Control circuit of electric toothbrush and electric toothbrush

Abstract

The utility model provides a control circuit and electric toothbrush of electric toothbrush, control circuit of electric toothbrush includes main control circuit, battery, battery protection circuit, voltage conversion circuit, battery detection circuit, pressure detection circuit, motor drive circuit and display drive circuit, battery protection circuit connects to the input of voltage conversion circuit and the power end of motor drive circuit through battery, the output of voltage conversion circuit is connected to the power end of display drive circuit and the power end of main control circuit, the detection end of battery detection circuit is connected to battery, the output of battery detection circuit is connected to the first input of main control circuit, the output of pressure detection circuit is connected to the second input of main control circuit, the first output of main control circuit is connected to the input of motor drive circuit, the second output of main control circuit is connected to the input of display drive circuit, the utility model discloses technical scheme, can significantly improve the experience and nursing effect of user use electric toothbrush.

Description

Technical Field

[0001] This utility model relates to the field of electric toothbrush technology, and in particular to a control circuit for an electric toothbrush and an electric toothbrush. Background Technology

[0002] As an essential tool for modern oral hygiene, the core performance of electric toothbrushes relies primarily on the precision, stability, and intelligence of their control circuitry. With rising consumer demand and technological advancements, electric toothbrushes have evolved from simple mechanical vibrations into intelligent care devices integrating multiple operating modes, smart control, and health monitoring. However, existing electric toothbrush control circuits still suffer from numerous issues in terms of architectural design and functional implementation, impacting user experience.

[0003] Currently, most electric toothbrushes on the market use a simplified control circuit architecture, which mainly has the following technical problems: 1. Most electric toothbrushes lack pressure detection capabilities or rely solely on simple mechanical limits to roughly restrict brushing force, failing to accurately sense the real-time pressure applied by the user. During use, users often apply excessive pressure in pursuit of a superior cleaning effect. This not only easily damages gum tissue and tooth enamel, causing oral discomfort, but also leads to a sharp increase in the load on the sonic motor, significantly shortening the lifespan of the motor and the entire device with prolonged use. Conversely, insufficient pressure fails to achieve the desired cleaning effect, impacting the quality of oral care.

[0004] 2. Traditional electric toothbrushes have simple motor drive circuit designs, mostly using a single switch control or a fixed frequency pulse drive method. They have a single working mode and can only achieve basic vibration cleaning functions. They cannot provide differentiated vibration frequency and intensity control according to different oral care needs such as daily cleaning, gum massage, and teeth whitening, making it difficult to adapt to different users' oral conditions and personalized care needs.

[0005] 3. Traditional electric toothbrushes often use simple LED indicator lights or low-resolution LCD screens for their display modules, which display very limited information. They can only roughly indicate the power-on status or low battery level. Users cannot intuitively and clearly understand key information such as the current working mode, remaining battery level, brushing countdown, and abnormal pressure reminders, resulting in a poor user experience. Utility Model Content

[0006] This utility model proposes a control circuit and an electric toothbrush, aiming to significantly improve the user experience and care effect of using an electric toothbrush.

[0007] To achieve the above objectives, this utility model provides a control circuit for an electric toothbrush, including a main control circuit, a battery, a battery protection circuit, a voltage conversion circuit, a battery detection circuit, a pressure detection circuit, a motor drive circuit, and a display drive circuit. The positive output terminal of the battery is connected to the input terminal of the voltage conversion circuit and the power supply terminal of the motor drive circuit via the battery protection circuit. The output terminal of the voltage conversion circuit is connected to the power supply terminal of the display drive circuit and the power supply terminal of the main control circuit. The detection terminal of the battery detection circuit is connected to the positive output terminal of the battery, and the output terminal of the battery detection circuit is connected to the first input terminal of the main control circuit. The detection terminal of the pressure detection circuit is used to detect the pressure value of the brush head of the electric toothbrush, and the output terminal of the pressure detection circuit is connected to the second input terminal of the main control circuit. The first output terminal of the main control circuit is connected to the input terminal of the motor drive circuit, and the output terminal of the motor drive circuit is connected to the sonic motor of the electric toothbrush. The second output terminal of the main control circuit is connected to the input terminal of the display driving circuit, and the output terminal of the display driving circuit is connected to the display screen of the electric toothbrush.

