Cosmetic instrument and ultrasonic transduction driving circuit thereof

Abstract

The utility model relates to the field of beauty instruments, and provides a beauty instrument and an ultrasonic transduction drive circuit thereof. The ultrasonic transduction drive circuit of the beauty instrument comprises a control unit, a control signal conversion unit, a push-pull inversion unit and an ultrasonic transduction unit. Wherein the control unit is connected with the control signal conversion unit, and the control signal conversion unit is connected with the push-pull inversion unit. A control unit is used for outputting a driving control signal, and a control signal conversion unit is used for outputting a first frequency signal and a second frequency signal which are complementary in frequency based on the driving control signal. The push-pull inversion unit generates alternating current for the ultrasonic transduction unit to work under the driving action of the first frequency signal and the second frequency signal, then ultrasonic energy is output through the ultrasonic transduction unit, and the ultrasonic energy can act on the deep layer of the skin. Compared with a related full-bridge push-pull inversion unit, the scheme of the utility model reduces electronic devices, does not need complex control logic, and is lower in implementation cost.

Description

Technical Field

[0001] This application belongs to the field of beauty devices, and in particular relates to a beauty device and its ultrasonic transducer drive circuit. Background Technology

[0002] As the variety of beauty devices on the market increases, users' demands for intelligent features are also rising. Currently available beauty devices can be categorized based on the physical energy they exert on the skin; for example, there are translucent beauty devices that output light energy and electrode-type beauty devices that output microcurrents. Some current beauty device solutions can trigger light energy, microcurrents, and even ultrasonic energy to act on the skin. Therefore, in order for a beauty device to output ultrasonic energy, a compatible alternating current supply must be provided to the ultrasonic transducer.

[0003] However, in related beauty device solutions, a full-bridge inverter unit can be used to output AC power to power an ultrasonic transducer for ultrasonic energy output. Since a full-bridge inverter unit requires at least four switching transistors, and multiple sets of drive signals are needed to drive each of the four transistors to output AC power, and its control scheme is complex and the hardware cost is high, the overall cost of the beauty device is relatively high. Utility Model Content

[0004] The purpose of this application is to provide a beauty device and its ultrasonic transducer drive circuit, which can enable the beauty device to output ultrasonic energy at a lower implementation cost.

[0005] The first aspect of this application provides an ultrasonic transducer drive circuit for a beauty device, comprising:

[0006] The control unit is used to output drive control signals;

[0007] A control signal conversion unit is connected to the control unit. The control signal conversion unit is used to output a first frequency signal and a second frequency signal with complementary frequencies based on the drive control signal.

[0008] The push-pull inverter unit is connected to the control signal conversion unit and is used to output AC power according to the first frequency signal and the second frequency signal.

[0009] The ultrasonic transducer unit is connected to the push-pull inverter unit. The ultrasonic transducer unit is used to operate based on alternating current and output ultrasonic energy.

[0010] The second aspect of this application provides a beauty device, including the ultrasonic transducer drive circuit of the beauty device provided in the first aspect.

[0011] The beneficial effects of this utility model embodiment compared with the prior art are as follows: The ultrasonic transducer drive circuit of the above-mentioned beauty device includes: a control unit, a control signal conversion unit, a push-pull inverter unit, and an ultrasonic transducer unit. The control unit is connected to the control signal conversion unit, and the control signal conversion unit is connected to the push-pull inverter unit. The control unit outputs a drive control signal to the control signal conversion unit, enabling the control signal conversion unit to output a first frequency signal and a second frequency signal with complementary frequencies based on the drive control signal. Under the action of the first and second frequency signals, the push-pull inverter unit outputs alternating current. Since the ultrasonic transducer unit is connected to the push-pull inverter unit, the ultrasonic transducer unit can operate using the alternating current output by the push-pull inverter unit, outputting ultrasonic energy. In the above solution, the control unit outputs a drive control signal, and the control signal conversion unit outputs a first frequency signal and a second frequency signal with complementary frequencies based on the drive control signal. Under the driving action of the first and second frequency signals, the push-pull inverter unit can generate alternating current capable of powering the ultrasonic transducer unit, thereby outputting ultrasonic energy through the ultrasonic transducer unit, and this ultrasonic energy can act on the deep layers of the skin. Compared to related full-bridge inverter units, it reduces electronic components, making the circuit structure and scale more streamlined. Moreover, it eliminates the need for complex control logic, enabling the beauty device to output ultrasonic energy at a lower cost. Attached Figure Description

[0012] Figure 1 A schematic diagram of the ultrasonic transducer drive circuit of a beauty device provided in this application embodiment;

[0013] Figure 2 A schematic diagram of the specific structure of the control signal conversion unit in the ultrasonic transducer drive circuit of a beauty device provided in this application embodiment. Figure 1 ;

[0014] Figure 3 A schematic diagram of the specific structure of the control signal conversion unit in the ultrasonic transducer drive circuit of a beauty device provided in this application embodiment. Figure 2 ;

[0015] Figure 4 Specific circuit diagram of the logic unit in the ultrasonic transducer drive circuit of a beauty device provided in this application embodiment. Figure 1 ;

[0016] Figure 5 Specific circuit diagram of the logic unit in the ultrasonic transducer drive circuit of a beauty device provided in this application embodiment. Figure 2 ;

[0017] Figure 6 The specific circuit of the control signal conversion unit in the ultrasonic transducer drive circuit of a beauty device provided in this application embodiment;

[0018] Figure 7 A schematic diagram of the specific structure of the push-pull inverter unit in the ultrasonic transducer drive circuit of a beauty device provided in this application embodiment;

[0019] Figure 8 A specific circuit diagram of the push-pull inverter circuit and the ultrasonic transducer unit in the ultrasonic transducer drive circuit of a beauty device provided in this application embodiment;

[0020] Figure 9 This application illustrates the specific circuit diagrams of the push-pull inverter unit, the first sampling unit, and the second sampling unit in the ultrasonic transducer drive circuit of a beauty device according to an embodiment of this application. Figure 1 ;

[0021] Figure 10 This application illustrates the specific circuit diagrams of the push-pull inverter unit, the first sampling unit, and the second sampling unit in the ultrasonic transducer drive circuit of a beauty device according to an embodiment of this application. Figure 2 ;

[0022] Figure 11 This is a schematic diagram of the structure of a beauty device provided in an embodiment of this application;

[0023] Figure 12 A schematic diagram of the ultrasonic transducer drive circuit of a beauty device provided in another embodiment of this application;

[0024] Figure 13 for Figure 12 Specific circuit diagrams of some embodiments Figure 1 ;

[0025] Figure 14 for Figure 12 Specific circuit diagrams of some embodiments Figure 2 ;

[0026] Figure 15 A schematic diagram of the ultrasonic transducer drive circuit of a beauty device provided in another embodiment of this application;

[0027] Figure 16 for Figure 15 Specific structural diagram of the third sampling unit in the embodiment Figure 1 ;

[0028] Figure 17 for Figure 16 A detailed circuit diagram of one embodiment of the third sampling unit in the examples;

[0029] Figure 18 for Figure 15 Specific structural diagram of the third sampling unit in the embodiment Figure 2 ;

[0030] Figure 19 for Figure 18 The specific circuit diagram of the third sampling unit in the embodiment. Detailed Implementation

[0031] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0032] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0033] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0035] As the variety of beauty devices on the market increases, users' demands for intelligent features are also rising. Currently available beauty devices can be categorized based on the physical energy they exert on the skin; for example, there are translucent beauty devices that output light energy and electrode-type beauty devices that output microcurrents. Some current beauty device solutions can trigger light energy, microcurrents, and even ultrasonic energy to act on the skin. Therefore, in order for a beauty device to output ultrasonic energy, a compatible alternating current supply must be provided to the ultrasonic transducer.

