Boost frequency modulation circuit of ultrasonic beauty instrument and ultrasonic beauty instrument

Abstract

The utility model provides a boost frequency modulation circuit of an ultrasonic beauty instrument and the ultrasonic beauty instrument, the boost frequency modulation circuit comprises a boost branch circuit used for boosting and outputting the input voltage of the ultrasonic beauty instrument, the boost branch circuit is provided with an on-off switch, the boost frequency modulation circuit also comprises a frequency modulation branch circuit, and the frequency modulation branch circuit comprises a frequency modulation optocoupler. The input end of the frequency modulation optocoupler is connected with the frequency modulation pulse end of the controller, and the output end is connected with the control end of the on-off switch. When the ultrasonic beauty instrument works, the boost branch boosts the input voltage of the ultrasonic beauty instrument and outputs the boosted voltage, at the moment, the frequency modulation pulse end of the controller inputs pulse waves with set frequency to the frequency modulation optocoupler, the frequency modulation optocoupler controls the on-off switch and the switching frequency of the boost branch at the set frequency, and therefore the boost branch is controlled to output voltage at the set frequency. The ultrasonic beauty instrument outputs ultrasonic waves at the set frequency, and the frequency accuracy of the ultrasonic waves output by the ultrasonic beauty instrument can be improved.

Description

Technical Field

[0001] This utility model relates to the field of ultrasonic beauty instrument technology, and in particular to a boost frequency modulation circuit for an ultrasonic beauty instrument and an ultrasonic beauty instrument. Background Technology

[0002] An ultrasonic beauty device is a cosmetic device that uses ultrasonic technology for skin care. Its core components typically include an ultrasonic transducer (probe), a boost circuit, and a power management module. The ultrasonic transducer emits high-frequency sound waves that act on the deep layers of the skin to achieve effects such as cleansing, firming, anti-aging, and promoting absorption. By adjusting parameters such as voltage, frequency, and cycle, the intensity, depth, and effect of the ultrasonic waves can be precisely controlled to adapt to different skin problems and care needs.

[0003] Currently, the frequency modulation function of ultrasonic beauty devices mainly utilizes a transducer core made of piezoelectric ceramic crystal material. When an alternating voltage is applied to this transducer core, the crystal vibrates mechanically due to the inverse piezoelectric effect, emitting ultrasonic waves of a certain frequency. By changing the frequency of the alternating voltage, the vibration frequency of the crystal can be adjusted, emitting ultrasonic waves of different frequencies. However, the energy conversion efficiency of piezoelectric ceramic crystals is typically only 60%–80%, with the remaining energy dissipated as heat, easily causing the ultrasonic transducer to overheat. Furthermore, the resonant frequency of the piezoelectric ceramic crystal drifts with increasing temperature, causing the output ultrasonic wave frequency to deviate from the set value. Utility Model Content

[0004] The technical problem this invention aims to solve is how to improve the accuracy of the ultrasonic frequency output by an ultrasonic beauty device.

[0005] To solve the above-mentioned technical problems, this utility model provides a boost frequency modulation circuit for an ultrasonic beauty instrument, including a boost branch for increasing the input voltage of the ultrasonic beauty instrument and having an on / off switch, and a frequency modulation branch, which includes a frequency modulation optocoupler. The input terminal of the frequency modulation optocoupler is connected to the frequency modulation pulse terminal of the controller, and the output terminal is connected to the control terminal of the on / off switch.

[0006] Furthermore, the front end of the boost branch is connected to the boost pulse terminal of the controller, and the end is connected to the boost output terminal.

[0007] Furthermore, the boost branch includes a boost optocoupler, a power management chip, a voltage regulation switch, and a boost converter. The boost optocoupler, the power management chip, and the voltage regulation switch are connected in sequence. The output terminal of the voltage regulation switch is connected to the voltage regulation output terminal. The input terminal of the boost converter is connected to the voltage regulation output terminal, and the output terminal of the boost converter is connected to the boost output terminal.

[0008] Furthermore, the boost converter includes an inductor and a capacitor, specifically connected to the voltage regulation output terminal via the inductor and to the boost output terminal via the capacitor.

[0009] Furthermore, the on / off switch is specifically an NMOS transistor, with its gate as the control terminal, its drain connected to the input terminal of the boost converter, and its source grounded.

[0010] Furthermore, the output terminal of the frequency modulation optocoupler is specifically connected to the control terminal of the on / off switch via a logic gate chip and a dual comparator.

[0011] Furthermore, it includes the controller.

[0012] This utility model also provides an ultrasonic beauty device, including an ultrasonic transducer and the above-mentioned boost frequency modulation circuit, wherein the boost frequency modulation circuit increases the input voltage and outputs it to the ultrasonic transducer.

