capacitor are grounded. The second PWM signal output terminal of the controller is connected to the first end of the fourth resistor. The second end of the fourth resistor is connected to the first end of the fifth resistor and the positive input terminal of the first operational amplifier. The second end of the fifth resistor is grounded. The output terminal of the first operational amplifier is connected to the first end of the third resistor. The second end of the third resistor is connected to the anode of the sixth diode, the cathode of the seventh diode, and the positive feedback receiving terminal of the controller. The cathode of the sixth diode is connected to the power supply, and the anode of the seventh diode is grounded.

[0017] As an alternative solution, in the above electrical stimulation circuit, it further includes: an isolated power supply circuit; the isolated power supply circuit includes: a second transformer, a third transformer, a second rectifier bridge, a third rectifier bridge, a fourth rectifier bridge, a fifth capacitor, a sixth capacitor, and a seventh capacitor;

[0018] The second end of the first secondary coil of the first transformer is connected to the first end of the primary coil of the second transformer and the first end of the primary coil of the third transformer. The second end of the second secondary coil of the first transformer is connected to the second end of the primary coil of the second transformer and the second end of the primary coil of the third transformer;

[0019] The first end of the first secondary coil and the first end of the second secondary coil of the second transformer are connected to the first input terminal of the second rectifier bridge. The second end of the first secondary coil and the second end of the second secondary coil of the second transformer are connected to the second input terminal of the second rectifier bridge. The fifth capacitor is connected in parallel across the output terminals of the second rectifier bridge. The first end of the first secondary coil of the third transformer is connected to the first input terminal of the third rectifier bridge. The second end of the first secondary coil of the third transformer is connected to the second input terminal of the third rectifier bridge. The sixth capacitor is connected in parallel across the output terminals of the third rectifier bridge. The first end of the second secondary coil of the third transformer is connected to the first input terminal of the fourth rectifier bridge. The second end of the second secondary coil of the third transformer is connected to the second input terminal of the fourth rectifier bridge. The seventh capacitor is connected in parallel across the output terminals of the fourth rectifier bridge;

[0020] The two output terminals of the second rectifier bridge serve as the first voltage output terminal. The two output terminals of the third rectifier bridge serve as the second voltage output terminal. The two output terminals of the fourth rectifier bridge serve as the third voltage output terminal.

[0021] As an alternative, in the above-mentioned electrical stimulation circuit, the forward control discharge circuit includes: a second transistor, a sixth resistor, a seventh resistor, a first isolation gate driver, and a first triode;

[0022] The forward switch control terminal of the controller is connected to the control terminal of the first triode. The emitter of the first triode is grounded. The collector of the first triode is connected to the input terminal of the first isolation gate driver. The output terminal of the first isolation gate driver is connected to the first end of the sixth resistor. The second end of the sixth resistor is connected to the control terminal of the second transistor and the first end of the seventh resistor. The first end of the second transistor is connected to the first end of the third capacitor. The second end of the second transistor is connected to the second end of the seventh resistor and the second power supply terminal of the first isolation gate driver. The second end of the second transistor is connected to the electrode plate. The first power supply terminal of the first isolation gate driver is connected to the first end of the first voltage output terminal. The second power supply terminal of the first isolation gate driver is connected to the second end of the first voltage output terminal.

[0023] As an alternative, in the above-mentioned electrical stimulation circuit, the negative boost circuit includes: a second inductor, an eighth diode, a third transistor, an eighth resistor, a ninth resistor, an eighth capacitor, a ninth capacitor, and a second isolation gate driver;

[0024] The first end of the second capacitor is connected to the first end of the second inductor. The third PWM signal output terminal of the controller is connected to the input terminal of the second isolation gate driver. The first power supply terminal of the second isolation gate driver is connected to the first end of the second voltage output terminal, the first end of the eighth capacitor. The second power supply terminal of the second isolation gate driver is connected to the second end of the second voltage output terminal, the second end of the eighth capacitor, the first end of the ninth resistor, the second end of the second inductor, the first end of the third transistor, and the negative electrode of the eighth diode. The output terminal of the second isolation gate driver is connected to the second end of the ninth resistor and the control terminal of the third transistor through the eighth resistor. The second end of the third transistor is grounded. The positive electrode of the eighth diode is connected to the first end of the ninth capacitor. The second end of the ninth capacitor is grounded.

[0025] As an alternative, in the above-mentioned electrical stimulation circuit, the negative feedback control circuit includes: a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a ninth diode, a twelfth diode, a second operational amplifier, and a third operational amplifier;

[0026] The second terminal of the ninth capacitor is connected to the negative input terminal of the third operational amplifier and the output terminal of the second operational amplifier through the tenth resistor; the fourth PWM signal output terminal of the controller is connected to the first terminal of the eleventh resistor, the second terminal of the eleventh resistor is connected to the first terminal of the twelfth resistor and the positive input terminal of the second operational amplifier, the second terminal of the twelfth resistor is grounded, the negative input terminal and the output terminal of the second operational amplifier are connected, the positive input terminal of the third operational amplifier is grounded, the output terminal of the third operational amplifier is connected to the anode of the ninth diode, the cathode of the twelfth diode and the negative feedback receiving terminal of the controller through the thirteenth resistor, the cathode of the ninth diode is connected to the power supply, and the anode of the twelfth diode is grounded.

