Multifunctional switching circuit and massager

Abstract

The embodiment of the present invention relates to the technical field of switching circuits, and discloses a multifunctional switching circuit and a massager. By setting a switching circuit, the multifunctional switching circuit realizes the reasonable switching of EMS / RF functions, skin detection functions, and third-party load functions, achieves the coordination and coexistence among various functions, reduces the complexity of the device, and avoids the mutual independence among multiple functions. The controller controls the EMS / RF control circuit and the third load circuit respectively by obtaining the first detection signal and the third detection signal, realizes the precise scheduling of functions, and avoids power waste and damage to the human body.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of switching circuits, and particularly to a multifunctional switching circuit and a massager. Background Art

[0002] With the rapid development of technology and the increasing improvement of life, more and more women have a strong psychological pursuit of beauty. To meet this demand, some people have invented ultrasonic beauty instruments that can shape the body, and some have invented power light beauty instruments that can remove acne, whiten the skin, and remove wrinkles. Some have designed RF radio frequency instruments to stimulate the regeneration of collagen in the bottom layer of the skin to achieve the effect of skin tightening.

[0003] The inventors of the present application found during the research process that the existing beauty devices with multiple functions are relatively single in function. When users use them, they often need to use a combination of multiple devices, which is relatively costly and inconvenient to carry. Summary of the Invention

[0004] In view of the above problems, the embodiments of the present invention provide a multifunctional switching circuit and a massager, which are used to solve the problem of the need to use a combination of multiple devices in the prior art.

[0005] According to one aspect of the embodiments of the present invention, a multifunctional switching circuit is provided. The multifunctional switching circuit includes: a controller, a switching circuit, an EMS / RF control circuit, a skin detection circuit, a first contact point, a first loop detection circuit, a second contact point, a third contact point, a third loop detection circuit, and a third load circuit;

[0006] One end of the switching circuit is electrically connected to the first contact point and the second contact point respectively, and the other end is electrically connected to the EMS / RF control circuit and the skin detection circuit respectively under the control of the controller;

[0007] One end of the first contact point is connected to the switching circuit, and the other end is used to contact the human body and is connected to the first loop detection circuit; the first loop detection circuit is started or disconnected under the control of the controller;

[0008] One end of the second contact point is connected to the switching circuit, and the other end is used to contact the human body;

[0009] The third contact point is used to contact the human body and is connected to the third loop detection circuit. The third loop detection circuit is electrically connected to the controller and is used to detect a third detection signal between the first contact point and the third contact point and send the third detection signal to the controller;

[0010] The EMS / RF control circuit is electrically connected to the controller and emits an EMS signal or an RF signal under the control of the controller; the EMS / RF control circuit is further configured to send a first detection signal flowing through the second contact point to the controller;

[0011] When the controller controls the switch circuit to electrically connect the first contact point and the second contact point to the EMS / RF control circuit, the controller receives the first detection signal and adjusts the EMS / RF control circuit according to the first detection signal;

[0012] When the controller controls the switch circuit to electrically connect the first contact point and the second contact point to the skin detection circuit, the controller controls the skin detection circuit;

[0013] When the controller controls the switch circuit to disconnect, the controller activates the first loop detection circuit, obtains a third detection signal, and controls the third load circuit according to the third detection signal.

[0014] According to another aspect of the embodiments of the present invention, a massager is provided, and the massager includes the multi-functional switching circuit described in the above embodiments.

[0015] As can be seen from the above embodiments, the multi-functional switching circuit realizes the reasonable switching of the EMS / RF function, the skin detection function, and the third-party load function by setting the switch circuit, realizes the coordination and coexistence between various functions, reduces the complexity of the device, and avoids the mutual independence between multiple functions. At the same time, the controller controls the EMS / RF control circuit and the third load circuit respectively by obtaining the first detection signal and the third detection signal, realizes the precise scheduling of functions, and avoids power waste and damage to the human body.

[0016] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the specification. And in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following specifically illustrates the specific embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered to be a limitation of the present invention. And throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0018] Figure 1 A functional framework diagram of the multi-functional switching circuit provided by the embodiments of the present invention is shown;

[0019] Figure 2 Shows the circuit diagram of the multi-functional switching circuit provided by the embodiment of the present invention;

[0020] Figure 3 Shows another functional framework diagram of the multi-functional switching circuit provided by the embodiment of the present invention;

[0021] Figure 4A Shows the circuit diagram of the controller provided by the embodiment of the present invention;

[0022] Figure 4B Shows the voltage stabilizing circuit diagram provided by the embodiment of the present invention;

[0023] Figure 5 Shows the EMS / RF control circuit diagram provided by the embodiment of the present invention;

[0024] Figure 6A Shows the skin detection circuit diagram provided by the embodiment of the present invention;

[0025] Figure 6B Shows the output simulation diagram of the skin detection circuit provided by the embodiment of the present invention;

[0026] Figure 6C Shows the moisture value curve of the skin detection result provided by the embodiment of the present invention;

[0027] Figure 6D Shows the water-oil curve diagram of the skin detection result provided by the embodiment of the present invention;

[0028] Figure 7 Shows the second loop detection circuit provided by the embodiment of the present invention;

[0029] Figure 8 Shows the first loop detection circuit and the third loop detection circuit diagrams provided by the embodiment of the present invention;

[0030] Figure 9 Shows the photon drive circuit diagram provided by the embodiment of the present invention;

[0031] Figure 10 Shows the Peltier drive circuit diagram provided by the embodiment of the present invention;

[0032] Figure 11A Shows the motor drive circuit diagram provided by the embodiment of the present invention;

[0033] Figure 11B Shows the buzzer circuit diagram provided by the embodiment of the present invention. Detailed implementation manners

[0034] The embodiments of the technical solution of the present invention will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present invention more clearly, so they are only examples and cannot be used to limit the protection scope of the present invention.

[0035] Please refer to Figure 1 , Figure 1 which shows the functional block diagram of the multi-functional switching circuit proposed in the embodiment of the present invention. The multi-functional switching circuit includes: a controller 100, a switching circuit 200, an EMS / RF control circuit 300, a skin detection circuit 400, a first contact point TB1, a first loop detection circuit 500, a second contact point P2, a third contact point P1, a third loop detection circuit 700, and a third load circuit.

