Radio frequency control method, circuit, apparatus, and device for skin treatment

Abstract

The present application discloses a radio frequency control method, circuit, apparatus, and device for skin treatment, relating to the technical field of radio frequency treatment. The radio frequency control method for skin treatment comprises: when a pilot signal is applied to one of a plurality of target treatment areas, controlling an impedance matching unit to perform impedance matching with the target treatment area; in an impedance matching state, controlling, according to a set power, the output of a radio frequency power supply, and calculating, according to a detection signal, a load power; and calculating a difference between the set power and the load power, and controlling, according to the difference, an output power of the radio frequency power supply, thereby enabling the load power to be maintained at the set power.

Description

Radio frequency control method, circuit, device and equipment for skin treatment

[0001] Related applications

[0002] The present application claims priority to Chinese patent application No. 202411362314.6, filed on September 27, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the field of radio frequency treatment, in particular to a radio frequency control method, circuit, device and equipment for skin treatment. BACKGROUND

[0004] At present, the method for obtaining the load power of the human body treatment area of the existing radio frequency treatment equipment for skin treatment is usually calibrated when the radio frequency equipment is shipped, the corresponding relationship between different powers and radio frequency signals is obtained, and the load power is determined by fitting or interpolation. However, the power accuracy of this method depends on the number of calibration points, and the more calibration points, the higher the accuracy. However, too many calibration points are not convenient for production, and the production efficiency is not high. Moreover, this method cannot determine the actual load power of the treatment area, and the power will decline due to the aging of the equipment, which affects the accuracy of load power detection, so that the actual radio frequency power received by the human body treatment area is inconsistent with the radio frequency output power set by the upper computer, thereby causing the radio frequency treatment equipment to be unable to maintain constant power output at the set power when facing different radio frequency treatment areas.

[0005] Therefore, the existing technology cannot detect the actual load power of the treatment area in real time, which causes the radio frequency treatment equipment to be unable to maintain constant power output at the set power when facing different radio frequency treatment areas, and the equipment production efficiency is not high due to the need for factory calibration. SUMMARY

[0006] The main purpose of the present application is to provide a radio frequency control method, circuit, device and equipment for skin treatment, which aims to solve the problem that the existing technology cannot detect the actual load power of the treatment area in real time, which causes the radio frequency treatment equipment to be unable to maintain constant power output at the set power when facing different radio frequency treatment areas, and the equipment production efficiency is not high due to the need for factory calibration.

[0007] To achieve the above-mentioned purpose, the radio frequency control method for skin treatment provided by the present application is applied to a radio frequency control circuit for skin treatment, which includes an impedance matching unit, a radio frequency power supply and a detection unit, and the method comprises:

[0008] controlling the impedance matching unit to perform impedance matching with the target treatment area when applying a pilot signal to one of the plurality of target treatment areas;

[0009] controlling the output voltage of the radio frequency power supply according to a preset constant power in the impedance matching state, and calculating real-time load power of the target treatment area according to the detection signal of the detection unit;

[0010] adjusting the output voltage of the radio frequency power supply based on the difference between the real-time load power and the preset constant power, so as to maintain constant power output to the target treatment area.

[0011] In an embodiment, the impedance matching unit includes X impedance matching networks arranged in parallel and X relays, and each impedance matching network is arranged in series with a relay, X is greater than or equal to 2, and the step of controlling the impedance matching unit to match the impedance of one of the plurality of target treatment areas includes:

[0012] controlling each of the X relays to close and delay for a preset time, and controlling the matching output voltage of the radio frequency power supply respectively;

[0013] receiving the detection signal of the detection unit, and obtaining the forward peak voltage and the reverse peak voltage of the radio frequency signal according to the detection signal;

[0014] calculating the standing wave ratio of the radio frequency signal when each of the relays is closed according to the forward peak voltage and the reverse peak voltage respectively;

[0015] comparing the size of the standing wave ratio when each relay is closed, and closing the relay corresponding to the minimum standing wave ratio.

[0016] In an embodiment, the step of comparing the size of the standing wave ratio when each relay is closed, and closing the relay corresponding to the minimum standing wave ratio includes:

[0017] comparing the size of the standing wave ratio when each relay is closed, and when there are multiple minimum standing wave ratios, comparing the size of the forward peak voltage corresponding to the multiple minimum standing wave ratios, and closing the relay corresponding to the maximum forward peak voltage.

[0018] In an embodiment, the detection unit includes a directional coupler, the detection signal is the forward peak voltage and the reverse peak voltage detected by the directional coupler coupling the forward electrical signal and the reverse electrical signal of the radio frequency signal as effective values, and the step of calculating the real-time load power of the target treatment area according to the detection signal of the detection unit includes:

[0019] calculating the load impedance of the target treatment area according to the detected forward peak voltage and reverse peak voltage, the load impedance including real impedance and imaginary impedance;

[0020] According to the forward peak voltage and the reverse peak voltage and the real impedance of the load impedance, the real-time load power of the target treatment area is calculated.

[0021] In an embodiment, the step of calculating the real-time load power of the target treatment area according to the forward peak voltage and the reverse peak voltage and the real impedance of the load impedance comprises:

[0022] According to the calculation formula of the load power, the real-time load power of the target treatment area is calculated, and the calculation formula of the load power is:

[0023] Wherein, P L is the load power, R L is the real impedance of the load, V is the vector sum of the forward peak voltage and the reverse peak voltage of the radio frequency signal, V F is the forward peak voltage of the radio frequency signal, V R is the reverse peak voltage of the radio frequency signal, N is the turns ratio of the directional coupler, V f is the forward peak voltage detected by the directional coupler, V r is the reverse peak voltage detected by the directional coupler, γ t is the reflection ratio, γ t = V r / V f , is the phase difference between the phase of the forward peak voltage detected by the directional coupler and the phase of the reverse peak voltage detected by the directional coupler.

[0024] In an embodiment, the radio frequency control circuit for skin treatment further comprises an RF power regulator, the RF power regulator comprises a PID controller and a digital-to-analog converter, and the step of adjusting the output voltage of the radio frequency power supply based on the difference between the real-time load power and the preset constant power to maintain constant power output to the target treatment area comprises:

[0025] According to the set power, a control signal is sent to the digital-to-analog converter, and the difference is sent to the PID controller;

[0026] When the difference is greater than the preset difference, the PID controller sends a PID control signal to the digital-to-analog converter according to the preset PID control parameter;

[0027] When the difference is less than or equal to the preset difference, the PID controller sends a PI control signal to the digital-to-analog converter according to the preset PID control parameter.

[0028] The application further provides a radio frequency control circuit for skin treatment, which is applied to the radio frequency control method as described above, and comprises an impedance matching unit, a radio frequency power supply, a detection unit and a control unit, wherein the control unit is connected with the controlled end of the impedance matching unit, the detection end of the detection unit and the controlled end of the radio frequency power supply respectively, the output end of the radio frequency power supply is connected with the input end of the detection unit, the output end of the detection unit is connected with the input end of the impedance matching unit, and the output end of the impedance matching unit is connected with the electrode of one of the target treatment areas.

[0029] The impedance matching unit is configured to perform impedance matching on the target treatment area under the control of the control unit when a pilot signal is applied to one of the target treatment areas.

[0030] The detection unit is configured to detect the radio frequency signal and output a detection signal to the control unit.

