Electric toothbrush control device, electric toothbrush and control method

Abstract

The invention relates to the technical field of toothbrushes, in particular to an electric toothbrush control device, an electric toothbrush and a control method.In the control method and the control device, a control module is connected with a motor driving circuit, the motor driving circuit is connected with a motor module, and a mode instruction carrying a working mode is responded through the control module; generating a motor driving signal corresponding to the working mode, and inputting the motor driving signal into a motor driving circuit; the problem that in the prior art, tooth cleaning is achieved only through high-frequency vibration, tooth parts to be cleaned are prone to being omitted, and consequently tooth cleaning is not comprehensive is solved. By adopting the motor module provided by the invention, the control mode of the driving motor is simplified, and the problems that the existing sweeping vibration type electric toothbrush is driven by a servo motor, the control mode is complicated, the production cost is high, and the reliability is lower than that of a vibration type toothbrush are solved.

Description

[0001] This application is a divisional application of the Chinese patent application No. 202410609004.3, filed with the China National Intellectual Property Office on May 16, 2024, and entitled "Electric Toothbrush Control Device, Electric Toothbrush and Control Method", the whole content of this application is contained in the parent case. TECHNICAL FIELD

[0002] The present application relates to the technical field of toothbrushes, and in particular to an electric toothbrush control device, an electric toothbrush and a control method. BACKGROUND

[0003] The existing vibration toothbrush generates high-frequency vibration through a vibration motor to achieve tooth cleaning. When a user uses the vibration electric toothbrush for a long time, the user is likely to develop a habit of not performing manual sweeping and only relying on the high-frequency vibration of the vibration electric toothbrush to achieve tooth cleaning. However, the vibration range of the existing electric vibration toothbrush is small, and if the vibration electric toothbrush is used to clean teeth according to the above cleaning habit for a long time, the tooth parts that need to be cleaned are likely to be missed, causing incomplete tooth cleaning. SUMMARY

[0004] The present application provides an electric toothbrush control device, an electric toothbrush and a control method, which are used to solve the problem that the existing technology only relies on high-frequency vibration to achieve tooth cleaning, which is likely to miss the tooth parts that need to be cleaned, resulting in incomplete tooth cleaning.

[0005] In one aspect, the present application provides a control device of an electric toothbrush, comprising: a control module, a motor driving circuit and a motor module.

[0006] The motor driving circuit is connected with the motor module.

[0007] The control module is connected with the motor driving circuit, and is configured to generate a motor driving signal corresponding to a working mode in response to a mode instruction carrying the working mode, and input the motor driving signal into the motor driving circuit; wherein the working mode includes a swing mode, a vibration mode and a swing-vibration mode.

[0008] The motor driving circuit is connected with the motor module, and is configured to drive the motor module to operate in the working mode in response to the motor driving signal.

[0009] Optionally, when the working mode is the swing mode, the control module is specifically configured to obtain a target low-frequency signal and a carrier signal, and generate a first motor driving signal according to the target low-frequency signal and the carrier signal, and input the first motor driving signal into the motor driving circuit.

[0010] The motor driving circuit is specifically configured to generate a first driving current in response to the first motor driving signal, and the first driving current is used to make the rotor of the motor module swing around a balanced position with a preset first swing amplitude and a preset first swing frequency.

[0011] Optionally, when the working mode is the vibration mode, the control module is specifically configured to acquire a target high-frequency signal and the carrier signal, generate a second motor driving signal according to the target high-frequency signal and the carrier signal, and input the second motor driving signal into the motor driving circuit.

[0012] The motor driving circuit is specifically configured to generate a second driving current in response to the second motor driving signal, and the second driving current is used to make the rotor of the motor module vibrate around the balanced position with a preset first vibration amplitude and a preset first vibration frequency.

[0013] Optionally, when the working mode is the swing-vibration mode, the control module is specifically configured to acquire a target high-frequency signal, a target low-frequency signal and a carrier signal, superimpose the target high-frequency signal and the target low-frequency signal to obtain a target modulation signal, generate a third motor driving signal according to the target modulation signal and the carrier signal, and input the third motor driving signal into the motor driving circuit.

[0014] The motor driving circuit is specifically configured to generate a third driving current in response to the third motor driving signal, and the third driving current is used to make the rotor of the motor module swing around the balanced position with the first swing amplitude and the first swing frequency, and make the rotor of the motor module vibrate around a current swing position with the first vibration amplitude and the first vibration frequency.

[0015] Optionally, the motor driving circuit comprises:

[0016] The direct-current power supply is connected with a direct-current side of the inverter circuit module.

[0017] An alternating-current output side of the inverter circuit module is connected with the winding of the motor module.

[0018] Another aspect of the present application provides an electric toothbrush comprising the control device as described above.

[0019] Another aspect of the present application provides a control method of an electric toothbrush, comprising:

[0020] In response to a mode instruction carrying a working mode, a motor driving signal corresponding to the working mode is generated; the working mode comprises a swing mode, a vibration mode and a swing-vibration mode.

[0021] inputting the motor driving signal into a motor driving circuit, so that the motor driving circuit drives the motor module to operate in the working mode.

[0022] Optionally, when the working mode is the swing mode, the response to the mode instruction carrying the working mode to generate the motor driving signal corresponding to the working mode comprises:

[0023] acquiring a target low-frequency signal and a carrier signal, and generating a first motor driving signal according to the target low-frequency signal and the carrier signal,

[0024] The inputting the motor driving signal into a motor driving circuit, so that the motor driving circuit drives the motor module to operate in the working mode, specifically comprises:

[0025] inputting the first motor driving signal into the motor driving circuit; and the motor driving circuit generates a first driving current in response to the first motor driving signal, the first driving current being used for making the rotor of the motor module swing with a preset first swing amplitude and a preset first swing frequency, with the balance position as the center.

