Control circuit of multimode electric physiotherapy instrument

Abstract

The control circuit comprises a power supply (1) and a pole piece group (7), and the power supply (1) is connected with a voltage stabilization control circuit (2) and a low-voltage inverter circuit (3); the output side of the low-voltage inverter circuit (3) is provided with a booster circuit (4), the output end of the booster circuit (4) is connected with a multi-path on-off inverter circuit (5), and the output end of the multi-path on-off inverter circuit (5) is connected with a high-voltage shaping circuit (6); the voltage stabilization control circuit (2) is respectively connected with the power supply (1), the low-voltage inverter circuit (3), the multi-path on-off inverter circuit (5) and the high-voltage shaping circuit (6); voltage of various waveforms is provided in a circuit on-off combination mode, various physical therapy voltage sections can be generated, and the device has the advantages of being flexible to use, wide in adjusting range and fast and convenient to control; in addition, multiple voltage stabilization protection is achieved, and the use safety is improved.

Description

Technical Field

[0001] The invention relates to the field of electrical therapy apparatus, and in particular to a control circuit of a multi-mode electrical therapy apparatus. Background Art

[0002] Workers who engage in heavy physical labor and athletes who undergo high-intensity physical training often suffer from chronic diseases such as muscle strain, rheumatism, rheumatoid arthritis and intervertebral disc pain, which cause serious physical and psychological pain. The treatment of the above diseases can be divided into drug therapy and physical therapy. Drug therapy mainly relies on analgesics to relieve pain, but it is easy to cause the side effect of drug resistance; physical therapy has a good therapeutic effect on the above diseases and has been proven to be a more obvious method to relieve soft tissue injuries; among them, electric physical therapy is a commonly used physical therapy method, such as electroacupuncture, electric physical therapy, etc., which can effectively relieve the above symptoms; At present, AC medium frequency electrotherapy is widely used in clinical practice, which mainly generates a medium frequency AC constant current source to act on the affected area, thereby achieving the therapeutic effect. The Chinese patent with application number 202111491582.4 discloses a constant current modulated medium frequency physiotherapy device circuit and its working principle. It can realize any combination and arbitrary adjustment of continuous modulation, intermittent modulation, discontinuous modulation and modulation of output sine waves, triangle waves and square waves, and can avoid the current of a single frequency and a single waveform from causing the human body to adapt. This scheme is implemented using the DDS method, and the waveform that can be controlled is realized by relying on pre-configured waveform data. There are certain band limitations and the adjustment range is limited. In addition, this application adopts a current source scheme with an output current of up to 100mA. However, there is no overvoltage protection when using the current source scheme. Due to the different physique of the human body and the placement of the physiotherapy device, its resistance varies greatly, even up to tens of megohms. At this time, even a current of only 0.1mA may generate a voltage of several hundred volts, which poses certain safety hazards and is not safe. Summary of the invention

[0003] The purpose of the present invention is to provide a control circuit for a multi-mode electrical therapy instrument. The present invention provides voltages of various waveforms by combining circuit on and off, and can generate various therapy voltage sections, which has the characteristics of flexible use, wide adjustment range, and fast control; in addition, the present invention also has multiple voltage stabilization protections, which improves the safety of use.

[0004] The technical solution provided by the present invention is as follows: a control circuit of a multi-mode electrical therapy instrument, comprising a power supply and an electrode group, wherein the power supply is connected to a voltage stabilization control circuit and a low-voltage inverter circuit; a boost circuit is arranged on the output side of the low-voltage inverter circuit, the output end of the boost circuit is connected to a multi-channel on-off inverter circuit, and the output end of the multi-channel on-off inverter circuit is connected to a high-voltage shaping circuit; the voltage stabilization control circuit is respectively connected to the power supply, the low-voltage inverter circuit, the multi-channel on-off inverter circuit and the high-voltage shaping circuit; the voltage stabilization control circuit is used to obtain the voltage and current of the power supply, and calculate the control signals corresponding to the low-voltage inverter circuit, the multi-channel on-off inverter circuit and the high-voltage shaping circuit according to the voltage and current of the power supply; the low-voltage inverter circuit After receiving the corresponding control signal, the voltage of the power supply is inverted with a controllable output value and an AC voltage is output; the boost circuit boosts the AC voltage of the low-voltage inverter circuit and outputs the boost voltage; after receiving the corresponding control signal, the multi-channel on-off inverter circuit inverts and waveform controls the boost voltage of the boost circuit through a combination of multiple circuits on and off and outputs a waveform voltage; after receiving the corresponding control signal, the high-voltage shaping circuit shapes the waveform voltage of the multi-channel on-off inverter circuit and switches the waveform through circuit on and off, and finally outputs it to the electrode group; thus, the electrical physiotherapy device generates physiotherapy voltages of various waveforms through the waveform control of the multi-channel on-off inverter circuit and the waveform switching of the high-voltage shaping circuit.

