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

Abstract

The invention discloses a radio frequency control method, circuit, device and equipment for skin treatment, and relates to the technical field of radio frequency treatment, and the radio frequency control method for skin treatment comprises the steps: controlling an impedance matching unit to carry out impedance matching with a target treatment region when a pilot signal is applied to one of a plurality of target treatment regions; in the impedance matching state, controlling the output of the radio frequency power supply according to the set power, and calculating the load power according to the detection signal; and calculating a difference value between the set power and the load power, and controlling the output power of the radio frequency power supply according to the difference value, so that the load power is maintained to be the set power. According to the technical scheme provided by the invention, the technical problem that RF energy transmitted to body tissues in an existing radio frequency control circuit cannot maintain an ideal effect under different skin load characteristics can be solved; impedance matching is performed to reduce the loss of RF energy delivered to body tissue.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of radio frequency treatment, in particular to a radio frequency control method, circuit, device and equipment for skin treatment. BACKGROUND

[0002] 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 factory-calibrated, 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.

[0003] 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

[0004] 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.

[0005] To achieve the above-mentioned purpose, the radio frequency control method for skin treatment is applied to a radio frequency control circuit for skin treatment, which comprises an impedance matching unit, a radio frequency power supply and a detection unit, and the method comprises:

[0006] controlling the impedance matching unit to perform impedance matching with the target treatment area when a pilot signal is applied to one of the plurality of target treatment areas;

[0007] In the impedance matching state, the output voltage of the radio frequency power supply is controlled according to a preset constant power, and the real-time load power of the target treatment area is calculated according to the detection signal of the detection unit;

[0008] Based on the difference between the real-time load power and the preset constant power, the output voltage of the radio frequency power supply is adjusted to maintain constant power output to the target treatment area.

[0009] In one embodiment, the impedance matching unit includes X parallel impedance matching networks and X relays, with each impedance matching network connected in series with a corresponding relay, and X being greater than or equal to 2. The step of controlling the impedance matching unit to perform impedance matching with one of the multiple target treatment areas includes:

[0010] Each of the X relays is controlled to close and delayed for a preset time, and the matching output voltage of the radio frequency power supply is controlled accordingly.

[0011] The system receives the detection signal from the detection unit and obtains the forward peak voltage and reverse peak voltage of the radio frequency signal based on the detection signal.

[0012] Calculate the standing wave ratio (SWR) of the radio frequency signal when each relay is closed based on the forward peak voltage and the reverse peak voltage;

[0013] Compare the standing wave ratios (SWRs) when each relay is closed, and close the relay with the lowest SWR.

[0014] In one embodiment, the step of comparing the standing wave ratio (SWR) when each relay is closed, and closing the relay corresponding to the minimum SWR, includes:

[0015] Compare the standing wave ratio (SWR) when each relay is closed. If there are multiple minimum SWRs, compare the magnitudes of the positive peak voltages corresponding to the multiple minimum SWRs, and close the relay corresponding to the largest positive peak voltage.

[0016] In one embodiment, the detection unit includes a directional coupler, and the detection signal is the forward peak voltage and reverse peak voltage detected by the directional coupler coupling the forward and reverse electrical signals of the radio frequency signal as effective values. The step of calculating the real-time load power of the target treatment area based on the detection signal of the detection unit includes:

[0017] Based on the detected positive peak voltage and the reverse peak voltage, the load impedance of the target treatment area is calculated, and the load impedance includes real impedance and virtual impedance;

[0018] The real-time load power of the target treatment area is calculated based on the forward peak voltage, the reverse peak voltage, and the actual impedance of the load impedance.

[0019] In one embodiment, the step of calculating the real-time load power of the target treatment area based on the forward peak voltage, the reverse peak voltage, and the real impedance of the load impedance includes:

[0020] Based on the calculation formula for load power, the real-time load power of the target treatment area is calculated. The calculation formula for load power is as follows:

[0021]

[0022] 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 forward peak voltage phase detected by the directional coupler and the reverse peak voltage phase detected by the directional coupler.

[0023] In one embodiment, the radio frequency control circuit for skin treatment further includes an RF power regulator, which includes a PID controller and a digital-to-analog converter. The step of adjusting the output voltage of the radio frequency power supply based on the difference between the real-time load power and a preset constant power to maintain a constant power output to the target treatment area includes:

[0024] 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;

[0025] When the difference is greater than a preset difference, the PID controller is controlled to send a PID control signal to the digital-to-analog converter according to the preset PID control parameters;

[0026] 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 the preset PID control parameters.

[0027] This application also proposes a radiofrequency control circuit for skin treatment, which is applied to the radiofrequency control method described above. The radiofrequency control circuit includes: an impedance matching unit, a radiofrequency power supply, a detection unit, and a control unit. The control unit is connected to the controlled terminal of the impedance matching unit, the detection terminal of the detection unit, and the controlled terminal of the radiofrequency power supply. The output terminal of the radiofrequency power supply is connected to the input terminal of the detection unit, and the output terminal of the detection unit is connected to the input terminal of the impedance matching unit. The output terminal of the impedance matching unit is connected to an electrode in one of a plurality of target treatment areas.

[0028] The impedance matching unit is used to perform impedance matching on the target treatment region under the control of the control unit when a pilot signal is applied to one of a plurality of target treatment regions.

[0029] The detection unit is used to detect radio frequency signals and output detection signals to the control unit;

[0030] The control unit is used to control the impedance matching unit to perform impedance matching with the target treatment area. In the impedance matching state, the output voltage of the radio frequency power supply is controlled according to a preset constant power. The real-time load power of the target treatment area is calculated according to the detection signal of the detection unit. Based on the difference between the real-time load power and the preset constant power, the output voltage of the radio frequency power supply is adjusted to maintain a constant power output to the target treatment area.

[0031] The radio frequency power supply is used to adjust the output voltage according to the control unit to maintain a constant power output to the target treatment area.

[0032] In one embodiment, the impedance matching unit includes X impedance matching networks arranged in parallel and X relays, with each impedance matching network connected in series with a corresponding relay, and the controlled terminal of each relay being connected to the control unit, where X is greater than or equal to 2.

[0033] This application also proposes a radio frequency control device for skin treatment, which includes the radio frequency control circuit for skin treatment as described above.

[0034] This application also proposes a radiofrequency control device for skin treatment, the radiofrequency control device for skin treatment comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the radiofrequency control method for skin treatment as described in any of the preceding claims.

