WO2020147307A1 - 电动牙刷驱动频率控制方法及其控制系统 - Google Patents

电动牙刷驱动频率控制方法及其控制系统 Download PDF

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Publication number
WO2020147307A1
WO2020147307A1 PCT/CN2019/100640 CN2019100640W WO2020147307A1 WO 2020147307 A1 WO2020147307 A1 WO 2020147307A1 CN 2019100640 W CN2019100640 W CN 2019100640W WO 2020147307 A1 WO2020147307 A1 WO 2020147307A1
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Prior art keywords
frequency
drive
driving
electric toothbrush
module
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PCT/CN2019/100640
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English (en)
French (fr)
Inventor
赵立群
刘明
陈建群
吕少波
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广州皓醒湾科技有限公司
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Publication of WO2020147307A1 publication Critical patent/WO2020147307A1/zh

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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
    • A61C17/221—Control arrangements therefor
    • 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
    • A61C17/24—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like rotating continuously
    • A61C17/26—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like rotating continuously 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
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors

Definitions

  • This application relates to the field of electric toothbrushes, and more specifically, to a method for controlling the driving frequency of an electric toothbrush and its control system.
  • the driving method of the existing electric toothbrush is generally that the microprocessor outputs the driving frequency to drive the wave to the driving motor, thereby driving the motor to rotate.
  • the brush head of the electric toothbrush is driven to rotate or vibrate.
  • the brush head of the existing electric toothbrush is generally made Reciprocating periodic motion, the motor has a natural frequency of reciprocating periodic motion, but the model of the brush head of the electric toothbrush, the tolerance of the motor assembly, etc.
  • One of the objectives of the present application is to provide a method for controlling the driving frequency of an electric toothbrush and a control system thereof.
  • the method and control system can make the driving frequency output by the microprocessor consistent with the natural frequency output by the motor, so as to maximize the electric toothbrush. Excellent working condition.
  • the present application provides a method for controlling the driving frequency of an electric toothbrush, which is applied to an electric toothbrush driving frequency control system including a microprocessor module, a driving motor, and a current detection module.
  • the method includes the following steps:
  • the microprocessor module adjusts its output drive frequency according to the current of the drive motor detected by the current detection module, so that the drive frequency is consistent with the natural frequency of the drive motor.
  • the microprocessor module adjusts its output drive frequency according to the current of the drive motor detected by the current detection module, including:
  • the microprocessor module detects whether the value of the derivative of the current value collected by the current collecting module and the driving frequency of the microprocessor module is greater than a preset threshold
  • the microprocessor module drives the driving motor to work at a driving frequency
  • the microprocessor module adjusts its output driving frequency until the value of the derivative is not higher than the preset threshold, and uses the adjusted driving frequency Drive the driving motor to work.
  • the method further includes:
  • the microprocessor records the adjusted driving frequency
  • the microprocessor When the microprocessor detects that the electric toothbrush is suspended and restarted, it drives the driving motor to operate at the adjusted driving frequency recorded before the suspension of the electric toothbrush.
  • step C it further includes:
  • the current detection module converts the current of the driving motor into voltage and outputs it to the microprocessor module
  • the microprocessor module detects the voltage value output by the current detection module, and calculates the current value according to the voltage value, where the current value is the first current value;
  • the microprocessor module adjusts its output drive frequency according to the first current value.
  • the microprocessor module adjusts its output drive frequency according to the first current value, including:
  • the microprocessor module judges whether the derivative of the first current value and the driving frequency of the microprocessor module is 0;
  • the microprocessor module drives the driving motor to rotate at the driving frequency
  • the microprocessor module adjusts its output driving frequency until the derivative of the driving frequency and the first current value is 0, and drives the driving motor to rotate at the adjusted driving frequency.
  • step A it further includes:
  • the microprocessor module outputs the drive wave of the drive frequency to the drive motor control module of the drive motor;
  • the drive motor control module drives the motor to rotate according to the received drive wave of the drive frequency.
  • the manner in which the drive motor control module drives the motor to rotate according to the received drive wave of the drive frequency includes:
  • the drive motor control module adjusts the current size or the current duty ratio of the drive motor according to the received drive frequency, so as to control the rotation speed or the rotation frequency of the drive motor.
  • the microprocessor module drives the driving motor at the driving frequency of the previous electric toothbrush suspension.
  • this application provides a drive frequency control system for an electric toothbrush, including a microprocessor module, a drive motor control module, a drive motor, and a current detection module; the microprocessor module is connected to the drive motor control module, and the The microprocessor module is configured to output the drive wave of the drive frequency to the drive motor control module;
  • the driving motor control module is configured to drive the driving motor to rotate after receiving the driving wave of the driving frequency output by the microprocessor;
  • the driving electric mechanism causes the electric toothbrush head to be driven to rotate
  • the input end of the current detection module is connected to the drive motor, and the output end is connected to the microprocessor module.
