Voltage regulation circuit of skin care equipment and skin care equipment

Abstract

The utility model discloses a voltage regulation circuit of skin care equipment and the skin care equipment, the voltage regulation circuit of the skin care equipment comprises a power supply management circuit, the first output end of the power supply management circuit is used for being connected with an electrode; the first detection end of the monitoring circuit is electrically connected between the first output end of the power management circuit and the electrode and is used for monitoring the voltage transmitted to the electrode from the first output end of the power management circuit; the main controller is electrically connected with the first feedback end of the power management circuit and the second feedback end of the monitoring circuit, so as to transmit a pulse width modulation signal to the first feedback end of the power management circuit according to a signal fed back by the second feedback end of the monitoring circuit. The pulse width modulation signal is transmitted to the power supply pipeline circuit, so that the power supply pipeline circuit adjusts the voltage transmitted to the electrode according to the pulse width modulation signal, the pulse width modulation signal is utilized to adjust the output voltage of the power supply management circuit, closed-loop control is realized in combination with the monitoring circuit, and the voltage adjustment precision and response speed are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of beauty equipment, and particularly relates to a voltage regulation circuit for a skin care device and a skin care device. Background Art

[0002] Beauty instruments use microcurrent and / or radio frequency current technology to care for the skin, which can effectively promote blood circulation, stimulate the generation of skin collagen, and improve the elasticity and firmness of facial skin. The generation and control of microcurrent in beauty instruments usually rely on boost chips.

[0003] In related technologies, the voltage of the feedback pin (FB pin) of the boost chip is usually adjusted by controlling the on-off frequency of a switching tube (such as a triode). Specifically, the collector of the triode is connected to the feedback pin of the boost chip. By changing the switching frequency of the triode, the voltage of the feedback pin can be pulled down, thereby adjusting the output voltage of the boost chip.

[0004] Although this method of controlling the feedback pin realizes the adjustment of boosting and bucking to a certain extent, it also has obvious defects. Specifically, when the switching tube is turned on, the voltage of the feedback pin will quickly drop to a fixed value. This pulling-down method is relatively direct and the adjustment accuracy is low. Summary of the Utility Model

[0005] The main object of the utility model is to propose a voltage regulation circuit for a skin care device, aiming to solve the problem of low voltage regulation accuracy in related technologies.

[0006] To achieve the above object, the utility model proposes a voltage regulation circuit for a skin care device, which includes:

[0007] A power management circuit, the first output end of the power management circuit is used to connect to an electrode;

[0008] A monitoring circuit, the first detection end of the monitoring circuit is electrically connected between the first output end of the power management circuit and the electrode to monitor the voltage transmitted from the first output end of the power management circuit to the electrode;

[0009] A main controller, the main controller is electrically connected to the first feedback end of the power management circuit and the second feedback end of the monitoring circuit respectively, to transmit a pulse width modulation signal to the first feedback end of the power management circuit according to the signal fed back by the second feedback end of the monitoring circuit, so that the power pipeline circuit adjusts the voltage transmitted to the electrode according to the pulse width modulation signal.

[0010] In some embodiments, the monitoring circuit includes:

[0011] A first voltage divider device, one end of the first voltage divider device is electrically connected to the first detection end, and the other end of the first voltage divider device is grounded;

[0012] A first filtering device, the input end of the first filtering device is electrically connected to the first voltage divider device;

[0013] An analog-to-digital conversion module, one end of the analog-to-digital conversion module is electrically connected to the output end of the first filtering device, and the other end of the analog-to-digital conversion module is electrically connected to the second feedback end;

[0014] Wherein, the first voltage divider device is used for dividing the voltage of the first output end, the first filtering device is used for filtering the electrical signal transmitted to the analog-to-digital conversion module after being divided by the first voltage divider device, and the analog-to-digital conversion module is used for converting the electrical signal output after being filtered by the first filtering device into a digital signal and feeding it back to the main controller.

[0015] In some embodiments, the first voltage divider device includes a first resistor and a second resistor, one end of the first resistor is electrically connected to the first detection end, the other end of the first resistor is electrically connected to one end of the second resistor, the other end of the second resistor is grounded, and the input end of the first filtering device is electrically connected between the first resistor and the second resistor.

[0016] In some embodiments, the first filtering device includes a third resistor and a first capacitor, one end of the third resistor is electrically connected between the first resistor and the second resistor, the other end of the third resistor is electrically connected to one end of the first capacitor and the input end of the analog-to-digital conversion module, and the other end of the first capacitor is grounded.

[0017] In some embodiments, the power management circuit includes:

[0018] A boost circuit, the second output end of the boost circuit is electrically connected to the first output end, the third feedback end of the boost circuit is electrically connected to the first output end, and the third feedback end is used for monitoring the voltage transmitted from the first output end to the electrode;

[0019] A signal receiving circuit, one end of the signal receiving circuit is electrically connected to the third feedback end, and the other end of the signal receiving circuit is electrically connected to the first feedback end;

[0020] Wherein, the signal receiving circuit is used for receiving and processing the pulse width modulation signal of the main controller, and the boost circuit adjusts the voltage transmitted to the electrode based on the processed pulse width modulation signal.

[0021] In some embodiments, the signal receiving circuit includes:

[0022] A second filtering device, an input end of the second filtering device is electrically connected to the first feedback end, and one end of the second filtering device is grounded;

[0023] An impedance matching element, one end of the impedance matching element is electrically connected to the other end of the second filtering device, and the other end of the impedance matching element is connected to the other end of the signal receiving circuit;

[0024] Wherein, when the main controller outputs a pulse width modulation signal, the second filtering device filters the pulse width modulation signal, and the impedance matching element adjusts the pulse width modulation signal to match the voltage monitored at the third feedback end.

[0025] In some embodiments, the boost circuit includes:

[0026] A boost conversion circuit, an output end of the boost conversion circuit is electrically connected to the second output end;

[0027] A boost control chip, a feedback end of the boost control chip is electrically connected to the third feedback end, and an input end of the boost control chip is electrically connected to the boost conversion circuit.

[0028] Wherein, the boost control chip is configured to adjust the voltage output from the boost conversion circuit to the first output end according to the level signal at the third feedback end.

[0029] In some embodiments, the boost conversion circuit includes an inductor and a diode, an input end of the inductor is connected to a power supply, an output end of the inductor is electrically connected to an anode of the diode, and a cathode of the diode is electrically connected to an output end of the boost conversion circuit; the input end of the boost control chip is electrically connected between the inductor and the diode;

[0030] Wherein, the input end of the boost control chip is configured to adjust the voltage output from the boost conversion circuit to the first output end.

[0031] In some embodiments, the voltage regulation circuit of the skin care device further includes a second voltage divider, the second voltage divider is electrically connected between the third feedback end and the first output end and is grounded;

[0032] Wherein, the second voltage divider is configured to obtain a divided voltage of the voltage at the first output end and feedback it to the third feedback end.

[0033] In some embodiments, the second voltage divider includes a fourth resistor and a fifth resistor, one end of the fourth resistor is electrically connected to the first detection end, the other end of the fourth resistor is electrically connected to one end of the fifth resistor, the other end of the fifth resistor is grounded, and the third feedback end is electrically connected between the fourth resistor and the fifth resistor.

