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Low-noise sound wave electric toothbrush, sound wave motor driving circuit and driving method thereof

A motor drive circuit, filter circuit technology, applied in chemical instruments and methods, cleaning methods and utensils, cleaning methods using liquids, etc. Experience, deep and comfortable sound, easy-to-achieve effects

Pending Publication Date: 2021-04-30
SHANGHAI DIRECT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to cost constraints, the H-bridge is usually used to send out unfiltered square waves to drive the sonic motor. Due to the presence of high-frequency signals in the square wave, when the high-frequency signal is input into the sonic motor, it will emit a sharp and harsh sound, making the electric toothbrush noisy when it is working. Larger, affecting user experience

Method used

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  • Low-noise sound wave electric toothbrush, sound wave motor driving circuit and driving method thereof
  • Low-noise sound wave electric toothbrush, sound wave motor driving circuit and driving method thereof
  • Low-noise sound wave electric toothbrush, sound wave motor driving circuit and driving method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A sonic wave motor drive circuit, such as figure 1 and figure 2 As shown, it includes: a control single-chip microcomputer 1, which is used to generate a control signal, and the control signal includes a single-phase DC pulse signal with a predetermined duty ratio; a filter circuit 2 connected to the control single-chip microcomputer 1, and the filter circuit 2 is used to adjust the control signal Filtering the AC control wave that filters out the high-frequency signal; and, the power amplifier circuit 3 connected to the filter circuit 2, and the acoustic wave motor connected to the power amplifier circuit 3, and controlled by the AC signal to work.

[0043] Specifically, the filter circuit 2 includes: a low-pass filter module 21, which is used to filter out the high-frequency signal contained in the control signal to obtain the first control wave; a high-pass filter module 22, which is used to filter out the direct current contained in the first control wave. signal ...

Embodiment 2

[0049] A method for driving an acoustic wave motor, the method is based on the driving circuit described in Embodiment 1, such as image 3 shown, including:

[0050] S100, controlling the single-chip microcomputer 1 to generate a control signal, the control signal includes a single-phase DC pulse signal with a predetermined duty ratio, and at the same time, the driving voltage of the acoustic wave motor can be adjusted by controlling the single-chip microcomputer 1 to adjust the duty ratio of the control signal, so as to meet the requirements of the acoustic wave motor. The motor's demand for drive voltage.

[0051] S200, the filter circuit 2 filters the control signal into an AC control wave that removes high-frequency signals.

[0052] S200 specifically includes:

[0053] S210, filter out the high-frequency signal contained in the control signal through the low-pass filter module 21 to obtain the first control wave; and,

[0054] S220. Filter the DC signal included in the...

Embodiment 3

[0059] A low-noise sonic electric toothbrush includes the sonic motor driving circuit described in the first embodiment.

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Abstract

The invention relates to a low-noise sound wave electric toothbrush, a sound wave motor driving circuit and a driving method thereof. The driving circuit comprises a control single-chip microcomputer which is used for generating a control signal, and the control signal comprises a single-phase DC pulse signal with a preset duty ratio; a filter circuit is connected with the control single-chip microcomputer and used for filtering the control signal into an alternating-current control wave from which a high-frequency signal is filtered; a power amplification circuit is connected with the filter circuit, and the sound wave motor is connected with the power amplification circuit and is controlled by the alternating current signal to work. A high-frequency signal in the control signal is filtered through the filter circuit, so that the sound wave motor is lower and more comfortable in sound during operation, the use experience of the electric toothbrush is improved, the control signal can be sent out only through one IO interface of the control single chip microcomputer during connection, IO interface resources of the control single chip microcomputer are saved, and the circuit is simple in structure and convenient to use. The cost is equivalent to that of the existing H bridge.

Description

technical field [0001] The invention relates to the technical field of electric toothbrushes, in particular to a low-noise sonic electric toothbrush and its sonic motor driving circuit and driving method. Background technique [0002] With the further improvement of people's demand for quality of life, in daily life, the application of automatic cleaning and nursing devices is becoming more and more extensive. Because electric toothbrushes can clean the mouth more effectively, remove dental plaque more thoroughly, and reduce gingivitis, periodontal Oral diseases such as gum disease and bleeding gums are widely accepted. At present, a sonic toothbrush is a commonly used electric toothbrush. A sonic toothbrush means that the vibration frequency of the bristles / brush head is the same or similar to that of the sound wave, so it is also called a sonic vibration toothbrush. [0003] The sonic electric toothbrush is driven by a sonic motor. Since the sonic motor belongs to an alte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61C17/20A61C17/22
CPCA61C17/20A61C17/221
Inventor 蔡爱琴蒋婷觅郭凡美
Owner SHANGHAI DIRECT TECH CO LTD
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