[0036] One end of the switching circuit 200 is electrically connected to the first contact point TB1 and the second contact point P2 respectively, and the other end is electrically connected to the EMS / RF control circuit 300 and the skin detection circuit 400 respectively under the control of the controller 100. The switching circuit 200 is an electrically controlled switching circuit 200 and is switched under the control of the controller 100. The switching circuit 200 can connect the first contact point TB1 and the second contact point P2 to the EMS / RF control circuit 300, or can electrically connect the first contact point TB1 and the second contact point P2 to the skin detection circuit 400, so that the EMS / RF control circuit 300 and the skin detection circuit 400 are in contact with the skin through the first contact point TB1 and the second contact point P2 respectively.

[0037] One end of the first contact point TB1 is connected to the switching circuit 200, and the other end is used to contact the human body and is connected to the first loop detection circuit 500. The first contact point TB1 is an exposed electrode, that is, the first loop detection circuit 500 can be in contact with the human body through the first contact point TB1; the first loop detection circuit 500 is started or disconnected under the control of the controller 100 and is used to detect whether the first contact point TB1 is in contact with the human body; one end of the second contact point P2 is connected to the switching circuit 200, and the other end is used to contact the human body. The second contact point P2 is also an exposed electrode; the third contact point P1 is used to contact the human body and is connected to the third loop detection circuit 700. The third loop detection circuit 700 is electrically connected to the controller 100 and is used to detect the third detection signal between the first contact point TB1 and the third contact point P1 and send the third detection signal to the controller 100.

[0038] The EMS / RF control circuit 300 is electrically connected to the controller 100 and emits an EMS signal or an RF signal under the control of the controller 100; the EMS / RF control circuit 300 is further configured to send a first detection signal flowing through the second contact point P2 to the controller 100. Since one end of the second contact point P2 is in contact with the human body and the other end is connected to the switch circuit 200, when the switch circuit 200 connects the second contact point P2 to the EMS / RF circuit, the EMS / RF circuit can detect the electrical signal flowing through the second contact point P2 and generate a first detection signal.

[0039] When the controller 100 controls the switch circuit 200 to electrically connect the first contact point TB1 and the second contact point P2 to the EMS / RF control circuit 300, the controller 100 receives the first detection signal and adjusts the EMS / RF control circuit 300 according to the first detection signal, that is, at this time, the controller 100 controls the EMS / RF circuit to operate. The first detection signal changes in real time with the magnitude of the facial impedance, and the change can also reflect the contact degree between the first contact point TB1 and the second contact point P2 and the skin, as well as the firmness of the skin. The EMS / RF control circuit 300 adjusts the transmission power of the EMS function or the RF function according to the first detection signal to process the skin with the optimal power.

[0040] When the controller 100 controls the switch circuit 200 to electrically connect the first contact point TB1 and the second contact point P2 to the skin measurement circuit 400, the controller 100 controls the skin measurement circuit 400, that is, the skin measurement circuit 400 can be started to measure the skin. Due to the control of the switch circuit 200, the skin measurement circuit 400 and the EMS / RF circuit can only be started separately, avoiding the conflict between the skin measurement circuit 400 and the EMS / RF function.

[0041] When the controller 100 controls the switch circuit 200 to disconnect, the controller 100 starts the first loop detection circuit 500 to obtain a third detection signal and controls the third load circuit according to the third detection signal. When the third contact point P1 is in contact with the skin, the third loop detection circuit 700 obtains a third detection signal flowing through the third contact point P1, and judges whether there is contact with the skin through the third detection signal. When there is contact, the controller 100 starts the third load circuit. In this way, it is avoided that other functions are started without contacting the skin, wasting power and causing damage to the human body at the same time.

[0042] As can be seen from the above embodiments, the multi-functional switching circuit realizes the reasonable switching of the EMS / RF function, the skin detection function, and the third-party load function by setting the switching circuit 200, realizes the coordination and coexistence among various functions, reduces the complexity of the device, and avoids the mutual independence among multiple functions. At the same time, the controller 100 controls the EMS / RF control circuit 300 and the third load circuit respectively by obtaining the first detection signal and the third detection signal, realizes the precise scheduling of functions, and avoids power waste and damage to the human body.

[0043] Further, as Figure 1 shown, for the EMS / RF control circuit 300, it includes two functions, namely the EMS function and the RF function. Among them, the RF function is a very important part of the electromagnetic spectrum. The energy of radio and microwave belongs to the category of electromagnetic radiation energy, and they are collectively referred to as radio frequency. Radio frequency is measured in frequency, and its range can be extended from several hundred KHZ to several hundred MHZ. When the radio frequency starts to work, it can change the electrode polarity of the electric field in biological tissue one million times within 1 second. The charged tissue particles in the electric field change their polarity at the frame frequency. The natural impedance of the dermal tissue acts on the electron movement to generate heat. This friction caused by the electron movement causes a columnar heating effect in the deep layer of the skin. This thermal effect will initially change the collagen, resulting in collagen contraction, and then regenerate new collagen, leading to dermal reconstruction and thickening. The full name of the EMS function is Electrical Muscle Stimulation, and its Chinese name is muscle current stimulation technology. Its principle is to directly stimulate the motor nerve through an external current, trigger muscle contraction movement, and thus directly and effectively achieve the purpose of muscle building or shaping. The low-frequency current frequency can continuously and effectively move the muscle frequency. If the frequency used is higher than a certain frequency, the muscle tension will start to decline. The muscle cannot meet its neurophysiological conditions, and thus cannot obtain an ideal exercise effect. In addition, the muscle uses energy and consumes oxygen during exercise.

[0044] Therefore, as can be seen from the above, when the EMS / RF control circuit operates in the EMS mode, the frequency of the input circuit is relatively low. When measuring the electrical signal passing through the second contact point P2, there are often errors, resulting in inaccurate measurement and inability to accurately control the EMS / RF control circuit 300. The embodiment of the present application further proposes to provide a second loop detection circuit 600; the second loop detection circuit 600 is electrically connected to the second contact point P2, detects the electrical signal flowing through the second contact point P2, and outputs a second detection signal to the controller 100; the controller 100 controls the EMS / RF control circuit 300 according to the second detection signal. The second loop detection circuit 600 detects the electrical signal flowing through the second contact point P2 more sensitively, can more accurately obtain the contact condition between the second contact point P2 and the skin, and the controller 100 controls the EMS / RF control circuit 300 more accurately according to the second detection signal.

