Low-voltage electric toothbrush

Abstract

The utility model discloses a low-voltage electric toothbrush, which comprises a low-voltage motor, an electric toothbrush head, a control circuit, a pair of magnetic coding sensors, a toothbrush body, a charging interface and a battery, and the electric toothbrush head is detachably connected with a motor shaft of the low-voltage motor and is driven by the low-voltage motor and controlled by the control circuit. The low-voltage motor performs sweeping vibration motion in the circumferential direction around a motor shaft of the low-voltage motor, the low-voltage motor is electrically connected with the control circuit through the pair of magnetic coding sensors, the pair of magnetic coding sensors are arranged on the side, away from the electric toothbrush head, of the low-voltage motor, and the battery and the low-voltage motor are arranged in the toothbrush body in a sleeved mode. The control circuit is arranged in the toothbrush body, and the charging interface is arranged on the side, away from the toothbrush head, of the toothbrush body and electrically connected with the control circuit. The technical problem that an existing electric toothbrush with the voltage of 3.7 V is poor in cleaning capacity can be solved. And the technical problems of short endurance time and high price of the existing 7.4 V electric toothbrush are solved.

Description

Technical Field

[0001] This utility model belongs to the field of oral care technology, and more specifically, relates to a low-pressure electric toothbrush. Background Technology

[0002] Electric toothbrushes integrate a DC motor and a dedicated driver. The driver controls the motor to drive the bristles in rapid motion to clean teeth. Electric toothbrushes are mainly categorized into three types based on their rapid motion: rotating bristles, high-frequency vibration, and combined sweeping and vibrating. The combined sweeping and vibrating type uses a technique similar to "Bass brushing," offering a stronger cleaning effect compared to the other two methods. Due to cost constraints, current combined sweeping and vibrating toothbrushes use a grooved brushless motor as their power source. Because of the inherent characteristics of motors, they produce some low-to-mid-frequency noise at low speeds. However, current solutions and products have not effectively filtered out this noise, resulting in significant noise during brushing and greatly impacting the user experience.

[0003] The voltage levels used in current electric toothbrushes are mainly 3.7V and 7.4V. The 3.7V voltage scheme is mainly found in rotary and high-frequency vibration electric toothbrushes, but the cleaning power of this type of electric toothbrush is not strong. The 7.4V voltage scheme is mainly found in electric toothbrushes with integrated sweeping and vibration, but due to the high voltage, the power loss of the MOS switch is large, resulting in a short battery life and high price. Utility Model Content

[0004] In view of the above-mentioned defects or improvement needs of the existing technology, this utility model provides a low-voltage electric toothbrush. Its purpose is to solve the technical problems of weak cleaning power of existing 3.7V electric toothbrushes and the technical problems of high power loss of MOS switches in existing 7.4V electric toothbrushes, which result in short battery life and high price.

[0005] To achieve the above objectives, according to one aspect of the present invention, a low-voltage electric toothbrush is provided, comprising a low-voltage motor, an electric toothbrush head, a control circuit, a pair of magnetic encoder sensors, a toothbrush body, a charging interface, and a battery. The electric toothbrush head is detachably connected to the motor shaft of the low-voltage motor and performs a circumferential sweeping motion around the motor shaft of the low-voltage motor under the control of the drive and control circuit of the low-voltage motor.

[0006] The low-voltage motor is electrically connected to the control circuit via a pair of magnetic encoder sensors.

[0007] A pair of magnetic coded sensors are positioned on the side of the low-voltage motor away from the electric toothbrush head;

[0008] The battery and low-voltage motor are housed inside the toothbrush body;

[0009] The control circuit is located inside the toothbrush body;

[0010] The charging port is located on the side of the toothbrush body away from the brush head and is electrically connected to the control circuit.

[0011] Preferably, the rated operating voltage of the low-voltage motor is 3.7V or +5V;

[0012] The magnetic coding sensor uses a Hall sensor;

[0013] The specific model of the magnetic coded sensor is the linear Hall effect sensor MT9103;

[0014] The charging interface uses a Type-C charging interface with an input voltage of +5V.

[0015] The battery's output voltage is +3.7V.