[0005] In the control circuit of the above-mentioned multi-mode electrical therapy instrument, the low-voltage inverter circuit includes NMOS tubes Q1, NMOS tubes Q2, NMOS tubes Q3, NMOS tubes Q4 and a step-up transformer T1; the drain of the NMOS tube Q1 is connected to the positive pole of the power supply and the drain of the NMOS tube Q2, the source of the NMOS tube Q2 is connected to the drain of the NMOS tube Q4, the source of the NMOS tube Q1 is connected to the drain of the NMOS tube Q3, the source of the NMOS tube Q3 is connected to the source of the NMOS tube Q4 and The negative electrode of the power supply; one end of the input side of the boost transformer T1 is connected to the source of the NMOS tube Q1 and the drain of the NMOS tube Q3, and the other end of the input side of the boost transformer T1 is connected to the source of the NMOS tube Q2 and the drain of the NMOS tube Q4; the gate and drain of the NMOS tube Q1, the gate and drain of the NMOS tube Q2, the gate of the NMOS tube Q3 and the gate of the NMOS tube Q4 are connected to the voltage stabilization control circuit; the output side of the boost transformer T1 is connected to the boost circuit.

[0006] In the control circuit of the aforementioned multi-mode electrical therapy apparatus, the boost circuit includes capacitors C1, C2, C3, C4, C5, C6, C7, C8, C9, C 10 , capacitor C 11, diode D1, diode D2, diode D3, diode D4, diode D5, diode D6, diode D7, diode D8, diode D9, diode D 10 and diode D 11 One end of the capacitor C1 is connected to the output terminal of the low voltage inverter circuit, and the other end of the capacitor C1 is connected in series with capacitors C3, C5, C7, C9 and C 11 The first charging circuit is formed, one end of the capacitor C2 is connected to the other end of the output end of the low voltage inverter circuit, and the other end of the capacitor C2 is connected in series with capacitors C4, C6, C8 and C 10 The second charging circuit is formed; the end of the first charging circuit is connected to a multi-way on-off inverter circuit; the diode D1, the diode D2, the diode D3, the diode D4, the diode D5, the diode D6, the diode D7, the diode D8, the diode D9, the diode D 10 and diode D 11 The circuit is connected between the first charging circuit and the second charging circuit in the form of a voltage doubling circuit.

[0007] In the control circuit of the aforementioned multi-mode electrical therapy apparatus, the multi-channel on-off inverter circuit includes resistors R3, R4, R5, R6, R7, R8, R9, and R 10 , resistor R 11 , resistor R 12 , resistor R 13 , resistor R 14, high-voltage optocoupler OP1, high-voltage optocoupler OP2, high-voltage optocoupler OP3, high-voltage optocoupler OP4, PIGBT tube Q5, NIGBT tube Q6, PIGBT tube Q7, NIGBT tube Q8 and boost transformer T2; the emitter of the PIGBT tube Q5 is connected to the output end of the boost circuit and one end of the resistor R3, the collector of the PIGBT tube Q5 is connected to the collector of the NIGBT tube Q6 and one pole of the input side of the boost transformer T2, the gate of the PIGBT tube Q5 is connected to the other end of the resistor R3 and the C pole of the high-voltage optocoupler OP1, the E pole of the high-voltage optocoupler OP1 is connected to the weak current circuit via the resistor R5, and the negative pole of the high-voltage optocoupler OP1 is grounded; the NIGBT tube Q6 The emitter of the PIGBT tube Q7 is grounded, the gate of the NIGBT tube Q6 is connected to one end of the resistor R6, one end of the resistor R7 and the C pole of the high-voltage optocoupler OP2, the other end of the resistor R6 is connected to the output end of the boost circuit, the E pole of the high-voltage optocoupler OP2 is connected to the other end of the resistor R7 and grounded, and the positive pole of the high-voltage optocoupler OP2 is connected to the power supply voltage; the emitter of the PIGBT tube Q7 is connected to the output end of the boost circuit and one end of the resistor R9, the collector of the PIGBT tube Q7 is connected to the collector of the NIGBT tube Q8 and the other pole on the input side of the boost transformer T2, the gate of the PIGBT tube Q7 is connected to the other end of the resistor R9 and the C pole of the high-voltage optocoupler OP3, and the E pole of the high-voltage optocoupler OP3 is connected to the power supply voltage through the resistor R 11 Connect the weak current circuit, the negative electrode of the high voltage optocoupler OP1 is grounded; the emitter of the NIGBT tube Q8 is grounded, and the gate of the NIGBT tube Q8 is connected to the resistor R 12 One end of the resistor R 13 One end of the resistor R 12 The other end is connected to the output end of the boost circuit, and the E pole of the high-voltage optocoupler OP4 is connected to the resistor R 13 The other end is connected to the ground, the positive electrode of the high-voltage optocoupler OP4 is connected to the power supply voltage; the positive electrode of the high-voltage optocoupler OP1 is connected to one end of the resistor R4, the negative electrode of the high-voltage optocoupler OP2 is connected to one end of the resistor R8, and the positive electrode of the high-voltage optocoupler OP3 is connected to the resistor R 10 The negative electrode of the high-voltage optocoupler OP4 is connected to the resistor R 14 one end of the resistor R4, the other end of the resistor R8, and the resistor R 10 The other end and resistor R 14 The other end is connected to the output end of the voltage stabilization control circuit; the output side of the step-up transformer T2 is connected to the high voltage shaping circuit.