[0027] As an alternative solution, in the above electrical stimulation circuit, the negative control discharge circuit includes: a second triode, a third isolation gate driver, a fourth transistor, a fourteenth resistor, a fifteenth resistor, and a tenth capacitor;

[0028] The negative switch control terminal of the controller is connected to the control terminal of the second triode, the emitter of the second triode is grounded, the collector of the second triode is connected to the input terminal of the third isolation gate driver, the output terminal of the third isolation gate driver is connected to the first terminal of the fifteenth resistor, the second terminal of the fifteenth resistor is connected to the first terminal of the fourteenth resistor and the control terminal of the fourth transistor, the first terminal of the fourth transistor is connected to the second terminal of the third voltage output terminal, the second terminal of the fourteenth resistor, the second power supply terminal of the third isolation gate driver, and the first terminal of the tenth capacitor, and the second terminal of the tenth capacitor is connected to the first power supply terminal of the third isolation gate driver and the first terminal of the third voltage output terminal.

[0029] As an alternative solution, the above electrical stimulation circuit further includes a first low-pass filter circuit;

[0030] The positive input terminal of the first operational amplifier is connected to the fourth resistor through the first low-pass filter circuit.

[0031] The electrical stimulation circuit provided by this application includes: a transformer rectifier filter circuit, a positive boost circuit, a negative boost circuit, a positive feedback control circuit, a negative feedback control circuit, a positive control discharge circuit, a negative control discharge circuit, a controller, and electrode pads; the positive output terminal of the transformer rectifier filter circuit is connected to the input terminal of the positive boost circuit, and the negative output terminal of the transformer drive rectifier filter circuit is connected to the input terminal of the negative boost circuit; the output terminal of the positive boost circuit is connected to the input terminal of the positive control discharge circuit and the input terminal of the positive feedback control circuit, and the output terminal and the control terminal of the positive feedback control circuit are connected to the controller; the output terminal of the negative boost circuit is connected to the input terminal of the negative control discharge circuit and the input terminal of the negative feedback control circuit, and the output terminal and the control terminal of the negative feedback control circuit are connected to the controller; the output terminals of the positive control discharge circuit and the negative control discharge circuit are connected to the electrode pads. Through the design of the transformer rectifier filter circuit, the positive boost circuit, and the negative boost circuit, this application realizes the output of high-voltage and low-frequency electrical stimulation, meeting the requirements of medical or therapeutic devices for the intensity and frequency of electrical stimulation. Through the design of the positive feedback control circuit and the negative feedback control circuit, the real-time monitoring and closed-loop control of the output voltage are realized, improving the stability and accuracy of the circuit. By controlling the switching tubes in the boost circuit through the controller, the voltage boosting operation is realized, and by controlling the switching tubes in the discharge circuit, the discharge operation of electrical stimulation is realized, improving the therapeutic effect and the comfort of patients. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] To more clearly illustrate the embodiments of this application, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0033] Figure 1 Schematic diagram of an electrical stimulation circuit provided by an embodiment of this application;

[0034] Figure 2 Circuit diagram of a transformer rectifier filter circuit provided by an embodiment of this application;

[0035] Figure 3 Circuit diagram of a positive electrical stimulation drive control provided by an embodiment of this application;

[0036] Figure 4 Circuit diagram of an isolated power supply circuit provided by an embodiment of this application;

[0037] Figure 5 Circuit diagram of a negative electrical stimulation drive control provided by an embodiment of this application.

[0038] REFERENCE NUMERALS:

[0039] 11 - Transformer rectifier filter circuit, 12 - Positive boost circuit, 13 - Negative boost circuit, 14 - Positive feedback control circuit, 15 - Negative feedback control circuit, 16 - Positive control discharge circuit, 17 - Negative control discharge circuit, 18 - Controller, 19 - Electrode plate. Specific embodiments

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present application.

[0041] The core of the present application is to provide an electrical stimulation circuit.

[0042] To enable those skilled in the art to better understand the solution of the present application, the following further detailed description of the present application will be given in conjunction with the accompanying drawings and specific embodiments.

[0043] The electrical stimulation circuit of this embodiment is applicable to medical or therapeutic devices that require high - voltage and low - frequency electrical stimulation, especially in occasions where precise control of the intensity and time of electrical stimulation is needed, such as nerve stimulation, muscle stimulation, pain treatment, etc.

[0044] To solve the above problems, the embodiments of the present application provide an electrical stimulation circuit, as Figure 1 shown, including: transformer rectifier filter circuit 11, positive boost circuit 12, negative boost circuit 13, positive feedback control circuit 14, negative feedback control circuit 15, positive control discharge circuit 16, negative control discharge circuit 17, controller 18, electrode plate 19;

[0045] The positive output terminal of the transformer rectifier filter circuit 11 is connected to the input terminal of the positive boost circuit 12, and the negative output terminal of the transformer drive rectifier filter circuit is connected to the input terminal of the negative boost circuit 13; the output terminal of the positive boost circuit 12 is connected to the input terminal of the positive control discharge circuit 16 and the input terminal of the positive feedback control circuit 14, and the output terminal and control terminal of the positive feedback control circuit 14 are connected to the controller 18; the output terminal of the negative boost circuit 13 is connected to the input terminal of the negative control discharge circuit 17 and the input terminal of the negative feedback control circuit 15, and the output terminal and control terminal of the negative feedback control circuit 15 are connected to the controller 18; the output terminals of the positive control discharge circuit 16 and the negative control discharge circuit 17 are connected to the electrode plate 19.

[0046] The transformer rectifier and filter circuit 11 refers to the circuit part that converts the input AC voltage into a stable DC voltage through transformer voltage transformation, rectifier rectification, and filter filtering. Specifically, it can be a circuit composed of a transformer, a rectifier bridge, filter capacitors, etc.

[0047] The positive boost circuit 12 and the negative boost circuit 13 are the circuit parts that boost the DC voltage to a positive high voltage and a negative high voltage respectively. It can be a DC-DC (direct current - direct current) boost circuit composed of switching tubes (metal - oxide semiconductor field - effect transistors), boost inductors, energy storage capacitors, etc. The specific circuit structure of this embodiment is not limited and can be set according to actual needs.