[0013] This invention has the following beneficial effects: When the ultrasonic beauty instrument is working, the boost branch increases the input voltage of the ultrasonic beauty instrument and outputs it. At this time, the frequency modulation pulse terminal of the controller inputs a pulse wave of the set frequency to the frequency modulation optocoupler, so that the frequency modulation optocoupler controls the on / off switch and the switching frequency of the boost branch at the set frequency, thereby controlling the boost branch to output voltage at the set frequency, so that the ultrasonic beauty instrument outputs ultrasonic waves at the set frequency. Compared with the transducer core using piezoelectric ceramic crystal material, it will not cause frequency drift due to temperature rise, which can improve the accuracy of the ultrasonic frequency output by the ultrasonic beauty instrument. Attached Figure Description

[0014] Figure 1 This is the circuit schematic of the power management chip section of the boost converter branch.

[0015] Figure 2 This is the circuit diagram of the voltage regulation switch section of the boost branch.

[0016] Figure 3 This is the circuit schematic of the boost converter section where the frequency modulation branch connects to the boost branch. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to specific embodiments.

[0018] This embodiment provides an ultrasonic beauty device, including an ultrasonic transducer and a boost frequency modulation circuit. The boost frequency modulation circuit increases the input voltage and outputs it to the ultrasonic transducer. The boost frequency modulation circuit of the ultrasonic beauty device includes a boost branch, a frequency modulation branch, and a controller. The boost branch is used to increase the input voltage of the ultrasonic beauty device, the frequency modulation branch is used to control the ultrasonic output frequency of the ultrasonic beauty device, and the controller is an MCU controller, which has a boost pulse terminal U_PWR_ADJ-MCU and a frequency modulation pulse terminal U_ENG_MCU, which are used to input boost pulse waves to the boost branch and frequency modulation pulse waves to the frequency modulation branch, respectively.

[0019] The boost branch is connected to the boost pulse terminal U_PWR_ADJ-MCU of the controller at its front end and to the boost output terminal RF1 at its rear end. For example... Figure 1 , 2 As shown in Figure 3, the boost branch includes a boost optocoupler U3, a power management chip U1, a voltage regulation switch U2, a boost converter, and an on / off switch Q8. The boost optocoupler U3, the power management chip U1, and the voltage regulation switch U2 are connected in sequence. The output terminal of the voltage regulation switch U2 is connected to the voltage regulation output terminal VCC_ADJ. The input terminal of the boost converter is connected to the voltage regulation output terminal VCC_ADJ. The output terminal of the boost converter is connected to the boost output terminal RF1. The boost output terminal RF1 is connected to the ultrasonic transducer of the ultrasonic beauty instrument.

[0020] The boost optocoupler U3 includes an optical emitter D1 and a photosensor D2. The optical emitter D1 is the input terminal of the boost optocoupler U3. Its front end is connected to the power supply terminal VCC_5V via resistor R5, and its rear end is grounded via transistor Q4. A resistor R13 bridges the front and rear ends of the transistor Q4, which is an NPN transistor. Its collector is connected to the rear end of the optical emitter D3, its emitter is grounded, and its base is connected to the boost pulse terminal U_PWR_ADJ-MCU via resistor R21. In other words, the input terminal of the boost optocoupler U3 is connected to the boost pulse terminal U_PWR_ADJ-MCU of the controller. The photosensor D2 is the output terminal of the boost optocoupler U3. Its front end is connected to the power supply terminal VCC_5V, and its rear end is connected to the feedback terminal 1IN- of the power management chip U1 via resistors R17 and R16. In other words, the output terminal of the boost optocoupler U3 is connected to the feedback terminal 1IN- of the power management chip U1. In this way, the controller sends a boost pulse wave through its boost pulse terminal U_PWR_ADJ-MCU to turn on the transistor Q4, which in turn turns on the light emitter D1 of the boost optocoupler U3 and makes the light sensor D2 of the boost optocoupler U3 work, outputting a reference voltage to the feedback terminal 1IN- of the power management chip U1.

[0021] The output terminal 1OUT of the power management chip U1 is connected to the voltage regulation switch U2 via resistor R1 and terminal FB. The voltage regulation switch U2 is connected to the voltage regulation output terminal VCC_ADJ via inductor L1. In this way, the power management chip U1 can adjust the output voltage of the voltage regulation output terminal VCC_ADJ through the voltage regulation switch U2 according to the voltage change of the feedback terminal 1IN-.

[0022] The boost converter includes inductors L4 and L5, and capacitors C27, C28, C29, C30, C31, C32, C33, and C34. Specifically, the boost converter is connected to the voltage regulation output terminal VCC_ADJ via inductor L4. Capacitors C27, C28, and C29 are connected in parallel with capacitor C30, and capacitors C31, C32, and C33 are connected in parallel with capacitor C4. These two capacitor groups are connected in series between inductor L5 and ground. The connection point between the two capacitor groups is connected to the boost output terminal RF1. Therefore, the boost converter is specifically connected to the boost output terminal RF1 via capacitors.