[0008] In the control circuit of the multi-mode electrical therapy apparatus, the high voltage shaping circuit includes a resistor R 15 , capacitor C 12 and relay KA, the resistor R 15 One end of the resistor R is connected to the output terminal of the multi-channel on-off inverter circuit. 15The other end is connected to one electrode of the electrode group and the capacitor C 12 One end of the capacitor C 12 The other end of the relay KA is connected to another pole piece of the pole piece group and another pole of the output end of the multi-way on-off inverter circuit; the relay KA and the resistor R 15 In parallel, the control end of relay KA is connected to the output end of the voltage stabilizing control circuit.

[0009] In the control circuit of the aforementioned multi-mode electrical therapy instrument, the voltage stabilization control circuit includes an MCU, a shunt resistor R sh , resistor R cf , resistor R1, resistor R2, capacitor C cf , capacitor C vf and a voltage stabilizing module, the power supply end of the MCU is connected to the power supply voltage via the voltage stabilizing module; the shunt resistor R sh Connect the power supply voltage, resistor R cf One end of the shunt resistor R sh One end of the resistor R cf The other end of the capacitor C cf One end and the sampling end AD1 of MCU, capacitor C cf The other end of the shunt resistor R sh one end of the resistor R1 is connected to the power supply voltage, the other end of the resistor R1 is connected to one end of the resistor R2, the capacitor C vf One end of the resistor R2 is connected to the sampling terminal AD2 of the MCU, and the other end of the resistor R2 is connected to the capacitor C vf The other end of the MCU; the signal output end is connected to a low-voltage inverter circuit, a multi-channel on-off inverter circuit and a high-voltage shaping circuit.

[0010] Compared with the prior art, the power supply voltage of the present invention is converted into an AC voltage within a certain range through a low-voltage inverter circuit, and the AC voltage is further inverted and waveform-controlled by a multi-channel on-off inverter circuit after being boosted by a boost circuit. The waveform voltage of the multi-channel on-off inverter circuit is finally output to a pole piece group after being shaped and waveform-switched by a high-voltage shaping circuit, and voltages of various waveforms are provided through the waveform control of the multi-channel on-off inverter circuit and the waveform switching of the high-voltage shaping circuit. Compared with the DSS method, a high-voltage shaping circuit is creatively provided to perform shaping and waveform switching, and further combinations are made on the basis of the original waveform to increase the number of achievable waveforms, which has the characteristics of flexible use, wide adjustment range, and quick control. In addition, the present invention performs multiple voltage stabilization protections on the voltage through a voltage stabilization control circuit and a low-voltage inverter circuit, thereby improving the safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a circuit diagram of the present invention;

[0012] Figure 2The modulation principle diagram of the symmetrical AC triangle wave of the present invention;

[0013] Figure 3 The modulation principle diagram of the unipolar triangle wave of the present invention;

[0014] Figure 4 The modulation principle diagram of the square wave of the present invention;

[0015] Figure 5 This is the modulation principle of the sine wave of the present invention.

[0016] The markings in the attached figure are: 1. power supply; 2. voltage stabilization control circuit; 3. low voltage inverter circuit; 4. boost circuit; 5. multi-channel on-off inverter; 6. high voltage shaping circuit; 7. pole piece group; 8. voltage stabilization module. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with the embodiments and drawings, but they are not intended to limit the present invention.

[0018] Embodiment: A control circuit of a multi-mode electrical therapy apparatus, as shown in the attached Figure 1 shown, including output V E The power supply 1 and the electrode group 7 are connected to the power supply 1 with a voltage stabilization control circuit 2 and a low-voltage inverter circuit 3; the output side of the low-voltage inverter circuit 3 is provided with a boost circuit 4, the output end of the boost circuit 4 is connected to a multi-channel on-off inverter circuit 5, and the output end of the multi-channel on-off inverter circuit 5 is connected to a high-voltage shaping circuit 6; the voltage stabilization control circuit 2 is respectively connected to the power supply 1, the low-voltage inverter circuit 3, the multi-channel on-off inverter circuit 5 and the high-voltage shaping circuit 6; the voltage stabilization control circuit 2 is used to obtain the voltage and current of the power supply 1, and calculate the control signals corresponding to the low-voltage inverter circuit 3, the multi-channel on-off inverter circuit 5 and the high-voltage shaping circuit 6 according to the voltage and current of the power supply 1; the low-voltage inverter circuit 3 receives the corresponding After receiving the control signal, the voltage of the power supply 1 is inverted with a controllable output value and an AC voltage is output; the boost circuit 4 boosts the AC voltage of the low-voltage inverter circuit 3 and outputs the boost voltage; after receiving the corresponding control signal, the multi-channel on-off inverter circuit 5 inverts and waveform controls the boost voltage of the boost circuit 4 through a combination of multiple circuits on and off and outputs a waveform voltage; after receiving the corresponding control signal, the high-voltage shaping circuit 6 shapes the waveform voltage of the multi-channel on-off inverter circuit 5 and switches the waveform through circuit on and off, and finally outputs it to the electrode group 7; thus, through the waveform control of the multi-channel on-off inverter circuit and the waveform switching of the high-voltage shaping circuit, the electrical physiotherapy device generates physiotherapy voltages of various waveforms.