[0026] Optionally, when the working mode is the vibration mode, the response to the mode instruction carrying the working mode to generate the motor driving signal corresponding to the working mode comprises:

[0027] acquiring a target high-frequency signal and the carrier signal, and generating a second motor driving signal according to the target high-frequency signal and the carrier signal;

[0028] The inputting the motor driving signal into a motor driving circuit, so that the motor driving circuit drives the motor module to operate in the working mode, specifically comprises:

[0029] inputting the second motor driving signal into the motor driving circuit, so that the motor driving circuit generates a second driving current in response to the second motor driving signal, the second driving current being used for making the rotor of the motor module vibrate with a preset first vibration amplitude and a preset first vibration frequency, with the balance position as the center.

[0030] Optionally, when the working mode is the swing-vibration mode, the response to the mode instruction carrying the working mode to generate the motor driving signal corresponding to the working mode comprises:

[0031] acquiring a target high-frequency signal, a target low-frequency signal and a carrier signal, superimposing the target high-frequency signal and the target low-frequency signal to obtain a target modulation signal, and generating a third motor driving signal according to the target modulation signal and the carrier signal;

[0032] The motor driving signal is input into the motor driving circuit, so that the motor driving circuit drives the motor module to operate in the working mode, specifically comprising:

[0033] The third motor driving signal is input into the motor driving circuit, so that the motor driving circuit generates a third driving current in response to the third motor driving signal, the third driving current is used for making the rotor of the motor module swing around the balance position with the first swing amplitude and the first swing frequency, and simultaneously making the rotor of the motor module vibrate around the current swing position with the first vibration amplitude and the first vibration frequency.

[0034] From the above technical solutions, the present application has the following advantages:

[0035] The present application provides a kind of electric toothbrush control device, comprising: control module, motor driving circuit, motor module;The motor driving circuit is connected with the motor module;The control module is connected with the motor driving circuit, for responding mode instruction carrying working mode, generates the motor driving signal corresponding to the working mode, and the motor driving signal is input into the motor driving circuit;The working mode includes swing mode, vibration mode and swing vibration mode;The motor driving circuit is connected with the motor module, for responding the motor driving signal, drives the motor module to operate in the working mode.

[0036] In the present application, the control module is connected with the motor driving circuit, for responding mode instruction carrying working mode, generates the motor driving signal corresponding to the working mode, and the motor driving signal is input into the motor driving circuit, thereby obtaining the motor driving signal for controlling different working modes of motor module;The motor driving circuit is connected with the motor module, for responding the motor driving signal, drives the motor module to operate in the working mode, wherein, the working mode of the motor module of the present application includes swing mode, vibration mode and swing vibration mode, therefore, the present application can be targeted to generate different motor driving signals of different working modes, realize the adjustment and switching of motor module working mode, thereby providing a variety of rich function modes for user, when using, user can switch function mode according to actual demand, thereby fully, comprehensively carries out tooth cleaning, avoids the problem that only high frequency vibration is used to realize tooth cleaning in prior art, and easily misses the part to be cleaned, causes tooth cleaning not comprehensive.

[0037] The application further provides a control method of the electric toothbrush, which comprises the following steps: generating a motor driving signal corresponding to a working mode in response to a mode instruction carrying the working mode; the working mode comprises a swing mode, a vibration mode and a swing-vibration mode; and inputting the motor driving signal into a motor driving circuit to drive the motor module to operate in the working mode, so as to solve the problem that the prior art only relies on high-frequency vibration to realize tooth cleaning, and the tooth cleaning is not comprehensive because the tooth parts to be cleaned are easily missed. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0039] Figure 1 A structural schematic diagram of a control device of an electric toothbrush provided by the embodiment of the present application;

[0040] Figure 2 A two-dimensional sectional structural schematic diagram of a motor module provided by the embodiment of the present application;

[0041] Figure 3 A structural schematic diagram of a motor driving circuit provided by the embodiment of the present application;

[0042] Figure 4 A waveform schematic diagram of a motor driving signal provided by the embodiment of the present application;

[0043] Figure 5 A waveform schematic diagram of superposition of a target high-frequency signal and a target low-frequency signal provided by the embodiment of the present application;

[0044] Figure 6 A waveform schematic diagram of a driving current provided by the embodiment of the present application;

[0045] Figure 7 A two-dimensional sectional structural schematic diagram of a motor module provided by the embodiment of the present application;

[0046] Figure 8 A two-dimensional sectional structural schematic diagram of a motor module provided by the embodiment of the present application;

[0047] Figure 9 An operation flow schematic diagram of a control device of an electric toothbrush provided by the embodiment of the present application;

[0048] Figure 10 A step flow chart of a control method of an electric toothbrush provided by the embodiment of the present application. DETAILED DESCRIPTION

[0049] The embodiment of the present application provides an electric toothbrush control device, an electric toothbrush and a control method, and aims at solving the problem that the prior art only relies on high-frequency vibration to realize tooth cleaning, and thus the tooth cleaning is not comprehensive.

[0050] In order to make the invention purposes, features and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the following described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0051] Please refer to Figure 1 The present application provides an electric toothbrush control device, which comprises a control module 1, a motor driving circuit 2 and a motor module 3. The motor driving circuit 2 is connected with the motor module 3. The control module 1 is connected with the motor driving circuit 2, and is used for generating a motor driving signal corresponding to a working mode in response to a mode instruction carrying the working mode, and inputting the motor driving signal into the motor driving circuit 2. The working mode comprises a swing mode, a vibration mode and a swing-vibration mode. The motor driving circuit 2 is connected with the motor module 3, and is used for driving the motor module 3 to operate in the working mode in response to the motor driving signal.

