Power conversion device and radio frequency beauty instrument

Abstract

The present invention provides a power conversion device and a radio frequency beauty instrument, wherein the power conversion circuit includes: a full-bridge circuit, and an input interface and an output interface connected to the full-bridge circuit; the full-bridge circuit is used to obtain the PWM waveform output by the control module in the radio frequency beauty instrument through the input interface, and convert the PWM waveform into a target frequency waveform, and output the target frequency waveform through the output interface, thereby realizing the conversion of the output power of the radio frequency beauty instrument in a non-isolated manner through the power conversion device, realizing multiple functions of the radio frequency beauty instrument, meeting the user's various application needs, and improving the user experience.

Description

Technical Field

[0001] The present invention relates to the technical field of beauty instruments, and in particular to power conversion equipment and radio frequency beauty instruments. Background Art

[0002] With improved living standards, people are increasingly focused on health and beauty, and beauty has become a rigid demand. Beauty devices are machines that adjust to human physiological functions to improve the body and face. They offer a variety of functions, including whitening, skin rejuvenation, freckle removal, wrinkle removal, hair removal, and facial wrinkle removal. Facial wrinkle removal devices utilize ultrasonic radio frequency technology to massage the facial skin. The ultrasound waves can also remove wrinkles, resulting in a radiant complexion and achieving a beautiful effect.

[0003] Most existing beauty devices use a microcontroller (MCU) to output a single square wave with a fixed frequency. This single square wave then passes through a driver chip to generate two complementary square waves. These two square waves then pass through a power conversion circuit, such as a transformer, to generate an RF (Radio Frequency) waveform. This RF waveform then acts on the skin through a beauty head to achieve beauty effects. In practice, the square wave's duty cycle is fixed at 50% and cannot be adjusted. This results in an unadjustable peak voltage of the subsequent RF waveform, causing a stinging and burning sensation during use. Furthermore, the transformer's relatively large concentrated capacitance prevents high-frequency power conversion, limiting the device's output frequency and, consequently, its functionality, impacting the user experience. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a power conversion device and a radio frequency beauty instrument to alleviate the above-mentioned technical problems. The output frequency of the radio frequency beauty instrument is adjusted in a non-isolated manner through the full-bridge circuit in the power conversion device, thereby realizing multiple functions of the radio frequency beauty instrument, thereby meeting the user's various application needs and improving the user experience.

[0005] In a first aspect, an embodiment of the present invention provides a power conversion device, which is applied to a radio frequency beauty instrument; wherein the power conversion device includes a full-bridge circuit, and an input interface and an output interface connected to the full-bridge circuit; the full-bridge circuit is used to obtain a PWM waveform output by a control module in the radio frequency beauty instrument through the input interface, and convert the PWM waveform into a target frequency waveform, and output the target frequency waveform through the output interface.

[0006] In combination with the first aspect, an embodiment of the present invention provides a first possible implementation method of the first aspect, wherein the above-mentioned full-bridge circuit includes a complementary first bridge arm and a second bridge arm; the above-mentioned input interface includes a first input end and a second input end, and the above-mentioned output interface includes a first output end and a second output end; wherein the first bridge arm is respectively connected to the first input end and the first output end, and the second bridge arm is respectively connected to the second input end and the second output end, and the first input end and the second input end are complementary, and the first output end and the second output end are complementary.

[0007] In combination with the first possible implementation of the first aspect, an embodiment of the present invention provides a second possible implementation of the first aspect, wherein the above-mentioned first bridge arm includes a first transistor and a second transistor, and the above-mentioned second bridge arm includes a third transistor and a fourth transistor; the first transistor and the third transistor are both PNP transistors, and the second transistor and the fourth transistor are both NPN transistors.