[0048] In the boost circuit, there is an inductor for storing energy and releasing energy when the switching tube is turned off to increase the output voltage. Specifically, it can be a ferrite inductor, an I - shaped inductor, etc. Preferably, an inductor with high inductance, low loss, and small volume should be selected. There is also a capacitor for storing the electric energy after boosting and releasing it to the load when needed. Specifically, it can be an electrolytic capacitor, a ceramic capacitor, etc.

[0049] Specifically, the controller 18 can adjust the duty cycle of the switching tube by controlling the control signal output to the switching tube in the boost circuit, thereby controlling the output voltage. For example, the PWM (pulse - width modulation) signal can specifically be a high - frequency, low - duty - cycle square - wave signal. The controller 18 controls the switching tube in the boost circuit to boost the input voltage to a preset positive high voltage or negative high voltage. Then, by controlling the switching tube in the discharge circuit, the electric energy in the energy storage capacitor is discharged through the electrode plate 19 to generate an electric stimulation.

[0050] The positive feedback control circuit 14 and the negative feedback control circuit 15 refer to the circuit parts that respectively monitor the output voltages of the positive boost circuit 12 and the negative boost circuit 13 and transmit the feedback signals to the controller 18. Specifically, it can be a feedback circuit composed of operational amplifiers, voltage - dividing resistors, comparators, etc. The specific circuit structure of this embodiment is not limited and can be set according to actual needs.

[0051] The positive control discharge circuit 16 and the negative control discharge circuit 17 are the circuit parts that respectively control the discharge of the positive high voltage and the negative high voltage through the electrode plate 19 under the control of the controller 18. Specifically, it can be a discharge circuit composed of switching tubes, discharge resistors, etc.

[0052] The controller 18 is responsible for receiving the feedback signal and adjusting the working states of the boost circuit and the discharge circuit according to a preset program or algorithm. Specifically, it can be an intelligent control circuit composed of a microcontroller 18, a program memory, a data memory, etc. The microcontroller is specifically a microcontroller unit (MCU).

[0053] The electrode piece 19 is a conductive piece that contacts the human body and transmits electrical stimulation to the target. The electrode piece 19 can be made of materials such as metal or conductive rubber.

[0054] The electrical stimulation circuit provided by the embodiment of the present application includes: a transformer rectifier filter circuit 11, a positive boost circuit 12, a negative boost circuit 13, a positive feedback control circuit 14, a negative feedback control circuit 15, a positive control discharge circuit 16, a negative control discharge circuit 17, a controller 18, and an electrode piece 19; the positive output terminal of the transformer rectifier filter circuit 11 is connected to the input terminal of the positive boost circuit 12, and the negative output terminal of the transformer drive rectifier filter circuit is connected to the input terminal of the negative boost circuit 13; the output terminal of the positive boost circuit 12 is connected to the input terminal of the positive control discharge circuit 16 and the input terminal of the positive feedback control circuit 14, and the output terminal and the control terminal of the positive feedback control circuit 14 are connected to the controller 18; the output terminal of the negative boost circuit 13 is connected to the input terminal of the negative control discharge circuit 17 and the input terminal of the negative feedback control circuit 15, and the output terminal and the control terminal of the negative feedback control circuit 15 are connected to the controller 18; the output terminals of the positive control discharge circuit 16 and the negative control discharge circuit 17 are connected to the electrode piece 19. Through the design of the transformer rectifier filter circuit 11, the positive boost circuit 12, and the negative boost circuit 13 in the present application, the output of high-voltage and low-frequency electrical stimulation is realized, meeting the requirements of medical or therapeutic devices for the intensity and frequency of electrical stimulation. Through the design of the positive feedback control circuit 14 and the negative feedback control circuit 15, the real-time monitoring and closed-loop control of the output voltage are realized, improving the stability and accuracy of the circuit. By controlling the switching tubes in the boost circuit through the controller 18, the voltage boosting operation is realized, and by controlling the switching tubes in the discharge circuit, the discharge operation of electrical stimulation is realized, improving the therapeutic effect and the comfort of the patient.

[0055] According to the above embodiment, in a specific embodiment, Figure 2 is a circuit diagram of a transformer rectifier filter circuit provided by the embodiment of the present application, as Figure 2 shown, the transformer rectifier filter circuit 11 includes: a transformer drive chip U1, a first transformer T1, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a first capacitor C1, and a second capacitor C2; the first diode D1, the second diode D2, the third diode D3, and the fourth diode D4 form a first rectifier bridge 21;

[0056] The control terminal of the transformer drive chip U1 is connected to the controller 18, and the output terminal of the transformer drive chip U1 is connected to the primary coil of the first transformer T1;

[0057] The first end of the first secondary coil of the first transformer T1 and the first end of the second secondary coil of the first transformer T1 are connected to the input end of the first rectifier bridge 21;

[0058] The first output end of the first rectifier bridge 21 is connected to the first end of the first capacitor C1, the second output end of the first rectifier bridge 21 is connected to the first end of the second capacitor C2, and the second end of the first capacitor C1 and the second end of the second capacitor C2 are connected and grounded;

[0059] The first end of the first capacitor C1 serves as the positive output terminal (+VCC), and the first end of the second capacitor C2 serves as the negative output terminal (-VCC).

[0060] In this embodiment, the control terminal of the transformer drive chip U1 is connected to the controller 18 (IO1, IO2) to receive the control signal from the controller 18 for driving the first transformer T1 to operate. This chip can specifically be a dedicated drive chip with high integration, strong driving ability, high control precision, etc.

[0061] The first transformer T1 transforms the input AC voltage into the required voltage level. Its primary coil is connected to the output end of the transformer drive chip U1 to receive the drive signal; the first secondary coil and the second secondary coil are used to output the transformed voltage.

