Temperature detection method, system and radio frequency beauty instrument based on skin impedance

Abstract

The present disclosure provides a temperature detection method, system, and radio frequency beauty device based on skin impedance. The electrode head of the radio frequency beauty device includes multiple electrodes arranged in an array, and the multiple electrodes include at least two groups of electrode pairs. The method includes: determining N sub-regions of the dot matrix formed by the multiple electrodes, wherein the N sub-regions include a first sub-region; obtaining the skin impedance value detected in each sub-region; determining difference information, wherein the difference information includes the difference between the skin impedance value detected in the first sub-region and the skin impedance value detected in each sub-region; determining a target sub-region within the N sub-regions based on the temperature value of the first sub-region and the difference information; the temperature value of the target sub-region is greater than or equal to a first threshold value, and the first threshold value is greater than or equal to the temperature value of the first sub-region. The temperature detection method provided by the present application can improve the flexibility of temperature detection in the beauty device.

Description

Technical Field

[0001] The present disclosure relates to the technical field of beauty instruments, and in particular to a temperature detection method and system based on skin impedance, and a radio frequency beauty instrument. Background Art

[0002] A radio frequency beauty device is an instrument that uses radio frequency energy with a specific waveform to act on human skin. When in use, the radio frequency output electrodes act on the human skin to generate radio frequency current, causing conduction current and displacement current to flow through the skin, forming internal heating, thereby achieving the effect of skin care.

[0003] When the radio frequency current passes through the epidermis and reaches the dermis and is blocked by the resistance of cell tissue, the high-frequency oscillation generates heat energy to denature the collagen in the dermis, thereby stimulating the body's healing mechanism and allowing elastic fiber cells to produce new collagen.

[0004] Collagen is the main substance in the dermis of the skin. The temperature range for collagen reorganization and regeneration is 45℃-55℃, while the human epidermis will show signs of burns when the temperature is above 43℃. Skin damage is an exponential function of temperature, and it is challenging to reach the maximum critical value within the temperature range without damaging the skin.

[0005] In the relevant art, radio frequency beauty devices require advanced temperature control technology to fully realize their anti-wrinkle and skin-tightening effects, and to prevent burns to the skin's epidermis during radio frequency energy output. However, when radio frequency beauty devices have multiple electrodes, temperature imbalances may occur across them. Therefore, multiple temperature sensors are required to detect the temperature of each electrode. Therefore, when radio frequency beauty devices have a single temperature sensor, improving the accuracy of temperature detection becomes a critical issue that needs to be addressed. Summary of the Invention

[0006] To overcome the problems existing in the related art, the embodiments of the present disclosure provide a temperature detection method, system and radio frequency beauty instrument.

[0007] In a first aspect, the present application provides a temperature detection method based on skin impedance, which is applied to a radio frequency beauty instrument, wherein the electrode head of the radio frequency beauty instrument includes a plurality of electrodes arranged in an array, and the plurality of electrodes include at least two groups of electrode pairs. The method includes: determining N sub-areas of the dot matrix formed by the plurality of electrodes, the N sub-areas including a first sub-area; obtaining the skin impedance value detected in each of the sub-areas; determining difference information, the difference information including the difference between the skin impedance value detected in the first sub-area and the skin impedance value detected in each of the sub-areas; determining a target sub-area in the N sub-areas based on the temperature value of the first sub-area and the difference information; the temperature value of the target sub-area is greater than or equal to a first threshold value, and the first threshold value is greater than or equal to the temperature value of the first sub-area.

[0008] In a second aspect, the present application provides a temperature detection method based on skin impedance, which is applied to a radio frequency beauty instrument, wherein the electrode head of the radio frequency beauty instrument includes a plurality of electrodes arranged in an array, and the plurality of electrodes include at least two groups of electrode pairs, and the method includes: obtaining the skin impedance value detected by each group of the electrode pairs and the temperature value of the first electrode pair; the first electrode pair belongs to the at least two groups of electrode pairs; the electrode pair includes a positive electrode and a negative electrode; determining difference information, the difference information including the difference between the skin impedance value detected by the first electrode pair and the skin impedance value detected by each group of the electrode pairs; based on the temperature value of the first electrode pair and the difference information; determining a target electrode pair in the at least two groups of electrode pairs, the temperature of the target electrode pair being greater than or equal to a second threshold value, and the second threshold being greater than or equal to the temperature of the first electrode pair.

