Coupler, radio frequency detection circuit and radio frequency therapeutic instrument
By using a novel coupler in the radiofrequency therapy device, which winds two wires around an iron core, the problem of large size of the radiofrequency detection circuit is solved, achieving miniaturization of the device and stability of signal detection.
Patent Information
- Application Number
- CN202423149453.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-19
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2034-12-19
AI Technical Summary
In existing radiofrequency therapy devices, the radiofrequency detection circuit requires two iron cores to be wound, resulting in a large device size, which is not conducive to miniaturization.
A coupler is used to detect radio frequency forward and reverse voltages by winding two wires around an iron core, which reduces the number of iron cores used and makes the device smaller.
It achieves miniaturization of radio frequency equipment while maintaining the function of radio frequency signal detection, thus improving the compactness of the equipment.
Smart Images
Figure CN223582800U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of radio frequency detection technology, especially a kind of coupler, radio frequency detection circuit and radio frequency therapeutic instrument. BACKGROUND
[0002] Radio frequency beauty equipment mainly refers to the effect of using specific frequency alternating current pulse current (usually above 200kHz) or electromagnetic field (usually 13.56 or 40.68MHz) on human tissue to produce heat effect, so as to promote the recombination and regeneration of human collagen, to achieve the effect of treating skin relaxation, reducing skin wrinkles, shrinking pores, tightening / lifting skin tissue, or treating acne, scar, or reducing fat (fat softening or decomposition) etc.
[0003] The existing radio frequency therapeutic instrument generally adopts the treatment of sticking radio frequency electrode to skin or penetrating into skin inside, and the radio frequency signal of radio frequency electrode needs to be detected in real time during radio frequency treatment process, and the radio frequency detection circuit needs to use two iron cores to be wound, which is large in size and is not conducive to the miniaturization of equipment. SUMMARY
[0004] The utility model discloses a kind of coupler, radio frequency detection circuit and radio frequency therapeutic instrument, to solve the technical problem that radio frequency detection circuit needs to use two iron cores to be wound, which is large in size.
[0005] To achieve the above-mentioned purpose, the coupler according to the utility model is applied to a radio frequency detection circuit and includes an iron core, a first wire, a second wire and a third wire.
[0006] The first wire passes through the center of the iron core, the second wire and the third wire are wound on the iron core, and the second wire and the third wire have the same winding direction. The two ends of the first wire passing through the iron core are a radio frequency input terminal and a radio frequency output terminal. The second wire and the third wire both have an input pin and an output pin.
[0007] In an embodiment, the output pin of the second wire is connected to the input pin of the third wire and a center pin is led out.
[0008] The utility model also provides a radio frequency detection circuit, which includes a sampling circuit and the above-mentioned coupler.
[0009] The sampling circuit is connected to the coupler, and the coupler is connected to a radio frequency input terminal of a main circuit and a radio frequency output terminal of the main circuit, respectively.
[0010] The coupler is used to isolate the radio frequency signal of the main circuit and transmit the radio frequency signal of the main circuit to the sampling circuit.
[0011] The sampling circuit is used to detect the voltage signal in the radio frequency signal.
[0012] In one embodiment, the radio frequency detection circuit includes: a bias circuit;
[0013] The bias circuit is connected to the input terminal of the main circuit and the coupler;
[0014] The bias circuit is used to stabilize the potential of the coupler and provide a bias voltage to the coupler.
[0015] In one embodiment, the radio frequency detection circuit includes: a voltage divider circuit and a voltage regulator circuit;
[0016] The voltage regulator circuit is connected to the voltage divider circuit, and the voltage divider circuit is connected to the sampling circuit and the controller of the main circuit.
[0017] The voltage divider circuit is used to divide the voltage signal and output the divided voltage signal to the controller in the main circuit.
[0018] The voltage regulator circuit is used to stabilize the voltage divider signal output by the voltage divider circuit.
[0019] In one embodiment, pin 1 of the coupler is the RF input terminal and is connected to the bias circuit and the RF input terminal of the main circuit; pin 2 of the coupler is the center pin and is connected to the bias circuit; pin 3 of the coupler is the input pin of the second wire and is connected to the sampling circuit; pin 4 of the coupler is the output pin of the third wire and is connected to the sampling circuit; pin 5 of the coupler is the RF output terminal and is connected to one end of the first capacitor and one end of the second capacitor; the other ends of the first capacitor and the other ends of the second capacitor are connected to the RF output terminal of the main circuit.
