阅读说明：本技术 变频电疗装置及电疗仪 (Variable-frequency electrotherapy device and electrotherapy instrument ) 是由 方红卫 皮领先 于 2020-05-15 设计创作，主要内容包括：本发明公开了变频电疗装置,包括信号发送模块、控制模块和输出模块,信号发送模块用于生成控制信号,控制模块与信号发送模块电连接,控制模块包括MCU系统和电感选择电路,MCU系统与电感选择电路电连接,电感选择电路与输出模块电连接,MCU系统根据控制信号产生对应的电感控制指令,电感选择模块根据电感控制指令切换电感以生成相应的输出信号。本发明通过接收的控制信号使电感选择电路进行电感切换,实现输出信号的改变,进而实现输出模块输出波形幅度和/或宽度的变化,在一定程度上提高了变频效果和理疗效果。(The invention discloses a variable-frequency electrotherapy device which comprises a signal transmitting module, a control module and an output module, wherein the signal transmitting module is used for generating a control signal, the control module is electrically connected with the signal transmitting module, the control module comprises an MCU system and an inductance selection circuit, the MCU system is electrically connected with the inductance selection circuit, the inductance selection circuit is electrically connected with the output module, the MCU system generates a corresponding inductance control instruction according to the control signal, and the inductance selection module switches an inductance according to the inductance control instruction to generate a corresponding output signal. The invention switches the inductance of the inductance selection circuit through the received control signal, realizes the change of the output signal, further realizes the change of the amplitude and/or the width of the output waveform of the output module, and improves the frequency conversion effect and the physical therapy effect to a certain extent.)

1. Variable frequency electrotherapy device characterized in that it comprises:

the signal sending module is used for generating a control signal;

the control module is electrically connected with the signal sending module and used for receiving the control signal and outputting a corresponding output signal according to the control signal;

wherein the control module comprises:

the MCU system is used for receiving the control signal and generating an inductance control instruction according to the control signal;

one end of the inductance selection circuit is electrically connected with the MCU system, and the inductance selection circuit switches the inductance according to the inductance control instruction to generate the output signal;

and the output module is electrically connected with the other end of the inductance selection circuit.

2. The variable frequency electrotherapy device of claim 1, wherein said control module further comprises: the electrode impedance detection circuit is used for detecting the electric signal of the output module;

one end of the electrode impedance detection circuit is electrically connected with the output module, and the other end of the electrode impedance detection circuit is electrically connected with the MCU system.

3. The variable frequency electrotherapy device of claim 2, wherein said inductance selection circuit comprises: a plurality of inductors and a plurality of first relays;

a plurality of the inductors are connected in series;

one ends of the first relays are respectively connected with a power supply, and the other ends of the first relays are respectively electrically connected with the MCU system;

the inductance selection circuit controls the contact connection states of the first relays according to the inductance control instruction;

wherein the contact of at least one of the first relays is electrically connected to a series connection point of the inductors.

4. The variable frequency electrotherapy device according to claim 2, wherein said electrode impedance detection circuitry comprises: a first operational amplifier and a second operational amplifier;

the output end of the first operational amplifier is electrically connected with the input end of the second operational amplifier, and the input end of the first operational amplifier is electrically connected with the output module.

5. The variable frequency electrotherapy device according to any one of claims 2-4, wherein said control module further comprises a power amplification circuit, one end of said power amplification circuit being electrically connected to said MCU system, the other end of said power amplification circuit being electrically connected to said inductance selection circuit;

the power amplification circuit comprises a push-pull circuit and a switch circuit, one end of the switch circuit is electrically connected with the MCU system, the other end of the switch circuit is electrically connected with the push-pull circuit, one end of the push-pull circuit is electrically connected with a drive circuit, and one end of the drive circuit is connected with the series connection point of the inductor selection circuit.

6. The variable frequency electrotherapy device according to claim 5, wherein said signal transmission module comprises:

the LCD touch screen is used for receiving a control signal of the variable-frequency electrotherapy device;

and one end of the upper computer system is electrically connected with the LCD touch screen, the other end of the upper computer system is electrically connected with the MCU system, and the upper computer system receives the control signal and sends the control signal to the MCU system.

