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, an ultrasonic transduction unit and a current detection unit. Wherein the control unit is electrically connected with the control signal conversion unit, and the control signal conversion unit is electrically 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 current detection unit is electrically connected with the ultrasonic transduction unit and the control unit, and the control unit monitors the working state of the ultrasonic transduction unit through the current detection unit. According to the scheme, electronic devices are reduced, complex control logic is not needed, and the implementation cost is lower; moreover, the service life of the super energy transduction unit is prolonged, and the service life of the beauty instrument is prolonged.

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 is typically used to output AC power to power the 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 these four transistors to output AC power, and its control scheme is complex and hardware costs are high, the overall cost of the beauty device is relatively high. Furthermore, existing beauty devices cannot promptly detect and intervene when abnormalities occur in the ultrasonic transducer, resulting in a shorter lifespan for the ultrasonic transducer and consequently affecting the lifespan of the beauty device. 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, and can promptly detect abnormalities that occur during the operation of the ultrasonic transducer for adjustment, thereby extending the life of the ultrasonic transducer.

[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] The control signal conversion unit is electrically 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 electrically 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 electrically connected to the push-pull inverter unit. The ultrasonic transducer unit is used to operate based on the AC power output from the push-pull inverter unit and output ultrasonic energy.

[0010] A current detection unit is electrically connected to the ultrasonic transducer and the control unit. The control unit monitors the working status of the ultrasonic transducer through the current detection unit.

[0011] Optionally, the control signal conversion unit includes:

[0012] A high-frequency signal generation unit is used to generate a high-frequency signal according to the drive control signal;

[0013] The logic unit is electrically connected to the high-frequency signal generation unit and is used to convert the high-frequency signal into a first frequency signal and a second frequency signal that are complementary in frequency.

[0014] Optionally, the logic unit includes a first branch and a second branch;

[0015] The input terminal of the first branch is connected to the input terminal of the second branch to form a signal transmission node, which is used to electrically connect the high-frequency signal generation unit.

[0016] The first branch is used to output a first frequency signal based on the high-frequency signal;

[0017] The second branch is used to output a second frequency signal based on the high-frequency signal.

[0018] Optionally, the first branch includes: a NAND gate and a first AND gate;

[0019] The input terminal of the NAND gate is electrically connected to the signal transmission node, and the output terminal of the NAND gate is electrically connected to the input terminal of the first AND gate. The output terminal of the first AND gate is used to output the first frequency signal; and / or

[0020] The second branch includes: a second AND gate and a third AND gate;

[0021] The input terminal of the second AND gate is electrically connected to the signal transmission node, and the output terminal of the second AND gate is electrically connected to the input terminal of the third AND gate. The output terminal of the third AND gate is used to output the second frequency signal.

[0022] Optionally, the first branch further includes:

[0023] The first dead zone setting circuit is electrically connected between the NAND gate and the first AND gate;

[0024] and / or

[0025] The second branch also includes:

[0026] The second dead zone setting circuit is electrically connected between the second AND gate and the third AND gate.

[0027] Optionally, the push-pull inverter unit includes:

[0028] The driving unit is electrically connected to the control signal conversion unit. The driving unit is used to output a first driving signal and a second driving signal according to the first frequency signal and the second frequency signal, wherein the first driving signal and the second driving signal have complementary frequencies.

[0029] A push-pull inverter circuit is electrically connected to the drive unit. The push-pull inverter circuit is used to output the alternating current according to the first drive signal and the second drive signal.

[0030] Optionally, the drive unit is configured with a first input terminal, a second input terminal, a first output terminal, and a second output terminal. The first input terminal and the second input terminal are respectively electrically connected to the control signal conversion unit, and the first output terminal and the second output terminal are respectively electrically connected to the push-pull inverter circuit.

[0031] The push-pull inverter circuit is configured with a first controlled terminal, a second controlled terminal, a first output terminal, and a second output terminal. The first controlled terminal is electrically connected to the first output terminal of the drive unit, and the second controlled terminal is electrically connected to the second output terminal of the drive unit. The first output terminal and the second output terminal are both electrically connected to the ultrasonic transducer unit.

[0032] Optionally, the push-pull inverter circuit includes: a first drive branch, a second drive branch, and a transformer;

[0033] The input terminal of the first drive branch serves as the first controlled terminal, and the output terminal of the first drive branch is electrically connected to the first primary terminal of the transformer. The input terminal of the second drive branch serves as the second controlled terminal, and the output terminal of the second drive branch is electrically connected to the second primary terminal of the transformer. The first secondary terminal of the transformer serves as the first output terminal, and the second secondary terminal of the transformer serves as the second output terminal.

