Skin treatment apparatus and control method thereof

Abstract

The skin treatment device of the present invention comprises: a radio frequency (RF) generator for generating RF energy; an electrode for transmitting the RF energy to a skin tissue of a user; a measurement unit for measuring a forward RF voltage caused by the RF energy and a reverse RF voltage caused by the RF energy reflected to the RF generator; and a controller for calculating a skin impedance and an RF energy efficiency of the user based on the measured forward RF voltage and the reverse RF voltage, and controlling an output of the RF generator based on the calculated skin impedance and the RF energy efficiency.

Description

Technical Field

[0001] The present invention relates to a skin treatment device and a control method thereof, and in particular to a skin treatment device and a control method thereof that measures output power efficiency and impedance in real time according to skin impedance in an RF treatment device. Background Art

[0002] Recently, RF treatment, which delivers radiofrequency energy by inserting needle-shaped electrodes into skin tissue, has been widely used to treat skin lesions, such as wrinkle removal, scar removal, and acne treatment.

[0003] RF treatment methods utilize the principle that when RF current is supplied to tissue through electrodes, the electrical energy flowing through the tissue is converted into heat, transferring the energy to the tissue. However, even when transmitting RF energy at the same output, the amount of energy delivered can vary depending on the impedance characteristics of the skin (target tissue). Due to these characteristics, when treatment is performed under the same conditions, problems can arise: insufficient energy may be delivered, preventing optimal treatment, or excessive energy may be applied, resulting in tissue damage.

[0004] Therefore, prior art 1 (Patent Publication No. 10-2018-0111202) and prior art 2 (Patent Publication No. 10-2022-0129344) disclose RF treatment devices that deliver RF energy suitable for tissue by considering the impedance characteristics of the tissue.

[0005] However, in prior art 1 and prior art 2, a method for calculating tissue impedance is proposed by measuring the current, voltage, and power applied to electrodes during RF energy application. Specifically, the forward RF current and voltage transmitted to the skin tissue are measured, and the reverse RF current and voltage reflected from the skin tissue are not considered. Consequently, there is a problem in that the impedance of the skin tissue to the RF energy transmitted to the skin tissue may not be accurately calculated. This also presents a limitation in that it may not be possible to measure the impedance of the skin tissue in real time by emitting a predetermined level of RF energy for a predetermined period of time and measuring the flowing current. Summary of the Invention

[0006] Technical issues

[0007] The present invention aims to provide a skin treatment device and a control method thereof for measuring RF output power efficiency and skin impedance in real time in the RF treatment device.

[0008] The present invention aims to provide a skin treatment device and a control method thereof that accurately measures RF output power efficiency and skin impedance by considering forward RF energy output by the RF treatment device and reverse RF energy reflected from skin tissue.

[0009] The present invention is directed to providing a skin treatment device and a control method thereof for controlling the quantitative output of RF energy according to the user's skin characteristics by measuring RF output power efficiency and skin impedance in real time.

[0010] Technical Solution

[0011] One embodiment of the present invention provides a skin treatment device, comprising: a radio frequency (RF) generator for generating RF energy; an electrode for transmitting the RF energy to a user's skin tissue; a measuring unit for measuring a forward RF voltage caused by the RF energy and a reverse RF voltage caused by the RF energy reflected to the RF generator; and a controller for calculating the user's skin impedance and RF output power efficiency based on the measured forward RF voltage and the reverse RF voltage, and controlling the output of the RF generator based on the calculated skin impedance and the RF output power efficiency.

[0012] The controller may include: a data processor for calculating the user's skin impedance and RF output power efficiency based on the measured forward RF voltage and the reverse RF voltage; and an RF controller for controlling the output parameters of the RF energy based on the calculated skin impedance and the RF output power efficiency.

[0013] The measuring unit may be connected to an RF transmission line for transmitting RF energy output by the RF generator to the electrode, and may measure a forward RF voltage caused by the RF energy output by the RF generator and a reverse RF voltage caused by RF energy reflected from a load including skin tissue of the user.