[0009] In a third aspect, the present application provides a temperature detection system based on skin impedance, comprising: a radio frequency circuit, an electrode driving circuit, an electrode switching circuit and a microcontroller unit, wherein the microcontroller unit is used to execute any of the temperature detection methods described above.

[0010] In a fourth aspect, the present application provides a radio frequency beauty instrument, comprising a memory and a processor; the memory is used to store computer instructions; and the processor is used to execute any of the temperature detection methods described above.

[0011] Based on the temperature detection method provided in this application, when the temperatures of multiple electrodes of a beauty device are uneven, N sub-regions of the dot matrix formed by the multiple electrodes are determined, and the N sub-regions include the first sub-region; the skin impedance value detected in each sub-region is obtained; and difference information is determined, where the difference information includes the difference between the skin impedance value detected in the first sub-region and the skin impedance value detected in each sub-region. In this way, when identifying an abnormal temperature area, it is not necessary to set a temperature sensor in each sub-region. Only one temperature sensor needs to be set in the first sub-region to obtain the temperature value of the first sub-region. Based on the temperature value of the first sub-region and the difference information, a target sub-region is determined from the N sub-regions; the temperature value of the target sub-region is greater than or equal to a first threshold, and the first threshold is greater than or equal to the temperature value of the first sub-region. Thus, the accuracy of the temperature detection of the beauty device is improved.

[0012] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0014] Figure 1 A flow chart of a temperature detection method provided in an embodiment of the present disclosure.

[0015] Figure 2 This is an application scenario diagram of a radio frequency beauty instrument provided in an embodiment of the present disclosure.

[0016] Figure 3 A schematic diagram of the array arrangement of dot matrix electrodes provided in an embodiment of the present disclosure.

[0017] Figure 4 A schematic diagram of the array arrangement of dot matrix electrodes provided in an embodiment of the present disclosure.

[0018] Figure 5 A schematic diagram of a sub-region of a dot matrix electrode provided in an embodiment of the present disclosure.

[0019] Figure 6 A schematic diagram of a skin impedance change curve provided in an embodiment of the present disclosure.

[0020] Figure 7 A schematic diagram of a sub-region of a dot matrix electrode provided in an embodiment of the present disclosure.

[0021] Figure 8 A flow chart of a temperature detection method provided in an embodiment of the present disclosure.

[0022] Figure 9 A schematic diagram of the structure of a temperature detection system provided in an embodiment of the present disclosure.

[0023] Figure 10 A schematic structural diagram of a temperature detection device provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments and the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0025] Radio frequency beauty devices transmit radio frequency energy to deep subcutaneous tissue through electrodes, generating an alternating electromagnetic field at a specific depth under the skin. The alternating electromagnetic field acts on the water molecules in the collagen. The water molecules generate heat during the vibration and rotation process, causing the collagen fibers in the skin tissue to shrink and the local temperature to rise, producing pseudo-trauma. The skin tissue can produce collagen hyperplasia in the pseudo-trauma area.

[0026] Regarding the mechanism of action of radio frequency in the field of beauty, the care effects of radio frequency beauty devices are mostly based on collagen remodeling and accelerated local metabolism. Different temperatures bring different beauty care effects. The temperature of human tissue during treatment is closely related to the final effect.

[0027] Studies have shown that temperatures of 37-44°C can accelerate natural processes such as metabolism; at temperatures of 44-45°C, the conformation of proteins including collagen changes, and cells die; temperatures of 60-70°C can denature lower proteins, coagulate collagen and hemoglobin, and shrink collagen fibers; high temperatures of 90-100°C can cause the formation of extracellular vacuoles, leading to liquid evaporation; temperatures above 100°C can cause tissue carbonization.

[0028] Regarding the effectiveness of radiofrequency beauty treatments and the duration of radiofrequency exposure, the relationship between the effectiveness of beauty treatments and the duration of exposure cannot be ignored. Studies have found that temperatures of 70-90°C for a few milliseconds can cause tissue coagulation, while temperatures of 45°C for a few seconds can cause irreversible damage, and temperatures of 42°C for dozens of minutes can cause the death of most sensitive cells.