[0019] The low voltage inverter circuit comprises NMOS tube Q1, NMOS tube Q2, NMOS tube Q3, NMOS tube Q4 and a step-up transformer T1 with a turn ratio of 1:N1; the drain of the NMOS tube Q1 is connected to the positive electrode of the power supply and the drain of the NMOS tube Q2, the source of the NMOS tube Q2 is connected to the drain of the NMOS tube Q4, the source of the NMOS tube Q1 is connected to the drain of the NMOS tube Q3, and the source of the NMOS tube Q3 is connected to the source of the NMOS tube Q4 and the negative electrode of the power supply; one end of the input side of the step-up transformer T1 is connected to the NMOS tube Q1. The source of the S transistor Q1 and the drain of the NMOS transistor Q3, the other end of the input side of the step-up transformer T1 is connected to the source of the NMOS transistor Q2 and the drain of the NMOS transistor Q4, forming an H-bridge inverter circuit; the gate and drain of the NMOS transistor Q1, the gate and drain of the NMOS transistor Q2, the gate of the NMOS transistor Q3 and the gate of the NMOS transistor Q4 are connected to the voltage stabilization control circuit; the output side of the step-up transformer T1 is connected to the step-up circuit; the step-up transformer T1 realizes step-up and isolation transmission of energy, and the H-bridge inverter circuit converts the low-voltage DC power supply V E Inverted into higher voltage AC power, the PWM port signals H1, H2, PWM1 and PWM2 of the MCU in the voltage stabilization control circuit are connected to the gates of NMOS tubes Q1, NMOS tubes Q2, NMOS tubes Q3 and NMOS tubes Q4 respectively, and the COM1 and COM2 ports of the MCU are connected to the drains of NMOS tubes Q1 and NMOS tubes Q2 respectively. H1, COM1 and H2, COM2 contain voltage pumping circuits to meet the driving voltage requirements of the upper tubes NMOS tubes Q1 and NMOS tubes Q2. The MCU adjusts the duty cycle of the driving signals of NMOS tubes Q1, NMOS tubes Q2, NMOS tubes Q3 and NMOS tubes Q4 to achieve low-voltage inverter circuit regulation of the output voltage and output energy of the entire circuit, ensuring that the output voltage and output energy of the physiotherapy instrument are within a safe range.

[0020] The boost circuit includes capacitors C1, C2, C3, C4, C5, C6, C7, C8, C9, C 10 , capacitor C 11 , diode D1, diode D2, diode D3, diode D4, diode D5, diode D6, diode D7, diode D8, diode D9, diode D 10 and diode D 11 One end of the capacitor C1 is connected to the output terminal of the low voltage inverter circuit, and the other end of the capacitor C1 is connected in series with capacitors C3, C5, C7, C9 and C 11 The first charging circuit is formed, one end of the capacitor C2 is connected to the other end of the output end of the low voltage inverter circuit, and the other end of the capacitor C2 is connected in series with capacitors C4, C6, C8 and C 10The second charging circuit is formed; the end of the first charging circuit is connected to a multi-way on-off inverter circuit; the diode D1, the diode D2, the diode D3, the diode D4, the diode D5, the diode D6, the diode D7, the diode D8, the diode D9, the diode D 10 and diode D 11 It is connected between the first charging circuit and the second charging circuit in the form of a voltage doubling circuit to achieve the functions of rectification and boosting. From the knowledge of electrical engineering, it is known that capacitor C2-capacitor C 11 The voltage of each capacitor is twice the voltage of capacitor C1, so capacitors C3, C5, C7, C9 and C 11 The voltage of the five series capacitors is related to the capacitors C2, C4, C6, C8 and C 10 The voltage of the five series capacitors is equal, which is 10 times the voltage of capacitor C1. The capacitor voltage doubling method reduces the voltage and current stress, volume and cost of the boost transformer T1. If you want to achieve a higher boost, you only need to add a few more boost units.