[0014] The measurement unit may include a directional power coupler module.

[0015] The measuring unit may measure the forward RF voltage and the reverse RF voltage as root mean square voltages, respectively.

[0016] The data processor may include: a first analog-to-digital converter and a second analog-to-digital converter, the first analog-to-digital converter and the second analog-to-digital converter are used to convert the forward RF voltage and the reverse RF voltage measured by the measuring unit into digital signals; and a digital processing module, the digital processing module is used to calculate skin impedance and RF output power efficiency based on the converted forward RF voltage and reverse RF voltage.

[0017] The data processor can calibrate the measurement error when the load of the measurement unit is switched to a first load, a second load, and a third load respectively operable as an open circuit (Open), a short circuit (Short), and a load (Load), and can calibrate the measurement error based on the forward voltage (V F ) and reverse voltage (V R ) calculates the skin impedance (Z) as can be based on the forward voltage (V F ) and the reverse voltage (V R ) will RF output power efficiency (P R / P F ) is calculated as Here, Z0 can represent the load value corresponding to the rated load and can be given as 50Ω, P F and P R It can represent forward RF electric power and reverse RF electric power.

[0018] The data processor may calculate temperature changes within the user's skin tissue for each output level of the RF energy based on the calculated skin impedance.

[0019] The controller can control the output parameter of the RF energy based on at least one of the calculated skin impedance, the RF output power efficiency and the temperature change in the skin tissue, and the output parameter of the RF energy can be at least one of the voltage magnitude and output time of the RF energy.

[0020] The skin treatment apparatus may further include a display unit, wherein at least one of the calculated skin impedance of the user and the RF output power efficiency may be output to the display unit.

[0021] Another embodiment of the present invention provides a method for controlling a skin treatment device, comprising: generating RF energy; measuring a forward RF voltage caused by the RF energy and a reverse RF voltage caused by the RF energy reflected to an RF generator; calculating a user's skin impedance and an RF output power efficiency based on the measured forward RF voltage and the reverse RF voltage; and controlling the output of the RF generator based on the calculated skin impedance and the RF output power efficiency.

[0022] Beneficial effects

[0023] According to the embodiment of the present invention, the following effects can be achieved.

[0024] According to at least one embodiment of the present invention, a skin treatment device and a control method thereof for measuring RF output power efficiency and skin impedance in real time in the RF treatment device can be provided.

[0025] According to at least one embodiment of the present invention, a skin treatment device and a control method thereof can be provided that accurately measures RF output power efficiency and skin impedance by considering forward RF energy output by the RF treatment device and reverse RF energy reflected from skin tissue.

[0026] According to at least one embodiment of the present invention, a skin treatment device and a control method thereof can be provided for measuring RF output power efficiency and skin impedance in real time and controlling quantitative output RF energy according to user skin characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A block diagram illustrating a configuration of a skin treatment device according to one embodiment.

[0028] Figure 2 A block diagram illustrating a detailed configuration of a skin treatment device according to one embodiment.

[0029] Figure 3 A circuit diagram illustrating an example of a directional power coupler according to one embodiment is shown.

[0030] Figure 4 A graph showing real-time changes in skin impedance and RF output power efficiency according to one embodiment.

[0031] Figure 5 An operational flow chart of a method for controlling a skin treatment device according to one embodiment is shown. DETAILED DESCRIPTION

[0032] The embodiments disclosed in this specification will be described in detail with reference to the accompanying drawings. In this specification, the same or similar parts will be represented by the same or similar figure marks, and their repeated descriptions will be omitted. The component terms "module" and "unit" used in the following description are only used to make the specification easier to understand, and therefore, these terms themselves have no meaning or function to distinguish them from each other. When describing the embodiments of this specification, when it is determined that the detailed description of the known technology associated with the present invention may obscure the main points of the present invention, its description will be omitted. The drawings are provided only to make the embodiments disclosed in this specification easy to understand and should not be construed as limiting the spirit disclosed in this specification, and it should be understood that the present invention includes all modifications, equivalent forms and alternative forms without departing from the scope and spirit of the invention.

