CN112217442B - Control method for adjusting vibration of acoustic wave motor - Google Patents
Control method for adjusting vibration of acoustic wave motor Download PDFInfo
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- CN112217442B CN112217442B CN202011078192.XA CN202011078192A CN112217442B CN 112217442 B CN112217442 B CN 112217442B CN 202011078192 A CN202011078192 A CN 202011078192A CN 112217442 B CN112217442 B CN 112217442B
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 230000008859 change Effects 0.000 claims abstract description 11
- 230000005669 field effect Effects 0.000 claims description 12
- 230000003247 decreasing effect Effects 0.000 claims description 8
- 230000001276 controlling effect Effects 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 7
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 230000010355 oscillation Effects 0.000 description 4
- 230000001680 brushing effect Effects 0.000 description 3
- 230000002596 correlated effect Effects 0.000 description 3
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- 238000009792 diffusion process Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 210000000214 mouth Anatomy 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/032—Reciprocating, oscillating or vibrating motors
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C17/00—Devices for cleaning, polishing, rinsing or drying teeth, teeth cavities or prostheses; Saliva removers; Dental appliances for receiving spittle
- A61C17/16—Power-driven cleaning or polishing devices
- A61C17/22—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like
- A61C17/32—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like reciprocating or oscillating
- A61C17/34—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like reciprocating or oscillating driven by electric motor
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/047—V/F converter, wherein the voltage is controlled proportionally with the frequency
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- Health & Medical Sciences (AREA)
- Dentistry (AREA)
- Epidemiology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Brushes (AREA)
- Control Of Direct Current Motors (AREA)
Abstract
The patent relates to a control method for adjusting vibration of an acoustic wave motor, comprising the following steps: obtaining a first alternating current square wave signal and a first vibration frequency of an acoustic wave motor; a fifth input pin of the micro control unit receives a first control signal input from the outside; according to the first alternating current square wave signal and the first control signal, adjusting the vibration frequency to enable the vibration frequency to change linearly; a fifth pin of the micro control unit receives a second control signal input from the outside; and according to the second control signal, enabling the current frequency of the sound wave motor to stay on a second vibration frequency, wherein the second vibration frequency is the frequency when the micro control unit receives the second control signal. The method can improve the convenience degree and the adjusting range of the control of the acoustic wave motor.
Description
The present application requests priority from chinese patent application 201910966968.2, the content of which is also included in the present application.
Technical Field
The invention relates to the technical field of electric toothbrushes, in particular to a control method for adjusting vibration of an acoustic wave motor.
Background
An electric toothbrush using an acoustic wave motor has a brush head whose oscillation frequency per minute is determined by the oscillation frequency of the acoustic wave motor, and has a brush head whose oscillation force is determined by the oscillation intensity of the acoustic wave motor. At present, an electric toothbrush using an acoustic wave motor is provided with a plurality of different gears when leaving a factory, and the gears are solidified in a main control chip of the electric toothbrush. When the user uses the electric toothbrush, the user switches between preset gears by pressing a button on the electric toothbrush. The frequency and the voltage effective value of the alternating current signal for supplying power to the sound wave motor are different from each other among different preset gears, and the sound wave motor is sometimes driven by the alternating current signal with periodically changed frequency or voltage effective value.
In the prior art, one type of electric toothbrush is solidified when leaving the factory and cannot be adjusted at will in the process of using an acoustic wave motor to drive the toothbrush, and although one electric toothbrush can have a plurality of different gears, the mode of alternating current driving signals of each gear is solidified when leaving the factory. That is, the user can only switch between preset modes of the electric toothbrush, and cannot work the electric toothbrush at any frequency and/or power desired by the user.
In the prior art, an electric toothbrush can be accelerated and decelerated by using an upper button and a lower button, but the electric toothbrush has a limited space, and is inconvenient to operate.
In the prior art, when the electric toothbrush is used, although one larger key can be used for speed regulation, the mode is single, and different tooth brushing requirements cannot be matched through speed regulation under multiple modes.
Disclosure of Invention
The invention aims to provide a control circuit and a control method for adjusting vibration of an acoustic wave motor, which are used for solving the problems in the prior art.