[0008] In a second aspect, an embodiment of the present invention provides a radio frequency beauty instrument, comprising: a beauty instrument body and a beauty head fixed at the end of the beauty instrument body; wherein the beauty instrument body is configured with the power conversion device of the first aspect mentioned above, as well as a control module and a drive circuit, the control module, the drive circuit and the power conversion device are connected in sequence, and the power conversion device is also connected to the beauty head; the beauty head is provided with an acquisition module connected to the control module, for acquiring skin parameters and sending the skin parameters to the control module; wherein the skin parameters include skin moisture parameters and / or skin temperature parameters; the control module pre-stores a mapping relationship between skin parameters and frequency waveforms; the control module is configured to receive skin parameters, read a target frequency waveform corresponding to the received skin parameters from the mapping relationship; and output two complementary PWM waveforms with adjustable duty cycle corresponding to the target frequency waveform, and transmit the PWM waveform to the power conversion device through the drive circuit, so that the power conversion device converts the PWM waveform into a target frequency waveform, and applies the target frequency waveform to the skin through the beauty head.

[0009] In combination with the second aspect, an embodiment of the present invention provides a first possible implementation method of the second aspect, wherein the above-mentioned radio frequency beauty instrument also includes a power supply module connected to the control module, the drive circuit and the power conversion device; the power supply module is used to supply power to the control module, the drive circuit and the power conversion device.

[0010] In combination with the second aspect, an embodiment of the present invention provides a second possible implementation method of the second aspect, wherein a button module connected to the control module is further provided on the beauty instrument body, and the button module includes a switch button unit and a gear button unit; wherein the gear button unit includes a high-gear button, a middle-gear button and a low-gear button.

[0011] In combination with the second possible implementation of the second aspect, an embodiment of the present invention provides a third possible implementation of the second aspect, wherein a gear indicator light and a breathing marquee are also provided on the beauty instrument body; the gear indicator light is set within a preset distance range of the gear button unit, and is used to indicate the gear information when the radio frequency beauty instrument is working; the breathing marquee is used to indicate the working status of the radio frequency beauty instrument.

[0012] In combination with the second aspect, an embodiment of the present invention provides a fourth possible implementation of the second aspect, wherein a plurality of electrode sheets are provided on the beauty head, and the plurality of electrode sheets are evenly distributed according to the shape of the beauty head; wherein the shape of the beauty head is one of the following: circular, oval, heart-shaped and square.

[0013] In combination with the second aspect, an embodiment of the present invention provides a fifth possible implementation of the second aspect, wherein a charging interface is provided at the bottom of the beauty instrument body for connecting to the mains electricity to charge the radio frequency beauty instrument.

[0014] In combination with the second aspect, an embodiment of the present invention provides a sixth possible implementation of the second aspect, wherein the above-mentioned radio frequency beauty instrument further includes a base, and the base is provided with a groove that matches the shape of the bottom of the beauty instrument body.

[0015] The embodiments of the present invention bring the following beneficial effects:

[0016] An embodiment of the present invention provides a power conversion device and a radio frequency beauty instrument, wherein the power conversion device includes a full-bridge circuit, and realizes power conversion of the radio frequency beauty instrument through the full-bridge circuit. Compared with the existing transformer that performs power conversion in an isolated manner, the present application uses the power conversion device to convert the power output of the radio frequency beauty instrument in a non-isolated manner, thereby achieving high-frequency conversion, realizing multiple functions of the radio frequency beauty instrument, meeting the user's various application needs, having good practical value, and improving user experience.

[0017] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A schematic diagram of a power conversion device provided by an embodiment of the present invention;

[0021] Figure 2 A structural diagram of a full-bridge circuit provided by an embodiment of the present invention;

[0022] Figure 3 A schematic diagram of a radio frequency beauty instrument provided by an embodiment of the present invention;

[0023] Figure 4 A schematic diagram of another radio frequency beauty device provided by an embodiment of the present invention;

[0024] Figure 5 A structural diagram of a radio frequency beauty instrument provided by an embodiment of the present invention;

[0025] Figure 6 A structural diagram of another radio frequency beauty instrument provided by an embodiment of the present invention;

[0026] Figure 7 A schematic diagram of a first bridge arm driving circuit provided by an embodiment of the present invention;

[0027] Figure 8 A schematic diagram of a radio frequency beauty device provided by an embodiment of the present invention;