[0033] Terms including ordinal numbers (such as first, second, etc.) are only used to describe various components and should not be interpreted as limiting these components. These terms are only used to distinguish one component from other components.

[0034] It should be understood that when a component is referred to as being “connected” or “coupled” to another component, it may be directly connected or coupled to the other component, or may be connected or coupled to the other component through an intermediate component. On the other hand, it should be understood that when a component is referred to as being “directly connected or coupled” to another component, it may be connected or coupled to the other component without using an intermediate component.

[0035] A skin treatment device and a control method thereof according to one embodiment will now be described in detail with reference to the accompanying drawings.

[0036] Figure 1 A block diagram illustrating a configuration of a skin treatment device 100 according to one embodiment.

[0037] Reference Figure 1 , the skin treatment device 100 may include an RF generator 110 , an electrode 120 , a measurement unit 130 , and a controller 140 .

[0038] Figure 1 The components shown in are not necessary to implement the skin treatment device 100, and thus the skin treatment device 100 described in this specification may have more or fewer components than those described above.

[0039] The RF generator 110 may receive a power supply voltage from a power supply (not shown) and may generate RF energy. The RF energy output by the RF generator 110 may have a variable voltage level and output time.

[0040] The electrode 120 may transmit the RF energy generated by the RF generator 110 to the user's skin tissue. The electrode 120 may have at least one or more needle shapes and may transmit the RF energy to a point in the user's skin tissue through one end of the needle.

[0041] The measuring unit 130 may be connected to the RF transmission line between the RF generator 110 and the electrode 120, and may measure a forward RF voltage caused by the RF energy output by the RF generator 110 and a reverse RF voltage caused by the RF energy reflected to the RF generator 100. According to one embodiment, the measuring unit connected to the RF transmission line may include a directional power coupler module.

[0042] The controller 140 can calculate the user's skin impedance and RF output power efficiency in real time by using the forward RF voltage and the reverse RF voltage measured by the measuring unit 130, and can control the output of the RF generator 110. That is, the controller 140 can control output parameters based on the calculated skin impedance and RF output power efficiency, and the output parameters include the voltage level and output time of the RF energy output by the RF generator 110.

[0043] The skin treatment apparatus 100 may further include a display unit 150 for outputting information processed by a device.

[0044] The display unit 150 may also display information about the execution screen of an application program driven by the skin treatment device 100, a user interface (UI) following the execution screen information, and graphical user interface (GUI) information. For example, the display unit 150 may output, in real time, measurement information including skin impedance and RF output power efficiency, as well as processing information including output parameters of RF energy.

[0045] The display unit 150 may have a touch screen for receiving a user's instruction and outputting measurement information and processing information in real time, but is not limited thereto.

[0046] Figure 2 A block diagram illustrating a detailed configuration of a skin treatment device according to one embodiment.

[0047] Regarding the RF treatment device, a portion of the RF energy output by the RF generator 210 may be reflected by a load including skin tissue and may be transmitted to the RF generator. Therefore, the skin treatment device according to one embodiment provides a method for taking into account the reverse RF energy supplied to the RF generator and accurately calculating the RF energy transmitted to the actual skin and the skin impedance.

[0048] Reference Figure 2 The measuring unit 230 of the skin treatment device can be connected to the RF transmission line between the RF generator 210 and the electrode 220, and can measure the forward RF voltage (V F ) and the reverse RF voltage (V R According to one embodiment, the measuring unit 230 may include a directional power coupler module 231 for measuring the forward RF voltage (V F ) and reverse RF voltage (V R ).

[0049] Directional power couplers can be used to measure impedance mismatches in RF transmission lines. They have a forward transmission path and a coupled transmission path. This configuration allows for measurement of the voltage caused by forward RF energy flowing from the RF source to the load (forward voltage) and the voltage caused by reverse RF energy reflected from the load back to the source (reverse voltage).