[0031] The control unit is configured to control the impedance matching unit to perform impedance matching on the target treatment area, and under the impedance matching state, control the output voltage of the radio frequency power supply according to a preset constant power, calculate the real-time load power of the target treatment area according to the detection signal of the detection unit, and adjust the output voltage of the radio frequency power supply based on the difference between the real-time load power and the preset constant power, so as to maintain constant power output on the target treatment area.

[0032] The radio frequency power supply is configured to adjust the output voltage under the control of the control unit, so as to maintain constant power output on the target treatment area.

[0033] In an embodiment, the impedance matching unit comprises X impedance matching networks arranged in parallel and X relays, each impedance matching network is arranged in series with a corresponding relay, the controlled end of each relay is connected with the control unit respectively, and X is greater than or equal to 2.

[0034] The application further provides a radio frequency control device for skin treatment, which comprises the radio frequency control circuit for skin treatment as described above.

[0035] The application further provides a radio frequency control device for skin treatment, which comprises a memory, a processor and a computer program stored in the memory and executable on the processor, and the computer program is configured to implement the steps of the radio frequency control method for skin treatment as described in any one of the above embodiments.

[0036] The technical scheme of the present application firstly applies a pilot signal to the target treatment area while the impedance matching unit matches the impedance of the load of the radio frequency treatment area, so that the circuit and the load of the radio frequency treatment area are in an impedance matching state, the reflection of the radio frequency energy output is minimized, and the real-time load power is calculated according to the detection signal in the impedance matching state, without calibration, the load power of the radio frequency treatment area can be accurately calculated. By comparing the difference between the set power and the real-time load power, the output power of the radio frequency power supply is automatically adjusted. This closed-loop control mechanism ensures that the load power can quickly and stably reach the set value when facing different radio frequency treatment areas, thereby improving the accuracy and controllability of the radio frequency output power. In summary, this method can detect the actual load power of the radio frequency treatment area in real time, so that the accuracy of the load power detection is not affected by the aging of the equipment, and the radio frequency treatment equipment can control the load power to maintain constant power output at the set power when facing different radio frequency treatment areas, without factory calibration, and the production efficiency of the equipment is improved. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings shown.

[0038] Fig. 1 is a flowchart of an embodiment of the radio frequency control method for skin treatment provided by the present application;

[0039] Fig. 2 is a flowchart of an embodiment of the radio frequency control method for skin treatment provided by the present application;

[0040] Fig. 3 is a flowchart of an embodiment of the radio frequency control method for skin treatment provided by the present application;

[0041] Fig. 4 is a flowchart of an embodiment of the radio frequency control method for skin treatment provided by the present application;

[0042] Fig. 5 is a flowchart of an embodiment of the radio frequency control method for skin treatment provided by the present application;

[0043] Fig. 6 is a flowchart of an embodiment of the radio frequency control method for skin treatment provided by the present application;

[0044] Fig. 7 is a module structure diagram of an embodiment of the radio frequency control circuit for skin treatment provided by the present application;

[0045] Fig. 8 is a schematic diagram of a module structure of a second embodiment of the RF control circuit for skin treatment according to the present application;

[0046] Fig. 9 is a schematic diagram of a module structure of an implementation of the second embodiment of the RF control circuit for skin treatment according to the present application;

[0047] Fig. 10 is a schematic diagram of a module structure of a third embodiment of the RF control circuit for skin treatment according to the present application;

[0048] Fig. 11 is a schematic diagram of a module structure of a fourth embodiment of the RF control circuit for skin treatment according to the present application;

[0049] Fig. 12 is a schematic diagram of a module structure of a fifth embodiment of the RF control circuit for skin treatment according to the present application;

[0050] Fig. 13 is a schematic diagram of a circuit structure of the fifth embodiment of the RF control circuit for skin treatment according to the present application;

[0051] Fig. 14 is a schematic diagram of a structure of the RF control device for skin treatment according to the present application.

[0052] Brief Description of the Drawings: 10, RF power supply; 20, detection unit; 21, directional coupler; 22, low-pass filter module; 221, first low-pass filter; 222, second low-pass filter; 23, proportional amplifier module; 231, first proportional amplifier; 232, second proportional amplifier; 24, analog-to-digital converter; 30, control unit; 31, processor; 32, RF power regulator; 321, PID controller; 322, digital-to-analog converter; 323, voltage regulator; 40, impedance matching unit; 41-4X, first impedance matching network to Xth impedance matching network; K1-KX, first relay to Xth relay; 50, load power output unit; 1001, processing device; 1002, ROM; 1003, storage device; 1004, RAM; 1005, bus; 1006, I / O interface; 1007, input device; 1008, output device; 1009, communication device.

[0053] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0054] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0055] It should be noted that if the application embodiments involve directionality indication (such as up, down, left, right, front, back, etc.), the directionality indication is only used to explain the relative position relationship, motion condition, etc. between components in a certain posture, and if the certain posture changes, the directionality indication also changes accordingly.

[0056] In addition, if the application embodiments involve "first", "second" and the like, the "first", "second" and the like are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel schemes include A scheme, or B scheme, or A and B schemes are satisfied at the same time. In addition, "multiple" appearing throughout the text means that two or more than two schemes are included. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the protection scope claimed by the present application.

[0057] At present, the existing radio frequency control device for skin treatment obtains the load power method of the human body treatment area. Usually, it is calibrated when the radio frequency equipment is factory, the corresponding relationship of different power and radio frequency signal is obtained, the load power is determined by fitting or interpolation method, but this way the power accuracy depends on the number of calibration points, the more the calibration points, the higher the accuracy, but too many calibration points are not convenient for production, and the production efficiency is not high. Moreover, this way not only cannot determine the actual load power of the treatment area, but also will appear power recession because of the aging of the equipment, which affects the accuracy of load power detection, makes the actual received radio frequency power of the human body treatment area inconsistent with the radio frequency output power set by the upper computer, and leads to that the radio frequency treatment equipment cannot maintain constant power output with the set power when facing different radio frequency treatment areas.

[0058] Therefore, in the prior art, not only the actual load power of the treatment area cannot be detected in real time, which leads to that the radio frequency treatment equipment cannot maintain constant power output with the set power when facing different radio frequency treatment areas, but also the factory calibration is needed, which makes the production efficiency of the equipment not high.

[0059] The application provides a radio frequency control method for skin treatment.

[0060] Referring to FIG. 1, in an embodiment of the present application, the RF control method for skin treatment is applied to an RF control circuit for skin treatment, which comprises an impedance matching unit, an RF power supply and a detection unit, and the method comprises steps S10-S30:

[0061] Step S10, controlling the impedance matching unit to match the impedance with a target treatment area when a pilot signal is applied to one of a plurality of target treatment areas;

[0062] It should be noted that the impedance matching unit can be a circuit composed of a plurality of relays and a plurality of parallelly arranged impedance matching networks, wherein the plurality of impedance matching networks have different impedance parameters, and the more the number of different impedance matching networks, the wider the range of impedance that can be matched. By alternately accessing the circuit to match the impedance with the target RF treatment area, the relays are cut to the impedance matching network closest to the impedance of the target treatment area among the plurality of impedance matching networks. By matching the impedance between the impedance matching unit and the connected target treatment area, the reflection of RF energy is minimized, and the RF energy is maximized to enter the tissue of the target treatment area.

[0063] Step S20, under the impedance matching state, controlling the output voltage of the RF power supply according to a preset constant power, and calculating the real-time load power of the target treatment area according to the detection signal of the detection unit;

[0064] It should be noted that the detection unit can be a directional coupler, and the real-time power can be calculated by the detection signal output by the detection unit and based on the real-time load power calculation formula of the RF treatment area.

