Electric toothbrush inlet detection circuit

Abstract

The invention discloses an electric toothbrush inlet detection circuit, and relates to the field of toothbrushes, and the electric toothbrush inlet detection circuit comprises a toothbrush inlet detection module which is used for carrying out toothbrush inlet detection through a Doppler sensor, processing a detection signal and then sending the detection signal to an MCU main control module; the motor driving module is used for receiving the control signal of the MCU main control module and driving a motor to operate, so that the tooth brushing function of the electric toothbrush is realized; the MCU main control module is used for comprehensively controlling the circuit to work; the system has the beneficial effects that the Doppler sensor is adopted to replace a traditional multi-sensor biological characteristic sensing scheme, so that the hardware structure and the software judgment logic are greatly simplified, and the consistency and the reliability of the circuit are improved; meanwhile, due to the fact that peripheral devices are simple and high in integration level, production process cost is reduced, the internal space utilization rate is effectively improved, and economical efficiency and structural compactness are both considered on the basis that the intelligent entrance detection function is achieved.

Description

Technical Field

[0001] This invention relates to the field of toothbrushes, specifically to an electric toothbrush inlet detection circuit. Background Technology

[0002] With the widespread adoption of electric toothbrushes, users are no longer satisfied with basic cleaning functions and are demanding higher levels of intelligence, interactive experience, and energy efficiency. Traditional electric toothbrushes require manual control of the motor's start and stop, which is inconvenient, results in toothpaste splattering, and wastes energy. Therefore, ingestion detection technology has become a key innovation direction for optimizing the user experience, aiming to intelligently control the toothbrush's working status by automatically sensing whether the brush head has entered the mouth.

[0003] The mainstream implementation method on the market is biometric sensing, which uses multi-sensor fusion to make judgments based on differences in temperature, humidity, capacitance, and other characteristics inside and outside the oral cavity. This method has the following problems: 1. High hardware cost; 2. Misjudgment may be caused by the influence of biometrics; 3. Complex software nesting and complex judgment logic for different temperature and humidity conditions; 4. Complex manufacturing process and high production cost.

[0004] In summary, existing biometric sensing methods for toothbrushes suffer from high costs, susceptibility to misjudgments, complex software, and complex manufacturing processes, and therefore require improvement. Summary of the Invention

[0005] The purpose of this invention is to provide an electric toothbrush inlet detection circuit to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: An electric toothbrush inlet detection circuit includes: The toothbrush entry detection module is used to detect the toothbrush entry point using a Doppler sensor, and then sends the processed detection signal to the MCU main control module. The motor drive module is used to receive control signals from the MCU main control module, drive the motor to run, and realize the brushing function of the electric toothbrush. The MCU main control module is used for the operation of the integrated control circuit. The output of the toothbrush inlet detection module is connected to the first input of the MCU main control module, and the first output of the MCU main control module is connected to the input of the motor drive module.

[0007] As a further embodiment of the present invention: the toothbrush inlet detection module includes a Doppler sensor J1 and a sensing chip U4. The sensing chip U4 is of a certain type. The first end of the Doppler sensor J1 receives the common point VC through a resistor R25. The second end of the Doppler sensor J1 is connected to one end of a capacitor C8. The third end of the Doppler sensor J1 is grounded. The other end of the capacitor C8 is connected to one end of a resistor R26. The other end of the resistor R26 is connected to one end of a resistor R29, one end of a capacitor C9, and pin 2 of the sensing chip U4. The other end of the resistor R29 is connected to the other end of a capacitor C9 and pin 1 of the sensing chip U4. Pins 3 to 6 of the sensing chip U4 are each connected to the positive terminal BAT+ of the battery through a resistor. Pin 5 of the sensing chip U4 is grounded. Pin 6 of the sensing chip U4 is connected to the first input terminal of the MCU main control module.

[0008] As a further aspect of the present invention: the motor drive module includes a motor drive chip U3, the model of which is specified. Pins 1 and 3 of the motor drive chip U3 are connected to common points P5 and P6 (where the motor is connected) via a resistor. Pin 2 of the motor drive chip U3 is grounded. Pin 4 of the motor drive chip U3 is connected to the positive terminal BAT+ of the battery. Pins 5 and 6 of the motor drive chip U3 are connected to the first output terminal of the MCU main control module via a resistor.