For this reason, the technical scheme that this patent provided includes:
In a first aspect, the present invention provides a control method for adjusting vibration of an acoustic wave motor, for controlling a control circuit for adjusting vibration of an acoustic wave motor, the control circuit for adjusting vibration of an acoustic wave motor comprising: a micro control unit; the H bridge unit is connected with the micro control unit, the positive power end of the H bridge unit is connected with the positive power end VCC, and the negative power end of the H bridge unit is grounded; the sound wave motor is connected with the H bridge unit, and an alternating-current square wave driving signal is provided for the sound wave motor through the H bridge unit; the control method comprises the following steps: obtaining a first alternating-current square wave signal of the acoustic wave motor and an input pin of a first vibration frequency micro control unit to receive a first control signal input from the outside; according to the first alternating current square wave signal and the first control signal, adjusting the vibration frequency to enable the dynamic frequency to change linearly; an input pin of the micro control unit receives a first control signal input from the outside; according to the first alternating current square wave signal and the first control signal, the first duty ratio is adjusted so that the first duty ratio is linearly changed; the input pin of the micro control unit receives a second control signal input from the outside; according to the second control signal, the vibration frequency of the sound wave motor is kept at a second vibration frequency; the second vibration frequency is the vibration frequency when the micro control unit receives the second control signal.
In a second aspect, the present invention provides a control method for adjusting vibration of an acoustic wave motor for controlling a control circuit for adjusting vibration of an acoustic wave motor including: a micro control unit; the H bridge unit is connected with the micro control unit, the positive power end of the H bridge unit is connected with the positive power end VCC, and the negative power end of the H bridge unit is grounded; the sound wave motor is connected with the H bridge unit, and an alternating-current square wave driving signal is provided for the sound wave motor through the H bridge unit; the control method comprises the following steps: obtaining a first alternating current square wave signal and a first duty ratio of the acoustic wave motor; an input pin of the micro control unit receives a first control signal input from the outside; according to the first alternating current square wave signal and the first control signal, the first duty ratio is adjusted so that the first duty ratio is linearly changed; the input pin of the micro control unit receives a second control signal input from the outside; and according to the second control signal, the duty ratio of the driving waveform of the acoustic wave motor is kept at a second duty ratio, wherein the second duty ratio is the duty ratio when the micro control unit receives the second control signal.
Preferably, the input pin is connected to a switch button of the electric toothbrush.
Preferably, the linear change of the first vibration frequency includes that the vibration frequency is gradually increased and then gradually decreased with time.
Preferably, the linear change of the first duty cycle includes that the duty cycle is gradually increased and then gradually decreased with time.
Preferably, 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.
Preferably, the first MOS transistor and the third MOS transistor are P-channel field effect transistors.
Preferably, the second MOS transistor and the fourth MOS transistor are N-channel field effect transistors.
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; and according to a preset logic truth value rule, when the first pin and the second pin are 0 and the third pin and the fourth pin are 1, the first MOS tube is conducted, the second MOS tube is cut off, the third MOS tube is cut off, and the fourth MOS tube is conducted, and a power supply supplies power to the acoustic wave motor through the first MOS tube and the fourth MOS tube so as to enable the acoustic wave motor to be forward biased.
Preferably, when the first pin, the second pin, the third pin and the fourth pin are all 1, the first MOS tube and the third MOS tube are turned off, the second MOS tube and the fourth MOS tube are turned on, the current of the acoustic wave motor is freewheeling and gradually reduced through the second MOS tube and the fourth MOS tube, and the acoustic wave motor returns to the zero bias position.