[0008] Optionally, the battery detection circuit includes a first resistor and a second resistor; One end of the first resistor is connected to the positive output terminal of the battery, the other end of the first resistor and one end of the second resistor are connected to the first input terminal of the main control circuit, and the other end of the second resistor is grounded.

[0009] Optionally, the pressure detection circuit includes a pressure sensor, a signal amplification circuit, and a filtering circuit; The pressure sensor is located at the connection between the brush head and the handle of the electric toothbrush, and the output of the pressure sensor is connected to the second input of the main control circuit in sequence through the signal amplification circuit and the filter circuit.

[0010] Optionally, the control circuit of the electric toothbrush further includes a button switch circuit; The power supply terminal of the push-button switch circuit is connected to the output terminal of the voltage conversion circuit, and the output terminal of the push-button switch circuit is connected to the button signal input terminal of the main control circuit.

[0011] Optionally, the push-button switch circuit includes a third resistor, a first capacitor, and a push-button switch; One end of the third resistor is connected to the output terminal of the voltage conversion circuit, and the other end of the third resistor, one end of the first capacitor, and one end of the push-button switch are all connected to the button signal input terminal of the main control circuit. The other end of the push-button switch and the other end of the first capacitor are grounded.

[0012] Optionally, the control circuit of the electric toothbrush further includes a hardware reset circuit; The power supply terminal of the hardware reset circuit is connected to the output terminal of the voltage conversion circuit. The controlled terminal of the hardware reset circuit is used to receive the reset trigger signal. The output terminal of the hardware reset circuit is connected to the reset signal input terminal of the main control circuit.

[0013] Optionally, the control circuit of the electric toothbrush further includes a charging management circuit; The input terminal of the charging management circuit is connected to a USB interface, and the output terminal of the charging management circuit is connected to the positive output terminal of the battery via the battery protection circuit.

[0014] Optionally, the control circuit of the electric toothbrush further includes a wireless communication circuit; The wireless communication circuit is bidirectionally connected to the main control circuit.

[0015] Optionally, the wireless communication circuit is at least one of a Bluetooth module, a Wi-Fi module, or an NFC module.

[0016] To achieve the above objectives, the present invention also provides an electric toothbrush, the electric toothbrush including the control circuit of the electric toothbrush as described in any of the preceding claims.

[0017] The technical solution of this utility model constructs a safe and stable power supply system through a battery protection circuit and a voltage conversion circuit; it achieves real-time sensing of battery status and brushing force through a battery detection circuit and a pressure detection circuit; the main control circuit adaptively adjusts the PWM signal output to the motor drive circuit based on real-time sensing information, thereby precisely controlling the vibration intensity and mode of the sonic motor; and the display drive circuit and display screen realize the visual output of the status. This not only ensures the efficient cleaning performance driven by the sonic motor, but also significantly improves the system's power supply safety, battery durability, and user experience. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a circuit structure block diagram of one embodiment of the control circuit of the electric toothbrush of this utility model; Figure 2 for Figure 1 A circuit block diagram of one embodiment of a battery detection circuit; Figure 3 for Figure 1A circuit block diagram of one embodiment of a medium pressure detection circuit; Figure 4 This is a circuit block diagram of another embodiment of the control circuit of the electric toothbrush of this utility model; Figure 5 for Figure 4 A circuit block diagram of one embodiment of a push-button switch circuit.

[0020] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example 1 Reference Figure 1 This utility model provides a control circuit for an electric toothbrush, including a main control circuit 10, a battery 11, a battery protection circuit 12, a voltage conversion circuit 13, a battery detection circuit 14, a pressure detection circuit 15, a motor drive circuit 16, and a display drive circuit 18. The specific connection relationships are as follows: The positive output terminal of battery 11 is connected to the input terminal of voltage conversion circuit 13 and the power supply terminal of motor drive circuit 16 via battery protection circuit 12. The output terminal of voltage conversion circuit 13 is connected to the power supply terminal of display drive circuit 18 and the power supply terminal of main control circuit 10. The detection terminal of battery detection circuit 14 is connected to the positive output terminal of battery 11, and the output terminal of battery detection circuit 14 is connected to the first input terminal of main control circuit 10. The detection terminal of pressure detection circuit 15 is used to detect the pressure value of the electric toothbrush head, and the output terminal of pressure detection circuit 15 is connected to the second input terminal of main control circuit 10. The first output terminal of main control circuit 10 is connected to the input terminal of motor drive circuit 16, and the output terminal of motor drive circuit 16 is connected to the sonic motor 17 of electric toothbrush. The second output terminal of main control circuit 10 is connected to the input terminal of display drive circuit 18, and the output terminal of display drive circuit 18 is connected to the display screen 19 of electric toothbrush.

