阅读说明：本技术 低噪音声波电动牙刷及其声波电机驱动电路、驱动方法 (Low-noise sound wave electric toothbrush and sound wave motor driving circuit and driving method thereof ) 是由 蔡爱琴 蒋婷觅 郭凡美 于 2020-12-28 设计创作，主要内容包括：本发明涉及一种低噪音声波电动牙刷及其声波电机驱动电路、驱动方法,其中,驱动电路包括：控制单片机,用于生成控制信号,所述控制信号包括具有预定占空比的单相直流脉冲信号；与控制单片机相连接的滤波电路,滤波电路用于将所述控制信号整滤成滤除高频信号的交流控制波；以及,与滤波电路相连接的功率放大电路,声波电机与所述功率放大电路相连接,并受控于所述交流信号工作。由于通过滤波电路滤除了控制信号中的高频信号,使得声波电机运行时声音更加低沉舒适,提高电动牙刷使用体验,且连接时只需要一个控制单片机的IO接口即可发出控制信号,节约了控制单片机的IO接口资源,且电路结构简单,成本与现有H桥相当,易于实现。(The invention relates to a low-noise sound wave electric toothbrush, a sound wave motor driving circuit and a driving method thereof, wherein the driving circuit comprises: the control single chip microcomputer is used for generating a control signal, and the control signal comprises a single-phase direct-current pulse signal with a preset duty ratio; the filter circuit is connected with the control singlechip and is used for integrally filtering the control signal into an alternating current control wave for filtering a high-frequency signal; and the sound wave motor is connected with the power amplification circuit and is controlled by the alternating current signal to work. Because high-frequency signals in the control signals are filtered through the filter circuit, sound is more sunken and comfortable when the sound wave motor operates, the use experience of the electric toothbrush is improved, the control signals can be sent out through the IO interface of only one control single chip microcomputer when the sound wave motor is connected, the IO interface resources of the control single chip microcomputer are saved, the circuit structure is simple, the cost is equivalent to that of the existing H bridge, and the realization is easy.)

1. An acoustic wave motor drive circuit, comprising:

the control single chip microcomputer is used for generating a control signal, and the control signal comprises a single-phase direct-current pulse signal with a preset duty ratio;

the filter circuit is connected with the control single chip microcomputer and is used for filtering the control signal into alternating current control waves for filtering high-frequency signals; and the number of the first and second groups,

and the sound wave motor is connected with the power amplification circuit and is controlled by the alternating current signal to work.

2. The acoustic wave motor drive circuit of claim 1 wherein the filter circuit comprises:

the low-pass filtering module is used for filtering high-frequency signals contained in the control signals to obtain first control waves;

and the high-pass filtering module is used for filtering the direct-current signals contained in the first control wave to obtain the alternating-current control wave.

3. The acoustic wave motor drive circuit according to claim 2, wherein the low pass filter module and the high pass filter module both employ RC filter circuits.

4. The acoustic wave motor drive circuit of claim 3 wherein the low pass filter module comprises: the first end of the first electron is connected with the control single chip microcomputer, the second end of the first resistor is connected with the first end of the second resistor, the first end of the first capacitor is connected with the second end of the first resistor, the second end of the first capacitor is grounded, the second end of the second resistor is connected with the first end of the second capacitor, and the second end of the second capacitor is connected with the second end of the first capacitor.

5. The acoustic wave motor drive circuit of claim 4 wherein the high pass filter module comprises: the first end of the third capacitor is connected to the first end of the second capacitor, the second end of the third capacitor is connected to the first end of the third resistor, and the second end of the third resistor is connected to the second end of the second capacitor.

6. The acoustic wave motor drive circuit according to claim 1, wherein the power amplification circuit employs a class D power amplifier.

7. A method for driving an acoustic wave motor, the method being based on a drive circuit according to any one of claims 1 to 6, comprising:

the control single chip microcomputer generates a control signal, and the control signal comprises a single-phase direct current pulse signal with a preset duty ratio;

the filter circuit filters the control signal into an alternating current control wave for filtering a high-frequency signal;

and the power amplification circuit amplifies the alternating current control wave and controls the sound wave motor to work.

8. The acoustic wave motor driving method according to claim 5, wherein the filtering circuit that integrates the control signal into an ac control wave that filters out a high frequency signal specifically comprises:

filtering a high-frequency signal contained in the control signal through the low-pass filtering module to obtain a first control wave; and the number of the first and second groups,

and filtering out the direct current signals contained in the first control wave through the high-pass filtering module to obtain the alternating current control wave.