[0029] In order to avoid epidermal damage, the temperature of skin tissue during non-invasive radiofrequency should not exceed 40-43°C. By extending the treatment time and maintaining a safe temperature for a longer period of time, the best skin care effect can be achieved more easily and safely.

[0030] This application provides a temperature detection method based on skin impedance, which can improve the accuracy of temperature detection of beauty devices. The temperature detection method provided by the embodiment of the present disclosure is described in detail below.

[0031] The temperature detection method based on skin impedance provided by the embodiment of the present disclosure can be applied to radio frequency beauty devices, see Figure 1 The temperature detection method provided by the present disclosure may include the following steps:

[0032] Step 101: determining N sub-areas of a dot matrix formed by a plurality of electrodes, where the N sub-areas include a first sub-area; and obtaining a skin impedance value detected in each sub-area.

[0033] See also Figure 2 The electrode head includes a plurality of electrodes arranged in an array, and the plurality of electrodes includes at least two groups of electrode pairs. That is, the plurality of electrodes are arranged in a dot matrix, and the shape of the dot matrix includes a rectangular dot matrix or a ring dot matrix. Figure 3 The electrode head of the radio frequency beauty device provided in the embodiments of the present disclosure includes nine electrodes arranged in an array. Each electrode pair consists of two adjacent electrodes from the nine electrodes. The polarity of the adjacent electrodes is opposite. A "+" indicates a positive electrode, and a "-" indicates a negative electrode.

[0034] When the electrodes contact the skin, the skin area acts as a load, and the electrode pair formed by the positive and negative electrodes provides a high-frequency AC signal to the load. For example, a positive electrode "Electrode 1" and a negative electrode "Electrode 4" form an electrode pair. A high-frequency AC signal is generated between Electrode 1 and Electrode 4, transmitting radiofrequency energy to the deep subcutaneous tissue and generating an alternating electromagnetic field at a specific depth below the skin.

[0035] See also Figure 4 The electrode head of the radio frequency beauty instrument includes 9 electrodes arranged in an array. The 9 electrodes include: electrode 1, electrode 2, electrode 3, electrode 4, electrode 5, electrode 6, electrode 7, electrode 8, and electrode 9. The 9 electrodes are arranged in a rectangular array.

[0036] See also Figure 4 In the rectangular array, electrode position 11 corresponds to electrode 1, electrode position 12 corresponds to electrode 2, and electrode position 13 corresponds to electrode 3; electrode position 21 corresponds to electrode 4, electrode position 22 corresponds to electrode 5, and electrode position 23 corresponds to electrode 6; electrode position 31 corresponds to electrode 7, electrode position 32 corresponds to electrode 8, and electrode position 33 corresponds to electrode 9.

[0037] Refer to Table 1, and establish the correspondence between electrode identification, electrode position and electrode working state in advance. In Table 1, "+" indicates that the working state of the electrode is a positive electrode, and "-" indicates that the working state of the electrode is a negative electrode.

[0038] Table 1 Electrode identification, electrode position and electrode working status

[0039] Electrode identification 1 2 3 4 5 6 7 8 9 Electrode location 11 12 13 21 22 23 31 32 33 Electrode working status + - + - + - + - +

[0040] See also Figure 5 , the dot matrix formed by the multiple electrodes is divided into N sub-regions, and the N sub-regions include sub-region 1, sub-region 2, sub-region 3, and sub-region 4. Among them, sub-region 1 includes electrode 1, electrode 2, electrode 4, and electrode 5; sub-region 2 includes electrode 2, electrode 3, electrode 5, and electrode 6; sub-region 3 includes electrode 4, electrode 5, electrode 7, and electrode 8; sub-region 4 includes electrode 5, electrode 6, electrode 8, and electrode 9.

[0041] In actual applications, each sub-area includes at least one set of electrode pairs, each set of electrode pairs includes a positive electrode and a negative electrode, and the current value of the radio frequency current flowing through the positive electrode and the negative electrode can be detected. The skin impedance of each sub-area is calculated based on the dielectric constant of the skin and the current value of the radio frequency current.