[0062] The first diode D1, the second diode D2, the third diode D3, and the fourth diode D4 form the first rectifier bridge 21 for rectifying the AC voltage output by the first transformer T1 into a DC voltage. The design of the rectifier bridge ensures the polarity and stability of the output voltage. The first capacitor C1 and the second capacitor C2 are used as filter capacitors and are respectively connected to the output end of the first rectifier bridge 21 to smooth the rectified DC voltage, reduce voltage fluctuations, and improve the stability of the output voltage.

[0063] In this embodiment, the transformer drive chip U1 receives the control signal from the controller 18 and drives the first transformer T1 to operate to achieve the transformation of the AC voltage. The first rectifier bridge 21 rectifies the AC voltage output by the first transformer T1 into a DC voltage. The first capacitor C1 and the second capacitor C2 filter the rectified DC voltage to obtain a stable DC power supply output. It realizes the precise control of the transformer operation, ensures the stability and reliability of the output voltage, and provides the required DC power supply for the subsequent circuit.

[0064] According to the above embodiment, in a specific embodiment, Figure 3 This is a circuit diagram of a positive electrical stimulation drive control provided by an embodiment of the present application. As Figure 3 shown, the positive boost circuit 12 includes: a first inductor L1, a fifth diode D5, a third capacitor C3, a first transistor Q1, and a first gate driver U2;

[0065] The first end of the first capacitor C1 is connected to the first end of the first inductor L1. The second end of the first inductor L1 is connected to the positive electrode of the fifth diode D5 and the first end of the first transistor Q1. The second end of the second transistor Q2 is grounded. The input end of the first gate driver U2 is connected to the first PWM signal output end (IO3) of the controller 18. The output end of the first gate driver U2 is connected to the control end of the first transistor Q1. The negative electrode of the fifth diode D5 is connected to the first end of the third capacitor C3, and the second end of the third capacitor C3 is grounded.

[0066] The first end of the first inductor L1 is connected to the first end of the previously described first capacitor C1 (i.e., +VCC), serving as the input end of the boost circuit. The second end of the first inductor L1 is simultaneously connected to the positive electrode of the fifth diode D5 and the first end of the first transistor Q1 (usually the collector, depending on the transistor type). The second end of the first transistor Q1 (usually the emitter) is grounded, forming the return path of the circuit.

[0067] The input end of the first gate driver U2 receives the first PWM (pulse width modulation) signal from the controller 18, and its output end is connected to the control end (base or gate) of the first transistor Q1 to control the switching state of the transistor.

[0068] The negative electrode of the fifth diode D5 is connected to the first end of the third capacitor C3, serving as the output end of the boost circuit to provide an elevated positive voltage. The second end of the third capacitor C3 is grounded to stabilize the output voltage and reduce ripple.

[0069] When the controller 18 enables the first gate driver U2 to drive the first transistor Q1 to conduct through the first PWM signal, the current flows from +VCC through the first inductor L1 to the first transistor Q1 and then to the ground. At this time, the inductor L1 stores energy.

[0070] When the first transistor Q1 is turned off, due to the self-inductance effect of the inductor, the inductor L1 attempts to maintain its current unchanged, so a relatively high reverse voltage will be generated across it. This reverse voltage is superimposed on +VCC and charges the third capacitor C3 through the fifth diode D5, thereby making the voltage across the third capacitor C3 higher than +VCC, achieving voltage boost.

[0071] The third capacitor C3 serves as an energy storage element to provide a stable positive high-voltage power supply for the subsequent circuit.

[0072] In this embodiment, the switching of the transistor is controlled by the PWM signal, realizing the energy storage and release of the inductor, thereby efficiently boosting the input voltage to the required level. By adjusting the duty cycle of the PWM signal, the magnitude of the output voltage can be precisely controlled to meet the requirements of different application scenarios.

[0073] According to the above embodiments, in a specific embodiment, the positive feedback control circuit 14 includes: a first operational amplifier U3, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a fourth capacitor C4, a sixth diode D6, and a seventh diode D7;

[0074] A first end of the third capacitor C3 is connected to a first end of the first resistor R1. A second end of the first resistor R1 is connected to a first end of the second resistor R2, a first end of the fourth capacitor C4, and a negative input terminal of the first operational amplifier U3. A second end of the second resistor R2 and a second end of the fourth capacitor C4 are grounded. A second PWM signal output terminal (IO4) of the controller 18 is connected to a first end of the fourth resistor R4. A second end of the fourth resistor R4 is connected to a first end of the fifth resistor R5 and a positive input terminal of the first operational amplifier U3. A second end of the fifth resistor R5 is grounded. An output terminal of the first operational amplifier U3 is connected to a first end of the third resistor R3. A second end of the third resistor R3 is connected to a positive electrode of the sixth diode D6, a negative electrode of the seventh diode D7, and a positive feedback receiving terminal (IO5) of the controller 18. A negative electrode of the sixth diode D6 is connected to a power supply, and a positive electrode of the seventh diode D7 is grounded.

[0075] In this embodiment, the negative input terminal of the operational amplifier is connected to the output terminal of the boost circuit (i.e., the first end of the third capacitor C3) through a series of resistors and capacitors, and is used to receive and amplify the output signal of the boost circuit. The positive input terminal of the operational amplifier is connected to the second PWM signal output terminal of the controller 18 through a resistor, and at the same time, this terminal is also grounded through another resistor to form a reference potential.

[0076] The output terminal of the operational amplifier is connected to the positive and negative electrodes of two diodes through a resistor, and at the same time, these two diodes are also respectively connected to the power supply and the ground, constituting a feedback path.

[0077] The positive feedback receiving terminal of the controller 18 is connected to the output terminal of the operational amplifier through a diode, and is used to receive and process the feedback signal.