The above 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 an acoustic wave motor, wherein the control circuit comprises: the device comprises a micro control unit, an H bridge unit and an acoustic wave motor, wherein the H bridge unit is connected with the micro control unit, the positive end of a power supply of the H bridge unit is connected with the positive end VCC of the power supply, the negative end of the power supply of the H bridge unit is grounded, the acoustic wave motor is further connected with the H bridge unit, and an alternating current square wave driving signal is provided for the acoustic wave motor through the H bridge unit. When the output states of the four pins of the micro control unit MCU are periodically switched between the state 1 and the state 2, the frequency of the micro control unit switching between the state 1 and the state 2 is made to be f. If f is fixed, the vibration frequency of the sound wave motor is also fixed; if f is linearly changed, the vibration frequency of the acoustic motor is also linearly changed. When f is gradually increased and then gradually decreased along with time, the voltage waveforms at the two ends of the acoustic wave motor can be obtained as shown in fig. 5. When the CTRL pin of the micro-control unit receives an input control signal, f starts to linearly change, and when the CTRL input control signal is received again, the micro-control unit enables f to stay at the frequency when the CTRL signal is received. The CTRL signal can be connected to the button switch of the brush, so that a user can conduct stepless frequency modulation by pressing the switch, the vibration frequency of the sound wave motor stays at the frequency wanted by the user, the technical problems that the mode of the alternating current driving signal of each gear of the electric toothbrush in the prior art cannot be adjusted randomly, or the electric toothbrush cannot be adjusted randomly in a mode preset by the electric toothbrush due to the fact that the user can only switch between the modes preset by the electric toothbrush, the frequency and/or the force of the electric toothbrush cannot be adjusted randomly in a plurality of modes are solved, the intelligent degree is high, the vibration frequency and the vibration force of the sound wave motor can be adjusted steplessly, and the user can select any wanted frequency point/force point.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Drawings
FIG. 1 is a schematic diagram of a control circuit for regulating vibration of an acoustic wave motor in accordance with an embodiment of the present invention;
FIG. 2 is a schematic diagram of another control circuit for adjusting the vibration of an acoustic wave motor according to an embodiment of the present invention;
FIG. 3 is a flow chart of a control method for adjusting vibration of an acoustic wave motor according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an AC square wave signal at two ends of an acoustic wave motor in a control method for adjusting vibration of the acoustic wave motor according to an embodiment of the present invention;
FIG. 5 is a basic waveform diagram of stepless frequency regulation of an acoustic wave motor according to an embodiment of the present invention;
FIG. 6 is another schematic diagram of an AC square wave signal at two ends of an acoustic wave motor in a control method for adjusting the vibration of the acoustic wave motor according to an embodiment of the present invention;
fig. 7 is a basic waveform diagram of stepless tuning force of an acoustic wave motor according to an embodiment of the present invention.
Reference numerals illustrate: the device comprises a first MOS tube 1, a second MOS tube 2, a third MOS tube 3, a fourth MOS tube 4, an acoustic 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 control method for adjusting vibration of an acoustic wave motor, which solve 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 strength of the electric toothbrush cannot be adjusted at will.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
In this embodiment, a control circuit for adjusting vibration of an acoustic wave motor is provided, where the control circuit is used to adjust frequency or force of the acoustic wave motor, and the control circuit is used to support, on hardware, a control method for adjusting vibration of the acoustic wave motor. It will be appreciated by those skilled in the art that in the present embodiment, the structure thereof is merely exemplary; that is, the circuit configuration can be replaced and modified according to the need of the adjusting motor, and the present embodiment is merely given as an example of a hardware support for realizing the adjusting method.
Fig. 1 is a schematic diagram of a control circuit for adjusting vibration of an acoustic wave motor according to an embodiment of the present invention, as shown in fig. 1, the control circuit includes: a micro control unit 6.
Specifically, the micro control unit 6 is a main control part of the control circuit, the english name of the micro control unit 6 is Micro controller Unit, called MCU for short, which is to properly reduce the frequency and specification of a Central Processing Unit (CPU), integrate peripheral interfaces such as a memory, a counter, a USB, an a/D conversion, UART, PLC, DMA, and the like, and even an LCD driving circuit on a single chip to form a chip-level computer, and perform different combination control for different application occasions. The micro control unit 6 in this embodiment is provided with a plurality of pins, namely a first pin IO1, a second pin IO2, a third pin IO3, and a fourth pin IO4, which can be connected with other elements through four output pins, and meanwhile, the micro control unit 6 further includes a fifth pin CTRL, where CTRL is an input pin of an external control signal.
The control circuit further includes: and the H bridge unit is connected with the micro control unit 6, the positive power end of the H bridge unit is connected with the positive power end VCC, and the negative power end of the H bridge unit is grounded.
Further, the H-bridge unit includes: the first MOS tube 1 is connected with a first pin of the micro control unit 6; the second MOS tube 2 is connected with a second pin of the micro control unit 6; the third MOS tube 3 is connected with a third pin of the micro control unit 6; and the fourth MOS tube 4 is connected with a fourth pin of the micro control unit 6. That is, the four MOS transistors are respectively controlled by four output pins (IO 1, IO2, IO3 and IO 4) of the MCU.
Further, the first MOS transistor 1 and the third MOS transistor 3 are P-channel field effect transistors.
Further, the second MOS transistor 2 and the fourth MOS transistor 4 are N-channel field effect transistors.