[0036] However, in related beauty device solutions, a full-bridge inverter unit is used to output AC power to power an ultrasonic transducer for ultrasonic energy output. Since the full-bridge inverter unit requires at least four switching transistors and multiple sets of drive signals to output AC power, and its control scheme is complex and the hardware cost is high, the overall cost of the beauty device is relatively high.

[0037] To address the aforementioned technical problems, this application provides a beauty device and its ultrasonic transducer drive circuit. The ultrasonic transducer circuit of the beauty device includes a control unit, a control signal conversion unit, a push-pull inverter unit, and an ultrasonic transducer unit. The control unit is connected to the control signal conversion unit, and the control signal conversion unit is connected to the push-pull inverter unit. The control unit outputs a drive control signal to the control signal conversion unit, enabling the control signal conversion unit to output a first frequency signal and a second frequency signal with complementary frequencies based on the drive control signal. Under the action of the first and second frequency signals, the push-pull inverter unit outputs alternating current. Since the ultrasonic transducer unit is connected to the push-pull inverter unit, the ultrasonic transducer unit can operate using the alternating current output by the push-pull inverter unit, outputting ultrasonic energy.

[0038] The above solution utilizes a control unit to output a drive control signal. Based on this drive control signal, a control signal conversion unit outputs a first frequency signal and a second frequency signal with complementary frequencies. Driven by the first and second frequency signals, a push-pull inverter unit generates alternating current capable of powering the ultrasonic transducer unit. This ultrasonic transducer unit then outputs ultrasonic energy, which can act on the deep layers of the skin. Compared to related full-bridge inverter units, this solution reduces electronic components, resulting in a simpler circuit structure and scale. Furthermore, it eliminates the need for complex control logic, enabling the beauty device to output ultrasonic energy at a lower implementation cost.

[0039] It is understood that the ultrasonic transducer drive circuit of the beauty device provided in this application embodiment can be specifically configured inside the beauty device handle (hereinafter referred to as the beauty device). Alternatively, it can be configured inside the control base or operating table where the beauty device handle is communicated. This application does not make any special limitations here, as long as it can support and implement the ultrasonic transducer drive circuit of the beauty device of this application.

[0040] See Figure 1 , Figure 1 A schematic diagram of the ultrasonic transducer drive circuit of a beauty device according to an embodiment of this application is shown. For ease of explanation, only the parts relevant to this embodiment are shown, and are described in detail below:

[0041] exist Figure 1In this beauty device, the ultrasonic transducer drive circuit 100 includes: a control unit 10, a control signal conversion unit 20, a push-pull inverter unit 30, and an ultrasonic transducer unit 40. Specifically:

[0042] Control unit 10 outputs drive control signals. Control signal conversion unit 20 is connected to control unit 10. Control signal conversion unit 20 outputs a first frequency signal and a second frequency signal with complementary frequencies based on the drive control signals. Push-pull inverter unit 30 is connected to control signal conversion unit 20. Push-pull inverter unit 30 outputs alternating current based on the first frequency signal and the second frequency signal. Ultrasonic transducer unit 40 is connected to push-pull inverter unit 30. Ultrasonic transducer unit 40 operates based on alternating current and outputs ultrasonic energy.

[0043] In this embodiment, since the control unit 10 is connected to the control signal conversion unit 20, when the control unit 10 outputs a drive control signal, the control signal conversion unit 20 can generate a first frequency signal and a second frequency signal with complementary frequencies based on the drive control signal. Here, the first frequency signal and the second frequency signal with complementary frequencies can be regarded as a drive signal pair, used to drive the push-pull inverter unit 30 to output corresponding AC power.

[0044] In a specific implementation, the control unit 10 can be a control circuit built on a processor. Correspondingly, the control signal conversion unit 20 can specifically include two frequency division branches, used to output complementary electrical signals according to the drive control signal, that is, outputting a first frequency signal and a second frequency signal with complementary frequencies. Here, frequency complementarity means that within a unit period, the levels of the first frequency signal and the second frequency signal are opposite to each other. For example, within a unit period, when the first frequency signal is high, the second frequency signal is low. Or, for example, within a unit period, when the first frequency signal is low, the second frequency signal is high.

[0045] For example, in a specific implementation, the push-pull inverter unit 30 may include a push-pull inverter circuit. It is readily understood that the push-pull inverter circuit includes a switching circuit consisting of at least two switching transistors, and a transformer connected to the switching circuit. Based on this, when outputting a first frequency signal and a second frequency signal with complementary frequencies to the push-pull inverter unit 30, the two switching transistors in the switching circuit can alternately conduct under the action of the first frequency signal and the second frequency signal, thereby alternately generating currents in opposite directions in the primary winding of the transformer, thus enabling the secondary winding of the transformer to output alternating current.

[0046] Upon receiving complementary first and second frequency signals, the two switching transistors in the push-pull inverter circuit are driven by the first and second frequency signals respectively, causing them to conduct alternately. Since the transformer in the push-pull inverter circuit generates electrical energy during the alternating conduction of the two switching transistors, AC power can be output to the ultrasonic transducer unit 40 through the secondary coil of the transformer. This allows the ultrasonic transducer unit 40 to operate based on this AC power, outputting ultrasonic energy.

[0047] For example, in a specific implementation, the ultrasonic transducer unit 40 may include an ultrasonic transducer that can output ultrasonic energy under the action of alternating current.

[0048] The above solution utilizes a control unit to output a drive control signal. Based on this drive control signal, a control signal conversion unit outputs a first frequency signal and a second frequency signal with complementary frequencies. Driven by the first and second frequency signals, a push-pull inverter unit generates alternating current capable of powering the ultrasonic transducer unit. This ultrasonic transducer unit then outputs ultrasonic energy, which can act on the deep layers of the skin. Compared to related full-bridge inverter units, this solution reduces electronic components, resulting in a simpler circuit structure and scale. Furthermore, it eliminates the need for complex control logic, enabling the beauty device to output ultrasonic energy at a lower implementation cost.

[0049] See Figure 2 , Figure 2 This illustration shows a schematic diagram of the control signal conversion unit in the ultrasonic transducer drive circuit of a beauty device according to an embodiment of this application. As one embodiment, the control signal conversion unit 20 includes: a high-frequency signal generation unit 21 and a logic unit 22. Specifically:

[0050] The high-frequency signal generation unit 21 is used to generate high-frequency signals based on the drive control signal. The logic unit 22, connected to the high-frequency signal generation unit, is used to convert the high-frequency signals into a first frequency signal and a second frequency signal with complementary frequencies.

[0051] In a practical implementation, the high-frequency signal generation unit 21 can communicate with the control unit 10 via I2C, that is, receive the drive control signal output by the control unit 10. This drive control signal may include a clock portion and a data portion. The high-frequency signal generation unit 21 can output a high-frequency signal based on the clock and data portions. Therefore, in actual implementation, the clock and data portions of the initial control signal can be configured by the control unit 10, thereby achieving adjustment of the frequency, amplitude, etc., of the high-frequency signal.

[0052] As an example, the high-frequency signal generation unit 21 may specifically include a clock crystal oscillator and a frequency synthesizer. The clock crystal oscillator can generate a 25 MHz frequency signal and output this frequency signal to the frequency synthesizer. That is, the clock crystal oscillator serves as the high-frequency signal source for the frequency synthesizer. For example, the frequency synthesizer outputs a 4 MHz high-frequency signal based on the drive control signal and the 25 MHz frequency signal.

[0053] In this embodiment, the logic unit 22 can be implemented using logic gate circuits. For example, the logic gate circuit includes at least two signal output branches. One of the signal output branches is used to flip the level of the high-frequency signal, and the output frequencies of the two signal output branches are the same, thereby outputting a first frequency signal and a second frequency signal with complementary frequencies.

[0054] In this embodiment, by using a high-frequency signal generation unit in combination with a logic unit, a first frequency signal and a second frequency signal with complementary frequencies can be output. That is, frequency division of the frequency signal can be achieved with low hardware cost, and a pair of complementary frequency signals can be obtained to control the push-pull inverter unit.