  • the current detection module is configured to detect the current of the drive motor, and convert the drive current into a drive voltage to output to Microprocessor module.
  • the microprocessor module is specifically configured to detect whether the value of the derivative of the current value collected by the current collecting module and the driving frequency of the microprocessor module is greater than a predetermined value. Set a threshold; if the value of the derivative is not higher than the preset threshold, the microprocessor module drives the driving motor at the driving frequency; if the value of the derivative is higher than the preset threshold, then The microprocessor module adjusts its output driving frequency until the value of the derivative is not higher than the preset threshold, and drives the driving motor to work at the adjusted driving frequency.
  • the microprocessor is further configured to record the adjusted drive frequency; when the microprocessor detects that the electric toothbrush is suspended and restarted, The driving motor is driven to operate at the adjusted driving frequency recorded before the electric toothbrush is suspended.
  • the microprocessor module is configured to adjust its output drive frequency according to the voltage output by the current detection module.
  • the current detection module includes a first resistor R1, a second resistor R2, a third resistor R3 and an operational amplifier, and one end of the first resistor R1 is connected to a driving motor , The other end of the first resistor R1 is connected to the second resistor R2, the other end of the second resistor R2 is respectively connected to one end of the third resistor R3 and the forward end of the operational amplifier, and the reverse end of the operational amplifier is connected to The drive motor is connected, and the other end of the third resistor R3 and the output end of the operational amplifier are connected to the microprocessor module.
  • the microprocessor module is a single-chip microcomputer.
  • an A/D interface is provided on the single-chip microcomputer.
  • the driving frequency control method and control system of the electric toothbrush provided by the present application detect the working current of the driving motor in real time when the electric toothbrush is working, and adjust the working frequency of the driving motor in real time according to the working current, so that the working frequency of the driving motor approaches In order to drive the natural frequency of the motor, the electric toothbrush can achieve the optimal resonance working state, which can reduce the power consumption and noise of the surge pressure toothbrush, and give customers a better tooth brushing experience.
  • Fig. 1 is a graph of driving frequency and current of an embodiment of the present application
  • Figure 2 is a general flow chart of a method for controlling the driving frequency of an electric toothbrush according to an embodiment of the present application
  • Fig. 3 is a schematic diagram of a driving frequency control system of an electric toothbrush according to an embodiment of the present application
  • FIG. 4 is a schematic diagram of a current detection module according to an embodiment of the present application.
  • Microprocessor module 100.
  • drive motor control module 300, drive motor; 400, current detection module.
  • the microprocessor module 100 of the electric toothbrush When the electric toothbrush is running, the microprocessor module 100 of the electric toothbrush outputs the driving frequency to the driving motor 300.
  • the natural frequency of the reciprocating motion of the driving motor 300 drives the brush head of the electric toothbrush to rotate, but the natural frequency of the driving motor 300 is affected by the motor. Due to the influence of the fit tolerance and other reasons, the natural frequency of the driving motor 300 is usually in a constantly changing dynamic state.
  • FIG. 1 shows a graph of the current I of the driving motor 300 varying with the driving frequency F output by the microprocessor module 100 of the electric toothbrush.
  • step S20 of this embodiment the microprocessor module 100 may output a preset fixed frequency to drive the motor 300 to rotate according to the preset fixed frequency first.
  • S40 Adjust the output drive frequency of the drive motor 300 by the microprocessor module 100 according to the current of the drive motor 300 detected by the current detection module 400, so that the drive frequency is consistent with the natural frequency of the drive motor 300.
  • the microprocessor module 100 may detect whether the value of the derivative of the current value collected by the current collecting module 400 and the driving frequency of the microprocessor module 100 is greater than the predetermined value.
  • the threshold may be the absolute value of the derivative.
  • the value of the derivative is not higher than the preset threshold, it means that the current drive frequency currently output by the microprocessor module 100 is closer to the natural frequency of the drive motor 300, and the microprocessor module 100 uses this The driving frequency drives the driving motor to work.
  • the value of the derivative is higher than the preset threshold, it means that the current driving frequency currently output by the microprocessor module 100 has a large gap with the natural frequency of the driving motor 300, and the microprocessor module 100 adjusts The output driving frequency until the value of the derivative is not higher than the preset threshold value, and the driving motor 300 is driven to work at the adjusted driving frequency.
