A neuromuscular electrical stimulation control circuit and control method based on bio-signal feedback

Abstract

The application discloses a neuromuscular electrical stimulation control circuit and control method based on biological signal feedback, which comprises a control replication circuit and a signal generation circuit, the signal generation circuit and the control replication circuit are connected and provide the frequency voltage currently used, and different waveforms of corresponding frequencies are generated according to the V1 signal feedback of the control replication circuit, the control replication circuit comprises a plurality of replication units, the replication units are consistent with the number of frequency points required to be intercepted, and the replication unit comprises an operational amplifier, a flip-flop, a digital potentiometer, a switch, and a resistor; one end of the switch S1, the H pin, the W pin, the VDD pin of the digital potentiometer U2, the CLR pin and the PRE pin of the flip-flop U4, and the power supply are connected, and the other end of the switch S1 and the 1CLK pin of the flip-flop U4 are connected; the U / D anti-pin of the digital potentiometer U2 and the output end of the operational amplifier U3 are connected, and the L pin of the digital potentiometer U2, one end of the resistor R8, the non-inverting terminal of the operational amplifier U3 and the V1 end are connected.

Description

Technical Field

[0001] The present invention relates to the field of electrical stimulation technology, and in particular to a neuromuscular electrical stimulation control circuit and control method based on biological signal feedback. Background Art

[0002] Publication No. CN118543029A discloses a neuromuscular electrical stimulation device based on an AN pseudo-random signal, which can achieve multi-frequency synchronous stimulation of multiple parts of the nerves and muscles. However, in actual applications, since the electrodes are reused, the reuse area may change or the order of electrode distribution may change. Although the waveform and frequency of the electrode can be secondary controlled, they still need to be adjusted each time they are used. Therefore, a neuromuscular electrical stimulation control circuit and control method based on biological signal feedback are proposed, which can intercept any desired frequency point on the basis of control and quickly switch when used. Summary of the Invention

[0003] In response to the above technical problems, the present invention aims to provide a neuromuscular electrical stimulation control circuit based on biosignal feedback, comprising a centralized control replication circuit and a signal generation circuit. The signal generation circuit is connected to the centralized control replication circuit and provides the currently used frequency voltage, and generates different waveforms of corresponding frequencies based on the V1 signal fed back by the centralized control replication circuit. The centralized control replication circuit includes multiple replication units, the number of which is consistent with the number of frequency points to be intercepted, and the replication units include an operational amplifier, a trigger, a digital potentiometer, a switch, and a resistor.

[0004] One end of the switch S1, the H pin, W pin, VDD pin of the digital potentiometer U2, the CLR pin, PRE pin of the trigger U4 and the power supply are connected; the other end of the switch S1 is connected to the 1CLK pin of the trigger U4; the U / D inverting pin of the digital potentiometer U2 is connected to the output end of the op amp U3, the L pin of the digital potentiometer U2, one end of the resistor R8, the in-phase end of the op amp U3 and the V1 end are connected, the CS inverting pin of the digital potentiometer U2 is connected to the 1D pin and 1Q inverting pin of the trigger U4; the inverting end of the op amp U3 is connected to the Port end; the GND pin of the digital potentiometer U2, the other end of the resistor R8 and the ground end are connected.

[0005] Furthermore, the replication unit further includes a plurality of triodes, a plurality of thyristors, a plurality of diodes, a plurality of resistors, a field effect transistor, and an AND gate;

[0006] The base of the transistor Q1 in the plurality of transistors is connected to the cathode of the diode D3 and one end of the resistor R4, the emitter is connected to one end of the resistor R2 and one end of the resistor R3, the collector is connected to the control electrode of the thyristor D1 and one end of the resistor R5; the gate of the field effect transistor Q2 is connected to the output end of the operational amplifier U3, the source is connected to the anode of the diode D3, the anode of the diode D4, one end of the resistor R9, the drain, the collector of the transistor Q3, the other end of the resistor R3 and the power supply; the emitter of the transistor Q3 is connected to the control electrode of the thyristor D2 and the resistor R12 One end is connected; the anode of thyristor D1, the anode of thyristor D2 are connected to the 1Q pin of trigger U4, and the cathode is connected to the first input terminal of AND gate U1 and one end of resistor R6; the cathode of thyristor D2 is connected to the second input terminal of AND gate U1 and one end of resistor R10; the output terminal of AND gate U1 is connected to the 1CLK pin of trigger U4; the other end of resistor R2, the other end of resistor R4, the other end of resistor R5, the other end of resistor R6, the other end of resistor R9, the other end of resistor R10, the other end of resistor R12 and the ground terminal are connected.