[0042] Research has shown that skin impedance is the impedance between electrodes on the skin surface and the conductive tissue within the skin. Skin impedance can be considered a network of resistors and capacitors consisting of a semi-insulating layer and many small conductors (pores). Changes in skin temperature, skin thickness, skin moisture content, and other parameters will cause changes in skin impedance. For short periods of time, skin thickness, skin moisture content, and other parameters remain stable. Figure 6 ,Under the action of radio frequency energy, the skin temperature gradually increases, and as the skin temperature increases, the skin impedance gradually increases.

[0043] See Table 2, the skin impedance value detected in each sub-area, wherein the skin impedance value detected in sub-area 1 is Ω1, the skin impedance value detected in sub-area 1 is Ω2, the skin impedance value detected in sub-area 1 is Ω3, and the skin impedance value detected in sub-area 1 is Ω4.

[0044] Table 2 Sub-areas and corresponding skin impedance values

[0045] Sub-area Sub-area 1 Sub-area 2 Sub-area 3 Sub-area 4 Skin impedance value Ω1 Ω2 Ω3 Ω4

[0046] Step 102: Determine difference information, where the difference information includes the difference between the skin impedance value detected in the first sub-area and the skin impedance value detected in each sub-area.

[0047] See also Figure 7 In the dot matrix electrode provided in the embodiment of the present disclosure, the N sub-regions include sub-region 1, sub-region 2, sub-region 3, and sub-region 4. The first sub-region is sub-region 1, and the difference between the skin impedance value detected in sub-region 1 and the skin impedance value detected in each sub-region is calculated.

[0048] Referring to Table 3, calculate the difference between the skin impedance value detected in subregion 1 and the skin impedance value detected in each subregion. Denote the difference between the skin impedance value detected in subregion 1 and the skin impedance value detected in the i-th subregion as ΔΩ, where ΔΩ = Ω1 - Ωi, where i is a natural number greater than 0.

[0049] Table 3 Differences between sub-areas and corresponding skin impedance values

[0050] Sub-area Sub-area 1 Sub-area 2 Sub-area 3 Sub-area 4 Difference ΔΩ1 ΔΩ2 ΔΩ3 ΔΩ4

[0051] Step 103: determining a target subregion among the N subregions based on the temperature value and difference information of the first subregion; the temperature value of the target subregion is greater than or equal to a first threshold, and the first threshold is greater than or equal to the temperature value of the first subregion.

[0052] In practical applications, the temperature of the first subregion can be determined based on the temperature of the electrodes in the first subregion. For example, subregion 1 includes electrodes 1, 2, 4, and 5. A temperature sensor is used to detect the temperature of electrode 1, and the temperature of the first subregion is determined based on the temperature of electrode 1.

[0053] When a user uses a handheld beauty device for facial treatment, the end faces of the electrodes come into contact with the skin surface. When the electrodes touch the skin, the skin area acts as a load. The electrode pair formed by the positive and negative electrodes provides a high-frequency AC signal to the load, transmitting radiofrequency energy to the deep subcutaneous tissue. The high-frequency oscillation generates heat energy within the skin tissue. Heat is transferred from the skin tissue to the electrodes, and the current real-time temperature of the electrodes indirectly reflects the real-time temperature of the human epidermis.

[0054] See also Figure 6 Skin impedance and temperature are positively correlated. ΔΩ = Ω1 - Ωi < 0 indicates that the skin impedance detected in subregion i is greater than that detected in subregion 1. In this case, the temperature in subregion i is greater than that in subregion 1.

[0055] The following describes in detail how to determine the temperature value of each sub-region.

[0056] Method 1:

[0057] See also Figure 6 Skin impedance and temperature are positively correlated, and within a narrow temperature range, they exhibit a linear relationship. Let the temperature of the first subregion be T1, and the temperature of the i-th subregion be Ti. Then, the temperature of the i-th subregion, Ti = T1 + K(Ω1 - Ωi), where K is a reference coefficient. In this way, the temperature of each of the N subregions can be determined based on the temperature value and difference information of the first subregion.

[0058] In the disclosed embodiment, the temperature value of the first subregion can indirectly reflect the temperature value of the skin region corresponding to the first subregion. To determine the reference coefficient K, multiple sets of values ​​within a preset temperature range can be obtained in advance. The multiple sets of values ​​include temperature values ​​and impedance values ​​corresponding to the temperature values. Numerical fitting is performed on the multiple sets of values ​​to obtain the value of K within the preset temperature range.