[0078] After the output signal of the boost circuit passes through the filtering effect of the resistor and the capacitor, it is received and amplified by the operational amplifier. This amplified signal reflects the current working state of the boost circuit. The amplified signal is sent back to the positive feedback receiving terminal of the controller 18 through the feedback path formed by the diodes. This feedback signal is superimposed on the original output signal of the controller 18 to form a closed-loop control system. The controller 18 dynamically adjusts the duty cycle or frequency of the PWM signal it outputs according to the received feedback signal, so as to achieve precise control of the output voltage or current of the boost circuit.

[0079] By introducing the positive feedback control circuit 14, precise control of the output voltage or current of the boost circuit can be achieved, with fast response speed and high control accuracy. The introduction of the closed-loop control system improves the stability of the entire circuit. When the output of the boost circuit fluctuates, the feedback signal can quickly feedback this fluctuation to the controller 18, enabling it to adjust the output in a timely manner, thereby maintaining the stability of the output voltage or current.

[0080] According to the above embodiments, in a specific embodiment, Figure 4 The circuit diagram of an isolated power supply circuit provided by an embodiment of the present application is as Figure 4 shown, and further includes: an isolated power supply circuit; the isolated power supply circuit includes: a second transformer T2, a third transformer T3, a second rectifier bridge 22, a third rectifier bridge 23, a fourth rectifier bridge 24, a fifth capacitor C5, a sixth capacitor C6, and a seventh capacitor C7;

[0081] The second end PWR_L_P of the first secondary coil of the first transformer T1 is connected to the first end of the primary coil of the second transformer T2 and the first end of the primary coil of the third transformer T3, and the second end PWR_L_N of the second secondary coil of the first transformer T1 is connected to the second end of the primary coil of the second transformer T2 and the second end of the primary coil of the third transformer T3;

[0082] The first end of the first secondary coil and the first end of the second secondary coil of the second transformer T2 are connected to the first input terminal of the second rectifier bridge 22, the second end of the first secondary coil and the second end of the second secondary coil of the second transformer T2 are connected to the second input terminal of the second rectifier bridge 22, and the fifth capacitor C5 is connected in parallel across the output terminals of the second rectifier bridge 22; the first end of the first secondary coil of the third transformer T3 is connected to the first input terminal of the third rectifier bridge 23, the second end of the first secondary coil of the third transformer T3 is connected to the second input terminal of the third rectifier bridge 23, and the sixth capacitor C6 is connected in parallel across the output terminals of the third rectifier bridge 23; the first end of the second secondary coil of the third transformer T3 is connected to the first input terminal of the fourth rectifier bridge 24, the second end of the second secondary coil of the third transformer T3 is connected to the second input terminal of the fourth rectifier bridge 24, and the seventh capacitor C7 is connected in parallel across the output terminals of the fourth rectifier bridge 24;

[0083] The two output terminals (PHvOut, HvOut) of the second rectifier bridge 22 serve as the first voltage output terminals, the two output terminals (P-HvGn, -HvGn) of the third rectifier bridge 23 serve as the second voltage output terminals, and the two output terminals (P-HV, -HV) of the fourth rectifier bridge 24 serve as the third voltage output terminals.

[0084] This embodiment is mainly to provide an isolated power supply circuit to supply power to the subsequent isolated gate driver.

[0085] The secondary pins of the second transformer T2 and the third transformer T3 are connected to the first transformer T1. After passing through the second rectifier bridge 22 and the fifth capacitor C5, the voltage value of the second transformer T2 is stabilized at PHvOut, and HvOut is the reference level point of the voltage PHvOut.

[0086] After passing through the third rectifier bridge 23 and the sixth capacitor C6, the output terminal of the first secondary coil of the third transformer T3 has a stabilized voltage value of P-HvGn, and -HvGn is the reference level point of the voltage P-HvGn.

[0087] After passing through the fourth rectifier bridge 24 and the seventh capacitor C7, the output terminal of the second secondary coil of the third transformer T3 has a stabilized voltage value of P-HV, and -HV is the reference level point of the voltage P-HV.

[0088] Electrical isolation between the input and the output is achieved through the transformers, providing three independent isolated DC voltage outputs to meet the power supply voltage requirements of different circuits or devices.

[0089] According to the above embodiments, in a specific embodiment, the forward control discharge circuit 16 includes: a second transistor Q2, a sixth resistor R6, a seventh resistor R7, a first isolation gate driver W1, and a first triode VT1;

[0090] The forward switch control terminal (IO6) of the controller 18 is connected to the control terminal of the first triode VT1. The emitter of the first triode VT1 is grounded, the collector of the first triode VT1 is connected to the input terminal of the first isolation gate driver W1, the output terminal of the first isolation gate driver W1 is connected to the first end of the sixth resistor R6, the second end of the sixth resistor R6 is connected to the control terminal of the second transistor Q2 and the first end of the seventh resistor R7, the first end of the second transistor Q2 is connected to the first end of the third capacitor C3, the second end of the second transistor Q2 is connected to the second end of the seventh resistor R7 and the second power supply terminal of the first isolation gate driver W1; the second end of the second transistor Q2 is connected to the electrode plate 19, the first power supply terminal of the first isolation gate driver W1 is connected to the first end of the first voltage output terminal, and the second power supply terminal of the first isolation gate driver W1 is connected to the second end of the first voltage output terminal.

[0091] In this embodiment, the second transistor Q2 is used to control the switch of the discharge process, and the sixth resistor R6 and the seventh resistor R7 are used for current limiting and voltage division.

[0092] The first isolation gate driver W1 is used to enhance the control signal and drive the transistor.

[0093] The first triode VT1 serves as an amplification and switching element for the control signal. The forward switch control terminal of the controller 18 is connected to the control terminal (base) of the first triode VT1 to control the switching state of the triode. The emitter of the first triode VT1 is grounded, and the collector is connected to the input terminal of the first isolation gate driver W1. When the triode conducts, a control signal is input to the isolation gate driver. The controller 18 controls the conduction and cutoff of the second transistor Q2 by controlling the level of the gate voltage.