  • step S30 it further includes:
  • the current detection module 400 converts the current of the driving motor 300 into a voltage and outputs it to the microprocessor module 100;
  • the microprocessor module 100 detects the voltage value output by the current detection module 400, and calculates the current value according to the voltage value, where the current value is the first current value;
  • the microprocessor module 100 adjusts its output driving frequency according to the first current value
  • the microprocessor module 100 adjusts its output driving frequency according to the first current value, including:
  • the microprocessor module 100 determines whether the derivative of the first current value and the driving frequency of the microprocessor module 100 is zero.
  • the microprocessor module 100 drives the driving motor 300 to rotate at the driving frequency.
  • the microprocessor module 100 adjusts its output driving frequency until the derivative of the driving frequency and the first current value is 0, and drives the driving motor 300 to rotate at the adjusted driving frequency.
  • step S10 it further includes:
  • the microprocessor module 100 outputs the driving wave of the driving frequency to the driving motor control module of the driving motor 300.
  • the drive motor control module drives the motor 300 to rotate according to the received drive wave of the drive frequency.
  • the drive motor 300 can be connected to a drive motor control module, and the drive motor control module can receive a control signal sent by the microprocessor module 100.
  • the control signal is the drive frequency, and the drive motor control module can drive according to the drive frequency.
  • the frequency controls the rotation frequency or speed of the driving motor 300.
  • the driving motor control module can control the rotation frequency or speed of the driving motor 300 by controlling the magnitude of the current output to the driving motor or the duty ratio of the current.
  • the microprocessor module 100 may record the adjusted driving frequency, and the microprocessor module 100 may detect that the electric toothbrush is suspended and restarted, The driving motor is driven to operate at the adjusted driving frequency recorded before the electric toothbrush is suspended.
  • the microprocessor module 100 drives the driving motor 300 at the driving frequency of the last electric toothbrush suspension.
  • the present application also discloses a driving frequency control system of an electric toothbrush, which includes a microprocessor module 100, a driving motor control module 200, a driving motor 300 and a current detection module 400.
  • the microprocessor module 100 is connected to the driving motor control module 200, and the microprocessor module 100 outputs the driving wave of the driving frequency to the driving motor control module 200.
  • the driving motor control module 200 is configured to drive the driving motor 300 to rotate after receiving the driving wave of the driving frequency output by the microprocessor.
  • the driving motor 300 is configured to drive the electric toothbrush head to rotate.
  • the input end of the current detection module 400 is connected to the drive motor 300, and the output end is connected to the microprocessor module 100.
  • the current detection module 400 detects the current of the drive motor 300 and converts the drive current into a drive voltage output To the microprocessor module 100.
  • the microprocessor module 100 may adjust its output driving frequency according to the voltage output by the current detection module 400.
  • the microprocessor module 100 may be a circuit or a chip that has the ability to receive information and perform logical judgment and processing on the information.
  • the microprocessor module 100 of this embodiment may be a single-chip microcomputer, and an A/D interface is provided on the single-chip microcomputer.
  • the current detection module 400 of this embodiment includes a first resistor R1, a second resistor R2, a third resistor R3, and an operational amplifier, and one end of the first resistor R1 is connected to the driving motor 300 , The other end of the first resistor R1 is connected to the second resistor R2, the other end of the second resistor R2 is respectively connected to one end of the third resistor R3 and the forward end of the operational amplifier, and the reverse end of the operational amplifier is connected to The driving motor 300 is connected, and the other end of the third resistor R3 and the output end of the operational amplifier are connected to the microprocessor module 100.
  • the electric toothbrush When the electric toothbrush is running, the current of the drive motor 300 is detected in real time, and the drive frequency of the microprocessor module 100 is adjusted in real time according to the current, so that the drive frequency of the microprocessor module 100 is consistent with the natural frequency of the drive motor 300. When the frequency is consistent with the natural frequency, the electric toothbrush reaches the optimal working state. At this time, the electric toothbrush has low power consumption, low noise, and low vibration, which can bring customers a better tooth brushing experience.
  • the natural frequency of the drive motor 300 is constantly changing during the operation of the drive motor 300.
  • the drive frequency of the microprocessor module 100 and the drive motor 300 By detecting the current of the driving motor 300, the driving frequency of the microprocessor module 100 can be adjusted according to the current of the driving motor 300, and the adjustment method is simple and accurate.
  • the current detection module 400 is connected to the drive motor 300 and the microcontroller module 100, so that the microprocessor module 100 and the drive motor 300 realize closed-loop control, and achieve the resonance of the drive frequency of the microprocessor module 100 and the natural frequency of the reciprocating motion of the drive motor 300 Effect.