[0045] As Figure 2 shown, the embodiment of the present invention further describes the multi-functional switching circuit in more detail. As Figure 2 shown, the switch circuit 200 is an electrically controlled double-pole double-throw switch. The middle point of one path of the double-pole double-throw switch is connected to the first contact point TB1, and the middle point of the other path is connected to the second contact point P2; at the same time, one throw of the double-pole double-throw switch is electrically connected to the EMS / RF control circuit 300, and the other throw is electrically connected to the skin detection circuit 400. That is, under the control of the controller 100, the switch circuit 200 can electrically connect the first contact point TB1 and the second contact point P2 to the EMS / RF control circuit 300, or can electrically connect the first contact point TB1 and the second contact point P2 to the skin detection circuit 400. Since it is a double-throw switch, the first contact point TB1 and the second contact point P2 can only be selectively electrically connected to the EMS / RF control circuit 300 and the skin detection circuit 400, and cannot be connected simultaneously.

[0046] One end of the first contact point TB1 is connected to one path of the double-pole double-throw switch, and the other end is connected to the first loop detection circuit 500 through the thyristor PCR606. The control electrode of the thyristor PCR606 is connected to the KG3 port of the controller 100 through the resistor R43. The controller 100 controls the on / off of the first thyristor through the control electrode, and thus can control the on / off of the first loop detection circuit 500. When the multifunctional switching circuit needs to start the third load circuit, the controller 100 controls the switch circuit 200 to disconnect the connections between the first contact point TB1 and the second contact point P2 and the EMS / RF control circuit 300 and the skin detection circuit 400, and turns on the thyristor PCR606 through the KG3 port. Then, the first loop detection circuit 500 is connected to the first contact point TB1. The controller 100 starts the first loop detection circuit 500 through the DR-PWM port to supply power to the first contact point TB1, so that an electrical signal can be formed between the first contact point TB1 and the third contact point P1, and the electrical signal between the first contact point TB1 and the third contact point P1 is detected to generate a third detection signal. The controller 100 receives the third detection signal through the CHECK S port and controls the third load circuit according to the third detection signal.

[0047] The controller 100 receives the first detection signal through the port CKECH P2, receives the second detection signal through the CHECK P1 port, receives the third detection signal through the CHECK S port, controls the EMS function of the EMS / RF control circuit 300 through the EMS-PWM port, controls the RF function of the EMS / RF control circuit 300 through the RF-PWM port, and controls the skin detection circuit 400 through the HZ port. The third load circuit includes circuits with various other functions, such as Figure 3 shown.

[0048] such as Figure 3 shown, in addition to the EMS / RF control circuit 300 and the skin detection circuit 400, the third load circuit further includes a massage circuit composed of a motor drive circuit 800 and a buzzer 900, a refrigeration and heating circuit composed of a Peltier drive circuit 1000, and a photon whitening circuit composed of a photon drive circuit 1100, etc. The above-mentioned multiple functional modules form a massage instrument with complete functions. All the above functional modules are combined through the multifunctional switching circuit, skillfully realizing the switching and combination of various functions, simplifying the structure of the massage instrument, and integrating the original multiple independent devices into a device with complete functions.

[0049] To describe the above multi-functional switching circuit in more detail, the implementation methods of the EMS / RF control circuit 300, the skin detection circuit 400, the photon drive circuit 1100, the Peltier circuit, and the massage circuit will be described separately below.

[0050] As Figure 4A shown, it is the circuit diagram of the controller 100 provided by the embodiment of the present invention. The controller 100 can adopt common programmable controller components such as PLC, digital processing chip DSP, or single-chip microcomputer. In this embodiment, we exemplarily adopt the STM32F030R8T6 programmable control chip as the controller 100. The specific pins are as Figure 4A shown, including signal input pins, signal output pins, and input and output pins, etc. For example: DCDC EN pin: The controller 100 serves as an enable terminal to enable each control unit; RF-PWM pin: Serves as an RF control signal output terminal and is connected to the EMS / RF control circuit 300; EMS-PWM pin: Serves as an EMS control signal output terminal and is connected to the EMS / RF control circuit 300; DR-PWM pin: Used to output a control signal to the first loop detection circuit 500; HZ pin: Used to output a control signal to the skin detection circuit 400; KG1 and KG2 pins: Used to output a control signal to the switch circuit 200; KG3 pin: Used to control the on and off of the thyristor; CHECK P1 pin: Used to receive the second detection signal; CHECK P2 pin: Used to receive the first detection signal; CHECK S pin: Used to receive the third detection signal; Motor pin: Used to output a control signal to the motor drive circuit 800; BUZZER pin: Used to output a control signal to the buzzer 900; PET +, PET- pins: Used to output a temperature control signal to the Peltier circuit; CHECK WEN pin: Used to detect the current of the Peltier; NTC1, NTC2 pins: Used to detect temperature information; and so on. More specific and detailed descriptions of the chip pins will not be elaborated here. Those of ordinary skill in the art can select appropriate pins for control according to needs. In the following text, when specific pins are used, their pin names will be directly cited, and it can be directly understood as being connected to the pins of the controller 100, and the corresponding relationship with the controller 100 will not be described again.

[0051] As Figure 4B shown, it is the voltage stabilization circuit diagram provided by the embodiment of the present invention. The embodiment of the present invention uses a wireless charging method to provide power for the multi-functional switching circuit. The wireless charging circuit is designed with DS_JDS9002, which is a three-in-one chip integrating wireless reception, lithium battery protection chip, and charging management. The maximum charging current is 450 mA, with a dedicated communication protocol; the voltage stabilization chip is designed with the XC6206P33 chip, outputting a stable 3.3V, and the minimum leakage current is 7 μA.