[0009] As a further aspect of the present invention: the MCU main control module includes: The switching unit is used to provide on / off signals to the main control chip through switching actions. The main control unit is used to start working when it receives an open signal and stop working when it receives an close signal; during operation, it controls the indicator lights of the indicator unit to turn on and off based on the working status of the electric toothbrush; during operation, it receives the detection signal output by the toothbrush inlet detection module and outputs control signals to the motor drive module. The indicator unit is used to receive control from the main control unit and indicate the current working status of the electric toothbrush via indicator lights. The output of the toothbrush inlet detection module is connected to the first input of the main control unit, the first output of the main control unit is connected to the input of the motor drive module, the output of the switch unit is connected to the second input of the main control unit, and the second output of the main control unit is connected to the input of the indicator unit.

[0010] As a further embodiment of the present invention: the switch unit includes a button SW1, one end of the button SW1 is grounded, and the other end of the button SW1 is connected to the second input terminal of the main control unit.

[0011] As a further embodiment of the present invention: the main control unit includes a main control chip U2, the main control chip U2 is of model number, pin 9 of the main control chip U2 is connected to the output terminal of the toothbrush inlet detection module, pins 5 and 6 of the main control chip U2 are connected to the input terminal of the motor drive module, the output terminal of the switch unit is connected to pin 4 of the main control chip U2, and pins 10-13 of the main control chip U2 are connected to the input terminal of the indicator unit.

[0012] As a further embodiment of the present invention: the indicator unit includes MOSFETs Q1, Q2, Q3, and Q4, and indicator lights RGB1 and RGB2. The gate (G) of MOSFET Q1 is connected to pin 13 of the main control chip U2 via resistor R15; the gate (G) of MOSFET Q2 is connected to pin 12 of the main control chip U2 via resistor R18; the gate (G) of MOSFET Q3 is connected to pin 11 of the main control chip U2 via resistor R16; the gate (G) of MOSFET Q4 is connected to pin 10 of the main control chip U2 via resistor R24; and the drain (D) of MOSFET Q1 is connected to the indicator light via a resistor. The first terminals of LEDs RGB1 and RGB2 are connected to the second terminals of LEDs RGB1 and RGB2 respectively through a resistor. The drain of MOSFET Q2 is connected to the third terminals of LEDs RGB1 and RGB2 respectively through a resistor. The fourth, fifth, and sixth terminals of LEDs RGB1 and RGB2 are connected to the positive terminal BAT+ of the battery. The source of MOSFET Q1, the source of MOSFET Q2, and the source of MOSFET Q3 are grounded. The source of MOSFET Q4 is connected to the positive terminal BAT+ of the battery, and the drain of MOSFET Q4 is connected to the common point VC.

[0013] As a further embodiment of the present invention: the electric toothbrush inlet detection circuit further includes a charging module, which is used to connect an external charging power supply and process the voltage and current of the charging power supply to power the battery of the electric toothbrush. The output of the charging module is connected to the third input of the MCU main control module; The charging module includes a charging chip U1, model number of which is specified. Pin 4 of the charging chip U1 is connected to the negative terminal of diode D1, one end of capacitor C1, and one end of resistor R3. The other end of capacitor C1 is grounded. The other end of resistor R3 is connected to one end of resistor R6, and the other end of resistor R6 is grounded. The positive terminal of diode D1 is connected to one end of capacitor C2 and common point P1. The other end of capacitor C2 is grounded. Pin 5 of the charging chip U1 is grounded through resistor R2. Pin 2 of the charging chip U1 is grounded. Pin 3 of the charging chip U1 is connected to the positive terminal BAT+ of the battery.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention uses a Doppler sensor to replace the traditional multi-sensor biometric sensing scheme. Compared with the prior art, the present invention greatly simplifies the hardware structure and software judgment logic, and improves the consistency and reliability of the circuit. At the same time, due to the simplicity and high integration of peripheral devices, it not only reduces the production process cost, but also effectively improves the utilization rate of internal space. While realizing the intelligent entrance detection function, it takes into account both economy and structural compactness. Attached Figure Description

[0015] Figure 1 This is a circuit diagram of an electric toothbrush inlet detection circuit. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0017] Please see Figure 1 An electric toothbrush inlet detection circuit, comprising: The toothbrush entry detection module is used to detect the toothbrush entry point using a Doppler sensor, and then sends the processed detection signal to the MCU main control module. The motor drive module is used to receive control signals from the MCU main control module, drive the motor to run, and realize the brushing function of the electric toothbrush. The MCU main control module is used for the operation of the integrated control circuit. The output of the toothbrush inlet detection module is connected to the first input of the MCU main control module, and the first output of the MCU main control module is connected to the input of the motor drive module.