  • the driving frequency control method and control system of the electric toothbrush detect the working current of the driving motor in real time when the electric toothbrush is working, and adjust the working frequency of the driving motor in real time according to the working current, so that the working frequency of the driving motor approaches that of the driving motor. Natural frequency, so that the electric toothbrush can reach the optimal resonance working state, can reduce the power consumption and noise of the surge pressure toothbrush, and give customers a better tooth brushing experience.

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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)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Brushes (AREA)
  • Control Of Direct Current Motors (AREA)

Abstract

一种电动牙刷驱动频率控制方法及其控制系统，其中的控制方法包括以下步骤：A、启动电动牙刷(S10)；B、电动牙刷的驱动电机(300)以固有频率转动(S20)；C、电流检测模块(400)实时检测驱动电机(300)的电流(S30)；D、微处理器模块(100)根据电流检测模块(400)检测到的驱动电机(300)的电流调节其输出的驱动频率，使驱动频率与驱动电机(300)的固有频率一致(S40)。通过使微处理器输出的驱动频率与电机输出的固有频率一致，从而使得电动牙刷达到最优的工作状态。

Description

电动牙刷驱动频率控制方法及其控制系统
相关申请的交叉引用
本申请要求于2019年01月18日提交中国专利局的申请号为201910047373.7、名称为“电动牙刷驱动频率控制方法及其控制系统”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及电动牙刷领域，更具体的说，涉及一种电动牙刷驱动频率控制方法及其控制系统。
背景技术
现有的电动牙刷，其驱动方式一般为微处理器输出驱动频率驱动波至驱动电机，从而驱动电机转动，电机转动时带动电动牙刷刷头转动或振动，现有的电动牙刷的刷头一般做往复的周期性运动，电机存在往复周期运动的固有频率，但是电动牙刷的刷头的型号、电机装配的公差等都会影响电机的固有频率，使电机的固有频率在刷牙的过程中会不断发生变化，而当微处理器输出的固有频率与电机输出的固有频率一致时，电动牙刷才会达到最优的工作状态，而在电机输出的固有频率变化的过程中，微处理器输出的驱动频率并不会随着变化，从而导致电动牙刷达不到最优的工作状态。
发明内容
本申请的目的之一在于提供一种电动牙刷驱动频率控制方法及其控制系统，该控制方法及控制系统可使微处理器输出的驱动频率与电机输出的固有频率一致，可以使电动牙刷达到最优的工作状态。
第一方面，本申请提供一种电动牙刷驱动频率控制方法，应用于包括微处理器模块、驱动电机及电流检测模块的电动牙刷驱动频率控制系统，所述方法包括以下步骤：
A、启动电动牙刷；
B、使所述电动牙刷的驱动电机以固定频率转动；
C、通过所述电流检测模块实时检测所述驱动电机的电流；
D、通过所述微处理器模块根据所述电流检测模块检测到的驱动电机的电流调节其输出的驱动频率，以使所述驱动频率与所述驱动电机的固有频率一致。
可选地，在上述方法中，微处理器模块根据所述电流检测模块检测到的驱动电机的电流调节其输出的驱动频率，包括：
微处理器模块检测所述电流采集模块采集的电流值与所述微处理器模块的驱动频率的导数的值是否大于预设阈值；
若所述导数的值不高于所述预设阈值，则所述微处理器模块以驱动频率驱动所述驱动电机工作；