[0028] Figure 9 A schematic diagram of a gear position button unit provided in an embodiment of the present invention;

[0029] Figure 10 A schematic diagram of another radio frequency beauty device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] In response to the problem that the output frequency of existing beauty instruments is limited and high-frequency conversion cannot be achieved, resulting in limited functions of the beauty instruments, the embodiments of the present invention provide a power conversion device and a radio frequency beauty instrument. The power conversion device is used to adjust the output frequency of the radio frequency beauty instrument in a non-isolated manner, thereby achieving high-frequency conversion and realizing multiple functions of the radio frequency beauty instrument, thereby meeting the various application needs of users and having good practical value.

[0032] To facilitate understanding of this embodiment, a power conversion device provided by an embodiment of the present invention is described in detail below.

[0033] The embodiment of the present invention provides a power conversion device, which is applied to a radio frequency beauty instrument; Figure 1 As shown, the power conversion device 30 includes a full-bridge circuit 3, and an input interface 1 and an output interface 2 connected to the full-bridge circuit; wherein the full-bridge circuit 3 is used to obtain the PWM (PulseWidth Modulation) waveform output by the control module in the radio frequency beauty instrument through the input interface 1, and convert the PWM waveform into a target frequency waveform, and output the target frequency waveform through the output interface 2.

[0034] In one possible implementation, Figure 2 As shown, the full-bridge circuit includes a complementary first bridge arm 31 and a second bridge arm 32; the input interface includes a first input terminal A and a second input terminal A', and the output interface includes a first output terminal B and a second output terminal B', wherein the first bridge arm 31 is connected to the first input terminal A and the first output terminal B, respectively, and the second bridge arm 32 is connected to the second input terminal A' and the second output terminal B', respectively; and the first input terminal A and the second input terminal A' are complementary, and the first output terminal B and the second output terminal B' are complementary.

[0035] The first bridge arm 31 includes a first transistor 311 and a second transistor 312 , and the second bridge arm 32 includes a third transistor 321 and a fourth transistor 322 ; the first transistor 311 and the third transistor 321 are both PNP transistors, and the second transistor 312 and the fourth transistor 322 are both NPN transistors.

[0036] Specifically, the base of the first triode 311 and the base of the second triode 312 are both connected to the first input terminal A, the emitter of the first triode 311 is connected to the power supply module, the collector of the first triode 311 and the collector of the second triode 312 are both connected to the first output terminal B, and the emitter of the second triode 312 is grounded; the base of the third triode 321 and the base of the fourth triode 322 are connected to the second input terminal A', the emitter of the third triode 321 is connected to the power supply module, the collector of the third triode 321 and the collector of the fourth triode 322 are both connected to the second output terminal B', and the emitter of the fourth triode 322 is grounded.

[0037] Therefore, the full-bridge circuit 3 composed of the complementary first bridge arm 31 and the second bridge arm 32 in the embodiment of the present invention does not have the disadvantage of large integrated capacitance of the transformer, and realizes power conversion in the radio frequency beauty instrument in a non-isolated manner, thereby realizing the conversion of target frequency waveforms of 3M and above, and then realizing the output of high-frequency waveforms by the radio frequency beauty instrument, enriching the functions of the radio frequency beauty instrument, and meeting the application needs of users.

[0038] Based on the above power conversion device, an embodiment of the present invention further provides a radio frequency beauty instrument, comprising: a beauty instrument body and a beauty head fixed to the end of the beauty instrument body; wherein, Figure 3 As shown, the beauty device body includes a control module 10, a drive circuit 20, and a power conversion device 30, which are connected in sequence. The power conversion device 30 is also connected to the beauty head. It should be noted that the beauty head and the beauty device body are integrated. In actual use, the beauty head cannot be removed from the beauty device body.