[0023] The working principle and beneficial effects of this embodiment are explained below: I. Power Supply: The battery 11 can be a rechargeable lithium battery. The positive output terminal of the battery 11 is connected to the battery protection circuit 12 to monitor the voltage, current, and temperature of the battery 11 in real time. The battery protection circuit 12 can be composed of a dedicated protection IC such as a 5306A in conjunction with external discrete components. When overcharging, over-discharging, overcurrent, or short-circuit abnormalities are detected in the battery 11, the battery protection circuit 12 immediately disconnects the circuit connection to ensure the safety of the battery 11. When the battery 11 is working normally, the output voltage of the battery 11 is divided into two paths after passing through the battery protection circuit 12: one path is sent to the voltage conversion circuit 13, which converts the output voltage of the battery 11 into a stable system operating voltage, such as 3.3V. The voltage conversion circuit 13 can be a DC-DC step-down circuit. This stable operating voltage also provides stable power to the main control circuit 10 and the display drive circuit 18; the other path is directly sent to the power supply terminal of the motor drive circuit 16. The sonic motor 17 of the electric toothbrush has a large operating current, and its rated voltage matches the battery voltage. The battery 11 directly supplies power to the motor drive circuit 16, which can reduce energy conversion loss and improve drive efficiency.

[0024] II. Regarding state perception: The battery detection circuit 14 samples the output voltage of the battery 11 in real time through a resistor voltage divider and filter network, and sends the sampled analog voltage signal to the ADC pin of the main control circuit 10. The main control circuit 10 calculates the remaining power of the battery 11 in real time based on the analog voltage signal, and accurately determines the current state of the battery 11, such as charging, fully charged, or low power, in conjunction with the charging management signal, providing a basis for intelligent power management and user prompts. At the same time, the pressure detection circuit 15 senses the pressure on the electric toothbrush head in real time and generates a corresponding pressure signal to the ADC pin of the main control circuit 10. The preset control algorithm in the main control circuit 10 processes the pressure signal in real time: when the pressure on the electric toothbrush head is detected to be within the preset pressure range, the main control circuit 10 maintains the frequency and duty cycle of the PWM signal output to the motor drive circuit 16, so that the sonic motor 17 operates stably in the currently set working mode, ensuring the cleaning effect. When the pressure applied to the electric toothbrush head exceeds a preset upper pressure threshold, the main control circuit 10 dynamically reduces the duty cycle of the output PWM signal, thereby linearly reducing the vibration intensity of the sonic motor 17. This provides tactile feedback while actively protecting gums and reducing the motor load. When the pressure applied to the electric toothbrush head falls below a preset lower pressure threshold, the main control circuit 10 can control the screen to display a prompt icon via the display drive circuit 18, or maintain the current power output but remind the user to increase the pressure to ensure effective cleaning.

[0025] At the human-computer interaction level, the main control circuit 10 integrates various data such as the battery power, brushing pressure, and timing information of the battery 11 to generate corresponding display commands and send them to the display driver circuit 18. This drives the display screen 19 to clearly and stably display information such as working mode, battery level, brushing time, and pressure reminders, providing users with intuitive status feedback.

[0026] The technical solution of this utility model establishes a safe and stable power supply system through the battery protection circuit 12 and the voltage conversion circuit 13; it realizes real-time sensing of the battery status 11 and brushing force through the battery detection circuit 14 and the pressure detection circuit 15; the main control circuit 10 adaptively adjusts the PWM signal output to the motor drive circuit 16 based on the real-time sensing information, thereby precisely controlling the vibration intensity and mode of the sonic motor 17; and the display drive circuit 18 and the display screen 19 realize the visual output of the status. This not only ensures the efficient and reliable cleaning performance driven by the sonic motor, but also significantly improves the power supply safety, battery durability and user experience of the system.

[0027] Reference Figure 2 In one embodiment, the battery detection circuit 14 includes a first resistor R1 and a second resistor R2; wherein one end of the first resistor R1 is connected to the positive output terminal Bat+ of the battery 11, the other end of the first resistor R1 and one end of the second resistor R2 are connected to the first input terminal of the main control circuit 10, and the other end of the second resistor R2 is grounded.