[0016] Preferably, the control circuit includes a microcontroller (MCU) module, a human-machine interface module, a power supply circuit, a motor drive module, a status indication module, a triaxial accelerometer module, and a signal sampling module.

[0017] The MCU module is electrically connected to the human-machine interaction module, the motor drive module, the status indication module, the triaxial accelerometer module, and the signal sampling module, respectively.

[0018] The power supply circuit is electrically connected to the MCU module, human-machine interaction module, motor drive module, and status indication module;

[0019] The signal sampling module is also electrically connected to the motor drive module.

[0020] Preferably, the input voltage of the MCU module is +3.3V;

[0021] The power supply circuit has an input voltage of +3.7V and output voltages of +5V and +3.3V.

[0022] Preferably, the human-computer interaction module includes a first button, a third field-effect transistor, a sixth diode, a fifteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-third resistor, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a tenth capacitor, and an eleventh capacitor;

[0023] One end of the first button is connected to the DC bus of the motor drive module, and the other end outputs the button status signal to the MCU module through the nineteenth resistor;

[0024] One end of the tenth capacitor is connected to the button status signal, and the other end is grounded;

[0025] One end of the 27th resistor is connected to the +5V DC voltage signal output by the charging module, one end of the 25th resistor is connected to the power status signal, and the other ends of the 27th and 25th resistors are connected to the button status signal through the 23rd resistor, grounded through the filter circuit composed of the 26th resistor and the 11th capacitor, and connected to the gate of the 3rd field-effect transistor through the 6th transistor and the 20th resistor.

[0026] Preferably, the charging module includes a power management chip, a third resistor, a second capacitor, a third capacitor, and a fifth capacitor;

[0027] The specific model of the battery management chip is TP4056;

[0028] The battery management chip's fourth and eighth pins receive the +5V DC voltage output from the charging interface, the third and ninth pins are grounded, the second pin is grounded through the third resistor, the seventh pin outputs the battery charging signal and connects to the MCU module, the fourth pin is grounded through the fifth capacitor, and the fifth pin is grounded through the second and third capacitors.

[0029] Preferably, the power supply circuit includes a boost module and a buck module.

[0030] The boost module includes a boost chip, a first diode, a first inductor, a fourth resistor, a sixth capacitor, a seventh capacitor, and a ninth capacitor;

[0031] The input voltage from the battery is connected to the fifth pin of the boost chip through the seventh capacitor and the first inductor. The fifth pin of the boost chip is also connected to the first pin of the boost chip through the first diode, and grounded through the fourth resistor and the ninth capacitor.

[0032] The fourth pin of the boost chip is grounded, the third pin is left floating, the second pin is connected to the first pin, and the sixth pin outputs a +5V DC voltage.

[0033] The step-down module includes a step-down chip, a fifth inductor, a twenty-third capacitor, a twenty-fourth capacitor, a twenty-eighth capacitor, and a thirtieth capacitor;

[0034] The +5V voltage is simultaneously input to the first and third pins of the step-down chip after passing through the fifth inductor and the twenty-eighth capacitor. One end of the twenty-eighth capacitor is connected to the first pin, and the other end is connected to the second pin and grounded.

[0035] The fourth pin of the step-down chip is grounded through the thirtieth capacitor, and the fifth pin outputs a +3.3V DC voltage after being regulated and filtered by the twenty-third and twenty-fourth capacitors.

[0036] Preferably, the motor drive module includes a U-phase drive module, a V-phase drive module, and a W-phase drive module;

[0037] The U-phase drive module includes a first drive chip, a first field-effect transistor, a ninth resistor, an eleventh resistor, a twelfth resistor, and a DC bus;

[0038] The specific model of the first driver chip is KS3337MA. The third pin of the first driver chip is connected to the positive terminal of the DC bus, and the positive and negative terminals of the DC bus are connected to the positive and negative terminals of the battery, respectively.

[0039] The fourth pin of the first driver chip is connected to the positive terminal of the DC bus through the eleventh resistor. The fifth, sixth, seventh and eighth pins are connected to the U phase of the low-voltage motor. The second pin is connected to the MCU module through the twelfth resistor. The first pin is connected to the signal sampling module.

[0040] The specific model of the first field-effect transistor is 2N7002T. Its third pin is connected to the fourth pin of the first driver chip through the ninth resistor. The first pin is connected to the MCU module, and the second pin is grounded.