[0035] The technical solution of this application first applies a pilot signal to the target treatment area while the impedance matching unit performs impedance matching with the load of the radiofrequency treatment area. This ensures that the circuit and the load of the radiofrequency treatment area are in an impedance-matched state, minimizing the reflection of radiofrequency energy output. In this impedance-matched state, the radiofrequency electrical signal is detected in real time by a detection unit, and the real-time load power is calculated based on the detected signal. The load power of the radiofrequency treatment area can be accurately calculated without calibration. By comparing the difference between the set power and the real-time load power, the output power of the radiofrequency 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 radiofrequency treatment areas, thereby improving the accuracy and controllability of the radiofrequency output power. In summary, this method can detect the actual load power of the radiofrequency treatment area in real time, ensuring that the accuracy of load power detection is not affected by equipment aging. It guarantees that the radiofrequency treatment equipment can control the load power to maintain a constant power output at the set power when facing different radiofrequency treatment areas, and it does not require factory calibration, thus improving equipment production efficiency. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application 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 application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0037] Figure 1 A schematic flowchart illustrating an embodiment of the radiofrequency control method for skin treatment provided in this application;

[0038] Figure 2 A schematic flowchart illustrating one embodiment of the radiofrequency control method for skin treatment provided in this application;

[0039] Figure 3 A schematic flowchart illustrating one embodiment of the radiofrequency control method for skin treatment provided in this application;

[0040] Figure 4 A schematic flowchart illustrating one embodiment of the radiofrequency control method for skin treatment provided in this application;

[0041] Figure 5 A schematic flowchart illustrating one embodiment of the radiofrequency control method for skin treatment provided in this application;

[0042] Figure 6 A schematic flowchart illustrating one embodiment of the radiofrequency control method for skin treatment provided in this application;

[0043] Figure 7 A schematic diagram of the module structure of a radio frequency control circuit for skin treatment provided in this application (Example 1);

[0044] Figure 8 A schematic diagram of the module structure of the radio frequency control circuit for skin treatment provided in this application, according to Embodiment 2;

[0045] Figure 9 A schematic diagram of the module structure of one embodiment of the radiofrequency control circuit for skin treatment provided in this application;

[0046] Figure 10 A schematic diagram of the module structure of the radio frequency control circuit for skin treatment provided in this application, according to Embodiment 3;

[0047] Figure 11 A schematic diagram of the module structure of the radio frequency control circuit for skin treatment provided in this application, in embodiment four;

[0048] Figure 12 A schematic diagram of the module structure of the radio frequency control circuit for skin treatment provided in this application, in embodiment five;

[0049] Figure 13 A schematic diagram of the circuit structure of the radio frequency control circuit for skin treatment provided in this application, according to embodiment five;

[0050] Figure 14 This is a schematic diagram of the structure of the radiofrequency control device for skin treatment provided in this application.

[0051] Explanation of icon numbers:

[0052] 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~Xth impedance matching network; K1~KX, First relay~Xth relay; 50. Load power output unit;

[0053] 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.

[0054] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0055] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0056] It should be noted that if the embodiments of this application 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.

[0057] Furthermore, if the embodiments of this application 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 implies three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied. Furthermore, the use of "multiple" throughout the text implies two or more solutions. Moreover, 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. If 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 in this application.

[0058] Currently, existing methods for obtaining the load power of the treated area in radiofrequency control devices used for skin treatment typically involve calibrating the radiofrequency equipment at the factory to obtain the correspondence between different powers and radiofrequency electrical signals. The load power is then determined through fitting or interpolation. However, the power accuracy of this method depends on the number of calibration points; more calibration points result in higher accuracy, but too many calibration points are inconvenient for production and lead to low production efficiency. Moreover, this method not only fails to determine the actual load power of the treated area but also suffers from power degradation due to equipment aging, affecting the accuracy of load power detection. This results in a discrepancy between the actual radiofrequency power received by the treated area and the radiofrequency output power set by the host computer, causing the radiofrequency treatment device to be unable to maintain a constant power output when facing different radiofrequency treatment areas.

[0059] Therefore, existing technologies cannot detect the actual load power of the treated area in real time, which makes it impossible for radiofrequency therapy devices to maintain constant power output at the set power when facing different radiofrequency therapy areas. In addition, factory calibration is required, which makes the equipment production efficiency low.

[0060] This application proposes a radiofrequency control method for skin treatment.

[0061] Please see Figure 1 In one embodiment of this application, the radio frequency control method for skin treatment is applied to a radio frequency control circuit for skin treatment. The radio frequency control circuit for skin treatment includes an impedance matching unit, a radio frequency power supply, and a detection unit. The method includes steps S10 to S30:

[0062] Step S10: When applying a pilot signal to one of the multiple target treatment regions, control the impedance matching unit to perform impedance matching with the target treatment region;

[0063] It should be noted that the impedance matching unit can be a circuit composed of multiple relays and multiple impedance matching networks connected in parallel. These impedance matching networks have different impedance parameters; the more different impedance matching networks there are, the wider the impedance range that can be matched. By alternately connecting to the circuit to perform impedance matching with the target radiofrequency treatment area, the relay is switched to the impedance matching network closest to the target treatment area. Through impedance matching between the impedance matching unit and the connected target treatment area, the reflection of radiofrequency energy is minimized, ensuring that the radiofrequency energy enters the tissue of the target treatment area to the maximum extent.

[0064] Step S20: Under impedance matching, the output voltage of the radio frequency power supply is controlled according to a preset constant power, and the real-time load power of the target treatment area is calculated according to the detection signal of the detection unit.

[0065] It should be noted that the detection unit can be a directional coupler, and the real-time power can be calculated based on the detection signal output by the detection unit and the real-time load power calculation formula of the radiofrequency treatment area.

[0066] Step S30: Based on the difference between the real-time load power and the preset constant power, adjust the output voltage of the radio frequency power supply to maintain the preset constant power output to the target treatment area.

[0067] It should be noted that the radio frequency (RF) power supply includes an enable terminal and a control terminal. The enable terminal controls the RF power supply to turn on and off, while the control terminal allows for adjustment and control of the RF power supply's output power. The set power is a target power set via a host computer. When the RF treatment load power remains constant at the set power, the RF treatment effect can be achieved. The RF treatment load power can be controlled by adjusting the RF power supply's output power. Based on the real-time load power calculated in step S20, the difference between the load power and the set power is calculated, and the RF power supply's output power is adjusted according to this difference to control the load power, forming a closed-loop control system for the load power. The system continuously calculates and adjusts the real-time load power based on the detection signal to ensure that the load power remains constant at the preset constant power throughout the entire treatment process.

