Skin-attaching induction method of beauty instrument

Abstract

According to the skin-attaching induction method of the beauty instrument, the stable multi-frequency signals are generated through the PID control algorithm, it can be ensured that the voltage signals on the electrodes are stable, and the accuracy and reliability of the signals are improved; detecting each electrode by using the generated multi-frequency signal in a rotation training mode to obtain current effective values under different frequencies; by changing the frequency, measuring the impedance change under different frequencies and analyzing the change of capacitance and resistance, the fitting state of the electrode and the skin and the moisture content are judged.

Description

Technical Field

[0001] The present invention relates to the technical fields of wearable devices, electronic facial masks and electrode load identification, and in particular to a skin-sensing method for a beauty instrument. Background Art

[0002] Facial masks are a very popular conventional skin care product, but the main function of this type of ordinary facial mask is only to hydrate and moisturize. However, with the rise of the concept of precision skin care, electronic facial masks with multiple functions such as muscle lifting and skin conditioning have come into being. Electronic facial masks stimulate the skin through microcurrents to transport the active ingredients in skin care products to the deep layers of the skin, thereby producing more collagen and elastin, thereby achieving the skin care effects of hydrating, moisturizing, brightening, soothing, repairing, lifting and firming.

[0003] Usually, for better skin care, the electronic mask needs to be placed close to the skin so that the skin can absorb it better. However, due to the diversity of the user's face and the structure of the electronic mask, the electronic mask often does not fit the skin well when the user wears it. The current electronic mask does not have the ability to detect the skin fit, or only relies on the current detection method for simple fit detection. The detection accuracy and reliability are insufficient, and detailed information on the fit between the instrument and the skin cannot be provided in real time, resulting in unsatisfactory beauty effects and affecting the user experience. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the present invention provides a skin-sensing method for a beauty instrument, which can determine the oil and moisture content between the machine and the skin, thereby determining the fit between the machine and the skin and the moisture content of the beauty serum, thereby improving the use effect and user satisfaction of the beauty instrument. In addition, the present invention allows any electrode to be used as both a detection electrode and a functional electrode, with flexible detection and applicable to multi-electrode use. By polling to detect whether a loop is formed between the electrodes, multiple detections are achieved to avoid false detections. This method not only improves the accuracy of detection, but also enhances the functionality and flexibility of the device.

[0005] In order to achieve the above object, the present invention provides a skin-sensing method of a beauty instrument, the specific steps of which include:

[0006] Generate a multi-frequency signal, input the multi-frequency signal into the electrode array, and obtain the effective value of the current at different frequencies;

[0007] Calculating impedance values ​​at different frequencies based on the generated multi-frequency signal and the detected current value;

[0008] According to the impedance values ​​at different frequencies, calculate the resistance and capacitance data at the corresponding frequency;

[0009] Analyze the changes in capacitance and resistance to determine the fit between the electrode and the skin.

[0010] Preferably, the multi-frequency signal is formed by adjusting the power supply voltage using a PID algorithm.

[0011] Preferably, the calculation formula of the impedance value Z is:

[0012] |Z|=Vrms / Irms,

[0013] Among them, Vrms is the effective value of voltage, and Irms is the effective value of current.

[0014] Preferably, the resistance calculation formula at the corresponding frequency is:

[0015] Z = R + 1 / (2Πfc),

[0016] Where Z is the impedance value at different frequencies; R is the resistance value at different frequencies, f is the frequency, and c is the capacitance.

[0017] Preferably, the capacitance C of the capacitor is:

[0018] C = εS / d,

[0019] in, ε is the dielectric constant between parallel plates, S is the contact area between parallel plates, and d is the distance between parallel plates.

[0020] Preferably, the calculation formula of the effective value is:

[0021]

[0022]

[0023] Wherein, Vrms is the voltage effective value, Irms is the current effective value, T is the cycle time, i is the instantaneous current value, and v is the instantaneous voltage value.

[0024] The present invention provides a skin-sensing method for a beauty instrument, which has the following beneficial effects compared with the prior art:

[0025] 1. Improve detection accuracy: The present invention realizes accurate detection of skin fit status through multi-frequency impedance measurement and analysis. By calculating the impedance changes at different frequencies, it can effectively distinguish the changes in capacitance and resistance, thereby accurately judging the contact quality between skin and electrode.

