Neuromuscular electrical stimulation control circuit and control method based on biological signal feedback

Abstract

The invention discloses a neuromuscular electrical stimulation control circuit and control method based on biological signal feedback, and the circuit comprises a centralized control copy circuit and a signal generation circuit which are connected with each other and provide a currently used frequency voltage. Different waveforms of corresponding frequencies are generated according to V1 signals fed back by the centralized control copy circuit, the centralized control copy circuit comprises a plurality of copy units, the number of the copy units is consistent with that of frequency points needing to be intercepted, and each copy unit comprises an operational amplifier, a trigger, a digital potentiometer, a switch and a resistor; one end of the switch S1, an H pin, a W pin and a VDD pin of the digital potentiometer U2, and a CLR pin and a PRE pin of the trigger U4 are connected with a power supply, and the other end of the switch S1 is connected with a 1CLK pin of the trigger U4; the U / D reverse pin of the digital potentiometer U2 is connected with 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 of the operational amplifier U3 are connected.

Description

Technical Field

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

[0002] A neuromuscular electrical stimulation device based on an AN pseudo-random signal disclosed in the publication number CN118543029A can achieve multi-frequency synchronous stimulation of multiple parts of the neuromuscular. However, in practical applications, since the electrodes adopt a multiplexing method, the multiplexing area may change or the electrode distribution order may be altered. Although the waveform and frequency of the electrodes can be adjusted secondly, adjustment is still required each time it is used. Therefore, a neuromuscular electrical stimulation control circuit and control method based on biological signal feedback are proposed, which can intercept any required frequency point on the basis of regulation and quickly switch during use. Summary of the Invention

[0003] Aiming at the above technical problems, the object of the present invention is to provide a neuromuscular electrical stimulation control circuit based on biological signal feedback, including 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 frequency voltage currently in use, and generates different waveforms corresponding to the frequency according to the V1 signal fed back by the centralized control replication circuit. The centralized control replication circuit includes a plurality of replication units, and the number of replication units is the same as the number of frequency points to be intercepted. The replication unit includes an operational amplifier, a trigger, a digital potentiometer, a switch, and a resistor. 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 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 reverse 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 non-inverting input end of the operational amplifier U3 and the V1 end are connected; the CS reverse pin of the digital potentiometer U2 is connected to the 1D pin and 1Q reverse pin of the trigger U4; the inverting input 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 are connected to the ground terminal.

[0004] Further, the replication unit further includes several triodes, several thyristors, several diodes, several resistors, field effect transistors, and AND gates. The base of transistor Q1 among the several transistors is connected to the cathode of diode D3 and one end of resistor R4. The emitter is connected to one end of resistor R2 and one end of resistor R3. The collector is connected to the control electrode of thyristor D1 and one end of resistor R5. The gate of field-effect transistor Q2 is connected to the output terminal of operational amplifier U3. The source is connected to the anode of diode D3, the anode of diode D4, and one end of resistor R⑨. The drain, the collector of transistor Q3, the other end of resistor R3 are connected to the power supply. The emitter of transistor Q3 is connected to the control electrode of thyristor D2 and one end of resistor R12. The anode of thyristor D1, the anode of thyristor D2 are connected to the 1Q pin of flip-flop 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 flip-flop U4. The other ends of resistor R2, resistor R4, resistor R5, resistor R6, resistor R9, resistor R10, and resistor R12 are connected to the ground terminal.

[0005] Further, the common waveform generation pre-stage unit includes several operational amplifiers, several resistors, several diodes, flip-flops, and code selection switches; The signal generation circuit includes multiple common waveform generation pre-stage units and multiple waveform converters. The non-inverting input terminal of operational amplifier U5 is connected to the inverting input terminal of operational amplifier U6, one end of capacitor C1, one end of resistor R14, and one end of resistor R20. The inverting input terminal is connected to one end of resistor R15 and one end of resistor R17. The output terminal is connected to the anode of diode D5. The non-inverting input terminal of operational amplifier U6 is connected to the other end of resistor R17 and one end of resistor R18. The output terminal is connected to the anode of diode D6. The CLR pin, PRE pin, and the collector of transistor Q4 of flip-flop U7 are connected to the power supply. The 1D pin, the 1Q inverse pin, and the base of transistor Q5 are connected to the Out terminal. 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 ends are connected to the S2 terminal of the code selection switch. 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, and the other end of resistor R19 are connected to the ground terminal.