[0052] It should be noted that the swing mode refers to that the motor module 3 swings at a preset first swing amplitude and a preset first swing frequency. The vibration mode refers to that the motor module 3 vibrates at a preset first vibration amplitude and a preset first vibration frequency. The swing-vibration mode refers to that the motor module 3 swings at the first swing amplitude and the first swing frequency, and vibrates at the first vibration amplitude and the first vibration frequency. The above three working modes are in an "or" relationship. The motor module 3 is used for driving the brush head of the electric toothbrush to move correspondingly. It can be understood that the movement of the brush head is consistent with the movement of the motor module 3.

[0053] In actual application, the working principle of the present embodiment is as follows:

[0054] The user inputs a mode instruction carrying a working mode to the control module 1, and the control module 1 receives the mode instruction, analyzes the mode instruction, and obtains the corresponding working mode, wherein the working mode includes a swing mode, a vibration mode and a swing-vibration mode, then the control module 1 generates a motor driving signal corresponding to the working mode, such as a motor driving signal of the swing mode, a motor driving signal corresponding to the vibration mode, and a motor driving signal corresponding to the swing-vibration mode, and inputs the corresponding motor driving signal into the motor driving circuit 2, and the motor driving circuit 2 receives the motor driving signal, responds to the motor driving signal, and controls the motor module 3 to operate in the corresponding working mode to realize cleaning of the teeth.

[0055] For example, when the received motor driving signal is the motor driving signal corresponding to the swing-vibration mode, the motor driving circuit 2 controls the motor module 3 to operate in the swing-vibration mode, so that the brush head of the electric toothbrush swings at a first swing amplitude and a first swing frequency, and vibrates at a first vibration amplitude and a first vibration frequency, so that the brush head of the electric toothbrush swings at a preset first swing amplitude and swing frequency to realize simulation of the user's manual swinging, increase the cleaning area, and also vibrate at a preset first vibration amplitude and first vibration frequency to strengthen the cleaning strength, thereby improving the cleaning degree of the to-be-cleaned tooth part, and avoiding the problem that the existing vibration type electric toothbrush is difficult to simulate the swinging action of the user's manual tooth brushing due to a small vibration interval, resulting in incomplete cleaning of the tooth part.

[0056] In the embodiment, the control module 1 is connected with the motor driving circuit 2, and is used to respond to the mode instruction carrying the working mode, generate the motor driving signal corresponding to the working mode, and input the motor driving signal into the motor driving circuit 2, so as to obtain the motor driving signal for controlling different working modes of the motor module 3; the motor driving circuit 2 is connected with the motor module 3, and is used to respond to the motor driving signal to drive the motor module 3 to operate in the working mode, so as to realize adjustment of the working mode of the motor module 3. In the application, the working mode of the motor module 3 includes the swing mode, the vibration mode and the swing-vibration mode, so that the user is provided with a variety of rich use modes, and the working mode of the motor module 3 can be switched according to the user's demand, thereby avoiding the problem that the prior art only relies on high-frequency vibration to realize tooth cleaning, and easily misses the to-be-cleaned tooth part, resulting in incomplete cleaning of the tooth, and the operation is simple, the learning cost of the user is reduced, the use threshold of the user is lowered, and the use experience of the user is improved.

[0057] It should be noted that the motor module in the application can be a motor containing a pair of pole structures, as an example, for example, the structure of the motor module 3 can be a limited angle motor structure as shown in Figure 2 Figure 2 ​As shown, the motor module 3 may include an integrally formed stator core 11;

[0058] The stator core 11 has a stator left tooth winding 12 and a stator right tooth winding 17 on its two sides respectively;

[0059] The stator core 11 has a motor rotor 14 located in the middle.

[0060] A rotating shaft 15 is provided in the middle of the motor rotor 14;

[0061] The circumference of the motor rotor 14 is provided with a first rotor permanent magnet 13 and a second rotor permanent magnet 16;

[0062] The stator left tooth winding 12 and the stator right tooth winding 17 are wound in series and connected to the AC output side of the motor drive circuit 2.

[0063] exist Figure 2 In this design, both the stator left tooth winding 12 and the stator right tooth winding 17 are single-phase windings, which are connected in series and wound around the iron cores on both sides. Therefore, the current directions of the stator left tooth winding 12 and the stator right tooth winding 17 are the same. The first rotor permanent magnet 13 and the second rotor permanent magnet 16 are fixedly connected to the rotor 14 by strong adhesive.

[0064] Its working principle is as follows:

[0065] The motor drive circuit 2 responds to the motor drive signal and outputs the corresponding drive current to the stator left tooth winding 12 and the stator right tooth winding 17, thereby causing the motor rotor 14 to move according to the corresponding working mode under the action of the first rotor permanent magnet 13 and the second rotor permanent magnet 16.

[0066] This embodiment simplifies the control method of the drive motor by adopting the motor module 3 with the above-described structure, making the driving method of the motor module 3 more convenient. It avoids the situation where existing sweeping electric toothbrushes use servo motors for driving, which have complex control methods, high requirements for motors and their driving hardware, resulting in higher production costs and lower reliability compared to vibrating toothbrushes.

[0067] In one specific embodiment, the magnetization direction of the first rotor permanent magnet 13 is towards the outside of the motor rotor 14, and the magnetization direction of the second rotor permanent magnet 1 is towards the inside of the motor rotor 14.