[0034] Optionally, the first driving branch includes: a first switching transistor, a first capacitor, and a first resistor;

[0035] The controlled terminal of the first switch is used as the input terminal of the first drive branch. The high potential terminal of the first switch is electrically connected to the first capacitor to form a first node. The first node is used as the output terminal of the first drive branch. The second terminal of the first capacitor is electrically connected to the first terminal of the first resistor. The second terminal of the first resistor and the low potential terminal of the first switch are grounded together.

[0036] and / or

[0037] The second drive branch includes: a second switch, a second capacitor, and a second resistor;

[0038] The controlled terminal of the second switch is used as the input terminal of the second drive branch. The high potential terminal of the second switch is electrically connected to the second capacitor to form a second node. The second node is used as the output terminal of the second drive branch. The second terminal of the second capacitor is electrically connected to the first terminal of the second resistor. The second terminal of the second resistor and the low potential terminal of the second switch are grounded together.

[0039] Optionally, the drive unit further includes a power supply unit, which is electrically connected to the primary side of the transformer and is used to supply power to the transformer.

[0040] Optionally, the power supply unit includes: a voltage regulating branch for regulating the power supply voltage;

[0041] And / or,

[0042] The ultrasonic transducer drive circuit also includes: a first sampling unit, electrically connected between the power supply unit and the primary side of the transformer.

[0043] Optionally, it also includes:

[0044] The second sampling unit is electrically connected to the secondary side of the transformer.

[0045] Optionally, the ultrasonic transducer unit includes: a matching unit and an ultrasonic transducer;

[0046] The matching unit is coupled between the secondary side of the transformer and the ultrasonic transducer, which operates according to the alternating current and outputs ultrasonic energy.

[0047] Optionally, the matching unit includes: a first inductor and a third capacitor;

[0048] The first end of the first inductor serves as the first end of the matching unit and is electrically connected to the first secondary end of the transformer. The second end of the first inductor is electrically connected to the first end of the third capacitor to form a third node. The second end of the third capacitor serves as the second end of the matching unit and is electrically connected to the second secondary end of the transformer to form a fourth node.

[0049] The first end of the ultrasonic transducer is connected to the third node, and the second end of the ultrasonic transducer is connected to the fourth node.

[0050] The current detection unit is electrically connected to the second end of the ultrasonic transducer.

[0051] Optionally, the end of the current detection unit connected to the ultrasonic transducer is a signal sampling end, and the end of the current detection unit connected to the control unit is a signal feedback end. The current detection unit includes a sampling subunit, a detection subunit, a first filtering subunit, and an amplification subunit. The signal sampling end is grounded through the sampling subunit, the input end of the detection subunit is connected to the signal sampling end, the output end of the detection subunit is connected to the input end of the amplification subunit through the first filtering subunit, and the output end of the amplification subunit is connected to the signal feedback end.

[0052] Optionally, the sampling subunit includes a third resistor, which is connected between the signal sampling terminal and ground;

[0053] The detector subunit includes a ninth capacitor, a fourth resistor, and a third diode. The first terminal of the ninth capacitor is the input terminal of the detector subunit, the second terminal of the ninth capacitor is connected to the anode of the third diode, the anode of the third diode is grounded through the fourth resistor, and the cathode of the third diode is the output terminal of the detector subunit.

[0054] The first filter subunit includes a tenth capacitor, an eleventh capacitor, a fifth resistor, and a sixth resistor. The first terminal of the tenth capacitor is connected to the output terminal of the detector subunit, and the second terminal of the tenth capacitor is grounded. The fifth resistor is connected in parallel with the tenth capacitor. The first terminal of the sixth resistor is connected to the first terminal of the tenth capacitor, and the second terminal of the sixth resistor is connected to the input terminal of the amplification subunit. The first terminal of the eleventh capacitor is connected to the second terminal of the sixth resistor, and the other terminal of the eleventh capacitor is grounded.

[0055] The amplification subunit includes a third operational amplifier, a seventh resistor, and an eighth resistor. The positive input pin of the third operational amplifier is the input terminal of the amplification subunit. The negative input pin of the third operational amplifier is grounded through the seventh resistor. The output pin of the third operational amplifier is connected to the negative input pin of the third operational amplifier through the eighth resistor. The output pin of the third operational amplifier is the output terminal of the amplification subunit.

[0056] Optionally, the current detection unit further includes a second filtering subunit and a limiting subunit. The output terminal of the amplification subunit is connected to the signal feedback terminal via the second filtering subunit, and the limiting subunit is connected to the signal feedback terminal to limit the magnitude of the electrical signal output by the signal feedback terminal to the control unit.

[0057] Optionally, the second filtering subunit includes a ninth resistor and a twelfth capacitor. The first end of the ninth resistor is connected to the output terminal of the amplification subunit, and the second end of the ninth resistor is connected to the signal feedback terminal and grounded through the twelfth capacitor. The limiting subunit includes a Zener diode, which is connected between the signal feedback terminal and ground.