[0052] In the multifunctional switching circuit, the control of the EMS / RF control circuit 300 and the skin detection circuit 400 is very important. They cannot be turned on simultaneously. The detailed switching control circuit diagram is shown in Figure 5, and will be described in detail below.

[0053] Figure 5 This is the EMS / RF control circuit diagram provided by the embodiment of the present invention. The EMS / RF control circuit diagram is composed of a transformer, a MOS tube drive circuit, a boost circuit, etc. The controller 100 outputs waveforms of different frequencies through the EMS-PWM pin to drive the MOS tube to work. When the controller 100 sends a 1MHz carrier wave through the EMS-PWM pin, it drives the MOS tube to work, and the transformer outputs a high-voltage sine wave signal to generate a high-frequency signal. When the high-frequency signal acts on the skin, it will produce a warm effect, thereby promoting the regeneration of collagen in the bottom layer of the skin. When the controller 100 sends a 33Hz carrier wave through the EMS-PWM pin, it drives the MOS tube to work, and the transformer outputs a low-frequency alternating current signal. When it acts on the skin, it will produce an electric stimulation sensation, achieving the effect of skin tightening.

[0054] Specifically, as Figure 5 shown, the EMS / RF control circuit 300 includes an EMS / RF power supply circuit, a transformer L4, an N-MOS tube Q15, and a triode Q17. It can be seen from Figure 5 that the EMS / RF power supply circuit includes a triode Q5, a PMOS tube U7, a boost module U6, etc. The above voltage stabilizing circuit provides voltage for the EMS / RF power supply circuit through the VBAT pin, and is connected to the PMOS tube U7. The gate G of the PMOS tube U7 is connected to the enable terminal DCDC-EN of the controller 100 through the triode Q5. The enable terminal DCDC-EN is connected to the base of the triode Q5 through a current limiting resistor R38. The gate G of the PMOS tube U7 is connected to the collector of the triode Q5, and the emitter of the triode Q5 is grounded; the controller 100 controls the conduction and disconnection of the PMOS tube U7 by controlling the triode Q5. The PMOS tube U7 is used for protection and can protect the boost module U6 from being damaged. The drain D of the PMOS tube U7 is connected to the boost module U6 through a current limiting resistor R47 to limit the current to I = 0.3 / R47 = 0.3 / 0.2 = 1.5A. EC1 and C29 are filter capacitors. After passing through the boost module U6, the output voltage VOUT = 1.25(1 + R35 / R44) = 13.75V. The VOUT is connected to the tap 8 of the transformer L4 to provide an input voltage for the transformer.

[0055] The primary coil of the transformer L4 includes taps 6, 8, and 10. The output terminal VOUT of the boost module U6 is connected to the tap 8, and the tap 10 of the transformer L4 is grounded. The tap 6 of the transformer L4 is connected to the N-MOS transistor Q15. The secondary coil of the transformer L4 includes taps 3 and 6. The tap 3 is connected to the first contact point TB1, and the tap 6 is connected to the second contact point P2 for contacting the human body.

[0056] The controller 100 is connected to the gate of the N-MOS transistor Q15 through the EMS-PWM pin, and is used to output carrier signals with different frequencies to the transformer L4 through the N-MOS transistor Q15. The drain of the N-MOS transistor Q15 is connected to the tap 6 of the transformer L4, and the source of the N-MOS transistor Q15 is grounded through the current-limiting resistor R31. The N-MOS transistor is an N-channel MOS transistor.

[0057] When the controller 100 emits a low-frequency signal of 33HZ through the EMS-PWM pin, the transformer L4 outputs a low-frequency AC signal. When it acts on the skin, it will produce an electric stimulation sensation, achieving the effect of skin tightening. When the controller 100 emits a carrier wave of 1MHz through the EMS-PWM pin, it drives the MOS transistor to work, and the transformer outputs a high-voltage sine wave signal to generate a high-frequency signal. The high-frequency signal acting on the skin will produce a warming effect, thereby promoting the regeneration of collagen in the bottom layer of the skin.

[0058] Further, in order to further improve the effect of the controller 100 emitting carrier signals, the embodiment of the present invention further adds a triode Q17 to the EMS / RF control circuit 300. The controller 100 is connected to the base of the triode Q17 through the pin RF-PWM, and is connected to the collector of the triode Q17 through the tap 10 of the transformer L4. The emitter of the triode Q17 is grounded. The controller 100 can alternately send AC carrier signals to the transformer through the two pins EMS-PWM and RF-PWM, so that the transformer has higher working efficiency. At the same time, further, since a reverse voltage is generated during the operation of the transformer and it is very easy to break down the MOS transistor, in order to further protect the MOS transistor, the embodiment of the present invention sets a diode D8 at the tap 10 of the transformer L4. The negative pole of the diode D8 is connected to the tap 10 of the transformer L4, and the positive pole is grounded. When the transformer generates a negative voltage, the diode D8 conducts, grounding the tap 10 of the transformer, avoiding the breakdown of the N-MOS transistor Q15 caused by the generation of negative voltage, thereby protecting the N-MOS transistor Q15.

[0059] Further, in order to more accurately control the transmission power of the EMS / RF control circuit 300 so that it can dynamically adjust the transmission power according to the contact conditions of the first contact point TB1 and the second contact point P2 with the skin, in an embodiment of the present invention, a monitoring point S1 is further set at the source electrode of the N-MOS transistor Q15 as the first detection signal output terminal and connected to the CHECK P2 pin of the controller 100. The controller 100 can detect the electrical signal flowing through the second contact point P2 through CHECK P2, thereby obtaining the first detection signal. When the first detection signal obtained by the controller 100 is empty, it indicates that the second contact point P2 is not in contact with the skin; when the first detection signal is too large, it indicates that the second contact point P2 has less contact with the skin, and the transmission power needs to be increased; when the first detection signal is too small, it indicates that the second contact point P2 has more contact with the skin, and the transmission power needs to be decreased. Of course, the above control process can also be set in the opposite way, and specific settings are not limited.

[0060] Therefore, as can be seen from the above, the EMS / RF control circuit 300 provided by the embodiment of the present invention realizes the sharing of EMS functions and RF functions by the controller 100 transmitting different frequency signals, simplifying the circuit; at the same time, by setting the detection point S1, the controller 100 can obtain the contact degree between the second contact point P2 and the skin in real time, and then can accurately adjust the transmission power; further, by setting a diode at the tap 10 of the transformer, the N-MOS is protected from being broken down, playing a very good protective role.