[0068] It should be noted that, as Figure 2 As shown, the number of first rotor permanent magnets 13 can be 2, and the number of second rotor permanent magnets 16 can be 2. The arrangement of the first rotor permanent magnets 13 and the second rotor permanent magnets 16 is NNSS. Figure 2 For example, Figure 2The first rotor permanent magnet 13 of the motor module 3 is N-pole at one end close to the inner side of the rotor, and the second rotor permanent magnet 16 is S-pole at one end close to the inner side of the rotor. It can be understood that the magnetization direction of all the first rotor permanent magnets 13 is towards the outer side of the motor rotor 14, and the magnetization direction of all the second rotor permanent magnets 16 is towards the inner side of the motor rotor 14.

[0069] Specifically, the magnetization mode of the first rotor permanent magnet 13 and the second rotor permanent magnet 16 includes parallel magnetization.

[0070] It can be understood that, Figure 2 The motor structure shown is only used to specifically describe one embodiment of the motor module 3 proposed by the present application, and is not limited to this type of motor. The control principle of the control module 1 of the present application is applicable to motors similar to the limited angle motor structure shown. Figure 2

[0071] In a specific embodiment, the motor drive circuit 2 includes a direct current power supply 18 and an inverter circuit module.

[0072] The direct current power supply 18 is connected to the direct current side of the inverter circuit module.

[0073] The alternating current output side of the inverter circuit module is connected to the winding of the motor module 3.

[0074] It should be noted that the direct current power supply 18 is used to provide direct current power. In the present embodiment, the inverter circuit module can adopt a single-phase full-bridge inverter drive circuit, such as Figure 3 As shown, the drive circuit is an H-bridge drive circuit, including a first bridge arm switch tube 19, a second bridge arm switch tube 101, a third bridge arm switch tube 102, and a fourth bridge arm switch tube 103. The first bridge arm switch tube 19, the second bridge arm switch tube 101, the third bridge arm switch tube 102, and the fourth bridge arm switch tube 103 are all connected with reverse diodes, which are used to ensure normal freewheeling.

[0075] The connection between the first bridge arm switch tube 19 and the third bridge arm switch tube 102 is connected to the winding 100 of the motor module 3, and the connection between the second bridge arm switch tube 101 and the fourth bridge arm switch tube 103 is connected to the winding 100 of the motor module 3. When the motor module 3 adopts the motor structure as shown in Figure 2

[0076] The working principle of the present embodiment is as follows:

[0077] ​​Control module 1 outputs motor drive signals to the first bridge arm switch 19, the second bridge arm switch 101, the third bridge arm switch 102, and the fourth bridge arm switch 103 to adjust their on and off states. The changes in the on and off states of these switches cause changes in the voltage across the winding 100 of motor module 3, which in turn causes changes in the current in the winding 100. Consequently, the rotor of motor module 3 moves in accordance with the changing drive current waveform, allowing motor module 3 to operate in the corresponding working mode.

[0078] The relationship between the on and off states of the first bridge arm switch 19, the second bridge arm switch 101, the third bridge arm switch 102, and the fourth bridge arm switch 103 is as follows: the first bridge arm switch 19 and the third bridge arm switch 102 are turned off simultaneously; the second bridge arm switch 101 and the fourth bridge arm switch 103 are turned off simultaneously.

[0079] In one specific embodiment, the motor drive signal includes a first motor drive signal, a second motor drive signal, and a third motor drive signal.

[0080] The oscillation mode corresponds to the first motor drive signal; the vibration mode corresponds to the second motor drive signal; and the oscillation mode corresponds to the third motor drive signal. The first, second, and third motor drive signals can be PWM signals.

[0081] In a specific embodiment, when the working mode is the swing mode, the control module 1 is specifically used to acquire the target low-frequency signal and the carrier signal, and generate a first motor drive signal based on the target low-frequency signal and the carrier signal, and input the first motor drive signal into the motor drive circuit 2;

[0082] The motor drive circuit 2 is specifically used to respond to the first motor drive signal and generate a first drive current. The first drive current is used to make the rotor of the motor module 3 swing around the balance position with a preset first swing amplitude and a preset first swing frequency.

[0083] It should be noted that the target low-frequency signal can be obtained by the control chip of control module 1 through a lookup table. The carrier signal can be a high-frequency triangular carrier signal. The high-frequency triangular carrier signal can be provided by a counter in the center-aligned mode of the control chip of control module 1. Therefore, this embodiment does not require an external signal source, reducing device cost. When motor module 3 uses... Figure 2 In the motor structure shown, the rotor of motor module 3 is motor rotor 14.

[0084] by Figure 2 Taking the motor structure shown as an example, the working principle of this embodiment is explained as follows:

[0085] In this embodiment, the process by which the control module 1 generates the first motor drive signal based on the target low-frequency signal and the carrier signal can be achieved by using a preset modulation method. The target low-frequency signal is used as the modulation signal, and the target low-frequency signal and the carrier signal are modulated to obtain a PWM signal. The PWM signal is then used to adjust the on and off states of the first bridge arm switch 19, the second bridge arm switch 101, the third bridge arm switch 102, and the fourth bridge arm switch 103, thereby changing the voltage across the winding 100 and thus changing the current in the winding 100 (i.e., the first drive current). As a result, under the action of the magnetic field built by the first rotor permanent magnet 13 and the second rotor permanent magnet 16, the motor rotor 14 swings according to the first swing amplitude and the first swing frequency.