[0055] Figure 3 This illustration shows the specific structure of the control signal conversion unit in the ultrasonic transducer drive circuit of a beauty device according to an embodiment of this application. Figure 2 As one embodiment, the logic unit 22 of the control signal conversion unit 20 includes a first branch 221 and a second branch 222. Figure 3 As shown, the input terminal of the first branch 221 is connected to the input terminal of the second branch 222, forming a signal transmission node P. The signal transmission node P is used to connect to the high-frequency signal generation unit 21. The first branch 221 is used to output a first frequency signal based on the high-frequency signal. The second branch 222 is used to output a second frequency signal based on the high-frequency signal.

[0056] In a practical implementation, both the first branch 221 and the second branch 222 can be branches composed of logic gates. The first branch 221 and the second branch 222 are connected to the high-frequency signal generation unit 21 through the signal transmission node P, and can thus simultaneously receive the high-frequency signal transmitted by the high-frequency signal generation unit 21.

[0057] In this embodiment, the high-frequency signal generated by the high-frequency signal generation unit can be divided by the first branch and the second branch. Complementary signal pairs can be output based on a set of high-frequency signals without the need to add a signal source or clock source, resulting in lower cost and higher stability.

[0058] Figure 4 This application illustrates the specific circuit of the logic unit in the ultrasonic transducer drive circuit of a beauty device according to an embodiment of the present application. Figure 1As one embodiment, the first branch 221 includes a NAND gate and a first AND gate AND1. Specifically, the input of the NAND gate is connected to the signal transmission node P, and the output of the NAND gate is connected to the input of the first AND gate AND1. The output of the first AND gate AND1 is used to output a first frequency signal. The second branch 222 includes a second AND gate AND2 and a third AND gate AND3. The input of the second AND gate AND2 is connected to the signal transmission node P, and the output of the second AND gate AND2 is connected to the input of the third AND gate AND3. The output of the third AND gate AND3 is used to output a second frequency signal.

[0059] In this embodiment, the input of the NAND gate is connected to the signal transmission node P, which can output the high-frequency signal in reverse. The input of the AND gate AND2 is connected to the signal transmission node P, which can output the high-frequency signal in forward direction.

[0060] In practical implementation, since AND gates typically have two input terminals, the other input terminal of the first AND gate AND1, the other input terminal of the second AND gate AND2, and the other input terminal of the third AND gate AND3 are all used to input high-frequency signals. For example, the other input terminals of the first AND gate AND1, the second AND gate AND2, and the third AND gate AND3 are all connected to the signal transmission node P.

[0061] Figure 5 This application illustrates the specific circuit of the logic unit in the ultrasonic transducer drive circuit of a beauty device according to an embodiment of the present application. Figure 2 .and Figure 4 The difference in the illustrated embodiments is that, Figure 5 In the embodiment shown, the first branch 221 and the second branch 222 are respectively provided with dead zone setting circuits.

[0062] Combination Figure 3 and Figure 5 As one embodiment, the first branch 221 further includes a first dead-time setting circuit 23 connected between the NAND gate and the first AND gate AND1. The second branch 222 further includes a second dead-time setting circuit 24 connected between the second AND gate AND2 and the third AND gate AND3.

[0063] In this embodiment, the high-frequency signal generation unit 21 transmits the high-frequency signal to the first branch 221 and the second branch 222 through the signal transmission node P. The period of the high-frequency signal can be considered as a unit period. Accordingly, the first dead-time setting circuit 23 is used to configure the first dead-time within the unit period, and the second dead-time setting circuit 24 is used to configure the second dead-time within the unit period. Furthermore, the first dead-time and the second dead-time are complementary within the unit period.

[0064] In this embodiment, a first dead-time setting circuit is set in the first branch and a second dead-time setting circuit is set in the second branch. This ensures that the output first frequency signal and the second frequency signal are complementary, thereby avoiding the simultaneous conduction of the switching transistors in the push-pull inverter circuit, preventing the burning out of the switching transistors in the push-pull inverter circuit, and improving the overall stability of the circuit.

[0065] Figure 6 This illustration shows the specific circuit of the control signal conversion unit in the ultrasonic transducer drive circuit of a beauty device according to an embodiment of this application. (Combined with...) Figures 2 to 6 For example, the high-frequency signal generation unit 21 may include a crystal oscillator Y1 and a frequency synthesizer U11. The crystal oscillator Y1 can provide a frequency signal, such as a 25 MHz frequency signal, to the frequency synthesizer U11. The frequency synthesizer U11 is connected to the control unit via I2C connectors (SCL, SDA) and thus receives the initial control signal sent by the control unit. The frequency synthesizer U11 can output a 4 MHz high-frequency signal through the signal transmission node P based on the initial control signal and the 25 MHz frequency signal.

[0066] Referring to the examples above, see Figure 2 and Figure 6 Chip U9 is a NAND gate, while chips U10, U12, and U13 are all AND gates. Therefore, the branch containing chips U9 and U10 can be considered the first branch 221, and the branch containing chips U12 and U13 can be considered the second branch 222. Figure 6 In this circuit, the first dead-time setting circuit 23 includes diode D12, resistor R31, and capacitor C60. After chip U9 outputs the high-frequency signal in reverse, the first dead-time is set via the first dead-time setting circuit 23 and then transmitted to chip U10, which outputs a 4 MHz first frequency signal. Similarly, the second dead-time setting circuit 24 includes diode D13, resistor R34, and capacitor C62. After chip U12 outputs the high-frequency signal in forward direction, the second dead-time is set via the second dead-time setting circuit 24 and then transmitted to chip U13, which outputs a 4 MHz second frequency signal.

[0067] Figure 7This illustration shows a schematic diagram of the push-pull inverter unit in the ultrasonic transducer drive circuit of a beauty device according to an embodiment of this application. As an embodiment, the push-pull inverter unit 30 includes a drive unit 31 and a push-pull inverter circuit 32. Specifically, the drive unit 31 is connected to a control signal conversion unit 20 and is used to output a first drive signal and a second drive signal based on a first frequency signal and a second frequency signal, wherein the frequencies of the first drive signal and the second drive signal are complementary. The push-pull inverter circuit 32 includes a transformer T1 and is connected to the drive unit 31. The push-pull inverter circuit 32 is used to output alternating current based on the first drive signal and the second drive signal.

[0068] Combination Figure 3 and Figure 7 As one embodiment, the drive unit 31 is configured with a first input terminal IN1, a second input terminal IN2, a first output terminal OUT1, and a second output terminal OUT2. The first input terminal IN1 and the second input terminal IN2 are respectively connected to the control signal conversion unit 20, and the first output terminal OUT1 and the second output terminal OUT2 are respectively connected to the push-pull inverter circuit 32. The push-pull inverter circuit 32 is configured with a first controlled terminal (not shown in the figure), a second controlled terminal (not shown in the figure), a first output terminal, and a second output terminal. The first controlled terminal is connected to the first output terminal OUT1 of the drive unit 31, and the second controlled terminal is connected to the second output terminal OUT2 of the drive unit 31. The first output terminal and the second output terminal of the push-pull inverter circuit 32 are both connected to the ultrasonic transducer unit 40.

[0069] As one embodiment, the push-pull inverter circuit 32 includes a transformer T1, a first drive branch 321, and a second drive branch 322. The input terminal of the first drive branch 321 serves as the first controlled terminal of the push-pull inverter circuit 32, and its output terminal is connected to the first primary winding of the transformer T1. The input terminal of the second drive branch 322 serves as the second controlled terminal of the push-pull inverter circuit 32, and its output terminal is connected to the second primary winding of the transformer T1. The first secondary winding of the transformer T1 serves as the first output terminal, and the second secondary winding of the transformer T1 serves as the second output terminal.