若所述导数的值高于所述预设阈值，则所述微处理器模块调整其输出的驱动频率，直至所述导数的值不高于所述预设阈值，并以调节后的驱动频率驱动所述驱动电机工作。
可选地，在上述方法中，所述方法还包括：
所述微处理器记录调节后的驱动频率；
所述微处理器在检测到所述电动牙刷暂停工作并重新启动时，以暂停在电动牙刷暂停工作前记录的所述调节后的驱动频率驱动所述驱动电机工作。
可选地，在上述方法中，在步骤C之后，还包括：
电流检测模块将驱动电机的电流转换成电压输出至微处理器模块；
微处理器模块检测电流检测模块输出的电压值，并根据电压值计算出电流值，所述电流值为第一电流值；
微处理器模块根据第一电流值调节其输出的驱动频率。
可选地，在上述方法中，微处理器模块根据第一电流值调节其输出的驱动频率，包括：
微处理器模块判断所述第一电流值与所述微处理器模块的驱动频率的导数是否为0；
若导数为0，则微处理器模块以驱动频率驱动所述驱动电机转动；
若导数不为0，则微处理器模块调整其输出的驱动频率，直至驱动频率与第一电流值的导数为0，并以调节后的驱动频率驱动所述驱动电机转动。
可选地，在上述方法中，在步骤A后，还包括：
微处理器模块输出驱动频率的驱动波至驱动电机的驱动电机控制模块；
驱动电机控制模块根据接收的驱动频率的驱动波驱动电机转动。
可选地，在上述方法中，所述驱动电机控制模块根据接收的驱动频率的驱动波驱动电机转动的方式包括：
所述驱动电机控制模块根据接收到的所述驱动频率调整所述驱动电机的电流大小或电流占空比大小，从而控制所述驱动电机的转速或转动频率。
可选地，在上述方法中，在电动牙刷暂停重新启动后，所述微处理器模块以上一次电动牙刷暂停时的驱动频率驱动所述驱动电机。
第二方面，本申请提供了一种电动牙刷驱动频率控制系统，包括微处理器模块、驱动电机控制模块、驱动电机及电流检测模块；所述微处理器模块与驱动电机控制模块相连，所述微处理器模块配置成输出驱动频率的驱动波至驱动电机控制模块；
所述驱动电机控制模块构造成接收微处理器输出的驱动频率的驱动波后，驱动所述驱动电机转动；
所述驱动电机构造成驱动电动牙刷头转动；
所述电流检测模块其输入端与驱动电机相连，其输出端与微处理器模块相连，所述电流检测模块构造成检测所述驱动电机的电流，并将所述驱动电流转换成驱动电压输出至微处理器模块。
可选地，在上述电动牙刷驱动频率控制系统中，所述微处理器模块具体配置成检测所述电流采集模块采集的电流值与所述微处理器模块的驱动频率的导数的值是否大于预设阈值；若所述导数的值不高于所述预设阈值，则所述微处理器模块以驱动频率驱动所述驱动电机工作；若所述导数的值高于所述预设阈值，则所述微处理器模块调整其输出的驱动频率，直至所述导数的值不高于所述预设阈值，并以调节后的驱动频率驱动所述驱动电机工作。
可选地，在上述电动牙刷驱动频率控制系统中，所述微处理器还配置成记录所述调节后的驱动频率；所述微处理器在检测到所述电动牙刷暂停工作并重新启动时，以暂停在电动牙刷暂停工作前记录的所述调节后的驱动频率驱动所述驱动电机工作。
可选地，在上述电动牙刷驱动频率控制系统中，所述微处理器模块配置成根据所述电流检测模块输出的电压调节其输出的驱动频率。
可选地，在上述电动牙刷驱动频率控制系统中，所述电流检测模块包括第一电阻R1、第二电阻R2、第三电阻R3及运放，所述第一电阻R1的一端与驱动电机相连，所述第一电阻R1的另一端与第二电阻R2相连，所述第二电阻R2的另一端分别与第三电阻R3的一端及运放的正向端相连，运放的反向端与驱动电机相连，第三电阻R3的另一端及运放的输出端与微处理器模块相连。
可选地，在上述电动牙刷驱动频率控制系统中，所述微处理器模块为单片机。
可选地，在上述电动牙刷驱动频率控制系统中，所述单片机上设有A/D接口。
本申请提供的方案至少包括以下有益效果：
本申请提供的电动牙刷驱动频率控制方法及其控制系统，通过在电动牙刷工作时实时检测驱动电机的工作电流，并根据该工作电流实时调整驱动电机的工作频率，使驱动电机的工作频率趋近于驱动电机的固有频率，从而使电动牙刷达到最优的谐振工作状态，可以降低电涌压牙刷的功耗、噪声，给客户更好的刷牙体验。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，应当理解，以下附图仅示出了本申请的某些实施例，因此不应被看作是对范围的限定，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他相关的附图。
图1是本申请实施例的驱动频率与电流曲线图；
图2是本申请实施例的电动牙刷驱动频率控制方法的总的流程图；
图3是本申请实施例的电动牙刷驱动频率控制系统的示意图；
图4是本申请实施例的电流检测模块的示意图；
