Radio frequency circuit and radio frequency beauty instrument

Abstract

The present application provides a radio frequency circuit and a radio frequency beauty instrument. The radio frequency circuit includes an input end, an output end, a first isolation module, a second isolation module, a radio frequency conversion module, a filtering and voltage stabilizing module, and a transformer; the first isolation module is connected between the input end and the radio frequency conversion module, and is used to electrically isolate the input end from the radio frequency conversion module; the transformer is connected between the radio frequency conversion module and the filtering and voltage stabilizing module, and the transformer, the radio frequency conversion module, and the filtering and voltage stabilizing module constitute a power converter, and the transformer is used to electrically isolate the radio frequency conversion module from the filtering and voltage stabilizing module; the second isolation module is connected between the filtering and voltage stabilizing module and the output end, and the second isolation module is used to electrically isolate the filtering and voltage stabilizing module from the output end. Triple isolation is formed by the first isolation module, the transformer, and the second isolation module, so as to achieve isolation of each circuit module of the radio frequency circuit and improve the safety, reliability, and stability of the radio frequency circuit.

Description

Technical Field

[0001] The present application relates to the technical field of radio frequency beauty instruments, and in particular to a radio frequency circuit and a radio frequency beauty instrument. Background Art

[0002] At present, the various circuit modules in the RF circuits of home RF beauty devices on the market are directly connected, without any electrical isolation or only simple first-level electrical isolation measures. It is difficult to meet the safety voltage insulation requirements. The insulation isolation level of the product is low, and there is a certain safety risk in use. Summary of the invention

[0003] To this end, the present application provides a radio frequency circuit and a radio frequency beauty instrument to solve the above technical problems.

[0004] The first aspect of the present application provides a radio frequency circuit, which includes: an input end, an output end, a first isolation module, a second isolation module, a radio frequency conversion module, a filtering and voltage stabilizing module, and a transformer; the input end is used to access a DC voltage; the first isolation module is connected between the input end and the radio frequency conversion module, and the first isolation module is used to electrically isolate the input end from the radio frequency conversion module, and couple the DC voltage input from the input end to the radio frequency conversion module; the radio frequency conversion module is used to convert the DC voltage into a first AC voltage; the transformer is connected between the radio frequency conversion module and the filtering and voltage stabilizing module, and the transformer is connected to the radio frequency conversion module and the filtering and voltage stabilizing module. The modules form a power converter, and the transformer is used to electrically isolate the RF conversion module from the filtering and voltage stabilizing module, and is used to convert the first AC voltage output by the RF conversion module to generate a second AC voltage, and output it to the filtering and voltage stabilizing module; the filtering and voltage stabilizing module is used to filter and stabilize the second AC voltage output by the transformer to obtain a third AC voltage; the second isolation module is connected between the filtering and voltage stabilizing module and the output end, and the second isolation module is used to electrically isolate the filtering and voltage stabilizing module from the output end, and is used to couple the third AC voltage output by the filtering and voltage stabilizing module to the output end so as to output it through the output end.

[0005] A second aspect of the present application provides a radio frequency beauty instrument, which includes a radio frequency circuit and an electrode. The radio frequency circuit is the aforementioned radio frequency circuit, and the output end of the radio frequency circuit is connected to the electrode. The radio frequency circuit is used to generate radio frequency energy, and the electrode can contact the skin to transmit the radio frequency energy to the skin.