[0061] Figure 6A The circuit diagram of the skin measurement circuit 400 proposed by the embodiment of the present invention is shown. The skin measurement circuit 400 is mainly used for measuring the moisture of the human skin, can obtain the skin condition, and then adjust the EMS / RF function or other third-party load functions according to the skin condition. The skin measurement circuit 400 includes a voltage follower circuit, a skin contact point, and an AD detection circuit.

[0062] The skin contact points are the first contact point TB1 and the second contact point P2; the skin measurement circuit 400 is connected through the contact point 4 and the second contact point P2, connected to the first contact point TB1 through the contact point 5, and contacts the skin through the first contact point TB1 and the second contact point P2. The contact point 4 is the input terminal of the AD detection circuit, and the contact point 5 is the output terminal of the voltage follower circuit.

[0063] The circuit structure of the voltage follower circuit is as Figure 6AAs shown, the voltage follower circuit includes a current-limiting resistor R62 and a single operational amplifier U9A. The square wave signal is input to the single operational amplifier U9A through the current-limiting resistor R62. The output terminal of the single operational amplifier U9A is connected to the first contact point TB1. When the controller 100 outputs a carrier signal through the HZ pin, after passing through the voltage follower circuit, a signal with the same waveform is output at the first contact point TB1 and reaches the skin.

[0064] The AD detection circuit includes an isolation capacitor C24, a filtering capacitor C26, and a diode D11. The second contact point P2 is connected to one end of the isolation capacitor C24. The other end of the isolation capacitor C24 is connected to the positive electrode of the diode D11. The negative electrode of the diode D11 is connected to a filtering circuit composed of a resistor R63 and C26 and is connected to the FZ_AD pin of the controller 100 to output a skin detection result to the controller 100.

[0065] Specifically, in the skin measurement process, the controller 100 outputs a 4KHZ square wave to the voltage follower circuit through the HZ pin. The voltage follower circuit generates a signal with the same waveform as the input signal at the first contact point TB1, and applies the output signal to the contacted skin. Due to the capacitive reactance characteristic of the skin, a sharp waveform will be formed at the second contact point. After this waveform passes through the AD detection circuit, a stable FZ_AD signal is output. The simulation effect is as Figure 6B shown. This simulation waveform shows that the 4KHZ square wave signal passes through the detection circuit and the human skin and finally outputs a DC signal, and the output voltages obtained for different human impedances are different.

[0066] In the actual skin measurement process, due to the fact that the electrical impedance characteristics of human tissues are much more complex than those of general objects, the most obvious feature is that the value of the electrical impedance will change with the change of the measurement frequency. Because the intracellular fluid tissue in human cells does not simply exhibit the characteristics of resistance, the interaction between the intracellular water and the cell membrane exists more in the form of capacitive characteristics. In order to analyze more skin characteristics and obtain multi-frequency point information, the embodiment of the present invention uses a square wave pulse signal as the excitation source, which is easy to combine with digital circuits and has a relatively wide frequency spectrum. As shown in 6C, it is a curve of moisture corresponding to the AD value collected, showing the corresponding relationship between the voltage value and the moisture content. As Figure 6D shown, it is a water-oil comparison curve obtained through AD detection. By performing corresponding algorithms based on the curve, the water-oil characteristics of the human skin can be measured, so as to reflect the oily, dry, combination and other skin characteristics of the human skin, and different gear functions are enabled for different skin characteristics, so as to better achieve the effect of improving the skin.

[0067] Therefore, as can be seen from the above, the skin detection circuit 400 proposed in the embodiment of the present invention, by setting a voltage follower circuit and an AD detection circuit, the controller 100 transmits a square wave signal to the voltage follower circuit, which is applied to the human skin, and the AD detection circuit detects the signal generated by the human skin, accurately reflecting the condition of the human skin, enabling the controller 100 to adjust the EMS / RF control circuit 300 or other third-party load circuits according to the detection results, and being able to implement skin care more precisely.

[0068] Furthermore, in practical applications, the EMS / RF function and the skin detection function need to be separated and cannot be turned on simultaneously. How to coordinate the usage time between the two is a very important issue, and it is necessary to effectively prevent damage to the skin caused by the user's misoperation. For example Figure 5 and Figure 6A As shown, in order to coordinate the EMS / RF function and the skin detection function, the embodiment of the present invention provides a switch circuit 200. The switch circuit 200 is an electrically controlled double-pole double-throw switch. The midpoint 3 of one switch is connected to the first contact point TB1, and the midpoint 6 of the other switch is connected to the second contact point P2; one throw of the switch circuit 200 includes contact points 2 and 7; the other throw includes contact points 5 and 4; the controller 100 is connected to the switch controller 100YX-JDQ through the KG1 and KG2 pins. When KG1 = 0 and KG2 = 1, the 2nd pin and the 3rd pin of the double-pole double-throw switch are connected, and the 7th pin and the 6th pin are connected. The first contact point TB1 and the second contact point P2 contact both sides of the human skin, conducting the EMS / RF control circuit 300. At the same time, the skin detection circuit 400 is disconnected. When KG1 = 1 and KG2 = 0, the 5th pin and the 3rd pin of the double-pole double-throw switch are connected, and the 4th pin and the 6th pin are connected. The first contact point TB1 and the second contact point P2 contact both sides of the human skin, conducting the skin detection circuit 400. At the same time, the EMS / RF control circuit 300 is disconnected, and the skin detection function is turned on. Of course, the double-pole double-throw switch can appear in the form of a relay or be operated in other electrical switch ways, which is not limited here.

[0069] As can be seen from the above, by providing the switch circuit 200 in the embodiment of the present invention, the scheduling of the EMS / RF control circuit 300 and the skin detection circuit 400 is conveniently realized, preventing damage to the skin caused by simultaneous activation due to the user's misoperation.