[0021] The multi-channel on-off inverter circuit includes a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R 10 , resistor R 11 , resistor R 12 , resistor R 13 , resistor R 14 , high-voltage optocoupler OP1, high-voltage optocoupler OP2, high-voltage optocoupler OP3, high-voltage optocoupler OP4, PIGBT tube Q5, NIGBT tube Q6, PIGBT tube Q7, NIGBT tube Q8 and a step-up transformer T2 with a turns ratio of 1:N2; the emitter of the PIGBT tube Q5 is connected to the output end of the boost circuit and one end of the resistor R3, the collector of the PIGBT tube Q5 is connected to the collector of the NIGBT tube Q6 and one pole of the input side of the step-up transformer T2, the gate of the PIGBT tube Q5 is connected to the other end of the resistor R3 and the C pole of the high-voltage optocoupler OP1, the E pole of the high-voltage optocoupler OP1 is connected to the weak current circuit via the resistor R5, and the negative pole of the high-voltage optocoupler OP1 is grounded; the NIGB The emitter of the T tube Q6 is grounded, the gate of the NIGBT tube Q6 is connected to one end of the resistor R6, one end of the resistor R7 and the C pole of the high-voltage optocoupler OP2, the other end of the resistor R6 is connected to the output end of the boost circuit, the E pole of the high-voltage optocoupler OP2 is connected to the other end of the resistor R7 and grounded, and the positive pole of the high-voltage optocoupler OP2 is connected to the power supply voltage; the emitter of the PIGBT tube Q7 is connected to the output end of the boost circuit and one end of the resistor R9, the collector of the PIGBT tube Q7 is connected to the collector of the NIGBT tube Q8 and the other pole on the input side of the boost transformer T2, the gate of the PIGBT tube Q7 is connected to the other end of the resistor R9 and the C pole of the high-voltage optocoupler OP3, and the E pole of the high-voltage optocoupler OP3 is connected to the power supply voltage via the resistor R11 Connect the weak current circuit, the negative electrode of the high voltage optocoupler OP1 is grounded; the emitter of the NIGBT tube Q8 is grounded, and the gate of the NIGBT tube Q8 is connected to the resistor R 12 One end of the resistor R 13 One end of the resistor R 12 The other end is connected to the output end of the boost circuit, and the E pole of the high-voltage optocoupler OP4 is connected to the resistor R 13 The other end is connected to the ground, the positive electrode of the high-voltage optocoupler OP4 is connected to the power supply voltage; the positive electrode of the high-voltage optocoupler OP1 is connected to one end of the resistor R4, the negative electrode of the high-voltage optocoupler OP2 is connected to one end of the resistor R8, and the positive electrode of the high-voltage optocoupler OP3 is connected to the resistor R 10 The negative electrode of the high-voltage optocoupler OP4 is connected to the resistor R 14 one end of the resistor R4, the other end of the resistor R8, and the resistor R 10 The other end and resistor R 14 The other end is connected to the output end of the voltage stabilizing control circuit; the output side of the step-up transformer T2 is connected to the high-voltage shaping circuit; the resistor R3, the resistor R4, the resistor R5 and the high-voltage optical coupler OP1 form a PIGBT tube Q5 drive circuit, and the Drive1 of the MCU in the voltage stabilizing control circuit drives and controls the on and off of the PIGBT tube Q5; the resistor R6, the resistor R7, the resistor R8 and the high-voltage optical coupler OP2 form a NIGBT tube Q6 drive circuit, and the Drive2 of the MCU drives and controls the on and off of the NIGBT tube Q6; the resistor R9, the resistor R 10 , resistor R 11 The PIGBT tube Q7 drive circuit is composed of the high-voltage optical coupler OP3. The MCU's Drive3 drives the PIGBT tube Q7 to turn on and off. The resistor R 12 , resistor R 13 , resistor R 14and the high-voltage optical coupler OP4 form a NIGBT tube Q8 driving circuit, and the Drive4 of the MCU drives and controls the on and off of the NIGBT tube Q8; the PIGBT tube Q5, the NIGBT tube Q6, the PIGBT tube Q7, and the NIGBT tube Q8 form a high-voltage H-bridge inverter circuit to invert the high voltage HV+ of the boost circuit, and the boost transformer T2 realizes further boosting and isolation and transfer of energy, and inverts HV+ into a higher voltage AC; because the reverse voltage of the HV+ high-voltage H-bridge is too high, its upper bridge arm power tube cannot adopt the voltage pumping scheme of the NMOS tube Q1 and the NMOS tube Q2 in the low-voltage inverter circuit. The upper bridge arm power tube of the high-voltage inverter circuit of the present invention adopts a P-type IGBT, and uses the HV+ high voltage to drive the PIGBT tube Q5 and the PIGBT tube Q7. The principle is: when Drive1 is at a low level, the output end of the high-voltage optical coupler OP1 is cut off (i.e., the C pole and the E pole), the emitter and gate voltages of the PIGBT tube Q5 are zero, and the PIGBT tube is cut off; ... When Drive2 is at a high level, the output end of the high-voltage optocoupler OP1 is turned on, the resistors R6 and R7 are connected in series between HV+ and HVGND, and the emitter and gate voltages of the PIGBT tube Q5 are the voltages on the resistor R3. By selecting the resistance values ​​of the resistors R3 and R5, the conduction of the high-voltage optocoupler OP1 and the PIGBT tube Q5 is ensured; similarly, when Drive2 is at a high level, the high-voltage optocoupler OP2 is turned off, the resistors R6 and R7 are connected in series between HV+ and HVGND, and the gate and The emitter voltage is the voltage on the resistor R7. By selecting the resistance values ​​of the resistors R6 and R7, it is ensured that the NIGBT tube Q6 is saturated and turned on; when Drive2 is at a low level, the high-voltage optocoupler OP2 is saturated and turned on. Since the resistor R7 is connected in parallel with the output end of the high-voltage optocoupler OP2, the voltage across the resistor R7 is very small, and the NIGBT tube Q6 is cut off; the working principles of the PIGBT tubes Q7 and NIGBT tubes Q8 on the other bridge arm are the same as those of the PIGBT tubes Q5 and NIGBT tubes Q6.