[0059] Method 2:

[0060] The skin impedance corresponding to the skin temperature is detected at different skin temperatures to obtain experimental data on skin temperature and skin impedance. A second-order curve is used to numerically fit the parameters in the experimental data. In this way, a skin temperature-skin impedance change curve can be established in advance based on the experimental data.

[0061] See also Figure 6The skin temperature-skin impedance change curve provided by the embodiment of the present disclosure can be used to accurately determine the temperature value of each sub-area. The skin impedance value detected in each sub-area and the skin temperature-skin impedance change curve can be used to determine the skin temperature corresponding to the skin impedance in the skin temperature-skin impedance change curve. In this way, the temperature value of the skin area corresponding to each sub-area can be determined.

[0062] In practical applications, the above steps A101 to A103 can be implemented using a processor, and the above processor can be at least one of an application specific integrated circuit (ASIC), a digital signal processor (DSP), a digital signal processing device (DSPD), a programmable logic device (PLD), a field programmable gate array (FPGA), a central processing unit, a controller, a microcontroller, and a microprocessor.

[0063] In one embodiment, the target sub-region includes a first electrode pair and a second electrode pair; the temperature detection method provided by the embodiment of the present disclosure may further include the following steps:

[0064] Step 201: Acquire a first impedance value and a second impedance value, where the first impedance value is the skin impedance value detected by the first electrode pair; the second impedance value is the skin impedance value detected by the second electrode pair.

[0065] Step 202: Obtain a difference between the first impedance value and the second impedance value.

[0066] Step 203: controlling the working state of the second electrode pair according to the temperature value and the difference of the first electrode pair.

[0067] In one embodiment, the target sub-region includes at least two groups of electrode pairs; the temperature detection method provided by the embodiment of the present disclosure may further include the following steps:

[0068] Step 301: Acquire the skin impedance value detected by each electrode pair; at least two electrode pairs include a first electrode pair.

[0069] Step 302: Determine difference information, where the difference information includes the difference between the skin impedance value detected by the first electrode pair and the skin impedance value detected by each group of electrode pairs.

[0070] Step 303: Based on the temperature value and difference information of the first electrode pair, determine a target electrode pair from at least two groups of electrode pairs, wherein the temperature of the target electrode pair is greater than or equal to a second threshold value, and the second threshold value is greater than or equal to the temperature of the first electrode pair.

[0071] The temperature detection method based on skin impedance provided by the embodiment of the present disclosure can be applied to radio frequency beauty devices, see Figure 8 The temperature detection method provided by the present disclosure may include the following steps:

[0072] Step 401: Acquire the skin impedance value detected by each electrode pair; at least two electrode pairs include a first electrode pair.

[0073] Referring to Table 4, the electrode pairs formed by the positive electrode and the negative electrode include: electrode 1 and electrode 2, electrode 1 and electrode 4, electrode 2 and electrode 3, electrode 2 and electrode 5, electrode 3 and electrode 6, electrode 4 and electrode 5, electrode 4 and electrode 7, electrode 5 and electrode 6, electrode 5 and electrode 8, electrode 6 and electrode 9, electrode 7 and electrode 8, electrode 8 and electrode 9.

[0074] Table 4 Electrode pairs and corresponding skin impedance

[0075]

[0076] Step 402: Determine difference information, where the difference information includes the difference between the skin impedance value detected by the first electrode pair and the skin impedance value detected by each group of electrode pairs.

[0077] Referring to Table 5, the difference between the skin impedance value detected by the first electrode pair and the skin impedance value detected by the i-th electrode pair is recorded as ΔΩ, then ΔΩ=Ω1-Ωi, where i is a natural number greater than 0. Determine the maximum value Ω in the skin impedance value Max and the minimum value Ω Min , get the variance value of skin impedance (Ω Max -Ω Min ) / Ω Max .

[0078] Table 5 Differences between electrode pairs and corresponding skin impedance values

[0079]

[0080] Step 403: Based on the temperature value and difference information of the first electrode pair, determine a target electrode pair from at least two groups of electrode pairs, wherein the temperature of the target electrode pair is greater than or equal to a second threshold value, and the second threshold value is greater than or equal to the temperature of the first electrode pair.