[0086] The values ​​of the first swing amplitude and the first swing frequency can be set according to actual needs, and the values ​​of the first swing amplitude and the first swing frequency can be adjusted by adjusting the amplitude and frequency of the modulation signal to achieve the actual required values.

[0087] In one example, this example uses SPWM modulation and a sine wave signal as the modulation signal for illustration. Figure 4 As shown, 104 is the sinusoidal modulation signal, 105 is the high-frequency triangular carrier signal, and 106 and 107 are the generated PWM signals. S1 and S4 correspond to the first bridge arm switch 19 and the third bridge arm switch 102, respectively, and S2 and S3 correspond to the second bridge arm switch 101 and the fourth bridge arm switch 103, respectively. When the value of the modulation signal 104 is higher than that of the high-frequency triangular carrier signal 105, the PWM output is high, controlling the corresponding switch to turn on. Figure 4 It can be seen that when the modulation signal 104 is greater than 0, the corresponding PWM signal 106 controls the on / off state of the first bridge arm switch 19 and the third bridge arm switch 102; when the modulation signal 104 is less than 0, the PWM signal 107 controls the on / off state of the second bridge arm switch 101 and the fourth bridge arm switch 103. According to the pulse width modulation principle, the change in the on / off state of the first bridge arm switch 19, the second bridge arm switch 101, the third bridge arm switch 102, and the fourth bridge arm switch 103 causes a change in the voltage signal generated across the winding 100. The voltage change across the winding 100 causes a change in current. At this time, the waveform of the current change in the winding 100 is equivalent to the waveform of the modulation signal 104. The current waveform of the winding 100 is also the first motor drive current. Therefore, the change in the current of the winding 100 causes the motor rotor 14 to oscillate around the equilibrium position with a preset first oscillation amplitude and a preset first oscillation frequency.

[0088] Therefore, the embodiment can obtain the first motor driving current with different amplitudes and frequencies by adjusting the amplitude and frequency of the modulation signal 104.

[0089] When the working mode is the vibration mode, the control module 1 is specifically configured to obtain a target high-frequency signal and a carrier signal, and generate a second motor driving signal according to the target high-frequency signal and the carrier signal, and input the second motor driving signal into the motor driving circuit 2.

[0090] The motor driving circuit 2 is specifically configured to generate a second driving current in response to the second motor driving signal, and the second driving current is used to make the rotor of the motor module 3 vibrate around the balance position with a preset first vibration amplitude and a preset first vibration frequency.

[0091] It should be noted that the target high-frequency signal can be obtained by the control chip of the control module 1 through table lookup.

[0092] Taking the motor structure shown in FIG. 1 as an example, the working principle of the embodiment is described as follows: Figure 2

[0093] The control module 1 generates the first motor driving signal according to the target high-frequency signal and the carrier signal. The process can be that a preset modulation method is adopted, the target high-frequency signal is taken as a modulation signal, the target high-frequency signal and the carrier signal are modulated to obtain a PWM signal, the conduction state and the off state of the first bridge arm switch tube 19, the second bridge arm switch tube 101, the third bridge arm switch tube 102 and the fourth bridge arm switch tube 103 are adjusted through the PWM signal, the voltage across the winding 100 is changed, the current (i.e. the second driving current) of the winding 100 is changed, and the motor rotor 14 vibrates according to the first vibration amplitude and the first vibration frequency under the action of the magnetic field built by the first rotor permanent magnet 13 and the second rotor permanent magnet 16.

[0094] Among them, the generation principle of the second driving current is similar to that of the first motor driving signal, and the foregoing description can be referred to, which will not be repeated here.

[0095] Among them, the values of the first vibration amplitude and the first vibration frequency can be set according to actual needs, and the values of the first vibration amplitude and the first vibration frequency can be adjusted by adjusting the amplitude and frequency of the modulation signal, so that the values of the first vibration amplitude and the first vibration frequency reach the actual required values.

[0096] ​In a specific embodiment, when the working mode is the swing-vibration mode, the control module 1 is specifically configured to obtain a target high-frequency signal, a target low-frequency signal, and a carrier signal, superimpose the target high-frequency signal and the target low-frequency signal to obtain a target modulation signal, and generate a third motor driving signal according to the target modulation signal and the carrier signal; and input the third motor driving signal into the motor driving circuit 2.

[0097] The motor driving circuit 2 is specifically configured to generate a third driving current in response to the third motor driving signal, the third driving current being used to make the rotor of the motor module 3 swing around a balance position with a first swing amplitude and a first swing frequency, and simultaneously make the rotor of the motor module 3 vibrate around a current swing position with a first vibration amplitude and a first vibration frequency.

[0098] It should be noted that, in the embodiment, when the working mode is the swing-vibration mode, the rotor of the motor module 3 simultaneously swings and vibrates, so as to simulate the user's manual sweeping of the cleaning area, improve the cleaning degree of the teeth, and expand the cleaning area. Since the position of the rotor of the motor module 3 changes during the swing, the motor module 3 in the embodiment vibrates around the real-time swing position of the rotor, and thus the current swing position refers to the position of the motor rotor 14 obtained in real time.

[0099] For example, the motor structure shown in Figure 2 The working principle of the embodiment is described as follows.