[0006] In the present application, the RF circuit includes an input end, an output end, a first isolation module, a second isolation module, a RF conversion module, a filtering and voltage stabilizing module and a transformer; the input end is used to access a DC voltage, and the first isolation module is connected between the input end and the RF conversion module to electrically isolate the input end from the RF conversion module, and also to electrically isolate the external power supply from the RF circuit, thereby reducing the interference and noise caused by the external input to the RF circuit, and improving the safety, stability and reliability of the RF circuit; the transformer is connected between the RF conversion module and the filtering and voltage stabilizing module, and the transformer, the RF conversion module and the filtering and voltage stabilizing module constitute a power converter, the RF conversion module is used to convert the DC voltage into a first AC voltage, and the transformer is used to convert the output of the RF conversion module The first AC voltage is converted to generate a second AC voltage, which is output to the filtering and voltage stabilizing module, and the RF conversion module is electrically isolated from the filtering and voltage stabilizing module to reduce the interference and noise between the RF conversion module and the filtering and voltage stabilizing module, and improve the safety, stability and reliability of the RF circuit. The filtering and voltage stabilizing module is used to filter and stabilize the second AC voltage output by the transformer to obtain a third AC voltage to obtain an RF current that meets the requirements. The output end can be connected to a load. The second isolation module is connected between the filtering and voltage stabilizing module and the output end to electrically isolate the filtering and voltage stabilizing module from the output end, and also to electrically isolate the RF circuit from the load, thereby reducing the interference and noise caused by the load to the RF circuit, and improving the safety, stability and reliability of the RF circuit. The first isolation module, the transformer and the second isolation module form triple isolation, isolate each circuit module of the RF circuit, and improve the safety of the RF circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the implementation manner will be briefly introduced below. Obviously, the drawings described below are some implementation manners of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0008] Figure 1 A structural block diagram of a radio frequency beauty instrument provided in an embodiment of the present application;

[0009] Figure 2 A structural block diagram of a radio frequency circuit provided in the first embodiment of the present application;

[0010] Figure 3 A structural block diagram of a radio frequency circuit provided in the second embodiment of the present application;

[0011] Figure 4 This is a structural block diagram of the radio frequency circuit provided in the third embodiment of the present application. DETAILED DESCRIPTION

[0012] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0013] In the description of this application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components; it can be a communication connection; it can be an electrical connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0014] See also Figure 1 , Figure 1 This is a structural block diagram of the radio frequency beauty instrument provided in an embodiment of the present application.

[0015] like Figure 1 As shown, in some embodiments, the RF beauty instrument 100 includes a RF circuit 200 and an electrode 201, the RF circuit 200 includes an input terminal 10 and an output terminal 16, the input terminal 10 can be connected to an external power supply 202, the output terminal 16 is connected to the electrode 201, the RF circuit 200 is used to generate RF energy, and the electrode 201 can contact the skin to transmit the RF energy to the skin.

[0016] Thus, radio frequency energy is input into the skin, and due to the existence of bioresistance in the skin tissue, the tissue inside the skin is heated, thereby promoting the regeneration and reorganization of collagen and elastic fibers, improving the elasticity and firmness of the skin, stimulating the cell metabolism inside the skin, accelerating the metabolism and removal of pigments, and thus reducing the appearance of spots and freckles.

[0017] Among them, radio frequency energy is a high-frequency electromagnetic energy, usually operating in the frequency range of thousands of hertz to tens of megahertz.

[0018] The material of the electrode 201 is a conductive material, which may be but is not limited to metal, metal alloy or conductive plastic, etc. The shape of the electrode 201 may be but is not limited to plate, spherical or needle-shaped, etc.

[0019] See also Figure 2 , Figure 2 This is a structural block diagram of the radio frequency circuit provided in the first embodiment of the present application.