[0070] Here, the drive unit 31 outputs a first frequency signal to the first controlled terminal of the push-pull inverter circuit 32 through the first output terminal OUT1, and outputs a second frequency signal to the second controlled terminal of the push-pull inverter circuit 32 through the second output terminal OUT2. Based on this, the alternating conduction control of the first drive branch 321 and the second drive branch 322 can be realized, causing the primary side of the transformer T1 to alternately generate currents in opposite directions, thereby outputting corresponding AC power through the secondary side of the transformer T1.

[0071] In this embodiment, since the first frequency signal and the second frequency signal are output by the logic unit based on a set of high-frequency signals, they are not only complementary in frequency but also have a native timing correlation. Based on this, the driving unit outputs a first driving signal and a second driving signal according to the first and second frequency signals, ensuring that they are not only complementary in frequency but also natively correlated in timing. This not only matches the driving requirements of the push-pull inverter circuit but also guarantees the stability of driving the push-pull inverter circuit.

[0072] In a specific implementation, the ultrasonic transducer unit 40 may include a matching unit and an ultrasonic transducer (not shown in the figure). Here, the matching unit is coupled between the secondary side of the transformer and the ultrasonic transducer, which is used to output ultrasonic energy according to the alternating current.

[0073] It is easy to understand that the matching unit is used to achieve impedance matching between the ultrasonic transducer and the push-pull inverter circuit. In specific implementation, the matching unit can be a circuit composed of existing inductive components, such as an LC circuit obtained by combining inductors and capacitors.

[0074] As one embodiment, the drive unit 31 further includes a power supply unit (not shown in the figure). Here, the power supply unit is connected to the primary side of the transformer and is used to supply power to the transformer T1.

[0075] In practical implementation, the power supply unit can be regarded as a preset power source used to supply power to transformer T1. For example, the power supply unit can be a current source or a voltage source, etc.

[0076] As one possible implementation, the power supply unit includes a voltage regulating branch for regulating the supply voltage.

[0077] Here, the voltage regulation branch can specifically include a voltage conversion circuit that can adjust the supply voltage to transformer T1 as needed. For example, the power supply unit can include a DC-DC voltage conversion circuit that can adjust the supply voltage to transformer T1 according to the different output ultrasonic energy. For example, the output voltage can be adjusted within the range of 12V to 3V.

[0078] As one embodiment, the ultrasonic transducer drive circuit provided in this embodiment further includes: a first sampling unit connected between the power supply unit and the primary side of the transformer.

[0079] It should be noted that since the voltage transformation amplitude or voltage transformation coefficient of transformer T1 is related to the number of turns of the coils on the primary and secondary sides, the electrical signal of the primary side of transformer T1 can be sampled, and the first sampled information can be used as the basis for judging whether the ultrasonic transducer unit 40 is working at the optimal frequency or optimal working state.

[0080] In a specific implementation, the first sampling unit can be connected to the primary side of transformer T1, specifically at the midpoint of the primary side of transformer T1, so as to sample the current and / or voltage of the primary side of transformer T1.

[0081] Figure 12 This illustration shows a schematic diagram of the ultrasonic transducer drive circuit of a beauty device according to another embodiment of this application. In conjunction with the previous embodiment, in this embodiment, the ultrasonic transducer drive circuit 100, in addition to including the first sampling unit 51, further includes an operational amplifier unit 52, a filtering unit 53, and a protection unit 54.

[0082] exist Figure 12 In this configuration, the input terminal of the operational amplifier unit 52 is connected to the output terminal of the first sampling unit 51, and the first terminal of the filtering unit 53 is connected to the output terminal of the operational amplifier unit 52. The second terminal of the filtering unit 53 is connected to the control unit 10 along with the protection unit 54.

[0083] In this embodiment, the filtering unit 53 is used to filter the electrical signal output by the operational amplifier unit 52. The protection unit 54 is used to limit the magnitude of the electrical signal output by the operational amplifier unit 52 to the control unit 10 through the filtering unit. In this way, not only can the electrical signal output by the operational amplifier unit 52 be filtered by the filtering unit 53, but the control unit 10 can also be protected by the protection unit 54, thereby improving the overall stability of the circuit.

[0084] Figure 13 It shows Figure 12 Specific circuit diagrams of some embodiments Figure 1 .like Figure 13 As shown in the figure, as an embodiment, the sampling unit 51 includes: a first sampling resistor R3, a second sampling resistor R4, a third sampling resistor R5, and a fifth capacitor C5; the first end of the first sampling resistor R3 is connected to the first end of the third sampling resistor R5 to form a first sampling node, which is used to connect to the primary side center tap P5 of the transformer T1; the second end of the first sampling resistor R3 is connected to the first end of the second sampling resistor R4; the second end of the second sampling resistor R4 is connected to the first end of the fifth capacitor C5; and the second end of the third sampling resistor R5 and the second end of the fifth capacitor C5 are both connected to the operational amplifier unit 52.

[0085] like Figure 13 As shown, in one embodiment, the operational amplifier unit 52 includes a first operational amplifier U3. The negative input terminal IN- of the operational amplifier U3 is connected to the second terminal of the fifth capacitor C5, the positive input terminal IN+ of the first operational amplifier U3 is connected to the first terminal of the fifth capacitor C5, and the output terminal of the first operational amplifier U3 serves as the output terminal of the operational amplifier unit 52.

[0086] In this embodiment, a filter capacitor C52 can also be connected to the voltage input terminal of the first operational amplifier U3 to filter the voltage input to the first operational amplifier U3 and ensure the working stability of the first operational amplifier U3.

[0087] like Figure 13 As shown, the filter unit 53 includes a filter resistor R53 and a filter capacitor C53. The first end of the filter resistor R53 serves as the first end of the filter unit 53, and the node formed by connecting the second end of the filter resistor R53 and the first end of the filter capacitor C53 serves as the second end of the filter unit 53. The second end of the filter capacitor C53 is grounded.

[0088] like Figure 13 As shown, the protection unit 54 includes a Zener diode D54, which is connected between the second terminal of the filter unit 53 and ground. In this embodiment, the Zener diode D54 is connected between the second terminal of the filter unit 53 and ground. When a circuit fault or other abnormality causes excessive voltage at the connection point between the filter unit 53 and the control unit 10, the Zener diode D54 will activate its protection function, thereby limiting the voltage at the node connecting the filter unit 53 and the control unit 10 to a safe range. This prevents the control unit 10 from receiving excessive electrical signals and being damaged, thus improving the overall circuit safety.

[0089] Figure 14 for Figure 12 Specific circuit diagrams of some embodiments Figure 2 .and Figure 13 The difference in the embodiment shown is that the first sampling unit 51 in this embodiment can also be connected to the power supply unit.

[0090] Combining the examples above, such as Figure 13 As shown, the power supply unit can specifically be a voltage conversion circuit, which can be connected to the first sampling resistor R3 in the first sampling unit 51, that is, to provide voltage to the center tap of the transformer T1 through the first sampling resistor R3. At the same time, the control unit 10 can control the voltage output of the voltage conversion circuit through the controlled terminal BUCK_PWM of the voltage conversion circuit, that is, it can control the voltage conversion circuit to output DC voltages of different voltages sequentially.

[0091] exist Figure 14In this circuit, chip U26 can be either a boost or buck converter. After receiving the voltage to be converted via a power supply of VDD+12V, it outputs the converted voltage to the first sampling resistor R3 through capacitor C104, inductor L4, and a parallel capacitor circuit (C5, C7, C45, C46, ​​C2). When control unit 10 controls the DC voltage output by the voltage conversion circuit via the controlled terminal BUCK_PWM, it specifically controls the voltage at one end of capacitor C106. Here, since one end of capacitor C106 is connected to the connection node of inductor L4 and the parallel capacitor circuit, and its other end is connected to the controlled terminal BUCK_PWM of the voltage conversion circuit via resistors R94 and R95, control unit 10 can control the voltage at the other end of capacitor C106 by controlling the voltage at the controlled terminal BUCK_PWM of the voltage conversion circuit. This changes in the voltage of capacitor C106 affect the voltage value output through the parallel capacitor circuit (C5, C7, C45, C46, ​​C2). It is easy to understand that, in actual implementation, the voltage change circuit can also be implemented using other existing buck and / or boost circuits, and there are no restrictions here.