In particular, the H-bridge unit is connected to the micro-control unit 6 and is an electronic circuit that inverts the voltage/current across the load or output to which it is connected. Such circuits may be used for direct current motor control in various applications, forward and reverse direction control, speed control, stepper motor control (bipolar stepper motor must also include two H-bridge motor controllers), most of the direct current-to-alternating current converters (e.g., inverters and frequency converters), some of the direct current-to-direct current converters (push-pull converters), and other power electronics. The H-bridge unit in this embodiment includes a first MOS transistor 1, a third MOS transistor 3, a second MOS transistor 2, and a fourth MOS transistor 4, that is, an H-bridge is formed by the first MOS transistor 1, the third MOS transistor 3, the second MOS transistor 2, the fourth MOS transistor 4, and necessary connection lines therebetween, and an ac square wave driving signal is provided to the acoustic wave motor 5 by the H-bridge unit. The MOS transistor is a metal-oxide-semiconductor field effect transistor, or metal-insulator-semiconductor.
Further, the first MOS transistor 1 and the third MOS transistor 3 are P-channel field effect transistors (PMOS), and the second MOS transistor 2 and the fourth MOS transistor 4 are N-channel field effect transistors (NMOS), where the P-channel field effect transistors include a gate, a source, and a drain, and the gate is G (gate); source electrode S (source); the drain is D (drain). The power supply of the P-channel field effect transistor is generally connected with S and outputs D. The MOS tube formed by the p-type substrate and the two high-concentration N diffusion regions is called an N-channel field effect tube, and when the tube is conducted, an N-type conducting channel is formed between the two high-concentration N diffusion regions.
In this embodiment, further, one end of the first MOS tube 1 and one end of the third MOS tube 3 form a power supply positive terminal of the H-bridge unit and are connected with a power supply positive terminal VCC, where VCC is Volt Current Condenser, meaning that the power supply voltage of the circuit is the power supply positive terminal of the control circuit in this embodiment; one end of the second MOS tube 2 and one end of the fourth MOS tube 4 form a power supply negative end of the H-bridge unit and are connected with a ground end GND of the control circuit, where GND is shorthand of a wire ground end, that is, the ground of the control circuit in this embodiment.
In this embodiment, the control circuit further includes: and the sound wave motor 5 is connected with the H bridge unit, and an alternating-current square wave driving signal is provided for the sound wave motor 5 through the H bridge unit.
Specifically, the acoustic wave motor 5 is a driver using mechanical vibration in an ultrasonic frequency domain as a driving source, and in this embodiment, the acoustic wave motor 5 is connected to an H-bridge unit, and further an ac square wave driving signal is provided to the acoustic wave motor 5 through the H-bridge unit.
Further, in the control circuit, when the first pin IO1 and the third pin IO3 output a low level, the first MOS transistor and the third MOS transistor are turned on; when the second pin IO2 and the fourth pin IO4 output high levels, the second MOS tube and the fourth MOS tube are conducted.
According to the control logic truth value in table 1, when io1=io2=0 and io3=io4=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, so that the power supply supplies power to the acoustic wave motor 5 through the first MOS transistor and the fourth MOS transistor, and the motor is biased forward.
Table 1: true value of control logic
| State 1 | State 2 | State 3 | State 4 | |
| IO1 | 0 | 1 | 1 | 1 |
| IO2 | 0 | 1 | 1 | 0 |
| IO3 | 1 | 0 | 1 | 1 |
| IO4 | 1 | 0 | 1 | 0 |
| Motor state | Forward bias of | Reverse bias | Stall/slow homing | Stall/fast homing |
In the table, when io1=io2=io3=io4=1, the first MOS tube and the third MOS tube are turned off, the second MOS tube and the fourth MOS tube are turned on, the power supply does not supply power to the acoustic wave motor 5 at this time, the current of the acoustic wave motor 5 is continuously and gradually reduced through the second MOS tube and the fourth MOS tube, and the acoustic wave motor 5 slowly returns to the zero bias position.
As shown in the table above, when the acoustic wave motor 5 is forward biased in the state 1 and the acoustic wave motor 5 is reverse biased in the state 2, when the output states of the four pins of the micro control unit MCU are periodically switched between the state 1 and the state 2, an alternating current square wave signal with positive and negative alternation can be generated at the two ends of the acoustic wave motor 5, so that the acoustic wave motor 5 can vibrate back and forth. The frequency of the periodic switching between the state 1 and the state 2 is the frequency of the vibration of the acoustic wave motor 5.