[0020] In one embodiment, the bias circuit includes: a third capacitor, a fourth capacitor, and a first resistor;
[0021] One end of the third capacitor is connected to the RF input terminal of the main circuit, and the other end of the third capacitor is connected to one end of the fourth capacitor, one end of the first resistor, and pin 2 of the coupler. The other end of the fourth capacitor and the other end of the first resistor are grounded.
[0022] In one embodiment, the sampling circuit includes: a second resistor, a third resistor, a fourth resistor, and a fifth resistor;
[0023] One end of the second resistor is connected to pin 3 of the coupler, and the other end of the second resistor is connected to the voltage divider circuit, one end of the third resistor and one end of the fourth resistor. The other end of the third resistor is connected to the other end of the fourth resistor, the voltage divider circuit and one end of the fifth resistor. The other end of the fifth resistor is connected to pin 4 of the coupler.
[0024] In one embodiment, the voltage divider circuit includes a sixth resistor, a seventh resistor, an eighth resistor, and a ninth resistor.
[0025] One end of the sixth resistor is connected to the other end of the second resistor, one end of the third resistor, and one end of the fourth resistor. The other end of the sixth resistor is connected to one end of the seventh resistor, the controller in the main circuit, and the voltage regulator circuit. One end of the eighth resistor is connected to the other end of the third resistor, the other end of the fourth resistor, and one end of the fifth resistor. The other end of the eighth resistor is connected to the ninth resistor, the controller in the main circuit, and the voltage regulator circuit. The other ends of the seventh resistor and the ninth resistor are grounded.
[0026] This utility model also proposes a radiofrequency therapy device, which includes the radiofrequency detection circuit described in any of the above embodiments.
[0027] This utility model discloses a coupler, a radio frequency (RF) detection circuit, and a radio frequency therapy device, relating to the field of RF detection technology. The coupler includes: an iron core, a first wire, a second wire, and a third wire; the first wire passes through the center of the iron core, and the second and third wires are both wound around the iron core, with the winding direction of the second and third wires being consistent; the two ends of the first wire passing through the iron core are the RF input terminal and the RF output terminal, and the second and third wires both have input pins and output pins. Compared to the bidirectional / directional couplers of traditional RF detection circuits, this application provides a coupler that uses three insulated wires wound around an iron core for RF forward and reverse voltage detection, eliminating the need for two iron cores and facilitating the miniaturization of RF equipment. Attached Figure Description
[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0029] Figure 1 A schematic diagram of the structure of the first embodiment of the coupler provided by this utility model;
[0030] Figure 2 A circuit diagram of the first embodiment of the coupler provided by this utility model;
[0031] Figure 3 A schematic diagram of the first embodiment of the radio frequency detection circuit provided by this utility model;
[0032] Figure 4 Another module schematic diagram of the first embodiment of the radio frequency detection circuit provided by this utility model;
[0033] Figure 5 A circuit diagram of the second embodiment of the radio frequency detection circuit provided by this utility model.
[0034] Explanation of icon numbers:
[0035] Reference Name Reference Name 100 Coupler T3 Coupler 200 Sampling circuit D1-D2 First to second zener diode 300 Controller of main circuit C1-C4 First to fourth capacitor 400 Radio frequency input terminal of main circuit T1-T2 First to second transformer 500 Radio frequency output terminal of main circuit R1-R9 First to ninth resistor 600 Bias circuit RT Isolation resistor 700 Voltage dividing circuit 800 Voltage stabilizing circuit
[0036] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.
[0038] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.
[0039] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0040] Radiofrequency (RF) cosmetic devices primarily refer to devices that utilize specific frequency alternating pulse currents (usually above 200kHz) or electromagnetic fields (usually 13.56 or 40.68MHz) to act on human tissue and generate a thermal effect, thereby promoting the reorganization and regeneration of human collagen. This can achieve effects such as treating skin laxity, reducing wrinkles, shrinking pores, tightening / lifting skin tissue, treating acne and scars, or reducing fat (fat softening or decomposition).
[0041] Existing radiofrequency therapy devices generally use radiofrequency electrodes that are placed close to or inserted deep into the skin for treatment. During radiofrequency therapy, it is necessary to detect the radiofrequency signal of the radiofrequency electrodes in real time. However, the radiofrequency detection circuit requires two iron cores to be wound, which makes the device bulky and not conducive to miniaturization.