[0006] Further, the signal generation circuit includes a voltage-controlled oscillator and a waveform converter. The input terminal of the voltage-controlled oscillator is connected to V1 in the replication unit, which is used to convert the V1 voltage into a waveform signal. The output terminal of the voltage-controlled oscillator is connected to the waveform converter, which is used to convert it into different waveform signals.

[0007] Further, the replication unit also includes several resistors; One end of resistor R1 among the several resistors is connected to the 1Q pin of flip-flop U4; one end of resistor R7 is connected to the 1CLK pin of flip-flop U4; one end of resistor R11 is connected to the U / D reverse pin of digital potentiometer U2; the other ends of resistor R1, resistor R7, and resistor R11 are connected to the ground terminal.

[0008] Further, the resistor R13 is an adjustable resistor.

[0009] Further, a neuromuscular electrical stimulation control method based on biosignal feedback includes the following steps: S1. Sample the frequency and waveform signals used by the current electrode. S2. Convert the current frequency signal into a corresponding voltage signal and then intercept it. S3. Detect the interception progress, and initialize the circuit after the detection is completed. S4. Connect the gear position of the code selection switch to the intercepted signal, and convert the intercepted signal into a previously adjusted frequency signal. S5. Convert the previously adjusted frequency signal into the required waveform through a waveform converter.

[0010] The beneficial effects of the present invention compared with the prior art are as follows: The present invention can flexibly intercept the frequency used by the current electrode. When the electrode is reused in different areas, it can avoid repeated regulation, and can also monitor the interception progress in real time, without standby and fault interruption. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the prior art and the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0012] Figure 1 It is the circuit structure diagram of the replication unit provided by the present invention.

[0013] Figure 2 It is the circuit structure diagram of the common waveform generation pre-stage unit provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] In order to make the purpose and advantages of the present invention clearer, the following specifically describes the present invention in conjunction with the embodiments. It should be understood that the following text only describes one or several specific implementation manners of the present invention, and does not strictly limit the scope of protection specifically requested by the present invention.

[0015] The present invention discloses a neuromuscular electrical stimulation control circuit based on bio-signal feedback, which includes a centralized control and replication circuit and a signal generation circuit. The signal generation circuit is connected to the centralized control and replication circuit to provide the currently used frequency and voltage, and generate different waveforms with corresponding frequencies according to the V1 signal fed back by the centralized control and replication circuit. The centralized control and replication circuit includes a plurality of replication units, and the number of replication units is the same as the number of frequency points to be intercepted. Each replication unit includes an operational amplifier, a trigger, a digital potentiometer, a switch, and a resistor. 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 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 reverse 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 non-inverting input end of the operational amplifier U3 and the V1 end are connected; the CS reverse pin of the digital potentiometer U2 is connected to the 1D pin, 1Q reverse pin of the trigger U4; the inverting input 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 are connected to the ground terminal.

[0016] As shown in the attached Figure 1 Specifically, as shown in the figure, each replication unit further includes several triodes, several thyristors, several diodes, several resistors, a field effect transistor, and an AND gate. The base of the triode Q1 among the several triodes 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, and 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 one end of the resistor R9, and the drain, the collector of the triode Q3, and the other end of the resistor R3 are connected to the power supply; the emitter of the triode Q3 is connected to the control electrode of the thyristor D2 and one end of the resistor R12; the anode of the thyristor D1, the anode of the thyristor D2 are connected to the 1Q pin of the trigger U4, and the cathode is connected to the first input end of the AND gate U1 and one end of the resistor R6; the cathode of the thyristor D2 is connected to the second input end of the AND gate U1 and one end of the resistor R10; the output end of the AND gate U1 is connected to the 1CLK pin of the trigger U4; the other ends of the resistor R2, resistor R4, resistor R5, resistor R6, resistor R9, resistor R10, and resistor R12 are connected to the ground terminal.