[0018] In this embodiment: Please refer to Figure 1 The toothbrush inlet detection module includes a Doppler sensor J1 and a sensing chip U4. The first terminal of the Doppler sensor J1 receives the common point VC through resistor R25. The second terminal of the Doppler sensor J1 is connected to one end of capacitor C8. The third terminal of the Doppler sensor J1 is grounded. The other end of capacitor C8 is connected to one end of resistor R26. The other end of resistor R26 is connected to one end of resistor R29, one end of capacitor C9, and pin 2 of sensing chip U4. The other end of resistor R29 is connected to the other end of capacitor C9 and pin 1 of sensing chip U4. Pins 3 to 6 of sensing chip U4 are each connected to the positive terminal BAT+ of the battery through a resistor. Pin 5 of sensing chip U4 is grounded. Pin 6 of sensing chip U4 is connected to the first input terminal of the MCU main control module.

[0019] When the microwave Doppler sensor J1 detects a human approaching, it outputs a signal, which is coupled to pin 2 of the microwave sensing chip U4 via capacitor C8. The signal is amplified internally by the sensing chip U4 (gain adjusted by resistors R26 and R29), and then output from pin 6 of the sensing chip U4 to the first input terminal of the MCU main control module. The common point VC introduces the operating voltage of the Doppler sensor J1, and capacitor C9 provides high-frequency filtering to ensure signal stability.

[0020] In this embodiment: Please refer to Figure 1 The motor drive module includes a motor drive chip U3. The model of the motor drive chip U3 is [model number missing]. Pins 1 and 3 of the motor drive chip U3 are connected to common points P5 and P6 (the motor is connected at P5 and P6) through a resistor, respectively. Pin 2 of the motor drive chip U3 is grounded. Pin 4 of the motor drive chip U3 is connected to the positive terminal BAT+ of the battery. Pins 5 and 6 of the motor drive chip U3 are connected to the first output terminal of the MCU main control module through a resistor, respectively.

[0021] Pins 5 and 6 of the motor driver chip U3 receive control signals from the MCU main control module and drive the motor connected to pins 1 and 3 (through common points P5 and P6) via internal logic. Pin 4 of the motor driver chip U3 is connected to the positive terminal BAT+ of the battery for power supply, and pin 2 is grounded. Resistors R21 and R22 are drive resistors used for current limiting protection.

[0022] In this embodiment: Please refer to Figure 1 The MCU main control module includes: The switching unit is used to provide on / off signals to the main control chip through switching actions. The main control unit is used to start working when it receives an open signal and stop working when it receives an close signal; during operation, it controls the indicator lights of the indicator unit to turn on and off based on the working status of the electric toothbrush; during operation, it receives the detection signal output by the toothbrush inlet detection module and outputs control signals to the motor drive module. The indicator unit is used to receive control from the main control unit and indicate the current working status of the electric toothbrush via indicator lights. The output of the toothbrush inlet detection module is connected to the first input of the main control unit, the first output of the main control unit is connected to the input of the motor drive module, the output of the switch unit is connected to the second input of the main control unit, and the second output of the main control unit is connected to the input of the indicator unit.

[0023] In this embodiment: Please refer to Figure 1 The switch unit includes a button SW1, one end of which is grounded and the other end of which is connected to the second input terminal of the main control unit.

[0024] When button SW1 is pressed, a low-level signal is sent to the main control chip U2, triggering the start or stop.

[0025] In this embodiment: Please refer to Figure 1 The main control unit includes a main control chip U2, the model of which is specified. Pin 9 of the main control chip U2 is connected to the output of the toothbrush inlet detection module. Pins 5 and 6 of the main control chip U2 are connected to the input of the motor drive module. The output of the switch unit is connected to pin 4 of the main control chip U2. Pins 10-13 of the main control chip U2 are connected to the input of the indicator unit.

[0026] Pin 9 of the main control chip U2 is connected to the output of the toothbrush inlet detection module, pins 5 and 6 are connected to the input of the motor drive module, pin 4 is connected to the switch unit, and pins 10-13 are connected to the indicator unit. The main control chip U2 comprehensively judges the input signals and outputs corresponding control commands. The main control chip U2 obtains the voltage information of the battery BAT+ through the voltage divider between resistors R4 and R13, and uses this information to determine whether the circuit should continue operating.