[0041] The signal sampling module includes a U-phase signal sampling module, a V-phase signal sampling module, and a W-phase signal sampling module, which are respectively connected to the U-phase, V-phase, and W-phase drive modules of the motor drive module;

[0042] The U-phase signal sampling module includes a thirteenth resistor, a sixteenth resistor, a fifty-first resistor, and a twenty-fifth capacitor;

[0043] The RC filter circuit consisting of the thirteenth resistor, the sixteenth resistor, and the twenty-fifth capacitor is connected to the MCU module;

[0044] The fifty-first resistor is connected to the MCU module.

[0045] Preferably, the status indication module includes a first LED, a second LED, a third LED, a fourth LED, a fifth LED, a forty-second resistor, a forty-third resistor, a forty-fourth resistor, and a thirty-fourth resistor;

[0046] One end of the first LED is connected to resistors 42, 43, and 34, and the other end is connected to the second, third, fourth, and fifth LEDs through resistor 44.

[0047] Preferably, the triaxial accelerometer module includes a first triaxial accelerometer chip, a first resistor, a second resistor, a thirty-sixth resistor, a fortieth resistor, a thirty-eighth capacitor, a forty-third capacitor, and a forty-fourth capacitor;

[0048] The specific model of the first triaxial accelerometer chip is SC7A20TR. Its second and twelfth pins are connected to the MCU module and are respectively connected to a +3.3V DC voltage through the fortieth and thirty-sixth resistors. The third and tenth pins are respectively connected to a +3.3V DC voltage through the thirty-eighth capacitor and the first resistor. The seventh, eighth and ninth pins form a voltage regulator and filter circuit. The fourth pin is grounded through the second resistor.

[0049] In summary, compared with the prior art, the above-described technical solution conceived by this utility model can achieve the following beneficial effects:

[0050] 1. Because this utility model uses a low-voltage motor to drive the electric toothbrush head and uses a control circuit to control the electric toothbrush head to perform sweeping and vibrating motion, it has two major functions: high-frequency vibration of the brush head to clean teeth widely and large-amplitude sweeping brushing to clean teeth deeply, thus achieving truly effective cleaning of teeth.

[0051] 2. Because this utility model uses a signal sampling module with built-in RC filtering function, it can filter out high-frequency signals contained in the control signal, thereby reducing the noise when the motor is working, and thus ensuring that the control circuit outputs a sine wave control signal. The motor torque fluctuation control is better, the noise is lower, and it can bring users a comfortable user experience with extremely low noise.

[0052] 3. Since this utility model uses a 3.7V low-voltage motor and a low-voltage control circuit, it can be powered by a single high-capacity battery. This improves the battery life of the electric toothbrush, reduces the number of components used for power management, and lowers costs. Furthermore, the low cost of the control circuit further reduces manufacturing costs. Attached Figure Description

[0053] Figure 1 This is a circuit block diagram of the low-voltage electric toothbrush of this utility model;

[0054] Figure 2 This is a circuit diagram of the human-computer interaction module in this utility model;

[0055] Figure 3 This is the circuit diagram of the charging module of this utility model;

[0056] Figure 4 This is the circuit diagram of the power supply circuit of this utility model, wherein... Figure 4 (a) is a boost module. Figure 4 (b) is a step-down module;

[0057] Figure 5 This is a circuit diagram of the status indication module of this utility model;

[0058] Figure 6This is a circuit diagram of the motor drive module of this utility model, wherein... Figure 6 (a) is the W-phase drive module. Figure 6 (b) is the V-phase drive module. Figure 6 (c) is the U-phase drive module;

[0059] Figure 7 This is the circuit diagram of the triaxial acceleration sensor module of this utility model. Detailed Implementation

[0060] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. Furthermore, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0061] It should be understood that, as used in this specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or other sets.

[0062] Similarly, the terms "upper," "lower," "front," "back," "left," "right," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0063] As used in this article, the terms “installation,” “electrical connection,” and “connection” should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct electrical connections or indirect electrical connections through an intermediate medium.

[0064] As used in this article, the term "clockwise rotation" refers to rotating the toothbrush head clockwise along the axis of the toothbrush or the motor when viewed from the perspective of the electric toothbrush head. The term "counterclockwise rotation" is similar.