[0017] As shown in the attached Figure 2 Specifically, as shown in the figure, the signal generation circuit includes a plurality of common waveform generation pre-stage units and a plurality of waveform converters. Each common waveform generation pre-stage unit includes several operational amplifiers, several resistors, several diodes, a trigger, and a code selection switch. The non-inverting input terminal of operational amplifier U5 is connected to the inverting input terminal of operational amplifier U6, one end of capacitor C1, one end of resistor R14, and one end of resistor R20. The inverting input terminal is connected to one end of resistor R15 and one end of resistor R17. The output terminal is connected to the anode of diode D5. The non-inverting input terminal of operational amplifier U6 is connected to the other end of resistor R17 and one end of resistor R18. The output terminal is connected to the anode of diode D6. The CLR pin, PRE pin, collector of triode Q4 of flip-flop U7 are connected to the power supply. The 1D pin, 1Q bar pin, base of triode Q5 are connected to the Out terminal. 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 triode Q4. The emitter of triode Q4 is connected to the other end of resistor R14. The collector of triode Q5 is connected to the other end of resistor R20. One end of resistor R13, the other end of resistor R15, one end of resistor R16 are connected to the Port terminal, and the other end is connected to the selection code switch S2 terminal. The Out terminal is connected to multiple waveform converters. The emitter of triode Q5, the other end of capacitor C1, the other end of resistor R16, the other end of resistor R18, and the other end of resistor R19 are connected to the ground terminal.

[0018] As shown in the attached Figure 1 figure, specifically, the signal generation circuit includes a voltage-controlled oscillator and a waveform converter. The input terminal of the voltage-controlled oscillator is connected to V1 in the replication unit, which is used to convert the V1 voltage into a waveform signal. The output terminal of the voltage-controlled oscillator is connected to the waveform converter, which is used to convert it into different waveform signals.

[0019] As shown in the attached Figure 1 figure, specifically, the replication unit further includes several resistors; One end of resistor R1 among the several resistors is connected to the 1Q pin of flip-flop U4; one end of resistor R7 is connected to the 1CLK pin of flip-flop U4; one end of resistor R11 is connected to the U / D bar pin of digital potentiometer U2; the other end of resistor R1, the other end of resistor R7, and the other end of resistor R11 are connected to the ground terminal.

[0020] As shown in the attached Figure 2 figure, specifically, resistor R13 is a variable resistor.

[0021] Specifically, a neuromuscular electrical stimulation control method based on bio-signal feedback includes the following steps: S1. Sample the frequency and waveform signal currently used by the electrode; S2. Convert the current frequency signal into a corresponding voltage signal and then perform truncation; S3. Detect the truncation progress, and initialize the circuit after the detection is completed; S4. Connect the gear position of the selection code switch to the truncated signal, and convert the truncated signal into the previously adjusted frequency signal; S5. Convert the previously adjusted frequency signal into a required waveform through a waveform converter.

[0022] Refer to the attached Figure 1 , attached Figure 2 , in the centralized control replication circuit, the number of replication units corresponds to the number of frequencies to be intercepted. The Ports of each replication unit are connected in parallel to obtain the frequency voltage adjusted currently. After interception, it is input to the signal generation circuit through the V series connection terminals. The signal generation circuit includes multiple shared waveform generation pre-stage 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 the previously adjusted frequency signal, and then it is input to the waveform converter by the voltage-controlled oscillator to complete the waveform output required by the electrode (the voltage-controlled oscillator and the waveform converter are not illustrated in the attached drawings). The control method is to switch the selection code switch S2 to the VDD gear when intercepting frequencies, with a range of 0 - 1000 HZ for low frequencies. Then press the switch S1 to automatically perform interception. Just switch the selection code switch S2 during use. The switch S1 in the replication unit is the replication start switch. The inverting terminal of the operational amplifier U3 is connected to the Port to receive the frequency voltage. The non-inverting terminal of the operational amplifier U3 samples the voltage at the connection terminal 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. Assume the model of the digital potentiometer U2 is MAX5160, and the resistance value of this chip is 10K, then the resistance value of the resistor R8 is the same. The resistance value of the resistor R13 in the multi-waveform pre-stage circuit corresponds to the resistance value of the digital potentiometer U2, and the resistor R16 corresponds to the resistance value of the resistor R8. The signal at the output terminal of the operational amplifier U3 is fed back to the 1CLK pin of the flip-flop U4, aiming to copy the corresponding adjusted resistance value and voltage to the digital potentiometer U2 after the input of the Port, and then input the voltage at the connection terminal of the L pin of the digital potentiometer U2 and the resistor R8 to other shared waveform generation pre-stage units to complete the interception of the frequency points.