[0028] Specifically, the output voltage of the positive output terminal Bat+ of battery 11 is divided by a voltage divider network consisting of a first resistor R1 and a second resistor R2 connected in series. At the sampling point, i.e., at the common terminal of the first resistor R1 and the second resistor R2, a proportionally reduced voltage is generated. The main control circuit 10 continuously acquires the analog voltage value at this sampling point through its ADC pin and converts the analog voltage value into a corresponding digital voltage value using its internally integrated analog-to-digital converter module. Finally, based on the digital voltage value and the voltage division ratio determined by the resistance values ​​of the first resistor R1 and the second resistor R2, the main control circuit 10 reversely calculates the real-time voltage of battery 11 through a preset conversion relationship, thereby assessing the remaining charge status of battery 11.

[0029] Reference Figure 3 In one embodiment, the pressure detection circuit 15 includes a pressure sensor 151, a signal amplification circuit 152, and a filter circuit 153; wherein, the pressure sensor 151 is disposed at the connection between the brush head and the handle of the electric toothbrush, and the output terminal of the pressure sensor 151 is connected to the second input terminal of the main control circuit 10 in sequence via the signal amplification circuit 152 and the filter circuit 153.

[0030] Specifically, a pressure sensor 151 is located at the mechanical connection between the brush head and the handle of the electric toothbrush to directly and sensitively sense the vertical pressure transmitted by the user to the teeth and gums through the brush head. This pressure sensor 151 can be a piezoresistive or thin-film micro-pressure sensor, capable of linearly converting mechanical pressure into a weak electrical signal. Since the original electrical signal output by the pressure sensor 151 is weak and susceptible to interference, this embodiment uses a signal amplification circuit 152, such as an operational amplifier, to controllably amplify the original electrical signal output by the pressure sensor 151, boosting it to a voltage range suitable for processing by the main control circuit 10. A filter circuit 153 is used to filter out high-frequency noise introduced during signal acquisition and amplification; this filter circuit 153 is typically implemented using an RC filter.

[0031] In this embodiment, the pressure detection circuit 15 provides a reliable reference for the main control circuit 10 to achieve adaptive pressure control. Based on the electrical signal output by the pressure detection circuit 15, the main control circuit 10 accurately determines whether the brushing pressure is within the preset pressure range. Once the brushing pressure exceeds the preset range, the main control circuit 10 can adjust the PWM signal output to the motor drive circuit 16 in real time, thereby automatically reducing the vibration intensity and effectively protecting gum health while ensuring cleaning effectiveness. Furthermore, the main control circuit 10 can also simultaneously output intuitive pressure warning information on the display screen 19 through the display drive circuit 18.

[0032] Reference Figure 4 In one embodiment, the control circuit of the electric toothbrush further includes a button switch circuit 20; the power supply terminal of the button switch circuit 20 is connected to the output terminal of the voltage conversion circuit 13, and the output terminal of the button switch circuit 20 is connected to the button signal input terminal of the main control circuit 10.

[0033] The control circuit of this electric toothbrush further integrates a push-button switch circuit 20. This push-button switch circuit 20 provides users with a direct and reliable physical operating interface, serving as the interactive channel for controlling the electric toothbrush's on / off state, switching between multiple cleaning modes, and activating / deactivating various functions. Through this push-button switch circuit 20, users can conveniently operate the electric toothbrush, thereby enhancing its ease of use and human-computer interaction experience.

[0034] Optional, refer to Figure 5 The push-button switch circuit 20 includes a third resistor R3, a first capacitor C1, and a push-button switch K1. One end of the third resistor R3 is connected to the output terminal of the voltage conversion circuit 13, and the other end of the third resistor R3, one end of the first capacitor C1, and one end of the push-button switch K1 are all connected to the button signal input terminal of the main control circuit 10. The other end of the push-button switch K1 and the other end of the first capacitor C1 are grounded.

[0035] Specifically, when the push button switch K1 is not pressed, its contacts are open, and the button signal input terminal of the main control circuit 10 is pulled up to a high level through the third resistor R3; when the push button switch K1 is pressed, its contacts are closed, and the button signal input terminal of the main control circuit 10 is pulled down to a low level. At the same time, the first capacitor C1 is rapidly discharged through the push button switch K1, and when the push button switch K1 is briefly opened due to mechanical jitter, it is charged through the third resistor R3. The delay characteristics of the RC circuit are used to effectively suppress the jitter interference of the contacts, ensuring that the main control circuit 10 captures a clear and stable level transition signal.