[0058] 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.

[0059] 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 instrument includes: a control unit, a control signal conversion unit, a push-pull inverter unit, an ultrasonic transducer unit, and a current detection unit. The control unit is electrically connected to the control signal conversion unit, and the control signal conversion unit is electrically 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 electrically 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. The current detection unit is electrically connected to the ultrasonic transducer unit and the control unit, and the control unit monitors the operating status of the ultrasonic transducer unit through the current detection unit. In the above scheme, 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. Driven by the first and second frequency signals, the push-pull inverter unit generates alternating current to power the ultrasonic transducer unit, which then outputs ultrasonic energy that can penetrate deep into the skin. Compared to a full-bridge inverter unit, this reduces the number of electronic components, resulting in a simpler circuit structure and scale. It also eliminates the need for complex control logic, allowing the beauty device to output ultrasonic energy at a lower cost. Furthermore, the control unit can monitor changes in the operating current of the ultrasonic transducer unit via a current detection unit to determine its operating status. If an abnormality occurs during operation, the control unit can detect it promptly and intervene accordingly to eliminate the abnormality. Alternatively, the control unit can shut down the beauty device to prevent the ultrasonic transducer unit from continuing to operate abnormally. Therefore, this effectively prevents the ultrasonic transducer unit from operating abnormally for extended periods, extending its lifespan and thus improving the overall lifespan of the beauty device. Attached Figure Description

[0060] Figure 1 A schematic diagram of the ultrasonic transducer drive circuit of a beauty device provided in this application embodiment;

[0061] 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 ;

[0062] 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 ;

[0063] 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 ;

[0064] 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 ;

[0065] 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;

[0066] 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;

[0067] 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;

[0068] 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 ;

[0069] 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 ;

[0070] Figure 11 A schematic diagram of the ultrasonic transducer drive circuit of a beauty device provided in this application embodiment;

[0071] Figure 12 for Figure 11 A circuit diagram of one embodiment of the current detection unit in the embodiments;

[0072] Figure 13 A schematic diagram of the ultrasonic transducer drive circuit of a beauty device provided in this application embodiment;

[0073] Figure 14 for Figure 13 A circuit diagram of one embodiment of the current detection unit in the embodiments;

[0074] Figure 15 This is a schematic diagram of the structure of a beauty device provided in an embodiment of this application. Detailed Implementation

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] However, in related beauty device solutions, a full-bridge inverter unit is used to output AC power to power the 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 hardware costs are high, the overall cost of the beauty device is relatively high. Furthermore, the ultrasonic transducer may experience abnormalities during operation (such as excessive or insufficient current). Prolonged abnormal operation of the ultrasonic transducer can easily affect its lifespan. Current beauty devices cannot promptly detect and intervene when abnormalities occur in the ultrasonic transducer, resulting in a shorter transducer lifespan and consequently, a shorter lifespan for the beauty device.

[0081] 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, an ultrasonic transducer unit, and a current detection unit. The control unit is electrically connected to the control signal conversion unit, and the control signal conversion unit is electrically 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 electrically 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. The current detection unit is electrically connected to the ultrasonic transducer unit and the control unit. The current detection unit can detect the operating current of the ultrasonic transducer unit, and the control unit monitors the operating status of the ultrasonic transducer unit through the current detection unit.

[0082] 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. The above solution also detects the operating current of the ultrasonic transducer unit through a current detection unit. The control unit can then monitor changes in the operating current of the ultrasonic transducer unit to determine its operating status. If an abnormality occurs during the operation of the ultrasonic transducer unit, the control unit can detect it promptly by monitoring the abnormal operating current. The control unit can then make corresponding adjustments to eliminate the abnormality, or it can shut down the beauty device to prevent the ultrasonic transducer unit from continuing to operate abnormally. Therefore, this effectively prevents the ultrasonic transducer unit from being in an abnormal operating state for extended periods, prolonging its lifespan and thus improving the overall lifespan of the beauty device.

[0083] In addition, the current detection unit can also detect the operating current of the ultrasonic transducer unit during the process of the beauty instrument searching for the optimal drive control signal that makes the ultrasonic transducer unit operate at the optimal frequency (i.e., the ultrasonic transducer in the ultrasonic transducer unit resonate). Specifically, the control unit outputs different drive control signals in sequence, causing the control signal conversion unit to output corresponding first and second frequency signals in sequence according to the different drive control signals. This causes the push-pull inverter unit to output alternating current of different frequencies in sequence, driving the ultrasonic transducer unit to work. The control unit detects the operating current of the ultrasonic transducer unit under the drive of alternating current of different frequencies in sequence through the current detection unit, thereby determining the frequency of the alternating current that maximizes the operating current of the ultrasonic transducer unit (i.e., the optimal drive frequency). The drive control signal corresponding to this optimal drive frequency is the optimal drive control signal.