[0070] Furthermore, on the basis of the above EMS / RF control circuit 300, the embodiment of the present invention further proposes another circuit structure, as Figure 5 and Figure 7 shown, in Figure 5In the illustrated embodiment, the controller 100 obtains the first detection signal by setting the first detection signal output terminal, thereby obtaining the contact condition between the second contact point P2 and the skin, and further adjusting the transmission power of the EMS / RF control circuit 300. The applicant has found in further research that when the EMS function is used, the controller 100 sends a carrier signal with a frequency of 33 Hz and the power is relatively small, and the electrical signal flowing through the second contact point P2 is often relatively weak, and the accurate first detection signal cannot be effectively obtained through the first detection signal output terminal. Based on this, on the basis of the above embodiment, the present application further adds a second loop detection circuit 600, as Figure 7 shown.

[0071] In Figure 7 , the second loop detection circuit 600 includes a detection circuit composed of a PNP type triode Q18 and an NPN type triode Q19, detects the electrical signal flowing through the second contact point, and outputs a second detection signal to improve the detection sensitivity of the second contact point P2. In Figure 7 , the second contact point P2 is electrically connected to the emitter of the PNP type triode Q18, the collector of the PNP type triode Q18 outputs the second detection signal to the controller 100 through a resistor R50, the base of the PNP type triode Q18 is connected to the collector of the NPN type triode Q19, the base of the NPN type triode Q19 is connected to the enable terminal DCDC EN of the controller 100, and the emitter of the NPN type triode Q19 is grounded; the collector of the PNP type triode Q18 is connected to the CHECK P1 port of the controller 100 through a current limiting resistor R50 and a pull-up resistor R53. At the same time, in order to prevent the current from flowing back and breaking down the PNP type triode Q18, the embodiment of the present invention also sets a diode D9 at the collector of the PNP type triode Q18, the negative electrode of the second diode D9 is connected to the collector of the PNP type triode Q18, and the positive electrode is grounded. Through the second loop detection circuit 600, when the controller 100 issues an enable signal through the DCDC EN port, the NPN type triode Q19 is turned on. When no electrical signal passes through the second contact point P2, the PNP type triode Q18 is in a cut-off state; when a current passes through the second contact point P2, even if it is a very weak signal, as long as the trigger condition of the emitter of the PNP type triode Q18 is satisfied, the PNP type triode Q18 will be turned on, and the second detection signal output terminal will output the second detection signal to the CHECK P1 port of the controller 100.

[0072] Through the above-mentioned second loop detection circuit 600, when the EMS / RF control circuit 300 is in the EMS mode, since the current flowing through the second contact point P2 is relatively weak, at this time, a current signal is generated at the second contact point P2. The current flowing through the second contact point P2 is adjusted in sensitivity through the second detection signal, the detection sensitivity is improved, and the second detection signal is output, enabling the controller 100 to more accurately know the contact conditions of the first contact point TB1 and the second contact point P2 with the skin.

[0073] As can be seen from the above, by setting the second loop detection circuit 600, the problem of inaccurate detection caused by too small current under the EMS function is solved, enabling the controller 100 to more accurately master the contact conditions of the first contact point TB1 and the second contact point P2 with the skin, and enabling more accurate control of the EMS / RF control circuit 300 and other third load circuits.

[0074] Further, when the function of the EMS / RF control circuit 300 is turned off and the controller 100 needs to activate the third-party load function, for example: the photon detection function, it is also necessary to detect whether the first contact point TB1 or the second contact point P2 is in contact with the human skin. If other third-party load functions are activated when not in contact with the skin, it may cause harm to the human body. Therefore, the embodiment of the present invention further proposes a circuit structure diagram of a skin contact judgment circuit, as Figure 8 shown, which shows the diagrams of the first loop detection circuit 500 and the third loop detection circuit 700 for detecting whether the contact point is in contact with the skin.

[0075] As Figure 8As shown, the skin contact determination circuit includes a first loop detection circuit 500 and a third loop detection circuit 700. The first loop detection circuit 500 includes a PNP transistor Q13, an NPN transistor Q16, and a thyristor PCR606; the base of the NPN transistor Q16 is connected to the DR-PWM pin of the controller 100 through a current limiting resistor R39 for receiving the control signal of the controller 100. The emitter of the NPN transistor Q16 is grounded, and the collector is connected to the base of the PNP transistor Q13 through a resistor R36; the emitter of the PNP transistor Q13 is connected to a 3.3V voltage, and the collector is connected to one end of the thyristor PCR606 through a resistor R17; the other end of the thyristor PCR606 is connected to the first contact point TB1, and one end is connected to the collector of the PNP transistor Q13. The control electrode of the thyristor is electrically connected to the KG3 port of the controller 100. When the controller 100 sends a high-level signal through the DR-PWM port and at the same time controls the thyristor PCR606 to conduct through the KG3 port, the PNP transistor Q13 and the NPN transistor Q16 in the first loop detection circuit 500 conduct to provide a voltage signal for the first contact point TB1.

[0076] The third loop detection circuit 700 includes a third contact point P1, a pull-up resistor R60, and a capacitor C7. The CHECK S port of the controller 100 is directly connected to the third contact point P1 for receiving a third detection signal.

[0077] When the controller 100 needs to activate the photon function, the controller 100 outputs a control signal through the DR-PWM port. As shown in the figure above, the first contact point TB1 contacts the human face, and the third contact point P1 is the hand electrode piece for the hand-held end. DR-PWM controls the conduction and cut-off of the NPN transistor Q16. Q13 is a PNP transistor. When DR-PWM is at a high level, the Q16 transistor conducts, and at the same time the Q13 transistor conducts. R1 is a current limiting resistor and a voltage dividing resistor. PCR606 is a unidirectional thyristor. When KG3 is at a high level, the thyristor conducts, and the voltage reaches the face. When the hand touches the P1 electrode piece, the CHECK-S has a voltage of about 1.65V. The system then determines that the hand and the face are in contact with the skin at the same time, and at this time, the corresponding load is turned on. Thus, the photon drive circuit 1100 is activated to prevent direct eye damage when the photon is turned on; or the vibration massage function is activated to give a sense of intelligence; the Peltier kinetic energy can also be activated. Other functions are enabled through the first loop detection circuit 500 and the third loop detection circuit 700, which has higher safety and anti-mis-triggering functions.