[0068] In this embodiment, during radiofrequency control for skin treatment, the impedance matching unit is first controlled to achieve impedance matching with the radiofrequency treatment area when a pilot signal is applied to the target treatment area. This reduces the reflection of radiofrequency energy, allowing the radiofrequency energy output from the radiofrequency power supply to be maximized and input to the radiofrequency treatment area. After achieving impedance matching with the radiofrequency treatment area, the detection unit detects the radiofrequency signal in the radiofrequency circuit and outputs a detection signal. Based on the detection signal and the real-time load power calculation formula for radiofrequency treatment, the real-time load power of radiofrequency treatment is calculated. This method is unaffected by equipment aging and can accurately calculate the load power of the radiofrequency treatment area without calibration. By comparing the difference between the set power and the real-time calculated load power, the output power of the radiofrequency 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 radiofrequency treatment areas, thereby improving the accuracy and controllability of the radiofrequency output power. In summary, this method can detect the actual load power of the radiofrequency treatment area in real time, ensuring that the accuracy of load power detection is not affected by equipment aging. It guarantees that the radiofrequency treatment equipment can control the load power to maintain a constant power output when facing different radiofrequency treatment areas, and it does not require factory calibration, thus improving equipment production efficiency.

[0069] Specifically, please refer to Figure 2 In one feasible implementation, the impedance matching unit includes X parallel impedance matching networks and X relays, with each impedance matching network connected in series with a corresponding relay, where X is greater than or equal to 2. Step S10 may include steps S11 to S14:

[0070] It should be noted that the impedance of different radiofrequency treatment target areas varies. This may be due to differences between individuals being treated, differences between different treatment sites of the same individual, or even differences in the impedance of the same treatment site of the same individual at different treatment times. If the impedance does not match the impedance of the radiofrequency control circuit used for skin treatment, radiofrequency reflection energy will be generated in the radiofrequency circuit. The reflected energy bounces back and forth between the radiofrequency power supply and the load of the radiofrequency treatment area and is eventually radiated into the environment as heat energy of the resistance in the transmission line. In addition, the reflected energy introduces interference signals that propagate along the transmission line, which seriously affects the quality of the radiofrequency signal.

[0071] The relay can be an electromagnetic relay, a solid-state relay, or other circuit device that enables circuit switching; this application does not limit this.

[0072] Impedance matching networks are LC series-parallel networks composed of capacitors and resistors. Specific impedance matching networks are connected to the circuit via relay control, thereby achieving impedance matching with different loads. Multiple impedance matching networks have different impedances. The number of impedance matching networks (X) must be at least 2. More impedance matching networks allow for a finer or wider impedance matching range, but also increase the impedance matching time and treatment time. The number of impedance matching networks should be set according to the actual situation; this application does not impose a limitation on this.

[0073] Step S11: Control one of the X relays to close, and after a preset time, control the radio frequency power supply to output a preset voltage;

[0074] 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 RF power supply is turned on only after the relay has completed its closing action. Taking a relay as an example, the preset time is 10ms. The setting of the preset time should be set according to the actual circuit design and the selection of the relay. This application does not limit this. The pilot voltage is the voltage of the pilot signal used by the RF power supply for impedance matching. By adjusting the control voltage of the RF power supply to a small value (0.5V), the preset voltage of the RF power supply is controlled to enable the directional coupler to detect the power output of the RF power supply. At the same time, it will not cause excessive power to cause excessive RF energy output to the load, thereby improving the safety factor in the impedance matching process and reducing energy waste.

[0075] Step S12: Receive the detection signal from the detection unit, and obtain the forward peak voltage and reverse peak voltage of the radio frequency signal based on the detection signal;

[0076] It should be noted that the detection signal is the coupled positive voltage signal and coupled negative voltage signal output by the detection unit when the positive voltage signal and the negative voltage signal in the radio frequency signal are coupled. The data obtained by sampling the detection signal are placed in a data buffer of at least 128 bytes, and the maximum value in the buffer is the positive peak voltage and the negative peak voltage of the radio frequency signal.

[0077] Step S13: Calculate the standing wave ratio (SWR) of the radio frequency signal when each relay is closed based on the forward peak voltage and the reverse peak voltage;

[0078] As an example, the formula for calculating the standing wave ratio is:

[0079]

[0080] Where γ is the standing wave ratio, rev is the absolute value of the reflection ratio, rev=Vrev / Vfwd, where Vrev is the forward peak voltage and Vfwd is the reverse peak voltage.

[0081] Step S14: Compare the standing wave ratio (SWR) when each relay is closed, and close the relay corresponding to the smallest SWR.

[0082] Compare the magnitudes of all the stated standing wave ratios, determine the relay corresponding to the minimum standing wave ratio, and close the relay corresponding to the minimum standing wave ratio to make the radio frequency control circuit for skin treatment and the load of the radio frequency treatment area in an impedance-matched state.

[0083] In this embodiment, X LC series-parallel impedance matching networks are set up, and relays connected in series with the impedance matching networks are controlled to control each impedance matching network to be connected to the circuit. By detecting the forward peak voltage and reverse peak voltage when different impedance matching networks are connected to the circuit, the standing wave ratio (SWR) of different impedance matching networks connected to the circuit is calculated. The impedance matching between the circuit and the load of the radiofrequency treatment area is determined based on the SWR. This allows the circuit to perform impedance matching over a wide range by switching relays, thereby minimizing the reflection of radiofrequency energy when connected to different radiofrequency treatment area loads, maximizing the conversion of the output power of the radiofrequency power supply to the load power, reducing radiofrequency interference and energy waste, enhancing the radiofrequency control effect for skin treatment, reducing the heating of resistors in the transmission line, and extending the service life of the circuit.

[0084] Specifically, please refer to Figure 3 In one possible implementation, step S14 may include step S141:

[0085] Step S141: Compare the standing wave ratio (SWR) when each relay is closed. If there are multiple minimum SWRs, compare the magnitude of the positive peak voltage corresponding to the multiple minimum SWRs, and close the relay corresponding to the largest positive peak voltage.

[0086] In this embodiment, when two or more relays have the same VSWR, the relay corresponding to the maximum amplitude of the coupled positive electrical signal when each relay is closed is compared, and the relay with the maximum amplitude is closed. This makes the impedance matching process more accurate and ensures that the output power of the RF power supply is converted into load power to the maximum extent.