[0092] As one embodiment, the ultrasonic transducer drive circuit provided in this embodiment further includes: a second sampling unit connected to the secondary side of the transformer.

[0093] Similar to the above embodiments, in actual implementation, the second sampling unit is connected to the secondary side of transformer T1, specifically at the node where the secondary side of the transformer connects to the ultrasonic transducer H1. This allows for electrical signal sampling of the ultrasonic energy output process of the ultrasonic transducer 40, and the obtained second sampling information is used as a basis for determining whether the ultrasonic transducer 40 is operating at the optimal frequency or in its optimal operating state.

[0094] In a practical implementation, the second sampling unit may include a current / voltage sampling circuit, which may be connected to the secondary side of the transformer. For example, the second sampling unit can be connected to the secondary side of the transformer via a matching circuit. Alternatively, the second sampling unit may be connected at the connection node between the secondary side of the transformer and the transducer.

[0095] As one possible implementation, the control unit 10 is also used to determine whether the ultrasonic transducer 40 is operating at the optimal frequency or in the optimal operating state based on the first sampling information obtained by the first sampling unit and / or the second sampling information obtained by the second sampling unit.

[0096] Figure 8 This document illustrates a detailed circuit diagram of the push-pull inverter circuit and the ultrasonic transducer unit in the ultrasonic transducer drive circuit of a beauty device according to an embodiment of this application. Figure 8As shown, the first driving branch 321 includes: a first switch Q1, a first capacitor C1, and a first resistor R1. The second driving branch includes: a second switch Q2, a second capacitor C2, and a second resistor R2.

[0097] like Figure 8 As shown, the controlled terminal of the first switch Q1 serves as the input terminal of the first drive branch 321. The high-potential terminal of the first switch Q1 is connected to the first capacitor C1, forming the first node P1. The first node P1 serves as the output terminal of the first drive branch. The second terminal of the first capacitor C1 is connected to the first terminal of the first resistor R1. The second terminal of the first resistor R1 and the low-potential terminal of the first switch Q1 are both grounded. The controlled terminal of the second switch Q2 serves as the input terminal of the second drive branch 322. The high-potential terminal of the second switch Q2 is connected to the second capacitor C2, forming the second node P2. The second node P2 serves as the output terminal of the second drive branch 322. The second terminal of the second capacitor C2 is connected to the first terminal of the second resistor R2. The second terminal of the second resistor R2 and the low-potential terminal of the second switch Q2 are both grounded.

[0098] like Figure 8 As shown, the matching unit includes a first inductor L1 and a third capacitor C3. The first end of the first inductor L1 serves as the first end of the matching unit, connecting to the first secondary side of transformer T1. The second end of the first inductor L1 is connected to the first end of the third capacitor C3, forming a third node P3. The second end of the third capacitor C3 serves as the second end of the matching unit, connecting to the second secondary side of transformer T1, forming a fourth node P4. The first end of the ultrasonic transducer H1 is connected to the third node P3, and the second end of the ultrasonic transducer is connected to the fourth node P4.

[0099] In this embodiment, the first switch is turned on and off in a regular manner according to the first driving signal, and the second switch is turned on and off in a regular manner according to the second driving signal, thereby alternately generating currents in different directions on the primary winding of the transformer. Under the influence of the primary current, the secondary winding of the transformer generates alternating current, and under the LC matching circuit composed of the first inductor and the third capacitor, it forms an inductive / capacitive reactance match with the ultrasonic transducer. This not only improves the compatibility between the ultrasonic transducer and the circuit, but also provides a basis for the ultrasonic transducer to operate at the optimal frequency / optimal operating state.

[0100] Figure 15 This is a schematic diagram of the ultrasonic transducer drive circuit of a beauty device, provided as another embodiment of this application. Figure 15 In the process, the ultrasonic transducer drive circuit 100 also includes a third sampling unit 60.

[0101] Combination Figure 8 and Figure 15The third sampling unit 60 is specifically connected to the matching unit in the control unit 10 and the ultrasonic transducer unit 40. The third sampling unit 60 is used to sample the electrical signal output by the matching unit to obtain sampling information and feed it back to the control unit 10.

[0102] In this embodiment, the end of the third sampling unit 60 connected to the matching unit is the signal sampling end, and the end of the third sampling unit 60 connected to the control unit 10 is the signal feedback end.

[0103] Figure 16 It shows Figure 15 Specific structural diagram of the third sampling unit in the embodiment Figure 1 .like Figure 16 As shown, the third sampling unit 60 includes a sampling subunit 61, a detection subunit 62, a first filtering subunit 63, and an amplification subunit 64. The signal sampling terminal is grounded through the sampling subunit 61. The input terminal of the detection subunit 62 is connected to the signal sampling terminal B1. The output terminal of the detection subunit 62 is connected to the input terminal of the amplification subunit 64 through the first filtering subunit 63. The output terminal of the amplification subunit 64 is connected to the signal feedback terminal B2.

[0104] The working principle of the third sampling unit 60 in this embodiment is as follows: the sampling subunit 61 samples the electrical signal from the matching unit, and the detection subunit 62 detects the electrical signal sampled by the sampling subunit 61, allowing only the positive half-cycle of the sampled electrical signal to pass through, which serves as signal rectification; after detection, the DC signal obtained by the detection subunit 62 is subjected to high-frequency filtering by the first filtering subunit 63 to filter out high-frequency noise and interference signals in the DC signal, and then outputs it to the amplification subunit 64. The amplification subunit 64 amplifies the received electrical signal by a preset factor, and then outputs the amplified electrical signal from the signal feedback terminal B2 to the control unit 10. When different AC currents are output through transformer T1 according to different initial control signals from control unit 10, sampling subunit 61 of third sampling unit 60 samples electrical signals from matching unit. After detection processing by detection subunit 62, filtering processing by first filtering subunit 63, and amplification processing by amplification subunit 64, the signals are output from signal feedback terminal B2 to control unit 10. Thus, control unit 10 receives different sampling information, which represents different ultrasonic energy intensities of ultrasonic transducer H1. By comparing the received N sets of sampling information, control unit 10 can determine the set of initial control signals that maximizes the ultrasonic energy intensity of ultrasonic transducer H1, i.e., the optimal control signal. Then, control unit 10 can output the target AC current most suitable for ultrasonic transducer H1 through push-pull inverter unit 30 by outputting the optimal control signal, so that ultrasonic transducer H1 operates at the optimal frequency. In this way, the energy conversion efficiency of ultrasonic transducer H1 is improved, and the service life of ultrasonic transducer H1 is guaranteed or increased.

[0105] like Figure 17 As shown, Figure 17 for Figure 16 A specific circuit diagram of the third sampling unit in this embodiment. In this embodiment, the sampling subunit 61 includes a sampling resistor R01, which is connected between the signal sampling terminal B1 and ground.

[0106] The detector subunit 62 includes a detector capacitor C05, a detector resistor R02, and a third diode D3. The first terminal of the detector capacitor C05 is the input terminal of the detector subunit 62, the second terminal of the detector capacitor C05 is connected to the anode of the third diode D3, the anode of the third diode D3 is grounded through the detector resistor R02, and the cathode of the third diode D3 is the output terminal of the detector subunit 62.

[0107] The first filtering subunit 63 includes a first filtering capacitor C6, a second filtering capacitor C7, a first filtering resistor R03, and a second filtering resistor R04. The first end of the first filtering capacitor C6 is connected to the output terminal of the detector subunit 62, and the second end of the first filtering capacitor C6 is grounded. The first filtering resistor R03 is connected in parallel with the first filtering capacitor C6. The first end of the second filtering resistor R04 is connected to the first end of the first filtering capacitor C6, and the second end of the second filtering resistor R04 is connected to the input terminal of the amplification subunit 64. The first end of the second filtering capacitor C7 is connected to the second end of the second filtering resistor R04, and the other end of the second filtering capacitor C7 is grounded.

