CN107693942B - Medical low-frequency electric pulse therapeutic instrument - Google Patents

Abstract

The invention discloses a medical low-frequency electric pulse therapeutic apparatus, which comprises a power supply module, a high-voltage generating circuit for generating high voltage, a pulse output circuit for generating pulse waveforms and a system controller, wherein the power supply module is used for generating high voltage; the control signal output end of the system controller is respectively connected with the control signal input end of the high-voltage generating circuit and the control signal input end of the pulse output circuit; the high-voltage output end of the high-voltage generating circuit is connected with the high-voltage power supply end of the pulse output circuit; the power supply module supplies power to the high-voltage generating circuit, the pulse output circuit and the system controller respectively. The medical low-frequency electric pulse therapeutic apparatus adopts the system controller to control the voltage value of the high-voltage generating circuit and the pulse characteristic of the pulse output circuit, thereby meeting the use safety of users and the self-regulation of the pulse characteristic according to the self needs of the users and enhancing the use comfort.

Description

A medical low-frequency electric pulse therapeutic apparatus

technical field

The invention relates to a therapeutic instrument, especially a medical low-frequency electric pulse therapeutic instrument.

Background technique

At present, with the improvement of people's living standards, more and more people begin to pay attention to health. The medical low-frequency electric pulse therapy instrument can provide people with fast and effective home care, and is loved by more and more families. However, there are still many problems in the existing low-frequency electric pulse therapeutic apparatus, for example: (1) The battery voltage is directly used as the system power supply, and the battery directly supplies power to the system without voltage stabilization, resulting in high voltage instability. The loss of power gradually attenuates; (2) The linear modulation of the output voltage cannot be achieved. The existing technology mostly uses a transformer to boost the voltage. Since the boost ratio of the transformer is fixed, a point device is connected in series at the output terminal for output Intensity adjustment, digital control of the output intensity cannot be achieved, and the circuit cost is high, the volume is large, and the miniaturization and portability of the equipment cannot be realized. Even if the BOOST method is adopted, several fixed frequency or pulse width combinations are used as the BOOST The boost circuit is driven without current feedback, and the boost process is uncontrollable. It is reflected in the application that the amplitude modulation of the output waveform cannot be done. It does not meet the requirements of electrotherapy products to maintain stimulation by changing the waveform, and it cannot be suitable for different applications. The combination of treatment prescriptions for diseases has poor user experience; (3) During the output process, the output signal amplitude cannot be detected, which is impossible for some applications that require constant current output; (4) The application part is directly connected to the The human body has not been isolated. When the system is charging, if the charging part is damaged, such as the breakdown of the power adapter, there is a great potential safety hazard. Therefore, it is necessary to design a medical low-frequency electric pulse therapy instrument with high safety performance and self-adjustment according to user needs.

Contents of the invention

The purpose of the present invention is to provide a medical low-frequency electric pulse therapy instrument with high safety performance and self-adjustment according to user needs.

In order to achieve the purpose of the above invention, the invention discloses a medical low-frequency electric pulse therapy instrument, including a power supply module, a high-voltage generating circuit for generating high voltage, a pulse output circuit for generating pulse waveforms, and a system controller; the system The control signal output terminal of the controller is respectively connected with the control signal input terminal of the high-voltage generating circuit and the control signal input terminal of the pulse output circuit; the high-voltage output terminal of the high-voltage generating circuit is connected with the high-voltage power supply terminal of the pulse output circuit; Generating circuit, pulse output circuit and system controller supply power.

The system controller is connected to the high-voltage generating circuit and the pulse output circuit respectively, which can effectively control the voltage value of the high-voltage generating circuit and the pulse characteristics of the pulse output circuit, so as to meet the safety of users and adjust the pulse characteristics according to their own needs to enhance the use. comfort.