附图标记说明：
100、微处理器模块；200、驱动电机控制模块；300、驱动电机；400、电流检测模块。
具体实施方式
为使本申请实施例的目的、技术方案和优点更加清楚，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。通常在此处附图中描述和示出的本申请实施例的组件可以以各种不同的配置来布置和设计。
因此，以下对在附图中提供的本申请的实施例的详细描述并非旨在限制要求保护的本申请的范围，而是仅仅表示本申请的选定实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
应注意到：相似的标号和字母在下面的附图中表示类似项，因此，一旦某一项在一个附图中被定义，则在随后的附图中不需要对其进行进一步定义和解释。
在本申请的描述中，需要说明的是，术语“第一”、“第二”、“第三”等仅用于区分描述，而不能理解为指示或暗示相对重要性。
下面对本申请的实施例进行详细说明。
电动牙刷在运行时，由电动牙刷的微处理器模块100输出驱动频率至驱动电机300，驱动电机300以往复运动的固有频率驱动电动牙刷刷头转动，但是驱动电机300的固有频率由于受电机马达配合公差等原因的影响，驱动电机300的固有频率通常处于不断变化的动态状态。请参照图1，图1示出了驱动电机300的电流I随电动牙刷的微处理器模块100输出的驱动频率F变化的曲线图。如图1所示，在电动牙刷的刷头震动幅度不变的情况下，电动牙刷的微处理器模块100的驱动频率F与驱动电机300的固有频率f接近或一致时，电动牙刷的驱动电机300的电流I会急剧下降，由图1可知，当微处理器模块100的驱动频率与电流的导数为0或接近于0时，微处理器模块100的驱动频率与驱动电机300的固有频率基本一致，基于以上原理，如图2所示，本实施例公开一种电动牙刷驱动频率控制方法，该控制方法包括以下步骤：
S10、启动电动牙刷。
S20、使电动牙刷的驱动电机300以固定频率转动。
在本实施例步骤S20中，可以由微处理器模块100输出预设的固定频率，以驱动电机 300先按照该预设的固定频率转动。
S30、通过电流检测模块400实时检测驱动电机300的电流。
S40、通过微处理器模块100根据所述电流检测模块400检测到的驱动电机300的电流调节其输出的驱动频率，以使所述驱动频率与所述驱动电机300的固有频率一致。
可选地，在本实施例中，在步骤S40中，微处理器模块100可以检测所述电流采集模块400采集的电流值与所述微处理器模块100的驱动频率的导数的值是否大于预设阈值。其中，所述导数的值可以为导数的绝对值。
若所述导数的值不高于所述预设阈值，表示当前所述微处理器模块100当前输出的驱动频率较为接近所述驱动电机300的固有频率，则所述微处理器模块100以该驱动频率驱动所述驱动电机工作。
若所述导数的值高于所述预设阈值，表示当前所述微处理器模块100当前输出的驱动频率与所述驱动电机300的固有频率差距较大，则所述微处理器模块100调整其输出的驱动频率，直至所述导数的值不高于所述预设阈值，并以调节后的驱动频率驱动所述驱动电机300工作。
例如，在步骤S30之后，还包括：
电流检测模块400将驱动电机300的电流转换成电压输出至微处理器模块100；
微处理器模块100检测电流检测模块400输出的电压值，并根据电压值计算出电流值，所述电流值为第一电流值；
微处理器模块100根据第一电流值调节其输出的驱动频率；
可选地，在本实施例中，，微处理器模块100根据第一电流值调节其输出的驱动频率，包括：
微处理器模块100判断所述第一电流值与所述微处理器模块100的驱动频率的导数是否为0。
若导数为0，则微处理器模块100以驱动频率驱动所述驱动电机300转动。
若导数不为0，则微处理器模块100调整其输出的驱动频率，直至驱动频率与第一电流值的导数为0，并以调节后的驱动频率驱动所述驱动电机300转动。
可选地，在步骤S10后，还包括：
微处理器模块100输出驱动频率的驱动波至驱动电机300的驱动电机控制模块。
驱动电机控制模块根据接收的驱动频率的驱动波驱动电机300转动。换句话说，驱动电机300可以与一驱动电机控制模块连接，该驱动电机控制模块可以接收微处理器模块100发送的控制信号，该控制信号为所述驱动频率，驱动电机控制模块可以根据该驱动频率控制驱动电机300的转动频率或转速。其中，驱动电机控制模块可以通过控制输出至驱动电 机的电流大小或者电流的占空比，来控制驱动电机300的转动频率或转速。
可选地，在本实施例中，所述微处理器模块100可以记录所述调节后的驱动频率，并且所述微处理器模块100可以在检测到所述电动牙刷暂停工作并重新启动时，以暂停在电动牙刷暂停工作前记录的所述调节后的驱动频率驱动所述驱动电机工作。