The vibration force of the sonic motor 5 is positively correlated with the voltage effective value of the ac signal driving it. When the state of the output pin of the micro control unit 6 is switched back and forth between the state 1 and the state 2, the duty cycle of the control signal is 100% (i.e. the power supply is always supplying power); when a segment of state 3 is added between state 1 and state 2, the duty cycle of the control signal is less than 100% (the power supply is not powered in state 3). For example, as the foregoing 260Hz square wave, when the output pin of the micro-control unit 6 is periodically switched between the state 1, the state 3, the state 2 and the state 3, and stays at the state 1 for 0.962ms, then switches to the state 3 for 0.962ms, then switches to the state 2 for 0.962ms, and then switches to the state 3 for 0.962ms, at this time, the two ends of the motor generate an alternating current square wave signal with the duty ratio of 260 Hz/50%, as shown in fig. 6, it can be seen that the power supply does not supply power to the motor in the state 3, so that the waveform with the duty ratio of 50% has an effective value of only half of the waveform with the duty ratio of 100%. The waveform is used for driving the sound wave motor, so that the vibration force of the sound wave motor is obviously reduced. Duty cycle is the percentage of the total signal period that the signal is at a high level during a period.
Furthermore, the control circuit can also replace an H bridge consisting of 4 MOS tubes by using an integrated motor control chip 7, as shown in figure 2. The motor control chip 7 integrates an H bridge and control logic inside, and can output square wave signals which are the same as those of the control circuit through pin control of the MCU. The MCU can also adjust the frequency f and duty cycle d% of the square wave signal as well. The effect actually achieved is the same as that of the control circuit.
Example two
The embodiment provides a control method for adjusting vibration of an acoustic wave motor, and in particular, in the specific embodiment, the method comprises the following steps:
Fig. 3 is a schematic flow chart of a control method for adjusting vibration of an acoustic wave motor according to an embodiment of the present invention, as shown in fig. 3, where the method is used for controlling the aforementioned control circuit for adjusting vibration of an acoustic wave motor, and the control method includes:
step 110: a first alternating square wave signal of the sonic motor 5 is obtained.
Step 120: first vibration frequency or duty cycle information of the sonic motor 5 is obtained.
Specifically, as described above, the frequency at which the state 1 and the state 2 are periodically switched is the frequency at which the acoustic wave motor 5 vibrates. I.e. the sonic motor obtains a first vibration frequency. By switching the output pins of the micro control unit 6, alternating current square wave signals can be generated at two ends of the acoustic wave motor 5. As shown in fig. 4, when the output pin of the MCU is periodically switched between state 1 and state 2, stays for 1.923ms in state 1, and then stays for 1.923ms in state 2, an alternating square wave signal of 260Hz is generated at both ends of the motor. The frequency with which the micro control unit 6 switches between state 1 and state 2 is f. If f is fixed, the vibration frequency of the acoustic motor 5 is also fixed; if f is linearly varied, the vibration frequency of the acoustic wave motor 5 is also linearly varied. When f is gradually increased and then gradually decreased along with time, the voltage waveforms at the two ends of the acoustic wave motor can be obtained as shown in fig. 5.
The waveform and parameters of the square wave signal determine the working state of the acoustic wave motor, such as vibration frequency, force and the like, wherein the vibration frequency is related to the positive and negative waveform switching frequency of the square wave signal, and the duty ratio is related to the duty ratio setting of the square wave signal. In this step, the mode of acquisition may be obtained by the MCU according to an initial setting, that is, the first ac square wave signal corresponds to the current operating state of the motor, for example, the sonic motor may have different modes of brushing mode, cleaning mode, child mode, etc. according to a previous setting, and in different modes, the driving waveforms of the sonic motor are different; and in different modes, different driving waveforms based on the previously set frequency or dynamics are also different. And obtaining first alternating current square wave signals, first vibration frequency or duty ratio information through the MCU and taking the first alternating current square wave signals, the first vibration frequency or the duty ratio information as an initial value of adjustment so as to carry out subsequent adjustment operation.
Step 130: the fifth pin of the micro control unit 6 receives the first control signal inputted from the outside.
Step 140: and 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.
Specifically, the obtained voltage waveforms at two ends of the acoustic wave motor are the basis of stepless frequency modulation of the acoustic wave motor. Thus, when the fifth pin of the micro control unit 6, i.e. the CTRL pin, receives the input first control signal, f is caused to start to change linearly.
Step 150: a fifth pin of the micro control unit receives a second control signal input from the outside;
Step 160: and according to the second control signal, enabling the current frequency of the sound wave motor to stay on a second vibration frequency, wherein the second vibration frequency is the frequency when the micro control unit receives the second control signal.
In particular, when the fifth pin of the micro control unit 6, i.e. the CTRL pin, receives again the second control signal of the input of CTRL, the micro control unit 6 causes f to stay at the frequency at which the CTRL signal was received. The CTRL signal can be connected to the push-button switch of the brush so that the user can continuously frequency-modulate the vibration frequency of the sonic motor by pressing the switch to stay at the desired frequency.