[0081] The following is a detailed introduction on how to determine the temperature value of each electrode pair.

[0082] Method 1:

[0083] See also Figure 6 , the skin impedance value and temperature value are positively correlated. Within a smaller temperature range, the skin impedance value and temperature value are linearly related. The difference between the skin impedance value detected by the first electrode pair and the skin impedance value detected by the i-th electrode pair is denoted as ΔΩ, then ΔΩ=Ω1-Ωi, where i is a natural number greater than 0. The temperature value of the first electrode pair is denoted as T1, and the temperature value of the i-th electrode pair is denoted as Ti, then the temperature value of the i-th electrode pair Ti=T1+K(Ω1-Ωi), where K is a reference coefficient. In this way, the temperature value of each electrode pair in N groups of electrode pairs can be determined based on the temperature value and difference information of the first electrode pair.

[0084] In the disclosed embodiment, the temperature value of the first electrode pair can indirectly reflect the temperature value of the skin area corresponding to the first electrode pair. To determine the reference coefficient K, multiple sets of values ​​within a preset temperature range can be obtained in advance. The multiple sets of values ​​include temperature values ​​and impedance values ​​corresponding to the temperature values. Numerical fitting is performed on the multiple sets of values ​​to obtain the value of K within the preset temperature range.

[0085] Method 2:

[0086] The skin impedance corresponding to the skin temperature is detected at different skin temperatures to obtain experimental data on skin temperature and skin impedance. A second-order curve is used to numerically fit the parameters in the experimental data. In this way, a skin temperature-skin impedance change curve can be established in advance based on the experimental data.

[0087] See also Figure 6 The skin temperature-skin impedance change curve provided by the embodiment of the present disclosure can accurately determine the temperature value of each electrode pair based on the skin impedance value detected by each electrode pair and the skin temperature-skin impedance change curve. The skin temperature corresponding to the skin impedance can be determined in the skin temperature-skin impedance change curve. In this way, the temperature value of the skin area corresponding to each electrode pair can be determined.

[0088] In one embodiment, the temperature detection method provided by the embodiment of the present disclosure may further include the following steps:

[0089] Step 501: Acquire a first impedance value and a second impedance value, where the first impedance value is the skin impedance value detected by the first electrode pair; the second impedance value is the skin impedance value detected by the second electrode pair.

[0090] When the first electrode pair is controlled alone to output radiofrequency energy, the first impedance value is obtained according to the skin impedance value detected by the first electrode pair; when the second electrode pair is controlled alone to output radiofrequency energy, the second impedance value is obtained according to the skin impedance value detected by the second electrode pair.

[0091] Step 502: Obtain a difference between the first impedance value and the second impedance value.

[0092] Step 503: Control the working state of the second electrode pair according to the temperature value and the difference of the first electrode pair.

[0093] In one embodiment, in the temperature detection method provided in the embodiment of the present disclosure, controlling the working state of the second electrode pair according to the temperature value and difference of the first electrode pair may include the following steps: when it is determined that the temperature of the second electrode pair is greater than or equal to a second threshold value according to the temperature value and difference of the first electrode pair, controlling the electrodes of the second electrode pair to be in a suspended state within a preset time length.

[0094] In one embodiment, in the temperature detection method provided by the present disclosure, the first impedance value is the skin impedance value detected by the first electrode pair; the second impedance value is the skin impedance value detected by the second electrode pair. The temperature value and difference of the first electrode pair are data detected during the i-th control period; controlling the operating state of the second electrode pair based on the temperature value and difference of the first electrode pair may include the following steps:

[0095] Step 601: Using the difference between the first impedance value and the second impedance value as an input of a PID controller, and calculating the radio frequency power of the second electrode pair in the (i+1)th control cycle.

[0096] Step 602: Control the working state of the second electrode pair in the (i+1)th control period according to the radio frequency power of the second electrode pair in the (i+1)th control period.

[0097] For example, a PID control method is used, and the difference between the first impedance value and the second impedance value is used as the input of the PID controller to calculate the radio frequency power of the second electrode pair in the (i+1)th control cycle. The PID controller uses the following algorithm formula:

[0098]

[0099] Wherein, Kp is the proportional gain, which is inversely proportional to the proportionality; Tt is the integral time constant; TD is the differential time constant; u(t) is the output signal of the PID controller, for example, the RF power of the second electrode pair in the (i+1)th control cycle; e(t) is the difference between the first impedance value and the second impedance value.