[0020] like Figure 2 As shown, in the first embodiment, the RF circuit 200 includes an input terminal 10, a first isolation module 11, a RF conversion module 12, a transformer 13, a filtering and voltage stabilizing module 14, a second isolation module 15 and an output terminal 16; the input terminal 10 is used to access a DC voltage; the first isolation module 11 is connected between the input terminal 10 and the RF conversion module 12, and the first isolation module 11 is used to electrically isolate the input terminal 10 from the RF conversion module 12, and couple the DC voltage input from the input terminal 10 to the RF conversion module 12; the RF conversion module 12 is used to convert the DC voltage into a first AC voltage; the transformer 13 is connected between the RF conversion module 12 and the filtering and voltage stabilizing module 14, and the transformer 13 is connected to the RF conversion module 12 and the filtering and voltage stabilizing module 14. The wave stabilization module 14 constitutes a power converter, and the transformer 13 is used to electrically isolate the RF conversion module 12 from the filtering and stabilizing module 14, and is used to convert the magnitude of the first AC voltage output by the RF conversion module 12 to generate a second AC voltage, and output it to the filtering and stabilizing module 14; the filtering and stabilizing module 14 is used to filter and stabilize the second AC voltage output by the transformer 13 to obtain a third AC voltage; the second isolation module 15 is connected between the filtering and stabilizing module 14 and the output end 16, and the second isolation module 15 is used to electrically isolate the filtering and stabilizing module 14 from the output end 16, and is used to couple the third AC voltage output by the filtering and stabilizing module 14 to the output end 16 for output through the output end 16.

[0021] In the present application, the RF circuit 200 includes an input end 10, an output end 16, a first isolation module 11, a second isolation module 15, a RF conversion module 12, a filtering and voltage stabilizing module 14 and a transformer 13; the input end 10 is used to access a DC voltage, and the first isolation module 11 is connected between the input end 10 and the RF conversion module 12 to electrically isolate the input end 10 from the RF conversion module 12, and also to electrically isolate the external power supply 202 from the RF circuit 200, thereby reducing the interference and noise caused by the external input to the RF circuit 200, and improving the safety, stability and reliability of the RF circuit 200; the transformer 13 is connected between the RF conversion module 12 and the filtering and voltage stabilizing module 14, and the transformer 13, the RF conversion module 12 and the filtering and voltage stabilizing module 14 form a power converter, the RF conversion module 12 is used to convert the DC voltage into a first AC voltage, and the transformer 13 is used to convert the RF The first AC voltage output by the frequency conversion module 12 is converted to generate a second AC voltage, and is output to the filtering and voltage stabilizing module 14, and the RF conversion module 12 is electrically isolated from the filtering and voltage stabilizing module 14 to reduce the interference and noise between the RF conversion module 12 and the filtering and voltage stabilizing module 14, and improve the safety, stability and reliability of the RF circuit 200. The filtering and voltage stabilizing module 14 is used to filter and stabilize the second AC voltage output by the transformer 13 to obtain a third AC voltage to obtain an RF current that meets the requirements. The output end 16 can be connected to a load. The second isolation module 15 is connected between the filtering and voltage stabilizing module 14 and the output end 16 to electrically isolate the filtering and voltage stabilizing module 14 from the output end 16, and also to electrically isolate the RF circuit 200 from the load, thereby reducing the interference and noise caused by the load to the RF circuit 200, and improving the safety, stability and reliability of the RF circuit 200. The first isolation module 11 , the transformer 13 , and the second isolation module 15 form triple isolation to isolate the various circuit modules of the radio frequency circuit 200 , thereby improving the safety of the radio frequency circuit 200 .

[0022] The first isolation module 11, the transformer 13 and the second isolation module 15 may be used to isolate current and voltage.

[0023] In the first embodiment, the first isolation module 11 and the second isolation module 12 are of the same type, both including a relay or a photoelectric coupler. In some other embodiments, the first isolation module 11 and the second isolation module 15 are of different types, the first isolation module 11 includes one of a relay and a photoelectric coupler, and the second isolation module 15 includes the other of a relay and a photoelectric coupler.

[0024] Among them, through the switching operation of the relay, the electrical signal can be isolated from one circuit to another. The relay controls the switching state of the contacts by manipulating the magnetic field generated by the electromagnetic coil, thereby achieving electrical isolation between circuits. The specific process is as follows: 1. Electromagnetic coil excitation: When current is passed through the electromagnetic coil of the relay, the coil will generate a magnetic field; 2. Magnetic field attraction: The generated magnetic field will attract the movable end of the contact, causing it to be attracted from the original separation state to the contact state. In this state, the electrical signal can be transmitted from one circuit to another; 3. Contact switching: When the electromagnetic coil stops being excited or a reverse current is passed, the magnetic field disappears, and the contacts return to their original separation state, thereby cutting off the transmission of the electrical signal. In this way, the relay can achieve circuit isolation. During the operation of the relay, the input circuit and the output circuit are physically separated by the contacts, thereby ensuring the electrical isolation between the input signal and the output signal.