9. The acoustic wave motor drive method of claim 5, further comprising:

and the duty ratio of the control signal is adjusted through the control single chip microcomputer so as to adjust the driving voltage of the sound wave motor.

10. A low noise acoustic wave electric toothbrush comprising an acoustic wave motor drive circuit according to any one of claims 1 to 6.

Technical Field

The invention relates to the technical field of electric toothbrushes, in particular to a low-noise sound wave electric toothbrush and a sound wave motor driving circuit and a driving method thereof.

Background

Along with the further improvement of the living quality requirements of people, the automatic cleaning nursing device is more and more widely applied in daily life, and the electric toothbrush is widely accepted due to the fact that the electric toothbrush can more effectively clean the oral cavity, more thoroughly remove dental plaque, and reduce oral diseases such as gingivitis, periodontal disease, gingival bleeding and the like. The existing sound wave toothbrush is a more common electric toothbrush, and the sound wave toothbrush refers to that the vibration frequency of the bristles/brush head is consistent with or close to the sound wave frequency, so the sound wave toothbrush is also called as a sound wave vibration toothbrush.

The sound wave electric toothbrush is driven by a sound wave motor, and the sound wave motor belongs to an alternating current motor, so that alternating current is required for driving. The H-bridge is generally adopted to send unfiltered square waves to drive the sound wave motor to work at present due to the limitation of cost, and sharp and harsh sound can be sent when the high-frequency signals are input into the sound wave motor due to the fact that the square waves have high-frequency signals, so that the electric toothbrush is high in noise during working, and user experience is influenced.

Disclosure of Invention

In order to solve the technical problems, the invention provides a low-noise sound wave electric toothbrush, a sound wave motor driving circuit and a driving method thereof, and the low-noise sound wave electric toothbrush has the advantage of reducing noise.

In order to achieve the purpose, the technical scheme of the invention is as follows:

an acoustic wave motor drive circuit comprising:

the control single chip microcomputer is used for generating a control signal, and the control signal comprises a single-phase direct-current pulse signal with a preset duty ratio;

the filter circuit is connected with the control single chip microcomputer and is used for filtering the control signal into alternating current control waves for filtering high-frequency signals; and the number of the first and second groups,

and the sound wave motor is connected with the power amplification circuit and is controlled by the alternating current signal to work.

The technical scheme is realized, a single-phase direct current pulse signal with a preset duty ratio is generated by a control single chip microcomputer to control the sound wave motor, a filter circuit filters the control signal, high-frequency signals in the control signal are filtered out to obtain alternating current control waves, and the sound wave motor is driven after the high-frequency signals are amplified by a power amplification circuit; because high-frequency signals in the control signals are filtered through the filter circuit, sound is more sunken and comfortable when the sound wave motor operates, the use experience of the electric toothbrush is improved, the control signals can be sent out through the IO interface of only one control single chip microcomputer when the sound wave motor is connected, the IO interface resources of the control single chip microcomputer are saved, the circuit structure is simple, the cost is equivalent to that of the existing H bridge, and the realization is easy.

As a preferable aspect of the present invention, the filter circuit includes:

the low-pass filtering module is used for filtering high-frequency signals contained in the control signals to obtain first control waves;

and the high-pass filtering module is used for filtering the direct-current signals contained in the first control wave to obtain the alternating-current control wave.

According to the technical scheme, the high-frequency part and the direct-current part of the control signal are filtered by the low-pass filtering module and the high-pass filtering module respectively, so that the vertically symmetrical alternating-current signals are obtained.

As a preferable scheme of the present invention, the low-pass filtering module and the high-pass filtering module both employ RC filtering circuits.

As a preferable aspect of the present invention, the low-pass filtering module includes: the first end of the first electron is connected with the control single chip microcomputer, the second end of the first resistor is connected with the first end of the second resistor, the first end of the first capacitor is connected with the second end of the first resistor, the second end of the first capacitor is grounded, the second end of the second resistor is connected with the first end of the second capacitor, and the second end of the second capacitor is connected with the second end of the first capacitor.

As a preferred aspect of the present invention, the high-pass filtering module includes: the first end of the third capacitor is connected to the first end of the second capacitor, the second end of the third capacitor is connected to the first end of the third resistor, and the second end of the third resistor is connected to the second end of the second capacitor.

As a preferred embodiment of the present invention, the power amplification circuit employs a class D power amplifier.