[0100] A PID controller is a linear controller that creates a control deviation between a given value and the actual output value. The proportional (P), integral (I), and differential (D) components of the deviation are linearly combined to form the control variable, controlling the controlled object.

[0101] In one embodiment, the temperature detection method provided by the embodiment of the present disclosure may further include the following steps:

[0102] Step 701: Determine the range of the skin impedance values ​​detected by each electrode pair. Here, the range represents the difference between the maximum and minimum values ​​of the skin impedance values ​​detected by each electrode pair.

[0103] Step 702: When the range difference is greater than a preset threshold, a prompt message is generated, where the prompt message is used to indicate that the temperature of the skin area corresponding to each electrode pair is unbalanced.

[0104] In one embodiment, the temperature detection method provided by the embodiment of the present disclosure may further include the following steps:

[0105] Step 801: Determine N sub-areas of a dot matrix formed by multiple electrodes, and obtain the skin impedance value detected in each sub-area.

[0106] Step 802: Determine the range of the skin impedance values ​​detected in each sub-area. Here, the range represents the difference between the maximum and minimum values ​​of the skin impedance values ​​detected in each sub-area.

[0107] Step 803: When the range difference is greater than a preset threshold, a prompt message is generated, where the prompt message is used to indicate that the temperature of the skin area corresponding to each sub-area is uneven.

[0108] See also Figure 9 The present disclosure provides a temperature detection system based on skin impedance, comprising: a radio frequency circuit, an electrode drive circuit, a detection circuit, an electrode switching circuit, and a microcontroller unit. The detection circuit is configured to detect and obtain the skin impedance value detected by each electrode pair, or the skin impedance value detected by each sub-region, and transmit the skin impedance value detected by each electrode pair, or the skin impedance value detected by each sub-region, to a microprocessor unit. The microprocessor unit is configured to execute the following temperature detection method based on skin impedance:

[0109] Determine N sub-areas of a dot matrix formed by a plurality of electrodes; obtain a skin impedance value detected in each sub-area; the N sub-areas include a first sub-area; determine difference information, the difference information including a difference between the skin impedance value detected in the first sub-area and the skin impedance value detected in each sub-area; determine a target sub-area among the N sub-areas based on the temperature value of the first sub-area and the difference information; the temperature value of the target sub-area is greater than or equal to a first threshold value, and the first threshold value is greater than or equal to the temperature value of the first sub-area.

[0110] See also Figure 10 The present application provides a temperature detection system based on skin impedance, which includes the following unit modules:

[0111] An acquisition module is configured to determine N sub-areas of a dot matrix formed by a plurality of electrodes, the N sub-areas including the first sub-area; and acquire a skin impedance value detected in each sub-area;

[0112] a processing module, configured to determine difference information, the difference information comprising a difference between the skin impedance value detected in the first sub-region and the skin impedance value detected in each sub-region;

[0113] The determination module is used to determine a target sub-region in the N sub-regions according to the temperature value and difference information of the first sub-region; the temperature value of the target sub-region is greater than or equal to a first threshold, and the first threshold is greater than or equal to the temperature value of the first sub-region.

[0114] See also Figure 10 The present disclosure provides a temperature detection system based on skin impedance, which can be applied to a radio frequency beauty instrument. The electrode head of the radio frequency beauty instrument includes a plurality of electrodes arranged in an array, and the plurality of electrodes includes at least two groups of electrode pairs. The device includes the following unit modules:

[0115] an acquisition module, configured to acquire skin impedance values ​​detected by each electrode pair; the at least two electrode pairs including a first electrode pair;

[0116] a processing module, configured to determine difference information, the difference information comprising a difference between the skin impedance value detected by the first electrode pair and the skin impedance values ​​detected by each group of electrode pairs;

[0117] A determination module is used to determine a target electrode pair in at least two groups of electrode pairs based on the temperature value and difference information of the first electrode pair, wherein the temperature of the target electrode pair is greater than or equal to a second threshold value, and the second threshold value is greater than or equal to the temperature of the first electrode pair.

