阅读说明：本技术 一种用于调节声波电机振动的控制电路及方法 (Control circuit and method for adjusting vibration of sound wave motor ) 是由 路少伟 王肖友 于 2019-10-12 设计创作，主要内容包括：本发明公开了一种用于调节声波电机振动的控制电路及方法,属于电动牙刷技术领域,通过微控制单元；H桥单元,所述H桥单元与所述微控制单元连接,且,所述H桥单元的电源正极端与电源正极VCC连接,所述H桥单元的电源负极端接地；声波电机,所述声波电机与所述H桥单元连接,通过所述H桥单元为所述声波电机提供交流方波驱动信号,从而解决了现有技术中的电动牙刷每个挡位的交流驱动信号的模式不能随意调节,造成用户只能在电动牙刷预设的模式之间切换,无法任意调节电动牙刷的频率和/或力度的技术问题,达到了智能化程度高,声波电机的振动频率和振动力度可以无极调节,用户可以选择任意一个想要的频点/力度点的技术效果。(The invention discloses a control circuit and a method for adjusting vibration of a sound wave motor, which belong to the technical field of electric toothbrushes and are realized by a micro-control unit; the H bridge unit is connected with the micro control unit, the positive power supply terminal of the H bridge unit is connected with the positive power supply terminal VCC, and the negative power supply terminal of the H bridge unit is grounded; the sound wave motor, the sound wave motor with the H bridge unit is connected, through the H bridge unit does the sound wave motor provides interchange square wave drive signal to solved the mode of the interchange drive signal of every fender position of electric toothbrush among the prior art and can not adjusted at will, caused the user can only switch between the mode that electric toothbrush predetermines, can not adjust the technical problem of electric toothbrush's frequency and/or dynamics at will, reached intelligent degree height, the vibration frequency and the vibration dynamics of sound wave motor can infinitely variable control, the user can select the technological effect of any one frequency point/dynamics point that wants.)

1. A control circuit for regulating vibration in a sonic motor, said control circuit comprising:

a micro control unit;

the H bridge unit is connected with the micro control unit, the positive power supply terminal of the H bridge unit is connected with the positive power supply terminal VCC, and the negative power supply terminal of the H bridge unit is grounded;

the sound wave motor is connected with the H-bridge unit and provides an alternating-current square wave driving signal for the sound wave motor through the H-bridge unit.

2. The control circuit of claim 1, wherein the H-bridge unit comprises:

the first MOS tube is connected with a first pin of the micro control unit;

the second MOS tube is connected with a second pin of the micro control unit;

the third MOS tube is connected with a third pin of the micro control unit;

and the fourth MOS tube is connected with a fourth pin of the micro control unit.

3. The control circuit of claim 2, wherein the first and third MOS transistors are P-channel field effect transistors.

4. The control circuit of claim 2, wherein the second and fourth MOS transistors are N-channel field effect transistors.

5. The control circuit of claim 1, wherein the micro control unit further comprises a fifth pin, wherein the fifth pin is an input pin for an external control signal.

6. The control circuit of claim 2, wherein when the first pin and the third pin output a low level, the first MOS transistor and the third MOS transistor are turned on; when the second pin and the fourth pin output high levels, the second MOS tube and the fourth MOS tube are conducted; according to a preset logic truth rule, when the first pin and the second pin are 0 and the third pin and the fourth pin are 1, the first MOS transistor is turned on, the second MOS transistor is turned off, the third MOS transistor is turned off and the fourth MOS transistor is turned on, and a power supply supplies power to the sound wave motor through the first MOS transistor and the fourth MOS transistor, so that the sound wave motor is biased in the forward direction.

7. The control circuit according to claim 6, wherein when all of the first pin, the second pin, the third pin, and the fourth pin are 1, the first MOS transistor and the third MOS transistor are turned off, the second MOS transistor and the fourth MOS transistor are turned on, the current of the sonic motor freewheels through the second MOS transistor and the fourth MOS transistor and gradually decreases, and the sonic motor returns to a zero bias position.

8. A control method for regulating vibration of a sonic motor for controlling a control circuit for regulating vibration of a sonic motor as claimed in any of claims 1-7, characterized in that the control method comprises:

obtaining a first alternating-current square wave signal of the sound wave motor;

obtaining a first vibration frequency of the sonic motor;

a fifth pin of the micro control unit receives a first control signal input from the outside;

adjusting the first vibration frequency according to the first alternating-current square wave signal and the first control signal so as to enable the first vibration frequency to change linearly;

a fifth pin of the micro control unit receives a second control signal input from the outside;

and stopping the current frequency of the sound wave motor to a second vibration frequency according to the second control signal, wherein the second vibration frequency is the frequency when the micro control unit receives the second control signal.