[0034] In some embodiments, the second voltage divider further includes a second capacitor. One end of the second capacitor is electrically connected to one end of the fourth resistor, and the other end of the second capacitor is electrically connected to the other end of the second capacitor.

[0035] In some embodiments, the main controller is a main control chip, and the main control chip is configured to control the power management circuit to switch the voltage delivered to the electrode among multiple levels.

[0036] The present utility model further provides a skin care device, which includes an electrode and a voltage regulation circuit of the skin care device as described in the foregoing embodiments. The voltage regulation circuit of the skin care device is electrically connected to the electrode, and the voltage regulation circuit of the skin care device is used to regulate the voltage output by the electrode.

[0037] The beneficial effects of the technical solution of the present utility model are as follows: The first output terminal of the power management circuit is used to be connected to the electrode; the first detection terminal of the monitoring circuit is used to be electrically connected between the first output terminal of the power management circuit and the electrode for monitoring the voltage delivered from the first output terminal of the source management circuit to the electrode; the main controller is respectively connected to the first feedback terminal of the power management circuit and the second feedback terminal of the monitoring circuit for delivering a pulse width modulation signal to the first feedback terminal of the power management circuit according to the signal fed back by the monitoring circuit, so that the power pipeline circuit adjusts the voltage delivered to the electrode according to the pulse width modulation signal. In this way, the output voltage of the power management circuit is regulated by using the pulse width modulation signal output by the main controller, and a closed-loop control is achieved in combination with the monitoring circuit, improving the accuracy and response speed of voltage regulation. Compared with directly inputting a fixed voltage setting signal, the duty cycle of the pulse width modulation signal can be finely adjusted, thereby achieving a higher voltage regulation resolution. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the module electrical connection of the voltage regulation circuit of the skin care device in an embodiment of the present utility model;

[0039] Figure 2 It is a circuit diagram of the voltage regulation circuit of the skin care device in an embodiment of the present utility model;

[0040] Figure 3 It is a schematic diagram of the module electrical connection of the voltage regulation circuit of the skin care device in another embodiment of the present utility model;

[0041] Figure 4 It is a circuit diagram of the voltage regulation circuit of the skin care device in another embodiment of the present utility model.

[0042] Explanation of the reference numerals in the drawings:

[0043] 100. Power management circuit; A1. First output terminal; B1. First feedback terminal; 200. Boost circuit; A2. Second output terminal; B3. Third feedback terminal; 201. Boost conversion circuit; L1. Inductor; D1. Diode; U1. Boost control chip; 300. Signal receiving circuit; 301. Second filtering device; R6. Impedance matching element; 400. Monitoring circuit; B4. First detection terminal; B2. Second feedback terminal; 401. First voltage divider; R1. First resistor; R2. Second resistor; 500. First filtering device; R3. Third resistor; C1. First capacitor; 600. Analog-to-digital conversion module; 700. Main controller; 800. Second voltage divider; R4. Fourth resistor; R5. Fifth resistor; C2. Second capacitor; 900. Electrode.

[0044] The realization, functional features and advantages of the purpose of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0045] Next, the solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0046] It should be noted that all the directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0047] It should also be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time.

[0048] In addition, the descriptions involving "first", "second", etc. in the present utility model are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. Additionally, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0049] Refer to Figure 1 , Figure 1 which is a schematic diagram of the module electrical connection of the voltage regulation circuit of the skin care device in an embodiment of the present utility model.

[0050] An embodiment of the present utility model provides a voltage regulation circuit for a skin care device. The voltage regulation circuit of the skin care device includes:

[0051] A power management circuit 100. The first output terminal A1 of the power management circuit 100 is used to connect to the electrode 900 to output a microcurrent to the electrode 900.

[0052] A monitoring circuit 400. The first detection terminal B4 of the monitoring circuit 400 is electrically connected between the first output terminal A1 of the power management circuit 100 and the electrode 900 to monitor the voltage delivered from the first output terminal A1 of the power management circuit 100 to the electrode 900.

[0053] A main controller 700. The main controller 700 is electrically connected to the first feedback terminal B1 of the power management circuit 100 and the second feedback terminal B2 of the monitoring circuit 400 respectively to deliver a pulse width modulation signal to the first feedback terminal B1 of the power management circuit 100 according to the signal fed back by the second feedback terminal B2 of the monitoring circuit 400, so that the power supply circuit adjusts the voltage delivered to the electrode 900 according to the pulse width modulation signal.

[0054] In this embodiment, the power management circuit 100 is mainly used to boost the input power supply voltage, raising the lower input DC voltage (such as 3V) to a higher output voltage (such as 4V, 5V, 6V, etc.) to meet different skin care requirements. These different voltages may have different skin care effects (for example, different voltages may affect the intensity and penetration depth of the microcurrent).

[0055] As for the devices that the power management circuit 100 can adopt, a boost control chip U1 can be selected, such as SY7304DBC, etc. These chips achieve a stable boost function by controlling the output and shutdown of the current, and cooperate with the peripheral inductor L1, capacitor and diode D1 to complete the entire circuit.

[0056] The monitoring circuit 400 is mainly used in this embodiment to monitor the voltage output from the power management circuit 100 to the electrode 900, and feedback the detected voltage signal to the main controller 700 to ensure that the voltage received by the electrode 900 is consistent with the expected value. Specifically, the devices that can be adopted can be a voltage divider or a voltage sensor, and combined with an analog-to-digital converter (ADC), such as ADS1115, to convert the analog voltage signal into a digital signal that the main controller 700 can process.

[0057] The main controller 700 then outputs a corresponding pulse width modulation (PWM) signal to the feedback terminal of the power management circuit 100 according to the digital signal fed back by the monitoring circuit 400. By adjusting the duty cycle and frequency of the pulse width modulation signal (that is, the PWM signal, which will be described using the PWM signal hereinafter), the main controller 700 can accurately control the output voltage of the power management circuit 100 to ensure that the electrode 900 receives a voltage that meets the nursing requirements. The devices specifically adopted can be a microcontroller (such as STM32, Arduino, etc.), and these microcontrollers can flexibly generate PWM signals and make corresponding adjustments according to the digital signals fed back by the ADC.

[0058] During use, taking the example that the power management circuit 100 defaults to boost the input 3V DC voltage to 4V, and then switches to 5V based on 4V (it should be understood that the parameters such as 3V, 4V, 5V, etc. in this embodiment are only example parameters for facilitating the understanding of the embodiment and do not represent the actual parameters used):

[0059] When the user turns on the skin care device, the power management circuit 100 defaults to boost the input 3V DC voltage to 4V and output it to the electrode 900 through the first output terminal A1 for initial skin care. At this time, the monitoring circuit 400 monitors the output voltage of the power management circuit 100 in real time, and converts the monitored voltage value into a digital signal through the ADC and feeds it back to the main controller 700. The main controller 700 judges whether the current output voltage meets the target value of 4V according to the preset control program; if it is detected that the voltage deviates from the expected value, the main controller 700 will output an adjusted PWM signal to the power management circuit 100 to adjust the output voltage back to 4V to achieve closed-loop control of the voltage.