[0108] The amplification subunit 64 includes a third operational amplifier U03, a first reference resistor R05, and a second reference resistor R06. The positive input pin of the third operational amplifier U03 is the input terminal of the amplification subunit 64, and the negative input pin of the third operational amplifier U03 is grounded through the first reference resistor R05. The output pin of the third operational amplifier U03 is connected to the negative input pin of the third operational amplifier U03 through the second reference resistor R06, and the output pin of the third operational amplifier U03 is the output terminal of the amplification subunit 64. The power supply pin of the third operational amplifier U03 can be grounded through a decoupling capacitor to remove noise on the power supply pin and ensure the stability and accuracy of the operation of the third operational amplifier U03.

[0109] The circuit working principle of the third sampling unit 60 in this embodiment is as follows: the signal sampling terminal B1 is grounded through the sampling resistor R01, and the current in the circuit loop formed by the output side of the ultrasonic transducer drive circuit and the ultrasonic transducer is sampled through the sampling resistor R01; the input terminal of the detection subunit 62 receives the sampling signal (voltage signal across the sampling resistor R01) from the signal sampling terminal B1. After the sampling signal is AC coupled by the detection capacitor C05 and the detection resistor R02, it is rectified by the third diode D3 (i.e., the detection diode) to obtain a DC signal. The DC signal output by the detection subunit 62 is subjected to high-frequency filtering processing by the filtering circuit composed of the first filter capacitor C06, the first filter resistor R03, the second filter resistor R04, and the second filter capacitor C07, filtering out the third diode D3. 3. High-frequency noise during rectification is eliminated to obtain a clean DC signal, which is then output to the positive input pin of the third operational amplifier U03. The third operational amplifier U03 amplifies the DC signal by a preset factor (wherein, the amplification factor of the third operational amplifier U03 is determined by the resistance ratio of the first reference resistor R05 and the second reference resistor R06. Since the resistance of the sampling resistor R01 is usually very small, the voltage signal across the sampling resistor R01 will be very small, and the DC signal obtained after filtering will be very small, such as tens of millivolts. Therefore, it is necessary to use the third operational amplifier U03 for amplification. The amplified signal can be better recognized by the port of the control unit 10). The amplified signal is output to the control unit 10 through the signal feedback terminal B2, so that the control unit 10 receives the sampling information corresponding to the current initial control signal.

[0110] After receiving the sampling information, the control unit 10 calculates the operating current of the ultrasonic transducer H1 corresponding to the sampling information based on the resistance value of the sampling resistor R01 and the amplification factor of the third operational amplifier U03. Thus, by sequentially outputting N sets of initial control signals, the control unit 10 can sequentially obtain the operating current of the ultrasonic transducer H1 corresponding to each of the N sets of initial control signals. The magnitude of the operating current of the ultrasonic transducer H1 directly reflects the ultrasonic energy intensity of the ultrasonic transducer H1. The larger the operating current, the greater the ultrasonic energy intensity of the ultrasonic transducer H1. Therefore, the control unit 10 can use the set of initial control signals that achieves the maximum operating current of the ultrasonic transducer H1 as the optimal control signal to drive the ultrasonic transducer H1 to work, thereby improving the energy conversion efficiency of the ultrasonic transducer H1 and ensuring or increasing the service life of the ultrasonic transducer H1.

[0111] Of course, in other embodiments, the sampling subunit 61, the detection subunit 62, the first filtering subunit 63, and the amplification subunit 64 can all be circuits that achieve the same function, composed of other components and other connection methods.

[0112] like Figure 18 As shown, Figure 18A schematic diagram of the specific structure of the third sampling unit of the ultrasonic transducer drive circuit of a beauty device provided in this application. Figure 2 In this embodiment, the third sampling unit 60 is... Figure 15 or Figure 16 Based on the circuit structure of the embodiment shown, the third sampling unit 60 further includes a second filtering subunit 65 and a limiting subunit 66. The output terminal of the amplification subunit 64 is connected to the signal feedback terminal B2 via the second filtering subunit 65, and the limiting subunit 66 is connected to the signal feedback terminal B2 to limit the magnitude of the electrical signal output from the signal feedback terminal B2 to the control unit 10.

[0113] In this embodiment, considering that the electrical signal output from the amplification subunit 64 may be affected by some high-frequency noise and interference signals, a second filtering subunit 65 is added between the output of the amplification subunit 64 and the signal feedback terminal B2 to improve the accuracy of the electrical signal received by the control unit 10 from the signal feedback terminal B2 of the third sampling unit 60. This filtering subunit 65 filters out high-frequency noise and interference signals during this signal transmission process. Furthermore, since the ports of the control unit 10 (such as the I / O ports of a microcontroller or chip) have a maximum withstand voltage (e.g., 3.3V, 5V), the received electrical signal cannot exceed this maximum withstand voltage, otherwise it will damage the control unit 10. Therefore, in this embodiment, a limiting subunit 66 is connected to the signal feedback terminal B2. The limiting subunit 66 limits the magnitude of the electrical signal output from the signal feedback terminal B2 to the control unit 10, ensuring that it does not exceed the maximum withstand voltage of the control unit 10's port. This ensures the safe operation of the control unit 10 and improves the overall circuit safety.

[0114] like Figure 19 As shown, Figure 19 for Figure 18The specific circuit diagram of the third sampling unit 60 in this embodiment is shown below. In this embodiment, the second filtering subunit 65 includes a first output resistor R07 and a first output capacitor C8. The first end of the first output resistor R07 is connected to the output terminal of the amplification subunit 64, and the second end of the first output resistor R07 is connected to the signal feedback terminal B2 and grounded through the first output capacitor C8. The first output capacitor C8 and the first output resistor R07 form an RC filter circuit to filter the electrical signal output from the output terminal of the amplification subunit 64 (i.e., the output pin of the third operational amplifier U3), filtering out high-frequency interference signals and high-frequency noise signals, and ensuring that the electrical signal received by the control unit 10 from the signal feedback terminal B2 is more accurate. In this embodiment, the limiting subunit 66 includes a Zener diode Z, which is connected between the signal feedback terminal B2 and ground. By connecting the Zener diode Z to the signal feedback terminal B2, when a circuit fault or other abnormality causes the voltage at the signal feedback terminal B2 to be too high, the Zener diode Z will activate its protection function to limit the voltage at the signal feedback terminal B2 to a safe range, thereby preventing the control unit 10 from receiving excessive electrical signals from the signal feedback terminal B2 and being damaged, thus improving the overall circuit safety.

[0115] Of course, in some other embodiments, the second filter subunit 65 may also be a filtering circuit composed of other components, and the limiting subunit 66 may also include other devices or circuits with voltage limiting protection.

[0116] The above Figures 15 to 19 In the embodiment, the control unit 10 only needs to sample the signal (electrical signal) sampled from the output side of the ultrasonic transducer drive circuit by the third sampling unit 60 to accurately determine the working state of the ultrasonic transducer and thus determine the optimal control signal. Compared with simultaneously sampling the electrical signals of the primary and secondary sides of the transformer T1 of the ultrasonic transducer drive circuit, the overall circuit structure of the third sampling unit 60 is simpler, and the control unit 10 needs to process less sampling information, which simplifies the overall structure of the ultrasonic transducer drive circuit 100 of the beauty device and reduces the computing power requirement of the control unit 10.

[0117] Figure 9 This application illustrates the specific circuit diagrams of the push-pull inverter unit, the first sampling unit, and the second sampling unit in the ultrasonic transducer drive circuit of a beauty device according to an embodiment of this application. Figure 1 Combining Figures 7 to 9As one possible implementation, the driving unit 31 may include a driving chip U2. The first input pin of the driving chip U2 serves as the first input terminal IN1 of the driving unit 31, and the second input pin serves as the second input terminal IN2 of the driving unit 31. The first output pin of the driving chip U2 serves as the first output terminal OUT1 of the driving unit 31, and the second output pin serves as the second output terminal OUT2 of the driving unit 31. Here, the driving chip U2 outputs a first driving signal and a second driving signal based on the first frequency signal and the second frequency signal.