[0084] 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 of the beauty device handle's communication electrical connection. 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.

[0085] See Figure 1 , Figure 1A 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:

[0086] exist Figure 1 In 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:

[0087] Control unit 10 is used to output drive control signals. Control signal conversion unit 20 is electrically connected to control unit 10. Control signal conversion unit 20 is used to output a first frequency signal and a second frequency signal with complementary frequencies based on the drive control signals. Push-pull inverter unit 30 is electrically connected to control signal conversion unit 20. Push-pull inverter unit 30 is used to output alternating current according to the first frequency signal and the second frequency signal. Ultrasonic transducer unit 40 is electrically connected to push-pull inverter unit 30. Ultrasonic transducer unit 40 is used to operate according to alternating current and output ultrasonic energy.

[0088] In this embodiment, since the control unit 10 is electrically 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.

[0089] 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.

[0090] 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 electrically 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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:

[0095] The high-frequency signal generation unit 21 is used to generate a high-frequency signal based on the drive control signal. The logic unit 22, electrically connected to the high-frequency signal generation unit, is used to convert the high-frequency signal into a first frequency signal and a second frequency signal with complementary frequencies.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] like 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 electrically 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.

[0102] 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 electrically 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.

[0103] 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.

[0104] 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 1 As one embodiment, the first branch 221 includes: a NAND gate and a first AND gate AND1. Specifically:

[0105] The input of the NAND gate is electrically connected to the signal transmission node P, and the output of the NAND gate is electrically 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 electrically connected to the signal transmission node P, and the output of the second AND gate AND2 is electrically 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.

[0106] In this embodiment, the input of the NAND gate is electrically connected to the signal transmission node P, which can output the high-frequency signal in reverse. The input of the second AND gate AND2 is electrically connected to the signal transmission node P, which can output the high-frequency signal in forward direction.

[0107] 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 electrically connected to the signal transmission node P.

[0108] 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.

[0109] Combination Figure 3 and Figure 5 As one embodiment, the first branch 221 further includes a first dead-time setting circuit 23, electrically connected between the NAND gate and the first AND gate AND1. The second branch 222 further includes a second dead-time setting circuit 24, electrically connected between the second AND gate AND2 and the third AND gate AND3.

[0110] 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.

[0111] 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.

[0112] 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 electrically connected to the control unit via I2C electrical connection terminals (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.

[0113] 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.

[0114] 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 one embodiment, the push-pull inverter unit 30 includes: a drive unit 31 and a push-pull inverter circuit 32. Specifically:

[0115] The drive unit 31 is electrically connected to the control signal conversion unit 20. The drive unit 31 outputs 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 electrically connected to the drive unit 31. The push-pull inverter circuit 32 outputs alternating current based on the first drive signal and the second drive signal.

[0116] Combination Figure 3 and Figure 7 As an 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 electrically connected to the control signal conversion unit 20, and the first output terminal OUT1 and the second output terminal OUT2 are electrically 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 electrically connected to the first output terminal OUT1 of the drive unit 31, and the second controlled terminal is electrically 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 electrically connected to the ultrasonic transducer unit 40.

[0117] 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 electrically 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 electrically 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.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] 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.

[0122] As one embodiment, the drive unit 31 further includes a power supply unit (not shown in the figure). Here, the power supply unit is electrically connected to the primary side of the transformer and is used to supply power to the transformer T1.

[0123] 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.

[0124] As one possible implementation, the power supply unit includes a voltage regulating branch for regulating the supply voltage.

[0125] 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.

[0126] As one embodiment, the ultrasonic transducer drive circuit provided in this embodiment further includes: a first sampling unit, electrically connected between the power supply unit and the primary side of the transformer.

[0127] 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.

[0128] In a specific implementation, the first sampling unit can be electrically connected to the primary side of transformer T1, specifically, it can be electrically connected to the midpoint of the primary side of transformer T1, thereby enabling current and / or voltage sampling of the primary side of transformer T1.

[0129] As one embodiment, the ultrasonic transducer drive circuit provided in this embodiment further includes: a second sampling unit, which is electrically connected to the secondary side of the transformer.

[0130] Similar to the above embodiments, in actual implementation, the second sampling unit is electrically connected to the secondary side of transformer T1, specifically at the node where the secondary side of the transformer is electrically connected 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.

[0131] In a practical implementation, the second sampling unit may include a current / voltage sampling circuit, which may be electrically connected to the secondary side of the transformer. For example, the second sampling unit may be electrically connected to the secondary side of the transformer via a matching circuit. Alternatively, the second sampling unit may be electrically connected at the electrical connection node between the secondary side of the transformer and the transducer.