7. The variable frequency electrotherapy device of claim 6, wherein said output module comprises: an output electrode circuit;

the output electrode circuit comprises a plurality of second relays, one ends of the second relays are respectively connected with a power supply, and the other ends of the second relays are respectively electrically connected with the MCU system;

wherein the switch end of at least one of the second relays is electrically connected with the input end of the electrode impedance detection circuit.

8. The variable frequency electrotherapy device according to claim 7, wherein said control signals include at least one of: frequency signals, intensity signals, waveform signals and start and stop signals;

and the MCU system adjusts the pulse width and/or the pulse frequency according to the control signal.

9. The variable frequency electrotherapy device of claim 8, further comprising: a DC-DC power supply circuit and an AC-DC power supply circuit;

the AC-DC power supply circuit is electrically connected with commercial power, the DC-DC power supply circuit is electrically connected with the AC-DC power supply circuit, and the DC-DC power supply circuit provides the power for the variable-frequency electrotherapy device.

10. A variable frequency electrotherapy instrument comprising the variable frequency electrotherapy device of any one of claims 1-9 and an output assembly electrically connected to said output module;

the output assembly comprises a temperature detection circuit, and the temperature detection circuit is electrically connected with the MCU system.

Technical Field

The invention relates to the field of medical instruments, in particular to a variable-frequency electrotherapy device and an electrotherapy instrument.

Background

At present, there are three electrotherapy apparatuses with different output frequencies, such as low frequency, intermediate frequency, and high frequency, and the intensity of the output signal is changed by adjusting the waveform, amplitude, and frequency of the output signal of the electrotherapy apparatus, and the output signal is acted on the skin of a human body to realize electrotherapy.

In the related art, the electro-therapeutic apparatus uses a pulse transformer as an output device, the frequency conversion effect of the pulse transformer is poor, the effect of the output signal on the human body is not obvious, the pulse width of the output signal is large and generally above 400us, and the larger the pulse width of the output signal is, the smaller the stimulation to the human body is, and the worse the physiotherapy effect is.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a variable frequency electrotherapy device which can adjust the amplitude and/or width of an output waveform and improve the frequency conversion effect.

The invention also provides a variable-frequency electrotherapy instrument with the variable-frequency electrotherapy device.

According to an embodiment of the first aspect of the present invention, a variable frequency electrotherapy apparatus comprises:

the signal sending module is used for generating a control signal;

the control module is electrically connected with the signal sending module and used for receiving the control signal and outputting a corresponding output signal according to the control signal;

wherein the control module comprises:

the MCU system is used for receiving the control signal and generating an inductance control instruction according to the control signal;

one end of the inductance selection circuit is electrically connected with the MCU system, and the inductance selection circuit switches the inductance according to the inductance control instruction to generate the output signal;

and the output module is electrically connected with the other end of the inductance selection circuit.

The frequency conversion electrotherapy device of the embodiment of the invention at least has the following beneficial effects: the control module changes the output signal output to the output module by receiving the control signal of the signal sending module, thereby realizing the output control of the variable-frequency electrotherapy device. The control module comprises an MCU system and an inductance selection circuit, the MCU system changes an inductance control instruction input to the inductance selection circuit through a received control signal, the inductance selection circuit is controlled to conduct inductance switching, output signal changing is achieved, and then output module output waveform amplitude and/or width changing is achieved, so that narrow pulse output of the variable-frequency electrotherapy device is achieved, and physiotherapy effect is improved.

According to some embodiments of the invention, the control module further comprises an electrode impedance detection circuit for detecting the electrical signal of the output module;

one end of the electrode impedance detection circuit is electrically connected with the output module, and the other end of the electrode impedance detection circuit is electrically connected with the MCU system.

According to some embodiments of the invention, the inductance selection circuit comprises: a plurality of inductors and a plurality of first relays;

a plurality of the inductors are connected in series;

one ends of the first relays are respectively connected with a power supply, and the other ends of the first relays are respectively electrically connected with the MCU system;

the inductance selection circuit controls the contact connection states of the first relays according to the inductance control instruction;

wherein the contact of at least one of the first relays is electrically connected to a series connection point of the inductors.

According to some embodiments of the invention, the electrode impedance detection circuit comprises: a first operational amplifier and a second operational amplifier;

the output end of the first operational amplifier is electrically connected with the input end of the second operational amplifier, and the input end of the first operational amplifier is electrically connected with the output module.