As a further limiting scheme created by the present invention, the pulse output circuit includes resistor R3, resistor R7, resistor R11, resistor R15, resistor R16, resistor R17, resistor R20, resistor R21, resistor R23, resistor R27, resistor R29, resistor R31, resistor R60, triode T1, triode T3, triode T5, triode T6, triode T8, triode T9, triode T11, diode D15, capacitor C24, double pole double throw relay REL1, output electrode OUT_N1 and output electrode OUT_P1; one end of the resistor R15 is used as a pulse The first control signal input end of the output circuit is connected to the first control signal output end of the system controller, and one end of the resistor R27 is used as the second control signal input end of the pulse output circuit to connect with the second control signal output end of the system controller. The output terminals are connected; the other end of the resistor R15 is connected to the base of the transistor T5 and one end of the resistor R17, the other end of the resistor R27 is connected to the base of the transistor T9 and one end of the resistor R31; the other end of the resistor R17 is connected to the emitter of the transistor T5 After grounding, the other end of the resistor R31 is connected to the emitter of the triode T9 and then grounded; the collector of the triode T5 is connected to one end of the resistor R7 and one end of the resistor R29, and the collector of the triode T9 is connected to one end of the resistor R23 and one end of the resistor R11; The other end of the resistor R7 is respectively connected to one end of the resistor R3 and the base of the transistor T1, and the other end of the resistor R23 is respectively connected to one end of the resistor R20 and the base of the transistor T8; the other end of the resistor R3 is connected to the emitter of the transistor T1 After that, it is connected with the first high-voltage power supply end of the pulse output circuit and the high-voltage output end of the high-voltage generating circuit, and the other end of the resistor R20 and the emitter of the transistor T8 are connected with the second high-voltage power supply end of the pulse output circuit. The high-voltage output terminal of the generating circuit is connected; the collector of the triode T1 is connected with the emitter of the triode T3 and a moving contact of the double-pole double-throw relay REL1, and the moving contact of the double-pole double-throw relay REL1 corresponds to the normally open The contact is connected to the output electrode OUT_N1; the collector of the triode T8 is connected to the emitter of the triode T11 and the other moving contact of the double-pole double-throw relay REL1, and the corresponding normal contact of this road of the double-pole double-throw relay REL1 The closed contact is connected to the output electrode OUT_P1; the other end of the resistor R11 is connected to the base of the transistor T3, and the other end of the resistor R29 is connected to the base of the transistor T11; the collector of the transistor T3 is respectively connected to one end of the capacitor C24 and one end of the resistor R60 One end is connected to the collector of the triode T11; the other end of the capacitor C24 is connected to the other end of the resistor R60 and then grounded; the positive pole of the coil of the double-pole double-throw relay REL1 is connected to the negative pole of the diode D15 and the 5V power supply of the power module; the positive pole of the diode D15 It is connected to the coil negative pole of the double-pole double-throw relay REL1 and the collector of the triode T6; the base of the triode T6 is connected to one end of the resistor R16 and one end of the resistor R21 respectively; the other end of the resistor R21 is connected to the emitter of the triode T6 and grounded ; The other end of the resistor R16 is connected to the third control signal output end of the system controller.

Use one end of the resistor R15 and one end of the resistor R27 as the first control signal input terminal LF_DRV_N of the pulse output circuit, and the second control signal input terminal LF_DRV_P to receive the PWM signal controlled by the single-chip microcomputer U4, which is the control signal output by applying the pulse waveform. When LF_DRV_N is at a high level, the triode T5, triode T1 and triode T11 are turned on, and the high-voltage signal passes through the output electrode OUT_N1 to the human body and then to the output electrode OUT_P1, forming a negative application pulse current; similarly, when LF_DRV_P is at a high level, the triode T9 , Transistor T3 and triode T8 are turned on, and the high-voltage signal passes through the output electrode OUT_P1 to the human body and then to the output electrode OUT_N1 to form a forward application pulse current. The single-chip microcomputer U4 can realize the unidirectional and bidirectional application current by controlling the LF_DRV_N and LF_DRV_P signals Output, pulse width and frequency control can produce changes and combine various output waveforms to enrich the user experience. The positive pole of the double-pole double-throw relay REL1 coil is VCC_5V, and the negative end is connected to the collector of the transistor T6. When the application stops, the transistor T6 is cut off, the coil of the double-pole double-throw relay REL1 is not conducting, and the output of the double-pole double-throw relay REL1 is cut off. , to protect the user, such as when the external USB charger fails and the system is damaged, the external power supply will not be applied to the human body through the electrodes to protect the user's safety. The resistor R60 is used to connect the collector of the triode T11 to the ground. During the pulse output process, the output pulse voltage is collected in real time through the sampling resistor R60. If the voltage is close to 0V, the output electrode on the surface does not form an effective circuit with the human body, and the output is stopped. It is used to prevent the discomfort caused by the direct application of too high pulse voltage to the human body and protect the safety of users; at the same time, the signal collected by the resistor R60 can reflect the current change of the output signal in real time, and the software can be combined with the boost control signal to achieve constant voltage. stream output.