[0023] The on / off switch Q8 is specifically an NMOS transistor, with its gate serving as the control terminal, its drain connected to the input terminal of the boost converter via resistor R41, and its source grounded. The frequency modulation branch includes a frequency modulation optocoupler U4, which comprises an optical transmitter D3 and a photosensor D4. The optical transmitter D3 is the input terminal of the frequency modulation optocoupler U4. Its front end is connected to the power supply terminal VCC_5V via resistor R26, and its rear end is grounded via transistor Q5. A resistor R27 is connected between the front and rear ends of the transistor. The transistor Q5 is an NPN transistor, with its collector connected to the rear end of the optical transmitter D3, its emitter grounded, and its base connected to the frequency modulation pulse terminal U_ENG-MCU via resistor R28. In other words, the input terminal of the frequency modulation optocoupler U4 is connected to the frequency modulation pulse terminal U_ENG_MCU of the controller. The photosensitive sensor D4 is the output terminal of the frequency modulation optocoupler U4. Its front end is connected to the power supply terminal VCC_5V, and its rear end is connected to the control terminal of the on / off switch Q8 through the logic gate chip U8 and the dual comparator U9. That is, the output terminal of the frequency modulation optocoupler U4 is connected to the control terminal of the on / off switch Q8.

[0024] When the ultrasonic beauty device is working, the boost pulse terminal U_PWR_ADJ-MCU of the controller inputs a boost pulse wave to the boost optocoupler U3, causing the boost optocoupler U3 to output a reference voltage to the feedback terminal 1IN- of the power management chip U1. According to the voltage change at the feedback terminal 1IN-, the power management chip U1 adjusts the output voltage of the voltage regulation output terminal VCC_ADJ through the voltage regulation switch U2. The output voltage of the voltage regulation output terminal VCC_ADJ is boosted to 100V after passing through the inductor and capacitor of the boost converter and outputting a boost output voltage to the boost output terminal RF1 to power the ultrasonic transducer. At this time, the frequency modulation pulse terminal U_ENG_MCU of the controller inputs a frequency modulation pulse wave of the set frequency to the frequency modulation optocoupler U4, so that the frequency modulation optocoupler U4 controls the switching frequency of the on / off switch Q8 and the boost branch at the set frequency, thereby controlling the boost branch to output voltage to the ultrasonic transducer at the set frequency, so that the ultrasonic beauty instrument outputs ultrasonic waves at the set frequency. Compared with the transducer core using piezoelectric ceramic crystal material, it will not cause frequency drift due to temperature rise, which can improve the accuracy of the ultrasonic frequency output by the ultrasonic beauty instrument.

[0025] The above description is merely an embodiment of the present invention and does not limit the scope of patent protection. Any non-substantial changes or substitutions made by those skilled in the art based on the present invention will still fall within the scope of patent protection.

Claims

1. A boost frequency modulation circuit for an ultrasonic beauty device, comprising a boost branch for increasing the input voltage of the ultrasonic beauty device to produce an output voltage, characterized in that, The boost branch has an on / off switch and also includes a frequency modulation branch. The frequency modulation branch includes a frequency modulation optocoupler. The input terminal of the frequency modulation optocoupler is connected to the frequency modulation pulse terminal of the controller, and the output terminal is connected to the control terminal of the on / off switch.

2. The boost frequency modulation circuit of the ultrasonic beauty instrument according to claim 1, characterized in that, The boost branch is connected to the boost pulse terminal of the controller at its front end and to the boost output terminal at its rear end.

3. The boost frequency modulation circuit of the ultrasonic beauty instrument according to claim 2, characterized in that, The boost branch includes a boost optocoupler, a power management chip, a voltage regulation switch, and a boost converter. The boost optocoupler, the power management chip, and the voltage regulation switch are connected in sequence. The output terminal of the voltage regulation switch is connected to the voltage regulation output terminal. The input terminal of the boost converter is connected to the voltage regulation output terminal, and the output terminal of the boost converter is connected to the boost output terminal.

4. The boost frequency modulation circuit of the ultrasonic beauty instrument according to claim 3, characterized in that, The boost converter includes an inductor and a capacitor, specifically connected to the voltage regulation output terminal via the inductor and to the boost output terminal via the capacitor.

5. The boost frequency modulation circuit of the ultrasonic beauty instrument according to claim 3, characterized in that, The on / off switch is specifically an NMOS transistor, with its gate as the control terminal, its drain connected to the input terminal of the boost converter, and its source grounded.

6. The boost frequency modulation circuit of the ultrasonic beauty instrument according to claim 1, characterized in that, The output terminal of the frequency modulation optocoupler is specifically connected to the control terminal of the on / off switch via a logic gate chip and a dual comparator.

7. The boost frequency modulation circuit of the ultrasonic beauty instrument according to claim 1, characterized in that, Including the controller.

8. An ultrasonic beauty device, characterized in that, It includes an ultrasonic transducer and a boost frequency modulation circuit as described in any one of claims 1 to 7, wherein the boost frequency modulation circuit increases the input voltage and outputs it to the ultrasonic transducer.

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