According to some embodiments of the invention, the control module further comprises: a power amplification circuit;

one end of the power amplifying circuit is electrically connected with the MCU system, and the other end of the power amplifying circuit is electrically connected with the inductance selection circuit;

the power amplification circuit comprises a push-pull circuit and a switch circuit, one end of the switch circuit is electrically connected with the MCU system, the other end of the switch circuit is electrically connected with the push-pull circuit, one end of the push-pull circuit is electrically connected with a drive circuit, and one end of the drive circuit is connected with the series connection point of the inductor selection circuit.

According to some embodiments of the invention, the signal transmission module comprises:

the LCD touch screen is used for receiving a control signal of the variable-frequency electrotherapy device;

and one end of the upper computer system is electrically connected with the LCD touch screen, the other end of the upper computer system is electrically connected with the MCU system, and the upper computer system receives the control signal and sends the control signal to the MCU system.

According to some embodiments of the invention, the output module comprises: an output electrode circuit;

the output electrode circuit comprises a plurality of second relays, one ends of the second relays are respectively connected with a power supply, and the other ends of the second relays are respectively electrically connected with the MCU system;

wherein the switch end of at least one of the second relays is electrically connected with the input end of the electrode impedance detection circuit.

According to some embodiments of the invention, the control signal comprises at least one of: frequency signals, intensity signals, waveform signals and start and stop signals;

and the MCU system adjusts the pulse width and/or the pulse frequency according to the control signal.

According to some embodiments of the invention, the variable frequency electrotherapy device further comprises: a DC-DC power supply circuit and an AC-DC power supply circuit;

the AC-DC power supply circuit is electrically connected with commercial power, the DC-DC power supply circuit is electrically connected with the AC-DC power supply circuit, and the DC-DC power supply circuit provides the power for the variable-frequency electrotherapy device.

The variable-frequency electrotherapy instrument according to the second aspect of the invention comprises the variable-frequency electrotherapy device according to the first aspect of the invention and an output assembly, wherein the output assembly is electrically connected with the output module;

the output assembly comprises a temperature detection circuit, and the temperature detection circuit is electrically connected with the MCU system.

The variable-frequency electro-therapeutic apparatus provided by the embodiment of the invention at least has the following beneficial effects: through output assembly and output module electricity connection, output assembly acts on human skin, makes output assembly's functional effect and the wave form of the different frequencies of output module output combine together, has strengthened the physiotherapy effect, has improved user experience to a certain extent.

Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

FIG. 1 is a block diagram of an embodiment of a variable frequency electrotherapy device in accordance with embodiments of the present invention;

FIG. 2 is a specific circuit diagram of an inductor selection circuit according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of an embodiment of an electrode impedance detection circuit;

FIG. 4 is a schematic diagram of an embodiment of a power amplifier circuit;

FIG. 5 is a specific circuit diagram of the output circuit according to the embodiment of the present invention;

fig. 6 is a block diagram of a frequency conversion electro-therapeutic apparatus according to an embodiment of the present invention.

Detailed Description

The concept and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments to fully understand the objects, features and effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention.

In the description of the embodiments of the present invention, if "a plurality" is referred to, it is to be understood that more than one is included. If reference is made to "first" or "second", this should be understood to distinguish between features and not to indicate or imply relative importance or to implicitly indicate the number of indicated features or to implicitly indicate the precedence of the indicated features.

Referring to fig. 1, in some embodiments, a variable frequency electrotherapy device includes: the signal sending module is used for generating a control signal; the control module is electrically connected with the signal sending module and used for receiving the control signal and outputting a corresponding output signal according to the control signal; wherein, the control module includes: an MCU (micro controller Unit) system for receiving the control signal and generating an inductance control instruction according to the control signal; one end of the inductance selection circuit is electrically connected with the MCU system, and the inductance selection circuit switches the inductance according to the inductance control instruction to generate a corresponding output signal; and the output module is electrically connected with the other end of the inductance selection circuit.