[0023] Refer to the attached Figure 1, in another embodiment, based on the above solution, the detection of the interception progress and automatic initialization are added. Compared with the above solution, it can avoid the high-duration standby caused by manual initialization or the fault interruption of manual stop control when the copy progress is not completed. Since there are two output states in the operational amplifier U3 during the resistance copying process, that is, two output results from 1 to 0 or from 0 to 1, a single high or low level cannot be used for reset during initialization at this time. Therefore, the problem to be solved is that regardless of the comparison result between the currently copied resistance and the voltage at the connection end of the resistor R13 and the resistor R16 in the shared waveform generation front-end unit after resistance adjustment (which is also the input voltage of the voltage-controlled oscillator), both output results need to be forced to change from 1 to 0 or from 0 to 1, and then this change process is used as the stop signal for the resistance copying of the digital potentiometer U2. In the solution, the output of the AND gate U1 is used, so the output result from 0 to 1 is used. The specific signal change is that while the signal at the output end of the operational amplifier U3 is input to the U / D pin of the digital potentiometer U2, it 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 first 1 and then 0, when the operational amplifier U3 outputs, the signal passes through the source of the field-effect transistor Q2 and is pulled up by the resistor R9 and then input to the diode D3 and the diode D4 respectively. The signal of the diode D4 is fed back to the base of the triode Q3 to make the triode Q3 conduct. The power supply of the collector of the triode Q3 is pulled up through the resistor R12 and grounded and then fed back to the control pole of the thyristor D2, and the thyristor D2 conducts. The 1Q pin of the flip-flop U4 passes through the anode of the thyristor D2, the resistor R10 and the grounded circuit. The 5 pin of the flip-flop U4 is the 1Q pin, the 6 pin is the inverted 1Q pin and is connected to 1D. When the switch S1 is in the attached figure state, there is no output at the 1Q pin and the inverted 1Q pin outputs. When the switch S1 is actuated, the 1Q pin outputs and the inverted 1Q pin does not output. Subsequently, the signal at the connection end of the resistor R10 and the cathode of the thyristor D2 is input to one end of the AND gate U1. At the same time, after the diode D3 conducts, the signal at the source of the field-effect transistor Q2 is also fed back to the base of the triode Q1. The emitter of the triode Q1 is powered by the voltage divided by the resistors R3 and R2. The voltage input to the diode D3 through the conduction of the field-effect transistor Q2 is higher than the base of the triode Q1. After the triode Q1 is biased, it cuts off and the thyristor D1 has no output. Along with the signal fed back from the output end of the operational amplifier U3 to the U / D pin of the digital potentiometer U2 and the input of the INC inverted pin of the digital potentiometer U2, after the resistance value of the digital potentiometer U2 is adjusted step by step to approach and be consistent with the resistor R13, the output of the operational amplifier U3 is 0. At this time, the field-effect transistor Q2 cuts off. The power supply signal at the connection end of the resistors R3 and R2 passes through the emitter of the triode Q1 and the resistor R4 circuit. The triode Q1 conducts and passes through the resistor R5 circuit and then is input to the control pole of the thyristor D1. The signal of the 1Q pin of the flip-flop U4 passes through the thyristor D1 and the resistor R6 grounded circuit. The signal at the connection end of the cathode of the thyristor D1 and the resistor R6 is input to the other input pin of the AND gate U1. The output signal of the AND gate U1 is input to the 1CLK pin of the flip-flop U4, and there is no output at the 1Q pin of the flip-flop U4.The 1Q reverse pin outputs again to complete the forced change of the first result. If the output process of operational amplifier U3 is first 0 and then 1, triode Q1 is initially in the cut-off state. At this time, after switch S1 is closed, the 1Q pin of flip-flop U4 is input to the anodes of thyristor D1 and thyristor D2. Since there is no signal input to diode D3 and diode D4, the voltage at the connection end of resistor R3 and resistor R2 conducts after passing through the emitter, base, and resistor R4 loop of triode Q1, and the collector voltage is input to the control electrode of thyristor D1, causing thyristor D1 to conduct. As the resistance value adjusted by digital potentiometer U2 gradually approaches and becomes consistent with resistor R13, the output of operational amplifier U3 is 1, and field effect transistor Q2 conducts. The signal is fed back to the base of triode Q1 through diode D3, and triode Q1 cuts off. There is a forward current from the anode to the cathode of thyristor D1 and a positive voltage at the anode. The voltage signal at the connection end of the cathode of thyristor D1 and resistor R6 is fed back to one input terminal of AND gate U1. When field effect transistor Q2 conducts, triode Q3 also conducts, and its collector power supply is fed back to thyristor D2 after passing through triode Q3 and resistor R12 loop, enabling thyristor D2 to also have a forward current. The signal at the connection end of the cathode of thyristor D2 and resistor R10 is fed back to the other input terminal of AND gate U1. The output signal of AND gate U1 is input to the 1CLK pin of flip-flop U4, and there is no output at the 1Q pin of flip-flop U4, and the 1Q reverse pin outputs again to complete the forced change of the second result. The two results are forced to be first 0 and then 1. Assuming that the flip-flop U4 uses a model with low-level setting, the result is forced to be first 1 and then 0, and the AND gate U1 can be replaced with a NAND gate.