As a further limiting scheme created by the present invention, the high-voltage generating circuit includes an operational amplifier U2, a capacitor C4, an inductor L1, a resistor R8, a capacitor C8, a triode T2, a diode D1, a capacitor C6, and a resistor R2; the inverting input terminal of the operational amplifier U2 is connected to the The 5V power supply of the power supply module is connected; the output terminal of the operational amplifier U2 is connected to the positive phase input terminal in feedback, and is connected to one end of the capacitor C4 and one end of the inductor L1 at the same time; the other end of the capacitor C4 is grounded; the other end of the inductor L1 is respectively connected to the diode D1 The anode of the transistor T2 is connected to the collector of the transistor T2; the base of the transistor T2 is connected to one end of the resistor R8 and one end of the capacitor C8 respectively; the emitter of the transistor T2 is grounded; the other end of the resistor R8 and the other end of the capacitor C8 are simultaneously connected to the system control The fourth control signal output terminal of the device is connected; the cathode of the diode D1 is respectively connected to one end of the capacitor C6 and one end of the resistor R2; the other end of the capacitor C6 is grounded; the other end of the resistor R2 is used as the high voltage output of the high voltage generating circuit.

Use the system power supply VCC_5V to form a voltage follower through the operational amplifier U2 to generate VBoost voltage, which is the input power of the high-voltage generator. Using the high input impedance of the operational amplifier, the system power supply and the high-voltage power supply are blocked to protect the weak current system. role. The PWM signal HV_DRV of the microcontroller U4 controls the on-off of the transistor T2 through a specific frequency, and VBoost stores energy in the magnetic field of the inductor L1 through the frequency and duty cycle control of the HV_DRV; when the transistor T2 is turned off, because the current of the inductor L1 cannot be mutated, the inductor L1 generates self-inductance electromotive force to prevent the decline of magnetic flux. The self-induction electromotive force of inductor L1 is negative on the left and positive on the right, just in the same direction as the power supply, and the voltage is superimposed to achieve the purpose of boosting and generate high voltage HV.

As a further limiting solution of the present invention, the system controller includes a single-chip microcomputer U4, a display screen and control buttons; the single-chip microcomputer U4 is provided with at least four control signal output terminals; the display screen and the control buttons are connected to the single-chip microcomputer U4. The display screen is used to display relevant parameters in real time, and the relevant parameters are set by the control buttons.

As a further limiting solution of the present invention, the power module includes a battery, a power switch circuit, a 5V power output circuit, and a charging management circuit; the power switch circuit is connected between the battery and the 5V power output circuit, and the battery outputs 5V power through the power switch circuit. The circuit provides power; the charging management circuit is connected with the battery and the system controller to control the charging of the battery.

The beneficial effect of the present invention is that: the system controller is connected with the high-voltage generating circuit and the pulse output circuit respectively, which can effectively control the voltage value of the high-voltage generating circuit and the pulse characteristics of the pulse output circuit, satisfying the user's use safety and the user's own It is necessary to adjust the pulse characteristics by itself to enhance the comfort of use.

Description of drawings

Fig. 1 is the overall circuit module schematic diagram that the present invention creates;

Fig. 2 is the schematic diagram of the power switch circuit created by the present invention;

Fig. 3 is the schematic diagram of the 5V power supply output circuit created by the present invention;

Fig. 4 is a schematic diagram of the charging management circuit created by the present invention;

Fig. 5 is the schematic diagram of the pulse output circuit created by the present invention;

Fig. 6 is the schematic diagram of the high voltage generating circuit created by the present invention;

Fig. 7 is a schematic diagram of pins of the single-chip microcomputer U4 created by the present invention.