[0094] When the controller 18 outputs a forward switch control signal, the first triode VT1 conducts, and a control signal is input to the isolation gate driver. The output terminal of the isolation gate driver drives the second transistor Q2 to conduct through the sixth resistor R6. At this time, the current flows from the source to the drain through the second transistor Q2 and is output to the load through the electrode plate 19 to achieve the discharge process. The resistors and capacitors play roles of current limiting, voltage dividing, and filtering in the circuit to ensure the stable operation of the circuit. The switching state of the discharge circuit can be flexibly controlled through the forward switch control terminal of the controller 18.

[0095] According to the above embodiments, in a specific embodiment, Figure 5 is a circuit diagram of a negative electrical stimulation driving control provided by an embodiment of the present application. As Figure 5 shown, the negative boost circuit 13 includes: a second inductor L2, an eighth diode D8, a third transistor Q3, an eighth resistor R8, a ninth resistor R9, an eighth capacitor C8, a ninth capacitor C9, and a second isolation gate driver W2;

[0096] The first end of the second capacitor C2 is connected to the first end of the second inductor L2; the third PWM signal output terminal IO7 of the controller 18 is connected to the input terminal of the second isolation gate driver W2. The first power supply terminal of the second isolation gate driver W2 is connected to the first end of the second voltage output terminal and the first end of the eighth capacitor C8. The second power supply terminal of the second isolation gate driver W2 is connected to the second end of the second voltage output terminal, the second end of the eighth capacitor C8, the first end of the ninth resistor R9, the second end of the second inductor L2, the first end of the third transistor Q3, and the negative electrode of the eighth diode D8; the output terminal of the second isolation gate driver W2 is connected to the second end of the ninth resistor R9 and the control terminal of the third transistor Q3 through the eighth resistor R8. The second end of the third transistor Q3 is grounded, and the positive electrode of the eighth diode D8 is connected to the first end of the ninth capacitor C9, and the second end of the ninth capacitor C9 is grounded.

[0097] The second inductor L2 stores and releases energy in the circuit to help achieve voltage increase.

[0098] The PWM signal is output from the controller 18 to IO7, passes through the output pin 5 of the second isolation gate driver W2, is connected to the eighth resistor R8, and then connected to the gate of the third transistor Q3 (specifically an N-channel MOS transistor). The ninth resistor R9 is connected across the gate and drain of the transistor to ensure a definite state of the gate when the MOS transistor is turned off. The second isolation gate driver W2 is used to drive the MOS transistor because the control power supply of the controller 18 is at a low voltage, while the part controlled by the MOS transistor is at a high voltage, and isolation between the high voltage and the low voltage is required. Therefore, an isolation gate drive is adopted to drive the MOS transistor. The controller 18 can output a PWM signal through the IO7 port to control the drive gate and charge the ninth capacitor C9. If the voltage of the ninth capacitor C9 reaches the expected value, the voltage on the ninth capacitor C9 can be discharged by controlling the negative feedback control circuit 15, and then the electrode plate 19 can be reached to achieve the purpose of electrical stimulation.

[0099] The PWM signal output by the controller 18 can control the operating frequency and duty cycle of the boost circuit, thereby adjusting the magnitude of the output voltage. Circuit parameters such as inductance, capacitance value, resistance value, etc. can be adjusted according to specific requirements to adapt to different application scenarios.

[0100] According to the above embodiments, in a specific embodiment, the negative feedback control circuit 15 includes: a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a ninth diode D9, a twelfth diode D10, a second operational amplifier U4, and a third operational amplifier U5;

[0101] The second terminal of the ninth capacitor C9 is connected to the negative input terminal of the third operational amplifier U5 and the output terminal of the second operational amplifier U4 through the tenth resistor R10; the fourth PWM signal output terminal IO8 of the controller 18 is connected to the first terminal of the eleventh resistor R11, the second terminal of the eleventh resistor R11 is connected to the first terminal of the twelfth resistor R12 and the positive input terminal of the second operational amplifier U4, the second terminal of the twelfth resistor R12 is grounded, the negative input terminal of the second operational amplifier U4 is connected to the output terminal, the positive input terminal of the third operational amplifier U5 is grounded, the output terminal of the third operational amplifier U5 is connected to the positive electrode of the ninth diode D9, the negative electrode of the twelfth diode D10, and the negative feedback receiving terminal IO9 of the controller 18 through the thirteenth resistor R13, the negative electrode of the ninth diode D9 is connected to the power supply, and the positive electrode of the twelfth diode D10 is grounded.

[0102] The IO8 port is connected to the MCU side and outputs a PWM signal. After being divided by the eleventh resistor R11 and the twelfth resistor R12, it can be converted into a DC level after passing through the RC low-pass filter 32, and the DC level is input to the positive input terminal of the second operational amplifier U4. The negative input terminal of the second operational amplifier U4 is connected to the output pin to form a follower. The output voltage value is connected to the negative input terminal of the third operational amplifier U5 through a resistor. The negative voltage value -HV is divided. The positive input terminal of the third operational amplifier U5 is connected to GND. The output voltage value of the third operational amplifier U5 passes through the thirteenth resistor R13 for current limiting and is clamped and protected by the ninth diode D9 and the twelfth diode D10. IO9 is connected to the ADC port of the MCU, and the size of the current -HV voltage value is judged by the size of the ADC voltage value.