[0065] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0066] The present invention will now be described in more detail with reference to specific embodiments thereof.

[0067] like Figure 1 As shown, this utility model provides a low-voltage electric toothbrush, including a low-voltage motor 1, an electric toothbrush head 2, a control circuit 3, a pair of magnetic encoder sensors 4, a toothbrush body 5, a charging interface 6, and a battery 7.

[0068] The electric toothbrush head 2 is detachably connected to the motor shaft of the low-voltage motor 1, and under the control of the drive and control circuit 3 of the low-voltage motor 1, it performs a circumferential sweeping motion around the motor shaft of the low-voltage motor 1.

[0069] The low-voltage motor 1 is electrically connected to the control circuit 3 via a pair of magnetic encoder sensors 4.

[0070] A pair of magnetic encoder sensors 4 are disposed on the side of the low-voltage motor 1 away from the electric toothbrush head 2. In this embodiment, the magnetic encoder sensors 4 are Hall sensors. The battery 7 and the low-voltage motor 1 are housed inside the toothbrush body 5. The control circuit 3 is disposed inside the toothbrush body 5. The charging interface 6 is disposed on the side of the toothbrush body away from the brush head and is electrically connected to the control circuit 3 (specifically, the charging module 38 in the control circuit 3).

[0071] like Figure 6 As shown, the control circuit of this utility model includes a microcontroller unit (MCU) module 31, a human-machine interaction module 32, a power supply circuit 33, a motor drive module 34, a status indication module 35, a triaxial accelerometer sensor module 36, and a signal sampling module 37.

[0072] The MCU module 31 is electrically connected to the human-machine interface module 32, the motor drive module 34, the status indication module 35, the triaxial accelerometer sensor module 36, and the signal sampling module 37. The power supply circuit 33 is also electrically connected to the MCU module 31, the human-machine interface module 32, the motor drive module 34, and the status indication module 35. The signal sampling module 37 is also electrically connected to the motor drive module 34. The input voltage of the MCU module 31 is +3.3V, the input voltage of the power supply circuit 33 is +3.7V, and the output voltages are +5V and +3.3V.

[0073] In one embodiment, the rated operating voltage of the low-voltage motor is +3.7V, and the motor drive module 34 that controls the motor is powered by the battery 7, with the positive and negative terminals of its DC bus connected to the positive and negative terminals of the battery 7, respectively.

[0074] In another embodiment, the rated operating voltage of the low-voltage motor is +5V, and the motor drive module 34 that controls the motor is powered by +5V.

[0075] In this utility model, the specific model of the magnetic encoder sensor 4 is the linear Hall MT9103; the charging interface 6 adopts a type-C charging interface with an input voltage of +5V, which is convenient for charging and does not require distinguishing between the front and back sides during charging, thus improving ease of use and being low-carbon and environmentally friendly; the output voltage of the battery 7 is +3.7V.

[0076] The specific model of MCU module 31 is the LCM32F037K6U8 chip manufactured by Hangzhou Lingxin Microelectronics Co., Ltd.

[0077] like Figure 2 As shown, the human-computer interaction module 32 includes a first button S1 (which can also be a button with a display screen), a third field-effect transistor Q3, a sixth diode Q3, a fifteenth resistor R15, a nineteenth resistor R19, a twentieth resistor R20, a twenty-third resistor R23, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a tenth capacitor C10, and an eleventh capacitor C11. One end of the first button S1 is connected to the DC bus of the motor drive module 34, and the other end outputs a button status signal to the MCU module 31 through the nineteenth resistor R19. One end of the tenth capacitor C10 is connected to the button status signal, and the other end is grounded. One end of the 27th resistor R27 is connected to the +5V DC voltage signal output by the charging module. One end of the 25th resistor R25 is connected to the power status signal. The other ends of the 27th resistor R27 and the 25th resistor R25 are connected to the button status signal through the 23rd resistor R23 on one hand, and grounded through the filter circuit composed of the 26th resistor R26 and the 11th capacitor C11 on the other hand. They are also connected to the gate of the 3rd field-effect transistor Q3 through the 6th transistor Q6 and the 20th resistor R20.