[0100] When the working mode is the swing-vibration mode, the control module 1 superimposes the target high-frequency signal and the target low-frequency signal based on a preset modulation method to obtain a target modulation signal, and modulates the target modulation signal with a high-frequency carrier signal to obtain a PWM signal using the preset modulation method. At this time, the PWM signal is the third motor driving signal. Then, the third driving signal is input into each switch tube in the motor driving circuit 2, and each switch tube is turned on and off, so as to change the current of the winding 100. At this time, the current of the winding 100 is the third driving current. According to the principle of pulse width modulation, the waveform of the third driving current is consistent with the waveform of the target modulation signal, which is also the superposition of the high-frequency current signal and the low-frequency current signal. Therefore, under the action of the third driving current and the magnetic field of the first rotor permanent magnet 13 and the second rotor permanent magnet 16, the motor rotor 14 swings around the balance position with the first swing amplitude and the first swing frequency, and simultaneously vibrates around the current swing position with the first vibration amplitude and the first vibration frequency.

[0101] In an example, the superimposed waveform of the target high-frequency signal and the target low-frequency signal is as shown in Figure 5 .

[0102] In one example, the preset modulation method can adopt, but is not limited to, SPWM, SVPWM, DPWM, etc. can carry out high and low frequency signal modulation and the modulation method capable of generating high frequency signal and low frequency signal superposition signal modulation.

[0103] In one example, the target high frequency signal and the target low frequency signal can adopt, but are not limited to, sine wave, sawtooth wave, steamed bread wave. The frequency of the target high frequency signal and the target low frequency signal can be selected according to the actual situation.

[0104] Taking the example that the target high frequency signal and the target low frequency signal both adopt sine wave and the working mode is swing mode, as shown in Figure 5 , 108 is the target high frequency signal, 109 is the target low frequency signal, and the superimposed signal acts on the motor driving circuit 2. The driving current generated on the winding 100 of the motor is shown as 110 in Figure 6 .

[0105] In order to more clearly illustrate the wide applicability of the motor module of the present application, two examples of the motor module are added below for illustration.

[0106] Example one:

[0107] The motor module 3 can adopt the motor structure different from Figure 2 as shown in Figure 7 , which can specifically include a stator first permanent magnet 111, a stator second permanent magnet 112, a stator third permanent magnet 113, a stator fourth permanent magnet 114, a motor shell 115, an internal support structure 116, a motor rotor 117, a rotor first winding 118, and a rotor second winding 119.

[0108] In example one, Figure 3 the winding 100 of the motor module 3 shown in is the rotor first winding 118 and the rotor second winding 119. The rotor of the motor module 3 is the motor rotor 117, wherein the stator first permanent magnet 111, the stator second permanent magnet 113, and the stator fourth permanent magnet 114 are used to build the magnetic field environment inside the motor, and their functions are similar to those of the first rotor permanent magnet 13 and the second rotor permanent magnet 16 shown in Figure 2 .

[0109] The flow of the new control method proposed in this example is as follows:

[0110] When the working mode is swing mode, the control module 1 is specifically configured to obtain a target low frequency signal and a carrier signal, and generate a first motor driving signal according to the target low frequency signal and the carrier signal, and input the first motor driving signal into the motor driving circuit 2.

[0111] The motor drive circuit 2 is specifically used to respond to the first motor drive signal and generate a first drive current. The first drive current is used to make the motor rotor 117 swing around the balance position with a preset first swing amplitude and a preset first swing frequency.

[0112] When the working mode is vibration mode, the control module 1 is specifically used to acquire the target high-frequency signal and carrier signal, and generate a second motor drive signal based on the target high-frequency signal and carrier signal, and input the second motor drive signal into the motor drive circuit 2;

[0113] The motor drive circuit 2 is specifically used to respond to the second motor drive signal and generate a second drive current. The second drive current is used to make the motor rotor 117 vibrate around the balance position with a preset first vibration amplitude and a preset first vibration frequency.

[0114] When the operating mode is oscillation mode, the control module 1 is specifically used to acquire the target high-frequency signal, the target low-frequency signal and the carrier signal, and superimpose the target high-frequency signal and the target low-frequency signal to obtain the target modulation signal, and generate the third motor drive signal according to the target modulation signal and the carrier signal; and input the third motor drive signal into the motor drive circuit 2.

[0115] The motor drive circuit 2 is specifically used to respond to the third motor drive signal and generate a third drive current. The third drive current is used to make the motor rotor 117 swing around the balance position with a first swing amplitude and a first swing frequency, and at the same time make the motor rotor 117 vibrate around the current swing position with a first vibration amplitude and a first vibration frequency.

[0116] It is understood that the working principles of the swing mode, vibration mode, and oscillation mode in Example 1 can be referred to the aforementioned embodiments, and will not be repeated here.

[0117] Example 2:

[0118] Motor module 3 can be adopted as follows Figure 8 The difference shown is Figure 2 The motor structure may specifically include: a stator 120, a first stator winding 121, a second stator winding 122, a first permanent magnet 123, a second permanent magnet 124, a third permanent magnet 125, a fourth permanent magnet 126, and a motor rotor 127.

[0119] In Example 2, Figure 3 The winding 100 of the motor module 3 shown is the first stator winding 121 and the second stator winding 122. The rotor of the motor module 3 is the motor rotor 127. The first permanent magnet 111, the second permanent magnet 113, and the fourth permanent magnet 114 of the stator are all used to construct the magnetic field environment inside the motor, and their function is similar to...Figure 2 The first rotor permanent magnet 13 and the second rotor permanent magnet 16 shown have similar effects.

[0120] The new control method proposed by the present application has the following flow in this example:

[0121] When the working mode is the swing mode, the control module 1 is specifically configured to obtain a target low-frequency signal and a carrier signal, and generate a first motor driving signal according to the target low-frequency signal and the carrier signal, and input the first motor driving signal into the motor driving circuit 2.

[0122] The motor driving circuit 2 is specifically configured to generate a first driving current in response to the first motor driving signal, and the first driving current is used to make the motor rotor 127 swing with the balance position as the center and with a preset first swing amplitude and a preset first swing frequency.