[0065] Step S30, based on the difference between the real-time load power and the preset constant power, adjusting the output voltage of the RF power supply to maintain the preset constant power output to the target treatment area.

[0066] It should be noted that the RF power supply comprises an enable end and a controlled end, the opening and closing of the RF power supply are controlled through the enable end of the RF power supply, and the size of the output power of the RF power supply can be adjusted and controlled through the controlled end of the RF power supply. The set power is the power target set by the upper computer, and when the RF treatment load power is constant at the set power, the RF treatment effect can be achieved. The RF treatment load power can be controlled by adjusting the output power of the RF power supply, according to the real-time load power calculated by step S20, the difference between the load power and the set power is calculated, and the output power of the RF power supply is adjusted according to the difference to control the load power, forming a closed-loop control system of the load power, which continuously calculates the real-time load power according to the detection signal and adjusts the load power, to ensure that the load power can be constant at the preset constant power during the entire treatment process.

[0067] In the embodiment, when the radio frequency control for skin treatment is performed, first, the impedance matching unit is controlled to match the impedance with the radio frequency treatment area when a pilot signal is applied to the target treatment area, so as to reduce the reflection of radio frequency energy, so that the radio frequency energy output by the radio frequency power supply can be maximally input to the radio frequency treatment area. After the radio frequency treatment area is in the state of impedance matching, the radio frequency signal in the radio frequency circuit is detected by the detection unit and a detection signal is output. The real-time load power of the radio frequency treatment is calculated according to the detection signal and the radio frequency treatment real-time load power calculation formula. The load power of the radio frequency treatment area can be accurately calculated without calibration, and the load power detection accuracy is not affected by the equipment aging. The radio frequency treatment equipment can control the load power to be the set power to maintain constant power output when facing different radio frequency treatment areas. Therefore, the production efficiency of the equipment is improved.

[0068] Referring to FIG. 2, in a possible implementation, the impedance matching unit includes X impedance matching networks arranged in parallel and X relays, each impedance matching network is arranged in series with a corresponding relay, X is greater than or equal to 2, and step S10 can include steps S11-S14.

[0069] It should be noted that the impedances of different radio frequency treatment target areas are different. The impedances of the radio frequency treatment target areas can be different due to differences between individuals to be treated, or differences between different treatment sites of the same individual, or even differences between different treatment periods of the same individual. If the impedance of the radio frequency control circuit for skin treatment is not matched, radio frequency reflection energy will be generated in the radio frequency circuit. The reflected energy bounces back and forth between the radio frequency power supply and the radio frequency treatment area load, and finally becomes heat energy of the resistance in the transmission line and is radiated to the environment. The reflected energy introduces interference signals that propagate along the transmission line, which seriously affects the quality of the radio frequency signal.

[0070] The relay can be an electromagnetic relay, a solid-state relay or other circuit device that can realize the on-off of the circuit. The present application does not limit this.

[0071] The impedance matching network is an LC series-parallel network composed of capacitance and resistance. A specific impedance matching network is connected to the circuit through the relay control, so as to match the impedance with different loads. The number of impedance matching networks X is at least 2. The more the number of impedance matching networks, the more precise or wider the range of impedance matching, and the longer the time of impedance matching, which increases the treatment time. The number of impedance matching networks should be set according to the actual situation, which is not limited in the application.

[0072] In step S11, one of the X relays is controlled to be closed, and after a preset time, the RF power supply outputs a preset voltage.

[0073] It should be noted that the preset time is the reliable switching time of the relay. After the preset time, it can be ensured that the relay completes the closing action before the RF power supply is turned on. For example, the preset time of the relay is 10 ms. The preset time should be set according to the actual circuit design and the selection of the relay, which is not limited in the application. The pilot voltage is the voltage of the pilot signal used for impedance matching of the RF power supply. By adjusting the control voltage of the RF power supply to a small value (0.5V), the RF power supply outputs a preset voltage, so that the power direction coupler detects the output power of the RF power supply, and the power is not too high to output too much RF energy to the load, which improves the safety factor in the impedance matching process and reduces energy waste.

[0074] In step S12, the detection signal of the detection unit is received, and the forward peak voltage and the reverse peak voltage of the RF signal are obtained according to the detection signal.

[0075] It should be noted that the detection signal is the coupled forward voltage signal and the coupled reverse voltage signal output by the detection unit coupling the forward voltage signal and the reverse voltage signal in the RF signal. The data obtained by sampling the detection signal is placed in at least 128 bytes of data buffer area, and the maximum value in the buffer area is the forward peak voltage and the reverse peak voltage of the RF signal.

[0076] In step S13, the VSWR of the RF signal when each relay is closed is calculated according to the forward peak voltage and the reverse peak voltage.

[0077] As an example, the calculation formula of the VSWR is

[0078] Wherein, γ is the VSWR, rev is the absolute value of the reflection ratio, rev = Vrev / Vfwd, wherein Vrev is the forward peak voltage, and Vfwd is the reverse peak voltage.

[0079] Step S14, comparing the size of the standing wave ratio when each relay is closed, closing the relay corresponding to the minimum standing wave ratio.

[0080] Comparing the size of all the standing wave ratios, determining the relay corresponding to the minimum standing wave ratio, closing the relay corresponding to the minimum standing wave ratio, so that the radio frequency control circuit for skin treatment and the radio frequency treatment area load are in impedance matching state.

[0081] In this embodiment, by setting X LC series parallel impedance matching network and by controlling the relay in series with the impedance matching network, each impedance matching network is connected to the circuit, and by detecting the forward peak voltage and reverse peak voltage when different impedance matching networks are connected to the circuit, the standing wave ratio when different impedance matching networks are connected to the circuit is calculated, and the impedance matching between the circuit and the radio frequency treatment area load is determined according to the standing wave ratio. The circuit can be impedance matched in a wide range by switching the relay, so that the reflection of radio frequency energy is minimized when different radio frequency treatment area loads are connected, the output power of the radio frequency power supply is maximized to load power, reducing radio frequency interference and energy waste, enhancing the radio frequency control effect for skin treatment, and reducing the heating of the resistance in the transmission line, prolonging the service life of the circuit.

[0082] Please refer to Figure 3, in a possible embodiment, step S14 can include step S141:

[0083] Step S141: comparing the size of the standing wave ratio when each relay is closed, when there are multiple minimum standing wave ratios, comparing the size of the forward peak voltage corresponding to the multiple minimum standing wave ratios, closing the relay corresponding to the maximum forward peak voltage.

[0084] In this embodiment, when there are two or more relays corresponding to equal standing wave ratios, the maximum amplitude of the coupled forward electrical signal when each relay is closed is compared, and the relay corresponding to the maximum value is closed, so that the impedance matching process is more accurate, and the output power of the radio frequency power supply can be maximized to load power.

[0085] In addition, in a feasible implementation, when performing impedance matching of the load, the matching is not limited to the closing of a single relay, but can also be performed by the simultaneous closing of multiple relays in combination, and the multiple relays are controlled to form more kinds of impedance matching combination networks. Taking X=3 as an example, in addition to three kinds of impedance matching networks formed by the closing of the first relay, the second relay, and the third relay respectively, there are four kinds of impedance matching networks formed by the simultaneous closing of the first relay and the second relay, the simultaneous closing of the first relay and the third relay, the simultaneous closing of the second relay and the third relay, and the simultaneous closing of the first relay, the second relay, and the third relay. Through the technical solution of the embodiment, more precise and wider range impedance matching can be performed.