[0060] In the initial stage, a 4V voltage is used as the pre-care voltage. Through the gentle stimulation of a microcurrent, it can promote the activity of skin cells and open the channels of skin cells, preparing for subsequent deeper care. This stage can not only activate skin cells but also help users gradually adapt to the feeling of the microcurrent, thereby increasing the user's acceptance of subsequent higher-intensity care.

[0061] When the device needs to switch to a higher voltage (such as 5V) for deep care, the user can manually select the corresponding care mode. Of course, the main controller 700 can also automatically switch according to a preset program, that is, after a period of 4V pre-care, when the skin adapts, it is raised to 5V for deeper care. At this time, after receiving the switching instruction, the main controller 700 outputs a new PWM signal to the power management circuit 100. For example, the duty cycle of the PWM signal is adjusted to 70% and the frequency is maintained at 10kHz to boost the input 3V voltage to 5V. The monitoring circuit 400 continues to monitor and feedback the output voltage of the power management circuit 100 to the main controller 700 to ensure that the output voltage is stable at 5V. If there is a deviation between the monitored voltage and the expected value, the main controller 700 will further adjust the PWM signal parameters to keep the voltage stable and continuously achieve closed-loop regulation.

[0062] This gradual care method, after opening the skin cell channels and activating cell functions through the initial 4V pre-treatment, smoothly transitions to 5V deep care, achieving better care effects and user experiences. At the same time, this mode also helps to reduce the irritation of high-voltage care to the skin, making the care process more gentle and comfortable.

[0063] Through the current regulation circuit design of the present utility model, the output voltage of the power management circuit 100 is regulated by using the pulse width modulation (PWM) signal output by the main controller 700, and closed-loop control is achieved in combination with the monitoring circuit 400, significantly improving the accuracy and response speed of voltage regulation. Compared with directly inputting a fixed voltage setting signal, the duty cycle of the pulse width modulation (PWM) signal can be finely adjusted, thereby achieving a higher voltage regulation resolution than traditional methods. And the pulse width modulation (PWM) signal can finely adjust the output voltage with a very small step (subtle duty cycle changes), enabling the voltage to change step by step within a smaller range, which is particularly important for skin care that requires delicate regulation and can precisely adapt to the needs of different skins.

[0064] Furthermore, such a regulation method can be applied not only to the regulation of the voltage of the microcurrent but also to the regulation of the radio frequency (RF) current and voltage based on the same regulation principle of the power management circuit 100.

[0065] Specifically, radio frequency devices usually require a stable high-voltage power supply to drive radio frequency circuits, such as radio frequency amplifiers or oscillators. Through the cooperation of the boost control chip U1 (such as SY7304DBC) and the PWM signal, the power management circuit 100 can precisely adjust the output voltage to meet the voltage requirements of the radio frequency circuit.

[0066] In the radio frequency current regulation application, the power management circuit 100 first boosts the input low voltage to the high voltage required by the radio frequency circuit (such as 12V, 24V, etc.). The monitoring circuit 400 detects the output voltage in real time and feeds it back to the main controller 700. According to the detection results, the main controller 700 outputs a PWM signal to adjust the output of the power management circuit 100 to adapt to the dynamic voltage and current requirements of the radio frequency device. Through closed-loop feedback, the main controller 700 can quickly respond to the instantaneous demand changes of the radio frequency circuit, ensuring precise control of the output voltage and current, and improving the performance and efficiency of the radio frequency device.

[0067] By reasonably configuring the power management circuit 100 and combining the main controller 700 and the monitoring circuit 400, the regulation of radio frequency current and voltage can achieve higher precision and stability. This method is not only applicable to skin care devices but also can be extended to other radio frequency application scenarios that require precise power regulation, such as radio frequency amplifiers, radio frequency care devices, etc.

[0068] Regarding the fact that in the foregoing embodiments, the main controller 700 can automatically switch gears according to a preset program, the main controller is a main control chip, and the main control chip is configured to control the power management circuit 100 to switch the voltage delivered to the electrode 900 between multiple gears.

[0069] Specifically, the main control chip is configured to control the power management circuit 100 to switch the voltage delivered to the electrode 900 between multiple gears, and the specific switching can be achieved by automatically or manually adjusting the voltage gear.

[0070] In the automatic switching mode, a gear switching program is pre-burned in the main control chip for automatically adjusting the voltage delivered to the electrode 900. After the device is started, the main control chip executes voltage switching according to the preset program. For example, initially, the care is performed at 4V by default for 4 - 5 seconds; then it is automatically switched to 5V and the care continues for 4 - 5 seconds; then it is switched to 6V for deeper care.

[0071] That is to say, the main control chip can automatically switch between two, three, or even more than four voltage gears within a care cycle. The switching time of each gear is determined according to the preset program and is not particularly limited. This design can ensure that the voltage is gradually increased according to the skin's acceptance level during the entire care process, thus achieving the best care effect.

[0072] In addition, the gear shifting of the main control chip is not limited to fixed programs and can adjust the program content according to different nursing needs. Users can choose to nurse the skin in a single gear for a long time or in a way of increasing gears one by one. Such a design provides a high degree of flexibility and a customized nursing plan.

[0073] In addition to automatic switching, the device also supports users to independently select gears. Users can switch the voltage gears through adjustment buttons, knobs or touch screens on the device. The manual adjustment method enables users to select the appropriate voltage gear in real time according to personal needs, skin conditions or nursing preferences.

[0074] After the user adjusts the gear, the main control chip will immediately respond and adjust the output voltage of the power management circuit 100, so that the electrode 900 can output the voltage corresponding to the gear. This design not only enhances the flexibility of device use, but also improves the user's participation and sense of control in the nursing process.

[0075] Refer to Figure 2 , Figure 2 which is the circuit diagram of the voltage regulation circuit of the skin care device in an embodiment of the present utility model.

[0076] In this embodiment, the monitoring circuit 400 includes:

[0077] The first voltage divider 401, one end of the first voltage divider 401 is electrically connected to the first detection end B4, and the other end of the first voltage divider 401 is grounded;

[0078] The first filtering device 500, the input end of the first filtering device 500 is electrically connected to the first voltage divider 401;

[0079] The analog-to-digital conversion module 600, one end of the analog-to-digital conversion module 600 is electrically connected to the output end of the first filtering device 500, and the other end of the analog-to-digital conversion module 600 is electrically connected to the second feedback end B2;

[0080] Among them, the first voltage divider 401 is used to divide the voltage of the first output end A1, the first filtering device 500 is used to filter the electrical signal transmitted to the analog-to-digital conversion module 600 after being divided by the first voltage divider 401, and the analog-to-digital conversion module 600 is used to convert the electrical signal output after being filtered by the first filtering device 500 into a digital signal and feedback it to the main controller 700.

[0081] In this embodiment, the monitoring circuit 400 mainly consists of three parts: the first voltage divider 401, the first filtering device 500 and the analog-to-digital conversion module 600. The monitoring circuit 400 is used to accurately measure the voltage output from the power management circuit 100 to the electrode 900 and feedback the measurement result to the main controller 700 to achieve closed-loop control.