[0132] 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.

[0133] 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 8 As 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.

[0134] like Figure 8As 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 electrically 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 electrically 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 electrically 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 electrically 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.

[0135] 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, electrically connecting to the first secondary side of the transformer T1. The second end of the first inductor L1 is electrically 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, electrically connecting to the second secondary side of the 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. In some embodiments, the current detection unit 50 is connected to the second end of the ultrasonic transducer H1, i.e., the lower side of the ultrasonic transducer H1.

[0136] In this embodiment, the first switch is turned on and off regularly according to the first driving signal, and the second switch is turned on and off regularly 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 its optimal frequency / optimal operating state. Furthermore, the current detection unit 50 is connected to the second terminal of the ultrasonic transducer H1, i.e., the low side of the ultrasonic transducer H1, and samples the current on the low side of the ultrasonic transducer H1. Since the voltage on the low side of the ultrasonic transducer H1 is low, the circuit configuration of the current detection unit 50 can be simplified and the cost reduced.

[0137] 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.

[0138] exist Figure 9 In this circuit, the power supply unit may include a preset power supply VDD. Here, the power supply VDD is electrically connected to the first terminal of the fourth capacitor C4, forming a fifth node P5. The first terminal of the second inductor L2 is electrically connected to the fifth node P5, and the second terminal of the second inductor L2 is electrically connected to the center connection of the transformer T1. Here, the fifth node P5 can be considered a feed point. In a specific implementation, the first sampling unit can be electrically connected to this fifth node P5 to sample the electrical signal from the primary side of the transformer T1.

[0139] As one possible implementation, the voltage terminal V_OUT of the driver chip U2 can be electrically 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 electrically connected to the fifth node P5, thereby obtaining the voltage and / or current of the primary side of transformer T1.

[0140] 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 electrically connect to the fifth node P5, or to electrically connect to the center tap of the primary side of transformer T1. The second end of the first sampling resistor R3 is electrically connected to the first end of the second sampling resistor R4, and the second end of the second sampling resistor R4 is electrically 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 electrically connected to the first end of the fifth capacitor C5. The output terminal OUT of the first operational amplifier U3 is electrically connected to the first end of the output resistor Rout, and the second end of the output resistor Rout is used to electrically connect to the control unit 10.

[0141] 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 electrically connect to the secondary side of the transformer T1.

[0142] Specifically, in Figure 9 In the circuit, the anode of the first diode D3 is electrically connected to the third node P3, and then electrically 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 electrically connected to the first terminal of the fourth sampling resistor R6. The second terminal of the fourth sampling resistor R6 and the first terminal of the fifth sampling resistor R7 are connected to the first terminal of the sixth capacitor C6. The second terminal of the fifth sampling resistor R7 and the first terminal of the seventh capacitor C7 are electrically connected, forming a node for electrically connecting the control unit 10. The second terminals of the sixth capacitor C6 and the seventh capacitor C7 are grounded together.

[0143] 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, electrically connected 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 electrically 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 electrically 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 electrically connected to the control unit 10.

[0144] 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.

[0145] like Figure 11As shown, in this embodiment, the end of the current detection unit 50 connected to the ultrasonic transducer unit is the signal sampling terminal B1, and the end of the current detection unit 50 connected to the control unit 10 is the signal feedback terminal B2. The current detection unit 50 includes a sampling subunit 501, a detection subunit 502, a first filtering subunit 503, and an amplification subunit 504. The signal sampling terminal B1 is grounded via the sampling subunit 501. The input terminal of the detection subunit 502 is connected to the signal sampling terminal B1. The output terminal of the detection subunit 502 is connected to the input terminal of the amplification subunit 504 via the first filtering subunit 503. The output terminal of the amplification subunit 504 is connected to the signal feedback terminal B2.