[0042] This application proposes a coupler in which two windings are wound onto a single iron core for detecting radio frequency forward and reverse voltages. This eliminates the need for two iron cores, which is beneficial for miniaturizing radio frequency devices.
[0043] Please see Figure 1 and Figure 2 , Figure 1 This is a structural diagram of the first embodiment of the coupler proposed in this utility model. Figure 2 A circuit diagram of the first embodiment of the coupler provided by this utility model.
[0044] As we can understand, a coupler is a device used to couple signals from one transmission line to another, enabling signal distribution, synthesis, and monitoring. It typically consists of multiple ports, including input ports, output ports, and coupling ports. A coupler comprises a primary coil and one or more secondary coils. When an input signal passes through the primary coil, a portion of the signal energy is coupled into the secondary coils. By detecting the voltage in the secondary coils, the radio frequency signal of the primary coil can be calculated.
[0045] It should be noted that coupler design can be implemented in several ways; radiofrequency therapy devices generally use two radiofrequency transformers. Figure 2 The first transformer T1 is used to detect the main line current between the input and the load, and the second transformer T2 is used to detect the voltage to ground of the main line. The coupling coefficient depends on the transformer turns ratio N.
[0046] RF forward voltage calculation formula:
[0047]
[0048] RF reverse voltage calculation formula:
[0049]
[0050] Where N is the number of turns of the transformer, R T for Figure 2 The sampling resistor Z in L V is the load impedance. f ' is the forward voltage considering only the current, V f "This refers to the forward voltage considering only the voltage itself; the sum of the two is the formula for calculating the forward voltage of RF; V" r 'Considering only the reverse voltage when considering current, V r "The formula for calculating the reverse voltage of RF is obtained by adding the two together, considering only the voltage.
[0051] It is understandable that the calculation of RF forward voltage is as follows: the controller of the main circuit detects the current signal in the detection circuit and calculates the forward voltage considering only the current. This is then added to the voltage signal detected by the sampling circuit when only the voltage is considered. This is the formula for calculating RF forward voltage. Similarly, the calculation of RF reverse voltage is as follows: the controller of the main circuit detects the current signal in the detection circuit and calculates the reverse voltage considering only the current. This is then added to the voltage signal detected by the sampling circuit when only the voltage is considered. This is the formula for calculating RF reverse voltage.
[0052] The aforementioned RF coupler has two iron cores and is bulky. This application proposes an improved coupler that retains the original function of the coupler while replacing the two iron cores with one iron core, which is beneficial for the miniaturization of RF equipment.
[0053] The coupler includes: an iron core, a first wire, a second wire, and a third wire; the first wire passes through the center of the iron core, and the second wire and the third wire are both wound around the iron core, with the winding direction of the second wire and the third wire being the same; the two ends of the first wire passing through the iron core are the radio frequency input terminal and the radio frequency output terminal, and the second wire and the third wire both lead out input pins and output pins.
[0054] The output pin of the second conductor is connected to the input pin of the third conductor and leads out to the center pin.
[0055] It should be noted that the coupler uses a single wire that passes directly through the center of the iron core as the RF input and RF output terminals of the main circuit. The second and third wires are made into two windings, which are wound around an iron core for RF forward and RF reverse voltage detection. Both wires are wound in the same direction (e.g., counterclockwise) along both sides of the iron core. The output pin of the second wire is connected to the input pin of the third wire and leads out to the center pin, ensuring insulation between the three wires. Specifically, the RF output terminal of the first wire is pin 5, the RF input terminal of the first wire is pin 1, the input pin of the second wire is pin 3, and the output pin of the third wire is pin 4. The output pin of the second wire is connected to the input pin of the third wire and leads out to the center pin, which is pin 2.
[0056] In this implementation, a single wire passes directly through the center of the iron core as the RF input and output terminals of the main circuit. The second and third wires are made into two windings, which are then wound around an iron core for RF forward and reverse voltage detection. Both wires are wound in the same direction (e.g., counter-clockwise) along both sides of the iron core. The output pin of the second wire is connected to the input pin of the third wire, and a central pin is led out, ensuring insulation between the three wires. The number of turns of the second and third wires is determined according to specific requirements. This coupler only requires one iron core for RF forward and reverse voltage detection, which is beneficial for device miniaturization.