[0123] When the working mode is the vibration mode, the control module 1 is specifically configured to obtain a target high-frequency signal and a carrier signal, and generate a second motor driving signal according to the target high-frequency signal and the carrier signal, and input the second motor driving signal into the motor driving circuit 2.

[0124] The motor driving circuit 2 is specifically configured to generate a second driving current in response to the second motor driving signal, and the second driving current is used to make the motor rotor 127 vibrate with the balance position as the center and with a preset first vibration amplitude and a preset first vibration frequency.

[0125] When the working mode is the swing-vibration mode, the control module 1 is specifically configured to obtain a target high-frequency signal, a target low-frequency signal and a carrier signal, superimpose the target high-frequency signal and the target low-frequency signal to obtain a target modulation signal, and generate a third motor driving signal according to the target modulation signal and the carrier signal; and input the third motor driving signal into the motor driving circuit 2.

[0126] The motor driving circuit 2 is specifically configured to generate a third driving current in response to the third motor driving signal, and the third driving current is used to make the motor rotor 127 swing with the balance position as the center and with a first swing amplitude and a first swing frequency, and make the motor rotor 127 vibrate with the current swing position as the center and with a first vibration amplitude and a first vibration frequency.

[0127] It can be understood that in Example II, the control principles of the swing mode, the vibration mode and the swing-vibration mode can refer to the foregoing embodiments, which will not be described here.

[0128] It should be emphasized that, Figure 2 , Figure 7 , Figure 8The listed motor structure is only provided as an exemplary description of the control principle of the control device of the present application, and is not used to limit the structure of the motor module 3 of the present application. The motor module 3 in the embodiment of the present application is not limited to Figure 2 , Figure 7 The motor shown in Figure 8 may be all motors containing a pair of pole structures, and may also be similar motors shown in Figure 2 , Figure 7 , Figure 8 and the like.

[0129] In a specific embodiment, in a normal working state, if normal power-off, the rotor of the motor module 3 will automatically return to the balance position, and the whole process does not need to be positioned again.

[0130] In an actual application example, the operation flow of the embodiment of the present application is as shown in Figure 9 .

[0131] S100: the motor module 3 is powered on and in a standby state;

[0132] S101: receiving the motion mode input by the user, wherein the motion mode is divided into swing working mode, vibration working mode, swing-vibration working mode;

[0133] S102: when the motion mode is input to the control chip of the control module 1, the control chip generates a start signal.

[0134] S103: the control chip generates a modulation signal waveform 104 and a carrier signal 105 corresponding to the motion mode, and generates and outputs a PWM control signal according to the modulation signal waveform and the carrier signal.

[0135] S104: the motor drive circuit 2 receives the PWM control signal, controls the on-off of each bridge arm switch tube in the inverter circuit module, thereby generating a driving current in the motor winding, so that the motor rotor 14 realizes corresponding motion.

[0136] S105: when receiving the stop signal input by the user, S106 is executed;

[0137] S106: the control chip stops outputting the PWM control signal, and step S107 is executed;

[0138] S107: turn off all bridge arm switch tubes in the motor drive circuit 2, and jump to S100, so that the motor returns to the standby state.

[0139] The embodiment of the present application also provides an electric toothbrush, which comprises the control device of any one of the above embodiments.

[0140] Please refer to Figure 10The embodiment of the present application also provides a control method of the electric toothbrush, not limited to Figure 2 , Figure 7 The motor with the three structures shown in the figures can be applied to all motors with a pair of poles and can also be applied to similar motors with the structures shown in the figures. Figure 8 , Figure 2 , Figure 7 , Figure 8

[0141] The control method comprises the following steps:

[0142] 201, generating a motor driving signal corresponding to the working mode in response to the mode instruction carrying the working mode; the working mode comprises a swing mode, a vibration mode and a swing-vibration mode;

[0143] 202, inputting the motor driving signal into the motor driving circuit to enable the motor driving circuit to drive the motor module to operate in the working mode.

[0144] The embodiment generates a motor driving signal corresponding to the working mode in response to the mode instruction carrying the working mode, inputs the motor driving signal into the motor driving circuit, and enables the motor driving circuit to drive the motor module to operate in the working mode, thereby solving the problem that the prior art only relies on high-frequency vibration to achieve tooth cleaning, which is likely to miss the tooth parts to be cleaned, resulting in incomplete tooth cleaning.

[0145] In a specific embodiment, when the working mode is the swing mode, step 201 specifically comprises:

[0146] obtaining a target low-frequency signal and a carrier signal, and generating a first motor driving signal according to the target low-frequency signal and the carrier signal.

[0147] Step 202 specifically comprises:

[0148] inputting the first motor driving signal into the motor driving circuit to enable the motor driving circuit to generate a first driving current, and the first driving current is used to enable the rotor of the motor module to swing with a preset first swing amplitude and a preset first swing frequency with the balance position as the center.

[0149] In a specific embodiment, when the working mode is the swing mode, step 201 specifically comprises:

[0150] obtaining a target high-frequency signal and a carrier signal, and generating a second motor driving signal according to the target high-frequency signal and the carrier signal,

[0151] Step 202 specifically comprises:

[0152] ​The second motor driving signal is input into the motor driving circuit, so that the motor driving circuit generates a second driving current, and the second driving current is used to make the rotor of the motor module vibrate around the balance position at a preset first vibration amplitude and a preset first vibration frequency.