[0146] The working principle of the current detection unit 50 in this embodiment is as follows: the sampling subunit 501 samples the electrical signal (i.e., the working current of the ultrasonic transducer 40) from the ultrasonic transducer unit 40. The detection subunit 502 detects the electrical signal sampled by the sampling subunit 501, 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 502 is filtered by the first filtering subunit 503 to remove high-frequency noise and interference signals from the DC signal. Then, it is output to the amplification subunit 504. The amplification subunit 504 amplifies the received electrical signal by a preset factor and outputs the amplified electrical signal (voltage signal) from the signal feedback terminal B2 to the control unit 10. The control unit 10 determines the working current of the ultrasonic transducer 40 based on the electrical signal at the signal feedback terminal B2. In this way, the control unit 10 can determine the change in the working current of the ultrasonic transducer 40 in real time through the current detection unit 50, thus realizing the monitoring of the working status of the ultrasonic transducer 40. When the control unit 10 outputs different drive control signals in sequence, causing the push-pull inverter unit 30 to output AC power of different frequencies in sequence, the sampling subunit 501 of the current detection unit 50 samples different electrical signals from the ultrasonic transducer unit 40. After being processed by the detection subunit 502, filtered by the first filtering subunit 503, and amplified by the amplification subunit 504, the signals are output from the signal feedback terminal B2 to the control unit 10. Thus, the control unit 10 receives different sampling information. Different sampling information corresponds to different operating currents of the ultrasonic transducer unit 40, which represents different ultrasonic energy intensities of the ultrasonic transducer unit 40. The larger the sampling information received by the control unit 10, the larger the operating current of the ultrasonic transducer unit 40. By comparing several sets of received sampling information, the control unit 10 can determine the initial control signal that maximizes the ultrasonic energy intensity of the ultrasonic transducer unit 40, which is the optimal control signal. Furthermore, the control unit 10 can output the optimal control signal to control the push-pull inverter unit 30 to output the target AC power that is most compatible with the ultrasonic transducer unit 40, so that the ultrasonic transducer unit 40 works at the optimal frequency point. In this way, the energy conversion efficiency of the ultrasonic transducer unit 40 is improved, and the service life of the ultrasonic transducer unit 40 is guaranteed or increased.

[0147] like Figure 12 As shown, Figure 12 for Figure 11 A circuit diagram of one embodiment of the current detection unit 50. In this embodiment, the sampling subunit 501 includes a third resistor R01, which is connected between the signal sampling terminal B1 and ground;

[0148] The detector subunit 502 includes a ninth capacitor C9, a fourth resistor R02, and a third diode D5. The first terminal of the ninth capacitor C9 is the input terminal of the detector subunit 502, the second terminal of the ninth capacitor C9 is connected to the anode of the third diode D5, the anode of the third diode D5 is grounded through the fourth resistor R02, and the cathode of the third diode D5 is the output terminal of the detector subunit 502.

[0149] The first filter subunit 503 includes a tenth capacitor C10, an eleventh capacitor C11, a fifth resistor R03, and a sixth resistor R04. The first end of the tenth capacitor C10 is connected to the output end of the detector subunit 502, and the second end of the tenth capacitor C10 is grounded. The fifth resistor R03 is connected in parallel with the tenth capacitor C10. The first end of the sixth resistor R04 is connected to the first end of the tenth capacitor C10, and the second end of the sixth resistor R04 is connected to the input end of the amplifier subunit 504. The first end of the eleventh capacitor C11 is connected to the second end of the sixth resistor R04, and the other end of the eleventh capacitor C11 is grounded.

[0150] The amplification subunit 504 includes a third operational amplifier U5, a seventh resistor R05, and an eighth resistor R06. The positive input pin of the third operational amplifier U5 is the input terminal of the amplification subunit 504, the negative input pin of the third operational amplifier U5 is grounded through the seventh resistor R05, the output pin of the third operational amplifier U5 is connected to the negative input pin of the third operational amplifier U5 through the eighth resistor R06, and the output pin of the third operational amplifier U5 is the output terminal of the amplification subunit 504. The power supply pin of the third operational amplifier U5 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 U5.

[0151] The circuit working principle of the current detection unit 50 in this embodiment is as follows: the signal sampling terminal B1 is grounded through the third resistor R01, and the current in the circuit loop of the ultrasonic transducer unit 40 (i.e., the operating current of the ultrasonic transducer unit 40) is sampled through the third resistor R01; the input terminal of the detector subunit 502 receives the sampling signal (voltage signal across the third resistor R01) from the signal sampling terminal B1. After the sampling signal is AC coupled by the ninth capacitor C9 and the fourth resistor R02, it is rectified by the third diode D5 (i.e., the detector diode) to obtain a DC signal. The DC signal output by the detector subunit 502 is subjected to high-frequency filtering processing by the filter circuit composed of the tenth capacitor C10, the fifth resistor R03, the sixth resistor R04 and the eleventh capacitor C11 to filter out the third resistor R01. The high-frequency noise during rectification by diode D5 is eliminated to obtain a clean DC signal, which is then output to the positive input pin of the third operational amplifier U5. The third operational amplifier U5 amplifies the DC signal by a preset factor (where the amplification factor of the third operational amplifier U5 is determined by the resistance ratio of the seventh resistor R05 and the eighth resistor R06. Since the resistance of the third resistor R01 is usually very small, the voltage signal across the third resistor R01 will be very small, and the DC signal obtained after filtering is also very small, such as tens of millivolts. Therefore, it is necessary to use the third operational amplifier U5 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 drive control signal.