The invention also provides a driving method of the acoustic wave motor, which is based on the driving circuit according to any one of the above technical schemes, and comprises the following steps:

the control single chip microcomputer generates a control signal, and the control signal comprises a single-phase direct current pulse signal with a preset duty ratio;

the filter circuit filters the control signal into an alternating current control wave for filtering a high-frequency signal;

and the power amplification circuit amplifies the alternating current control wave and controls the sound wave motor to work.

The technical scheme is realized, a single-phase direct current pulse signal with a preset duty ratio is generated by a control single chip microcomputer to control the sound wave motor, a filter circuit filters the control signal, high-frequency signals in the control signal are filtered out to obtain alternating current control waves, and the sound wave motor is driven after the high-frequency signals are amplified by a power amplification circuit; because the high-frequency signal in the control signal is filtered by the filter circuit, the sound is more sunken and comfortable when the sound wave motor runs, and the use experience of the electric toothbrush is improved.

As a preferable aspect of the present invention, the filtering circuit that integrates and filters the control signal into an ac control wave that filters a high frequency signal specifically includes:

filtering a high-frequency signal contained in the control signal through the low-pass filtering module to obtain a first control wave; and the number of the first and second groups,

and filtering out the direct current signals contained in the first control wave through the high-pass filtering module to obtain the alternating current control wave.

According to the technical scheme, the high-frequency part and the direct-current part of the control signal are filtered by the low-pass filtering module and the high-pass filtering module respectively, so that the vertically symmetrical alternating-current signals are obtained.

As a preferred aspect of the present invention, the method further comprises:

and the duty ratio of the control signal is adjusted through the control single chip microcomputer so as to adjust the driving voltage of the sound wave motor.

The technical scheme is realized, so that the requirement of the sound wave motor on the driving voltage is met.

The invention also provides a low-noise sound wave electric toothbrush which comprises the sound wave motor driving circuit in any technical scheme.

In conclusion, the invention has the following beneficial effects:

the embodiment of the invention provides a low-noise sound wave electric toothbrush, a sound wave motor driving circuit and a driving method thereof, wherein the driving circuit comprises: the control single chip microcomputer is used for generating a control signal, and the control signal comprises a single-phase direct-current pulse signal with a preset duty ratio; the filter circuit is connected with the control single chip microcomputer and is used for filtering the control signal into alternating current control waves for filtering high-frequency signals; and the power amplification circuit is connected with the filter circuit, and the sound wave motor is connected with the power amplification circuit and controlled by the alternating current signal to work. The control single chip generates a single-phase direct current pulse signal with a preset duty ratio to control the sound wave motor, the filter circuit filters the control signal, high-frequency signals in the control signal are filtered to obtain alternating current control waves, and the alternating current control waves are amplified by the power amplification circuit and then drive the sound wave motor; because high-frequency signals in the control signals are filtered through the filter circuit, sound is more sunken and comfortable when the sound wave motor operates, the use experience of the electric toothbrush is improved, the control signals can be sent out through the IO interface of only one control single chip microcomputer when the sound wave motor is connected, the IO interface resources of the control single chip microcomputer are saved, the circuit structure is simple, the cost is equivalent to that of the existing H bridge, and the realization is easy.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a control block diagram according to a first embodiment of the present invention.

Fig. 2 is a schematic circuit diagram of a filter circuit according to an embodiment of the present invention.

FIG. 3 is a flowchart of a method according to a second embodiment of the present invention.

The corresponding part names indicated by the numbers and letters in the drawings:

1. controlling the single chip microcomputer; 2. a filter circuit; 21. a low-pass filtering module; r1, a first resistor; r2, a second resistor; c1, a first capacitance; c2, a second capacitor; 22. a high-pass filtering module; c3, a third capacitance; r3, third resistor; 3. a power amplifier circuit.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example one

An acoustic wave motor drive circuit, as shown in fig. 1 and 2, comprising: the control single chip microcomputer 1 is used for generating a control signal, and the control signal comprises a single-phase direct-current pulse signal with a preset duty ratio; the filter circuit 2 is connected with the control singlechip 1, and the filter circuit 2 is used for filtering the control signal into an alternating current control wave for filtering a high-frequency signal; and the power amplification circuit 3 is connected with the filter circuit 2, and the sound wave motor is connected with the power amplification circuit 3 and is controlled by an alternating current signal to work.