[0050] Figure 3 An example of a directional power coupler installed in a skin treatment device according to one embodiment is shown.

[0051] Reference Figure 3, the forward RF voltage (V F ) can be measured by the coupled forward port 301. The reverse RF energy reflected from the load including the skin tissue and input to the RF output port 320 can be measured at the coupled reverse port 302 as a reverse RF voltage (V R ). Figure 3 The internal load shown is used to measure the forward RF voltage (V F ) and reverse RF voltage (V R ) and in one embodiment of the present invention it may be given as 50Ω, but is not limited thereto. Figure 3 The loads shown in may represent loads including skin tissue.

[0052] Reference Figure 2 , the controller 240 of the skin treatment device may include a data processor 250 and an RF controller 260 .

[0053] The data processor 250 may include a first analog-to-digital converter (ADC1) 251a and a second analog-to-digital converter (ADC2) 251b for converting the forward RF voltage (V F ) and reverse RF voltage (V R ) is represented as a numeric value.

[0054] The forward RF voltage (V F ) and reverse RF voltage (V R ) can be an alternating current (AC) signal. The magnitude and direction of an AC signal change periodically over time, so the instantaneous value, maximum value, average value, peak-to-peak (PP) value, or root mean square (RMS) value can be used to represent the magnitude of the AC signal as a number.

[0055] According to one embodiment, the alternating current (AC) voltage caused by the forward RF energy and the reverse RF energy may be measured as a root mean square (RMS).

[0056] The RMS value is a method of measuring AC voltage as a DC voltage or digital value based on the principle that the energy dissipated in the resistance of a DC circuit is equal to the energy dissipated in an AC circuit with the same resistance. This can be done by using the maximum value of the AC voltage (V m ) to calculate the RMS AC voltage (V rms ), as shown in Equation 1.

[0057] (Equation 1)

[0058]

[0059] Reference Figure 2The data processor 250 may also include a digital signal processing (DSP) module 252 for using the forward RF voltage (V F ) and reverse RF voltage (V R ) to calculate skin impedance and RF energy efficiency.

[0060] The calculation of skin impedance according to the present specification may be based on a Short Open Load (SOL) calibration algorithm used by a vector network analyzer (VNA).

[0061] In detail, the method for calculating skin impedance using the SOL calibration algorithm is as follows. Figure 2 and Figure 3 The measurement unit 230 and the controller 240 may be implemented using a vector network analyzer.

[0062] Depend on Figure 3 The forward voltage measured by the coupled forward port 301 may be defined as X, the reverse voltage measured by the coupled reverse port 302 may be defined as Y, and the impedance of the skin corresponding to the load may be defined as Z.

[0063] Before measuring skin impedance, the load can be switched to a first load, a second load, and a third load that can be operated as open circuit (Open), short circuit (Short), and load (Load) respectively within the corresponding frequency bandwidth, and the measurement error of the vector network analyzer can be calibrated.

[0064] In this regard, the forward voltage X1 and reverse voltage Y1 can be measured in an open circuit with an open load value, and the forward voltage X2 and reverse voltage Y2 can be measured in a short circuit with a short load value. The forward voltage X3 and reverse voltage Y3 can be measured in a circuit with a rated load value of 50Ω.

[0065] DSP module 252 can be Figure 3 Measure the forward voltage (V F ) and reverse voltage (V R ), that is, the forward voltage (V F ) and reverse voltage (V R ).

[0066] In connection with this, the vector network analyzer can be calibrated using the forward voltages X1 to X3 and the reverse voltages Y1 to Y3 measured by the above method, and the skin impedance Z can be calculated.

[0067] Reference Figure 3, measure the forward voltage (V F ) and reverse voltage (V R ). The load impedance corresponds to the skin impedance Z at the load point connected to the output point of the vector network analyzer. Therefore, assuming that the vector network analyzer is a transmission line, the forward voltage (V F ) and reverse voltage (V R ), calculate the skin impedance Z at the output point of the transmission line, as shown in Equation 2.