[0087] In addition, in one feasible implementation, impedance matching of the load is not limited to the closing of a single relay. Impedance matching can also be achieved by simultaneously closing multiple relays. By controlling the closing of multiple relays, more impedance matching combination networks can be formed. Taking X=3 as an example, in addition to the three impedance matching networks formed by the closing of the first, second, and third relays individually, there are also four impedance matching networks formed by the simultaneous closing of the first relay with the second and third relays, the simultaneous closing of the second and third relays, and the simultaneous closing of the first, second, and third relays. Through the technical solution of this embodiment, more precise and wider-ranging impedance matching can be achieved.

[0088] 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. The first impedance matching network matches a skin tissue load impedance of 35Ω for the radiofrequency treatment area, the second impedance matching network matches a skin tissue load impedance of 100Ω, and the third impedance matching network matches a skin tissue load impedance of 150Ω. Exemplarily, the impedance matching implementation process of this embodiment is as follows:

[0089] Step 1: Control one of the first relay, the second relay and the third relay to close respectively, and after a preset time of 10ms, control the RF power supply to turn on and output a preset voltage of 0.5V to the RF power supply to control the output power of the RF power supply;

[0090] Step 2: When the first relay, the second relay, and the third relay are closed, the coupled forward voltage signal and the coupled reverse voltage signal generated by the detection unit from the forward voltage signal and the reverse voltage signal of the radio frequency electrical signal are sampled 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 of the relays is closed;

[0091] Step 3: Based on the coupled forward voltage data and coupled reverse voltage data when each relay is closed, derive the coupled forward peak voltage and coupled reverse peak voltage when each relay is closed. Place the coupled forward voltage data and coupled reverse voltage data when each relay is closed into a data buffer BUF (buffer) of at least 128 bytes. Calculate the maximum value in the data buffer BUF, which is the voltage peak value. Calculate the first standing wave ratio (SWR) SWR1 based on the coupled forward voltage peak value Vfwd1 and coupled reverse voltage peak value Vrev1 when the first relay is closed. Calculate the second standing wave ratio (SWR) SWR2 based on the coupled forward voltage peak value Vfwd2 and coupled reverse voltage peak value Vrev2 when the second relay is closed. Calculate the third standing wave ratio (SWR) SWR3 based on the coupled forward voltage peak value Vfwd3 and coupled reverse voltage peak value Vrev3 when the third relay is closed.

[0092] Step 4: Compare the magnitudes of the first standing wave ratio (SWR1), the second standing wave ratio (SWR2), and the third standing wave ratio (SWR3). If there are no multiple equal minimum standing wave ratios, close the relay corresponding to the minimum standing wave ratio and turn off the RF power supply.

[0093] Step 5: If there are multiple minimum VSWRs, compare the coupled forward peak voltages corresponding to the multiple minimum VSWRs, close the relay corresponding to the maximum coupled forward peak voltage, and turn off the RF power supply.

[0094] It should be noted that the above examples are only for understanding this application and do not constitute a limitation on the radiofrequency control method for skin treatment in this application. Any simple modifications based on this technical concept are within the protection scope of this application.

[0095] Specifically, please refer to Figure 4 In one feasible implementation, the detection unit includes a directional coupler, and the detection signal is the positive peak voltage and reverse peak voltage detected by the directional coupler coupling the forward and reverse electrical signals of the radio frequency signal as effective values. Step S20 includes steps S21 to S23:

[0096] It should be noted that the electrical signal mentioned in this application is a voltage signal. 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 number of turns, and output the coupled positive electrical signal and the coupled negative electrical signal respectively.

[0097] First, forward and reverse voltage data are obtained by sampling the coupled forward and reverse electrical signals at a sampling frequency. The sampled forward and reverse voltage data are then placed into data buffers of at least 128 bytes each. The maximum values ​​in these data buffers are the maximum amplitudes of the coupled forward and reverse electrical signals, respectively. The maximum amplitude of the coupled forward electrical signal is the amplitude of the forward peak voltage, and the maximum amplitude of the coupled reverse electrical signal is the amplitude of the reverse peak voltage.

[0098] Then, signal processing is performed on the coupled forward electrical signal and the coupled reverse electrical signal. The signal processing can be Fast Fourier Transform (FFT) to obtain the amplitude spectrum and phase spectrum of the coupled forward electrical signal and the coupled reverse electrical signal, respectively. The fundamental frequency is obtained according to the frequency corresponding to the maximum amplitude after removing the DC component in the amplitude spectrum. The frequency resolution of the FFT can be obtained according to the ratio of the sampling frequency to the number of bytes in the data buffer. The index number of the phase spectrum can be obtained according to the ratio of the fundamental frequency to the frequency resolution. Based on the index number, the phase of the forward peak voltage and the reverse peak voltage can be obtained respectively by searching in the phase spectrum of the coupled forward electrical signal and the phase spectrum of the coupled reverse electrical signal.

[0099] Therefore, the detection signal is the positive peak voltage and the reverse peak voltage detected by the directional coupler coupling the positive and negative electrical signals of the radio frequency signal. The positive peak voltage can characterize 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 characterize the radio frequency energy lost during radio frequency treatment (reflected back and forth at the input end of the receiving device and the output end during transmission, and finally consumed by resistive heating).

[0100] Step S21: Calculate the load impedance of the target treatment area based on the detected positive peak voltage and the reverse peak voltage, wherein the load impedance includes real impedance and virtual impedance;

[0101] It should be noted that the reflectivity of the radio frequency signal can be obtained from the phase difference between the forward and reverse peak voltages detected by the directional coupler, as well as the phase and amplitude of the forward and reverse peak voltages.

[0102] As an example, the formula for calculating reflectance is as follows:

[0103]

[0104] Where Γ is the reflection ratio, Vrev is the amplitude of the forward peak voltage detected by the directional coupler, and Vfwd is the amplitude of the reverse 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.

[0105] Based on the reflectance and the source impedance of the radiofrequency control circuit for skin treatment, the real-time load impedance of the radiofrequency treatment area can be calculated.

[0106] As an example, the formula for calculating the impedance of a load is as follows:

[0107]

[0108] Where Γ is the reflectance, Z0 is the source impedance (50 ohms standard impedance) of the radio frequency control circuit used for skin treatment, and Z L R is the load impedance. L Let be the real impedance of the load, and Zi be the virtual impedance of the load.

[0109] Step S22: Calculate the real-time load power of the target treatment area based on the forward peak voltage, the reverse peak voltage, and the actual impedance of the load impedance;

[0110] It should be noted that the real-time load power of the radiofrequency treatment area can be calculated by the amplitude and phase of the forward and reverse peak voltages and the real-time load impedance. The real-time load impedance can be calculated by the amplitude and phase of the coupled forward and reverse electrical signals. Therefore, the load power can be regarded as a function of the forward and reverse peak voltages, reflecting the changing trend of the real-time load power.