[0007] Furthermore, the common waveform generating pre-unit includes a plurality of operational amplifiers, a plurality of resistors, a plurality of diodes, a trigger, and a code selection switch;

[0008] The signal generating circuit includes a plurality of common waveform generating pre-units and a plurality of waveform converters, wherein the op amp U5 in-phase terminal is connected to the op amp U6 inverting terminal, one end of the capacitor C1, one end of the resistor R14, and one end of the resistor R20, the inverting terminal is connected to one end of the resistor R15 and one end of the resistor R17, and the output terminal is connected to the anode of the diode D5; the op amp U6 in-phase terminal is connected to the other end of the resistor R17 and one end of the resistor R18, and the output terminal is connected to the anode of the diode D6; the CLR pin, PRE pin, and collector of the transistor Q4 of the trigger U7 are connected to the power supply, and the 1D pin, the 1Q inverting pin, the base of the transistor Q5 and the Ou The 1CLK pin is connected to the cathode of diode D5, the cathode of diode D6, and one end of resistor R19, the 1Q pin is connected to the base of transistor Q4; the emitter of transistor Q4 is connected to the other end of resistor R14; the collector of transistor Q5 is connected to the other end of resistor R20; one end of resistor R13, the other end of resistor R15, and one end of resistor R16 are connected to the Port terminal, and the other end is connected to the code selection switch S2; the Out terminal is connected to multiple waveform converters; the emitter of transistor Q5, the other end of capacitor C1, the other end of resistor R16, the other end of resistor R18, the other end of resistor R19 and ground are connected.

[0009] Furthermore, the signal generating circuit includes a voltage-controlled oscillator and a waveform converter. The input end of the voltage-controlled oscillator is connected to V1 in the replication unit for converting the V1 voltage into a waveform signal. The output end of the voltage-controlled oscillator is connected to the waveform converter for converting into a different waveform signal.

[0010] Furthermore, the replication unit further includes a plurality of resistors;

[0011] One end of the resistor R1 among the multiple resistors is connected to the 1Q pin of the trigger U4; one end of the resistor R7 is connected to the 1CLK pin of the trigger U4; one end of the resistor R11 is connected to the U / D inverting pin of the digital potentiometer U2; the other end of the resistor R1, the other end of the resistor R7, and the other end of the resistor R11 are connected to the ground end.

[0012] Furthermore, the resistor R13 is an adjustable resistor.

[0013] Furthermore, a neuromuscular electrical stimulation control method based on biological signal feedback includes the following steps:

[0014] S1. Sample the frequency and waveform signal used by the current electrode;

[0015] S2. Convert the current frequency signal into a corresponding voltage signal and then intercept it;

[0016] S3 intercepts the progress of the test, after the test is completed, the circuit is initialized;

[0017] S4. Connect the position of the code selection switch to the intercepted signal and convert the intercepted signal into a frequency signal adjusted in advance;

[0018] S5. Convert the previously adjusted frequency signal into the desired waveform through a waveform converter.

[0019] The beneficial effects of the present invention compared with the prior art are:

[0020] The present invention can achieve flexible interception of the current electrode usage frequency, avoid repeated adjustments when the electrode is reused in different areas, and can also monitor the interception progress in real time without standby or fault interruption. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, a brief introduction is given below to the prior art and the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 This is a circuit structure diagram of the replication unit provided by the present invention.

[0023] Figure 2 This is a circuit structure diagram of the common waveform generation preamplifier unit provided by the present invention. DETAILED DESCRIPTION

[0024] In order to make the objects and advantages of the present invention more clearly understood, the present invention is described in detail below with reference to the embodiments. It should be understood that the following text is only used to describe one or several specific implementation methods of the present invention and does not strictly limit the scope of protection specifically requested by the present invention.