[0068] (Equation 2)

[0069]

[0070] In connection with this, Z0 is a load value corresponding to the rated load and can be set to 50Ω. V F corresponds to the forward voltage measured at the coupled forward port 301, V R corresponds to the reverse voltage measured at the coupled reverse port 302 .

[0071] The measured forward voltage (V F ), reverse voltage (V R ) and the skin impedance Z calculated by equation 2 to calculate the forward RF electric power (P F ) and the reverse RF electric power (P R ).

[0072] (Equation 3)

[0073]

[0074] The DSP module 252 can use the forward RF power (P F ) and reverse RF power (P R ) to calculate the RF output power efficiency.

[0075] (Equation 4)

[0076]

[0077] Reference Figure 2 and Figure 3 , the data processor 250 can calculate the skin impedance (Z) and RF output power efficiency (P based on equations 2 to 4 R / P FIn this regard, the data processor 250 may calibrate the measurement error when the load of the measurement unit 230 is switched to the first load, the second load, and the third load, which are respectively operable as an open circuit, a short circuit, and a load. The data processor 250 may calibrate the measurement error based on the forward voltage (V F ) and reverse voltage (V R ) to use Calculate the skin impedance (Z). The data processor 250 can be based on the forward voltage (V F ) and reverse voltage (V R ) to use Calculate the RF output power efficiency (P R / P F Here, Z0 is the load value corresponding to the rated load, which is 50Ω, and P F and P R are forward RF electric power and reverse RF electric power respectively.

[0078] Therefore, the method for calculating skin impedance according to the present invention has the following advantages: it allows the calculation of the skin impedance based on the forward voltage (V F ) and reverse voltage (V R ) can perform a fast and accurate calculation as shown in Equation 2 without requiring a complicated operation procedure. In particular, the measurement error of the measurement system can be calibrated by using the first to third loads having a standard configuration of open circuit, short circuit, and load, and the skin impedance can be calculated quickly and accurately.

[0079] Regardless of the length error from the needle entering the skin to the input point of the measurement unit, the forward voltage (V F ) and reverse voltage (V R )Calculate skin impedance.

[0080] Figure 4 Graphs showing skin impedance and RF output power efficiency over time according to one embodiment are shown.

[0081] The skin treatment device can measure the changes in skin impedance and RF output power efficiency over time for each RF energy output time (i.e., pulse duration (e.g., 120Ms)). The measured changes in skin impedance and RF output power efficiency can be output to the display unit of the skin treatment device in real time.

[0082] In this way, the user of the RF processing device can monitor the skin impedance characteristics of each user in real time and control the output of RF energy. In other words, by adjusting the output time or voltage of RF energy, the RF energy can be quantitatively applied according to the user's skin impedance.

[0083] The skin impedance and RF output power efficiency calculated in real time using the above method can be stored in real time in a memory (not shown) further included in the skin treatment device. The skin impedance characteristics of each user can be obtained based on the skin impedance and RF output power efficiency stored in the memory, which can help quantitatively irradiate RF energy based on the user's skin impedance characteristics.

[0084] Although not shown in the drawings, temperature changes in the user's skin can be monitored in real time based on the skin impedance and RF output power efficiency calculated by the above method.

[0085] Reference Figure 2 According to one embodiment, the RF controller 260 of the skin treatment device can control the output of RF energy from the RF generator 210 based on the calculated skin impedance and RF output power efficiency. In other words, the RF controller 260 can automatically control the output parameters of the RF energy from the RF generator 210 according to predetermined conditions based on the calculated skin impedance and RF output power efficiency for each user.

[0086] For example, when the calculated RF output power efficiency is less than a predetermined threshold, the RF energy output time or the RF energy voltage level may be increased by a predetermined value. When the calculated RF output power efficiency is greater than a predetermined threshold, the RF energy output time or the RF energy voltage level may be decreased by a predetermined value. When the RF output power efficiency changes significantly, the RF energy output may be interrupted, but the present invention is not limited thereto.