Specifically, the filter circuit 2 includes: a low-pass filtering module 21, configured to filter a high-frequency signal included in the control signal to obtain a first control wave; a high-pass filtering module 22, configured to filter a dc signal included in the first control wave to obtain an ac control wave; the low-pass filter module 21 and the high-pass filter module 22 both adopt the RC filter circuit 2, and the high-frequency part and the direct-current part of the control signal are respectively filtered by the low-pass filter module 21 and the high-pass filter module 22, so that vertically symmetrical alternating-current signals are obtained, and the low-pass filter module has a simple structure and low cost.

The low-pass filtering module 21 includes: first resistance R1, second resistance R2, first electric capacity C1 and second electric capacity C2, the first end of first electron is connected with control singlechip 1, the second end of first resistance R1 is connected with the first end of second resistance R2, the first end of first electric capacity C1 links to each other with the second end of first resistance R1, the second end ground of first electric capacity C1, the second end of second resistance R2 is connected with the first end of second electric capacity C2, the second end of second electric capacity C2 is connected with the second end of first electric capacity C1.

The high-pass filtering module 22 comprises: a third capacitor C3 and a third resistor R3, wherein a first terminal of the third capacitor C3 is connected to a first terminal of the second capacitor C2, a second terminal of the third capacitor C3 is connected to a first terminal of the third resistor R3, and a second terminal of the third resistor R3 is connected to a second terminal of the second capacitor C2.

The power amplifying circuit 3 adopts a D-type power amplifier, the power amplifying circuit 3 is connected with the output end of the high-pass filtering module 22, and the output end of the power amplifying circuit 3 is connected with the sound wave motor, so that the amplifying processing of the control signal is realized.

The control single chip microcomputer 1 generates a single-phase direct current pulse signal with a preset duty ratio to control the sound wave motor, the filter circuit 2 filters the control signal, high-frequency signals in the control signal are filtered out to obtain alternating current control waves, and the alternating current control waves are amplified by the power amplification circuit 3 and then drive the sound wave motor; because the high-frequency signal in the control signal is filtered by the filter circuit 2, the sound of the sound wave motor is more sunken and comfortable when the sound wave motor runs, the use experience of the electric toothbrush is improved, and the control signal can be sent out only by one IO interface of the control singlechip 1 when the sound wave motor is connected, so that the IO interface resource of the control singlechip 1 is saved, and the circuit has a simple structure, has the cost equivalent to that of the conventional H bridge and is easy to realize; and the drive circuit of the embodiment enables the processed AC control wave to have smooth waveform, the intensity of the adjustment signal is more convenient, the waveform only has voltage change, the shape can not change, and the weak signal of the existing H bridge has more sharp noise.

Example two

A method for driving an acoustic wave motor, the method being based on the driving circuit according to the first embodiment, as shown in fig. 3, and comprising:

s100, the single chip microcomputer 1 is controlled to generate a control signal, the control signal comprises a single-phase direct current pulse signal with a preset duty ratio, and meanwhile, the duty ratio of the control signal can be adjusted through the control single chip microcomputer 1 to adjust the driving voltage of the sound wave motor, so that the requirement of the sound wave motor on the driving voltage is met.

S200, the filter circuit 2 filters the control signal into an alternating current control wave for filtering the high-frequency signal.

S200 specifically comprises the following steps:

s210, filtering a high-frequency signal contained in the control signal through a low-pass filtering module 21 to obtain a first control wave; and the number of the first and second groups,

s220, the high-pass filtering module 22 filters the dc signal included in the first control wave to obtain an ac control wave.

The high-frequency part and the direct-current part of the control signal are respectively filtered by the low-pass filtering module 21 and the high-pass filtering module 22, so that the vertically symmetrical alternating-current signals are obtained.

And S300, the power amplification circuit 3 amplifies the alternating current control wave and controls the sound wave motor to work.

The control single chip microcomputer 1 generates a single-phase direct current pulse signal with a preset duty ratio to control the sound wave motor, the filter circuit 2 filters the control signal, high-frequency signals in the control signal are filtered out to obtain alternating current control waves, and the alternating current control waves are amplified by the power amplification circuit 3 and then drive the sound wave motor; because high-frequency signals in the control signals are filtered through the filter circuit 2, sound is more sunken and comfortable when the sound wave motor runs, and the use experience of the electric toothbrush is improved.

EXAMPLE III

A low noise acoustic wave electric toothbrush comprising the acoustic wave motor drive circuit of embodiment one.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.