[0025] Among them, the photocoupler can be composed of a light-emitting diode (LED) and a photoresistor (phototransistor or phototransistor), and isolation between circuits is achieved through the conversion of optical signals. The specific working principle is as follows: 1. Input circuit: The signal in the input circuit acts on the light-emitting diode (LED), and the luminous intensity of the LED can be changed by controlling the current of the LED. 2. Optical coupling: When the LED emits a light signal, the light signal will pass through the isolation layer of the coupler and illuminate the other side of the isolation layer. 3. Output circuit: On the other side of the isolation layer, the light signal will be received by the photoresistor and generate a current or voltage output proportional to the intensity of the light signal. Since there is no direct electrical connection between the circuits on both sides of the photocoupler, electrical isolation can be achieved. Current and voltage are only transmitted through the conversion of optical signals, thereby achieving isolation between circuits.

[0026] The electrical isolation of the transformer 13 is achieved by using the principle of electromagnetic induction. When current flows through the input winding, a magnetic field is generated in the iron core of the transformer 13. This magnetic field induces a voltage in the output winding, thereby achieving signal transmission. In this process, there is no direct electrical connection between the input winding and the output winding, so electrical isolation is achieved.

[0027] The specific working principle is as follows: 1. Input signal: The input signal is input into the transformer 13 through the input winding. 2. Magnetic field induction: When current flows through the input winding, a magnetic field is generated in the iron core of the transformer 13. 3. Magnetic field transmission: The magnetic field is transmitted to the output winding through the iron core. 4. Output signal: In the output winding, the change of the magnetic field will induce a voltage, and this voltage is the output signal. This principle of magnetic field induction enables electrical isolation between the input signal and the output signal. In the transformer 13, the magnetic field signal is transmitted between the input and output windings through the iron core, and there is no direct electrical connection. In this way, the electrical noise, interference and mutual influence between the input and output signals can be isolated.

[0028] See also Figure 3 , Figure 3 This is a structural block diagram of the radio frequency circuit provided in the second embodiment of the present application.

[0029] like Figure 3 As shown, similar to the first embodiment, but different from the first embodiment, in the second embodiment, the RF circuit 200 also includes a third isolation module 17 and a controller 18; the third isolation module 17 is connected between the controller 18 and the RF conversion module 12, and the controller 18 is used to control and adjust the RF conversion module 12 so that the RF conversion module 12 converts the DC voltage into a first AC voltage, and the third isolation module 17 is used to perform communication isolation between the controller 18 and the RF conversion module 12.

[0030] Among them, the controller 18 can control and adjust the frequency of the first AC voltage output by the RF conversion module 12, and the RF conversion module 12 may include an oscillator, and the frequency of the oscillator is controlled and adjusted to control and adjust the frequency of the first AC voltage. By setting the third isolation module 17 between the controller 18 and the RF conversion module 12, the communication isolation between the controller 18 and the RF conversion module 12 is achieved, thereby reducing the communication interference and noise between the controller 18 and the RF conversion module 12, and improving the communication stability, safety and reliability. Among them, communication isolation is a type of electrical isolation, and communication isolation is the isolation of communication signals.

[0031] In the second embodiment, the third isolation module 17 is also connected between the controller 18 and the filtering and voltage stabilizing module 14, and the controller 18 is used to monitor the third AC voltage output by the filtering and voltage stabilizing module 14, and control and adjust the RF conversion module 12 based on the monitored data; the third isolation module 17 is used to perform communication isolation between the controller 18 and the filtering and voltage stabilizing module 14.