[0111] Specifically, please refer to Figure 5 In one possible implementation, step S22 may include step S221:

[0112] Step S221: Based on the calculation formula for the load power, calculate the real-time load power of the target treatment area. The calculation formula for the load power is:

[0113]

[0114] 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 forward peak voltage phase detected by the directional coupler and the reverse peak voltage phase detected by the directional coupler.

[0115] It should be noted that the load power P L Let V be the vector sum of the forward and reverse peak voltages of the radiofrequency signal, representing the load power of the radiofrequency treatment area. Then, V represents the actual radiofrequency energy received by the load in the radiofrequency area during the treatment process.

[0116]

[0117] The directional coupler proportionally couples the forward and reverse peak voltages of the radio frequency signal according to the turns ratio N to obtain the forward and reverse peak voltages detected by the directional coupler. Furthermore, the directional coupler couples the forward and reverse peak voltages in opposite transmission directions of the radio frequency signal into the forward and reverse peak voltages detected by the directional coupler in the same transmission direction. Therefore:

[0118]

[0119] According to the above formula, we have:

[0120]

[0121] 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 radio frequency signal. Therefore, the absolute value of the radio frequency signal reflectance can be obtained based on the ratio of the amplitudes of the reverse peak voltage and the forward peak voltage detected by the directional coupler. As an example, the formula for calculating the absolute value of the reflectance is as follows:

[0122]

[0123] Based on the above formula, further, based on the amplitude of the forward peak voltage detected by the directional coupler, the phase difference between the forward and reverse peak voltages detected by the directional coupler, and the absolute value of the reflection ratio, the real-time load power of the radiofrequency treatment area can be obtained. As an example, the formula for calculating the real-time load power is as follows:

[0124]

[0125] For example, when the input voltage at the controlled end of the RF power supply is 0.79V, the three sets of power calculation results obtained using the power calculation formula of this embodiment are shown in the table below:

[0126] DAC = 0.79V

[0127]

[0128] In this embodiment, the forward voltage and reverse voltage represent the maximum amplitudes of the coupled forward and reverse electrical signals, respectively. The phase angle is the phase difference between the forward and reverse voltages. The calculated load impedance is the load impedance calculated using the forward voltage, reverse voltage, and phase angle. The measured load impedance is the actual load impedance measured by a network analyzer. The measured load power is the measured value of the load power. The formula-calculated power is the load power calculated using the load power algorithm formula in this embodiment. The power accuracy is the ratio of the formula-calculated power to the measured load power, representing the precision of the formula-calculated power. From the above data, it can be seen that the load power calculated using the load power algorithm formula in this embodiment has high power accuracy and can accurately reflect the actual load power situation.

[0129] Specifically, please refer to Figure 6 In one feasible implementation, the radio frequency control circuit for skin treatment further includes an RF power regulator, which includes a PID controller and a digital-to-analog converter. Step S30 may include steps S31 to S33:

[0130] Step S31: Send a control signal to the digital-to-analog converter according to the set power, and send the difference value to the PID controller;

[0131] It should be noted that the radio frequency control circuit used for skin treatment first sends an initial control signal to the digital-to-analog converter (DAC) based on the power value set by the user via the host computer. This control signal is used to control the DAC to output a preset voltage value, and the output power of the radio frequency power supply can be controlled by the voltage value output by the DAC.

[0132] Step S32: When the difference is greater than a preset difference, the PID controller is controlled to send a PID control signal to the digital-to-analog converter according to the preset PID control parameters.

[0133] It should be noted that when the difference between the load power and the set power exceeds a preset threshold, it indicates a significant deviation between the current load power and the set power, requiring stronger control to quickly reduce this deviation. In this case, the system will control the PID controller according to preset PID control parameters (including proportional, integral, and derivative coefficients, and the sampling period), sending a PID control signal to the digital-to-analog converter based on the deviation. PID control combines proportional, integral, and derivative control strategies, enabling faster and more accurate adjustment of the system state. For example, the calculation formula for the PID control signal is as follows:

[0134]

[0135] Where k is the sampling sequence number, u k Let e ​​be the PID controller output value at the k-th sampling time. k e is the difference between the load power and the set power at the k-th sampling time. k-1 Kp is the difference between the load power and the set power at the (k-1)th sampling time, where Kp is the proportional coefficient, T is the sampling period, Ti is the integral coefficient, and Td is the differential coefficient.

[0136] 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 the preset PID control parameters.

[0137] It should be noted that when the difference is less than or equal to the preset difference, it indicates that the current load power is close to the set power. At this point, excessive control is not needed to prevent system oscillation. The system then switches to PI control (containing only proportional and integral control), sending PI control signals to the digital-to-analog converter. PI control is more stable than PID control and is suitable for fine-tuning the system as it approaches the target state.

[0138] In this embodiment, the PID control signal or PI control signal is a compensation signal output by the PID controller based on the deviation between the load power and the set power. It is used together with the initial control signal to control the output voltage of the digital-to-analog converter (DAC) to dynamically adjust the DAC voltage value, thereby adjusting the output power of the RF power supply and ultimately adjusting the load power. This ensures that the load power dynamically approaches the set power. The entire 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 RF power supply is adjusted, ensuring that the difference between the load power and the set power does not exceed 20% of the set power. This control method offers high flexibility and accuracy, enabling constant power output under various load conditions.

[0139] In summary, the technical solution of this application first achieves impedance matching between the radiofrequency treatment area load and the impedance matching unit. This allows the circuit to perform wide-range impedance matching via a switching relay, ensuring that the radiofrequency control circuit and the radiofrequency treatment area load are in an impedance-matched state when different radiofrequency treatment area loads are connected. At this state, radiofrequency energy reflection is minimized, and the output power of the radiofrequency power supply is converted into load power to the maximum extent. Then, in the impedance-matched state, the forward and reverse electrical signals of the radiofrequency signal are coupled through a directional coupler to obtain the forward and reverse peak voltages detected by the directional coupler. Based on the amplitude and phase of the forward and reverse peak voltages detected by the directional coupler, the load impedance of the radiofrequency treatment area can be obtained in real time. Furthermore, based on the amplitude and phase of the forward and reverse peak voltages detected by the directional coupler and the real-time load impedance, the real-time load power calculation formula in this application allows for accurate calculation of the real-time load power of the radiofrequency treatment area without the influence of equipment aging or calibration. 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 a 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. Furthermore, no factory calibration is required, thus reducing production costs, minimizing the risks caused by incorrect calibration data from production line technicians, and improving equipment production efficiency.