[0022] The high voltage shaping circuit includes a resistor R 15 , capacitor C 12 and relay KA, the resistor R 15 One end of the resistor R is connected to the output terminal of the multi-channel on-off inverter circuit. 15 The other end is connected to one electrode of the electrode group and the capacitor C 12 One end of the capacitor C 12 The other end of the relay KA is connected to another pole piece of the pole piece group and another pole of the output end of the multi-way on-off inverter circuit; the relay KA and the resistor R 15 In parallel, the control end of relay KA is connected to the output end of the voltage stabilization control circuit; the resistor R 15 With resistor R 15 A first-order RC series circuit is formed and connected to the step-up transformer T2; at both ends of the secondary winding, the relay KA is connected in parallel with the resistor R15 Two ends; capacitor C 12 The two ends are connected to the two poles of the pole group, and the voltage v out Release electrical energy to the lesion site of the human body, the resistance R 15 With capacitor C 12 The circuit formed by the step-up transformer T2 reshapes the PWM signal at both ends of the secondary winding; when the relay KA is closed, v out Output PWM square wave voltage; when relay KA is disconnected, v out Output triangle wave or sine wave, for v out The output waveform and size can be adjusted.

[0023] The voltage stabilization control circuit includes an MCU, a shunt resistor R sh , resistor R cf , resistor R1, resistor R2, capacitor C cf , capacitor C vf and a voltage stabilizing module, the power supply end of the MCU is connected to the power supply voltage via the voltage stabilizing module; the shunt resistor R sh Connect the power supply voltage, resistor R cf One end of the shunt resistor R sh One end of the resistor R cf The other end of the capacitor C cf One end and the sampling end AD1 of MCU, capacitor C cf The other end of the shunt resistor R sh one end of the resistor R1 is connected to the power supply voltage, the other end of the resistor R1 is connected to one end of the resistor R2, the capacitor C vf One end of the resistor R2 is connected to the sampling terminal AD2 of the MCU, and the other end of the resistor R2 is connected to the capacitor C vf The other end of the MCU signal output terminal is connected to the low voltage inverter circuit, the multi-channel on-off inverter circuit and the high voltage shaping circuit; the resistor R sh Convert the power supply output current i into a voltage signal, and then cf and capacitor C cf The resistor R forms a first-order low-pass filter. sh The voltage is filtered to obtain the voltage signal v1; the resistors R1 and R2 divide the power supply voltage to obtain the voltage signal v2. When dividing the voltage, in order to meet the voltage requirements of AD sampling, the capacitor C vf The voltage regulator module filters the interference of v2. E The voltage is stabilized to 3.3V to power the MCU. The MCU controls the entire circuit, including the output voltage v out The size and power control as well as the output voltage v outWaveform control: MCU calculates the output power by sampling the power supply voltage and output current in real time, and calculates the output power based on the relationship between the battery output power, capacitor power and efficiency. The approximate value of the high voltage HV+ of the boost circuit is obtained, and then the duty ratios of the drive signals H1, H2, PWM1 and PWM2 of the NMOS tubes Q1, NMOS tubes Q2, NMOS tubes Q3 and NMOS tubes Q4 in the low-voltage inverter circuit are adjusted to stabilize HV+; secondly, the MCU out Waveform requirements (such as v out is an AC symmetrical triangle wave, a unipolar triangle wave, a sine wave or a PWM square wave), controls the waveform of the high voltage inverter circuit drive signal Drive1-Drive4 and the drive signal CTL of the relay KA, and realizes the v out control.

[0024] As attached Figure 2 As shown, it is known from the knowledge of electrical engineering that when the time constant τ of the first-order RC circuit is less than the charging or discharging pulse time, the waveform of charging and discharging at both ends of the capacitor is similar to a triangular wave. The smaller τ is, the more ideal the triangular wave is. Considering that the voltage peak value of the triangular wave needs to be higher, τ cannot be too small, so the present invention obtains an approximate triangular wave; and because the duty cycle of the drive waveforms of Drive1-Drive4 is 0.25, and the PWM waveforms of Drive1, Drive4 and Drive2, Drive3 are staggered and complementary, so v out It is a symmetrical AC triangle wave.

[0025] As attached Figure 3 As shown in the figure, since the duty cycle of the drive waveforms of Drive1-Drive4 is 0.5, and the PWM waveforms of Drive1, Drive4 and Drive2, Drive3 are interlaced and complementary, v out The charge charged during the conduction phase of Drive1 and Drive4 is fully released when Drive2 and Drive3 are turned on. If the capacitor C 12 When working, it carries no charge, so v out The waveform is a unipolar approximate triangle wave.

[0026] As attached Figure 4 As shown, since the relay KA connects the resistor R 15 short circuit, so v out The output is a square wave. At this time, the capacitor C 12 Used to eliminate high voltage spikes on the secondary output coil of step-up transformer T2 and stabilize V out effect.