[0027] In this embodiment: Please refer to Figure 1 The indicator unit includes MOSFETs Q1, Q2, Q3, and Q4, and indicator lights RGB1 and RGB2. The gate (G) of MOSFET Q1 is connected to pin 13 of the main control chip U2 via resistor R15. The gate (G) of MOSFET Q2 is connected to pin 12 of the main control chip U2 via resistor R18. The gate (G) of MOSFET Q3 is connected to pin 11 of the main control chip U2 via resistor R16. The gate (G) of MOSFET Q4 is connected to pin 10 of the main control chip U2 via resistor R24. The drain (D) of MOSFET Q1 is connected to indicator lights RGB1 and RGB2 via resistors. The first terminal of indicator light RGB2 and the drain of MOSFET Q2 are connected to the second terminals of indicator lights RGB1 and RGB2 respectively through a resistor. The drain of MOSFET Q3 is connected to the third terminals of indicator lights RGB1 and RGB2 respectively through a resistor. The fourth, fifth, and sixth terminals of indicator lights RGB1 and RGB2 are connected to the positive terminal BAT+ of the battery. The source of MOSFET Q1, the source of MOSFET Q2, and the source of MOSFET Q3 are grounded. The source of MOSFET Q4 is connected to the positive terminal BAT+ of the battery, and the drain of MOSFET Q4 is connected to the common point VC.

[0028] Pins 11 to 13 of the main control chip U2 control the conduction of MOSFETs Q1 to Q3 via resistors R15, R18, and R16, respectively, thus controlling the conduction circuits of indicator lights RGB1 and RGB2, thereby illuminating LEDs of different colors to display the current status of the toothbrush. MOSFET Q4 controls the power supply to the common point VC, providing the operating voltage for the Doppler sensor J1. MOSFETs Q1 to Q3 are NMOS transistors, and MOSFET Q4 is a PMOS transistor.

[0029] In this embodiment: Please refer to Figure 1 The electric toothbrush inlet detection circuit also includes a charging module, which is used to connect an external charging power supply and process the voltage and current of the charging power supply to power the battery of the electric toothbrush. The output of the charging module is connected to the third input of the MCU main control module; The charging module includes a charging chip U1, model number of which is specified. Pin 4 of the charging chip U1 is connected to the negative terminal of diode D1, one end of capacitor C1, and one end of resistor R3. The other end of capacitor C1 is grounded. The other end of resistor R3 is connected to one end of resistor R6, and the other end of resistor R6 is grounded. The positive terminal of diode D1 is connected to one end of capacitor C2 and common point P1. The other end of capacitor C2 is grounded. Pin 5 of the charging chip U1 is grounded through resistor R2. Pin 2 of the charging chip U1 is grounded. Pin 3 of the charging chip U1 is connected to the positive terminal BAT+ of the battery.

[0030] When an external power supply is connected to P1, the voltage is filtered by diode D1 and capacitor C2 and then sent to pin 4 of charging chip U1. Simultaneously, a voltage divider via resistors R3 and R6 sends a detection signal to pin 3 of main control chip U2. Main control chip U2 enables charging chip U1, and the input voltage begins charging the battery through charging chip U1. Resistor R2 is used to set the charging current. In the diagram, common points P1 and P4 are the positive and negative terminals for charging, and common points P5 and P6 are the motor drive ports. Common points P2 and P3 are the positive and negative terminals of the battery input.

[0031] The working principle of this invention is as follows: the toothbrush inlet detection module is used to detect the toothbrush inlet using a Doppler sensor, and sends the processed detection signal to the MCU main control module; the motor drive module is used to receive the control signal from the MCU main control module, drive the motor to run, and realize the electric toothbrush brushing function; the MCU main control module is used to control the operation of the integrated control circuit.

[0032] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and not restrictive.

[0033] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An electric toothbrush inlet detection circuit, characterized in that, The electric toothbrush inlet detection circuit includes: The toothbrush entry detection module is used to detect the toothbrush entry point using a Doppler sensor, and then sends the processed detection signal to the MCU main control module. The motor drive module is used to receive control signals from the MCU main control module, drive the motor to run, and realize the brushing function of the electric toothbrush. The MCU main control module is used for the operation of the integrated control circuit. The output of the toothbrush inlet detection module is connected to the first input of the MCU main control module, and the first output of the MCU main control module is connected to the input of the motor drive module.

2. The electric toothbrush inlet detection circuit according to claim 1, characterized in that, The toothbrush inlet detection module includes a Doppler sensor J1 and a sensing chip U4. The first terminal of the Doppler sensor J1 receives the common point VC through resistor R25. The second terminal of the Doppler sensor J1 is connected to one end of capacitor C8. The third terminal of the Doppler sensor J1 is grounded. The other end of capacitor C8 is connected to one end of resistor R26. The other end of resistor R26 is connected to one end of resistor R29, one end of capacitor C9, and pin 2 of sensing chip U4. The other end of resistor R29 is connected to the other end of capacitor C9 and pin 1 of sensing chip U4. Pins 3 to 6 of sensing chip U4 are each connected to the positive terminal BAT+ of the battery through a resistor. Pin 5 of sensing chip U4 is grounded. Pin 6 of sensing chip U4 is connected to the first input terminal of the MCU main control module.