[0082] The first voltage divider device 401 is used to divide the voltage input at the first detection terminal B4. Specifically, when the first detection terminal B4 detects that the voltage output from the first output terminal A1 of the power management circuit 100 is 4V, the first voltage divider device 401 divides the 4V voltage into a lower voltage, such as 1V or less. At this time, the proportional relationship between the 1V and the 4V output voltage represents the actual output voltage magnitude through the divided voltage.

[0083] In this embodiment, the main reason for voltage division is to reduce the high-voltage signal to a range suitable for safe measurement by the analog-to-digital conversion module 600 (ADC). Since the analog-to-digital conversion module 600 can usually only process lower voltage inputs (such as 0 - 5V), directly inputting a high voltage may exceed the measurement range of the ADC and even damage the ADC. Therefore, by dividing a higher voltage (such as 4V, 5V) into a lower voltage (such as 1V) through the first voltage divider device 401, not only can the analog-to-digital conversion module 600 be protected, but also ensure that the input signal is accurately converted within its optimal operating range. In addition, the divided low-voltage signal better meets the input requirements of the ADC, ensuring the accuracy and reliability of the measurement.

[0084] The first filtering device 500 is used to filter the electrical signal divided by the first voltage divider device 401 to eliminate noise and high-frequency interference. The filtering process helps to smooth the signal and provides a stable voltage signal for subsequent processing by the analog-to-digital conversion module 600. The input terminal of the first filtering device 500 is electrically connected to the first voltage divider device 401, and the output terminal is connected to the analog-to-digital conversion module 600.

[0085] The analog-to-digital conversion module 600 is responsible for converting the analog voltage signal processed by the first filtering device 500 into a digital signal and feeding it back to the main controller 700 through the second feedback terminal B2. The main controller 700 can use these digital signals to adjust the output of the power management circuit 100 in real time to achieve precise control of the voltage of the electrode 900. One end of the analog-to-digital conversion module 600 is electrically connected to the output terminal of the first filtering device 500, and the other end is connected to the second feedback terminal B2 of the main controller 700. Common analog-to-digital conversion modules 600 such as ADS1115 can provide high-precision voltage measurement and conversion.

[0086] When the first output terminal A1 outputs a 4V voltage to the electrode 900, the first voltage divider device 401 divides the 4V voltage into 1V, forming a processable low-voltage signal to ensure that the voltage safely enters the analog-to-digital conversion module 600. The divided 1V voltage is filtered by the first filtering device 500, and the filtering device removes the high-frequency noise and unstable components in the signal and outputs a stable voltage signal.

[0087] The filtered voltage signal is sent to the analog-to-digital conversion module 600. The module converts the analog voltage signal into a corresponding digital signal and feeds it back to the main controller 700 through the second feedback terminal B2. The main controller 700 determines whether the actual output voltage meets the set value based on the received digital signal and makes necessary adjustments, such as changing the duty cycle of the PWM signal to adjust the output voltage of the power management circuit 100.

[0088] Through the precise voltage division, filtering, and analog-to-digital conversion functions of the monitoring circuit 400, the main controller 700 can obtain the accurate value of the output voltage in real time, thereby realizing the closed-loop control of the power management circuit 100 and ensuring that the voltage output of the skin care device always meets the preset care requirements.

[0089] Continuing to refer to FIG. 2, in this embodiment, the first voltage divider 401 includes a first resistor R1 and a second resistor R2. One end of the first resistor R1 is electrically connected to the first detection terminal B4, the other end of the first resistor R1 is electrically connected to one end of the second resistor R2, the other end of the second resistor R2 is grounded, and the input end of the first filter device 500 is electrically connected between the first resistor R1 and the second resistor R2.

[0090] In this embodiment, the first voltage divider 401 consists of two resistors: the first resistor R1 and the second resistor R2. The specific connection method is that one end of the first resistor R1 is electrically connected to the first detection terminal B4 (i.e., the voltage signal received from the output terminal of the power management circuit 100), the other end of the first resistor R1 is connected to one end of the second resistor R2, and the other end of the second resistor R2 is grounded. The input end of the first filter device 500 is connected to the node between the first resistor R1 and the second resistor R2.

[0091] The basic principle of voltage division is to form a voltage drop through series resistors, so that the output voltage signal is a part of the input voltage. The first resistor R1 and the second resistor R2 form a resistor voltage divider for dividing the higher voltage received at the first detection terminal B4 into a lower voltage.

[0092] The first resistor R1 in this embodiment can be regarded as a pull-up resistor. Its function is to introduce the input voltage into the voltage division circuit and cooperate with the second resistor R2 (pull-down resistor) to distribute the input voltage in proportion.

[0093] Specifically: The first resistor R1 (pull-up resistor), connected between the input voltage (the first detection terminal B4) and the voltage division node, plays the role of "pulling up" the voltage and introducing the input signal to the voltage division point. The second resistor R2 (pull-down resistor) is connected between the voltage division node and the ground, playing the role of "pulling down" the voltage and stabilizing the output voltage after voltage division at a lower level suitable for subsequent processing.

[0094] This combination of pull-up and pull-down resistors effectively reduces the relatively high input voltage to a range that can be processed by the analog-to-digital conversion module 600 through the voltage division formula. The pull-up resistor and the pull-down resistor work together to form a stable voltage division output voltage.

[0095] Continuing to refer to Figure 2 , in this embodiment, the first filtering device 500 is composed of a third resistor R3 and a first capacitor C1. The specific connection method is that the first filtering device 500 includes a third resistor R3 and a first capacitor C1. One end of the third resistor R3 is electrically connected between the first resistor R1 and the second resistor R2. The other end of the third resistor R3 is electrically connected to one end of the first capacitor C1 and the input end of the analog-to-digital conversion module 600. The other end of the first capacitor C1 is grounded.

[0096] In this embodiment, the first filtering device 500 constitutes a simple RC low-pass filter. The combination of the third resistor R3 and the first capacitor C1 is used to filter out high-frequency noise and interference signals in the input signal.

[0097] Its working principle is to utilize the charging and discharging characteristics of the capacitor and the characteristic of the resistor to impede the change of current to process the passing signal. Specifically, when the voltage signal enters the filter from the voltage divider device, the high-frequency components are bypassed to the ground due to the low impedance of the capacitor, while the low-frequency signal or DC signal is transmitted to the analog-to-digital conversion module 600 through the resistor.

[0098] The third resistor R3 plays a role in limiting the current of the input signal to prevent signal distortion caused by excessive current. The first capacitor C1 smooths the high-frequency components with relatively fast voltage changes, making the signal output to the analog-to-digital conversion module 600 more stable and continuous. Through this filtering effect, the filter can filter out the high-frequency noise components in the input signal and only retain the stable DC voltage or low-frequency components, thereby improving the measurement accuracy of the analog-to-digital conversion module 600.

[0099] The low-pass filter can effectively reduce the high-frequency noise introduced by electromagnetic interference (EMI) and radio frequency interference (RFI) in the circuit. If these noises are not processed, they may seriously affect the measurement accuracy and system stability. Through filtering, the voltage signal input to the analog-to-digital conversion module 600 becomes smoother and more stable, which helps to avoid measurement errors of the ADC caused by noise and voltage spikes and ensures the accuracy of the signal.

[0100] Refer to Figure 3 , Figure 3 is a schematic diagram of the module electrical connection of the voltage regulation circuit of the skin care device in another embodiment of the present invention.