[0152] After receiving the sampling information, the control unit 10 calculates the operating current of the ultrasonic transducer 40 corresponding to the sampling information based on the resistance value of the third resistor R01 and the amplification factor of the third operational amplifier U5. Thus, by sequentially outputting N sets of drive control signals (N is an integer greater than 2), the control unit 10 can sequentially obtain the operating current of the ultrasonic transducer 40 corresponding to each of the N sets of drive control signals. The magnitude of the operating current of the ultrasonic transducer 40 directly reflects the ultrasonic energy intensity of the ultrasonic transducer 40. The larger the operating current, the greater the ultrasonic energy intensity of the ultrasonic transducer 40. Therefore, the control unit 10 can use the set of drive control signals that achieves the maximum operating current of the ultrasonic transducer 40 as the optimal control signal to drive the ultrasonic transducer 40 to work, thereby improving the energy conversion efficiency of the ultrasonic transducer 40 and ensuring or increasing the service life of the ultrasonic transducer 40.

[0153] Of course, in other embodiments, the sampling subunit 501, the detection subunit 502, the first filtering subunit 503 and the amplification subunit 504 can all be circuits that achieve the same function, composed of other components and other connection methods.

[0154] like Figure 13As shown, the current detection unit 50 in this embodiment is... Figure 12 or Figure 13 Based on the circuit structure of the embodiment shown, the current detection unit 50 further includes a second filtering subunit 505 and a limiting subunit 506. The output terminal of the amplification subunit 504 is connected to the signal feedback terminal B2 via the second filtering subunit 505. The limiting subunit 506 is connected to the signal feedback terminal B2 and is used to limit the magnitude of the electrical signal output from the signal feedback terminal B2 to the control unit 10.

[0155] In this embodiment, considering that the electrical signal output from the amplification subunit 504 may be affected by some high-frequency noise and interference signals, a second filtering subunit 505 is added between the output of the amplification subunit 504 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 current detection unit 50. This filtering subunit 505 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 506 is connected to the signal feedback terminal B2. The limiting subunit 506 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.

[0156] like Figure 14 As shown, Figure 14 for Figure 13 A circuit diagram of one embodiment of the current detection unit 50. In this embodiment, the second filter subunit 505 includes a ninth resistor R07 and a twelfth capacitor C12. The first end of the ninth resistor R07 is connected to the output terminal of the amplification subunit 504, and the second end of the ninth resistor R07 is connected to the signal feedback terminal B2 and grounded through the twelfth capacitor C12. The twelfth capacitor C12 and the ninth resistor R07 form an RC filter circuit to filter the electrical signal output from the output terminal of the amplification subunit 504 (i.e., the output pin of the third operational amplifier U5), 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 506 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.

[0157] Of course, in some other embodiments, the second filter subunit 505 may also be a filtering circuit composed of other components, and the limiting subunit 506 may also include other devices or circuits with voltage limiting protection.

[0158] The above Figures 11 to 14 In the embodiment, the control unit 10 only needs to obtain the working state of the ultrasonic transducer 40 based on the current signal sampled by the current detection unit 50 from the ultrasonic transducer 40. In this way, the optimal drive control signal can be determined and the working state of the ultrasonic transducer 40 can be monitored. Compared with the detection unit 40 simultaneously collecting the electrical signals of the primary and secondary sides of the transformer T1 of the push-pull inverter unit 30, the scheme of using the current detection unit 50 to directly detect the working current of the ultrasonic transducer 40 makes the overall circuit structure simpler, and the control unit 10 needs to process less sampling information. This simplifies the overall structure of the ultrasonic transducer drive circuit 100 and reduces the computing power requirement of the control unit 10.

[0159] Figure 15 A schematic diagram of the structure of a beauty device provided in an embodiment of this application is shown. Figure 15 As shown, the beauty device 200 includes the ultrasonic transducer drive circuit 100 of the beauty device provided in any embodiment of this application.

[0160] Understandably, in Figure 15 In the embodiments shown, due to the improvements and specific implementation methods related to this application, [the following has been implemented]. Figures 1 to 14 The corresponding embodiments are described in detail, so they will not be repeated here.

[0161] 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.

[0162] 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 an ultrasonic transducer unit and a control method thereof. The application comprises: a control unit for outputting a driving control signal; a control signal conversion unit electrically connected with the control unit, the control signal conversion unit being used for outputting a first frequency signal and a second frequency signal with complementary frequencies based on the driving control signal; a push-pull inverter unit electrically connected with the control signal conversion unit, the push-pull inverter unit being used for outputting alternating current according to the first frequency signal and the second frequency signal; an ultrasonic transducer unit electrically connected with the push-pull inverter unit, the ultrasonic transducer unit being used for outputting ultrasonic energy according to the alternating current output by the push-pull inverter unit; 2. The ultrasonic transducer drive circuit of claim 1, wherein, a current detection unit electrically connected with the ultrasonic transducer unit and the control unit, the control unit monitoring the working state of the ultrasonic transducer unit through the current detection unit.