[0103] According to the above embodiment, in a specific embodiment, the negative control discharge circuit 17 includes: a second triode VT2, a third isolation gate driver W3, a fourth transistor Q4, a fourteenth resistor R14, a fifteenth resistor R15, and a tenth capacitor C10;

[0104] The negative switch control terminal of the controller 18 is connected to the control terminal of the second triode VT2. The emitter of the second triode VT2 is grounded. The collector of the second triode VT2 is connected to the input terminal of the third isolation gate driver W3. The output terminal of the third isolation gate driver W3 is connected to the first end of the fifteenth resistor R15. The second end of the fifteenth resistor R15 is connected to the first end of the fourteenth resistor R14 and the control terminal of the fourth transistor Q4. The first end of the fourth transistor Q4 is connected to the second end of the third voltage output terminal, the second end of the fourteenth resistor R14, the second power supply terminal of the third isolation gate driver W3, and the first end of the tenth capacitor C10. The second end of the tenth capacitor C10 is connected to the first power supply terminal of the third isolation gate driver W3 and the first end of the third voltage output terminal.

[0105] Negative voltage discharge is carried out by controlling the switch of the fourth transistor Q4. The gate of the fourth transistor Q4 is isolated and driven by the third isolation gate driver W3. Pin 3 of the third isolation gate driver W3 is connected to the second triode VT2Q6. The output of the IO10 port is controlled by the controller 18 to control the high and low of the output level of the isolation gate drive chip. When the output is high, the second triode VT2 conducts, making pins 1 and 3 of the third isolation gate driver W3 conduct, and then making the output terminal of pin 5 output high level. The high level is connected to the gate of the fourth transistor Q4, and the fourth transistor Q4 conducts. Pin 6 of the third isolation gate driver W3 is connected to the voltage value P-HV output by the transformer TR2, and pin 4 of the third isolation gate driver W3 is connected to the reference voltage value -HV output by the transformer TR2.

[0106] According to the above embodiments, in a specific embodiment, a first low-pass filter circuit 31 is further included;

[0107] The positive input terminal of the first operational amplifier U3 is connected to the fourth resistor R4 through the first low-pass filter circuit 31.

[0108] Similarly, the positive input terminal of the second operational amplifier U4 is also connected to the eleventh resistor R11 through the second low-pass filter circuit 32.

[0109] The above has introduced the provided electrical stimulation circuit in detail. Each embodiment in the specification is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple. For the relevant parts, reference can be made to the description in the method part. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

[0110] It should also be noted that in this specification, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including an..." does not exclude the existence of another identical element in the process, method, article or device including the said element.

Claims

1. An electrical stimulation circuit, characterized in that: include: Transformer rectifier filter circuit (11), positive boost circuit (12), negative boost circuit (13), positive feedback control circuit (14), negative feedback control circuit (15), positive control discharge circuit (16), negative control discharge circuit (17), controller (18), electrode sheet (19); The positive output end of the transformer rectifier filter circuit (11) is connected to the input end of the positive boost circuit (12), and the negative output end of the transformer drive rectifier filter circuit is connected to the input end of the negative boost circuit (13); the output end of the positive boost circuit (12) is connected to the input end of the positive control discharge circuit (16) and the input end of the positive feedback control circuit (14), and the output end and the control end of the positive feedback control circuit (14) are connected to the controller (18); the output end of the negative boost circuit (13) is connected to the input end of the negative control discharge circuit (17) and the input end of the negative feedback control circuit (15), and the output end and the control end of the negative feedback control circuit (15) are connected to the controller (18); the output end of the positive control discharge circuit (16) and the output end of the negative control discharge circuit (17) are connected to the electrode sheet (19).

2. The electrical stimulation circuit according to claim 1, characterized in that: The transformer rectifier filter circuit (11) comprises: a transformer driver chip, a first transformer, a first diode, a second diode, a third diode, a fourth diode, a first capacitor, and a second capacitor; the first diode, the second diode, the third diode, and the fourth diode constitute a first rectifier bridge; The control end of the transformer driving chip is connected to the controller (18), and the output end of the transformer driving chip is connected to the primary coil of the first transformer; A first end of the first secondary coil of the first transformer and a first end of the second secondary coil of the first transformer are connected to an input end of the first rectifier bridge; The first output end of the first rectifier bridge is connected to the first end of the first capacitor, the second output end of the first rectifier bridge is connected to the first end of the second capacitor, and the second end of the first capacitor is connected to the second end of the second capacitor and is grounded; The first end of the first capacitor serves as a positive output end, and the first end of the second capacitor serves as a negative output end.

3. The electrical stimulation circuit according to claim 2, characterized in that: The forward boost circuit (12) comprises: a first inductor, a fifth diode, a third capacitor, a first transistor, and a first gate driver; The first end of the first capacitor is connected to the first end of the first inductor, the second end of the first inductor is connected to the positive electrode of the fifth diode and the first end of the first transistor, and the second end of the second transistor is grounded; the input end of the first gate driver is connected to the first PWM signal output end of the controller (18), the output end of the first gate driver is connected to the control of the first transistor, the cathode of the fifth diode is connected to the first end of the third capacitor, and the second end of the third capacitor is grounded.

4. The electrical stimulation circuit according to claim 3, characterized in that: The forward feedback control circuit (14) comprises: a first operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a fourth capacitor, a sixth diode, and a seventh diode; The first end of the third capacitor is connected to the first end of the first resistor, the second end of the first resistor is connected to the first end of the second resistor, the first end of the fourth capacitor, and the negative input end of the first operational amplifier, and the second end of the second resistor and the second end of the fourth capacitor are grounded; the second PWM signal output end of the controller (18) is connected to the first end of the fourth resistor, the second end of the fourth resistor is connected to the first end of the fifth resistor and the positive input end of the first operational amplifier, the second end of the fifth resistor is grounded, the output end of the first operational amplifier is connected to the first end of the third resistor, the second end of the third resistor is connected to the positive electrode of the sixth diode, the negative electrode of the seventh diode, and the positive feedback receiving end of the controller (18), the negative electrode of the sixth diode is connected to the power supply, and the positive electrode of the seventh diode is grounded.