[0039] The beauty head is also provided with an acquisition module 40 connected to the control module 10, for acquiring skin parameters and sending the skin parameters to the control module 10; wherein, the skin parameters include skin humidity parameters and / or skin temperature parameters; that is, when the beauty head contacts the user's skin, the acquisition module 40 starts to acquire the user's skin parameters, the skin humidity parameter is used to characterize the dryness of the user's skin, and the skin temperature parameter is used to characterize the user's current skin temperature, so that during the use of the radio frequency beauty instrument, the skin parameters can be used to ensure the user's usage experience, avoid the user's skin from being too hot or too dry, thereby improving the user experience.

[0040] The control module 10 pre-stores a mapping relationship between skin parameters and frequency waveforms; after receiving the skin parameters, the control module 10 reads the target frequency waveform corresponding to the received skin parameters from the mapping relationship; and outputs two complementary PWM waveforms with adjustable duty cycle corresponding to the target frequency waveform, and transmits the PWM waveform to the power conversion device 30 through the drive circuit 20; the power conversion device 30 is used to receive the PWM waveform, and convert the PWM waveform into a target frequency waveform through a full-bridge circuit, and apply the target frequency waveform to the skin through the beauty head, so that a variety of target frequency waveforms can be obtained according to the skin parameters and the mapping relationship, thereby realizing the multiple functions of the radio frequency beauty instrument.

[0041] The radio frequency beauty instrument provided by the embodiment of the present invention determines the target frequency waveform corresponding to the skin parameters according to the user's skin parameters, and outputs two complementary PWM waveforms with adjustable duty cycle through a control module, and converts the PWM waveform into a target frequency waveform in a non-isolated manner through a power conversion device, thereby realizing the adjustment of the output frequency of the radio frequency beauty instrument and high-frequency conversion, thereby realizing multiple functions of the radio frequency beauty instrument, meeting the user's various application needs, having good practical value, and improving user experience.

[0042] In practical applications, such as Figure 4 As shown, the control module 10 outputs two complementary PWM waveforms with adjustable duty cycles, namely PWM1 and PWM2, and transmits PWM1 and PWM2 to the power conversion device 30 after amplification by the drive circuit 20. Since the duty cycles of PWM1 and PWM2 are adjustable, the peak voltage of the target frequency waveform can be adjusted by adjusting the duty cycle, alleviating the problem of tingling and burning sensation caused by the non-adjustable peak voltage of the RF waveform during use of the beauty instrument, thereby improving the user experience. In addition, through the full-bridge circuit in the power conversion device 30, a high-frequency target frequency waveform can be achieved, thereby meeting the user's various application needs. It should be noted that the control module 10 can be configured through software so that the control module 10 outputs two complementary PWM waveforms with adjustable duty cycles. The specific software configuration method is not limited in the embodiments of the present invention.

[0043] In addition, the above-mentioned radio frequency beauty instrument can also use the self-excited oscillation + self-selective frequency network of the analog circuit to output a high-frequency target frequency waveform. However, this method is less efficient and has a relatively large volume, making it inconvenient for home radio frequency beauty instruments. For radio frequency beauty instruments in other scenarios, the generation method of the high-frequency target frequency waveform can be set according to actual conditions, and the embodiments of the present invention do not limit this.

[0044] Furthermore, the radio frequency beauty instrument further includes a power supply module 50, such as Figure 5As shown, the power supply module 50 is connected to the control module 10 , the drive circuit 20 and the power conversion device 30 respectively to supply power to the control module 10 , the drive circuit 20 and the power conversion device 30 .

[0045] The power supply module 50 can directly supply power to the control module 10. When supplying power to the drive circuit 20 and the power conversion device 30, the power supply needs to be boosted by the boost circuit, such as Figure 6 As shown, the voltage output by the power supply module 50 passes through a first-stage boost circuit 51 to obtain a first voltage, which is used to power the drive circuit 20; and the first voltage passes through a second-stage boost circuit 52 to obtain a second voltage, which is used to power the power conversion device 30. Optionally, the power supply module 50 can be a battery, and the battery can be charged through a built-in charging port and charger to store electrical energy.