[0024] See the appendix Figure 2, in one embodiment, the input of the port frequency voltage uses a shared waveform generation pre-stage unit instead of a voltage-controlled oscillator. When connecting, one of them can be connected to the replication unit to complete the frequency interception of all replication units. The Out can default to output a square wave signal, reducing the number of waveform converters set. The adjustment resistor R13 in the circuit can adjust the output frequency of Out. 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 divided signals of the corresponding frequency voltage 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 in parallel. The resistor R14 is used for current limiting, and the capacitor C1 is used for filtering and integrating and feedback 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 at the capacitor C1 terminal. The signal output from its output terminal is fed back to the 1CLK pin of the flip-flop U7 through the diode D6. The signal output from the 1Q pin of the flip-flop U7 goes to the base of the triode Q4, and the triode Q4 conducts. The power supply is fed back to the capacitor C1 through the collector, emitter, and resistor R14 of the triode Q4. At the same time, there is no output at the 1Q bar pin of the flip-flop U7, and the triode Q5 is cut off. When the voltage at the capacitor C1 terminal rises to the divided voltage at the inverting terminal of the operational amplifier U5, the signal output from the operational amplifier U5 is fed back to the 1CLK pin of the flip-flop U7 through the diode D5. The 1Q bar pin of the flip-flop U7 outputs a signal to the base of the triode Q5, and the triode Q5 conducts. The voltage at the capacitor C1 terminal returns to the initial power-on state through the resistor R20, the collector, emitter, and ground terminal loop of the triode Q5. Subsequently, the operational amplifier U6 outputs again. The diodes D5 and D6 are used for signal de-inversion to avoid grounding loops through the output terminals with each other.

[0025] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to embrace all changes within the meaning and scope of the equivalent elements of the claims in the present invention. Any mark in the claims should not be regarded as limiting the claimed rights.

Claims

1. A neuromuscular electrical stimulation control circuit based on bio-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 a plurality of replication units, and the number of replication units is the same as the number of frequency points to be intercepted. The replication unit includes an operational amplifier, a trigger, a digital potentiometer, a switch, and a resistor; One end of S1 of the switch, the H pin, W pin, VDD pin of the digital potentiometer U2, the CLR pin, 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 reverse 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 non-inverting input end of the operational amplifier U3 and the V1 end are connected; the CS reverse pin of the digital potentiometer U2 is connected to the 1D pin and 1Q reverse pin of the trigger U4; the inverting input 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 are connected to the ground terminal.