[0057] This invention also proposes a radio frequency detection circuit, which includes the aforementioned coupler. Figure 3 and Figure 4 This is a module diagram of the first embodiment of the radio frequency detection circuit proposed in this utility model.
[0058] The radio frequency detection circuit includes: a sampling circuit 200 and the aforementioned coupler 100; the sampling circuit 200 is connected to the coupler 100, and the coupler 100 is connected to the radio frequency input terminal 400 and the radio frequency output terminal 500 of the main circuit, respectively; the coupler 100 is used to isolate the radio frequency signal of the main circuit and transmit the radio frequency signal of the main circuit to the sampling circuit 200; the sampling circuit 200 is used to detect the voltage signal in the radio frequency signal.
[0059] It should be noted that the coupler 100 is used to isolate the radio frequency signal of the main circuit to prevent the main circuit from being affected when the detection circuit fails. At the same time, it couples the radio frequency signal of the main circuit from the first wire to the second and third wires. The sampling circuit is connected to the input pin of the second wire and the output pin of the third wire. The sampling circuit receives the radio frequency signal. The sampling circuit acts like a reference resistor. By detecting the voltage signal of the sampling circuit and combining it with the accurate resistance value of the sampling circuit, the radio frequency signal of the main circuit can be calculated by calibration, comparison, or as a reference.
[0060] The radio frequency detection circuit includes: a bias circuit 600; the bias circuit 600 is connected to the input terminal 400 of the main circuit and the coupler 100; the bias circuit 600 is used to stabilize the potential of the coupler and provide a bias voltage to the coupler.
[0061] It should be noted that the bias circuit 600 uses a capacitor to determine the static operating state of the coupler 100. By selecting an appropriate capacitor size, stable operation of the coupler is achieved and the linearity of the detected RF signal is improved. The bias circuit provides a stable bias voltage to the coupler 100, ensuring stable coupling even when the RF signal of the main circuit fluctuates drastically.
[0062] Specifically, the bias circuit 600 is connected to the RF input terminal of the main circuit via feedback to provide a bias voltage to the coupler 100 for adjustment, thereby improving the stability and linearity of the RF signal detected by the main circuit in this application.
[0063] The radio frequency detection circuit includes a voltage divider circuit 700 and a voltage regulator circuit 800; the voltage regulator circuit is connected to the voltage divider circuit 700, and the voltage divider circuit is connected to the sampling circuit and the controller of the main circuit; the voltage divider circuit 700 is used to divide the voltage signal and output the divided voltage signal to the controller in the main circuit; the voltage regulator circuit 800 is used to stabilize the divided voltage signal output by the voltage divider circuit.
[0064] It is understood that the voltage divider circuit and the voltage regulator circuit are connected to the controller of the RF main circuit. The controller of the RF main circuit can be a microcontroller, which is a DC load. To protect the microcontroller, the voltage signal needs to be divided and regulated. The voltage divider circuit divides the voltage signal into the divided voltage signal, which is within the normal operating voltage range of the microcontroller. The voltage regulator circuit can maintain the stability of the divided voltage signal even when there are abnormalities in the RF signal of the main circuit or damage to circuit components.
[0065] In this embodiment, the coupler 100 isolates the radio frequency (RF) signal of the main circuit and couples the RF signal of the main circuit to the second and third wires. The voltage signal in the RF signal is collected by connecting the second and third wires through a sampling circuit. The voltage signal is converted into a voltage divider signal by a voltage divider circuit and a voltage regulator circuit. The voltage divider signal is transmitted to the controller of the main circuit. The controller of the main circuit receives the voltage divider signal and, in combination with the resistance value of the sampling circuit resistor, calculates the RF signal of the main circuit by calibration.
[0066] Figure 5 This is a circuit diagram of the second embodiment of the radio frequency detection circuit proposed in this utility model.
[0067] Based on the first embodiment described above, a second embodiment of the radio frequency detection circuit of this utility model is proposed.
[0068] Pin 1 of the coupler is the RF input terminal, and is connected to the RF input terminal of the bias circuit and the main circuit. Pin 2 of the coupler is the center pin, and is connected to the bias circuit. Pin 3 of the coupler is the input pin of the second wire, and is connected to the sampling circuit. Pin 4 of the coupler is the output pin of the third wire, and is connected to the sampling circuit. Pin 5 of the coupler is the RF output terminal, and is connected to one end of the first capacitor C1 and one end of the second capacitor C2. The other ends of the first capacitor C1 and the second capacitor C2 are connected to the RF output terminal of the main circuit.