[0086] As an example, X is set to 3, the impedance matching unit includes a first impedance matching network, a first relay, a second impedance matching network, a second relay, a third impedance matching network, and a third relay, wherein the skin tissue load impedance of the radio frequency treatment area matched by the first impedance matching network is 35Ω, the skin tissue load impedance matched by the second impedance matching network is 100Ω, and the skin tissue load impedance matched by the third impedance matching network is 150Ω. Exemplarily, the implementation process of impedance matching of the embodiment is as follows:

[0087] Step 1, control one of the first relay, the second relay, and the third relay to close respectively, and after a preset time of 10 ms, control the radio frequency power supply to start, and output a preset voltage of 0.5V to the radio frequency power supply to control the output power of the radio frequency power supply;

[0088] Step 2, sample the coupled forward voltage signal and the coupled reverse voltage signal coupled out by the detection unit from the forward voltage signal and the reverse voltage signal of the radio frequency signal when the first relay, the second relay, and the third relay are closed respectively, to obtain the coupled forward voltage data of the coupled forward voltage signal and the coupled reverse voltage data of the coupled reverse voltage signal when each relay is closed;

[0089] Step 3, obtaining the coupling forward peak voltage and the coupling reverse peak voltage when each of the relays is closed according to the coupling forward voltage data and the coupling reverse voltage data when each of the relays is closed, putting the coupling forward voltage data and the coupling reverse voltage data when each of the relays is closed into a data buffer BUF with a size of at least 128 bytes respectively, and obtaining the maximum value in the data buffer BUF as the voltage peak value, calculating the first standing wave ratio SWR1 according to the coupling forward peak voltage Vfwd1 and the coupling reverse peak voltage Vrev1 when the first relay is closed, calculating the second standing wave ratio SWR2 according to the coupling forward peak voltage Vfwd2 and the coupling reverse peak voltage Vrev2 when the second relay is closed, and calculating the third standing wave ratio SWR3 according to the coupling forward peak voltage Vfwd3 and the coupling reverse peak voltage Vrev3 when the third relay is closed;

[0090] Step 4, comparing the first standing wave ratio SWR1, the second standing wave ratio SWR2 and the third standing wave ratio SWR3, and if there is no multiple minimum standing wave ratios, closing the relay corresponding to the minimum standing wave ratio and closing the radio frequency power supply.

[0091] Step 5, if there are multiple minimum standing wave ratios, comparing the coupling forward peak voltages corresponding to the multiple minimum standing wave ratios, closing the relay corresponding to the maximum coupling forward peak voltage, and closing the radio frequency power supply.

[0092] It should be noted that the above examples are only used for understanding the present application and do not constitute a limitation on the radio frequency control method for skin treatment of the present application, and more forms of simple transformation based on this technical concept are within the protection scope of the present application.

[0093] Please refer to FIG. 4, in a possible implementation, the detection unit includes a directional coupler, the detection signal is the forward peak voltage and the reverse peak voltage detected by the directional coupler coupling the forward electrical signal and the reverse electrical signal of the radio frequency signal as the effective value, and the step S20 includes steps S21-S23.

[0094] It should be noted that the electrical signal mentioned in the present application is a voltage signal, and the directional coupler can couple the radio frequency electrical signal of the transmission line between the radio frequency power supply and the radio frequency treatment load according to the turns ratio, and output the coupling forward electrical signal and the coupling reverse electrical signal respectively.

[0095] Firstly, the forward voltage data and the reverse voltage data are obtained by sampling the coupled forward electric signal and the coupled reverse electric signal at a sampling frequency, and the sampled forward voltage data and the reverse voltage data are respectively placed in a data buffer area with at least 128 bytes, and the maximum value in the data buffer area is obtained as the maximum amplitude of the coupled forward electric signal and the maximum amplitude of the coupled reverse electric signal. The maximum amplitude of the coupled forward electric signal is the amplitude of the forward peak voltage, and the maximum amplitude of the coupled reverse electric signal is the amplitude of the reverse peak voltage.

[0096] Then, the coupled forward electric signal and the coupled reverse electric signal are signal-processed, which can be fast Fourier transform processing, to obtain the amplitude spectrum and the phase spectrum of the coupled forward electric signal and the coupled reverse electric signal, respectively. The fundamental frequency is obtained according to the frequency corresponding to the maximum amplitude of the direct current component in the amplitude spectrum, and the frequency resolution of the fast Fourier transform can be obtained according to the ratio of the sampling frequency to the byte number of the data buffer area. The index number of the phase spectrum can be obtained according to the ratio of the fundamental frequency to the frequency resolution, and the phase of the forward peak voltage and the phase of the reverse peak voltage can be obtained by searching the coupled forward electric signal phase spectrum and the coupled reverse electric signal phase spectrum according to the index number, respectively.

[0097] Therefore, the detection signal is the forward peak voltage and the reverse peak voltage detected by the directional coupler when coupling the forward electric signal and the reverse electric signal of the radio frequency signal, which are taken as the effective values. The forward peak voltage can represent the radio frequency energy flowing from the radio frequency power supply to the treatment area during radio frequency treatment, and the reverse peak voltage can represent the radio frequency energy lost during radio frequency treatment (reflected back and forth between the input end of the receiver and the output end of the transmitter, and finally consumed in the form of resistance heating).

[0098] Step S21: calculating the load impedance of the target treatment area according to the detected forward peak voltage and reverse peak voltage, wherein the load impedance includes real impedance and imaginary impedance.

[0099] It should be noted that the phase difference between the forward peak voltage and the reverse peak voltage, the phase and the amplitude of the forward peak voltage and the reverse peak voltage detected by the directional coupler can obtain the reflection coefficient of the radio frequency signal.

[0100] As an example, the calculation formula of the reflection coefficient is as follows:

[0101] Wherein, Γ is the reflection coefficient, Vrev is the amplitude of the forward peak voltage detected by the directional coupler, Vfwd is the amplitude of the reverse peak voltage detected by the directional coupler, is the phase difference between the forward peak voltage and the reverse peak voltage detected by the directional coupler.

[0102] According to the reflection ratio and the source impedance of the radio frequency control circuit for skin treatment, the real-time load impedance of the radio frequency treatment area can be calculated.

[0103] As an example, the impedance calculation formula of the load is as follows:

[0104] Wherein, Γ is the reflection ratio, Z0 is the source impedance of the radio frequency control circuit for skin treatment (standard impedance of 50 ohms), Z L is the load impedance, R L is the real impedance of the load, and Zi is the imaginary impedance of the load.

[0105] Step S22: According to the forward peak voltage and the reverse peak voltage and the real impedance of the load impedance, the real-time load power of the target treatment area is calculated;

[0106] It should be noted that the real-time load power of the radio frequency treatment area can be calculated by the amplitude and phase of the forward peak voltage and the reverse peak voltage and the real-time load impedance, and the real-time load impedance can be calculated by the amplitude and phase of the coupled forward electric signal and the coupled reverse electric signal. Therefore, the load power can be regarded as a function of the forward peak voltage and the reverse peak voltage, reflecting the change trend of the real-time load power.