[0046] Furthermore, in practical applications, in order to achieve high-frequency power, the first input terminal of the power conversion device 30 is further connected to a first bridge arm driving circuit; wherein the base of the first driving transistor in the first bridge arm driving circuit is connected to the output terminal of the driving circuit, the emitter of the first driving transistor is grounded, the collector of the first driving transistor is respectively connected to the first inductor, the second resistor and the third resistor, the second resistor is also connected to the base of the second transistor, the third resistor is respectively connected to the first diode and the first resistor, the first resistor is also connected to the base of the first transistor, the first inductor is also respectively connected to the fourth resistor and the fifth resistor, the fourth resistor, the fifth resistor and the first diode are also connected. are all connected to the emitter of the first transistor; the above-mentioned second input end is also connected to the second bridge arm driving circuit; wherein, the base of the second driving transistor in the second bridge arm driving circuit is connected to the output end of the driving circuit, the emitter of the second driving transistor is grounded, the collector of the second driving transistor is respectively connected to the second inductor, the seventh resistor and the eighth resistor, the seventh resistor is also connected to the base of the fourth transistor, the eighth resistor is respectively connected to the second diode and the sixth resistor, the sixth resistor is also connected to the base of the third transistor, the second inductor is also respectively connected to the ninth resistor and the tenth resistor, and the ninth resistor, the tenth resistor and the second diode are also connected to the emitter of the third transistor.

[0047] For ease of understanding, the first input terminal and the first bridge arm driving circuit are used as an example for explanation. Figure 7As shown, the base of the first driving transistor Q6 in the first bridge arm driving circuit is connected to the output end of the driving circuit, the emitter of the first driving transistor Q6 is grounded, the collector of the first driving transistor Q6 is respectively connected to the first inductor L1, the second resistor R2 and the third resistor R3, the second resistor R2 is also connected to the base of the second transistor Q2, the third resistor R3 is respectively connected to the first diode D1 and the first resistor R1, the first resistor R1 is also connected to the base of the first transistor Q1, the first inductor L1 is also respectively connected to the fourth resistor R4 and the fifth resistor R5, the fourth resistor R4, the fifth resistor R5 and the first diode D1 are also connected to the emitter of the first transistor Q1.

[0048] Specifically, when the first input terminal is pulled to the ground, the first transistor can be turned on and the second transistor can be turned off, thereby achieving normal operation of the first bridge arm; in practical applications, the PWM waveform amplified by the driving circuit can be further expanded after being amplified by the first driving transistor Q6. When the first driving transistor Q6 is turned on, the first inductor L1 is used to store energy, the first transistor Q1 is turned on, and the second transistor Q2 is turned off; when the first driving transistor Q6 is turned off, the first inductor L1 is used to discharge through the first diode D1, the fourth resistor R4 and the fifth resistor R5, the first transistor Q1 is turned off, and the second transistor Q2 is turned on.

[0049] In addition, during the discharge process of the first inductor L1, the released energy also makes the base voltage of the second transistor Q2 greater than the emitter voltage, and the clamping voltage of the first diode D1 avoids the be reverse voltage damage of the second transistor Q2. The current of the first inductor L1 can be calculated according to the following formula:

[0050]

[0051] Where I represents the current of the first inductor, VCC represents the supply voltage of the full-bridge circuit, VL represents the driving voltage of the first inductor on the first bridge arm, L represents the inductance of the first inductor, R represents the resistance value connected in series with the first inductor, Imax represents the maximum current of the first inductor, and Ton represents the duration of the increase in the current of the first inductor. It should be noted that if there are multiple resistors connected in series with the first inductor, R is the resistance value of all the resistors connected in series with the first inductor.

[0052] Therefore, by selecting an appropriate size for the first inductor L1, the above configuration ensures that when the first driver transistor Q6 is off, the first diode D1 is always on, and the first transistor Q1 is also always off. This allows the full-bridge circuit to convert the PWM waveform to a high-frequency target frequency waveform. This allows the power conversion device to achieve high-frequency operation of the RF beauty instrument in a non-isolated manner, meeting the various user application requirements. Similarly, the second input terminal and the second bridge arm drive circuit operate in the same manner as the first input terminal and the first bridge arm drive circuit described above, and the embodiments of the present invention will not be described in detail here.