[0140] Furthermore, the technical solution of this embodiment can also perform self-fault diagnosis through real-time monitoring of load power. It can detect the trend of load power change during the treatment process in real time. Abnormal power fluctuations may be a precursor to 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 reported in a timely manner, which helps to troubleshoot and repair the fault.

[0141] Please see Figure 7 This application also proposes a radiofrequency control circuit for skin treatment, applied to the aforementioned radiofrequency control method for skin treatment. In a first embodiment of the radiofrequency control circuit for skin treatment in this application, the radiofrequency control circuit for skin treatment includes: an impedance matching unit 40, a radiofrequency power supply 10, a detection unit 20, and a control unit 30. The control unit 30 is connected to the controlled terminal of the impedance matching unit 40, the detection terminal of the detection unit 20, and the controlled terminal of the radiofrequency power supply 10, respectively. The output terminal of the radiofrequency power supply 10 is connected to the input terminal of the detection unit 20, and the output terminal of the detection unit 20 is connected to the input terminal of the impedance matching unit 40. The output terminal of the impedance matching unit 40 is connected to the electrode of one of a plurality of target treatment areas; wherein...

[0142] The impedance matching unit 40 is controlled by the control unit 30 to perform impedance matching with the target treatment region when a pilot signal is applied to one of a plurality of target treatment regions.

[0143] The detection unit 20 is used to detect radio frequency signals and output detection signals to the control unit 30;

[0144] The control unit 30 is used to control the impedance matching unit 40 to perform impedance matching with the target treatment area. In the impedance matching state, the radio frequency power supply 10 is controlled to output power according to the preset constant power, and the real-time load power of the target treatment area is calculated according to the detection signal of the detection unit 20. Based on the difference between the real-time load power and the preset constant power, the output voltage of the radio frequency power supply 10 is adjusted to maintain a constant power output to the target treatment area.

[0145] The radio frequency power supply 10 is used to adjust the output voltage according to the control unit 30 to maintain a constant power output to the target treatment area.

[0146] It should be noted that the impedance matching unit 40 can be a circuit composed of multiple parallel LC impedance matching networks and relays, 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 a portion of the power of the input signal to another port. It can distinguish the main transmission direction and reflection direction of the signal and output at different ports to couple the positive voltage signal and the reverse voltage signal of the radio frequency signal, and transmit the resulting coupled positive electrical signal and coupled reverse electrical signal to the processor 31.

[0147] The control unit 30 consists 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, or any other chip with control capabilities. This embodiment does not specifically limit the processor 31 to this type. The processor 31 is also connected to a host computer and receives the set power value transmitted from the host computer.

[0148] The radio frequency power supply 10 is a power supply device capable of generating a sinusoidal voltage at a fixed frequency. It is turned on or off by the processor 31 through the enable terminal, and receives the control voltage at the controlled terminal for power adjustment. The radio frequency power supply 10 can be a transistor radio frequency power supply or a vacuum tube radio frequency power supply. This embodiment does not make a specific limitation on this.

[0149] The radio frequency (RF) control circuit for skin treatment provided in this application, employing the RF control method for skin treatment described in the above embodiments, solves the problems in the prior art where not only is the actual load power of the treated area unable to be detected in real time, leading to the inability of the RF treatment device to maintain a constant power output at the set power when facing different RF treatment areas, but also the need for factory calibration results in low equipment production efficiency. Compared with the prior art, the beneficial effects of the RF control circuit for skin treatment provided in this application are the same as those of the RF control method for skin treatment provided in the above embodiments, and other technical features in this RF control circuit for skin treatment are the same as those disclosed in the methods of the above embodiments, and will not be repeated here.

[0150] Based on the first embodiment of the radio frequency control circuit for skin treatment described above, in the second embodiment of the radio frequency control circuit for skin treatment in this application, please refer to... Figure 8 and Figure 9 The control unit 30 further includes an RF power regulator 32, which includes:

[0151] A PID controller 321, the input terminal of which is connected to the processor 31, is used to receive the difference and output a compensation signal according to the difference;

[0152] A digital-to-analog converter 322, the input terminals of which are respectively connected to the output terminals of the processor 31 and the PID controller 321, is used to receive the control signal output by the processor 31 and the compensation signal output by the PID controller 321, and output a power adjustment signal according to the control signal and the compensation signal;

[0153] A voltage regulator 323 is provided, with its input terminal connected to the output terminal of the digital-to-analog converter 322 and its output terminal connected to the controlled terminal of the radio frequency power supply 10. The voltage regulator 323 is used to receive the power adjustment signal, amplify the power adjustment signal proportionally, and output it to the radio frequency power supply 10 to control the output power of the radio frequency power supply 10.

[0154] It should be noted that the PID controller 321 (Proportional-Integral-Derivative Controller) is a feedback loop component widely used in industrial control. It achieves precise control of the system by adjusting parameters (Kp, Ki, Kd). In this embodiment, the PID controller 321 receives the difference between the load power input by the processor 31 and the set power, and then calculates the output value of the compensation signal based on the difference between the load power and the set power. The output value of the digital-to-analog converter 322 is adjusted by the compensation signal to dynamically adjust the power of the RF power supply 10, thereby controlling the real-time load power to be maintained at a preset constant power.

[0155] 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, or other digital-to-analog converters. This embodiment does not specifically limit it. 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 then output to the RF power supply 10 via the voltage regulator 323 to dynamically adjust the output power of the RF power supply 10.

[0156] The voltage regulator 323 can be an isolation voltage regulator, an inductive voltage regulator, a thyristor voltage regulator, etc. This embodiment does not specifically limit it. 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 RF power supply 10. It can also stabilize the voltage, ensuring that the RF power supply 10 can work under a stable control voltage, thereby improving the stability and accuracy of power control.

[0157] 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 in this application, please refer to... Figure 10 The impedance matching unit 40 includes X parallel impedance matching networks and X relays, with each impedance matching network connected in series with a corresponding relay. The controlled terminal of each relay is connected to the control unit 30, and X is greater than or equal to 2.

[0158] The radio frequency control circuit for skin treatment also includes a load power output circuit 50. The output terminal of the impedance matching unit 40 is connected to the input terminal of the load power output circuit 50, and the output terminal of the load power output circuit 50 is connected to the radio frequency treatment load. The load power output circuit 50 is used to output radio frequency energy to the radio frequency treatment load.