[0036] Reference Figure 4 In one embodiment, the control circuit of the electric toothbrush further includes a hardware reset circuit 21; the power supply terminal of the hardware reset circuit 21 is connected to the output terminal of the voltage conversion circuit 13, the controlled terminal of the hardware reset circuit 21 is used to receive a reset trigger signal, and the output terminal of the hardware reset circuit 21 is connected to the reset signal input terminal of the main control circuit 10.

[0037] The electric toothbrush control circuit of this embodiment also integrates a hardware reset circuit 21. By adding the hardware reset circuit 21, the problem of the electric toothbrush system being unable to recover autonomously under complex working environments (such as power fluctuations, motor vibration interference, and abnormal program freezing) is solved, ensuring the stability and reliability of the main control circuit 10 and avoiding interruption of the brushing function or misoperation due to system failure.

[0038] The controlled terminal of the hardware reset circuit 21 is used to receive a reset trigger signal. The sources of this reset trigger signal include, but are not limited to: 1. User manual triggering: For example, if a user presses the button switch K1 in the button switch circuit 20 for a duration exceeding a preset threshold, such as a long press for 3 seconds, the button switch circuit 20 outputs a valid reset trigger signal to the controlled terminal of the hardware reset circuit 21, allowing the user to actively force a system reset. 2. System abnormal triggering: For example, when the battery protection circuit 12 detects an abnormal state in the battery 11, such as overvoltage, undervoltage, or overcurrent, it can generate a reset trigger signal. 3. When the main control circuit 10 detects internal faults such as program crashes or memory errors during operation, it can automatically generate a reset trigger signal. The reset trigger signal is transmitted to the controlled terminal of the hardware reset circuit 21, triggering the system to perform an autonomous reset to achieve fault isolation and system recovery.

[0039] Reference Figure 4 In one embodiment, the control circuit of the electric toothbrush further includes a charging management circuit 22; the input terminal of the charging management circuit 22 is connected to a USB interface, and the output terminal of the charging management circuit 22 is connected to the positive output terminal of the battery 11 via the battery protection circuit 12.

[0040] The control circuit of this electric toothbrush further integrates a charging management circuit 22 to safely and efficiently charge the built-in battery 11. The input of the charging management circuit 22 is connected to a USB interface, such as a Type-C interface, and is connected to an external power source via the USB port. The output of the charging management circuit 22 is connected to the positive input terminal of the battery 11 via a battery protection circuit 12. The charging management circuit 22 is typically composed of a dedicated lithium-ion battery charging management chip, such as the TP4056, and its peripheral components. It is used to convert the externally input power supply voltage into a constant current / constant voltage charging curve suitable for the battery 11, and implements multiple safety protections during this process, including overvoltage protection, overcurrent protection, short circuit protection, and temperature monitoring.

[0041] In one embodiment, the control circuit of the electric toothbrush further includes a wireless communication circuit (not shown); the wireless communication circuit is bidirectionally connected to the main control circuit 10.

[0042] The control circuit of the electric toothbrush in this embodiment can be further integrated with a wireless communication circuit to expand its intelligent functions. The main control circuit 10 can send data such as brushing time, working mode, pressure data, battery status, etc. to the wireless communication circuit, and receive instructions or configuration information from the wireless communication circuit.

[0043] Specifically, the wireless communication circuit can be selected from at least one of a Bluetooth module, a Wi-Fi module, or a near-field communication (NFC) module. By integrating a Bluetooth module, the electric toothbrush can pair with a dedicated application on a smartphone or tablet to achieve functions such as synchronized analysis of brushing data, personalized cleaning mode push and setting, and online firmware upgrades. Integrating a Wi-Fi module allows the toothbrush to directly connect to home or public wireless networks, enabling data synchronization and remote management via the cloud. Integrating an NFC module allows users to quickly switch modes or identify themselves using their mobile phones or NFC tags. The introduction of this wireless communication circuit transforms the electric toothbrush from an independent personal care tool into an interconnected node in a smart health ecosystem, greatly enriching the user experience and opening a new dimension of data-driven personalized oral health management.