Detailed ways

As shown in Figure 1, the medical low-frequency electric pulse therapeutic apparatus disclosed by the present invention includes: a power supply module, a high-voltage generating circuit for generating high voltage, a pulse output circuit for generating pulse waveforms, and a system controller; The control signal output terminal is respectively connected with the control signal input terminal of the high-voltage generating circuit and the control signal input terminal of the pulse output circuit; the high-voltage output terminal of the high-voltage generating circuit is connected with the high-voltage power supply terminal of the pulse output circuit; Pulse output circuit and system controller power supply.

As shown in Figure 2-4, the power module includes a battery, a power switch circuit, a 5V power output circuit, and a charging management circuit; the power switch circuit is connected between the battery and the 5V power output circuit, and the battery is a 5V power output circuit through the power switch circuit. Provide power; the charging management circuit is connected with the battery and the system controller to control the charging of the battery.

Wherein, the power switch circuit, the 5V power output circuit and the charging management circuit can all adopt conventional circuits in the field, such as the power switch circuit shown in Figure 2, the terminal J1 is connected to a 3.7V lithium battery, and the field effect transistor Q1, Diode D2 and diode D3 form a power switch, and resistor R1 is connected to the gate of field effect transistor Q1. When the power button K1 is pressed, the source and drain of field effect transistor Q1 are turned on, and V_IN is powered on. The collector of the transistor T4 is connected to the gate of the field effect transistor Q1. After the system is powered on, the microcontroller U4 sets the base level of the transistor T4 to a high level, and the gate of the field effect transistor Q1 is pulled down to keep V_IN turned on. The collector of the transistor T10 is connected to the gate of the field effect transistor Q2. After the system is powered on, the microcontroller U4 sets the base level of the transistor T10 to a high level, the gate of the field effect transistor Q2 is pulled down, the battery voltage signal BATT+ is turned on, and AD_BATVOL is detected. Signal strength to judge the current battery level.

The 5V power supply output circuit shown in Figure 3 provides power for the system after V_IN is powered on. At this time, the chip U1 works, boosting the battery voltage 3.7V to a stable VCC_5V for use by various subsystems. When the system is charging, the charging voltage V_IN_5V signal is at a high level and is connected to the base of the transistor T7 through the resistor R19. At this time, the chip U1 stops working to protect the system power supply.

In the charging management circuit shown in Figure 4, the Zener diode Z2 and R59 are connected in series to form a voltage clamping circuit. When the charging power supply USB_5V_IN is connected, if overvoltage occurs, the Zener diode Z2 breaks down and the transistor T15 is turned on; the transistor T15 The collector of the transistor T14 is pulled low and connected to the base of the transistor T14 through the resistor R57, and the collector of the transistor T14 is connected to the resistor R55 and the gate of the field effect transistor Q4. At this time, the transistor T14 is cut off, and the gate of the field effect transistor Q4 is pulled high. Then the field effect transistor Q4 is not turned on, and VIN_5V is not powered on, which plays a role in protecting the back-end circuit. When normal USB power is input, chip U3 works to charge the battery.