[0078] like Figure 3 As shown, the charging module 38 includes a power management chip, a third resistor R3, a second capacitor C2, a third capacitor C3, and a fifth capacitor C5. The specific model of the battery management chip is TP4056. Its fourth and eighth pins input the +5V DC voltage of the charging interface 6. The output voltage of the fifth pin is used to charge the battery 7 and to provide DC operating voltage to the DC bus of the motor drive module 34. The third and ninth pins are grounded, the second pin is grounded through the third resistor R3, and the seventh pin outputs a battery charging signal connected to the MCU module 31. The fourth pin is grounded through the fifth capacitor C5, which plays a role in voltage regulation. The voltage output of the fifth pin is used for voltage regulation and filtering through the second capacitor C2 and the third capacitor C3, resulting in lower voltage ripple and providing a prerequisite for the low-noise performance of the electric toothbrush.

[0079] Power supply circuit 33 includes Figure 4 (a) shows the boost module and Figure 4 (b) shows the step-down module.

[0080] The boost module includes a boost chip, a first diode D1, a first inductor L1, a fourth resistor R4, a sixth capacitor C6, a seventh capacitor C7, and a ninth capacitor C9. The input voltage from battery 7 is connected to the fifth pin of the boost chip through the seventh capacitor C7 and the first inductor L1. The fifth pin of the boost chip is also connected to the first pin of the boost chip through the first diode D1, and grounded through the fourth resistor R4 and the ninth capacitor C9. The fourth pin of the boost chip is grounded, the third pin is floating, the second pin is connected to the first pin, and a +5V DC voltage is output through the sixth pin.

[0081] The step-down module includes a step-down chip, a fifth inductor L5, a twenty-third capacitor C23, a twenty-fourth capacitor C24, a twenty-eighth capacitor C28, and a thirtieth capacitor C30. A +5V voltage is simultaneously input to the first and third pins of the step-down chip after passing through the fifth inductor L5 and the twenty-eighth capacitor C28. One end of the twenty-eighth capacitor C28 is connected to the first pin, and the other end is connected to the second pin and grounded. The fourth pin is grounded through the thirtieth capacitor C30. The fifth pin outputs a +3.3V DC voltage after being regulated and filtered by the twenty-third and twenty-fourth capacitors C23 and C24.

[0082] As shown, the motor drive module 34 includes Figure 6 (a) shows the W-phase drive module, such as Figure 6 (b) shows the V-phase drive module and as shown in the figure. Figure 6 (c) shows the U-phase drive module;

[0083] The U-phase drive module includes a first drive chip, a first field-effect transistor Q1, a ninth resistor R9, an eleventh resistor R11, a twelfth resistor R12, and a DC bus.

[0084] The first driver chip is specifically model KS3337MA. Its third pin is connected to the positive terminal of the DC bus, and its fourth pin is connected to the positive terminal of the DC bus via resistor R11. Pins 5, 6, 7, and 8 are connected to phase U of the low-voltage motor 1. Its second pin is connected to the MCU module 31 via resistor R12, and its first pin is connected to the signal sampling module 37. The first field-effect transistor Q1 is specifically model 2N7002T. Its third pin is connected to the fourth pin of the first driver chip via resistor R9, its first pin is connected to the MCU module 31, and its second pin is grounded. The first pin of the first field-effect transistor and the second pin of the first driver chip respectively receive complementary PWM control signals from the MCU module 31 to control phase U of the motor 1.

[0085] The V-phase drive module and the W-phase drive module have the same function as the U-phase drive module. Together, they constitute the motor drive module and the signal sampling module 37 to drive the motor and provide the MCU module 31 with the current and voltage closed-loop signals required for motor control.

[0086] In this utility model, the signal sampling module 37 includes U-phase, V-phase, and W-phase signal sampling modules, which are respectively connected to the U-phase, V-phase, and W-phase drive modules of the motor drive module 34.

[0087] The U-phase signal sampling module includes a thirteenth resistor R13, a sixteenth resistor R16, a fifty-first resistor R51, and a twenty-fifth capacitor C25. The RC filter circuit composed of the thirteenth resistor, the sixteenth resistor, and the twenty-fifth capacitor outputs a pair of differential signals, and outputs a phase current sampling signal through the fifty-first resistor R51. Both the differential signal and the phase current sampling signal are connected to the MCU module 31.