[0107] Please refer to FIG. 5, in a possible implementation, step S22 can include step S221:

[0108] Step S221, based on the calculation formula of the load power, the real-time load power of the target treatment area is calculated, and the calculation formula of the load power is:

[0109] Wherein, P L is the load power, R L is the real impedance of the load, V is the vector sum of the forward peak voltage and the reverse peak voltage of the radio frequency signal, V F is the forward peak voltage of the radio frequency signal, V R is the reverse peak voltage of the radio frequency signal, N is the turns ratio of the directional coupler, V f is the forward peak voltage detected by the directional coupler, V r is the reverse peak voltage detected by the directional coupler, γ t is the reflection ratio, γ t = V r / V f , is the phase difference between the phase of the forward peak voltage detected by the directional coupler and the phase of the reverse peak voltage detected by the directional coupler.

[0110] It should be noted that the load power P L The vector sum of the forward peak voltage and the reverse peak voltage of the RF signal can represent the RF energy actually received by the RF treatment region during the treatment process. Then, there is

[0111] The directional coupler proportionally couples the forward peak voltage and the reverse peak voltage of the RF signal according to the turns ratio N to obtain the forward peak voltage and the reverse peak voltage detected by the directional coupler. The directional coupler couples the forward peak voltage and the reverse peak voltage in opposite transmission directions in the RF electrical signal into the forward peak voltage and the reverse peak voltage detected by the directional coupler in the same transmission direction. Then, there is

[0112] According to the above formula, there is

[0113] The ratio of the amplitudes of the reverse peak voltage and the forward peak voltage detected by the directional coupler is equal to the ratio of the amplitudes of the reverse peak voltage and the forward peak voltage of the RF signal. Therefore, according to the ratio of the amplitudes of the reverse peak voltage and the forward peak voltage detected by the directional coupler, the absolute value of the reflection coefficient of the RF signal can be obtained. As an example, the absolute value of the reflection coefficient is calculated as follows:

[0114] According to the above formula, further, according to the amplitude of the forward peak voltage detected by the directional coupler, the phase difference between the forward peak voltage and the reverse peak voltage detected by the directional coupler, and the absolute value of the reflection coefficient, the real-time load power of the RF treatment region can be obtained. As an example, the calculation formula of the real-time load power is as follows:

[0115] Exemplarily, when the input voltage of the controlled end of the RF power supply is 0.79V, the results of three groups of data obtained by power calculation through the power calculation formula of the present embodiment are as follows:

[0116] Wherein, the forward voltage and the reverse voltage are the maximum amplitudes of the coupled forward electrical signal and the coupled reverse electrical signal in the present embodiment, respectively. DAC=0.79V

[0117] Amplitude, phase angle is the phase difference between forward voltage and reverse voltage, calculated load impedance is the load impedance calculated by forward voltage, reverse voltage and phase angle, actual network impedance is the actual load impedance measured by network analyzer, measured load power is the measured value of load power, formula calculated power is the value of load power calculated by load power algorithm formula in the embodiment, power accuracy is the ratio of formula calculated power to measured load power, which is used to represent the accuracy of formula calculated power. Through the above data, it can be known that the power accuracy of the load power calculated by the load power algorithm formula in the embodiment is high, and the power situation of the actual load can be accurately reflected.

[0118] Referring to FIG. 6, in a possible implementation, the RF control circuit for skin treatment further includes an RF power regulator, the RF power regulator includes a PID controller and a digital-to-analog converter, and step S30 can include steps S31-S33.

[0119] In step S31, a control signal is sent to the digital-to-analog converter according to the set power, and the difference value is sent to the PID controller.

[0120] It should be noted that the RF control circuit for skin treatment first sends an initial control signal to the digital-to-analog converter according to the power value set by the user through the host computer. The control signal is used to control the digital-to-analog converter to output a preset voltage value, and the voltage value output by the digital-to-analog converter can control the output power of the RF power supply.

[0121] In step S32, when the difference value is greater than the preset difference value, the PID controller is controlled to send a PID control signal to the digital-to-analog converter according to the preset PID control parameters.

[0122] It should be noted that when the difference between the load power and the set power is greater than the preset difference threshold, it indicates that there is a large deviation between the current load power and the set power, and stronger control action is needed to quickly reduce the deviation. At this time, the system will control the PID controller according to the preset PID control parameters (including proportional coefficient, integral coefficient, differential coefficient and sampling period) to send a PID control signal to the digital-to-analog converter according to the deviation. PID control combines proportional, integral and differential control strategies, and can more quickly and accurately adjust the system state. For example, the calculation formula of the PID control signal is as follows:

[0123] Wherein, k is the sampling number, u k is the output value of the PID controller at the kth sampling time, e k is the difference between the load power and the set power at the kth sampling time, e k-1is the difference between the load power and the set power at the k-1th sampling time, Kp is a proportional coefficient, T is a sampling period, Ti is an integral coefficient, and Td is a differential coefficient.

[0124] At step S33, when the difference is less than or equal to a preset difference, the PID controller is controlled to send a PI control signal to the digital-to-analog converter according to a preset PID control parameter.

[0125] It should be noted that when the difference is less than or equal to the preset difference, it indicates that the current load power has approached the set power, and at this time, a strong control action is not needed to avoid system oscillation. Instead, the system uses PI control (only including proportional and integral control) to send a PI control signal to the digital-to-analog converter. The PI control is more stable than the PID control, and is suitable for fine tuning when the system approaches the target state.

[0126] In this embodiment, the PID control signal or the PI control signal is a compensation signal output by the PID controller according to the deviation between the load power and the set power, which is used to control the output voltage of the digital-to-analog converter together with the initial control signal, so as to dynamically adjust the voltage value of the digital-to-analog converter, adjust the output power of the radio frequency power supply, and then adjust the load power, so that the load power dynamically approaches the set power. The whole process is a closed-loop control process. By continuously monitoring the load power, calculating the deviation, and adjusting the control signal accordingly, the output power of the radio frequency power supply is adjusted, and then the difference between the load power and the set power is ensured to be less than 20% of the set power. This control method has high flexibility and accuracy, and can realize constant power output under various load conditions.

[0127] In summary, the technical scheme of the present application firstly matches the impedance of the radio frequency treatment area load through the impedance matching unit, so that the circuit can perform wide-range impedance matching through the switching relay, thereby enabling the radio frequency control circuit and the radio frequency treatment area load to be in an impedance matching state when accessing different radio frequency treatment area loads, at which time the reflection of radio frequency energy is minimized and the output power of the radio frequency power supply is maximally converted into load power. Then, the forward electrical signal and the reverse electrical signal of the radio frequency electrical signal are coupled through the directional coupler in the impedance matching state to obtain the forward peak voltage and the reverse peak voltage detected by the directional coupler. The amplitude and phase of the forward peak voltage and the reverse peak voltage detected by the directional coupler can be used to obtain the load impedance of the radio frequency treatment area in real time. According to the amplitude and phase of the forward peak voltage and the reverse peak voltage detected by the directional coupler and the real-time load impedance, the real-time load power of the radio frequency treatment area can be accurately calculated without being affected by the aging of the equipment and without the need for calibration through the calculation formula of the real-time load power in the present application. By comparing the difference between the set power and the real-time calculated load power, the output power of the radio frequency power supply is automatically adjusted. This closed-loop control mechanism ensures that the load power can be controlled to maintain constant power output at the set power when facing different radio frequency treatment areas, thereby improving the accuracy and controllability of the radio frequency output power. Moreover, there is no need for factory calibration, thereby reducing production costs, reducing the risk of incorrect calibration data by production line technicians, and improving equipment production efficiency.