[0032] The controller 18 is used to monitor the third AC voltage output by the filter and voltage regulator module 14, and control and adjust the RF conversion module 12 based on the monitored data. For example, when the frequency of the third AC voltage output by the filter and voltage regulator module 14 is monitored to be too high, the frequency of the first AC voltage output by the RF conversion module 12 is controlled to be reduced. By setting the third isolation module 17 between the controller 18 and the filter and voltage regulator module 14, the communication isolation between the controller 18 and the filter and voltage regulator module 14 is achieved, thereby reducing the communication interference and noise between the controller 18 and the filter and voltage regulator module 14, and improving the communication stability, safety and reliability.

[0033] In the second embodiment, the third isolation module 17 includes at least one of a digital isolation chip, an analog isolation chip and a transformer 13 .

[0034] Among them, the digital isolation chip (Digital Isolation IC) is an integrated circuit chip for digital signal isolation. The digital isolation chip may include an isolation circuit and a photocoupler. The isolation circuit is mainly used to electrically isolate the input signal and the output signal, so as to achieve the purpose of signal isolation. The isolation circuit is usually composed of an isolation transformer 13, a capacitor and an amplifier, etc., which can effectively isolate the input and output circuits to avoid signal interference and mutual influence. The photocoupler is the core component in the digital isolation chip, which is used to convert electrical signals into optical signals and perform photoelectric isolation. The photocoupler can be composed of a light emitting diode and a phototransistor. When the input signal acts on the light emitting diode, the light emitting diode will emit a certain light signal, and the phototransistor will receive and convert it into an electrical signal. In this way, the input signal and the output signal can achieve isolation of electro-optical conversion and photoelectric conversion.

[0035] Among them, the analog isolation chip (Analog Isolation IC) is an integrated circuit specially designed to achieve analog signal isolation. It can be composed of components such as an optocoupler, a transformer 13 or an electromagnetic isolator. Specifically, 1. The optocoupler isolation chip is composed of an optical transmitter and an optical receiver. The input signal is converted into an optical signal, and the signal is transmitted to the output side through a photoelectric converter. The optical signal is converted back into an electrical signal by the optical receiver on the output side. 2. The transformer isolation chip uses inductive coupling to achieve signal isolation. The input signal is transmitted to the magnetic core of the transformer through the input winding, and the output signal is induced from the output winding. The input winding and the output winding are transmitted through the magnetic core to achieve electrical isolation. 3. The electromagnetic isolator isolation chip uses the shielding effect of the electromagnetic field to achieve electrical isolation of the signal. The input signal generates a magnetic field through the input winding, and the output signal is induced through the output winding. The input winding and the output winding are physically isolated by electromagnetic shielding materials (such as metal, a composite material composed of metal and insulating material, an electromagnetic wave absorbing material or a carbon fiber material) to prevent mutual interference.

[0036] See also Figure 4 , Figure 4 This is a structural block diagram of a radio frequency circuit 200 provided in the third embodiment of the present application.

[0037] like Figure 4As shown, similar to the second embodiment, but different from the second embodiment, in the third embodiment, the radio frequency circuit 200 further includes a battery management module 19, a battery 20, a fourth isolation module 21, a switch module 22 and a detection module 23; the fourth isolation module 21, the battery management module 19, the battery 20 and the switch module 22 are sequentially connected between the input end 10 and the radio frequency conversion module 12, the first isolation module 11 is connected between the input end 10 and the switch module 22, and the first isolation module 11 is connected in parallel with the fourth isolation module 21, the battery management module 19 and the battery 20; the fourth isolation module 21 is used to electrically isolate the input end 10 from the battery management module 19, and the battery management module 19 Used to receive the DC voltage output by the fourth isolation module 21, and control the charging of the battery 20, the battery 20 is used to provide a DC voltage to the RF conversion module 12; the two ends of the detection module 23 are respectively connected to the input end 10 and the third isolation module 17, the detection module 23 is used to detect the level of the input end 10 and feed it back to the controller 18, the third isolation module 17 is also used to isolate the communication between the detection module 23 and the controller 18; the controller 18 is also connected to the switch module 22, the controller 18 controls the switch module 22 based on the level of the input end 10 so that the battery 20 is connected to the RF conversion module 12, or the first isolation module 11 is connected to the RF conversion module 12.