The signal transmitting module receives the operation of a user on the variable-frequency electrotherapy device, generates a control signal and transmits the control signal to the MCU system, and the MCU system receives the control signal and generates a corresponding inductance control instruction, and controls the inductance selection circuit to switch inductances according to the inductance control instruction. The output module is electrically connected with the inductance selection circuit, and the inductance selection circuit switches different inductances, namely, the inductance connected with the output module changes, so that the output module outputs waveforms with different amplitudes and/or widths, thereby changing the current intensity of the variable-frequency electrotherapy device acting on a human body, adjusting the feeling of the human body on the output current and improving the electrotherapy effect. It can be understood that the MCU system is a main controller of the control module, and is configured to receive an external control signal from the control module and convert the control signal into a control command, such as an inductance control command, inside the control module. In some specific examples, the MCU system is a processor with data processing capability, such as a single chip microcomputer. The inductance selection circuit receives the inductance control command to perform inductance switching, specifically, the inductance selection circuit may be switched to an inductance with a different inductance value, or may be switched to a combination of different inductances, which is not specifically limited in the embodiment of the present invention.

In some embodiments, referring to fig. 1, the control module further includes an electrode impedance detection circuit, one end of the electrode impedance detection circuit is electrically connected to the output module, and the other end of the electrode impedance detection circuit is electrically connected to the MCU system, and the electrode impedance detection circuit is configured to detect an electrical signal, such as a current signal, a voltage signal, and the like, of the output module. The output module acts on a human body, different human body resistances exist in different human bodies, when the output module is in contact with the human body, the resistance is connected into a circuit corresponding to the output module equivalently, a signal loop is formed, and when the human body resistances are different, the detected electric signals of the output module can be distinguished. Electrode impedance detection circuitry is connected with the output module electricity, detects the signal of telecommunication through human resistance to with this signal of telecommunication input to MCU system, MCU system judges whether the size of signal of telecommunication accords with and predetermines the threshold value scope, when being less than or being higher than predetermineeing the threshold value scope, the MCU system will report to the police and indicate, for example: sound alarm and/or display alarm, etc., and controls the output module to act on the human body signals, such as: and the output module is switched off to act on the signal of the human body or adjust the signal intensity. In some specific embodiments, the output module is used for outputting the current signals from the two electrodes when acting on the human body, when the two electrodes are connected due to misoperation, the current signals detected by the electrode impedance detection circuit are increased, and the MCU system turns off the output module, so as to protect the human body and prevent the variable-frequency electrotherapy device from being damaged.

Specifically, the electric signal of the output module detected by the electrode impedance detection circuit is acquired by the MCU system and subjected to A/D conversion to obtain a corresponding impedance value, and when the impedance value is lower than a preset impedance threshold value, the MCU system can make a sound and/or display an alarm and cut off the output current of the output module. It is understood that the preset threshold value can be adjusted and set according to actual conditions.

In some embodiments, referring to fig. 1, the control module further includes a power amplification circuit, one end of the power amplification circuit is electrically connected to the MCU system, and the other end of the power amplification circuit is electrically connected to the inductance selection circuit.

In some embodiments, referring to fig. 1, the signal transmission module includes an LCD touch screen and an upper computer system, the LCD touch screen is used for receiving a control signal of the variable-frequency electrotherapy device, one end of the upper computer system is electrically connected to the LCD touch screen, and the other end of the upper computer system is electrically connected to the MCU system. Corresponding to the upper computer system, the MCU system is a lower computer system, the LCD touch screen receives a control signal of a user to the variable-frequency electrotherapy device, and the control signal comprises at least one of the following: the frequency signal, the intensity signal, the waveform signal, the start signal, the stop signal and the like can correspondingly adjust and set the control signal according to the requirements of a user or scenes and the like. The upper computer system receives the control signal and outputs to the MCU system, and the MCU system converts the control signal into a corresponding control instruction, for example: inductance control instructions and the like, and control operation of the control module by the control signals is realized. It is understood that the LCD touch screen can be replaced by an OLED touch screen, a key controller, or other devices capable of receiving control signals. Specifically, the MCU system adjusts the Pulse width and/or the Pulse Frequency according to the control signal, i.e. adjusts the PWM (Pulse width Modulation) and/or the PFM (Pulse Frequency Modulation) according to the control signal, and adjusts the amplitude, the Frequency, etc. of the output Pulse of the MCU system, so as to change the intensity of the output signal and improve the physical therapy effect.

In some embodiments, referring to fig. 1, the frequency-variable electrotherapy apparatus further includes an AC-DC (Alternating Current-Direct Current) power supply circuit connected to a commercial power and a DC-DC (Direct Current-Direct Current) power supply circuit electrically connected to the AC-DC power supply circuit. The AC-DC power supply circuit converts 220V alternating current into direct current, and the DC-DC power supply circuit performs voltage reduction treatment on the converted direct current to provide power for the variable-frequency electrotherapy device. In a specific embodiment, the DC-DC power circuit can step down the converted direct current to a direct current voltage of 1.2V, 5V, 12V, etc., and is electrically connected with the MCU system.