[0078] In Figure 9Among them, it is the photon drive circuit 1100. The photon drive circuit 1100 includes NPN transistors Q8, Q9, a red LED lamp LED-R, and a yellow LED lamp LED-Y. The JP1 is a drive board. The drive board is connected to a 3.3V voltage. The base of the transistor Q8 is connected to the LED-R through a resistor R19 for driving the LED lamp. The collector is connected to the drive board JP1, and the emitter is grounded through a resistor R23. The base of the transistor Q9 is connected to the LED-Y through a resistor R20 for driving the LED lamp. The collector is connected to the drive board JP1, and the emitter is grounded through a resistor R20. Therefore, in the embodiment of the present invention, by combining the first loop detection circuit 500, the third loop detection circuit 700, and the photon drive circuit 1100, before starting the photon drive circuit 1100, first, the first loop detection circuit 500 and the third loop detection circuit 700 are used to determine whether the first contact point TB1 and the third contact point P1 are in contact with the human skin. Only when in contact with the human skin, the photon drive circuit 1100 is started, avoiding harm to the human body.

[0079] Further, the multifunctional switching circuit further includes a Peltier drive circuit 1000, as Figure 9 and Figure 10 shown, Figure 10 is the Peltier drive circuit 1000, Figure 9 which includes an NTC detection circuit. The Peltier drive circuit 1000 is used to warm or cool the human skin, which helps the pores of the skin to expand and contract, and can play a very good role in tightening the skin.

[0080] As Figure 10 shown, the Peltier circuit is a bridge drive circuit, including NPN transistors Q3 and Q4, P-MOS transistors Q1 and Q2, and N-MOS transistors Q10 and Q11. The Q1, Q2, Q10, and Q11 form a bridge drive circuit. The controller 100 controls the Peltier drive circuit 1000 through the PET+ and PET- ports. Among them, J12PIN is a thermoelectric cooler, and the thermoelectric cooler is a thermocouple. When current passes through the thermocouple, one node dissipates heat while the other node absorbs heat. Therefore, heating and cooling effects can be achieved.

[0081] PET+ and PET- are respectively applied to both sides of the thermoelectric cooler, generating the effects of refrigeration and heating. By controlling PET+ and PET- as well as the temperature sensors at both ends of the Peltier through the PWM waveform, an accurate temperature control effect is achieved. The base of the NPN transistor Q3 is connected to the controller, and the collector of the NPN transistor Q3 is connected to the gate of the P-channel MOS transistor Q2; the drain of the P-channel MOS transistor Q2 is connected to the thermoelectric cooler; the drain of the N-channel MOS transistor Q10 is connected to the thermoelectric cooler, and the gate of the N-channel MOS transistor Q10 is connected to the controller. The base of the NPN transistor Q4 is connected to the controller, and the collector of the NPN transistor Q4 is connected to the gate of the P-channel MOS transistor Q1; the drain of the P-channel MOS transistor Q1 is connected to the thermoelectric cooler; the drain of the N-channel MOS transistor Q11 is connected to the thermoelectric cooler, and the gate of the N-channel MOS transistor Q11 is connected to the controller. The source of the N-channel MOS transistor Q11 is connected to the source of the N-channel MOS transistor Q10 and grounded through the current detection resistor R13.

[0082] When the controller 100 outputs a control signal to the NPN transistor Q3 through the output terminal PET- via the resistor R7 and outputs a control signal to the N-MOS transistor Q10 through the output terminal PET-, Q3, Q2, and Q10 are turned on, and PET- acts on one side of the thermoelectric cooler, thereby cooling one side of J12PIN, achieving a refrigeration effect. When the controller 100 outputs a control signal to the NPN transistor Q4 through the output terminal PET+ via the resistor R9 and outputs a control signal to the N-MOS transistor Q11 through the output terminal PET+, Q4, Q1, and Q11 are turned on, and PET+ acts on the other side of the thermoelectric cooler, thereby heating J12PIN, achieving a heating effect. Of course, it is also possible to apply PET+ to the refrigeration side and PET- to the heating side, both of which can make the thermoelectric cooler produce refrigeration or heating effects.

[0083] Furthermore, in order to adjust the temperature more accurately, in the embodiment of the present invention, a current detection resistor R13 is provided between the sources of Q11 and Q10, and a temperature detection point is provided between R13 and the source and connected to the CHECKWEN pin of the controller 100. The controller 100 can detect the current driven by the Peltier by detecting the voltage of CHECK WEN. When controlling the temperature, accurate temperature measurement can be achieved by adjusting the duty cycle of the PWM waveform of PET+ / PET- in combination with the detected current.

[0084] At the same time, in order to further protect the Peltier circuit, the embodiment of the present invention also adds an NTC protection function. When the temperature is too high, heating is stopped. As Figure 9As shown, embodiments of the present invention are provided with thermistors R17 and R18 to detect the temperature of the Peltier circuit. When the temperature is too high, the controller 100 adjusts the Peltier circuit.

[0085] As Figure 9 shown, the thermistors R17 and R18 are usually arranged together with the Peltier circuit to measure the temperature of the Peltier circuit. One end of the thermistor R17 is connected to the drive board JP1, and the other end is grounded through the capacitor C6. A temperature output point is set between the R17 and C6 and connected to the NTC1 pin of the controller 100. One end of the thermistor R18 is connected to the drive board JP1, and the other end is grounded through the capacitor C5. A temperature output point is set between the R18 and C7 and connected to the NTC2 pin of the controller 100. The NTC1 and NTC2 are respectively arranged on both sides of the cooling sheet to collect the temperature of the cooling sheet.

[0086] Therefore, in summary, the Peltier drive circuit 1000 proposed in the embodiments of the present invention is combined with the first loop detection circuit 500 and the third loop detection circuit 700. Only when the controller 100 detects that the first contact point TB1 and the third contact point P1 are in contact with the human body, the Peltier circuit is started to heat or cool the skin, avoiding useless work and saving power. At the same time, temperature detection points are set to achieve precise control of the temperature of the Peltier drive circuit 1000. Further, an NTC detection circuit is also provided to avoid the problem of overheating of the Peltier circuit.