[0069] It should be noted that the coupler T3 is equivalent to a mutual inductor. The coupler will cause a 180-degree phase difference between the radio frequency signals of pins 1 and 5 and pins 3 and 4, which are positive and negative voltages respectively. The first capacitor C1 and the second capacitor C2 are used to isolate the non-radio frequency signals of the main circuit.
[0070] It is understood that RF_IN is connected to the RF input terminal of the main circuit, and RF_OUT is connected to the RF output terminal of the main circuit. RF_IN and RF_OUT measure the positive voltage.
[0071] The bias circuit includes a third capacitor C3, a fourth capacitor C4, and a first resistor R1; one end of the third capacitor C3 is connected to the RF input terminal of the main circuit, the other end of the third capacitor is connected to one end of the fourth capacitor C4, one end of the first resistor R1, and pin 2 of the coupler, and the other end of the fourth capacitor C4 and the other end of the first resistor R1 are grounded.
[0072] It should be noted that the first capacitor C1 and the second capacitor C2 provide bias voltage for the coupler.
[0073] The sampling circuit includes: a second resistor R2, a third resistor R3, a fourth resistor R4, and a fifth resistor R5; one end of the second resistor R2 is connected to pin 3 of the coupler 100, the other end of the second resistor R2 is connected to the voltage divider circuit 700, one end of the third resistor R3 and one end of the fourth resistor, the other end of the third resistor R3 is connected to the other end of the fourth resistor R4, the voltage divider circuit and one end of the fifth resistor R5, and the other end of the fifth resistor R5 is connected to pin 4 of the coupler 100.
[0074] It should be noted that the third and fourth resistors are reference resistors, providing an accurate resistance value reference for other parts of the circuit, used for calibration, comparison, or as a benchmark.
[0075] It is understood that REV1 and FWD1 are connected to the controller in the main circuit, and REV1 and FWD1 measure the reverse voltage.
[0076] The voltage divider circuit includes: a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, and a ninth resistor R9; one end of the sixth resistor R6 is connected to the other end of the second resistor R2, one end of the third resistor R3, and one end of the fourth resistor R4; the other end of the sixth resistor R6 is connected to one end of the seventh resistor R7, the controller in the main circuit, and the voltage regulator circuit; one end of the eighth resistor is connected to the other end of the third resistor R3, the other end of the fourth resistor, and one end of the fifth resistor R5; the other end of the eighth resistor R8 is connected to the ninth resistor R9, the controller in the main circuit, and the voltage regulator circuit; and the other ends of the seventh resistor R7 and the ninth resistor R9 are grounded.
[0077] It should be noted that, under ideal conditions, the radio frequency signal and the voltage divider signal detected by the controller in the main circuit are directly proportional.
[0078] The voltage regulator circuit includes: a first Zener diode D1 and a second Zener diode D2. The cathode of the first Zener diode D1 is connected to the controller in the main circuit and the other end of the six-resistor R6. The cathode of the second Zener diode is connected to the controller in the main circuit and the other end of the eight-resistor R8. The anodes of the first Zener diode and the anodes of the second Zener diode are grounded.
[0079] It should be noted that Zener diodes D1 and D2 are used to stabilize the voltage divider signal and prevent the voltage divider signal from becoming too high, which could damage the controller in the main circuit.
[0080] In this embodiment, the main circuit's radio frequency (RF) signal is input from RF_IN and output from RF_OUT. The RF detection circuit couples the RF signal to the sampling circuit via coupler T3. The RF signal is transmitted to the sampling circuit, which detects the voltage signal in the RF signal. The voltage value across reference resistors R3 and R4 is the voltage signal. The voltage signal is transmitted to the controller in the main circuit. To prevent the voltage signal from burning out the controller, the voltage signal is divided by voltage divider resistors R6 and R8 to obtain a divided voltage signal, which is transmitted to the controller. To further protect the controller, Zener diodes D1 and D2 are also added.
[0081] This utility model also proposes a radiofrequency therapy device, which includes a radiofrequency detection circuit. The specific structure of the radiofrequency detection circuit is as described in the above embodiments. Since this radiofrequency therapy device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.