In some embodiments, referring to fig. 2, the inductance selection circuit comprises: a plurality of inductors and a plurality of first relays; the inductors are connected in series; one end of each of the first relays is connected with the power supply, and the other end of each of the first relays is electrically connected with the MCU system. The number of the inductors and the number of the first relays can be adjusted and set according to actual conditions, specifically, the inductor selection circuit comprises a first relay U7, a first relay U8 and a first relay U9, and 5 inductors L1, an inductor L2, an inductor L3, an inductor L4 and an inductor L5, one end of each of the first relay U7, the first relay U8 and the first relay U9 is connected with a 5V power supply provided by the DC-DC power supply circuit, the other end SELECT1 of the first relay U7, the other end SELECT2 of the first relay U8 and the other end SELECT sellect 3 of the first relay U9 are electrically connected with the MCU system respectively, the MCU system controls the working states of the first relay U2, the first relay U2 and the first relay U2 through the port SELECT1, the port SELECT2 and the port SELECT2, and sends control commands to the inductor ports 2 and 2 through triggering the chip, and the MCU system receives control signals and sends control commands to the inductor ports 2 and the inductive ports 2, When the port SELECT2 and the port SELECT3 are connected with a low level, a potential difference is generated between the ports and a 5V power supply, and the first relay U7, the first relay U8 and the first relay U9 are in working states; when the port SELECT1, the port SELECT2, and the port SELECT3 are high, the first relay U7, the first relay U8, and the first relay U9 are off.

An inductor L1, an inductor L2, an inductor L3, an inductor L4 and an inductor L5 are connected in series, one end of an inductor L1 is connected with a 1.2V power supply provided by a DC-DC power supply circuit, contacts of a first relay U7 and a first relay U9 are respectively and electrically connected with a series connection point of the inductor L1, the inductor L2, the inductor L3, the inductor L4 and the inductor L5, the contacts comprise normally open contacts and normally closed contacts, specifically, the normally closed contact T1-3 of the first relay U7 is electrically connected with a series node of the inductor L2 and the inductor L3, and the normally open contact T1-2 of the first relay U7 is electrically connected with a series node of the inductor L1 and the inductor L2; the normally closed contact T1-6 of the first relay U9 is electrically connected with one end of the inductor L5, and the normally open contact T1-4 of the first relay U9 is electrically connected with the series node of the inductor L3 and the inductor L4.

The MCU system receives the control signals and generates corresponding inductance control instructions, and the inductance selection circuit controls the connection states of the first relay contacts according to the inductance control instructions. Specifically, when the first relay U7, the first relay U8 and the first relay U9 work, the switch ends are connected with the normally open contacts, when the first relay U7, the first relay U8 and the first relay U9 are turned off, the switch ends are connected with the normally closed contacts, and when the switch ends are connected with the normally open contacts or the normally closed contacts, the connection states of the inductor L1, the inductor L2, the inductor L3, the inductor L4 and the inductor L5 with the first relay are changed, that is, the inductor is switched. In one specific embodiment, the contacts of the first relay U8 are connected with the switch ends of the first relay U7 and the first relay U9 to control the contact connection state of the first relay U7 and the first relay U9. A normally closed contact U8-4 of the first relay U8 is connected with a switch end of the first relay U9, and a normally open contact U8-5 of the first relay U8 is connected with a switch end of the first relay U7; when the switch end of the first relay U8 is connected with the normally closed contact U8-4 and the port SELECT3 of the first relay U9 is low, the switch end of the first relay U9 is connected with the normally open contact T1-4; when the switch end of the first relay U8 is connected with the normally open contact U8-5 and the port SELECT1 of the first relay U7 is connected to a low level, the switch end of the first relay U7 is connected to the normally open contact T1-2, namely, the inductance control command controls the connection state of the contacts of the first relay U8, and the first relay U8 and the inductance control command jointly control the connection state of the contacts of the first relay U7 and the first relay U9. It is understood that the normally closed contact and the normally open contact of the first relay U8 can also be electrically connected to the inductor series connection point with reference to the first relay U7 and the first relay U9, and at this time, the contact connection states of the first relay U7, the first relay U8 and the first relay U9 are all controlled by an inductor control command.