[0026] 2. Real-time feedback: This method can monitor the oil and moisture content of the skin in real time, provide instant feedback, and help users adjust their usage to achieve the best beauty results.

[0027] 3. Enhance user experience: Through accurate fit detection, users can better understand the working status and effect of beauty equipment, and improve their satisfaction and confidence in use. Electrodes can also be flexibly configured: In addition, any electrode can be used as both a detection electrode and a functional electrode, which increases the flexibility and applicability of the device and is suitable for beauty equipment with multiple electrode configurations.

[0028] 5. Reduction of false detection: The present invention adopts polling to detect the loop status between the electrodes, which can effectively avoid false detection and improve the reliability and accuracy of detection.

[0029] 6. Multifunctionality: The present invention can not only detect the skin fit status by calculating the changes in capacitance and resistance, but also infer the moisture content of the skin and the change in contact area, thus increasing the versatility of the device.

[0030] 7. Improve beauty effects: Through accurate fit testing and feedback, ensure that the effective ingredients of the beauty serum can fully act on the skin and improve the overall beauty effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A flowchart for analyzing the skin fitting state in a skin fitting sensing method of a beauty instrument provided by the present invention;

[0032] Figure 2 The present invention provides a flow chart of electrode polling detection in a skin-sensing method for a beauty instrument. DETAILED DESCRIPTION

[0033] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0034] like Figure 1 As shown, a method for skin-sensing with a beauty instrument comprises the following specific steps:

[0035] Generate a multi-frequency signal, input the multi-frequency signal into the electrode array, and obtain the effective value of the current at different frequencies;

[0036] Calculating impedance values ​​at different frequencies based on the generated multi-frequency signal and the detected current value;

[0037] According to the impedance values ​​at different frequencies, calculate the resistance and capacitance data at the corresponding frequency;

[0038] Analyze the changes in capacitance and resistance to determine the fit between the electrode and the skin.

[0039] Specifically, the present invention uses a PID algorithm to control the power supply to generate a sinusoidal voltage signal output to the electrode, thereby ensuring that the voltage signal on the electrode is stable and improving the accuracy and reliability of the signal. During operation, the electrode, skin, and current detection resistor are connected in series in a loop, and the current detection resistor is used to detect the current current signal. The current module is built into the current identification module. The voltage and current signals are collected, and the effective values ​​of the collected voltage and current signals are calculated to facilitate subsequent impedance calculations. By changing the frequency, the impedance changes at different frequencies are measured: the changes in capacitance and resistance are analyzed to determine the skin's fit and moisture content. By polling and activating the electrodes and measuring the resistance and capacitance values ​​one by one, the accuracy and reliability of the detection results can be ensured to avoid false detections.

[0040] The beauty instrument energy system used in the present invention comprises: a control module, a power control module, an impedance detection module, a signal processing module and an electrode array.

[0041] Among them, the control module is responsible for the control and data processing of the entire system. The control module manages the signal generation, data collection and analysis process by executing the preset control algorithm. It receives the signal from the impedance detection module and obtains the relevant information of the fitting state through calculation. The power control module is used to provide a stable power supply for the system, especially to provide the required voltage for the signal generation module. It adjusts the output voltage through the PID control algorithm to ensure that the voltage signal on the electrode remains stable and avoids measurement errors caused by voltage fluctuations. The impedance detection module includes: a current detection resistor and related circuits for measuring the impedance between the skin and the electrode. The module is also used to collect voltage and current signals and calculate the effective value. The impedance detection module can also measure at different frequencies and provide the data required for multi-frequency analysis. The signal processing module uses digital signal processing technology to filter and convert the collected signals to ensure that the data input to the main control chip is accurate. The signal processing module can perform real-time analysis and support fast feedback. The electrode array consists of multiple electrodes attached to the user's skin. Each electrode can be used as a detection electrode and a functional electrode in turn. The electrode is activated by polling to measure the impedance change between it and the adjacent electrode.

[0042] Among them, the operation process of the beauty instrument is as follows:

[0043] After the system is started, the power control module supplies power to each module. The control module generates and outputs a stable sine wave signal by controlling the power module. The impedance detection module collects voltage and current signals, and the control module processes and analyzes the data. Based on the test results, the user can adjust the use of the beauty instrument to achieve the best effect.