[0027] As attached Figure 5 As shown, according to the SPWM modulation principle, the drive signals Drive1-Drive4 are Figure 5 The principle shown in the figure outputs a PWM wave. The output coil voltage on the secondary side of the step-up transformer T2 passes through the resistor R 15 and capacitor C 12 The voltage v obtained after filtering out That is a sine wave; by adjusting the attached Figure 5 The amplitude and frequency of the sine wave shown can adjust v out The effective value and frequency.

[0028] In summary, the power supply voltage of the present invention is converted into an AC voltage within a certain range through a low-voltage inverter circuit. After being boosted by a boost circuit, the AC voltage is further inverted and waveform-controlled by a multi-channel on-off inverter circuit. The waveform voltage of the multi-channel on-off inverter circuit is shaped and waveform-switched by a high-voltage shaping circuit and finally output to a pole piece group. Voltages of various waveforms are provided through waveform control of the multi-channel on-off inverter circuit and waveform switching of the high-voltage shaping circuit.

Claims

1. A control circuit of a multi-mode electrical therapy apparatus, comprising a power supply (1) and an electrode assembly (7), characterized in that: The power supply (1) is connected to a voltage stabilization control circuit (2) and a low-voltage inverter circuit (3); a boost circuit (4) is provided on the output side of the low-voltage inverter circuit (3); the output end of the boost circuit (4) is connected to a multi-channel on-off inverter circuit (5); the output end of the multi-channel on-off inverter circuit (5) is connected to a high-voltage shaping circuit (6); the voltage stabilization control circuit (2) is respectively connected to the power supply (1), the low-voltage inverter circuit (3), the multi-channel on-off inverter circuit (5) and the high-voltage shaping circuit (6); the voltage stabilization control circuit (2) is used to obtain the voltage and current of the power supply (1), and calculate the control signals corresponding to the low-voltage inverter circuit (3), the multi-channel on-off inverter circuit (5) and the high-voltage shaping circuit (6) according to the voltage and current of the power supply (1); the low-voltage inverter circuit (3) is connected to the high-voltage shaping circuit (6) After receiving the corresponding control signal, the voltage of the power supply (1) is inverted with a controllable output value and an AC voltage is output; the boost circuit (4) boosts the AC voltage of the low-voltage inverter circuit (3) and outputs the boost voltage; after receiving the corresponding control signal, the multi-channel on-off inverter circuit (5) inverts and controls the waveform of the boost voltage of the boost circuit (4) through a combination of multiple circuits on and off and outputs a waveform voltage; after receiving the corresponding control signal, the high-voltage shaping circuit (6) shapes the waveform voltage of the multi-channel on-off inverter circuit (5) and switches the waveform through circuit on and off, and finally outputs it to the electrode group (7); thus, through the waveform control of the multi-channel on-off inverter circuit (5) and the waveform switching of the high-voltage shaping circuit (6), the electrical physiotherapy device generates physiotherapy voltages with multiple waveforms.

2. The control circuit of the multi-mode electrical therapy apparatus according to claim 1, characterized in that: The low-voltage inverter circuit (3) comprises an NMOS transistor Q1, an NMOS transistor Q2, an NMOS transistor Q3, an NMOS transistor Q4 and a step-up transformer T1; the drain of the NMOS transistor Q1 is connected to the positive pole of the power supply and the drain of the NMOS transistor Q2, the source of the NMOS transistor Q2 is connected to the drain of the NMOS transistor Q4, the source of the NMOS transistor Q1 is connected to the drain of the NMOS transistor Q3, and the source of the NMOS transistor Q3 is connected to the source of the NMOS transistor Q4 and the negative pole of the power supply; one end of the input side of the step-up transformer T1 is connected to the source of the NMOS transistor Q1 and the drain of the NMOS transistor Q3, and the other end of the input side of the step-up transformer T1 is connected to the source of the NMOS transistor Q2 and the drain of the NMOS transistor Q4; the gate and drain of the NMOS transistor Q1, the gate and drain of the NMOS transistor Q2, the gate of the NMOS transistor Q3 and the gate of the NMOS transistor Q4 are connected to a voltage stabilization control circuit (2); and the output side of the step-up transformer T1 is connected to a step-up circuit (4).

3. The control circuit of the multi-mode electrical therapy apparatus according to claim 1, characterized in that: The boost circuit (4) comprises a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C 10 , capacitor C 11 , diode D1, diode D2, diode D3, diode D4, diode D5, diode D6, diode D7, diode D8, diode D9, diode D 10 and diode D 11 One end of the capacitor C1 is connected to an output terminal of the low voltage inverter circuit (3), and the other end of the capacitor C1 is connected in series with capacitors C3, C5, C7, C9 and C 11 The first charging circuit is formed, one end of the capacitor C2 is connected to the other end of the output end of the low voltage inverter circuit (3), and the other end of the capacitor C2 is connected in series with capacitors C4, C6, C8 and C 10 The second charging circuit is formed; the end of the first charging circuit is connected to a multi-way on-off inverter circuit (5); the diode D1, the diode D2, the diode D3, the diode D4, the diode D5, the diode D6, the diode D7, the diode D8, the diode D9, the diode D 10 and diode D 11 The circuit is connected between the first charging circuit and the second charging circuit in the form of a voltage doubling circuit.