Further, the control method further includes: obtaining a second alternating-current square wave signal of the acoustic wave motor 5; obtaining a first duty cycle of the second alternating current square wave signal; the fifth pin of the micro control unit 6 receives an externally input third control signal; according to the second alternating current square wave signal and the third control signal, the first duty ratio is adjusted so that the first duty ratio is linearly changed; the fifth pin of the micro control unit 6 receives a fourth control signal input from the outside; according to the fourth control signal, the current duty ratio of the second alternating current square wave signal stays on a second duty ratio, and the current vibration force of the acoustic wave motor 5 is obtained according to the second duty ratio, wherein the second duty ratio is a value when the micro control unit 6 receives the fourth control signal.
Specifically, the vibration force of the acoustic wave motor 5 is positively correlated with the voltage effective value of the ac signal driving it. When the state of the output pin of the micro control unit 6 is switched back and forth between the state 1 and the state 2, the duty cycle of the control signal is 100% (i.e. the power supply is always supplying power); when a segment of state 3 is added between state 1 and state 2, the duty cycle of the control signal is less than 100% (the power supply is not powered in state 3). For example, as the foregoing 260Hz square wave, when the output pin of the micro-control unit 6 is periodically switched between the state 1, the state 3, the state 2 and the state 3, and stays at the state 1 for 0.962ms, then switches to the state 3 for 0.962ms, then switches to the state 2 for 0.962ms, and then switches to the state 3 for 0.962ms, at this time, the two ends of the motor generate an alternating current square wave signal with the duty ratio of 260 Hz/50%, as shown in fig. 6, it can be seen that the power supply does not supply power to the motor in the state 3, so that the waveform with the duty ratio of 50% has an effective value of only half of the waveform with the duty ratio of 100%. The waveform is used for driving the sound wave motor, so that the vibration force of the sound wave motor is obviously reduced. Duty cycle is the percentage of the total signal period that the signal is at a high level during a period.
In order to ensure uniform vibration of the acoustic wave motor, the driving signals must be strictly symmetric in positive and negative directions, so that the duration of the state 1 and the duration of the state 2 in one period are strictly consistent, and the duration of the state 3 added to the two sides are strictly consistent. The frequency with which the micro control unit 6 switches between state 1 and state 2 is f. If f is fixed, the duty ratio of the state 1 and the state 2 in the same period is reduced, and the duty ratio of the state 3 is increased, the duty ratio of the alternating current square wave signal is reduced, and the vibration intensity of the motor is synchronously weakened. Let the sum of the durations of state 1 and state 2 in one period and the duty cycle of the period be d%, then d% is the duty cycle of the square wave signal. When f is unchanged and d% is gradually reduced and then gradually increased along with time, the obtained waveform is shown in fig. 7, and the waveform is the basis of stepless tuning force of the acoustic wave motor.
Thus, when the CTRL pin of the micro-control unit 6 receives the third control signal of the input, d% is caused to start to change linearly, and when the fourth control signal of the input of CTRL is received again, the micro-control unit 6 causes d% to stay at the value when the CTRL signal is received. The CTRL signal can be connected to a push button switch of the brush, so that the user can continuously adjust the force by pressing the switch, and the vibration force of the acoustic wave motor is maintained at a desired value.
Therefore, in this embodiment, the control method for continuously adjusting the vibration frequency and the vibration force of the acoustic wave motor is realized by continuously and linearly increasing/decreasing the frequency/voltage effective value of the driving signal of the acoustic wave motor, and the method is a control circuit logic algorithm. By the control method, when the electric toothbrush works, a user can stop the sound wave motor of the electric brush at any frequency point/force point which is wanted by the user. Further, the technical basis of the algorithm is as follows: due to the characteristics of the acoustic wave motor, when a forward voltage drop is applied to the two ends of the acoustic wave motor, the motor can deflect forward; when a negative voltage drop is applied across it, the motor will deflect in the negative direction. A regular ac signal (typically a square wave) with an average voltage of 0V allows the sonic motor to oscillate back and forth. The vibration frequency of the sound wave motor is the frequency of the alternating current signal, and the vibration force of the sound wave motor is positively correlated with the voltage effective value of the alternating current signal. So increasing the frequency of the alternating current signal, the vibration frequency of the acoustic motor is synchronously increased; the vibration power of the acoustic motor is increased synchronously by increasing the voltage effective value of the alternating current signal.