[0153] In one specific embodiment, when the working mode is the swing vibration mode, step 201 specifically comprises:

[0154] The target high-frequency signal, the target low-frequency signal and the carrier signal are obtained, the target high-frequency signal and the target low-frequency signal are superimposed to obtain a target modulation signal, and a third motor driving signal is generated according to the target modulation signal and the carrier signal;

[0155] Step 202 specifically comprises:

[0156] The third motor driving signal is input into the motor driving circuit, so that the motor driving circuit generates a third driving current, and the third driving current is used to make the rotor of the motor module swing around the balance position at a first swing amplitude and a first swing frequency, and simultaneously make the rotor of the motor module vibrate around the current swing position at a first vibration amplitude and a first vibration frequency.

[0157] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system, device and unit described above can refer to the corresponding process in the foregoing method embodiments, which will not be repeated here.

[0158] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other manners. For example, the device embodiments described above are only schematic; the division of the units is only a logical function division, and there can be another division manner in actual implementation; for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections between the units can be indirect couplings or communication connections through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0159] The units described as separate components can or can not be physically separate, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purposes of the embodiments.

[0160] In addition, each function unit in each embodiment of the present application can be integrated in one processing unit, or each function unit can be a separate physical existence, or two or more function units can be integrated in one processing unit. The integrated unit can be realized in the form of hardware or in the form of a software function unit.

[0161] When the integrated unit is realized in the form of a software function unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application essentially or the part that contributes to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various program code storage media.

[0162] The terms "first", "second", "third", "fourth" and the like (if any) in the description of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0163] It should also be noted that in the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0164] The above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalent features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A control device for an electric toothbrush, characterized in that, include: Motor drive circuit, motor module; The motor module includes a stator core; The motor rotor is disposed in the middle of the stator core; The stator core is provided with windings on both sides, and the motor rotor is provided with magnets around it; Alternatively, the motor rotor has windings on both sides, and the stator core is surrounded by magnets; The magnet is used to construct the magnetic field inside the motor module; The winding is connected to the output terminal of the motor drive circuit; The motor module is used to drive the brush head of the electric toothbrush to perform corresponding movements.

2. The control device according to claim 1, characterized in that, The winding includes a first winding and a second winding; the first winding and the second winding are wound in series.

3. The control device according to claim 1, characterized in that, The magnet includes a first permanent magnet and a second permanent magnet; the first permanent magnet and the second permanent magnet are magnetized in opposite directions.

4. The control device according to claim 3, characterized in that, The first permanent magnet and the second permanent magnet are one or more, and the first permanent magnet and the second permanent magnet are arranged symmetrically.

5. The control device according to claim 3, characterized in that, The first permanent magnet and the second permanent magnet are magnetized in parallel.

6. The control device according to claim 1, characterized in that, The motor drive circuit includes a DC power supply and a single-phase full-bridge inverter drive circuit.

7. The control device according to claim 6, characterized in that, The single-phase full-bridge inverter drive circuit is an H-bridge drive circuit, including a first bridge arm switch, a second bridge arm switch, a third bridge arm switch, and a fourth bridge arm switch; the connection between the first bridge arm switch and the third bridge arm switch is connected to the winding of the motor module; the connection between the second bridge arm switch and the fourth bridge arm switch is connected to the winding of the motor module.

8. A control method for an electric toothbrush, characterized in that, The control device as described in any one of claims 1-7 comprises: In response to a mode command carrying the operating mode, a motor drive signal corresponding to the operating mode is generated; According to the motor drive signal, a corresponding drive current is output to the motor drive circuit, so that the motor drive circuit drives the motor module to operate in the working mode.

9. The control method according to claim 8, characterized in that, The response carrying the mode command for the operating mode, generating a motor drive signal corresponding to the operating mode, includes: According to the mode instruction, the target signal and carrier signal corresponding to the mode instruction are obtained, and the target signal and the carrier signal are modulated to obtain a PWM signal.

10. The control method according to claim 9, characterized in that, When there are multiple target signals, the multiple target signals are superimposed and then modulated.

11. The control method according to claim 8, characterized in that, When the electric toothbrush is powered off normally, the motor rotor automatically returns to the balanced position.

12. A control device for an electric toothbrush, characterized in that, include: Control module, motor drive circuit, motor module; The control module is connected to the motor drive circuit and is used to generate a motor drive signal corresponding to the working mode, and input the motor drive signal into the motor drive circuit. The motor drive circuit is connected to the motor module; Used to respond to the motor drive signal and drive the motor module to operate in the working mode; The operating modes include one or more of the following: vibration mode, oscillation mode, and swing mode.

13. The control device according to claim 12, characterized in that, The control module is connected to the motor drive circuit and is used to generate a motor drive signal corresponding to the operating mode, including: The control module acquires a carrier signal and a target low-frequency signal and / or a target high-frequency signal. The target low-frequency signal and / or the target high-frequency signal are used as target modulation signals and modulated with the carrier signal to obtain a motor drive signal corresponding to the working mode.

14. The control device according to claim 12, characterized in that, The motor drive circuit is connected to the motor module; To respond to the motor drive signal and drive the motor module to operate in the operating mode, including: The motor drive circuit responds to the motor drive signal and generates a drive current. The drive current is used to make the motor rotor of the motor module swing around the equilibrium position, and / or make the motor rotor of the motor module vibrate around the real-time position of the motor rotor during the swing.

15. A control method for an electric toothbrush, characterized in that, The control device as described in any one of claims 12-14 comprises: In response to a mode command carrying the operating mode, a motor drive signal corresponding to the operating mode is generated; The motor drive signal is input into the motor drive circuit, causing the motor drive circuit to drive the motor module to operate in the working mode.

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