As shown in Figure 5, the pulse output circuit includes resistor R3, resistor R7, resistor R11, resistor R15, resistor R16, resistor R17, resistor R20, resistor R21, resistor R23, resistor R27, resistor R29, resistor R31, resistor R60, triode T1, triode T3, triode T5, triode T6, triode T8, triode T9, triode T11, diode D15, capacitor C24, double pole double throw relay REL1, output electrode OUT_N1 and output electrode OUT_P1; one end of the resistor R15 is used as the pulse output circuit The first control signal input terminal is connected to the first control signal output terminal of the system controller, and one end of the resistor R27 is connected to the second control signal output terminal of the system controller as the second control signal input terminal of the pulse output circuit The other end of the resistor R15 is connected to the base of the transistor T5 and one end of the resistor R17, the other end of the resistor R27 is connected to the base of the transistor T9 and one end of the resistor R31; the other end of the resistor R17 is connected to the emitter of the transistor T5 and grounded, The other end of the resistor R31 is connected to the emitter of the triode T9 and grounded; the collector of the triode T5 is connected to one end of the resistor R7 and one end of the resistor R29, and the collector of the triode T9 is connected to one end of the resistor R23 and one end of the resistor R11; The other end is respectively connected with one end of the resistor R3 and the base of the transistor T1, and the other end of the resistor R23 is respectively connected with one end of the resistor R20 and the base of the transistor T8; The first high-voltage power supply end of the pulse output circuit is connected to the high-voltage output end of the high-voltage generating circuit, and the other end of the resistor R20 and the emitter of the transistor T8 are connected to the second high-voltage power supply end of the pulse output circuit and the high-voltage generating circuit. The high-voltage output terminal is connected; the collector of the triode T1 is connected to the emitter of the triode T3 and a moving contact of the double-pole double-throw relay REL1, and the corresponding normally open contact of the moving contact of the double-pole double-throw relay REL1 is connected to the The output electrode OUT_N1 is connected; the collector of the transistor T8 is connected with the emitter of the transistor T11 and the other moving contact of the double-pole double-throw relay REL1, and the corresponding normally closed contact of the moving contact of the double-pole double-throw relay REL1 It is connected to the output electrode OUT_P1; the other end of the resistor R11 is connected to the base of the transistor T3, and the other end of the resistor R29 is connected to the base of the transistor T11; the collector of the transistor T3 is respectively connected to one end of the capacitor C24, one end of the resistor R60 and the transistor The collector of T11 is connected; the other end of the capacitor C24 and the other end of the resistor R60 are connected and then grounded; the positive pole of the coil of the double pole double throw relay REL1 is connected with the negative pole of the diode D15 and the 5V power supply of the power module; the positive pole of the diode D15 is connected with the double pole The negative coil of the double-throw relay REL1 is connected to the collector of the transistor T6; the base of the transistor T6 is connected to one end of the resistor R16 and one end of the resistor R21 respectively; the other end of the resistor R21 is connected to the emitter of the transistor T6 and grounded; the resistor R16 The other end is connected to the third control signal output end of the system controller.

One end of the resistor R15 and one end of the resistor R27 are used as the first control signal input terminal LF_DRV_N of the pulse output circuit, and the second control signal input terminal LF_DRV_P receives the PWM signal controlled by the single-chip microcomputer U4, which is the control signal output by applying the pulse waveform. When LF_DRV_N When the level is high, the transistor T5, the transistor T1 and the transistor T11 are turned on, and the high-voltage signal passes through the output electrode OUT_N1 to the human body and then to the output electrode OUT_P1, forming a negative application pulse current; similarly, when LF_DRV_P is high, the transistors T9, Transistor T3 and triode T8 are turned on, and the high-voltage signal passes through the output electrode OUT_P1 to the human body and then to the output electrode OUT_N1 to form a forward application pulse current. The single-chip microcomputer U4 can realize the one-way and two-way output of the application current by controlling the LF_DRV_N and LF_DRV_P signals , pulse width and frequency control, produce changes, combine various output waveforms, and enrich the user experience. The positive pole of the double-pole double-throw relay REL1 coil is VCC_5V, and the negative end is connected to the collector of the transistor T6. When the application stops, the transistor T6 is cut off, the coil of the double-pole double-throw relay REL1 is not conducting, and the output of the double-pole double-throw relay REL1 is cut off. , to protect the user, such as when the external USB charger fails and the system is damaged, the external power supply will not be applied to the human body through the electrodes to protect the user's safety. The resistor R60 is used to connect the collector of the triode T11 to the ground. During the pulse output process, the output pulse voltage is collected in real time through the sampling resistor R60. If the voltage is close to 0V, the output electrode on the surface does not form an effective circuit with the human body, and the output is stopped. It is used to prevent the discomfort caused by the direct application of too high pulse voltage to the human body and protect the safety of users; at the same time, the signal collected by the resistor R60 can reflect the current change of the output signal in real time, and the software can be combined with the boost control signal to achieve constant voltage. stream output.