[0128] In addition, the technical scheme of the present embodiment can also perform self-fault diagnosis through real-time monitoring of the load power. The change trend of the load power during the treatment process is detected in real time. Abnormal power fluctuation may be a precursor of equipment failure. By comparing the actual load power with the expected value, potential problems can be quickly identified. When a fault is detected, the radio frequency energy is immediately turned off, and the host computer is timely reported, which is helpful for troubleshooting and maintenance.

[0129] Referring to FIG. 7, the present application also proposes a radio frequency control circuit for skin treatment, which is applied to the radio frequency control method for skin treatment described above. In the first embodiment of the radio frequency control circuit for skin treatment of the present application, the radio frequency control circuit for skin treatment comprises an impedance matching unit 40, a radio frequency power supply 10, a detection unit 20, and a control unit 30. The control unit 30 is connected to the controlled end of the impedance matching unit 40, the detection end of the detection unit 20, and the controlled end of the radio frequency power supply 10, respectively. The output end of the radio frequency power supply 10 is connected to the input end of the detection unit 20. The output end of the detection unit 20 is connected to the input end of the impedance matching unit 40. The output end of the impedance matching unit 40 is connected to the electrodes of one of a plurality of target treatment areas. Wherein,

[0130] The impedance matching unit 40 is configured to perform impedance matching with the target treatment area under the control of the control unit 30 when applying the pilot signal to one of the multiple target treatment areas.

[0131] The detection unit 20 is configured to detect the radio frequency signal and output a detection signal to the control unit 30.

[0132] The control unit 30 is configured to control the impedance matching unit 40 to perform impedance matching with the target treatment area, in the state of impedance matching, control the radio frequency power supply 10 to output power according to a preset constant power, calculate real-time load power of the target treatment area according to the detection signal of the detection unit 20, and adjust the output voltage of the radio frequency power supply 10 based on the difference between the real-time load power and the preset constant power, so as to maintain constant power output to the target treatment area.

[0133] The radio frequency power supply 10 is configured to adjust the output voltage under the control of the control unit 30, so as to maintain constant power output to the target treatment area.

[0134] It should be noted that the impedance matching unit 40 can be a circuit composed of multiple parallel LC impedance matching networks and relays, which is controlled by the control unit 30 to perform impedance matching with different radio frequency treatment area loads. The detection unit 20 is composed of a directional coupler 21, which is a directional power coupling element that can couple part of the input signal power to another port, can distinguish the main transmission direction and the reflection direction of the signal, and can output in different ports. It is used for coupling forward voltage signal and reverse voltage signal of radio frequency signal, and transmitting the obtained coupled forward voltage signal and coupled reverse voltage signal to the processor 31.

[0135] The control unit 30 is composed of a processor 31, which can be an MCU (Microcontroller Unit) chip, an FPGA (Field-Programmable Gate Array) chip, an STM32 chip, an STM chip, an ARM (Advanced RISC Machines) chip, etc. The processor 31 is connected with the upper computer, and receives the set power value from the upper computer.

[0136] The radio frequency power supply 10 is a power supply device capable of generating a sine wave voltage of a fixed frequency, is turned on or off by accepting the control of the processor 31 through an enable end, and adjusts power by receiving a control voltage through a controlled end; the radio frequency power supply 10 can be a transistor radio frequency power supply or a tube radio frequency power supply, and the embodiment does not make specific limitation.

[0137] The radio frequency control circuit for skin treatment provided in the application adopts the radio frequency control method for skin treatment in the above embodiment, and can solve the problem in the prior art that not only the actual load power of the treated area cannot be detected in real time, but also the radio frequency treatment device cannot maintain constant power output at the set power when facing different radio frequency treatment areas, and factory calibration is needed, which is not high in device production efficiency. Compared with the prior art, the radio frequency control circuit for skin treatment provided in the application has the same beneficial effects as the radio frequency control method for skin treatment provided in the above embodiment, and other technical features in the radio frequency control circuit for skin treatment are the same as the features disclosed in the above embodiment method, which will not be repeated here.

[0138] Based on the first embodiment of the radio frequency control circuit for skin treatment, in the second embodiment of the radio frequency control circuit for skin treatment of the application, please refer to FIGS. 8 and 9, the control unit 30 further comprises an RF power regulator 32, and the RF power regulator 32 comprises:

[0139] A PID controller 321, an input end of the PID controller 321 is connected with the processor 31, for receiving the difference and outputting a compensation signal according to the difference;

[0140] A digital-to-analog converter 322, input ends of the digital-to-analog converter 322 are respectively connected with output ends of the processor 31 and the PID controller 321, for receiving a control signal output by the processor 31 and a compensation signal output by the PID controller 321, and outputting a power regulation signal according to the control signal and the compensation signal;

[0141] A voltage regulator 323, an input end of the voltage regulator 323 is connected with an output end of the digital-to-analog converter 322, and an output end of the voltage regulator 323 is connected with a controlled end of the radio frequency power supply 10, for receiving the power regulation signal, performing proportional amplification on the power regulation signal, and outputting to the radio frequency power supply 10, so as to control the output power of the radio frequency power supply 10.

[0142] It should be noted that the PID controller 321 (Proportional-Integral-Derivative Controller) is a feedback loop component widely used in industrial control, which realizes accurate control of the system by adjusting parameters (Kp, Ki, Kd). In this embodiment, the PID controller 321 receives the difference between the load power and the set power input by the processor 31, then calculates the output value of the compensation signal according to the difference between the load power and the set power, and adjusts the output value of the digital-to-analog converter 322 through the compensation signal, so as to dynamically adjust the power of the radio frequency power supply 10, thereby controlling the real-time load power to maintain at the preset constant power.

[0143] The digital-to-analog converter 322 can be a parallel digital-to-analog converter, a flash digital-to-analog converter, a successive approximation digital-to-analog converter, etc. In this embodiment, the digital-to-analog converter 322 converts the control signal output by the processor 31 and the compensation signal output by the PID controller 321 into an analog voltage signal, which is output to the radio frequency power supply 10 through the voltage regulator 323, so as to dynamically adjust the output power of the radio frequency power supply 10.

[0144] The voltage regulator 323 can be an isolation voltage regulator, an inductive voltage regulator, a thyristor voltage regulator, etc. In this embodiment, the voltage regulator 323 receives the voltage output by the digital-to-analog converter 322 and converts it into a control voltage suitable for the radio frequency power supply 10, and can also stabilize the voltage, ensuring that the radio frequency power supply 10 can work under stable control voltage, thereby improving the stability and accuracy of power control.

[0145] Based on the first embodiment of the radio frequency control circuit for skin treatment described above, in the third embodiment of the radio frequency control circuit for skin treatment of the present application, please refer to FIG. 10, the impedance matching unit 40 includes X parallelly arranged impedance matching networks and X relays, and each impedance matching network is arranged in series with a relay, and the controlled end of each relay is connected with the control unit 30 respectively, and X is greater than or equal to 2;

[0146] The radio frequency control circuit for skin treatment further includes a load power output circuit 50, the output end of the impedance matching unit 40 is connected with the input end of the load power output circuit 50, the output end of the load power output circuit 50 is connected with the radio frequency treatment load, and the load power output circuit 50 is used for outputting radio frequency energy to the radio frequency treatment load.