In some specific embodiments, when the first relay U7, the first relay U8, and the first relay U9 are not operating, the inductor selection circuit switches the inductor to the inductor L5; when the first relay U9 works and the first relay U7 and the first relay U8 do not work, the inductor selection circuit switches the inductor into an inductor L4; when the first relay U8 works and the first relay U7 and the first relay U9 do not work, the inductance selection circuit switches the inductance into an inductance L3 and an inductance L4; when the first relay U7 and the first relay U8 are operated and the first relay U9 does not operate, the inductance selection circuit switches the inductance into the inductance L2, the inductance L3 and the inductance L4. Inductance L1, inductance L2, inductance L3, inductance L4 and inductance L5 are the I-shaped inductance of different inductance values, and when inductance selection circuit switched into different inductance, the inductance of being connected with the output module electricity also can corresponding change, influences the amplitude and/or the width of the pulse waveform of output module output, realizes the narrow pulse output of frequency conversion electrotherapy device, makes the human skin of being in contact with the output module feel obvious, and then has improved frequency conversion electrotherapy device's physiotherapy effect.

In some embodiments, referring to fig. 3, the electrode impedance detection circuit includes a first operational amplifier and a second operational amplifier, the output terminal U2-5 of the first operational amplifier is electrically connected to the non-inverting input terminal of the second operational amplifier, the non-inverting input terminal U8-2 of the first operational amplifier is electrically connected to the output module, and the non-inverting input terminal U8-2 of the first operational amplifier is electrically connected to the switch terminal of the first relay U8. The electric signal of the output module is input to the electrode impedance detection circuit through an input end U8-2 of a first operational amplifier, the electric signal is rectified by diodes D6 and D7, filtered by capacitors C10 and C11, a direct current voltage with a certain amplitude is generated at two ends of a resistor R25, and then the direct current voltage is input to a second operational amplifier through the first operational amplifier, wherein the first operational amplifier is a voltage follower, the second operational amplifier amplifies the direct current voltage according to a certain multiple and outputs the amplified direct current voltage from an IMP _ TEST end, the output signal is collected by an MCU system and is subjected to A/D conversion to obtain an impedance value corresponding to the electric signal of the output module, when the impedance value is lower than a preset threshold range, the current acting on human skin is increased to damage the skin, the MCU system generates sound and/or displays alarm, and turns off an inductance selection circuit and/or the output module, the safety of the human body contacted with the variable-frequency electrotherapy device and the circuit safety of the variable-frequency electrotherapy device are ensured. It is understood that the amplification factor of the second operational amplifier and the preset threshold range can be adaptively adjusted according to actual situations.

Specifically, the output end of the second operational amplifier circuit is further electrically connected with capacitors C12 and C13, capacitors C12 and C13 are connected in parallel, the DC-DC power supply module provides 5V direct-current voltage for the electrode impedance detection circuit, and the capacitors C12 and C13 perform filtering processing on the 5V direct-current voltage, so that interference signals in the circuit are weakened, and the electrode impedance detection circuit is more stable.

In some embodiments, referring to fig. 4, the power amplifying circuit includes a push-pull circuit and a switch circuit, the switch circuit is electrically connected to the MCU system through a WAVE OUT1 terminal, the switch circuit is electrically connected to the push-pull circuit, and one terminal of the push-pull circuit is electrically connected to the driver circuit, wherein the driver circuit is electrically connected to a series node of an inductor L4 and an inductor L5 of the inductor selecting circuit through a T1-5 terminal. The switch circuit comprises a triode Q13, the push-pull circuit comprises a triode Q12 and a triode Q11, and the collector of the triode Q13 is connected with the bases of a triode Q12 and a triode Q11 respectively. The driving circuit comprises a field effect tube QD3, and the drain electrode of the field effect tube QD3 is connected to the T1-5 terminal. The MCU system receives a control signal, realizes the regulation and the superposition output of PWM and PFM, inputs the control signal into the power amplification circuit from the WAVE OUT1 end, strengthens the drive of the field effect tube QD3 through the amplification of the push-pull circuit, and the field effect tube QD3 is electrically connected with the inductance selection circuit, namely, the current intensity and the pulse width output by the inductance selection circuit are influenced, and finally the power amplification effect is realized.