[0044] like Figure 2 As shown, the process of conducting round-robin detection on electrodes is as follows:

[0045] Connect the multi-frequency signal input end to any electrode from 1 to n, and the signal output end to any other electrode. For example, if the signal input link clicks X, the signal output will connect to the electrodes other than X. Similarly, each electrode will be detected in turn.

[0046] An electrical signal is applied to the electrode connected to the signal input end. At this time, the signal input end is positive and the signal detection end is negative. After passing through the skin, a loop is formed with the beauty solution; the signal detection end detects the effective value of the current in the loop.

[0047] In this embodiment, the impedance value under uneven frequency is calculated based on the voltage effective value of the generated multi-frequency signal and the current effective value obtained by polling the detection electrode. Specifically:

[0048] The effective value (RMS) is the square root of the average value of the square of the signal. For a periodic signal, the effective value can be calculated using the following formula:

[0049]

[0050]

[0051] Then the impedance |Z|=Vrms / Irms is calculated, where Vrms is the effective value of voltage, Irms is the effective value of current, T is the cycle time, i is the instantaneous current value, and v is the instantaneous voltage value.

[0052] Calculate the corresponding resistance and capacitance values ​​for the impedance value Z at different frequencies. The impedance calculation formula is:

[0053] Z = R + 1 / (2Πfc),

[0054] Where Z is the impedance value at different frequencies; R is the resistance value at different frequencies, f is the frequency, and c is the capacitance. The impedance Z is known, and the resistance value R at different frequencies is a fixed value (only two frequencies need to be tested to calculate, multiple frequencies are also possible, and the average value obtained by calculation can ensure the accuracy of the capacitance calculation). When the impedance of the two frequencies is different, it means that there is a capacitor in the circuit. Based on the known frequency and impedance, since Z = R + 1 / (2Πfc), the current resistance and capacitance can be calculated.

[0055] Analysis of moisture and contact:

[0056] Since water is a good conductor, the change in resistance can reflect the change in water content. The dielectric of the beauty liquid can affect the capacitance characteristics. Since the capacitance C = εS / d, where ε is the dielectric constant of the parallel plate, S is the contact area of ​​the parallel plate, and d is the distance between the parallel plates, the change in capacitance can sensitively reflect the change in the distance and contact area between the skin and the electrode.

[0057] Based on multi-frequency impedance measurement and analysis, accurate detection of skin fit is achieved. By calculating the impedance changes at different frequencies, the changes in capacitance and resistance can be effectively distinguished, thereby accurately judging the contact quality between the skin and the electrode.

[0058] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

Claims

1. A skin-sensing method for a beauty instrument, characterized in that: The specific steps include: Generate a multi-frequency signal, input the multi-frequency signal into the electrode array, and obtain the effective value of the current at different frequencies; Calculating impedance values ​​at different frequencies based on the generated multi-frequency signal and the detected current value; According to the impedance values ​​at different frequencies, calculate the resistance and capacitance data at the corresponding frequency; Analyze the changes in capacitance and resistance to determine the fit between the electrode and the skin.

2. The skin-sensing method of beauty instrument according to claim 1, characterized in that: The multi-frequency signal is formed by adjusting the power supply voltage using a PID algorithm.

3. The skin-sensing method of beauty instrument according to claim 1, characterized in that: The calculation formula of the impedance value Z is: |Z|=Vrms / Irms, Among them, Vrms is the effective value of voltage, and Irms is the effective value of current.

4. The skin-sensing method of beauty instrument according to claim 1, characterized in that: The resistance calculation formula at the corresponding frequency is: Z = R + 1 / (2Πfc), Where Z is the impedance value at different frequencies; R is the resistance value at different frequencies, f is the frequency, and c is the capacitance.

5. The skin-sensing method of beauty instrument according to claim 1, characterized in that: The capacitance C of the capacitor is: C = εS / d, Among them, ε is the dielectric constant between the parallel plates, S is the contact area of ​​the parallel plates, and d is the distance between the parallel plates.

6. The method for skin-sensing with a beauty instrument according to claim 1, characterized in that: The calculation formula of the effective value is: Wherein, Vrms is the voltage effective value, Irms is the current effective value, T is the cycle time, i is the instantaneous current value, and v is the instantaneous voltage value.

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