The duty ratio or the frequency can be adjusted through the change along with the time, so that a user only needs to press the switch key for a long time when operating, and the working state of the motor is adjusted according to the time length of the switch key, namely, in the patent, stepless speed regulation and force regulation can be realized by only one key. The user is prevented from operating a plurality of keys on a limited handle, so that the user can adjust the strength and sense whether the strength is proper or not through the oral cavity when brushing teeth.
In the embodiment, the frequency and the duty ratio of the alternating current square wave signal for driving the sound wave motor are linearly adjusted to realize the stepless adjustment method of the vibration frequency and the vibration force of the sound wave motor, and meanwhile, the vibration frequency and the vibration force of the sound wave motor can be stopped at the frequency point/force point wanted by a user in response to the control of the user, so that the stepless adjustment of the vibration frequency and the vibration force of the sound wave motor is realized, and the user can select any wanted frequency point/force point without being limited to the preset frequency point/force point.
The above 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 an acoustic wave motor, wherein the control circuit comprises: the device comprises a micro control unit, an H bridge unit and an acoustic wave motor, wherein the H bridge unit is connected with the micro control unit, the positive end of a power supply of the H bridge unit is connected with the positive end VCC of the power supply, the negative end of the power supply of the H bridge unit is grounded, the acoustic wave motor is further connected with the H bridge unit, and an alternating current square wave driving signal is provided for the acoustic wave motor through the H bridge unit. When the output states of the four pins of the micro control unit MCU are periodically switched between the state 1 and the state 2, the frequency of the micro control unit switching between the state 1 and the state 2 is made to be f. If f is fixed, the vibration frequency of the sound wave motor is also fixed; if f is linearly changed, the vibration frequency of the acoustic motor is also linearly changed. When f is gradually increased and then gradually decreased along with time, the voltage waveforms at the two ends of the acoustic wave motor can be obtained. When the CTRL pin of the micro-control unit receives an input control signal, f starts to linearly change, and when the CTRL input control signal is received again, the micro-control unit enables f to stay at the frequency when the CTRL signal is received. The CTRL signal can be connected to the button switch of the electric brush, so that a user can conduct stepless frequency modulation by pressing the switch, the vibration frequency of the sound wave motor stays at the frequency wanted by the user, the technical problems that the mode of the alternating current driving signal of each gear of the electric toothbrush in the prior art can not be randomly adjusted, the user can only switch between preset modes of the electric toothbrush and can not randomly adjust the frequency and/or the force of the electric toothbrush are solved, the intelligent degree is high, the vibration frequency and the vibration force of the sound wave motor can be infinitely adjusted, and the user can select any wanted frequency point/force point.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims and the equivalents thereof, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A control method for adjusting vibration of an acoustic wave motor by controlling a control circuit for adjusting vibration of an acoustic wave motor, the control circuit comprising:
A micro control unit; the H bridge unit is connected with the micro control unit, the positive power end of the H bridge unit is connected with the positive power end VCC, and the negative power end of the H bridge unit is grounded; the sound wave motor is connected with the H bridge unit, and an alternating-current square wave driving signal is provided for the sound wave motor through the H bridge unit;
The control method is characterized by comprising the following steps:
Obtaining a first alternating current square wave signal and a first vibration frequency of an acoustic wave motor;
An input pin of the micro control unit receives a first control signal input from the outside; according to the first alternating current square wave signal and the first control signal, adjusting the vibration frequency to enable the vibration frequency to change linearly;
The input pin of the micro control unit receives a second control signal input from the outside; according to the second control signal, the vibration frequency of the sound wave motor is kept at a second vibration frequency; the second vibration frequency is the vibration frequency when the micro control unit receives the second control signal.
2. A control method for adjusting the vibration of an acoustic wave motor according to claim 1 wherein said first vibration frequency is linearly varied by gradually increasing and then gradually decreasing said vibration frequency over time.
3. A control method for adjusting the vibration of an acoustic wave motor, by a control circuit for adjusting the vibration of an acoustic wave motor, the control circuit comprising:
A micro control unit; the H bridge unit is connected with the micro control unit, the positive power end of the H bridge unit is connected with the positive power end VCC, and the negative power end of the H bridge unit is grounded; the sound wave motor is connected with the H bridge unit, and an alternating-current square wave driving signal is provided for the sound wave motor through the H bridge unit;
The control method is characterized by comprising the following steps:
obtaining a first alternating current square wave signal and a first duty ratio of the acoustic wave motor;
An input pin of the micro control unit receives a first control signal input from the outside; according to the first alternating current square wave signal and the first control signal, the first duty ratio is adjusted so that the first duty ratio is linearly changed;
The input pin of the micro control unit receives a second control signal input from the outside; and according to the second control signal, the duty ratio of the driving waveform of the acoustic wave motor is kept at a second duty ratio, wherein the second duty ratio is the duty ratio when the micro control unit receives the second control signal.