[0118] exist Figure 9 In this circuit, the power supply unit may include a preset power supply VDD. Here, the power supply VDD is connected to the first terminal of the fourth capacitor C4, forming the fifth node P5. The first terminal of the second inductor L2 is connected to the fifth node P5, and the second terminal of the second inductor L2 is connected to the center connection of the transformer T1. Here, the fifth node P5 can be regarded as a feed point. In a specific implementation, the first sampling unit can be connected to the fifth node P5 to sample the electrical signal of the primary side of the transformer T1.

[0119] As one possible implementation, the voltage terminal V_OUT of the driver chip U2 can be connected to a preset power supply VDD to adjust the voltage magnitude of VDD. The sampling terminal V_IN of the driver chip U2 can be connected to the fifth node P5, thereby obtaining the voltage and / or current of the primary side of transformer T1.

[0120] As one possible way to achieve this, in Figure 9 In this circuit, the first sampling unit includes a first sampling resistor R3, a second sampling resistor R4, a third sampling resistor R5, a fifth capacitor C5, a first operational amplifier U3, and an output resistor Rout. The node formed by connecting the first end of the first sampling resistor R3 and the first end of the third sampling resistor R5 is used to connect to the fifth node P5, or to connect to the center tap of the primary side of transformer T1. The second end of the first sampling resistor R3 is connected to the first end of the second sampling resistor R4, and the second end of the second sampling resistor R4 is connected to the first end of the fifth capacitor C5. The second end of the third sampling resistor R5 and the second end of the fifth capacitor C5 are both connected to the negative input terminal IN- of the first operational amplifier U3. The positive input terminal IN+ of the first operational amplifier U3 is connected to the first end of the fifth capacitor C5. The output terminal OUT of the first operational amplifier U3 is connected to the first end of the output resistor Rout, and the second end of the output resistor Rout is used to connect to the control unit 10.

[0121] As one possible way to achieve this, in Figure 9In the second sampling unit, there are: a first diode D3, a fourth sampling resistor R6, a fifth sampling resistor R7, a sixth capacitor C6, and a seventh capacitor C7. The anode of the first diode D3 serves as the sampling terminal, used to connect to the secondary side of transformer T1. Specifically, in Figure 9 In the circuit, the anode of the first diode D3 is connected to the third node P3, and then connected to the secondary side of the transformer T1 through the first inductor L1 in the matching unit. The cathode of the first diode D3 is connected to the first end of the fourth sampling resistor R6. The second end of the fourth sampling resistor R6 and the first end of the fifth sampling resistor R7 are connected to the first end of the sixth capacitor C6. The second end of the fifth sampling resistor R7 is connected to the first end of the seventh capacitor C7. The node formed is used to connect the control unit 10. The second ends of the sixth capacitor C6 and the seventh capacitor C7 are grounded together.

[0122] Figure 10 This application illustrates the specific circuit diagrams of the push-pull inverter unit, the first sampling unit, and the second sampling unit in the ultrasonic transducer drive circuit of a beauty device according to an embodiment of this application. Figure 2 As an example, in Figure 10 The second sampling unit includes: a second diode D4, a sixth sampling resistor R8, a seventh sampling resistor R9, an eighth sampling resistor R10, an eighth capacitor C8, and a second operational amplifier U4. The first terminal of the eighth capacitor C8 serves as the sampling terminal, used to connect to the secondary side of transformer T1. The second terminal of the eighth capacitor C8 and the first terminal of the seventh sampling resistor R9 are connected to the anode of the second diode D4. The cathode of the second diode D4 is connected to the positive input terminal of the second operational amplifier U4 through the sixth sampling resistor R8. The second terminal of the seventh sampling resistor R9 is connected to the negative input terminal of the second operational amplifier U4 through the eighth sampling resistor R10. The output terminal of the second operational amplifier U4 is used to connect to the control unit 10.

[0123] The above scheme utilizes a first sampling unit to sample the electrical signal of the primary winding of the transformer, using the sampled information as a basis for determining whether the ultrasonic transducer is operating at its optimal frequency or optimal operating state. And / or utilizes a second sampling unit to sample the electrical signal of the secondary winding of the transformer, or during the ultrasonic energy output process of the ultrasonic transducer, using the sampled information as a basis for determining whether the ultrasonic transducer is operating at its optimal frequency or optimal operating state. Therefore, the control unit can use the first and / or second sampling information as a basis for adjusting the operation of the ultrasonic transducer, providing a foundation for further improving the intelligence level of the beauty device.

[0124] Figure 11 A schematic diagram of the structure of a beauty device provided in an embodiment of this application is shown. Figure 11As shown, the beauty device 200 includes the ultrasonic transducer drive circuit 100 of the beauty device provided in any embodiment of this application.

[0125] Understandably, in Figure 11 In the embodiments shown, due to the improvements and specific implementation methods related to this application, [the following has been implemented]. Figures 1 to 10 The corresponding embodiments are described in detail, so they will not be repeated here.

[0126] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0127] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. An ultrasonic transducer driving circuit of a cosmetic instrument, characterized by, The application relates to a control unit for outputting a drive control signal, a control signal conversion unit connected to the control unit, the control signal conversion unit being configured to output a first frequency signal and a second frequency signal complementary in frequency based on the drive control signal, a push-pull inverter unit connected to the control signal conversion unit and configured to output an alternating current based on the first frequency signal and the second frequency signal, and an ultrasonic transducer unit connected to the push-pull inverter unit and configured to output ultrasonic energy based on the alternating current. The control signal conversion unit comprises a high-frequency signal generation unit configured to generate a high-frequency signal based on the drive control signal, and a logic unit connected to the high-frequency signal generation unit and configured to convert the high-frequency signal into the first frequency signal and the second frequency signal complementary in frequency. The logic unit comprises a first branch and a second branch. An input end of the first branch is connected to an input end of the second branch to form a signal transmission node, and the signal transmission node is configured to be connected to the high-frequency signal generation unit. The first branch is configured to output the first frequency signal based on the high-frequency signal.

2. The ultrasonic transducer drive circuit of claim 1, wherein, The second branch is configured to output the second frequency signal based on the high-frequency signal. The first branch comprises an NAND gate and a first AND gate. An input end of the NAND gate is connected to the signal transmission node, an output end of the NAND gate is connected to an input end of the first AND gate, and an output end of the first AND gate is configured to output the first frequency signal.

3. The ultrasonic transducer drive circuit of claim 2, wherein, The second branch comprises a second AND gate and a third AND gate. An input end of the second AND gate is connected to the signal transmission node, an output end of the second AND gate is connected to an input end of the third AND gate, and an output end of the third AND gate is configured to output the second frequency signal. The first branch further comprises a first dead zone setting circuit connected between the NAND gate and the first AND gate. The second branch further comprises a second dead zone setting circuit connected between the second AND gate and the third AND gate.

4. The ultrasonic transducer drive circuit of claim 3, wherein, The push-pull inverter unit comprises a drive unit connected to the control signal conversion unit and configured to output a first drive signal and a second drive signal complementary in frequency based on the first frequency signal and the second frequency signal, and a push-pull inverter circuit connected to the drive unit and configured to output the alternating current based on the first drive signal and the second drive signal. The drive unit is configured with a first input end, a second input end, a first output end and a second output end, the first input end and the second input end are respectively connected to the control signal conversion unit, and the first output end and the second output end are respectively connected to the push-pull inverter circuit. ​ ​ 5. The ultrasonic transducer drive circuit of claim 4, wherein, ​ ​ ​ ​ ​ 6. The ultrasonic transducer drive circuit of claim 1, wherein, ​ ​ ​ 7. The ultrasonic transducer drive circuit of claim 6, wherein, ​ The push-pull inverter circuit is configured with a first controlled end, a second controlled end, a first output end and a second output end, the first controlled end is connected with the first output end of the driving unit, the second controlled end is connected with the second output end of the driving unit, and the first output end and the second output end are connected with the ultrasonic transducing unit.