[0044] This utility model also provides an electric toothbrush, which includes the control circuit of the electric toothbrush as described above. The detailed structure of the control circuit of this electric toothbrush can be referred to the above embodiments, and will not be repeated here. It is understood that since the electric toothbrush of this utility model uses the above-described control circuit, the embodiments of the electric toothbrush of this utility model include all the technical solutions of all embodiments of the above-described control circuit of the electric toothbrush, and the achieved technical effects are also completely the same, and will not be repeated here.

[0045] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A control circuit for an electric toothbrush, characterized in that, It includes a main control circuit, battery, battery protection circuit, voltage conversion circuit, battery detection circuit, pressure detection circuit, motor drive circuit, and display drive circuit; The positive output terminal of the battery is connected to the input terminal of the voltage conversion circuit and the power supply terminal of the motor drive circuit via the battery protection circuit. The output terminal of the voltage conversion circuit is connected to the power supply terminal of the display drive circuit and the power supply terminal of the main control circuit. The detection terminal of the battery detection circuit is connected to the positive output terminal of the battery, and the output terminal of the battery detection circuit is connected to the first input terminal of the main control circuit. The detection terminal of the pressure detection circuit is used to detect the pressure value of the brush head of the electric toothbrush, and the output terminal of the pressure detection circuit is connected to the second input terminal of the main control circuit. The first output terminal of the main control circuit is connected to the input terminal of the motor drive circuit, and the output terminal of the motor drive circuit is connected to the sonic motor of the electric toothbrush. The second output terminal of the main control circuit is connected to the input terminal of the display driving circuit, and the output terminal of the display driving circuit is connected to the display screen of the electric toothbrush.

2. The control circuit of the electric toothbrush as described in claim 1, characterized in that, The battery detection circuit includes a first resistor and a second resistor; One end of the first resistor is connected to the positive output terminal of the battery, the other end of the first resistor and one end of the second resistor are connected to the first input terminal of the main control circuit, and the other end of the second resistor is grounded.

3. The control circuit of the electric toothbrush as described in claim 1, characterized in that, The pressure detection circuit includes a pressure sensor, a signal amplification circuit, and a filtering circuit. The pressure sensor is located at the connection between the brush head and the handle of the electric toothbrush, and the output of the pressure sensor is connected to the second input of the main control circuit in sequence through the signal amplification circuit and the filter circuit.

4. The control circuit of the electric toothbrush as described in claim 1, characterized in that, The control circuit of the electric toothbrush also includes a button switch circuit. The power supply terminal of the push-button switch circuit is connected to the output terminal of the voltage conversion circuit, and the output terminal of the push-button switch circuit is connected to the button signal input terminal of the main control circuit.

5. The control circuit of the electric toothbrush as described in claim 4, characterized in that, The push-button switch circuit includes a third resistor, a first capacitor, and a push-button switch; One end of the third resistor is connected to the output terminal of the voltage conversion circuit, and the other end of the third resistor, one end of the first capacitor, and one end of the push-button switch are all connected to the button signal input terminal of the main control circuit. The other end of the push-button switch and the other end of the first capacitor are grounded.

6. The control circuit of the electric toothbrush as described in claim 1, characterized in that, The control circuit of the electric toothbrush also includes a hardware reset circuit. The power supply terminal of the hardware reset circuit is connected to the output terminal of the voltage conversion circuit. The controlled terminal of the hardware reset circuit is used to receive the reset trigger signal. The output terminal of the hardware reset circuit is connected to the reset signal input terminal of the main control circuit.

7. The control circuit of the electric toothbrush as described in claim 1, characterized in that, The control circuit of the electric toothbrush also includes a charging management circuit. The input terminal of the charging management circuit is connected to a USB interface, and the output terminal of the charging management circuit is connected to the positive output terminal of the battery via the battery protection circuit.

8. The control circuit of the electric toothbrush as described in any one of claims 1 to 7, characterized in that, The control circuit of the electric toothbrush also includes a wireless communication circuit. The wireless communication circuit is bidirectionally connected to the main control circuit.

9. The control circuit of the electric toothbrush as described in claim 8, characterized in that, The wireless communication circuit is at least one of a Bluetooth module, a Wi-Fi module, or an NFC module.

10. An electric toothbrush, characterized in that, The electric toothbrush includes the control circuit of the electric toothbrush as described in any one of claims 1 to 9.

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