[0147] It should be noted that the relay can be an electromagnetic relay, a solid-state relay, or other circuit device for realizing circuit on-off, and the embodiment does not make specific limitation on this. The impedance matching unit 40 includes a first impedance matching network 41 to an Xth impedance matching network 4X, and a first relay K1 to an Xth relay KX.

[0148] The load power output circuit 50 is in direct contact with the tissue of the radiofrequency treatment area and is configured to output load power to the tissue of the radiofrequency treatment area. The load power output circuit 50 is a combination of the positive treatment electrode and the negative treatment electrode, which is connected to the radiofrequency treatment area, receives the radiofrequency electrical signal emitted by the radiofrequency power supply 10, and outputs load power to the radiofrequency treatment area. Part of the radiofrequency electrical signal is lost in the transmission process due to reflection.

[0149] Compared with the prior art, the impedance matching unit 40 in the radiofrequency control circuit for skin treatment provided in the application has the same beneficial effects as the radiofrequency control method for skin treatment provided in the above embodiments, and the other technical features of the impedance matching unit 40 in the radiofrequency control circuit for skin treatment are the same as the features disclosed in the radiofrequency control method for skin treatment in the above embodiments, which will not be repeated here.

[0150] Based on the first embodiment of the radiofrequency control circuit for skin treatment, the directional coupler 21 includes an input end, an output end, a forward coupling end, and a reverse coupling end, and the detection signal includes a coupled forward electrical signal and a coupled reverse electrical signal. In the fourth embodiment of the radiofrequency control circuit for skin treatment provided in the application, please refer to FIG. 11, the detection unit 20 further includes:

[0151] The low-pass filter module 22 includes a first low-pass filter 221 and a second low-pass filter 222. The input end of the first low-pass filter 221 is connected to the forward coupling end of the directional coupler 21, configured to filter high-frequency noise of the coupled forward electrical signal. The second low-pass filter 222 is connected to the reverse coupling end of the directional coupler 21, configured to filter high-frequency noise of the coupled reverse electrical signal.

[0152] The proportional amplifier module 23 includes a first proportional amplifier 231 and a second proportional amplifier 232. The input end of the first proportional amplifier 231 is connected to the output end of the first low-pass filter 221, configured to proportionally amplify the coupled forward electrical signal output by the first low-pass filter 221. The second proportional amplifier 232 is connected to the output end of the second low-pass filter 222, configured to proportionally amplify the coupled reverse electrical signal output by the second low-pass filter 222.

[0153] An analog-to-digital converter 24, a first input end of the analog-to-digital converter 24 is connected with the first output end of the directional coupler 21, a second input end of the analog-to-digital converter 24 is connected with the second output end of the directional coupler 21, the first input end and the second input end of the analog-to-digital converter 24 are connected with the processor 31 respectively, for converting the coupled forward voltage signal and the coupled reverse voltage signal into digital signals respectively and outputting to the processor 31 respectively.

[0154] It should be noted that the low-pass filter is an electronic filtering device that allows signals below the cutoff frequency to pass through, but signals above the cutoff frequency cannot pass through. In the embodiment, the coupled forward voltage signal and the coupled reverse voltage signal are filtered by the low-pass filter module 22 to filter out high-frequency noise in the coupled forward voltage signal and the coupled reverse voltage signal, so as to output the coupled forward voltage signal and the coupled reverse voltage signal filtered out of high-frequency noise to the processor 31. When the processor 31 calculates the load power of radio frequency treatment, the influence of high-frequency noise on the calculation result of load power can be avoided, thereby further improving the accuracy of radio frequency treatment load power detection.

[0155] In the embodiment, the coupled forward voltage signal and the coupled reverse voltage signal need to be amplified by the proportional amplification module 23 so that the processor 31 can identify and meet the processing requirements of the processor 31.

[0156] The analog-to-digital converter 24 is an electronic device for converting analog signals into digital signals. In the embodiment, the analog-to-digital converter 24 can be a high-speed analog-to-digital converter. The coupled forward voltage signal and the coupled reverse voltage signal are converted from continuous analog signals into discrete digital signals to facilitate processing, storage and transmission by the processor 31. The high-speed analog-to-digital converter can convert analog signals into digital signals in a short time, respond to signal changes in time and transmit signals to the processor 31, so that the processor 31 can detect load power in real time and dynamically adjust load power to approximate the set power.

[0157] Based on the first embodiment, the second embodiment, the third embodiment and / or the fourth embodiment of the radio frequency control circuit for skin treatment, in the fifth embodiment of the radio frequency control circuit for skin treatment of the present application, the radio frequency control circuit for skin treatment has all the technical features of the above-mentioned embodiments of the radio frequency control circuit for skin treatment. The module structure of the radio frequency control circuit for skin treatment can be the structure shown in FIG. 12.

[0158] As an example, the processor 31 is selected as an MCU, the load power output circuit 50 is selected as the treatment electrode + and the treatment electrode -, the impedance matching unit 40 is selected as the relay 1, the relay 2, the relay 3, the LC series-parallel matching network 1, the LC series-parallel matching network 2 and the LC series-parallel matching network 3, and the digital-to-analog converter 322 is selected as a high-speed digital-to-analog converter. A circuit structure diagram of the radio frequency control circuit for skin treatment as shown in FIG. 13 can be obtained.

[0159] The present application also provides a radio frequency control device for skin treatment, which comprises the radio frequency control circuit for skin treatment as described above.

[0160] The radio frequency control device for skin treatment provided by the embodiments of the present application can solve the problem in the prior art that the actual load power of the treated area cannot be detected in real time, so that the radio frequency treatment device cannot maintain constant power output at the set power when facing different radio frequency treatment areas, and factory calibration is required, which is not high in production efficiency. Compared with the prior art, the radio frequency control device for skin treatment provided by the embodiments of the present application has the same beneficial effects as the radio frequency control circuit for skin treatment provided by the above-mentioned embodiments, which will not be described here again.

[0161] The present application provides a radio frequency control device for skin treatment, which comprises at least one processor and a memory in communication connection with the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the radio frequency control method for skin treatment in the above-mentioned embodiments.

[0162] Reference will now be made to FIG. 14, which shows a structural diagram of a radio frequency control device for skin treatment suitable for implementing the embodiments of the present application. The radio frequency control device for skin treatment in the embodiments of the present application can include, but is not limited to, mobile terminals such as mobile phones, notebook computers, digital broadcast receivers, PDAs (Personal Digital Assistant), PADs (Portable Application Description), PMPs (Portable Media Player), vehicle-mounted terminals (such as vehicle-mounted navigation terminals) and the like, and fixed terminals such as digital TVs, desktop computers and the like. The radio frequency control device for skin treatment shown in FIG. 14 is only an example, and should not bring any limitation to the functions and use range of the embodiments of the present application.

[0163] As shown in FIG. 14, the radio frequency control device for skin treatment can include a processing device 1001 (e.g., a central processing unit, a graphics processing unit, etc.) that can perform various appropriate actions and processes according to a program stored in a read only memory (ROM) 1002 or a program loaded from a storage device 1003 into a random access memory (RAM) 1004. In the RAM 1004, various programs and data required for the operation of the radio frequency control device for skin treatment are also stored. The processing device 1001, the ROM 1002, and the RAM 1004 are connected to each other through a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Generally, the following systems can be connected to the I / O interface 1006: an input device 1007 including, for example, a touch screen, a touch pad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 1008 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; the storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 can allow the radio frequency control device for skin treatment to communicate with other devices wirelessly or by wire to exchange data. Although the radio frequency control device for skin treatment with various systems is shown in the figure, it should be understood that all the shown systems are not required to be implemented or possessed. More or less systems can be alternatively implemented or possessed.