[0087] Now refer to Figure 5 Describe the basic operation of a skin treatment device.

[0088] The skin treatment device outputs RF energy through an RF generator (S501).

[0089] The RF energy output by the RF generator can be adjusted, thereby changing output parameters such as the voltage and output time of the RF energy. The RF energy output by the RF generator can be transmitted to the user's skin tissue through electrodes connected to the RF transmission line.

[0090] The skin treatment device may measure a forward RF voltage caused by RF energy output from the RF generator and a reverse RF voltage caused by RF energy reflected to the RF generator, respectively (S502).

[0091] The measuring unit of the skin treatment device can be connected to the RF transmission line between the RF generator and the electrode and can measure the forward RF voltage caused by the forward RF energy output by the RF generator. The measuring unit can measure the reverse RF voltage caused by the RF energy reflected from the load including the user's skin tissue.

[0092] A measurement unit according to one embodiment may include a directional power coupler module for measuring forward RF voltage and reverse RF voltage. A directional power coupler is a module used by a circuit for measuring impedance mismatch in an RF transmission line and has a forward transmission path and a coupled transmission path. This configuration allows for measurement of the voltage caused by forward RF energy flowing from an RF source to a load (or forward voltage) and the voltage caused by reverse RF energy reflected from the load to the source (or reverse voltage).

[0093] The skin treatment device calculates skin impedance and RF output power efficiency based on the measured forward RF voltage and reverse RF voltage (S503).

[0094] The forward RF voltage and reverse RF voltage measured by the directional power coupler of the measurement unit can be alternating current (AC) signals. Therefore, the forward RF voltage and reverse RF voltage measured as AC signals can be sampled as digital signals by the first analog-to-digital converter module and the second analog-to-digital converter module, and they can be calculated as root mean square (RMS). The RMS is a value obtained by measuring an AC voltage as a DC voltage or a digital value based on the following principle: the electrical energy consumed in the resistance of a DC circuit is equal to the electrical energy consumed in an AC circuit with the same resistance. The forward RF voltage and reverse RF voltage measured as RMS can be calculated as skin impedance and RF output power efficiency by the digital signal processing (DSP) module of the controller.

[0095] The DSP module can calculate skin impedance based on the short-open-load (SOL) calibration algorithm used by the vector network analyzer (VNA).

[0096] A method of calculating skin impedance using the SOL calibration algorithm will now be described in detail.

[0097] Before measuring skin impedance, the load may be switched to a first load, a second load, and a third load operable as an open circuit, a short circuit, and a load within a corresponding frequency bandwidth, and a measurement error of the vector network analyzer may be calibrated.

[0098] In this regard, the forward voltage X1 and reverse voltage Y1 can be measured in an open circuit with an open load value, and the forward voltage X2 and reverse voltage Y2 can be measured in a short circuit with a short load value. The forward voltage X3 and reverse voltage Y3 can be measured in a circuit with a rated load value of 50Ω.

[0099] Can measure forward voltage (V F ) and reverse voltage (V R ), that is, the forward voltage (V F) and reverse voltage (V R ). In connection with this, the forward voltages X1 to X3 and the reverse voltages Y1 to Y3 measured by the above method can be used to calibrate the vector network analyzer, and the skin impedance Z can be calculated.

[0100] The DSP module can measure the forward voltage (V F ) and reverse voltage (V R ) and the calculated skin impedance Z to calculate the forward RF electric power (P F ) and the reverse RF electric power (P R The DSP module can be powered by using the forward RF power (P F ) and reverse RF power (P R ) to convert the RF output power efficiency (P R / P F ) is calculated as

[0101] The skin treatment device may control the output parameters of the RF energy based on the calculated skin impedance and RF output power efficiency (S504). Specifically, the controller may adjust the output parameters, including the voltage and output time of the RF energy, based on the calculated skin impedance and RF output power efficiency.