[0025] The present invention discloses a neuromuscular electrical stimulation control circuit based on biosignal feedback, comprising a centralized control replication circuit and a signal generation circuit. The signal generation circuit is connected to the centralized control replication circuit and provides a currently used frequency voltage, and generates different waveforms of corresponding frequencies based on the V1 signal fed back by the centralized control replication circuit. The centralized control replication circuit includes multiple replication units, each of which has the same number of frequency points as the required interception frequency points. The replication units include an operational amplifier, a trigger, a digital potentiometer, a switch, and a resistor.

[0026] One end of the switch S1, the H pin, W pin, VDD pin of the digital potentiometer U2, the CLR pin, PRE pin of the trigger U4 and the power supply are connected; the other end of the switch S1 is connected to the 1CLK pin of the trigger U4; the U / D inverting pin of the digital potentiometer U2 is connected to the output end of the op amp U3, the L pin of the digital potentiometer U2, one end of the resistor R8, the in-phase end of the op amp U3 and the V1 end are connected, the CS inverting pin of the digital potentiometer U2 is connected to the 1D pin and 1Q inverting pin of the trigger U4; the inverting end of the op amp U3 is connected to the Port end; the GND pin of the digital potentiometer U2, the other end of the resistor R8 and the ground end are connected.

[0027] As attached Figure 1 As shown, specifically, the replication unit further includes a plurality of triodes, a plurality of thyristors, a plurality of diodes, a plurality of resistors, a field effect transistor, and an AND gate;

[0028] The base of the transistor Q1 in the plurality of transistors is connected to the cathode of the diode D3 and one end of the resistor R4, the emitter is connected to one end of the resistor R2 and one end of the resistor R3, the collector is connected to the control electrode of the thyristor D1 and one end of the resistor R5; the gate of the field effect transistor Q2 is connected to the output end of the operational amplifier U3, the source is connected to the anode of the diode D3, the anode of the diode D4, one end of the resistor R9, the drain, the collector of the transistor Q3, the other end of the resistor R3 and the power supply; the emitter of the transistor Q3 is connected to the control electrode of the thyristor D2 and the resistor R12 One end is connected; the anode of thyristor D1, the anode of thyristor D2 are connected to the 1Q pin of trigger U4, and the cathode is connected to the first input terminal of AND gate U1 and one end of resistor R6; the cathode of thyristor D2 is connected to the second input terminal of AND gate U1 and one end of resistor R10; the output terminal of AND gate U1 is connected to the 1CLK pin of trigger U4; the other end of resistor R2, the other end of resistor R4, the other end of resistor R5, the other end of resistor R6, the other end of resistor R9, the other end of resistor R10, the other end of resistor R12 and the ground terminal are connected.

[0029] As attached Figure 2 As shown, specifically, the signal generating circuit includes a plurality of common waveform generating pre-units and a plurality of waveform converters, and the common waveform generating pre-units include a plurality of operational amplifiers, a plurality of resistors, a plurality of diodes, a trigger, and a code selection switch;

[0030] The op amp U5 non-inverting terminal is connected to the op amp U6 inverting terminal, one end of the capacitor C1, one end of the resistor R14, and one end of the resistor R20, the inverting terminal is connected to one end of the resistor R15 and one end of the resistor R17, and the output terminal is connected to the anode of the diode D5; the op amp U6 non-inverting terminal is connected to the other end of the resistor R17 and one end of the resistor R18, and the output terminal is connected to the anode of the diode D6; the CLR pin, PRE pin, collector of the transistor Q4 and the power supply of the trigger U7 are connected, the 1D pin, the 1Q inverting pin, the base of the transistor Q5 and the Out terminal are connected, and the 1CLK pin is connected to the diode D 5 cathode, the cathode of diode D6, and one end of resistor R19 are connected, and the 1Q pin is connected to the base of transistor Q4; the emitter of transistor Q4 is connected to the other end of resistor R14; the collector of transistor Q5 is connected to the other end of resistor R20; one end of resistor R13, the other end of resistor R15, and one end of resistor R16 are connected to the Port end, and the other end is connected to the code selection switch S2; the Out end is connected to multiple waveform converters; the emitter of transistor Q5, the other end of capacitor C1, the other end of resistor R16, the other end of resistor R18, the other end of resistor R19 and the ground end are connected.