[0101] In this embodiment, the power management circuit 100 includes:

[0102] Boost circuit 200, the second output terminal A2 of the boost circuit 200 is electrically connected to the first output terminal A1, and the third feedback terminal B3 of the boost circuit 200 is electrically connected to the first output terminal A1. The third feedback terminal B3 is used to monitor the voltage delivered from the first output terminal A1 to the electrode 900;

[0103] Signal receiving circuit 300, one end of the signal receiving circuit 300 is electrically connected to the third feedback terminal B3, and the other end of the signal receiving circuit 300 is electrically connected to the first feedback terminal B1;

[0104] Among them, the signal receiving circuit 300 is used to receive and process the pulse width modulation signal of the main controller 700, and the boost circuit 200 adjusts the voltage delivered to the electrode 900 based on the processed pulse width modulation signal.

[0105] In this embodiment, the power management circuit 100 is composed of the boost circuit 200 and the signal receiving circuit 300. The design of this power management circuit 100 aims to accurately adjust the voltage delivered to the electrode 900 by receiving and processing the pulse width modulation (PWM) signal from the main controller 700, so as to meet the requirements of different care modes of the skin care device.

[0106] The main function of the boost circuit 200 is to boost a lower input voltage to a required higher voltage to adapt to different skin care needs. The circuit provides a stable and adjustable current output by adjusting the output voltage.

[0107] The second output terminal A2 of the boost circuit 200 is electrically connected to the first output terminal A1, and is used to deliver the boosted voltage to the electrode 900 to ensure that the electrode 900 receives the correct voltage level to achieve the care effect. The third feedback terminal B3 is electrically connected to the first output terminal A1 and is used to monitor the actual voltage of the first output terminal A1. The function of the third feedback terminal B3 is to detect the voltage delivered to the electrode 900 in real time and feedback this information to the boost circuit 200 for automatic voltage regulation.

[0108] That is to say, the boost circuit 200 can automatically judge whether the output meets the set value according to the voltage signal of the third feedback terminal B3, and stabilize the output voltage by adjusting the internal switch duty cycle. This can ensure that the power management circuit 100 outputs a stable voltage that meets the set value and is applicable to different care modes.

[0109] The signal receiving circuit 300 is used to receive the PWM signal from the main controller 700 and process this signal to meet the adjustment requirements of the boost circuit 200. The processed PWM signal determines the switching behavior of the boost circuit 200, thereby adjusting the output voltage.

[0110] One end of the signal receiving circuit 300 is connected to the third feedback terminal B3, and the other end is connected to the first feedback terminal B1. Through this connection, the signal receiving circuit 300 not only receives the PWM signal but also works in coordination with the feedback mechanism to ensure precise regulation of the voltage output.

[0111] The signal receiving circuit 300 performs processing such as filtering on the received PWM signal to make it match the control logic of the boost circuit 200. This processing includes adjusting the duty cycle and frequency of the PWM signal to achieve precise control of the output voltage.

[0112] During the actual working process, the main controller 700 outputs a corresponding PWM signal to the signal receiving circuit 300 according to the voltage of the electrode 900 monitored in real time. After the signal receiving circuit 300 processes the PWM signal, it outputs to the boost circuit 200. The boost circuit 200 adjusts its output voltage based on the processed PWM signal to ensure that the voltage received by the electrode 900 precisely matches the set nursing requirements.

[0113] For example, when the main controller 700 monitors that the voltage of the electrode 900 is lower than the set value, the signal receiving circuit 300 converts the PWM signal of the main controller 700 into an appropriate control signal to instruct the boost circuit 200 to increase the output voltage. On the contrary, if the voltage is too high, the signal receiving circuit 300 adjusts the PWM signal to reduce the output voltage. This closed-loop control mechanism ensures the accuracy and response speed of voltage regulation.

[0114] The power management circuit 100 in this embodiment realizes precise control of the output voltage through the coordinated work of the boost circuit 200 and the signal receiving circuit 300. Compared with traditional voltage regulation methods, this circuit can respond more quickly and accurately to changes in nursing needs, ensure that the voltage received by the electrode 900 is always in the best state, thereby improving the overall performance and user experience of the skin care device. At the same time, by flexibly adjusting the duty cycle and frequency of the PWM signal, this circuit can support multiple nursing modes and provide personalized solutions for different skin types and nursing needs.

[0115] Refer to Figure 4 , Figure 4 which is the circuit diagram of the voltage regulation circuit of the skin care device in another embodiment of the present utility model.

[0116] In this embodiment, the signal receiving circuit 300 includes:

[0117] A second filtering device 301, the input end of the second filtering device 301 is electrically connected to the first feedback terminal B1, and one end of the second filtering device 301 is grounded;

[0118] The impedance matching element R6, one end of the impedance matching element R6 is electrically connected to the other end of the second filtering device 301, and the other end of the impedance matching element R6 is connected to the other end of the signal receiving circuit 300;

[0119] Wherein, when the main controller 700 outputs a pulse width modulation signal, the second filtering device 301 filters the pulse width modulation signal, and the impedance matching element R6 adjusts the pulse width modulation signal to match the voltage monitored at the third feedback terminal B3.

[0120] In this embodiment, the signal receiving circuit 300 is composed of a second filtering device 301 and an impedance matching element R6 (actually a resistor). The design purpose of this circuit is to filter and match the impedance of the pulse width modulation (PWM) signal output by the main controller 700, so as to ensure that the signal can match the voltage detected at the third feedback terminal B3 (i.e., the FB pin of the boost chip) of the boost circuit 200, thereby precisely adjusting the output voltage of the boost circuit 200.

[0121] During the working process, the PWM signal output by the main controller 700 first passes through the second filtering device 301, and this filter converts the high-frequency PWM signal into a relatively smooth DC voltage signal. Then, the filtered signal passes through the impedance matching element R6 (resistor) to adjust the impedance and amplitude of the signal, so that it can effectively match the voltage monitored at the third feedback terminal B3 (FB pin) of the boost circuit 200 (to meet the input impedance of the third feedback terminal B3).

[0122] The core of this matching process lies in the superposition and adjustment of the filtered and smoothed PWM signal with the feedback voltage of the FB pin. When the main controller 700 detects that the output voltage deviates from the set value, it will adjust the duty cycle of the PWM signal. Through filtering and impedance matching, the feedback voltage of the FB pin is changed, thereby instructing the boost circuit 200 to adjust the output voltage to reach the desired voltage level. This adjustment method ensures that the boost circuit 200 can quickly and accurately respond to the voltage adjustment requirements and maintain the stability of the output voltage.

[0123] When it is necessary to actively adjust the output voltage from 4V to 5V in a boost manner, the main controller 700 will output a corresponding PWM signal according to the set target voltage. The main controller 700 increases the duty cycle of the PWM signal, for example, from 50% to 70%, so that after the output signal is processed by the second filtering device 301, a higher smooth DC voltage signal is obtained. This signal is then adjusted by the impedance matching element R6 so that it is superimposed and matched with the feedback voltage of the FB pin, thereby instructing the boost circuit 200 to increase the output voltage to 5V.