[0159] It should be noted that the relay can be an electromagnetic relay, a solid-state relay, or other circuit device that realizes circuit switching, and this embodiment does not specifically limit it. 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.

[0160] The load power output circuit 50 is in direct contact with the tissue in the radiofrequency treatment area and is used to output load power to the tissue in the radiofrequency treatment area. The load power output circuit 50 is a combination of a positive treatment electrode and a 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. Some of the radiofrequency electrical signal will be lost during transmission due to reflection.

[0161] Compared with the prior art, the beneficial effects of the impedance matching unit 40 in the radio frequency control circuit for skin treatment provided in this application are the same as the beneficial effects of the radio frequency control method for skin treatment provided in the above embodiments. Furthermore, the other technical features of the impedance matching unit 40 in the radio frequency control circuit for skin treatment are the same as the features disclosed in the radio frequency control method for skin treatment in the above embodiments, and will not be repeated here.

[0162] Based on the first embodiment of the radio frequency control circuit for skin treatment described above, the directional coupler 21 includes an input terminal, an output terminal, a forward coupling terminal, and a reverse coupling terminal. The detection signal includes a coupled forward electrical signal and a coupled reverse electrical signal. In the fourth embodiment of the radio frequency control circuit for skin treatment in this application, please refer to... Figure 11 The detection unit 20 further includes:

[0163] The low-pass filter module 22 includes a first low-pass filter 221 and a second low-pass filter 222. The input terminal of the first low-pass filter 221 is connected to the forward coupling terminal of the directional coupler 21 and is used to filter high-frequency noise of the coupled forward electrical signal. The second low-pass filter 222 is connected to the reverse coupling terminal of the directional coupler 21 and is used to filter high-frequency noise of the coupled reverse electrical signal.

[0164] The proportional amplifier module 23 includes a first proportional amplifier 231 and a second proportional amplifier 232. The input terminal of the first proportional amplifier 231 is connected to the output terminal of the first low-pass filter 221 and is used to proportionally amplify the coupled positive electrical signal output by the first low-pass filter 221. The second proportional amplifier 232 is connected to the output terminal of the second low-pass filter 222 and is used to proportionally amplify the coupled reverse electrical signal output by the second low-pass filter 222.

[0165] An analog-to-digital converter 24 is provided, with its first input terminal connected to the first output terminal of the directional coupler 21, its second input terminal connected to the second output terminal of the directional coupler 21, and its first and second input terminals respectively connected to the processor 31. The converter is used to convert the coupled positive electrical signal and the coupled negative electrical signal into digital signals and output them to the processor 31 respectively.

[0166] It should be noted that a low-pass filter is an electronic filter that allows signals below the cutoff frequency to pass through, but signals above the cutoff frequency cannot pass through. In this embodiment, the low-pass filter module 22 filters the coupled forward voltage signal and the coupled reverse voltage signal to remove high-frequency noise from the coupled forward voltage signal and the coupled reverse voltage signal. This results in the output of the coupled forward voltage signal and the coupled reverse voltage signal to the processor 31 after removing the high-frequency noise. This allows the processor 31 to avoid the influence of high-frequency noise on the calculation results of the load power of radiofrequency therapy when calculating the load power, thereby further improving the accuracy of radiofrequency therapy load power detection.

[0167] In this embodiment, the coupled forward voltage signal and the coupled reverse voltage signal need to be amplified by the proportional amplifier module 23 so that the processor 31 can identify them and meet the processing requirements of the processor 31.

[0168] The analog-to-digital converter 24 is an electronic device that converts analog signals into digital signals. In this embodiment, the analog-to-digital converter 24 can be selected as a high-speed analog-to-digital converter, which converts the coupled forward voltage signal and the coupled reverse voltage signal from continuous analog signals into discrete digital signals so that the processor 31 can process, store and transmit them. The high-speed analog-to-digital converter means that it can complete the conversion of analog signals to digital signals in a short time, and can respond to changes in signals in a timely manner and transmit the signals to the processor 31, so that the processor 31 can detect the load power in real time and dynamically adjust the load power to approximate the set power.

[0169] Based on the first, second, third, and / or fourth embodiments of the radio frequency control circuit for skin treatment described above, in the fifth embodiment of the radio frequency control circuit for skin treatment in this application, the radio frequency control circuit for skin treatment possesses all the technical features of each embodiment of the radio frequency control circuit for skin treatment described above. Therefore, the module structure of the radio frequency control circuit for skin treatment can be... Figure 12 The structure shown.

[0170] As an example, processor 31 is selected as an MCU, load power output circuit 50 is selected as treatment electrode + and treatment electrode -, impedance matching unit 40 is selected as relay 1, relay 2, relay 3, LC series-parallel matching network 1, LC series-parallel matching network 2 and LC series-parallel matching network 3, and digital-to-analog converter 322 is selected as a high-speed digital-to-analog converter, which can obtain the following: Figure 13 The diagram shows the circuit structure of a radiofrequency control circuit used for skin treatment.

[0171] This application also proposes a radio frequency control device for skin treatment, which includes the radio frequency control circuit for skin treatment as described above.

[0172] The radio frequency control device for skin treatment provided in this application solves the problems in the prior art, which not only cannot detect the actual load power of the treated area in real time, causing the radio frequency treatment device to be unable to maintain a constant power output at the set power when facing different radio frequency treatment areas, but also require factory calibration, resulting in low equipment production efficiency. Compared with the prior art, the beneficial effects of the radio frequency control device for skin treatment provided in this application are the same as the beneficial effects of the radio frequency control circuit for skin treatment provided in the above embodiments, and will not be repeated here.

[0173] This application provides a radio frequency control device for skin treatment, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the radio frequency control method for skin treatment described in the above embodiments.

[0174] The following is for reference. Figure 14 The diagram illustrates a structural schematic of a radio frequency control device suitable for implementing embodiments of this application for skin treatment. The radio frequency control device for skin treatment in the embodiments of this application may include, but is not limited to, mobile terminals such as mobile phones, laptops, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Description), PMPs (Portable Media Players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 14 The radio frequency control device for skin treatment shown is merely an example and should not be construed as limiting the functionality and scope of use of the embodiments of this application.