4. The control circuit of the multi-mode electrical therapy apparatus according to claim 1, characterized in that: The multi-channel on-off inverter circuit (5) comprises a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R 10 , resistor R 11 , resistor R 12 , resistor R 13 , resistor R 14 , high-voltage optocoupler OP1, high-voltage optocoupler OP2, high-voltage optocoupler OP3, high-voltage optocoupler OP4, PIGBT tube Q5, NIGBT tube Q6, PIGBT tube Q7, NIGBT tube Q8 and step-up transformer T2; the emitter of the PIGBT tube Q5 is connected to the output end of the step-up circuit (4) and one end of the resistor R3, the collector of the PIGBT tube Q5 is connected to the collector of the NIGBT tube Q6 and one pole of the input side of the step-up transformer T2, the gate of the PIGBT tube Q5 is connected to the other end of the resistor R3 and the C pole of the high-voltage optocoupler OP1, the E pole of the high-voltage optocoupler OP1 is connected to the weak current circuit via the resistor R5, and the negative pole of the high-voltage optocoupler OP1 is grounded; The emitter is grounded, the gate of the NIGBT tube Q6 is connected to one end of the resistor R6, one end of the resistor R7 and the C pole of the high-voltage optocoupler OP2, the other end of the resistor R6 is connected to the output end of the boost circuit (4), the E pole of the high-voltage optocoupler OP2 is connected to the other end of the resistor R7 and grounded, and the positive pole of the high-voltage optocoupler OP2 is connected to the power supply voltage; the emitter of the PIGBT tube Q7 is connected to the output end of the boost circuit (4) and one end of the resistor R9, the collector of the PIGBT tube Q7 is connected to the collector of the NIGBT tube Q8 and the other pole of the input side of the boost transformer T2, the gate of the PIGBT tube Q7 is connected to the other end of the resistor R9 and the C pole of the high-voltage optocoupler OP3, and the E pole of the high-voltage optocoupler OP3 is connected to the power supply voltage via the resistor R 11 Connect the weak current circuit, the negative electrode of the high voltage optocoupler OP1 is grounded; the emitter of the NIGBT tube Q8 is grounded, and the gate of the NIGBT tube Q8 is connected to the resistor R 12 One end of the resistor R 13 One end of the resistor R 12 The other end is connected to the output end of the boost circuit (4), and the E pole of the high-voltage optical coupler OP4 is connected to the resistor R 13 The other end is connected to the ground, the positive electrode of the high-voltage optocoupler OP4 is connected to the power supply voltage; the positive electrode of the high-voltage optocoupler OP1 is connected to one end of the resistor R4, the negative electrode of the high-voltage optocoupler OP2 is connected to one end of the resistor R8, and the positive electrode of the high-voltage optocoupler OP3 is connected to the resistor R 10 The negative electrode of the high-voltage optocoupler OP4 is connected to the resistor R 14 one end of the resistor R4, the other end of the resistor R8, and the resistor R 10 The other end and resistor R 14 The other end is connected to the output end of the voltage stabilization control circuit (2); the output side of the step-up transformer T2 is connected to the high-voltage shaping circuit (6).

5. The control circuit of the multi-mode electrical therapy apparatus according to claim 1, characterized in that: The high voltage shaping circuit includes a resistor R 15 , capacitor C 12 and relay KA, the resistor R 15 One end of the resistor R is connected to the output terminal of the multi-channel on-off inverter circuit. 15 The other end is connected to one electrode of the electrode group and the capacitor C 12 One end of the capacitor C 12 The other end of the relay KA is connected to another pole piece of the pole piece group and another pole of the output end of the multi-channel on-off inverter circuit (5); the relay KA is connected to the resistor R 15 In parallel, the control end of the relay KA is connected to the output end of the voltage stabilizing control circuit (2).

6. The control circuit of the multi-mode electrical therapy apparatus according to claim 1, characterized in that: The voltage stabilization control circuit (2) comprises an MCU, a shunt resistor R sh , resistor R cf , resistor R1, resistor R2, capacitor C cf , capacitor C vf and a voltage stabilizing module (8), the power supply end of the MCU is connected to the power supply voltage via the voltage stabilizing module (8); the shunt resistor R sh Connect the power supply voltage, resistor R cf One end of the shunt resistor R sh One end of the resistor R cf The other end of the capacitor C cf One end and the sampling end AD1 of MCU, capacitor C cf The other end of the shunt resistor R sh One end of the resistor R1 is connected to the power supply voltage, the other end of the resistor R1 is connected to one end of the resistor R2, the capacitor C vf One end of the resistor R2 is connected to the sampling terminal AD2 of the MCU, and the other end of the resistor R2 is connected to the capacitor C vf The signal output end of the MCU is connected to a low-voltage inverter circuit (3), a multi-channel on-off inverter circuit (5) and a high-voltage shaping circuit (6).

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