例如，在电动牙刷暂停重新启动后，所述微处理器模块100以上一次电动牙刷暂停时的驱动频率驱动所述驱动电机300。
如图3、图4所示，本申请还公开了一种电动牙刷驱动频率控制系统，包括微处理器模块100、驱动电机控制模块200、驱动电机300及电流检测模块400。微处理器模块100与驱动电机控制模块200相连，微处理器模块100输出驱动频率的驱动波至驱动电机控制模块200。
驱动电机控制模块200构造成接收微处理器输出的驱动频率的驱动波后，驱动所述驱动电机300转动。
驱动电机300构造成驱动电动牙刷头转动。
电流检测模块400其输入端与驱动电机300相连，其输出端与微处理器模块100相连，所述电流检测模块400检测所述驱动电机300的电流，并将所述驱动电流转换成驱动电压输出至微处理器模块100。
可选地，在本实施例中，所述微处理器模块100可以根据所述电流检测模块400输出的电压调节其输出的驱动频率。
在本实施例中，所述微处理器模块100可以为具有接收信息并对信息进行逻辑判断处理能力的电路或芯片。例如，本实施例的所述微处理器模块100可以为单片机，且所述单片机上设有A/D接口。
可选地，在本实施例中，本实施例的电流检测模块400包括第一电阻R1、第二电阻R2、第三电阻R3及运放，所述第一电阻R1的一端与驱动电机300相连，所述第一电阻R1的另一端与第二电阻R2相连，所述第二电阻R2的另一端分别与第三电阻R3的一端及运放的正向端相连，运放的反向端与驱动电机300相连，第三电阻R3的另一端及运放的输出端与微处理器模块100相连。
本实施例的驱动电机的电流输入至电流检测模块后，根据第一电阻R1、第二电阻R2、第三电阻R3的阻值及驱动电机的电流值，再根据U＝(1+R3/R2)*I*R1即可得出输出至微控制器模块的电压值。
下面对本申请的优点或原理进行说明：
1、电动牙刷在运行时，通过实时检测驱动电机300的电流，根据电流实时调节微处理器模块100的驱动频率，使微处理器模块100的驱动频率与驱动电机300的固有频率一致， 当驱动频率与固有频率一致时，电动牙刷达到最优的工作状态，此时电动牙刷的功耗低、噪声低、震感低，能带给客户更好的刷牙体验。
2、通过对驱动电机300电流的实时检测，便于微处理器模块100对驱动电机300的精确控制，且能大幅降低电动牙刷的整体功耗。
3、驱动电机300的固有频率在驱动电机300的运行过程中不断变换，当电动牙刷的电流与驱动频率的导数为0或趋近于0时，微处理器模块100的驱动频率与驱动电机300的固有频率一致，通过检测驱动电机300的电流，根据驱动电机300的电流即可调节微处理器模块100的驱动频率，调节方式简单精确。
4、电流检测模块400连接驱动电机300及微控制器模块100，使微处理器模块100与驱动电机300实现闭环控制，达到微处理器模块100的驱动频率与驱动电机300往复运动的固有频率谐振的效果。
以上仅为本申请的可选实施例，并不以此限定本申请的保护范围；在不违反本申请构思的基础上所作的任何替换与改进，均属本申请的保护范围。
工业实用性
电动牙刷驱动频率控制方法及其控制系统，通过在电动牙刷工作时实时检测驱动电机的工作电流，并根据该工作电流实时调整驱动电机的工作频率，使驱动电机的工作频率趋近于驱动电机的固有频率，从而使电动牙刷达到最优的谐振工作状态，可以降低电涌压牙刷的功耗、噪声，给客户更好的刷牙体验。

Claims (15)

  1. 电动牙刷驱动频率控制方法，其特征在于，应用于包括微处理器模块、驱动电机及电流检测模块的电动牙刷驱动频率控制系统，所述方法包括以下步骤：
    A、启动电动牙刷；
    B、使所述电动牙刷的驱动电机以固定频率转动；
    C、通过所述电流检测模块实时检测所述驱动电机的电流；
    D、通过所述微处理器模块根据所述电流检测模块检测到的驱动电机的电流调节其输出的驱动频率，以使所述驱动频率与所述驱动电机的固有频率一致。
  2. 如权利要求1所述电动牙刷驱动频率控制方法，其特征在于，所述微处理器模块根据所述电流检测模块检测到的驱动电机的电流调节其输出的驱动频率的步骤，包括：
    微处理器模块检测所述电流采集模块采集的电流值与所述微处理器模块的驱动频率的导数的值是否大于预设阈值；
    若所述导数的值不高于所述预设阈值，则所述微处理器模块以驱动频率驱动所述驱动电机工作；
    若所述导数的值高于所述预设阈值，则所述微处理器模块调整其输出的驱动频率，直至所述导数的值不高于所述预设阈值，并以调节后的驱动频率驱动所述驱动电机工作。