[0175] likeFigure 14 As shown, the radiofrequency control device for skin treatment may include a processing unit 1001 (e.g., a central processing unit, a graphics processor, 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. The RAM 1004 also stores various programs and data required for the operation of the radiofrequency control device for skin treatment. The processing unit 1001, ROM 1002, and RAM 1004 are interconnected via a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems can be connected to I / O interface 1006: input devices 1007 including, for example, touchscreens, touchpads, keyboards, mice, image sensors, microphones, accelerometers, gyroscopes, etc.; output devices 1008 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; storage devices 1003 including, for example, magnetic tapes, hard disks, etc.; and communication devices 1009. Communication device 1009 allows the radiofrequency control device for skin treatment to communicate wirelessly or wiredly with other devices to exchange data. Although radiofrequency control devices for skin treatment with various systems are shown in the figures, it should be understood that it is not required to implement or possess all of the systems shown. More or fewer systems may be implemented alternatively.

[0176] Specifically, according to the embodiments disclosed in this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments disclosed in this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device, or installed from storage device 1003, or installed from ROM 1002. When the computer program is executed by processing device 1001, it performs the functions defined in the methods of the embodiments disclosed in this application.

[0177] The radiofrequency control device for skin treatment provided in this application, employing the radiofrequency control method for skin treatment described in the above embodiments, can solve the technical problem of radiofrequency treatment control. Compared with the prior art, the beneficial effects of the radiofrequency control device for skin treatment provided in this application are the same as those of the radiofrequency control method for skin treatment provided in the above embodiments, and other technical features of the radiofrequency control device for skin treatment are the same as those disclosed in the previous embodiment method, and will not be repeated here.

[0178] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0179] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0180] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent scope of this application.

Claims

1. A radiofrequency control method for skin treatment, characterized in that, A radio frequency control circuit for skin treatment, the radio frequency control circuit for skin treatment including an impedance matching unit, a radio frequency power supply and a detection unit, the method comprising: When a pilot signal is applied to one of a plurality of target treatment regions, the impedance matching unit is controlled to perform impedance matching with the target treatment region. Under impedance matching conditions, the output voltage of the radio frequency power supply is controlled according to a preset constant power, and the real-time load power of the target treatment area is calculated according to the detection signal of the detection unit. Based on the difference between the real-time load power and the preset constant power, the output voltage of the radio frequency power supply is adjusted to maintain the preset constant power output to the target treatment area.

2. The method as described in claim 1, characterized in that, The impedance matching unit includes X parallel impedance matching networks and X relays, with each impedance matching network connected in series with a corresponding relay, and X being greater than or equal to 2. The step of controlling the impedance matching unit to perform impedance matching with the target treatment region when applying a pilot signal to one of the multiple target treatment regions includes: Each of the X relays is controlled to close and delayed for a preset time, and the matching output voltage of the radio frequency power supply is controlled accordingly. The system receives the detection signal from the detection unit and obtains the forward peak voltage and reverse peak voltage of the radio frequency signal based on the detection signal. Calculate the standing wave ratio (SWR) of the radio frequency signal when each relay is closed based on the forward peak voltage and the reverse peak voltage; Compare the standing wave ratios (SWRs) when each relay is closed, and close the relay with the lowest SWR.

3. The method as described in claim 2, characterized in that, The step of comparing the standing wave ratio (SWR) when each relay is closed, and closing the relay corresponding to the minimum SWR, includes: Compare the standing wave ratio (SWR) when each relay is closed. If there are multiple minimum SWRs, compare the magnitudes of the positive peak voltages corresponding to the multiple minimum SWRs, and close the relay corresponding to the largest positive peak voltage.

4. The method as described in claim 1, characterized in that, The detection unit includes a directional coupler, and the detection signal is the forward peak voltage and reverse peak voltage detected by the directional coupler coupling the forward and reverse electrical signals of the radio frequency signal as effective values. The step of calculating the real-time load power of the target treatment area based on the detection signal of the detection unit includes: Based on the detected positive peak voltage and the reverse peak voltage, the load impedance of the target treatment area is calculated, and the load impedance includes real impedance and virtual impedance; The real-time load power of the target treatment area is calculated based on the forward peak voltage, the reverse peak voltage, and the actual impedance of the load impedance.

5. The method as described in claim 4, characterized in that, The step of calculating the real-time load power of the target treatment area based on the forward peak voltage, the reverse peak voltage, and the real impedance of the load impedance includes: Based on the calculation formula for load power, the real-time load power of the target treatment area is calculated. The calculation formula for load power is as follows: 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 forward peak voltage phase detected by the directional coupler and the reverse peak voltage phase detected by the directional coupler.

6. The method as described in claim 1, characterized in that, The radio frequency control circuit for skin treatment further includes an RF power regulator, which includes a PID controller and a digital-to-analog converter. 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 a constant power output to the target treatment area includes: 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; When the difference is greater than a preset difference, the PID controller is controlled to send a PID control signal to the digital-to-analog converter according to the preset PID control parameters; 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 the preset PID control parameters.

7. A radiofrequency control circuit for skin treatment, characterized in that, The radiofrequency control circuit for skin treatment is applied to the radiofrequency control method for skin treatment as described in any one of claims 1 to 6. The radiofrequency control circuit includes: an impedance matching unit, a radiofrequency power supply, a detection unit, and a control unit. The control unit is connected to the controlled terminal of the impedance matching unit, the detection terminal of the detection unit, and the controlled terminal of the radiofrequency power supply. The output terminal of the radiofrequency power supply is connected to the input terminal of the detection unit. The output terminal of the detection unit is connected to the input terminal of the impedance matching unit. The output terminal of the impedance matching unit is connected to an electrode in one of a plurality of target treatment areas. The impedance matching unit is used to perform impedance matching on the target treatment region under the control of the control unit when a pilot signal is applied to one of a plurality of target treatment regions. The detection unit is used to detect radio frequency signals and output detection signals to the control unit; The control unit is used to control the impedance matching unit to perform impedance matching with the target treatment area; in the impedance matching state, the output voltage of the radio frequency power supply is controlled according to the preset constant power, the real-time load power of the target treatment area is calculated according to the detection signal of the detection unit, and the output voltage of the radio frequency power supply is adjusted based on the difference between the real-time load power and the preset constant power to maintain a constant power output to the target treatment area. The radio frequency power supply is used to adjust the output voltage according to the control unit to maintain a constant power output to the target treatment area.

8. The radiofrequency control circuit for skin treatment as described in claim 7, characterized in that, The impedance matching unit includes X parallel impedance matching networks and X relays, with each impedance matching network connected in series with a corresponding relay. The controlled terminal of each relay is connected to the control unit, and X is greater than or equal to 2.

9. A radiofrequency control device for skin treatment, characterized in that, Includes the radiofrequency control circuit for skin treatment as described in claim 8.

10. A radiofrequency control device for skin treatment, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the radiofrequency control method for skin treatment as claimed in any one of claims 1 to 7.

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