[0124] During this process, the monitoring circuit 400 continues to monitor the voltage value output to the electrode 900 in real time and feedback it to the main controller 700. If it is detected that the output voltage does not reach the set value of 5V, the main controller 700 will further adjust the duty cycle of the PWM signal to continuously optimize the output voltage until the desired 5V is reached. This active adjustment mechanism ensures the accuracy and efficiency of voltage adjustment, can quickly achieve different voltage settings according to care needs, and improves the flexibility and user experience of the device.

[0125] Continue to refer to Figure 4 , in this embodiment, the boost circuit 200 includes:

[0126] A boost conversion circuit 201, the output end of the boost conversion circuit 201 is electrically connected to the second output end A2;

[0127] A boost control chip U1, the feedback end of the boost control chip U1 is electrically connected to the third feedback end B3, and the input end of the boost control chip U1 is electrically connected to the boost conversion circuit 201.

[0128] Among them, the boost control chip U1 is used to adjust the voltage of the output of the boost conversion circuit 201 to the first output end A1 according to the level signal of the third feedback end B3.

[0129] In this embodiment, the boost circuit 200 includes a boost conversion circuit 201 and a boost control chip U1, which are designed to accurately adjust the output voltage according to the feedback signal. Among them, the main function of the boost conversion circuit 201 is to boost the input voltage to the required higher voltage and output it to the load device through the second output end A2. This circuit is usually composed of components such as an inductor L1, a capacitor, and a diode D1, and realizes voltage increase through energy storage and release.

[0130] The boost control chip U1 is used to monitor and adjust the working state of the boost conversion circuit 201 to achieve accurate voltage output. The chip adjusts the duty cycle of the internal switch through a feedback mechanism, thereby controlling the output voltage.

[0131] As for the selection of the boost control chip U1, boost control chips U1 such as SY7304DBC, LM2577, and TPS61070 can be used. These chips have the characteristics of high efficiency and fast response and are suitable for different boost requirements.

[0132] During the working process, the main controller 700 mainly adjusts the level of the feedback end (FB pin) of the boost control chip U1 by outputting a PWM signal.

[0133] Specifically, the PWM signal output by the main controller 700 passes through a low-pass filter (such as an RC filter) to convert the high-frequency pulse signal into a smooth DC voltage. A part of the current of the filter flows to the ground through the ground path, and the loss of this part of the filtered signal produces an "attracting" effect on the voltage of the FB pin, causing the detected voltage of the FB pin to decrease.

[0134] Not only a part of the filtered PWM signal enters the ground, but another part enters the FB pin through the impedance matching element R6 (usually a resistor). The function of the impedance matching element R6 is to limit and regulate the current entering the FB pin to ensure that the signal matches the impedance of the FB pin, thereby maintaining the stability of the feedback voltage.

[0135] Since the impedance matching element R6 limits the current entering the FB pin, even if the duty cycle of the PWM signal increases, the current entering the FB pin is controlled within the designed range and will not cause the voltage of the FB pin to be too high.

[0136] When the duty cycle of the PWM signal increases, the filtered voltage rises, and the current flowing to the ground (which is also grounded, equivalent to the negative pole) increases, making the voltage "attracting" force on the voltage at the FB pin (that is, the voltage at the third feedback terminal B3) greater. As a result, the voltage of the FB pin is further pulled down relative to the reference point.

[0137] The transconductance amplifier (GM) of the boost control chip U1 compares the voltage of the FB pin with the internal reference voltage. When the voltage of the FB pin is lower than the reference voltage, the chip will increase the duty cycle of the switch, thereby increasing the output voltage.

[0138] Continue to refer to Figure 4 In this embodiment, the boost conversion circuit 201 includes an inductor L1 and a diode D1. The input end of the inductor L1 is connected to the power supply, the output end of the inductor L1 is electrically connected to the anode of the diode D1, and the cathode of the diode D1 is electrically connected to the output end of the boost conversion circuit 201; the input end of the boost control chip U1 is electrically connected between the inductor L1 and the diode D1;

[0139] Among them, the input end of the boost control chip U1 is used to regulate the voltage output by the boost conversion circuit 201 to the first output end A1.

[0140] In this embodiment, the boost conversion circuit 201 is composed of an inductor L1 and a diode D1. Through the precise control of the boost control chip U1, this design realizes the increase of the input voltage and outputs a stable high voltage.

[0141] Specifically, the input end of the inductor L1 is connected to the power supply, and its main function is to store electrical energy. When the switch of the boost control chip U1 is turned on, the inductor L1 stores electrical energy and generates current.

[0142] The anode of diode D1 is connected to the output terminal of inductor L1, and the cathode is connected to the output terminal of the boost conversion circuit 201. The function of diode D1 is to guide the energy released by inductor L1 into the output terminal, prevent the current from flowing backward, and ensure the unidirectional flow of current.

[0143] The input terminal of the boost control chip U1 is electrically connected to the position between inductor L1 and diode D1. This connection point is the key point where inductor L1 releases electrical energy and delivers it to the first output terminal A1 through diode D1. The boost control chip U1 monitors the change of the output voltage through its feedback terminal (FB pin, which is also the third feedback terminal B3 of the boost circuit 200), and adjusts the on and off time of the switch in real time, so as to accurately control the output voltage.

[0144] During the boost process, the boost control chip U1 periodically connects and disconnects the path between inductor L1 and ground by controlling the internal switching element. When the switch is on, inductor L1 forms a loop with ground, and the current passes through inductor L1, and inductor L1 stores magnetic energy. At this time, diode D1 is cut off due to reverse bias to prevent current from entering the output terminal.

[0145] When the switch is off, the energy stored in inductor L1 generates a reverse electromotive force due to the sudden interruption of the current, and the output voltage of inductor L1 rises significantly, higher than the input voltage. At this time, diode D1 conducts, and the energy released by inductor L1 is transmitted to the first output terminal A1.

[0146] The boost control chip U1 detects the output voltage through the FB pin and compares it with the internal reference voltage. If the output voltage is lower than the set value, the chip will increase the on time of the switch (that is, increase the duty cycle of the switch), so that inductor L1 stores more energy and releases more energy, thereby increasing the output voltage.

[0147] When actively adjusting the voltage, the level of the FB pin of the boost control chip U1 can be controlled by changing the duty cycle of the PWM signal to accurately control the output voltage (the larger the duty cycle, the more energy stored and released by inductor L1, and the higher the output voltage; the smaller the duty cycle, the lower the output voltage).

[0148] Through this boost conversion principle based on the energy storage and release of inductor L1 and the accurate PWM control of the boost control chip U1, this embodiment realizes the stable regulation of the output voltage. Whether it is to cope with the change of the input voltage or the fluctuation of the load, the boost control chip U1 can quickly adjust to keep the output voltage stable.

[0149] Continue to refer to Figure 4 , in this embodiment, the voltage regulation circuit of the skin care device further includes a second voltage divider 800, and the second voltage divider 800 is electrically connected between the third feedback terminal B3 and the first output terminal A1 and grounded;

[0150] Among them, the second voltage divider 800 is used to obtain the voltage of the voltage-divided first output terminal A1 and feedback it to the third feedback terminal B3.