[0053] Furthermore, the beauty instrument body is also provided with a button module connected to the control module, such as Figure 8 As shown, the button module includes a switch button unit 61 and a gear button unit 62; Figure 9 As shown, the gear button unit 62 includes a high-gear button 621, a middle-gear button 622 and a low-gear button 623; for example, the low-gear button 623 can enable the RF beauty instrument to output an RF waveform below 3M, the middle-gear button 622 can enable the RF beauty instrument to output an RF waveform of 3M, and the high-gear button 621 can enable the RF beauty instrument to output an RF waveform exceeding 3M, etc.; the switch button unit includes a switch button 611, where the switch button 611 can be a movable switch button, or a seesaw button, or a touch button. The specific form of the switch button can be set according to actual conditions, and the embodiment of the present invention does not limit this.

[0054] In addition, a switch indicator light and a gear indicator light are also provided on the beauty instrument body; wherein the switch indicator light is provided within a preset distance range of the switch button unit, such as Figure 8 As shown, the switch indicator light 612 is set below the switch button 611. The gear indicator light is set within the preset distance range of the gear button unit to indicate the gear information when the radio frequency beauty instrument is working; the gear indicator light includes a high gear button indicator light, a middle gear button indicator light and a low gear button indicator light, as shown in FIG. Figure 9As shown, the gear indicator light can be set to the right of the corresponding gear button, or to the position below the corresponding gear button, etc., and can be set specifically according to actual conditions. In actual applications, the gear information of the radio frequency beauty instrument when it is working can be indicated by the corresponding gear button indicator light. For example, if the indicator light to the right of the low gear button is on, it means that the radio frequency beauty instrument is working in the low gear at this time; the gear information of the radio frequency beauty instrument when it is working can also be indicated by the number of indicator lights. For example, if one indicator light is on, it means that the radio frequency beauty instrument is working in the low gear at this time, if two indicator lights are on, it means that the radio frequency beauty instrument is working in the middle gear at this time, and if all indicator lights are on, it means that the radio frequency beauty instrument is working in the high gear at this time, etc. The specific display mode of the indicator light can be set according to actual conditions, and the embodiment of the present invention does not limit this description.

[0055] In addition, if Figure 8 As shown, the beauty head is provided with multiple electrode pads 71, and the multiple electrode pads 71 are evenly distributed according to the shape of the beauty head. The shape of the beauty head can be one of the following: circular, oval, heart-shaped, and square. The specific shape can be set according to actual conditions and is not limited to this embodiment of the present invention. In actual application, the electrode pads are mostly gold-plated copper die-castings, connected to the power conversion circuit via wires, and their outer parts contact the user's skin to conduct current. Therefore, the first RF waveform or the second RF waveform output by the power conversion circuit acts on the user's skin through the electrode pads, realizing the function of the radio frequency beauty device.

[0056] As well as Figure 8 As shown, the bottom of the beauty instrument body is provided with a charging port 81 for connecting to the mains electricity to charge the RF beauty instrument. In actual application, the charging port 81 can be a TYPE-C charging port to connect to the mains electricity through a standard 5V charger to charge the RF beauty instrument.

[0057] Further, such as Figure 10 As shown, the beauty instrument body is also provided with a breathing marquee 91 for indicating the working status of the radio frequency beauty instrument; that is, in actual application, when the radio frequency beauty instrument is working, the breathing marquee 91 is displayed in the form of breathing marquees, such as lighting up with a breathing marquee at a frequency of 0.5 Hz, etc., thereby increasing the appearance effect of the radio frequency beauty instrument and improving the user's interest in using the radio frequency beauty instrument.

[0058] Furthermore, the RF beauty device also includes a base having a groove formed thereon that matches the shape of the bottom of the device body. In practice, to facilitate user use of RF beauty devices, the devices are generally designed to be grippable. Therefore, the shape of the groove on the base only needs to match the shape of the bottom of the device body. This allows the RF beauty device to be securely placed on the base when not in use, making it easy for the user to store it, thereby improving the user experience.