[0031] As attached Figure 1 As shown, specifically, the signal generating circuit includes a voltage-controlled oscillator and a waveform converter. The input end of the voltage-controlled oscillator is connected to V1 in the replication unit for converting the V1 voltage into a waveform signal. The output end of the voltage-controlled oscillator is connected to the waveform converter for converting into a different waveform signal.

[0032] As attached Figure 1 As shown, specifically, the replication unit further includes a plurality of resistors;

[0033] One end of the resistor R1 among the multiple resistors is connected to the 1Q pin of the trigger U4; one end of the resistor R7 is connected to the 1CLK pin of the trigger U4; one end of the resistor R11 is connected to the U / D inverting pin of the digital potentiometer U2; the other end of the resistor R1, the other end of the resistor R7, and the other end of the resistor R11 are connected to the ground end.

[0034] As attached Figure 2 As shown, specifically, the resistor R13 is an adjustable resistor.

[0035] Specifically, a neuromuscular electrical stimulation control method based on biosignal feedback includes the following steps:

[0036] S1. Sample the frequency and waveform signal used by the current electrode;

[0037] S2. Convert the current frequency signal into a corresponding voltage signal and then intercept it;

[0038] S3 intercepts the progress of the test, after the test is completed, the circuit is initialized;

[0039] S4. Connect the position of the code selection switch to the intercepted signal and convert the intercepted signal into a frequency signal adjusted in advance;

[0040] S5. Convert the previously adjusted frequency signal into the desired waveform through a waveform converter.

[0041] See attached Figure 1 , Attachment Figure 2 The number of replication units in the centralized control replication circuit corresponds to the number of frequencies to be intercepted. The ports of each replication unit are connected in parallel to obtain the currently adjusted frequency voltage. After interception, it is input to the signal generation circuit through the V series connection terminal. The signal generation circuit includes multiple common waveform generation pre-units or multiple voltage-controlled oscillators and waveform converters. The frequency voltage input by the port is the input voltage of the voltage-controlled oscillator. The voltage-controlled oscillator is used to convert the V1 signal into a pre-adjusted frequency signal, which is then input to the waveform converter to complete the waveform output required by the electrode (the voltage-controlled oscillator and waveform converter are not shown in the attached figure). The control method is to turn the code selection switch S2 to the VDD position when intercepting the frequency. The range is low frequency 0-1000HZ. Then press switch S1 to automatically intercept. When in use, just toggle the code selection switch S2. The switch S1 in the copy unit is the copy start switch. The inverting end of the op amp U3 is connected to the Port to receive the frequency voltage. The non-inverting end of the op amp U3 samples the voltage at the connection end of the L pin of the digital potentiometer U2 and the resistor R8. The H and W pins of the digital potentiometer U2 are connected to the power supply. Assuming that the digital potentiometer U2 uses the model MAX5160, the resistance of this chip is 10K, then the resistance value of resistor R8 is consistent. The resistance value of resistor R13 of the multi-waveform preamplifier circuit corresponds to the resistance value of the digital potentiometer U2, and the resistance R16 corresponds to the resistance value of resistor R8. The signal at the output end of the op amp U3 is fed back to the 1CLK pin of the trigger U4. The purpose is to copy the corresponding adjusted resistance and voltage to the digital potentiometer U2 after the Port input, and then input the voltage at the connection end of the L pin of the digital potentiometer U2 and the resistor R8 to other common waveform generation preamplifier units to complete the interception of the frequency point.