In some embodiments, referring to fig. 5, the output module includes an output electrode circuit, the output electrode circuit includes a plurality of second relays, specifically, a second relay U10 and a second relay U11, one ends of the second relay U10 and the second relay U11 are respectively connected to a 5V power provided by the DC-DC power circuit, the other ends READY-1 and READY-2 of the second relay U10 and the second relay U11 are respectively electrically connected to the MCU system, a normally open contact U10-2 of the second relay U11 is electrically connected to a switch end of the second relay U10, only when both the ports READY-1 and READY-2 receive a low level sent by the MCU system, the switch end U8-2 of the second relay U11 is connected with the normally open contact U10-2 of the second relay U11, and at the moment, the normally open contact OUTA of the second relay U10 is connected with the switch end U10-2 of the second relay U10. The normally open contact OUTA of the second relay U10 connects the two electrode outputs 1 and 2, and specifically, the normally open contact OUTA of the second relay U10 is electrically connected to the electrode output 1, and the electrode output 2 is grounded. The output module acts the received output signal on the human body through the two electrode output ends 1 and 2 to realize the electrotherapy effect

The switch end of the second relay U11 is connected with the input end of the electrode impedance detection circuit through the U8-2 end, the electrode impedance detection circuit detects the electric signal of the output module through the U8-2 end, the electrode impedance detection circuit inputs the detected electric signal of the output module into the MCU system, the MCU system converts the electric signal into a corresponding impedance value, when the converted impedance value is lower than a preset threshold value, the MCU system sends out sound and/or displays an alarm, READY-1 and READY-2 of the second relay U10 and the second relay U11 are controlled to be connected with high level, the turn-off of the output electrode circuit is controlled, the safety of the frequency conversion electrotherapy device circuit is guaranteed, and the damage to the skin of a human body acted by the frequency conversion electrotherapy device when the impedance is low and the output current is increased is avoided.

The switch end of the second relay U11 is electrically connected with the first relay U8 of the inductance selection circuit through U8-2, the MCU system receives the control signal and generates a corresponding inductance selection instruction to control the working states of the first relays U7, U8 and U9, so as to control the inductance selection circuit to perform inductance switching, the output electrode circuit is connected to different inductances through U8-2, thereby changing the output pulse waveform width, amplitude and other changes of the output electrode circuit, and improving the physical therapy effect.

The embodiment of the invention realizes the change of the width, the amplitude and the like of the pulse waveform output by the output electrode circuit through the inductance selection circuit, so that the skin of a human body has obvious feeling on the output micro-current, and the physical therapy effect is improved. And, different people have different human body impedance, electrode impedance detection circuitry controls the operating condition of inductance selection circuit and/or output electrode circuit through the signal of telecommunication of the output module that detects and human body contact to realize the turn-off of output signal, can prevent because the start-up is in the twinkling of an eye, or when the improper condition such as bumping appears in the electrotherapy in-process two electrode output terminals, because output current increases, cause the user to receive amazing condition emergence suddenly, guaranteed user and frequency conversion electrotherapy device circuit safe in utilization.

The embodiment of the invention also provides a variable-frequency electrotherapy instrument, which comprises the variable-frequency electrotherapy instrument and an output component described in the embodiment, wherein the output component is electrically connected with the output module, namely two electrode output ends 1 and 2 of the output module are respectively electrically connected with one output component. The output assembly includes temperature detection circuit, and temperature detection circuit is connected with MCU system electricity, and temperature detection circuit detects output assembly temperature signal to feed back temperature signal to the MCU system, the MCU system carries out the comparison with temperature signal and preset threshold value, and when temperature signal exceeded preset threshold value scope, the MCU system reported to the police and suggested, for example: an audible alarm and/or a display alarm, etc. Specifically, a cavity is limited to the output assembly, and when the output assembly was the copper pot, hot water can be poured into in the copper pot, set up temperature detection circuit in the copper pot, the temperature that will detect shows in the LCD touch-sensitive screen, when temperature detection circuit detected that the copper pot temperature is less than preset threshold value, sounded and/or display warning. The copper pot acts on the skin of a human body, and electrotherapy and thermotherapy are combined, so that the user experience and the treatment effect are improved to a certain extent. When the medicine is smeared on the skin of a human body, the medicine is promoted to be absorbed by the skin of the human body under the action of micro-current output by the variable-frequency electro-therapeutic apparatus, and the electro-therapeutic effect is improved.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.