8. The ultrasonic transducer drive circuit of claim 7, wherein, The push-pull inverter circuit comprises a first driving branch, a second driving branch and a transformer. The input end of the first driving branch is the first controlled end, the output end of the first driving branch is connected with the first primary end of the transformer, the input end of the second driving branch is the second controlled end, the output end of the second driving branch is connected with the second primary end of the transformer, the first secondary end of the transformer is the first output end, and the second secondary end of the transformer is the second output end.

9. The ultrasonic transducer drive circuit of claim 8, wherein, The first driving branch comprises a first switch tube, a first capacitor and a first resistor. The controlled end of the first switch tube is the input end of the first driving branch, the high potential end of the first switch tube is connected with the first capacitor to form a first node, the first node is the output end of the first driving branch, the second end of the first capacitor is connected with the first end of the first resistor, and the second end of the first resistor is connected with the low potential end of the first switch tube and grounded. And / or The second driving branch comprises a second switch tube, a second capacitor and a second resistor. The controlled end of the second switch tube is the input end of the second driving branch, the high potential end of the second switch tube is connected with the second capacitor to form a second node, the second node is the output end of the second driving branch, the second end of the second capacitor is connected with the first end of the second resistor, and the second end of the second resistor is connected with the low potential end of the second switch tube and grounded.

10. The ultrasonic transducer drive circuit of claim 8, wherein, The driving unit further comprises a power supply unit connected with the primary side of the transformer for supplying power to the transformer.

11. The ultrasonic transducer drive circuit of claim 10, wherein, The power supply unit comprises a voltage regulating branch for regulating the supply voltage. And / or The ultrasonic transducing driving circuit further comprises a first sampling unit connected between the power supply unit and the primary side of the transformer.

12. The ultrasonic transducer drive circuit of claim 11, wherein, Further comprising: an operational amplifier unit, a filter unit and a protection unit; the input end of the operational amplifier unit is connected with the output end of the first sampling unit, and the output end of the operational amplifier unit is connected with the control unit; the first end of the filter unit is connected with the output end of the operational amplifier unit, the second end of the filter unit is connected with the control unit and the protection unit, and the protection unit is used for limiting the size of the electric signal output by the operational amplifier unit to the control unit through the filter unit.

13. The ultrasonic transducer drive circuit of claim 12, wherein, The first sampling unit comprises a first sampling resistor, a second sampling resistor, a third sampling resistor and a fifth capacitor; a first end of the first sampling resistor is connected with a first end of the third sampling resistor to form a first sampling node for connecting a center tap of a primary side of the transformer; a second end of the first sampling resistor is connected with a first end of the second sampling resistor; a second end of the second sampling resistor is connected with a first end of the fifth capacitor; and a second end of the third sampling resistor is connected with a second end of the fifth capacitor to the operational amplifier unit; and / or, The operational amplifier unit comprises a first operational amplifier; a negative input end of the first operational amplifier is connected with the second end of the fifth capacitor; and a positive input end of the first operational amplifier is connected with the first end of the fifth capacitor; and an output end of the first operational amplifier is used as an output end of the operational amplifier unit; and / or, The filter unit comprises a filter resistor and a filter capacitor; a first end of the filter resistor is used as a first end of the filter unit; a second end of the filter resistor is connected with a first end of the filter capacitor to form a node which is used as a second end of the filter unit; and a second end of the filter capacitor is grounded; and / or, The protection unit comprises a voltage stabilizing tube connected between the second end of the filter unit and the ground.

14. An ultrasonic transducer drive circuit as claimed in any one of claims 6 to 11, wherein, Further comprising: a second sampling unit connected with a secondary side of the transformer in the push-pull inverter circuit.

15. The ultrasonic transducer drive circuit of claim 8, wherein, The ultrasonic transducing unit comprises a matching unit and an ultrasonic transducer; The matching unit is coupled between the secondary side of the transformer and the ultrasonic transducer; and the ultrasonic transducer is used to output ultrasonic energy according to the alternating current.

16. The ultrasonic transducer drive circuit of claim 15, wherein, Further comprising: A third sampling unit connecting the matching unit and the control unit is used to sample an electrical signal output by the matching unit to obtain sampling information and feed back to the control unit.

17. The ultrasonic transducer drive circuit of claim 16, wherein, One end of the third sampling unit connected with the matching unit is a signal sampling end; one end of the third sampling unit connected with the control unit is a signal feedback end; and the third sampling unit comprises a sampling subunit, a detection subunit, a first filtering subunit and an amplifying subunit; the signal sampling end is grounded through the sampling subunit; an input end of the detection subunit is connected with the signal sampling end; an output end of the detection subunit is connected with an input end of the amplifying subunit through the first filtering subunit; and an output end of the amplifying subunit is connected with the signal feedback end.

18. The ultrasonic transducer drive circuit of claim 17, wherein, The sampling subunit comprises a sampling resistor connected between the signal sampling end and the ground; The detection subunit comprises a detection capacitor, a detection resistor and a third diode; a first end of the detection capacitor is an input end of the detection subunit; a second end of the detection capacitor is connected with an anode of the third diode; the anode of the third diode is grounded through the detection resistor; and a cathode of the third diode is an output end of the detection subunit; The first filtering subunit comprises a first filtering capacitor, a second filtering capacitor, a first filtering resistor and a second filtering resistor, a first end of the first filtering capacitor is connected to an output end of the detecting subunit, a second end of the first filtering capacitor is grounded, the first filtering resistor is connected in parallel with the first filtering capacitor, a first end of the second filtering resistor is connected to the first end of the first filtering capacitor, a second end of the second filtering resistor is connected to an input end of the amplifying subunit, a first end of the second filtering capacitor is connected to the second end of the second filtering resistor, and another end of the second filtering capacitor is grounded. The amplifying subunit comprises a third operational amplifier, a first reference resistor and a second reference resistor, a positive input pin of the third operational amplifier is the input end of the amplifying subunit, a negative input pin of the third operational amplifier is grounded through the first reference resistor, an output pin of the third operational amplifier is connected to the negative input pin of the third operational amplifier through the second reference resistor, and the output pin of the third operational amplifier is the output end of the amplifying subunit.

19. The ultrasonic transducer drive circuit of claim 17, wherein, The third sampling unit further comprises a second filtering subunit and a limiting subunit, the output end of the amplifying subunit is connected to the signal feedback end through the second filtering subunit, and the limiting subunit is connected to the signal feedback end and used for limiting the size of an electrical signal output by the signal feedback end to the control unit.

20. The ultrasonic transducer drive circuit of claim 19, wherein, The second filtering subunit comprises a first output resistor and a first output capacitor, a first end of the first output resistor is connected to the output end of the amplifying subunit, a second end of the first output resistor is connected to the signal feedback end and grounded through the first output capacitor; and the limiting subunit comprises a stabilizing tube, which is connected between the signal feedback end and the ground.

21. The ultrasonic transducer drive circuit of claim 15, wherein, The matching unit comprises a first inductor and a third capacitor; a first end of the first inductor is used as a first end of the matching unit and is connected to a first secondary side end of the transformer, a second end of the first inductor is connected to a first end of the third capacitor to form a third node, and a second end of the third capacitor is used as a second end of the matching unit and is connected to a second secondary side end of the transformer to form a fourth node; a first end of the ultrasonic transducer is connected to the third node, and a second end of the ultrasonic transducer is connected to the fourth node.

22. A cosmetic device, characterized by An ultrasonic transducer driving circuit comprising the cosmetic instrument of any one of claims 1 to 21. An ultrasonic transducer driving circuit comprising the cosmetic instrument of any one of claims 1 to 21.

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