3. The ultrasonic transducer drive circuit of claim 2, wherein, One end of the current detection unit connected with the ultrasonic transducer unit is a signal sampling end, one end of the current detection unit connected with the control unit is a signal feedback end, and the current detection unit comprises a sampling subunit, a detection subunit, a first filtering subunit and an amplification subunit; the signal sampling end is grounded through the sampling subunit, the input end of the detection subunit is connected with the signal sampling end, the output end of the detection subunit is connected with the input end of the amplification subunit through the first filtering subunit, and the output end of the amplification subunit is connected with the signal feedback end. The sampling subunit comprises a third resistor, and the third resistor is connected between the signal sampling end and the ground; the detection subunit comprises a ninth capacitor, a fourth resistor and a third diode, the first end of the ninth capacitor is the input end of the detection subunit, the second end of the ninth capacitor is connected with the anode of the third diode, the anode of the third diode is grounded through the fourth resistor, and the cathode of the third diode is the output end of the detection subunit; the first filtering subunit comprises a tenth capacitor, an eleventh capacitor, a fifth resistor and a sixth resistor, the first end of the tenth capacitor is connected with the output end of the detection subunit, the second end of the tenth capacitor is grounded, the fifth resistor is connected with the tenth capacitor in parallel, the first end of the sixth resistor is connected with the first end of the tenth capacitor, the second end of the sixth resistor is connected with the input end of the amplification subunit, and the first end of the eleventh capacitor is connected with the second end of the sixth resistor, and the other end of the eleventh capacitor is grounded; 4. The ultrasonic transducer drive circuit of claim 2, wherein, the amplification subunit comprises a third operational amplifier, a seventh resistor and an eighth resistor, the positive input pin of the third operational amplifier is the input end of the amplification subunit, the negative input pin of the third operational amplifier is grounded through the seventh resistor, the output pin of the third operational amplifier is connected with the negative input pin of the third operational amplifier through the eighth resistor, and the output pin of the third operational amplifier is the output end of the amplification subunit. The current detection unit further comprises a second filtering subunit and a limiting subunit, the output end of the amplification subunit is connected with the signal feedback end through the second filtering subunit, and the limiting subunit is connected with the signal feedback end and is used for limiting the size of the electric signal output by the signal feedback end to the control unit.

5. The ultrasonic transducer drive circuit of claim 4, wherein, The second filter subunit comprises a ninth resistor and a twelfth capacitor, a first end of the ninth resistor is connected to an output end of the amplification subunit, a second end of the ninth resistor is connected to the signal feedback end, and the signal feedback end is grounded through the twelfth capacitor; the limiting subunit comprises a stabilizing tube, the stabilizing tube is connected between the signal feedback end and the ground.

6. An ultrasonic transducer drive circuit as claimed in any one of claims 1 to 5, wherein, The control signal conversion unit comprises: a high-frequency signal generation unit configured to generate a high-frequency signal according to the drive control signal; a logic unit comprising 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 electrically connect the high-frequency signal generation unit; the first branch is configured to output a first frequency signal according to the high-frequency signal; the second branch is configured to output a second frequency signal according to the high-frequency signal.

7. An ultrasonic transducer drive circuit as claimed in any one of claims 1 to 5, wherein, The push-pull inverter unit comprises: a drive unit electrically connected to the control signal conversion unit, the drive unit is configured to output a first drive signal and a second drive signal according to the first frequency signal and the second frequency signal, the first drive signal and the second drive signal are complementary in frequency; a push-pull inverter circuit electrically connected to the drive unit, the push-pull inverter circuit is configured to output the alternating current according to the first drive signal and the second drive signal.

8. The ultrasonic transducer drive circuit of claim 7, wherein, 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 electrically connected to the control signal conversion unit, the first output end and the second output end are respectively electrically connected to the push-pull inverter circuit; 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 electrically connected to the first output end of the drive unit, the second controlled end is electrically connected to the second output end of the drive unit, and the first output end and the second output end are electrically connected to the ultrasonic transducer unit.

9. The ultrasonic transducer drive circuit of claim 8, wherein, The push-pull inverter circuit comprises a first drive branch, a second drive branch, and a transformer; an input end of the first drive branch serves as the first controlled end, an output end of the first drive branch is electrically connected to a first primary side end of the transformer, an input end of the second drive branch serves as the second controlled end, an output end of the second drive branch is electrically connected to a second primary side end of the transformer, a first secondary side end of the transformer serves as the first output end, and a second secondary side end of the transformer serves as the second output end.

10. A cosmetic device, characterized by, An ultrasonic transducer drive circuit comprising the cosmetic instrument of any one of claims 1 to 9.

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