[0088] like Figure 5 As shown, the status indicator module 35 includes a first LED, a second LED, a third LED, a fourth LED, a fifth LED, a forty-second resistor R42, a forty-third resistor R43, a forty-fourth resistor R44, and a thirty-fourth resistor R34. The first LED is a tri-color changing LED, which, together with the forty-second, forty-third, and thirty-fourth resistors, indicates the power status. The second, third, fourth, and fifth LEDs, together with the forty-fourth resistor, indicate the electric toothbrush mode status. One end of the first LED is connected to the forty-second, forty-third, and thirty-fourth resistors R42 and R43, and the other end is connected to the second, third, fourth, and fifth LEDs through the forty-fourth resistor R44.

[0089] like Figure 7 As shown, the triaxial accelerometer module 36 includes a first triaxial accelerometer chip, a first resistor R1, a second resistor R2, a thirty-sixth resistor R36, a fortieth resistor R40, a thirty-eighth capacitor C38, a forty-third capacitor C43, and a forty-fourth capacitor C44. The first triaxial accelerometer chip is specifically model SC7A20TR. Its second and twelfth pins are connected to the MCU module 31 and are respectively connected to a +3.3V DC voltage through the fortieth resistor R40 and the thirty-sixth resistor R36. The third and tenth pins are respectively connected to a +3.3V DC voltage through the thirty-eighth capacitor C38 and the first resistor R1. The seventh, eighth, and ninth pins form a voltage regulator and filter circuit, and the fourth pin is grounded through the second resistor R2.

[0090] The working principle of this utility model is as follows:

[0091] First, a 5V DC voltage is input to the control circuit 3 inside the toothbrush body 5 through the charging interface 6 (Type-C interface). The charging module 38 outputs a fixed 4.2V DC voltage to charge the battery 7. The charging module 38 also provides protection against battery short circuits, overcurrent during charging and discharging, and overcharge. During charging, the MCU module 31 reads the charging status of the charging module 38 in real time and outputs the charging status to the status indicator module 35, displaying the charging status through LED flashing or color changes. When the battery 7 voltage is below +3V, it is in a depleted state; when it reaches +4.2V DC, it is fully charged. In the absence of charging, during charging, or when charging has stopped, the power supply circuit 33 receives the input voltage from the battery 7 or the charging module 38, performs boost and buck processing, and outputs +3.3V and +5V DC voltages. The MCU module 31, the human-machine interface module 32, the triaxial accelerometer module 35, and the magnetic encoder sensor are all powered by +3.3V DC, while the signal sampling module 37 is powered by +5V DC. The motor drive module 34 is powered by the +3.7V DC voltage of the battery 7.

[0092] Secondly, once all modules are powered normally, the magnetic encoder sensor 4 acquires the position (or angle) of the low-voltage motor 1's shaft relative to the zero position (i.e., the position of the motor shaft when the toothbrush bristles are perpendicular to the button side of the toothbrush body 5), and transmits this information in real time to the MCU module 31 for signal sampling and position calculation, enabling the MCU module 31 to complete closed-loop control of the low-voltage motor 1. When the human-machine interface module 32 receives an electric toothbrush action command, the program code in the MCU module 31 begins to run normally, and acquires the position of the low-voltage motor 1's shaft in real time. It then controls the motor drive module 34 to drive the low-voltage motor 1 to move according to the command, thereby driving the toothbrush head to perform the brushing action. At the same time, the status indicator module 35 displays the corresponding status.

[0093] When the human-computer interaction module 32 receives a long press signal from the electric toothbrush button while the electric toothbrush is off, the electric toothbrush exits the off mode and enters a standby and stops moving state. The toothbrush head 2 rotates to the zero position in a circular motion, and at the same time, the status indicator module 35 only lights up the power indicator light.

[0094] When the human-computer interaction module 32 receives a short-press button signal from the electric toothbrush in the standby and stopped state, the MCU module 31 takes the brushing mode (one of the four preset modes) before the last stop as the current brushing mode, controls the motor drive module 34 to drive the low-voltage motor 1 to perform the current mode movement, and drives the toothbrush head 2 to perform sweeping and vibrating movement. At the same time, the status indicator module 35 only lights up the indicator LEDs corresponding to the current brushing mode.