As shown in Figure 6, the high-voltage generating circuit includes operational amplifier U2, capacitor C4, inductor L1, resistor R8, capacitor C8, transistor T2, diode D1, capacitor C6, and resistor R2; the inverting input terminal of operational amplifier U2 and the power module Connected to 5V power supply; the output terminal of operational amplifier U2 is connected to the positive phase input terminal in feedback, and connected to one end of capacitor C4 and one end of inductor L1 at the same time; the other end of capacitor C4 is grounded; the other end of inductor L1 is respectively connected to the positive pole of diode D1 and The collector of the transistor T2 is connected; the base of the transistor T2 is connected to one end of the resistor R8 and one end of the capacitor C8 respectively; the emitter of the transistor T2 is grounded; the other end of the resistor R8 and the other end of the capacitor C8 are simultaneously connected to the first end of the system controller The four control signal output terminals are connected; the cathode of the diode D1 is respectively connected to one end of the capacitor C6 and one end of the resistor R2; the other end of the capacitor C6 is grounded; the other end of the resistor R2 is used as the high voltage output end of the high voltage generating circuit.

Among them, the system power supply VCC_5V is used to generate the VBoost voltage through the voltage follower formed by the op amp U2, which is the input power of the high voltage generator, and the high input impedance of the op amp is used to block the system power supply and the high voltage power supply to protect The role of weak current system. The PWM signal HV_DRV of the microcontroller U4 controls the on-off of the transistor T2 through a specific frequency, and VBoost stores energy in the magnetic field of the inductor L1 through the frequency and duty cycle control of the HV_DRV; when the transistor T2 is turned off, because the current of the inductor L1 cannot be mutated, the inductor L1 generates self-inductance electromotive force to prevent the decline of magnetic flux. The self-induction electromotive force of inductor L1 is negative on the left and positive on the right, just in the same direction as the power supply, and the voltage is superimposed to achieve the purpose of boosting and generate high voltage HV.

As shown in Figure 7, it is the minimum system of single-chip microcomputer U4 in the system controller. The system controller includes single-chip microcomputer U4, display screen and control buttons; single-chip microcomputer U4 is provided with at least four road control signal output ends; U4 is connected; the display screen and control buttons can be directly replaced by the touch screen. Chip U6 is a standard reference voltage chip, and pin 2 of chip U6 is connected to pin 19 of microcontroller U4 to provide an external reference voltage for the system. When the battery power loss is large, it will cause the system voltage VCC_5V to fluctuate downward. Using a standard voltage source can avoid directly using the system voltage as the reference voltage of the single-chip microcomputer to ensure the reliability of battery power measurement.

Claims (3)