[0059] In addition, in the description of the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0060] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0061] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0062] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-described embodiments within the technical scope disclosed by the present invention, or replace some of the technical features therein with equivalents. Such modifications, changes, or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A power conversion device, characterized in that: The power conversion device is applied to a radio frequency beauty instrument; wherein the power conversion device includes a full-bridge circuit, and an input interface and an output interface connected to the full-bridge circuit; The full-bridge circuit is used to obtain the PWM waveform output by the control module in the radio frequency beauty instrument through the input interface, convert the PWM waveform into a target frequency waveform, and output the target frequency waveform through the output interface; the target frequency waveform is a high-frequency waveform; The full-bridge circuit includes a complementary first bridge arm and a second bridge arm, the input interface includes a first input end and a second input end, and the output interface includes a first output end and a second output end; the first bridge arm is connected to the first input end and the first output end respectively, and the second bridge arm is connected to the second input end and the second output end respectively, and the first input end and the second input end are complementary, and the first output end and the second output end are complementary.

2. The power conversion device according to claim 1, wherein: The first bridge arm includes a first transistor and a second transistor, and the second bridge arm includes a third transistor and a fourth transistor; wherein the first transistor and the third transistor are both PNP transistors, and the second transistor and the fourth transistor are both NPN transistors.

3. A radio frequency beauty instrument, characterized in that: include: A beauty instrument body and a beauty head fixed to an end of the beauty instrument body; wherein the beauty instrument body is equipped with the power conversion device according to any one of claims 1 to 2, as well as a control module and a drive circuit, the control module, the drive circuit and the power conversion device being connected in sequence, and the power conversion device being further connected to the beauty head; The beauty head is provided with a collection module connected to the control module, for collecting skin parameters and sending the skin parameters to the control module; wherein the skin parameters include skin humidity parameters and / or skin temperature parameters; The control module pre-stores a mapping relationship between the skin parameters and the frequency waveform; The control module is used to receive the skin parameters, read the target frequency waveform corresponding to the received skin parameters from the mapping relationship; and output two complementary PWM waveforms with adjustable duty cycles corresponding to the target frequency waveform, and transmit the PWM waveform to the power conversion device through the drive circuit, so that the power conversion device converts the PWM waveform into the target frequency waveform, and applies the target frequency waveform to the skin through the beauty head.

4. The radio frequency beauty instrument according to claim 3, characterized in that: The radio frequency beauty instrument further includes a power supply module connected to the control module, the drive circuit and the power conversion device; The power supply module is used to supply power to the control module, the drive circuit and the power conversion device.

5. The radio frequency beauty instrument according to claim 3, characterized in that: The beauty instrument body is also provided with a button module connected to the control module, and the button module includes a switch button unit and a gear button unit; wherein the gear button unit includes a high gear button, a middle gear button and a low gear button.

6. The radio frequency beauty instrument according to claim 5, characterized in that: The beauty instrument body is also provided with a gear indicator light and a breathing marquee; The gear indicator light is arranged within a preset distance range of the gear button unit, and is used to indicate the gear information of the radio frequency beauty instrument when it is working; The breathing marquee is used to indicate the working status of the radio frequency beauty instrument.

7. The radio frequency beauty instrument according to claim 3, characterized in that: The beauty head is provided with a plurality of electrode sheets, and the plurality of electrode sheets are evenly distributed according to the shape of the beauty head; wherein the shape of the beauty head is one of the following: circular, oval, heart-shaped and square.

8. The radio frequency beauty instrument according to claim 3, characterized in that: A charging interface is provided at the bottom of the beauty instrument body for connecting to the mains electricity to charge the radio frequency beauty instrument.

9. The radio frequency beauty instrument according to claim 3, characterized in that: The radio frequency beauty instrument further comprises a base, and the base is provided with a groove that matches the shape of the bottom of the beauty instrument body.

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