4. A control method for regulating the vibration of an acoustic wave motor according to claim 3 wherein said first duty cycle is varied linearly comprising said duty cycle increasing gradually over time and then decreasing gradually.
5. A control method for adjusting the vibration of an acoustic wave motor according to claim 1 or 3, characterized in that the input pin is connected to a switch button of an electric toothbrush.
6. A control method for adjusting vibration of an acoustic wave motor according to claim 1 or 3, 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.
7. The control method for adjusting vibration of an acoustic wave motor according to claim 6, wherein the first MOS transistor and the third MOS transistor are P-channel field effect transistors.
8. The control method for adjusting vibration of an acoustic wave motor according to claim 7, wherein the second MOS transistor and the fourth MOS transistor are N-channel field effect transistors.
9. The control method of claim 8, wherein 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; and according to a preset logic truth value rule, when the first pin and the second pin are 0 and the third pin and the fourth pin are 1, the first MOS tube is conducted, the second MOS tube is cut off, the third MOS tube is cut off, and the fourth MOS tube is conducted, and a power supply supplies power to the acoustic wave motor through the first MOS tube and the fourth MOS tube so as to enable the acoustic wave motor to be forward biased.
10. The control method of claim 9, wherein 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 is freewheeled and gradually reduced through the second MOS transistor and the fourth MOS transistor, and the acoustic wave motor returns to a zero bias position.
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| CN201910966968.2A CN110601634A (en) | 2019-10-12 | 2019-10-12 | Control circuit and method for adjusting vibration of sound wave motor |
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| CN202021228101.1U Active CN212163195U (en) | 2019-10-12 | 2020-06-29 | Control circuit for adjusting vibration of sound wave motor |
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| CN111568584A (en) * | 2020-05-14 | 2020-08-25 | 无锡青禾小贝科技有限公司 | Control method and device based on vibration strength of toothbrush motor |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4403176A (en) * | 1978-05-08 | 1983-09-06 | California Technics, Ltd. | Circuit for driving an ultrasonic dental tool at its resonant frequency |
| JPH07177932A (en) * | 1993-12-22 | 1995-07-18 | Matsushita Electric Works Ltd | Motor-driven toothbrush |
| JP2004350443A (en) * | 2003-05-23 | 2004-12-09 | Hitachi Constr Mach Co Ltd | Electric construction machine |
| CN101716099A (en) * | 2009-12-22 | 2010-06-02 | 上海大学 | Pressure sensitive electric toothbrush vibration frequency adjusting system |
| CN212163195U (en) * | 2019-10-12 | 2020-12-15 | 无锡青禾小贝科技有限公司 | Control circuit for adjusting vibration of sound wave motor |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1834605A1 (en) * | 2006-03-17 | 2007-09-19 | Trisa Holding AG | Electrically driven, continuously adjustable body care device |
| US9912278B2 (en) * | 2015-08-28 | 2018-03-06 | Semiconductor Components Industries, Llc | Method of forming a semiconductor device and structure therefor |
-
2019
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-
2020
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4403176A (en) * | 1978-05-08 | 1983-09-06 | California Technics, Ltd. | Circuit for driving an ultrasonic dental tool at its resonant frequency |
| JPH07177932A (en) * | 1993-12-22 | 1995-07-18 | Matsushita Electric Works Ltd | Motor-driven toothbrush |
| JP2004350443A (en) * | 2003-05-23 | 2004-12-09 | Hitachi Constr Mach Co Ltd | Electric construction machine |
| CN101716099A (en) * | 2009-12-22 | 2010-06-02 | 上海大学 | Pressure sensitive electric toothbrush vibration frequency adjusting system |
| CN212163195U (en) * | 2019-10-12 | 2020-12-15 | 无锡青禾小贝科技有限公司 | Control circuit for adjusting vibration of sound wave motor |
Non-Patent Citations (1)
| Title |
|---|
| 基于PLC的直流伺服电机定占空比调频调速;王平等;电气传动;20120720;第42卷(第7期);第73-76页 * |
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| CN112217442A (en) | 2021-01-12 |
| CN212163195U (en) | 2020-12-15 |
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