1. A medical low-frequency electric pulse therapy instrument, characterized in that: comprise a power supply module, a high-voltage generating circuit for generating high voltage, a pulse output circuit and a system controller for generating pulse waveforms; the control signal output of the system controller The terminals are respectively connected to the control signal input terminal of the high-voltage generating circuit and the control signal input terminal of the pulse output circuit; the high-voltage output terminal of the high-voltage generating circuit is connected to the high-voltage power supply terminal of the pulse output circuit; and system controller power supply; Pulse output circuit includes resistor R3, resistor R7, resistor R11, resistor R15, resistor R16, resistor R17, resistor R20, resistor R21, resistor R23, resistor R27, resistor R29, resistor R31, resistor R60, triode T1, triode T3, triode T5, transistor T6, transistor T8, transistor T9, transistor T11, diode D15, capacitor C24, double pole double throw relay REL1, output electrode OUT_N1 and output electrode OUT_P1; one end of resistor R15 is used as the first control signal input of the pulse output circuit The terminal is connected to the first control signal output terminal of the system controller, and one end of the resistor R27 is connected to the second control signal output terminal of the system controller as the second control signal input terminal of the pulse output circuit; the other end of the resistor R15 Connect the base of the transistor T5 and one end of the resistor R17, the other end of the resistor R27 is connected to the base of the transistor T9 and one end of the resistor R31; the other end of the resistor R17 and the emitter of the transistor T5 are connected to ground, and the other end of the resistor R31 and The emitter of the transistor T9 is connected to the ground; the collector of the transistor T5 is connected to one end of the resistor R7 and one end of the resistor R29, and the collector of the transistor T9 is connected to one end of the resistor R23 and one end of the resistor R11; the other end of the resistor R7 is respectively connected to the resistor R3 One end of the resistor R23 is connected to the base of the transistor T1, and the other end of the resistor R23 is connected to one end of the resistor R20 and the base of the transistor T8; The first high-voltage power supply end is connected to the high-voltage output end of the high-voltage generating circuit, and the other end of the resistor R20 is connected to the emitter of the triode T8, and then connected to the second high-voltage power supply end of the pulse output circuit and the high-voltage output end of the high-voltage generating circuit; the triode The collector of T1 is connected to the emitter of the triode T3 and a moving contact of the double-pole double-throw relay REL1, and the normally open contact corresponding to the moving contact of the double-pole double-throw relay REL1 is connected to the output electrode OUT_N1; the triode The collector of T8 is connected to the emitter of the transistor T11 and the other moving contact of the double-pole double-throw relay REL1, and the normally closed contact corresponding to the moving contact of the double-pole double-throw relay REL1 is connected to the output electrode OUT_P1; The other end of the resistor R11 is connected to the base of the transistor T3, and the other end of the resistor R29 is connected to the base of the transistor T11; the collector of the transistor T3 is respectively connected to one end of the capacitor C24, one end of the resistor R60 and the collector of the transistor T11; The other end of the capacitor C24 and the other end of the resistor R60 are connected to ground; the positive pole of the coil of the double-pole double-throw relay REL1 is connected to the negative pole of the diode D15 and the 5V power supply of the power module; the positive pole of the diode D15 is connected to the coil of the double-pole double-throw relay REL1 The negative pole is connected to the collector of the transistor T6; the base of the transistor T6 is connected to one end of the resistor R16 and one end of the resistor R21 respectively; the other end of the resistor R21 is connected to the emitter of the transistor T6 and grounded; the other end of the resistor R16 is connected to the system The third control signal output terminal of the controller is connected; The high-voltage generating circuit includes operational amplifier U2, capacitor C4, inductor L1, resistor R8, capacitor C8, transistor T2, diode D1, capacitor C6 and resistor R2; the inverting input terminal of operational amplifier U2 is connected to the 5V power supply of the power module; The output terminal of U2 is connected to the non-inverting input terminal in feedback, and is connected to one end of the capacitor C4 and one end of the inductor L1 at the same time; the other end of the capacitor C4 is grounded; the other end of the inductor L1 is respectively connected to the positive pole of the diode D1 and the collector of the transistor T2 The base of the transistor T2 is connected to one end of the resistor R8 and one end of the capacitor C8 respectively; the emitter of the transistor T2 is grounded; the other end of the resistor R8 and the other end of the capacitor C8 are simultaneously connected to the fourth control signal output end of the system controller connected; the cathode of the diode D1 is respectively connected to one end of the capacitor C6 and one end of the resistor R2; the other end of the capacitor C6 is grounded; the other end of the resistor R2 is used as the high voltage output end of the high voltage generating circuit. 2. The medical low-frequency electric pulse therapeutic instrument according to claim 1, characterized in that: the system controller comprises a single-chip microcomputer U4, a display screen and control buttons; the single-chip microcomputer U4 is provided with at least four control signal output terminals; the display screen and the control buttons Both are connected with the single-chip microcomputer U4. 3. The medical low-frequency electric pulse therapeutic apparatus according to claim 1, characterized in that: the power module includes a battery, a power switch circuit, a 5V power output circuit and a charging management circuit; the power switch circuit is connected between the battery and the 5V power output circuit During the period, the battery provides power for the 5V power output circuit through the power switch circuit; the charging management circuit is connected with the battery and the system controller to control battery charging.

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