[0151] In this embodiment, the main function of the second voltage divider 800 is to divide the voltage of the first output terminal A1, reduce the output voltage proportionally to a lower voltage signal, and feedback this voltage-divided signal to the third feedback terminal B3. This feedback voltage is used for internal comparison and regulation of the boost control chip U1 to ensure that the output voltage is maintained within the set range.

[0152] The second voltage divider 800 distributes the output voltage in a certain proportion to a lower voltage, and this voltage signal reflects the change of the actual output voltage. The voltage-divided voltage is input to the feedback terminal of the boost control chip U1 (i.e., the third feedback terminal B3), and the boost control chip U1 internally judges whether the output voltage reaches the set value according to this feedback signal.

[0153] Specifically, the transconductance amplifier (GM) inside the boost control chip U1 compares the voltage-divided signal received at the third feedback terminal B3 with the reference voltage inside the chip. If the voltage-divided signal is lower than the reference voltage, it means that the actual output voltage is lower than the set value, and the chip will increase the duty cycle of the switch to boost the output voltage.

[0154] Through this voltage-dividing feedback mechanism, the boost control chip U1 can monitor and regulate the output voltage in real time. Regardless of how the input voltage changes or how the load conditions change, the chip can achieve precise control of the output voltage by adjusting the duty cycle.

[0155] Combined with the previously mentioned PWM control mechanism, the PWM signal output by the main controller 700, after filtering and smoothing, part of the signal goes to ground, and the other part enters the FB pin through the impedance matching element R6 and combines with the voltage-divided signal. The change in the duty cycle of the PWM signal will affect the voltage fed back to the third feedback terminal B3 by the second voltage divider 800 (i.e., pulling down the voltage of the third feedback terminal B3), thereby actively adjusting the increase in the output voltage of the boost control chip U1.

[0156] By introducing the second voltage divider 800, this embodiment realizes precise monitoring and feedback of the voltage of the first output terminal A1. The second voltage divider 800 reduces the output voltage to a suitable voltage range and feeds it back to the third feedback terminal B3 of the boost control chip U1, enabling the chip to adjust the output voltage based on the voltage-divided signal.

[0157] The second voltage divider device 800 includes a fourth resistor R4 and a fifth resistor R5. One end of the fourth resistor R4 is electrically connected to the first detection terminal B4, the other end of the fourth resistor R4 is electrically connected to one end of the fifth resistor R5, the other end of the fifth resistor R5 is grounded, and the third feedback terminal B3 is electrically connected between the fourth resistor R4 and the fifth resistor R5.

[0158] Continue to refer to Figure 4 , in this embodiment, the second voltage divider device 800 further includes a second capacitor C2. One end of the second capacitor C2 is electrically connected to one end of the fourth resistor R4, and the other end of the second capacitor C2 is electrically connected to the other end of the second capacitor C2. The reason for connecting a second capacitor C2 in parallel with the first resistor R1 is to smooth the feedback signal, filter out high-frequency noise and spike interference, thereby stabilizing the feedback voltage. This design can significantly improve the feedback accuracy of the boost control chip U1 and the stability of the output voltage, and helps to achieve smoother and more accurate voltage regulation.

[0159] Generally speaking, the boost circuit 200 outputs a default voltage to the electrode 900 at the initial stage, and at the same time, it detects the voltage of the first output terminal A1 in real time through its third feedback terminal B3 (FB pin) to determine whether the current voltage meets the expected target voltage range. If it is detected that the output voltage deviates from the expectation, the boost circuit 200 will automatically adjust the duty cycle of the internal switch and regulate the output voltage back to the expected range through a self-tuning mechanism to ensure that the voltage output by the electrode is stable and meets the initial setting.

[0160] When the voltage needs to be increased, the main controller 700 starts to output a PWM signal to the signal receiving circuit 300. The signal receiving circuit 300 processes the PWM signal and divides it into two parts:

[0161] One part of the PWM signal enters the third feedback terminal B3 (FB pin), and this part of the signal directly affects the voltage of the FB pin, causing the feedback voltage of the FB pin to be partially covered by the PWM signal.

[0162] The other part of the PWM signal enters the ground through the capacitor of the second filtering device 301, and the filtered PWM signal flows to the ground through the capacitor, generating an "attracting" effect on the feedback voltage, thereby pulling down the voltage of the FB pin.

[0163] At this time, due to the regulation of the PWM signal, the feedback voltage sensed by the FB pin is pulled down. When the comparator inside the boost circuit 200 detects that the feedback voltage is lower than the expected ratio, it is considered that the output voltage is insufficient. To compensate for this deficiency, the boost circuit 200 will increase the duty cycle and switching frequency of the internal switch to increase the output voltage. That is, the boost control chip U1 of the boost circuit 200 increases the duty cycle to make the inductor L1 store more energy and release a higher voltage, thereby realizing the boost function.

[0164] The main controller 700 detects the output voltage of the boost circuit 200 in real time through the monitoring circuit. When the monitoring circuit 400 detects that the current output voltage has reached the set boost target, the main controller 700 will stop outputting the PWM signal to the signal receiving circuit 300.

[0165] With the stop of the PWM signal, the feedback voltage of the FB pin returns to normal, and the self-tuning function of the boost circuit 200 maintains the output voltage within the expected target range.

[0166] Throughout the process, the boost circuit 200 maintains real-time detection and feedback adjustment of the output voltage. Even after the PWM signal stops, the boost circuit 200 still relies on the monitoring ability of its third feedback terminal B3 to adaptively adjust the output voltage to ensure that the electrode continuously obtains a stable voltage output.

[0167] When the voltage needs to be adjusted again, the main controller 700 can re-output the PWM signal to the boost circuit 200 according to actual needs for a new boost adjustment.

[0168] Through the above working process, the boost circuit 200 can output a stable default voltage in the initial stage and achieve the active boost adjustment function through the PWM signal adjustment of the main controller 700. The signal receiving circuit 300 successfully pulls down the feedback terminal voltage by distributing and filtering the PWM signal, triggering the boost circuit 200 to increase the output voltage. At the same time, the coordinated work of the main controller 700 and the monitoring circuit enables the device to stop boosting in time after the voltage reaches the target, ensuring precise control and stable output of the voltage of the electrode 900.

[0169] The present utility model further proposes a skin care device, including an electrode 900 and a voltage regulation circuit of the skin care device as described in the foregoing embodiments. Since this skin care device adopts all the technical solutions of the above-mentioned all embodiments, it has at least all the technical effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated herein one by one. Among them, the voltage regulation circuit of the skin care device is electrically connected to the electrode 900, and the voltage regulation circuit of the skin care device is used to regulate the voltage output by the electrode 900.

[0170] The electrode 900 in this embodiment is mainly used to contact the skin and realizes the skin care function by outputting a microcurrent. The voltage regulation circuit of the skin care device is electrically connected to the electrode 900 and is used to regulate the voltage output by the electrode 900. The current regulation circuit realizes various care effects by adjusting the output voltage according to different care needs.

[0171] By adjusting the output voltage of the current adjustment circuit, the device can achieve different care modes. For example, a low voltage output can be used for gentle skin soothing and moisturizing care, while a high voltage output can be used for deep cleansing and promoting the absorption of active ingredients in skin care products by the skin.