9. The control method according to claim 8, characterized by further comprising:

obtaining a second alternating-current square wave signal of the sound wave motor;

obtaining a first duty ratio of the second alternating-current square wave signal;

a fifth pin of the micro control unit receives a third control signal input from the outside;

adjusting the first duty ratio according to the second alternating current square wave signal and the third control signal so as to enable the first duty ratio to change linearly;

a fifth pin of the micro control unit receives a fourth control signal input from the outside;

and stopping the current duty ratio of the second alternating-current square wave signal to a second duty ratio according to the fourth control signal, and obtaining the current vibration strength of the sound wave motor according to the second duty ratio, wherein the second duty ratio is a value when the micro control unit receives the fourth control signal.

10. The control method of claim 8, wherein the fifth pin is connected to a push button switch of the electric toothbrush.

Technical Field

The invention relates to the technical field of electric toothbrushes, in particular to a control circuit and a method for adjusting vibration of a sound wave motor.

Background

The electric toothbrush using the sound wave motor has the advantages that the swinging times of the brush head per minute are determined by the vibration frequency of the sound wave motor, and the swinging force of the brush head is determined by the vibration intensity of the sound wave motor. At present, electric toothbrushes using a sound wave motor are all provided with a plurality of different gears when leaving a factory, and are solidified in a main control chip of the electric toothbrush. When the user uses the electric toothbrush, the user switches between the preset gears by pressing a button on the electric toothbrush. The frequency and voltage effective value of the alternating current signal for supplying power to the sound wave motor are different among different preset gears, and the alternating current signal with periodically changed frequency or voltage effective value is sometimes used for driving the sound wave motor.

However, the applicant of the present invention finds that at least the following technical problems exist in the prior art in implementing the embodiments of the present application:

although an electric toothbrush can have a plurality of different gears, the mode of the alternating current driving signal of each gear is solidified when the electric toothbrush leaves a factory and cannot be adjusted freely. That is, the user can only switch between the preset modes of the electric toothbrush, and cannot operate the electric toothbrush at any frequency and/or force desired by the user.

Disclosure of Invention

The invention provides a control circuit and a control method for adjusting vibration of a sound wave motor, which are used for solving the technical problems that in the prior art, the mode of an alternating current driving signal of each gear of an electric toothbrush cannot be adjusted at will, so that a user can only switch between preset modes of the electric toothbrush, and the frequency and/or the force of the electric toothbrush cannot be adjusted at will, and the technical effects that the intelligent degree is high, the vibration frequency and the vibration force of the sound wave motor can be adjusted infinitely, and the user can select any desired frequency point/force point are achieved.

In a first aspect, the present invention provides a control circuit for regulating vibration of a sonic motor, the control circuit comprising: a micro control unit; the H bridge unit is connected with the micro control unit, the positive power supply terminal of the H bridge unit is connected with the positive power supply terminal VCC, and the negative power supply terminal of the H bridge unit is grounded; the sound wave motor is connected with the H-bridge unit and provides an alternating-current square wave driving signal for the sound wave motor through the H-bridge unit.

Preferably, the H-bridge unit includes: the first MOS tube is connected with a first pin of the micro control unit; the second MOS tube is connected with a second pin of the micro control unit; the third MOS tube is connected with a third pin of the micro control unit; and the fourth MOS tube is connected with a fourth pin of the micro control unit.

Preferably, the first MOS transistor and the third MOS transistor are P-channel field effect transistors.

Preferably, the second MOS tube and the fourth MOS tube are N-channel field effect transistors.

Preferably, the micro control unit further includes a fifth pin, wherein the fifth pin is an input pin of an external control signal.

Preferably, when the first pin and the third pin output low levels, the first MOS transistor and the third MOS transistor are turned on; when the second pin and the fourth pin output high levels, the second MOS tube and the fourth MOS tube are conducted; according to a preset logic truth rule, when the first pin and the second pin are 0 and the third pin and the fourth pin are 1, the first MOS transistor is turned on, the second MOS transistor is turned off, the third MOS transistor is turned off and the fourth MOS transistor is turned on, and a power supply supplies power to the sound wave motor through the first MOS transistor and the fourth MOS transistor, so that the sound wave motor is biased in the forward direction.

Preferably, when the first pin, the second pin, the third pin and the fourth pin are all 1, the first MOS transistor and the third MOS transistor are turned off, the second MOS transistor and the fourth MOS transistor are turned on, the current of the acoustic wave motor flows through the second MOS transistor and the fourth MOS transistor and gradually decreases, and the acoustic wave motor returns to a zero offset position.

In a second aspect, the present invention further provides a control method for adjusting vibration of a sonic motor, for controlling the aforementioned control circuit for adjusting vibration of a sonic motor, the control method comprising: obtaining a first alternating-current square wave signal of the sound wave motor; obtaining a first vibration frequency of the sonic motor; a fifth pin of the micro control unit receives a first control signal input from the outside; adjusting the first vibration frequency according to the first alternating-current square wave signal and the first control signal so as to enable the first vibration frequency to change linearly; a fifth pin of the micro control unit receives a second control signal input from the outside; and stopping the current frequency of the sound wave motor to a second vibration frequency according to the second control signal, wherein the second vibration frequency is the frequency when the micro control unit receives the second control signal.