2. The neuromuscular electrical stimulation control circuit based on bio-signal feedback according to claim 1, characterized in that The replication unit further includes several triodes, several thyristors, several diodes, several resistors, field effect transistors, and AND gates; The base of the triode Q1 in the several triodes 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, and 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 one end of the resistor R9, the drain, the collector of the triode Q3, and the other end of the resistor R3 are connected to the power supply; the emitter of the triode Q3 is connected to the control electrode of the thyristor D2 and one end of the resistor R12; the anode of the thyristor D1, the anode of the thyristor D2 are connected to the 1Q pin of the trigger U4, and the cathode is connected to the first input end of the AND gate U1 and one end of the resistor R6; the cathode of the thyristor D2 is connected to the second input end of the AND gate U1 and one end of the resistor R10; the output end of the AND gate U1 is connected to the 1CLK pin of the trigger U4; the other ends of the resistor R2, the resistor R4, the resistor R5, the resistor R6, the resistor R9, the resistor R10, and the resistor R12 are connected to the ground terminal.

3. The neuromuscular electrical stimulation control circuit based on bio-signal feedback according to claim 1, wherein The signal generation circuit includes a plurality of common waveform generation pre-stage units and a plurality of waveform converters. The common waveform generation pre-stage units include several operational amplifiers, several resistors, several diodes, triggers, and code selection switches; The non-inverting input terminal of operational amplifier U5, the inverting input terminal of operational amplifier U6, one end of capacitor C1, one end of resistor R14, and one end of resistor R20 in the several operational amplifiers are connected; the inverting input terminal is connected to one end of resistor R15 and one end of resistor R17; the output terminal is connected to the anode of diode D5; the non-inverting input terminal of operational amplifier U6 is connected to the other end of resistor R17 and one end of resistor R18; the output terminal is connected to the anode of diode D6; the CLR pin, PRE pin, collector of triode Q4 of flip-flop U7 are connected to the power supply, the 1D pin, 1Q inverse pin, base of triode Q5 are connected to the Out terminal, 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 triode Q4; the emitter of triode Q4 is connected to the other end of resistor R14; the collector of triode Q5 is connected to the other end of resistor R20; one end of resistor R13, the other end of resistor R15, one end of resistor R16 are connected to the Port terminal, and the other end is connected to the selection code switch S2 terminal; the Out terminal is connected to a plurality of waveform converters; the emitter of triode Q5, the other end of capacitor C1, the other end of resistor R16, the other end of resistor R18, and the other end of resistor R19 are connected to the ground terminal.

4. The neuromuscular electrical stimulation control circuit based on bio-signal feedback according to claim 1, wherein, The signal generation circuit includes a voltage-controlled oscillator and a waveform converter. The input terminal of the voltage-controlled oscillator is connected to V1 in the replication unit, which is used to convert the V1 voltage into a waveform signal. The output terminal of the voltage-controlled oscillator is connected to the waveform converter, which is used to convert it into different waveform signals.

5. The neuromuscular electrical stimulation control circuit based on bio-signal feedback according to claim 1, wherein The replication unit further includes several resistors; One end of resistor R1 in the several resistors is connected to the 1Q pin of flip-flop U4; one end of resistor R7 is connected to the 1CLK pin of flip-flop U4; one end of resistor R11 is connected to the U / D inverse pin of digital potentiometer U2; the other end of resistor R1, the other end of resistor R7, and the other end of resistor R11 are connected to the ground terminal.

6. The neuromuscular electrical stimulation control circuit based on bio-signal feedback according to claim 3, characterized in that, The resistor R13 is an adjustable resistor.

7. A neuromuscular electrical stimulation control method based on bio-signal feedback, characterized in that, It includes the following steps: 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 perform interception; S3. Detect the progress of the interception, and initialize the circuit after the detection is completed; S4. Connect the gear position of the selection code switch to the intercepted signal, and convert the intercepted signal into a previously adjusted frequency signal; S5. Convert the previously adjusted frequency signal into the required waveform through the waveform converter.

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