[0042] See attached Figure 1In another embodiment, based on the above solution, detection of the interception progress and automatic initialization are added. Compared with the above solution, this can avoid the long standby time caused by manual initialization or the fault interruption caused by manual stop control when the copying progress is not completed. Since the operational amplifier U3 will have two output states during the resistance copying process, namely, two output results from 1 to 0 or 0 to 1, the initialization cannot use a single high or low level to correspond to the reset. Therefore, the problem to be solved is that no matter what the comparison result between the currently copied resistance value and the voltage at the connection end of the resistor R13 after the resistance value adjustment and the resistor R16 in the common waveform generation pre-unit is (which is also the input voltage of the voltage-controlled oscillator), the two output results need to be forced to change from 1 to 0 or 0 to 1, and then the change process is used as the data. The digital potentiometer U2 resistance value is copied and the stop signal is output by the AND gate U1. Therefore, the output result from 0 to 1 is used. The specific signal change is that the signal at the output end of the operational amplifier U3 is input to the U / D pin of the digital potentiometer U2 and is also input to the gate of the field effect transistor Q2. The drain of the field effect transistor Q2 is connected to the power supply. Assuming that the output of the operational amplifier U3 is 1 first and then 0, when the operational amplifier U3 outputs, the signal is pulled up by the source of the field effect transistor Q2 and the resistor R9 and then input to the diode D3 and the diode D4 respectively. The signal of the diode D4 will be fed back to the base of the transistor Q3 to turn on the transistor Q3. The collector power supply of the transistor Q3 is pulled up by the resistor R12 to the ground circuit and then fed back to the control electrode of the thyristor D2. The thyristor D2 is turned on and the trigger U4 is turned on. The 1Q pin is connected to the ground circuit through the anode of the thyristor D2, the resistor R10, and the 5th pin of the trigger U4 is the 1Q pin, and the 6th pin is the 1Q inverse pin and is connected to 1D, so that the 1Q pin has no output when the switch S1 is in the attached state, and the 1Q inverse pin outputs. When the switch S1 is activated, the 1Q pin outputs, and the 1Q inverse pin does not output. Then the resistor R10 and the thyristor D2 cathode connection end signal are input to one end of the AND gate U1. At the same time, after the diode D3 is turned on, the source signal of the field effect tube Q2 will also be fed back to the base of the transistor Q1. The emitter of the transistor Q1 is powered by the resistor R3 and the resistor R2, so that the voltage input to the diode D3 when the field effect tube Q2 is turned on is higher than the base of the transistor Q1. The transistor Q1 is biased and cut off, and the thyristor D1 has no output. With the op amp U 3 The output end is fed back to the U / D pin signal of the digital potentiometer U2 and the INC inverse pin input of the digital potentiometer U2. After the digital potentiometer U2 adjusts its resistance value and gradually approaches and is consistent with the resistor R13, the output of the op amp U3 is 0. At this time, the field effect transistor Q2 is cut off, and the power supply signal at the connection end of the resistor R3 and the resistor R2 will pass through the emitter of the transistor Q1 and the resistor R4 loop. The transistor Q1 is turned on and input to the control electrode of the thyristor D1 after passing through the resistor R5 loop. The 1Q pin signal of the trigger U4 is then looped through the thyristor D1 and the ground end of the resistor R6. The signal at the connection end of the cathode of the thyristor D1 and the resistor R6 is input to another input pin of the AND gate U1. The AND gate U1 outputs a signal to the 1CLK pin of the trigger U4. The 1Q pin of the trigger U4 has no output.The 1Q inverse pin is output again, completing the forced change of the first result; if the output process of the operational amplifier U3 is 0 first and then 1, the transistor Q1 is initially in the cut-off state. At this time, after the switch S1 is closed, the 1Q pin of the trigger U4 is input to the anode of the thyristor D1 and the thyristor D2. Because there is no signal input to the diode D3 and the diode D4, the voltage at the connection end of the resistor R3 and the resistor R2 is turned on after passing through the transistor Q1 emitter, base, and resistor R4 loop. The collector voltage is input to the thyristor D1 control electrode, and the thyristor D1 is turned on. As the digital potentiometer U2 adjusts the resistance value and gradually approaches and is consistent with the resistor R13, the output of the operational amplifier U3 is 1, the field effect transistor Q2 is turned on, and the signal is fed back to the base of the transistor Q1 through the diode D3. The transistor Q1 is cut off, and there is a forward current from the anode to the cathode of the thyristor D1. And there is a positive voltage on the anode. The voltage signal at the connection end of the thyristor D1 cathode and resistor R6 will be fed back to one input end of the AND gate U1. When the field effect tube Q2 is turned on, the transistor Q3 will also be turned on. Its collector power supply is fed back to the thyristor D2 after passing through the transistor Q3 and resistor R12 loop, so that the thyristor D2 also has a forward current. The signal at the connection end of the thyristor D2 cathode and resistor R10 is fed back to the other input end of the AND gate U1. The AND gate U1 outputs a signal to the 1CLK pin of the trigger U4. The 1Q pin of the trigger U4 has no output, and the 1Q inverse pin outputs again, completing the forced change of the second result. The two results are forced to become 0 first and then 1. Assuming that the trigger U4 uses a low-level set type, the result is forced to become 1 first and then 0. Replace the AND gate U1 with a NAND gate.