5. The electrical stimulation circuit according to claim 4, characterized in that: Also includes: Isolate the power circuit; The isolated power supply circuit includes: a second transformer, a third transformer, a second rectifier bridge, a third rectifier bridge, a fourth rectifier bridge, a fifth capacitor, a sixth capacitor, and a seventh capacitor; The second end of the first secondary coil of the first transformer is connected to the first end of the primary coil of the second transformer and the first end of the primary coil of the third transformer, and the second end of the second secondary coil of the first transformer is connected to the second end of the primary coil of the second transformer and the second end of the primary coil of the third transformer; The first end of the first secondary coil of the second transformer and the first end of the second secondary coil are connected to the first input end of the second rectifier bridge, the second end of the first secondary coil of the second transformer and the second end of the second secondary coil are connected to the second input end of the second rectifier bridge, and the fifth capacitor is connected in parallel across the output end of the second rectifier bridge; the first end of the first secondary coil of the third transformer is connected to the first input end of the third rectifier bridge, the second end of the first secondary coil of the third transformer is connected to the second input end of the third rectifier bridge, and the sixth capacitor is connected in parallel across the output end of the third rectifier bridge; the first end of the second secondary coil of the third transformer is connected to the first input end of the fourth rectifier bridge, the second end of the second secondary coil of the third transformer is connected to the second input end of the fourth rectifier bridge, and the seventh capacitor is connected in parallel across the output end of the fourth rectifier bridge; The two output ends of the second rectifier bridge serve as the first voltage output ends, the two output ends of the third rectifier bridge serve as the second voltage output ends, and the two output ends of the fourth rectifier bridge serve as the third voltage output ends.

6. The electrical stimulation circuit according to claim 5, characterized in that: The forward control discharge circuit (16) comprises: a second transistor, a sixth resistor, a seventh resistor, a first isolation gate driver, and a first triode; The forward switch control end of the controller (18) is connected to the control end of the first transistor, the emitter of the first transistor is grounded, the collector of the first transistor is connected to the input end of the first isolation gate driver, the output end of the first isolation gate driver is connected to the first end of the sixth resistor, the second end of the sixth resistor is connected to the control end of the second transistor and the first end of the seventh resistor, the first end of the second transistor is connected to the first end of the third capacitor, the second end of the second transistor is connected to the second end of the seventh resistor and the second power supply end of the first isolation gate driver; the second end of the second transistor is connected to the electrode sheet (19), the first power supply end of the first isolation gate driver is connected to the first end of the first voltage output end, and the second power supply end of the first isolation gate driver is connected to the second end of the first voltage output end.

7. The electrical stimulation circuit according to claim 6, characterized in that: The negative boost circuit (13) comprises: a second inductor, an eighth diode, a third transistor, an eighth resistor, a ninth resistor, an eighth capacitor, a ninth capacitor, and a second isolation gate driver; The first end of the second capacitor is connected to the first end of the second inductor; the third PWM signal output end of the controller (18) is connected to the input end of the second isolation gate driver; the first power supply end of the second isolation gate driver is connected to the first end of the second voltage output end and the first end of the eighth capacitor; the second power supply end of the second isolation gate driver is connected to the second end of the second voltage output end, the second end of the eighth capacitor, the first end of the ninth resistor, the second end of the second inductor, the first end of the third transistor, and the negative electrode of the eighth diode; the output end of the second isolation gate driver is connected to the second end of the ninth resistor and the control end of the third transistor through the eighth resistor; the second end of the third transistor is grounded; the positive electrode of the eighth diode is connected to the first end of the ninth capacitor, and the second end of the ninth capacitor is grounded.

8. The electrical stimulation circuit according to claim 7, characterized in that: The negative feedback control circuit (15) comprises: a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a ninth diode, a tenth diode, a second operational amplifier, and a third operational amplifier; The second end of the ninth capacitor is connected to the negative input end of the third operational amplifier and the output end of the second operational amplifier through the tenth resistor; the fourth PWM signal output end of the controller (18) is connected to the first end of the eleventh resistor, the second end of the eleventh resistor is connected to the first end of the twelfth resistor and the positive input end of the second operational amplifier, the second end of the twelfth resistor is grounded, the negative input end of the second operational amplifier is connected to the output end, the positive input end of the third operational amplifier is grounded, the output end of the third operational amplifier is connected to the positive electrode of the ninth diode, the negative electrode of the tenth diode, and the negative feedback receiving end of the controller (18) through the thirteenth resistor, the negative electrode of the ninth diode is connected to the power supply, and the positive electrode of the tenth diode is grounded.

9. The electrical stimulation circuit according to claim 8, characterized in that: The negative control discharge circuit (17) comprises: a second triode, a third isolation gate driver, a fourth transistor, a fourteenth resistor, a fifteenth resistor, and a tenth capacitor; The negative switch control terminal of the controller (18) is connected to the control terminal of the second transistor, the emitter of the second transistor is grounded, the collector of the second transistor is connected to the input terminal of the third isolation gate driver, the output terminal of the third isolation gate driver is connected to the first terminal of the fifteenth resistor, the second terminal of the fifteenth resistor is connected to the first terminal of the fourteenth resistor and the control terminal of the fourth transistor, the first terminal of the fourth transistor is connected to the second terminal of the third voltage output terminal, the second terminal of the fourteenth resistor, the second power supply terminal of the third isolation gate driver, and the first terminal of the tenth capacitor, and the second terminal of the tenth capacitor is connected to the first power supply terminal of the third isolation gate driver and the first terminal of the third voltage output terminal.

10. The electrical stimulation circuit according to claim 4, characterized in that: Also includes a first low-pass filter circuit; The positive input terminal of the first operational amplifier is connected to the fourth resistor through the first low-pass filter circuit.

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