  3. 如权利要求1或2所述电动牙刷驱动频率控制方法，其特征在于，所述方法还包括：
    所述微处理器记录调节后的驱动频率；
    所述微处理器在检测到所述电动牙刷暂停工作并重新启动时，以暂停在电动牙刷暂停工作前记录的所述调节后的驱动频率驱动所述驱动电机工作。
  4. 如权利要求1所述电动牙刷驱动频率控制方法，其特征在于，在步骤C之后，所述方法还包括：
    电流检测模块将驱动电机的电流转换成电压输出至微处理器模块；
    微处理器模块检测电流检测模块输出的电压值，并根据电压值计算出电流值，所述电流值为第一电流值；
    微处理器模块根据第一电流值调节其输出的驱动频率。
  5. 如权利要求1或4所述电动牙刷驱动频率控制方法，其特征在于，微处理器模块根据第一电流值调节其输出的驱动频率，包括：
    微处理器模块判断所述第一电流值与所述微处理器模块的驱动频率的导数是否为0；
    若导数为0，则微处理器模块以驱动频率驱动所述驱动电机转动；
    若导数不为0，则微处理器模块调整其输出的驱动频率，直至驱动频率与第一电流值的 导数为0，并以调节后的驱动频率驱动所述驱动电机转动。
  6. 如权利要求1-5任意一项所述电动牙刷驱动频率控制方法，其特征在于，所述电动牙刷驱动频率控制系统还包括驱动电机控制模块；在步骤A后，所述方法还包括：
    微处理器模块输出驱动频率的驱动波至驱动电机的驱动电机控制模块；
    驱动电机控制模块根据接收的驱动频率的驱动波驱动电机转动。
  7. 如权利要求6所述电动牙刷驱动频率控制方法，其特征在于，所述驱动电机控制模块根据接收的驱动频率的驱动波驱动电机转动的方式包括：
    所述驱动电机控制模块根据接收到的所述驱动频率调整所述驱动电机的电流大小或电流占空比大小，从而控制所述驱动电机的转速或转动频率。
  8. 如权利要求6所述电动牙刷驱动频率控制方法，其特征在于，在电动牙刷暂停重新启动后，所述微处理器模块以上一次电动牙刷暂停时的驱动频率驱动所述驱动电机。
  9. 电动牙刷驱动频率控制系统，其特征在于，包括微处理器模块、驱动电机控制模块、驱动电机及电流检测模块；
    所述微处理器模块与所述驱动电机控制模块相连，所述微处理器模块配置成输出驱动频率的驱动波至所述驱动电机控制模块；
    所述驱动电机控制模块构造成接收所述微处理器输出的驱动频率的驱动波后，驱动所述驱动电机转动；
    所述驱动电机构造成驱动电动牙刷头转动；
    所述电流检测模块的输入端与所述驱动电机相连，其输出端与所述微处理器模块相连，所述电流检测模块构造成检测所述驱动电机的电流，并将所述驱动电流转换成驱动电压输出至微处理器模块。
  10. 如权利要求9所述电动牙刷驱动频率控制系统，其特征在于，微处理器模块具体配置成检测所述电流采集模块采集的电流值与所述微处理器模块的驱动频率的导数的值是否大于预设阈值；若所述导数的值不高于所述预设阈值，则所述微处理器模块以驱动频率驱动所述驱动电机工作；若所述导数的值高于所述预设阈值，则所述微处理器模块调整其输出的驱动频率，直至所述导数的值不高于所述预设阈值，并以调节后的驱动频率驱动所述驱动电机工作。
  11. 如权利要求9或10所述电动牙刷驱动频率控制系统，其特征在于，所述微处理器还配置成记录所述调节后的驱动频率；所述微处理器在检测到所述电动牙刷暂停工作并重新启动时，以暂停在电动牙刷暂停工作前记录的所述调节后的驱动频率驱动所述驱动电机工作。
  12. 如权利要求9-11任意一项所述电动牙刷驱动频率控制系统，其特征在于，所述微处 理器模块配置成根据所述电流检测模块输出的电压调节其输出的驱动频率。
  13. 如权利要求9-12任意一项所述电动牙刷驱动频率控制系统，其特征在于，所述电流检测模块包括第一电阻R1、第二电阻R2、第三电阻R3及运放，所述第一电阻R1的一端与所述驱动电机相连，所述第一电阻R1的另一端与第二电阻R2相连，所述第二电阻R2的另一端分别与第三电阻R3的一端及所述运放的正向端相连，所述运放的反向端与所述驱动电机相连，所述第三电阻R3的另一端及所述运放的输出端与所述微处理器模块相连。
  14. 如权利要求9-13任意一项所述电动牙刷驱动频率控制系统，其特征在于，所述微处理器模块为单片机。
  15. 如权利要求14所述电动牙刷驱动频率控制系统，其特征在于，所述单片机上设有A/D接口。
PCT/CN2019/100640 2019-01-18 2019-08-14 电动牙刷驱动频率控制方法及其控制系统 WO2020147307A1 (zh)

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