[0043] See attached Figure 2In one embodiment, the input of the port frequency voltage adopts a common waveform generation preamplifier unit instead of a voltage-controlled oscillator. When connecting, one of them can be connected to the copy unit to complete the frequency interception of all copy units. Out can output a square wave signal by default, reducing the number of settings of a waveform converter. The adjusting resistor R13 in the circuit can adjust the output frequency of Out, wherein the resistor R13 and the resistor R16 are used to provide the frequency voltage for the Port, and then the resistor R15, the resistor R17, and the resistor R18 provide the corresponding frequency voltage divided signal to the inverting terminal of the operational amplifier U5 and the non-inverting terminal of the operational amplifier U6. The non-inverting terminal of the operational amplifier U5 and the inverting terminal of the operational amplifier U6 are connected in parallel. The resistor R14 is used for current limiting, and the capacitor C1 is used for filtering and integrating and feeding back to the operational amplifier U5 and the operational amplifier U6. When the circuit is powered on, the inverting terminal of the operational amplifier U5 samples the voltage of the capacitor C1 terminal, and its output terminal outputs the signal through the diode D6 is fed back to the 1CLK pin of the trigger U7, and the 1Q pin of the trigger U7 outputs a signal to the base of the transistor Q4. The transistor Q4 is turned on, and the power supply is fed back to the capacitor C1 through the collector, emitter and resistor R14 of the transistor Q4. At the same time, the 1Q inverse pin of the trigger U7 has no output, and the transistor Q5 is cut off. When the voltage at the capacitor C1 end rises to the divided voltage of the inverting terminal of the operational amplifier U5, the output signal of the operational amplifier U5 is fed back to the 1CLK pin of the trigger U7 through the diode D5. The 1Q inverse pin of the trigger U7 outputs a signal to the base of the transistor Q5, and the transistor Q5 is turned on. The voltage at the capacitor C1 end is pulled down to the initial power-on state again through the resistor R20, the collector and emitter of the transistor Q5, and the ground terminal loop. The voltage at the capacitor C1 end is then pulled down to the initial power-on state. Then the operational amplifier U6 outputs again. The diodes D5 and D6 are used to de-invert the signals to avoid mutual ground loops through the output terminal.

[0044] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed therein. Any reference in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A neuromuscular electrical stimulation control circuit based on biological signal feedback, characterized in that: It includes a centralized control replication circuit and a signal generation circuit. The signal generation circuit is connected to the centralized control replication circuit and provides the currently used frequency voltage, and generates different waveforms of corresponding frequencies according to the V1 signal fed back by the centralized control replication circuit. The centralized control replication circuit includes multiple replication units. The number of replication units is consistent with the number of frequency points to be intercepted. The replication units include operational amplifiers, triggers, digital potentiometers, switches, multiple triodes, multiple thyristors, multiple diodes, multiple resistors, field effect transistors, and AND gates. One end of the switch S1, the H pin, W pin, VDD pin of the digital potentiometer U2, the CLR pin, and PRE pin of the trigger U4 are connected to the power supply; the other end of the switch S1 is connected to the 1CLK pin of the trigger U4; the U / D inverting pin of the digital potentiometer U2 is connected to the output end of the operational amplifier U3, the L pin of the digital potentiometer U2, one end of the resistor R8, the in-phase end of the operational amplifier U3 and the V1 end are connected, the CS inverting pin of the digital potentiometer U2 is connected to the 1D pin and 1Q inverting pin of the trigger U4 The pin is connected; the inverting end of the operational amplifier U3 is connected to the Port end; the GND pin of the digital potentiometer U2, the other end of the resistor R8 and the ground end are connected; the base of the transistor Q1 in the plurality of transistors is connected to the cathode of the diode D3 and one end of the resistor R4, the emitter is connected to one end of the resistor R2 and one end of the resistor R3, the collector is connected to the control electrode of the thyristor D1 and one end of the resistor R5; the gate of the field effect transistor Q2 is connected to the output end of the operational amplifier U3, the source is connected to the anode of the diode D3, the anode of the diode D4, and the resistor R 9, the drain, the collector of transistor Q3, the other end of resistor R3 and the power supply are connected; the emitter of transistor Q3 and the control electrode of thyristor D2 and one end of resistor R12 are connected; the anode of thyristor D1 and thyristor D2 are connected to the 1Q pin of trigger U4, and the cathode is connected to the first input terminal of AND gate U1 and one end of resistor R6; the cathode of thyristor D2 is connected to the second input terminal of AND gate U1 and one end of resistor R10; the output terminal of AND gate U1 is connected to the 1CLK pin of trigger U4; resistor R2 The other end of the resistor R1, the other end of the resistor R4, the other end of the resistor R5, the other end of the resistor R6, the other end of the resistor R9, the other end of the resistor R10, and the other end of the resistor R12 are connected to the ground end, one end of the resistor R1 among the resistors is connected to the 1Q pin of the trigger U4; one end of the resistor R7 is connected to the 1CLK pin of the trigger U4; one end of the resistor R11 is connected to the U / D inverse pin of the digital potentiometer U2; the other end of the resistor R1, the other end of the resistor R7, and the other end of the resistor R11 are connected to the ground end.