[0102] The present invention described above can be implemented as computer-readable code on a medium having a program recorded thereon. Computer-readable media include any type of recording device that stores data readable by a computer system. Examples of computer-readable media include hard disk drives (HDDs), solid-state drives (SSDs), silicon disk drives (SDDs), ROMs, RAMs, CD-ROMs, magnetic tapes, floppy disks, and optical data storage devices. The computer may also include a controller for the skin treatment device.

[0103] Therefore, the detailed description should not be interpreted as restrictive in any aspect, but as examples. The scope of the present invention needs to be determined by a reasonable analysis of the appended claims, and all changes within the equivalent range are included in the scope of the present invention.

Claims

1. A skin treatment device comprising: A radio frequency (RF) generator, configured to generate RF energy; an electrode for transmitting the RF energy to skin tissue of a user; a measuring unit configured to measure a forward RF voltage caused by the RF energy and a reverse RF voltage caused by the RF energy reflected to the RF generator; as well as A controller is configured to calculate the user's skin impedance and RF output power efficiency based on the measured forward RF voltage and the reverse RF voltage, and control the output of the RF generator based on the calculated skin impedance and the RF output power efficiency.

2. The skin treatment device according to claim 1, wherein The controller includes: a data processor for calculating the user's skin impedance and the RF output power efficiency based on the measured forward RF voltage and the reverse RF voltage; and An RF controller is configured to control an output parameter of the RF energy based on the calculated skin impedance and the RF output power efficiency.

3. The skin treatment device according to claim 1, wherein The measuring unit is connected to an RF transmission line for transmitting RF energy output by the RF generator to the electrode, and measures a forward RF voltage caused by the RF energy output by the RF generator and a reverse RF voltage caused by the RF energy reflected from a load including skin tissue of the user.

4. The skin treatment device according to claim 3, wherein The measurement unit includes a directional power coupler module.

5. The skin treatment device according to claim 3, wherein The measuring unit measures the forward RF voltage and the reverse RF voltage as root mean square voltages, respectively.

6. The skin treatment device according to claim 2, wherein The data processor comprises: a first analog-to-digital converter and a second analog-to-digital converter, the first analog-to-digital converter and the second analog-to-digital converter being configured to convert the forward RF voltage and the reverse RF voltage measured by the measuring unit into digital signals; and A digital processing module is used to calculate skin impedance and RF output power efficiency based on the converted forward RF voltage and reverse RF voltage.

7. The skin treatment device according to claim 6, wherein The data processor calibrates the measurement error when the load of the measurement unit is switched to a first load, a second load, and a third load respectively operable as an open circuit, a short circuit, and a load, based on the forward voltage (V F ) and reverse voltage (V R ) The skin impedance (Z) is calculated as Based on the forward voltage (V F ) and the reverse voltage (V R ) will RF output power efficiency (P R / P F ) is calculated as Here, Z0 represents the load value corresponding to the rated load and is given as 50Ω, P F and P R Indicates forward RF electric power and reverse RF electric power.

8. The skin treatment device according to claim 7, wherein The data processor calculates temperature changes within the user's skin tissue for various output levels of the RF energy based on the calculated skin impedance.

9. The skin treatment device according to claim 8, wherein The controller controls an output parameter of the RF energy based on at least one of the calculated skin impedance, the RF output power efficiency, and a temperature change within the skin tissue, and The output parameter of the RF energy is at least one of a voltage magnitude and an output time of the RF energy.

10. The skin treatment device according to claim 1, further comprising: Display unit, At least one of the calculated skin impedance of the user and the RF output power efficiency is output to the display unit.

11. A method for controlling a skin treatment device, comprising: Generate RF energy; measuring a forward RF voltage caused by the RF energy and a reverse RF voltage caused by the RF energy reflected to the RF generator; calculating the user's skin impedance and RF output power efficiency based on the measured forward RF voltage and the reverse RF voltage; as well as The output of the RF generator is controlled based on the calculated skin impedance and the RF output power efficiency.

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