[0038] Among them, when the detection module 23 detects that the level of the input end 10 is a high level, the controller 18 controls the switch module 22 to connect the first isolation module 11 and the RF conversion module 12, so as to provide a DC voltage to the RF conversion module 12 through the external power supply 202, so that the RF device provided with the RF circuit 200 can work when it is connected to the external power supply 202; when the detection module 23 detects that the level of the input end 10 is a low level, the controller 18 controls the switch module 22 to connect the battery 20 and the RF conversion module 12, so as to provide a DC voltage to the RF conversion module 12 through the battery 20, so that the RF device provided with the RF circuit 200 can also work when it is not connected to the external power supply 202.

[0039] The external power source 202 may be a direct current power source, or a combination of an alternating current power source and an adapter, wherein the adapter is used to convert the alternating current output by the alternating current power source into direct current.

[0040] The switch module 22 may be a single-pole double-throw switch.

[0041] By providing the battery 20, when the RF circuit 200 is applied to the RF device, it can work and output RF energy even when there is no external power supply 202 to power it. The fourth isolation module 21 is connected between the input end 10 and the battery management module 19 to electrically isolate the input end 10 from the battery management module 19, and also to electrically isolate the external power supply 202 from the RF circuit 200, thereby reducing the interference and noise caused by the external input to the RF circuit 200, and improving the safety, stability and reliability of the RF circuit 200.

[0042] In the third embodiment, the third isolation module 17 is also connected between the controller 18 and the battery 20 , and the third isolation module 17 is used to isolate the communication between the controller 18 and the battery 20 , and the controller 18 is used to monitor and collect the power level of the battery 20 .

[0043] Furthermore, when the RF device provided with the RF circuit 200 is provided with a module such as a display or a voice announcer, the controller 18 can also control the display to display the power level of the battery 20 , or control the voice announcer to announce the power level of the battery 20 .

[0044] The third isolation module 17 is disposed between the controller 18 and the battery 20 to achieve communication isolation between the controller 18 and the battery 20, thereby reducing communication interference and noise between the controller 18 and the battery 20 and improving communication stability, safety and reliability.

[0045] In the third embodiment, the third isolation module 17 is also connected between the controller 18 and the battery management module 19, and the third isolation module 17 is used to isolate the communication between the controller 18 and the battery management module 19. The controller 18 is used to receive the charging status of the battery 20 fed back by the battery management module 19, and perform corresponding operations based on the charging status of the battery 20.

[0046] Wherein, the corresponding operation is performed based on the charging status of the battery 20. When the RF device provided with the RF circuit 200 is provided with a display, a voice announcer and other modules, the controller 18 can also control the display to display the charging status of the battery 20, or control the voice announcer to announce the charging status of the battery 20. When the battery 20 is fully charged, the battery management module 19 can be controlled to sleep to reduce power consumption.

[0047] The third isolation module 17 is set between the controller 18 and the battery management module 19 to achieve communication isolation between the controller 18 and the battery management module 19, thereby reducing communication interference and noise between the controller 18 and the battery management module 19 and improving communication stability, safety and reliability.