2. The neuromuscular electrical stimulation control circuit based on biological signal feedback according to claim 1, characterized in that: The signal generating circuit includes a plurality of common waveform generating pre-units and a plurality of waveform converters, wherein the common waveform generating pre-units include a plurality of operational amplifiers, a plurality of resistors, a plurality of diodes, a trigger, and a code selection switch; The operational amplifier U5 in the plurality of operational amplifiers is connected to the inverting terminal of the operational amplifier U6, one end of the capacitor C1, one end of the resistor R14, and one end of the resistor R20, the inverting terminal is connected to one end of the resistor R15 and one end of the resistor R17, and the output terminal is connected to the anode of the diode D5; the inverting terminal of the operational amplifier U6 is connected to the other end of the resistor R17 and one end of the resistor R18, and the output terminal is connected to the anode of the diode D6; the CLR pin, PRE pin, collector of the transistor Q4 and the power supply are connected, the 1D pin, the inverting pin of the 1Q, the base of the transistor Q5 and the Out terminal are connected, and the 1CLK pin is connected to the diode D6. The cathode of transistor D5, the cathode of diode D6, and one end of resistor R19 are connected, and the 1Q pin is connected to the base of transistor Q4; the emitter of transistor Q4 is connected to the other end of resistor R14; the collector of transistor Q5 is connected to the other end of resistor R20; one end of resistor R13, the other end of resistor R15, and one end of resistor R16 are connected to the Port end, and the other end is connected to the code selection switch S2; the Out end is connected to multiple waveform converters; the emitter of transistor Q5, the other end of capacitor C1, the other end of resistor R16, the other end of resistor R18, the other end of resistor R19 and the ground end are connected.

3. The neuromuscular electrical stimulation control circuit based on biological signal feedback according to claim 1, characterized in that: The signal generating circuit includes a voltage-controlled oscillator and a waveform converter. The input end of the voltage-controlled oscillator is connected to V1 in the replica unit for converting the V1 voltage into a waveform signal. The output end of the voltage-controlled oscillator is connected to the waveform converter for converting into a different waveform signal.

4. The neuromuscular electrical stimulation control circuit based on biological signal feedback according to claim 2, characterized in that: The resistor R13 is an adjustable resistor.

5. A neuromuscular electrical stimulation control method based on biosignal feedback, using the neuromuscular electrical stimulation control circuit based on biosignal feedback according to any one of claims 1 to 4, characterized in that: The steps include: S1. Sample the frequency and waveform signal used by the current electrode; S2. Convert the current frequency signal into a corresponding voltage signal and then intercept it; S3 intercepts the progress of the test, after the test is completed, the circuit is initialized; S4. Connect the position of the code selection switch to the intercepted signal and convert the intercepted signal into a frequency signal adjusted in advance; S5. Convert the previously adjusted frequency signal into the desired waveform through a waveform converter.

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