Preferably, the control method further includes: obtaining a second alternating-current square wave signal of the sound wave motor; obtaining a first duty ratio of the second alternating-current square wave signal; a fifth pin of the micro control unit receives a third control signal input from the outside; adjusting the first duty ratio according to the second alternating current square wave signal and the third control signal so as to enable the first duty ratio to change linearly; a fifth pin of the micro control unit receives a fourth control signal input from the outside; and stopping the current duty ratio of the second alternating-current square wave signal to a second duty ratio according to the fourth control signal, and obtaining the current vibration strength of the sound wave motor according to the second duty ratio, wherein the second duty ratio is a value when the micro control unit receives the fourth control signal.

Preferably, the fifth pin is connected to a push button switch of the electric toothbrush.

One or more technical solutions in the embodiments of the present invention at least have one or more of the following technical effects:

the embodiment of the invention provides a control circuit and a method for adjusting vibration of a sound wave motor, wherein the control circuit comprises: little the control unit, H bridge unit and acoustic wave motor, wherein, H bridge unit and little the control unit connection, and, the power positive terminal and the anodal VCC of power of H bridge unit are connected, and the power negative terminal ground connection of H bridge unit, and then with acoustic wave motor and H bridge unit connection, provide interchange square wave drive signal for the acoustic wave motor through H bridge unit. When the output states of the four pins of the MCU are periodically switched between state 1 and state 2, the frequency of switching the MCU between state 1 and state 2 is f. If f is fixed, the vibration frequency of the acoustic wave motor is also fixed frequency; if f is linearly changed, the vibration frequency of the acoustic wave motor is also linearly changed. When f is gradually increased and then gradually decreased along with time, voltage waveforms at two ends of the sound wave motor can be obtained. When the CTRL pin of the micro-control unit receives an input control signal, the micro-control unit makes f start to change linearly, and when the input control signal of the CTRL is received again, the micro-control unit makes f stop at the frequency when the CTRL signal is received. The CTRL signal can be received on a button switch of the electric brush, so that a user can perform stepless frequency modulation by pressing the switch, and the vibration frequency of the sound wave motor is stopped at the frequency required by the user, thereby solving the technical problems that in the prior art, the mode of the alternating current driving signal of each gear of the electric toothbrush can not be adjusted at will, the user can only switch between the preset modes of the electric toothbrush, and the frequency and/or the force of the electric toothbrush can not be adjusted at will, achieving the technical effects of high intelligent degree, stepless adjustment of the vibration frequency and the vibration force of the sound wave motor, and selection of any desired frequency point/force point by the user.

The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.

Drawings

FIG. 1 is a schematic diagram of a control circuit for regulating vibration of a sonic motor in accordance with an embodiment of the present invention;

FIG. 2 is a schematic diagram of another control circuit for regulating vibration of a sonic motor in accordance with embodiments of the present invention;

FIG. 3 is a flow chart illustrating a control method for regulating vibration of a sonic motor in accordance with an embodiment of the present invention;

FIG. 4 is a schematic diagram of an AC square wave signal at two ends of a sonic motor in a control method for adjusting vibration of the sonic motor according to an embodiment of the present invention;

FIG. 5 is a basic waveform diagram of stepless frequency modulation of the sonic motor according to the embodiment of the present invention;

FIG. 6 is another schematic diagram of an AC square wave signal across the sonic motor for use in a control method for regulating vibration of the sonic motor in accordance with an embodiment of the present invention;

fig. 7 is a basic waveform diagram of the stepless adjusting force of the acoustic wave motor in the embodiment of the invention.

Description of reference numerals: the device comprises a first MOS tube 1, a second MOS tube 2, a third MOS tube 3, a fourth MOS tube 4, a sound wave motor 5, a micro control unit 6 and a motor control chip 7.

Detailed Description

The embodiment of the application provides a control circuit and a method for adjusting vibration of a sound wave motor, and solves the technical problems that in the prior art, the mode of an alternating current driving signal of each gear of an electric toothbrush can not be adjusted at will, so that a user can only switch between preset modes of the electric toothbrush, and the frequency and/or the force of the electric toothbrush can not be adjusted at will.

The technical scheme in the embodiment of the invention has the following general idea:

the embodiment of the invention provides a control circuit and a method for adjusting vibration of a sound wave motor, wherein the control circuit comprises: a micro control unit; the H bridge unit is connected with the micro control unit, the positive power supply terminal of the H bridge unit is connected with the positive power supply terminal VCC, and the negative power supply terminal of the H bridge unit is grounded; the sound wave motor, the sound wave motor with the H bridge unit is connected, through the H bridge unit does the sound wave motor provides interchange square wave drive signal to reached intelligent degree height, the vibration frequency and the vibration dynamics of sound wave motor can infinitely variable control, and the user can select the technological effect of the frequency point/dynamics point that arbitrary one wanted.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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.