[0087] Further, as Figure 11A and 11B shown, the present invention also provides a massage function. The massage module includes a motor drive circuit 800 and a buzzer circuit. The motor drive circuit 800 and the buzzer circuit cooperate with the first loop detection circuit 500 and the third loop detection circuit 700. When the controller 100 determines that the first contact point TB1 and the third contact point P1 are in contact with the human body, the motor drive circuit 800 and the buzzer circuit can be started.

[0088] Specifically, the motor drive circuit 800 is as Figure 11A shown and includes an NPN-type triode Q6 and a motor DJ1. The base of the triode Q6 is connected to the Motor pin of the controller 100 through a current-limiting resistor R12. The collector of the triode Q6 is connected to the motor DJ1 to drive the motor to vibrate and stop. The buzzer 900 circuit is as Figure 11BAs shown, it includes an NPN transistor Q7 and a buzzer BUZ1. The base of the NPN transistor Q7 is connected to the BUZZER pin of the controller 100 through a current-limiting resistor R14, and the collector is connected to the buzzer BUZ1. The controller 100 outputs a 4KHz waveform to drive the buzzer 900 to operate.

[0089] Therefore, in summary, the motor drive circuit 800 and the buzzer circuit proposed in the embodiments of the present invention, in combination with the first detection circuit and the third loop detection circuit 700, only start the drive circuit and the buzzer 900 to massage the skin when the controller 100 detects that the first contact point TB1, the third contact point P1 are in contact with the human body, avoiding useless work and saving power.

[0090] Furthermore, the embodiments of the present invention also propose a massager, which adopts one or more of the multifunctional switching circuits mentioned in the above embodiments. The specific multifunctional switching circuit is the same as the above description and will not be elaborated here.

[0091] It should be noted that unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present invention should have the ordinary meanings understood by those skilled in the art to which the embodiments of the present invention belong.

[0092] In the description of the embodiments of the present invention, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the embodiments of the present invention.

[0093] In addition, the technical terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. In the description of the embodiments of the present invention, "a plurality" means more than two unless otherwise specifically defined.

[0094] In the description of the embodiments of the present invention, unless otherwise clearly defined and limited, technical terms such as "installation", "connection", "coupling", "fixation" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral one; it may also be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0095] In the description of the embodiments of the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and the description of the present invention. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A multifunctional switching circuit, characterized in that, Comprising: A controller, a switch circuit, an EMS / RF control circuit, a skin detection circuit, a first contact point, a first loop detection circuit, a second contact point, a third contact point, a third loop detection circuit, and a third load circuit; the third load circuit further includes a massage circuit; One end of the switch circuit is electrically connected to the first contact point and the second contact point respectively, and the other end is electrically connected to the EMS / RF control circuit and the skin detection circuit respectively under the control of the controller; One end of the first contact point is connected to the switch circuit, the other end is used to contact the human body, and is connected to the first loop detection circuit; the first loop detection circuit is started or disconnected under the control of the controller; One end of the second contact point is connected to the switch circuit, and the other end is used to contact the human body; The third contact point is used to contact the human body and is connected to the third loop detection circuit. The third loop detection circuit is electrically connected to the controller, and is used to detect a third detection signal between the first contact point and the third contact point, and send the third detection signal to the controller; The EMS / RF control circuit is electrically connected to the controller, and emits an EMS signal or an RF signal under the control of the controller; the EMS / RF control circuit is further used to send a first detection signal flowing through the second contact point to the controller; When the controller controls the switch circuit to electrically connect the first contact point and the second contact point to the EMS / RF control circuit, the controller receives the first detection signal and adjusts the EMS / RF control circuit according to the first detection signal; When the controller controls the switch circuit to electrically connect the first contact point and the second contact point to the skin detection circuit, the controller controls the skin detection circuit; When the controller controls the switch circuit to disconnect, the controller starts the first loop detection circuit, obtains a third detection signal, and controls the third load circuit according to the third detection signal.

2. The multifunctional switching circuit according to claim 1, characterized in that, The switch circuit includes a double-pole double-throw switch. One end of one path of the double-pole double-throw switch is connected to the first contact point; one end of the other path of the double-pole double-throw switch is electrically connected to the second contact point.

3. The multifunctional switching circuit according to claim 1, characterized in that, Further includes a second loop detection circuit; The second loop detection circuit is electrically connected to the second contact point, detects the current signal flowing through the second contact point, and outputs a second detection signal to the controller; The controller controls the EMS / RF control circuit according to the second detection signal.

4. The multifunctional switching circuit according to claim 1, characterized in that, The first contact point is electrically connected to the first loop detection circuit through a first thyristor; The first thyristor includes a control electrode, and the controller controls the on / off of the first thyristor through the control electrode.

5. The multifunctional switching circuit according to claim 1, characterized in that, The EMS / RF control circuit includes an N-channel MOS transistor. A first detection signal output terminal is provided at the source electrode of the N-channel MOS transistor, which is used to detect the current flowing through the second contact point and output a first detection signal to the controller.

6. The multifunctional switching circuit according to claim 5, characterized in that, When the controller determines that the first contact point and the second contact point are in contact with the human body simultaneously according to the first detection signal, it controls the EMS / RF control circuit.

7. The multifunctional switching circuit according to claim 1, characterized in that, The skin detection circuit includes: a voltage follower circuit and an AD detection circuit; One end of the voltage follower circuit is electrically connected to the controller, the other end is electrically connected to the switch circuit, and is electrically connected to the first contact point through the switch circuit; One end of the AD detection circuit is electrically connected to the controller, the other end is electrically connected to the switch circuit, and is electrically connected to the second contact point through the switch circuit.

8. The multifunctional switching circuit according to claim 1, characterized in that, When the controller determines that the first contact point and the third contact point are in contact with the human body simultaneously according to the third detection signal, it activates the third load circuit.

9. The multifunctional switching circuit according to claim 4, characterized in that, The controller is further configured to control the first thyristor to disconnect the connection between the first contact point and the first loop detection circuit when controlling the switch circuit to electrically connect the first contact point and the second contact point to the skin detection circuit.

10. A massager, characterized in that, It includes the multifunctional switching circuit according to any one of claims 1-9.

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