[0172] According to the user's skin type and care needs, the current adjustment circuit can adjust the output voltage of the electrode 900 to achieve a personalized care plan. For example, sensitive skin can choose a lower voltage mode, while skin that requires enhanced care can choose a higher voltage mode.

[0173] In addition, the device can automatically adjust the output voltage according to the real-time detected skin condition to optimize the care effect. This dynamic adjustment ensures that the device can continuously provide the best care experience and meet the needs of different users and different skin conditions.

[0174] And different voltage outputs can stimulate different layers of the skin, improve blood circulation, promote collagen regeneration, or strengthen skin barrier repair. In this way, the skin care device can significantly enhance the care effect and bring more significant and lasting skin improvement to users.

[0175] By adopting the above-mentioned current adjustment circuit, this skin care device can flexibly adjust the output voltage of the electrode 900 to meet diverse skin care needs. Whether it is daily moisturizing care, deep cleansing, or targeted care, it can be achieved by adjusting the current voltage, providing users with a personalized and precise skin care solution.

[0176] The above are only partial or preferred embodiments of the present utility model. Neither the text nor the drawings can limit the scope of protection of the present utility model. All equivalent structural transformations made by using the content of the specification and drawings of the present utility model under the overall concept of the present utility model, or direct / indirect applications in other related technical fields are included in the scope of protection of the present utility model.

Claims

1. A voltage regulating circuit for a skin care device, characterized in that: include: A power management circuit, wherein a first output terminal of the power management circuit is used to connect to an electrode; A monitoring circuit, wherein a first detection terminal of the monitoring circuit is used to be electrically connected between the first output terminal of the power management circuit and the electrode, so as to monitor the voltage transmitted from the first output terminal of the power management circuit to the electrode; A main controller, wherein the main controller is electrically connected to the first feedback terminal of the power management circuit and the second feedback terminal of the monitoring circuit respectively, so as to transmit a pulse width modulation signal to the first feedback terminal of the power management circuit according to a signal fed back from the second feedback terminal of the monitoring circuit, so that the power pipeline circuit adjusts the voltage transmitted to the electrode according to the pulse width modulation signal.

2. The voltage regulating circuit of the skin care device according to claim 1, characterized in that: The monitoring circuit comprises: A first voltage divider device, one end of which is electrically connected to the first detection end, and the other end of which is grounded; a first filter device, wherein an input terminal of the first filter device is electrically connected to the first voltage divider device; an analog-to-digital conversion module, one end of which is electrically connected to the output end of the first filter device, and the other end of which is electrically connected to the second feedback end; Among them, the first voltage divider device is used to divide the voltage of the first output end, the first filter device is used to filter the electrical signal transmitted to the analog-to-digital conversion module after being divided by the first voltage divider device, and the analog-to-digital conversion module is used to convert the electrical signal output after filtering by the first filter device into a digital signal and feed it back to the main controller.

3. The voltage regulating circuit of the skin care device according to claim 2, characterized in that: The first voltage divider device includes a first resistor and a second resistor, one end of the first resistor is electrically connected to the first detection end, the other end of the first resistor is electrically connected to one end of the second resistor, the other end of the second resistor is grounded, and the input end of the first filter device is electrically connected between the first resistor and the second resistor.

4. The voltage regulating circuit of the skin care device according to claim 3, characterized in that: The first filter device includes a third resistor and a first capacitor, one end of the third resistor is electrically connected between the first resistor and the second resistor, the other end of the third resistor is electrically connected to one end of the first capacitor and the input end of the analog-to-digital conversion module, and the other end of the first capacitor is grounded.

5. The voltage regulating circuit of the skin care device according to claim 1, characterized in that: The power management circuit comprises: a boost circuit, wherein a second output terminal of the boost circuit is electrically connected to the first output terminal, a third feedback terminal of the boost circuit is electrically connected to the first output terminal, and the third feedback terminal is used to monitor the voltage transmitted from the first output terminal to the electrode; a signal receiving circuit, one end of which is electrically connected to the third feedback end, and the other end of which is electrically connected to the first feedback end; The signal receiving circuit is used to receive and process the pulse width modulation signal of the main controller, and the boost circuit adjusts the voltage delivered to the electrode based on the processed pulse width modulation signal.

6. The voltage regulating circuit of the skin care device according to claim 5, characterized in that: The signal receiving circuit comprises: a second filter device, wherein an input end of the second filter device is electrically connected to the first feedback end, and one end of the second filter device is grounded; an impedance matching element, one end of the impedance matching element being electrically connected to the other end of the second filter device, and the other end of the impedance matching element being electrically connected to the other end of the signal receiving circuit; When the main controller outputs a pulse width modulated signal, the second filter device filters the pulse width modulated signal, and the impedance matching element adjusts the pulse width modulated signal to match the voltage monitored by the third feedback terminal.

7. The voltage regulating circuit of the skin care device according to claim 5, characterized in that: The boost circuit comprises: a boost conversion circuit, wherein the output end of the boost conversion circuit is electrically connected to the second output end, A boost control chip, wherein a feedback terminal of the boost control chip is electrically connected to the third feedback terminal, and an input terminal of the boost control chip is electrically connected to the boost conversion circuit; The boost control chip is used to adjust the voltage output from the boost conversion circuit to the first output terminal according to the level signal of the third feedback terminal.

8. The voltage regulating circuit of the skin care device according to claim 7, characterized in that: The boost conversion circuit comprises an inductor and a diode, wherein the input end of the inductor is connected to a power supply, the output end of the inductor is electrically connected to the anode of the diode, and the cathode of the diode is electrically connected to the output end of the boost conversion circuit; the input end of the boost control chip is electrically connected between the inductor and the diode; Wherein, the input end of the boost control chip is used to adjust the voltage outputted from the boost conversion circuit to the first output end.

9. The voltage regulating circuit of the skin care device according to claim 6, characterized in that: The voltage regulating circuit of the skin care device further comprises a second voltage dividing device, the second voltage dividing device is electrically connected between the third feedback terminal and the first output terminal and is grounded; The second voltage divider is used to obtain the voltage of the divided first output terminal and feed it back to the third feedback terminal.

10. The voltage regulating circuit of the skin care device according to claim 9, characterized in that: The second voltage divider device includes a fourth resistor and a fifth resistor, one end of the fourth resistor is electrically connected to the first detection end, the other end of the fourth resistor is electrically connected to one end of the fifth resistor, the other end of the fifth resistor is grounded, and the third feedback end is electrically connected between the fourth resistor and the fifth resistor.

11. The voltage regulating circuit of the skin care device according to claim 10, characterized in that: The second voltage divider device further includes a second capacitor, one end of the second capacitor is electrically connected to one end of the fourth resistor, and the other end of the second capacitor is electrically connected to the other end of the fourth resistor.

12. The voltage regulating circuit of the skin care device according to claim 1, characterized in that: The main controller is a main control chip, and the main control chip is configured to control the power management circuit to switch the voltage delivered to the electrode between multiple gears within one cycle.

13. A skin care device, characterized in that: It comprises an electrode and a voltage regulating circuit of a skin care device as claimed in any one of claims 1 to 11, wherein the voltage regulating circuit of the skin care device is electrically connected to the electrode, and the voltage regulating circuit of the skin care device is used to regulate the voltage output by the electrode.

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