[0048] The above is an implementation method of the embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the embodiment of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. A radio frequency circuit, characterized in that: The radio frequency circuit includes: an input end, an output end, a first isolation module, a second isolation module, a radio frequency conversion module, a filtering and voltage stabilization module, a transformer, a third isolation module and a controller; The input terminal is used to access a DC voltage; The first isolation module is connected between the input end and the radio frequency conversion module, and is used to electrically isolate the input end from the radio frequency conversion module, and couple the DC voltage input from the input end to the radio frequency conversion module; The radio frequency conversion module is used to convert the DC voltage into a first AC voltage; The transformer is connected between the RF conversion module and the filtering and voltage stabilizing module. The transformer, the RF conversion module and the filtering and voltage stabilizing module form a power converter. The transformer is used to electrically isolate the RF conversion module from the filtering and voltage stabilizing module, and is used to convert the magnitude of the first AC voltage output by the RF conversion module to generate a second AC voltage, and output it to the filtering and voltage stabilizing module. The filtering and voltage stabilizing module is used to filter and stabilize the second AC voltage output by the transformer to obtain a third AC voltage; The second isolation module is connected between the filtering and voltage stabilizing module and the output end, and is used to electrically isolate the filtering and voltage stabilizing module from the output end, and to couple the third AC voltage output by the filtering and voltage stabilizing module to the output end, so as to output it through the output end; The third isolation module is connected between the controller and the radio frequency conversion module, the controller is used to control and adjust the radio frequency conversion module so that the radio frequency conversion module converts the DC voltage into a first AC voltage, and the third isolation module is used to perform communication isolation between the controller and the radio frequency conversion module; The third isolation module is also connected between the controller and the filtering and voltage stabilizing module, and the controller is used to monitor the third AC voltage output by the filtering and voltage stabilizing module, and control and adjust the radio frequency conversion module based on the monitored data; the third isolation module is used to perform communication isolation between the controller and the filtering and voltage stabilizing module; The radio frequency circuit also includes a fourth isolation module, a battery, a battery management module, and a switch module; The fourth isolation module, the battery management module, the battery and the switch module are connected in sequence between the input end and the RF conversion module, the first isolation module is connected between the input end and the switch module, the first isolation module is connected in parallel with the fourth isolation module, the battery management module and the battery; the fourth isolation module is used to electrically isolate the input end from the battery management module, the battery management module is used to receive the DC voltage output by the fourth isolation module and control the charging of the battery, and the battery is used to provide a DC voltage to the RF conversion module.

2. The radio frequency circuit according to claim 1, characterized in that: The first isolation module and the second isolation module are of the same type, and both include relays or photoelectric couplers.

3. The radio frequency circuit according to claim 1, characterized in that: The first isolation module and the second isolation module are of different types. The first isolation module includes one of a relay and a photoelectric coupler, and the second isolation module includes the other of a relay and a photoelectric coupler.

4. The radio frequency circuit according to claim 1, characterized in that: The third isolation module includes at least one of a digital isolation chip, an analog isolation chip and a transformer.

5. The radio frequency circuit according to claim 1, characterized in that: The radio frequency circuit also includes a detection module; The two ends of the detection module are respectively connected to the input end and the third isolation module, the detection module is used to detect the level of the input end and feed it back to the controller, and the third isolation module is also used to isolate the communication between the detection module and the controller; The controller is also connected to the switch module. The controller controls the switch module based on the level of the input end so that the battery is connected to the radio frequency conversion module, or the first isolation module is connected to the radio frequency conversion module.

6. The radio frequency circuit according to claim 1, characterized in that: The third isolation module is also connected between the controller and the battery. The third isolation module is used to isolate the communication between the controller and the battery. The controller is used to monitor and collect the power level of the battery.

7. The radio frequency circuit according to claim 1, characterized in that: The third isolation module is also connected between the controller and the battery management module. The third isolation module is used to isolate the communication between the controller and the battery management module. The controller is used to receive the battery charging status fed back by the battery management module and perform corresponding operations based on the battery charging status.

8. A radio frequency beauty instrument, characterized in that: The radio frequency beauty instrument includes a radio frequency circuit and an electrode. The radio frequency circuit is the radio frequency circuit described in any one of claims 1 to 7. The output end of the radio frequency circuit is connected to the electrode. The radio frequency circuit is used to generate radio frequency energy. The electrode can contact the skin to transmit the radio frequency energy to the skin.

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