[0118] An embodiment of the present disclosure provides a radio frequency beauty instrument, comprising a memory and a processor; the memory is used to store computer instructions; and the processor is used to execute any of the above-mentioned temperature detection methods based on skin impedance.

[0119] The above description of the various embodiments tends to emphasize the differences between the various embodiments. The same or similar parts can be referenced with each other. For the sake of brevity, they will not be repeated in this article.

[0120] The methods disclosed in the various method embodiments provided in this application can be arbitrarily combined, if they do not conflict, to obtain new method embodiments. The features disclosed in the various product embodiments provided in this application can be arbitrarily combined, if they do not conflict, to obtain new product embodiments. The features disclosed in the various method or device embodiments provided in this application can be arbitrarily combined, if they do not conflict, to obtain new method embodiments or device embodiments.

[0121] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of units is merely a logical function division. In actual implementation, there may be other division methods, such as: multiple units or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0122] The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place or distributed on multiple grid units; some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0123] The functional units in the embodiments of the present application may all be integrated into one processing module, or each unit may be a separate unit, or two or more units may be integrated into one unit; the above-mentioned integrated units may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0124] Those skilled in the art will understand that all or part of the steps for implementing the above-mentioned method embodiments can be accomplished by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps including the above-mentioned method embodiments. The above is only a specific implementation method of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or replacements within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A temperature detection method based on skin impedance, characterized in that: The method is applied to a radio frequency beauty instrument, wherein the radio frequency beauty instrument includes a single temperature sensor, and the electrode head of the radio frequency beauty instrument includes a plurality of electrodes arranged in an array, wherein the plurality of electrodes include at least two groups of electrode pairs. The method includes: obtaining a skin impedance value detected by each group of the electrode pairs and a temperature value of a first electrode pair; the first electrode pair belongs to the at least two groups of electrode pairs; the electrode pair includes a positive electrode and a negative electrode; determining difference information, wherein the difference information includes a difference between the skin impedance value detected by the first electrode pair and the skin impedance value detected by each group of the electrode pairs; and determining a target electrode pair from the at least two groups of electrode pairs based on the temperature value of the first electrode pair and the difference information, wherein the temperature of the target electrode pair is greater than or equal to a second threshold value, and the second threshold value is greater than or equal to the temperature of the first electrode pair. Obtain a first impedance value and a second impedance value, wherein the first impedance value is the skin impedance value detected by the first electrode pair; the second impedance value is the skin impedance value detected by the second electrode pair; obtain the difference between the first impedance value and the second impedance value; and control the working state of the second electrode pair according to the temperature value of the first electrode pair and the difference.

2. The method according to claim 1, characterized in that The method of controlling the working state of the second electrode pair based on the temperature value of the first electrode pair and the difference includes: when it is determined that the temperature of the second electrode pair is greater than or equal to a second threshold value based on the temperature value of the first electrode pair and the difference, controlling the electrodes of the second electrode pair to be in a suspended state within a preset time period.

3. The method according to claim 1, characterized in that The temperature value of the first electrode pair and the difference belong to the data obtained by detection in the i-th control period; controlling the working state of the second electrode pair based on the temperature value and the difference of the first electrode pair includes: taking the difference between the first impedance value and the second impedance value as the input of the PID controller, and calculating the radio frequency power of the second electrode pair in the i+1-th control period; controlling the working state of the second electrode pair in the i+1-th control period based on the radio frequency power of the second electrode pair in the i+1-th control period.

4. The method according to claim 1, wherein The method further includes: determining the range of skin impedance values ​​detected by each group of the electrode pairs; and generating a prompt message when the range is greater than a preset threshold, wherein the prompt message is used to indicate that the temperature of the skin area corresponding to each group of the electrode pairs is uneven.

5. A temperature detection system based on skin impedance, characterized in that: The system comprises: a radio frequency circuit, an electrode driving circuit, an electrode switching circuit and a micro control unit, wherein the micro control unit is used to execute the temperature detection method according to any one of claims 1 to 4.

6. A radio frequency beauty instrument, characterized in that: The radio frequency beauty instrument includes: a memory and a processor; the memory is used to store computer instructions; and the processor is used to execute the temperature detection method according to any one of claims 1 to 4.

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