[0164] According to embodiments disclosed in the present application, the processes described above with reference to the flowcharts can be implemented as a computer software program. For example, embodiments disclosed in the present application include a computer program product comprising a computer program carried on a computer readable medium, the computer program containing program codes for executing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network through the communication device, or installed from the storage device 1003, or installed from the ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the methods of the embodiments disclosed in the present application are performed.

[0165] The radio frequency control device for skin treatment provided in the present application adopts the radio frequency control method for skin treatment in the above-mentioned embodiments, and can solve the technical problem of radio frequency treatment control. Compared with the prior art, the radio frequency control device for skin treatment provided in the present application has the same beneficial effects as the radio frequency control method for skin treatment provided in the above-mentioned embodiments, and other technical features in the radio frequency control device for skin treatment are the same as the features disclosed in the previous embodiment method, which will not be described here.

[0166] It should be understood that portions of the application disclosed can be implemented in hardware, software, firmware, or combinations thereof. In the description of the embodiments above, specific features, structures, materials or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0167] The above description is only some embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

[0168] The above is only some embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent processing scope of the present application.

Claims

1. A radio frequency control method for skin treatment, wherein, The method is applied to a radio frequency control circuit for skin treatment, the radio frequency control circuit for skin treatment comprising an impedance matching unit, a radio frequency power supply and a detection unit, and the method comprising: controlling the impedance matching unit to match the impedance with a target treatment area when a pilot signal is applied to one of a plurality of target treatment areas; controlling the output voltage of the radio frequency power supply according to a preset constant power in the state of impedance matching, calculating the real-time load power of the target treatment area according to the detection signal of the detection unit; adjusting the output voltage of the radio frequency power supply based on the difference between the real-time load power and the preset constant power, so as to maintain the preset constant power output for the target treatment area.

2. The method of claim 1, wherein, The impedance matching unit comprises X impedance matching networks arranged in parallel and X relays, and each impedance matching network is arranged in series with a relay, X is greater than or equal to 2, and the step of controlling the impedance matching unit to match the impedance with the target treatment area when a pilot signal is applied to one of a plurality of target treatment areas comprises: controlling each of the X relays to close and delay for a preset time respectively, and controlling the matching output voltage of the radio frequency power supply respectively; receiving the detection signal of the detection unit, and obtaining the forward peak voltage and the reverse peak voltage of the radio frequency signal according to the detection signal; calculating the standing wave ratio of the radio frequency signal when each of the relays is closed according to the forward peak voltage and the reverse peak voltage respectively; comparing the sizes of the standing wave ratios when each of the relays is closed, and closing the relay corresponding to the minimum standing wave ratio.

3. The method of claim 2, wherein, The step of comparing the sizes of the standing wave ratios when each of the relays is closed, and closing the relay corresponding to the minimum standing wave ratio comprises: comparing the sizes of the standing wave ratios when each of the relays is closed, and when there are multiple minimum standing wave ratios, comparing the sizes of the forward peak voltages corresponding to the multiple minimum standing wave ratios, and closing the relay corresponding to the maximum forward peak voltage.

4. The method of claim 1, wherein, The detection unit comprises a directional coupler, the detection signal is the forward peak voltage and the reverse peak voltage detected by the directional coupler coupling the forward electric signal and the reverse electric signal of the radio frequency signal as the effective value, and the step of calculating the real-time load power of the target treatment area according to the detection signal of the detection unit comprises: calculating the load impedance of the target treatment area according to the detected forward peak voltage and reverse peak voltage, the load impedance comprising real impedance and imaginary impedance; calculating the real-time load power of the target treatment area according to the forward peak voltage, the reverse peak voltage and the real impedance of the load impedance.

5. The method of claim 4, wherein, The step of calculating the real-time load power of the target treatment area according to the forward peak voltage, the reverse peak voltage and the real impedance of the load impedance comprises: calculating a real-time load power of the target treatment zone based on a load power calculation formula, the load power calculation formula being: Among them, P L R is the load power. L Let V be the load real impedance, and V be the vector sum of the forward and reverse peak voltages of the RF signal. F V is the positive peak voltage of the radio frequency signal. R V is the reverse peak voltage of the radio frequency signal, N is the turns ratio of the directional coupler, and V f V is the forward peak voltage detected by the directional coupler. r The reverse peak voltage detected by the directional coupler, γ t For reflectance, γ t =V r / V f , the phase difference between the phase of the forward peak voltage detected by the directional coupler and the phase of the reverse peak voltage detected by the directional coupler.

6. The method of claim 1, wherein, The radio frequency control circuit for skin treatment further comprises an RF power regulator comprising a PID controller and a digital-to-analog converter, and the step of adjusting the output voltage of the radio frequency power supply based on the difference between the real-time load power and the preset constant power to maintain constant power output for the target treatment area comprises: sending a control signal to the digital-to-analog converter according to the set power and sending the difference to the PID controller; when the difference is greater than a preset difference, controlling the PID controller to send a PID control signal to the digital-to-analog converter according to preset PID control parameters; when the difference is less than or equal to the preset difference, controlling the PID controller to send a PI control signal to the digital-to-analog converter according to preset PID control parameters.

7. A radio frequency control circuit for skin treatment, wherein, The radio frequency control circuit for skin treatment is applied to the radio frequency control method for skin treatment according to any one of claims 1 to 6, and the radio frequency control circuit comprises an impedance matching unit, a radio frequency power supply, a detection unit, and a control unit, the control unit is connected with a controlled end of the impedance matching unit, a detection end of the detection unit, and a controlled end of the radio frequency power supply respectively, an output end of the radio frequency power supply is connected with an input end of the detection unit, an output end of the detection unit is connected with an input end of the impedance matching unit, and an output end of the impedance matching unit is connected with an electrode of one of a plurality of target treatment areas; wherein the impedance matching unit is configured to perform impedance matching on the target treatment area under the control of the control unit when a pilot signal is applied to one of the plurality of target treatment areas; the detection unit is configured to detect a radio frequency signal and output a detection signal to the control unit; the control unit is configured to control the impedance matching unit to perform impedance matching on the target treatment area, and in the state of impedance matching, control the output voltage of the radio frequency power supply according to a preset constant power, calculate a real-time load power of the target treatment area according to the detection signal of the detection unit, and adjust the output voltage of the radio frequency power supply based on the difference between the real-time load power and the preset constant power to maintain constant power output for the target treatment area; the radio frequency power supply is configured to adjust the output voltage according to the control of the control unit to maintain constant power output for the target treatment area.

8. The radio frequency control circuit for skin treatment as claimed in claim 7, wherein, The impedance matching unit comprises X impedance matching networks arranged in parallel and X relays, and each impedance matching network is arranged in series with a corresponding relay, and a controlled end of each relay is connected with the control unit respectively, and X is greater than or equal to 2.

9. A radio frequency control device for skin treatment, wherein, The device comprises the radio frequency control circuit for skin treatment according to claim 8.

10. A radio frequency control device for skin treatment, wherein, The device comprises a memory, a processor, and a computer program stored on the memory and executable on the processor, and the computer program is configured to implement the steps of the radio frequency control method for skin treatment according to any one of claims 1 to 7.

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