3. The electric toothbrush inlet detection circuit according to claim 1, characterized in that, The motor drive module includes a motor drive chip U3. The model of the motor drive chip U3 is [model number missing]. Pins 1 and 3 of the motor drive chip U3 are connected to common points P5 and P6 respectively through a resistor. Pin 2 of the motor drive chip U3 is grounded. Pin 4 of the motor drive chip U3 is connected to the positive terminal BAT+ of the battery. Pins 5 and 6 of the motor drive chip U3 are connected to the first output terminal of the MCU main control module through a resistor.

4. The electric toothbrush inlet detection circuit according to claim 1, characterized in that, The MCU main control module includes: The switching unit is used to provide on / off signals to the main control chip through switching actions. The main control unit is used to start working when it receives an open signal and stop working when it receives an close signal; during operation, it controls the indicator lights of the indicator unit to turn on and off based on the working status of the electric toothbrush; during operation, it receives the detection signal output by the toothbrush inlet detection module and outputs control signals to the motor drive module. The indicator unit is used to receive control from the main control unit and indicate the current working status of the electric toothbrush via indicator lights. The output of the toothbrush inlet detection module is connected to the first input of the main control unit, the first output of the main control unit is connected to the input of the motor drive module, the output of the switch unit is connected to the second input of the main control unit, and the second output of the main control unit is connected to the input of the indicator unit.

5. The electric toothbrush inlet detection circuit according to claim 4, characterized in that, The switch unit includes a button SW1, one end of which is grounded and the other end of which is connected to the second input terminal of the main control unit.

6. The electric toothbrush inlet detection circuit according to claim 4, characterized in that, The main control unit includes a main control chip U2. The model of the main control chip U2 is [model number missing]. Pin 9 of the main control chip U2 is connected to the output of the toothbrush inlet detection module. Pins 5 and 6 of the main control chip U2 are connected to the input of the motor drive module. The output of the switch unit is connected to pin 4 of the main control chip U2. Pins 10-13 of the main control chip U2 are connected to the input of the indicator unit.

7. The electric toothbrush inlet detection circuit according to claim 6, characterized in that, The indicator unit includes MOSFETs Q1, Q2, Q3, and Q4, and indicator lights RGB1 and RGB2. The gate (G) of MOSFET Q1 is connected to pin 13 of the main control chip U2 via resistor R15. The gate (G) of MOSFET Q2 is connected to pin 12 of the main control chip U2 via resistor R18. The gate (G) of MOSFET Q3 is connected to pin 11 of the main control chip U2 via resistor R16. The gate (G) of MOSFET Q4 is connected to pin 10 of the main control chip U2 via resistor R24. The drain (D) of MOSFET Q1 is connected to indicator lights RGB1 and RGB2 via resistors. The first terminal of indicator light RGB2 and the drain of MOSFET Q2 are connected to the second terminals of indicator lights RGB1 and RGB2 respectively through a resistor. The drain of MOSFET Q3 is connected to the third terminals of indicator lights RGB1 and RGB2 respectively through a resistor. The fourth, fifth, and sixth terminals of indicator lights RGB1 and RGB2 are connected to the positive terminal BAT+ of the battery. The source of MOSFET Q1, the source of MOSFET Q2, and the source of MOSFET Q3 are grounded. The source of MOSFET Q4 is connected to the positive terminal BAT+ of the battery, and the drain of MOSFET Q4 is connected to the common point VC.

8. The electric toothbrush inlet detection circuit according to any one of claims 1 to 7, characterized in that, The electric toothbrush inlet detection circuit also includes a charging module, which is used to connect an external charging power supply and process the voltage and current of the charging power supply to power the battery of the electric toothbrush. The output of the charging module is connected to the third input of the MCU main control module; The charging module includes a charging chip U1, model number of which is specified. Pin 4 of the charging chip U1 is connected to the negative terminal of diode D1, one end of capacitor C1, and one end of resistor R3. The other end of capacitor C1 is grounded. The other end of resistor R3 is connected to one end of resistor R6, and the other end of resistor R6 is grounded. The positive terminal of diode D1 is connected to one end of capacitor C2 and common point P1. The other end of capacitor C2 is grounded. Pin 5 of the charging chip U1 is grounded through resistor R2. Pin 2 of the charging chip U1 is grounded. Pin 3 of the charging chip U1 is connected to the positive terminal BAT+ of the battery.

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