[0082] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.
Claims
1. A coupler, characterized in that, The coupler, used in radio frequency detection circuits, comprises: an iron core, a first wire, a second wire, and a third wire; The first wire passes through the center of the iron core, and the second and third wires are both wound around the iron core, with the second and third wires wound in the same direction. The two ends of the first wire passing through the iron core are the radio frequency input terminal and the radio frequency output terminal, and the second and third wires both lead out input pins and output pins.
2. The coupler as claimed in claim 1, characterized in that, The output pin of the second conductor is connected to the input pin of the third conductor and leads out to the center pin.
3. A radio frequency detection circuit, characterized in that, The radio frequency detection circuit includes: a sampling circuit and a coupler as described in claim 2; The sampling circuit is connected to the coupler, and the coupler is connected to the RF input terminal and the RF output terminal of the main circuit, respectively. The coupler is used to isolate the radio frequency signals of the main circuit and transmit the radio frequency signals of the main circuit to the sampling circuit; The sampling circuit is used to detect the voltage signal in the radio frequency signal.
4. The radio frequency detection circuit as described in claim 3, characterized in that, The radio frequency detection circuit includes: a bias circuit; The bias circuit is connected to the input terminal of the main circuit and the coupler; The bias circuit is used to stabilize the potential of the coupler and provide a bias voltage to the coupler.
5. The radio frequency detection circuit as described in claim 4, characterized in that, The radio frequency detection circuit includes: a voltage divider circuit and a voltage regulator circuit; The voltage regulator circuit is connected to the voltage divider circuit, and the voltage divider circuit is connected to the sampling circuit and the controller of the main circuit. The voltage divider circuit is used to divide the voltage signal and output the divided voltage signal to the controller in the main circuit. The voltage regulator circuit is used to stabilize the voltage divider signal output by the voltage divider circuit.
6. The radio frequency detection circuit as described in claim 5, characterized in that, Pin 1 of the coupler is the RF input terminal, and is connected to the bias circuit and the RF input terminal of the main circuit. Pin 2 of the coupler is the center pin, connected to the bias circuit. Pin 3 of the coupler is the input pin of the second wire, connected to the sampling circuit. Pin 4 of the coupler is the output pin of the third wire, connected to the sampling circuit. Pin 5 of the coupler is the RF output terminal, and is connected to one end of the first capacitor and one end of the second capacitor. The other ends of the first capacitor and the other ends of the second capacitor are connected to the RF output terminal of the main circuit.
7. The radio frequency detection circuit as described in claim 6, characterized in that, The bias circuit includes: a third capacitor, a fourth capacitor, and a first resistor; One end of the third capacitor is connected to the RF input terminal of the main circuit, and the other end of the third capacitor is connected to one end of the fourth capacitor, one end of the first resistor, and pin 2 of the coupler. The other end of the fourth capacitor and the other end of the first resistor are grounded.
8. The radio frequency detection circuit as described in claim 7, characterized in that, The sampling circuit includes: a second resistor, a third resistor, a fourth resistor, and a fifth resistor; One end of the second resistor is connected to pin 3 of the coupler, and the other end of the second resistor is connected to the voltage divider circuit, one end of the third resistor and one end of the fourth resistor. The other end of the third resistor is connected to the other end of the fourth resistor, the voltage divider circuit and one end of the fifth resistor. The other end of the fifth resistor is connected to pin 4 of the coupler.
9. The radio frequency detection circuit as described in claim 8, characterized in that, The voltage divider circuit includes: a sixth resistor, a seventh resistor, an eighth resistor, and a ninth resistor; One end of the sixth resistor is connected to the other end of the second resistor, one end of the third resistor, and one end of the fourth resistor. The other end of the sixth resistor is connected to one end of the seventh resistor, the controller in the main circuit, and the voltage regulator circuit. One end of the eighth resistor is connected to the other end of the third resistor, the other end of the fourth resistor, and one end of the fifth resistor. The other end of the eighth resistor is connected to the ninth resistor, the controller in the main circuit, and the voltage regulator circuit. The other ends of the seventh resistor and the ninth resistor are grounded.
10. A radiofrequency therapy device, characterized in that, The radiofrequency therapy device includes the radiofrequency detection circuit according to any one of claims 1-9.