[0095] When the human-machine interface module 32 receives a short-press signal from the electric toothbrush button while the toothbrush is in brushing mode or in standby mode, the MCU module 31 sets the next mode as the current brushing mode and controls the motor drive module 34 to drive the low-voltage motor 1 to perform the current mode's movement, causing the toothbrush head 2 to perform a sweeping motion. Simultaneously, the status indicator module 35 only illuminates the LED corresponding to the current brushing mode. If the next mode is standby stop mode, the toothbrush head 2 stops its sweeping motion, the motor enters standby stop mode, and the status indicator module 35 only illuminates the LED corresponding to the power supply.

[0096] When the human-computer interaction module 32 receives a long-press signal from the electric toothbrush button in the electric toothbrush brushing mode or in the standby state, the MCU module 31 issues a power-off command, the motor drive module 34 stops outputting a stop signal, the low-voltage motor 1 stops running, the toothbrush head 2 stops its sweeping motion, and at the same time the status indicator module 35 turns off the indicator LED.

[0097] When the electric toothbrush body 5 remains in standby mode for an extended period, it enters sleep mode, at which point system power consumption is minimized. If the triaxial accelerometer module 35 detects a displacement signal from the electric toothbrush body 5, the control circuit 3 will deactivate the sleep mode, causing the electric toothbrush to enter standby mode.

[0098] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A low-voltage electric toothbrush, comprising a low-voltage motor, an electric toothbrush head, a control circuit, a pair of magnetic encoder sensors, a toothbrush body, a charging interface, and a battery, characterized in that, The electric toothbrush head is detachably connected to the motor shaft of the low-voltage motor, and under the control of the low-voltage motor's drive and control circuit, it performs a circumferential sweeping motion around the motor shaft of the low-voltage motor. The low-voltage motor is electrically connected to the control circuit via a pair of magnetic encoder sensors. A pair of magnetic coded sensors are positioned on the side of the low-voltage motor away from the electric toothbrush head; The battery and low-voltage motor are housed inside the toothbrush body; The control circuit is located inside the toothbrush body; The charging port is located on the side of the toothbrush body away from the brush head and is electrically connected to the control circuit.

2. The low-pressure electric toothbrush according to claim 1, characterized in that, The rated operating voltage of low-voltage motors is +3.7V or +5V; The magnetic coding sensor uses a Hall sensor; The specific model of the magnetic coded sensor is the linear Hall effect sensor MT9103; The charging interface uses a Type-C charging interface with an input voltage of +5V. The battery's output voltage is +3.7V.

3. The low-pressure electric toothbrush according to claim 1, characterized in that, The control circuit includes a microcontroller (MCU) module, a human-machine interface module, a power supply circuit, a motor drive module, a status indication module, a triaxial accelerometer sensor module, and a signal sampling module. The MCU module is electrically connected to the human-machine interaction module, the motor drive module, the status indication module, the triaxial accelerometer module, and the signal sampling module, respectively. The power supply circuit is electrically connected to the MCU module, human-machine interaction module, motor drive module, and status indication module; The signal sampling module is also electrically connected to the motor drive module.

4. The low-pressure electric toothbrush according to claim 3, characterized in that, The input voltage of the MCU module is +3.3V; The power supply circuit has an input voltage of +3.7V and output voltages of +5V and +3.3V.

5. The low-pressure electric toothbrush according to claim 4, characterized in that, The human-computer interaction module includes a first button, a third field-effect transistor, a sixth diode, a fifteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-third resistor, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a tenth capacitor, and an eleventh capacitor; One end of the first button is connected to the DC bus of the motor drive module, and the other end outputs the button status signal to the MCU module through the nineteenth resistor; One end of the tenth capacitor is connected to the button status signal, and the other end is grounded; One end of the 27th resistor is connected to the +5V DC voltage signal output by the charging module, one end of the 25th resistor is connected to the power status signal, and the other ends of the 27th and 25th resistors are connected to the button status signal through the 23rd resistor, grounded through the filter circuit composed of the 26th resistor and the 11th capacitor, and connected to the gate of the 3rd field-effect transistor through the 6th transistor and the 20th resistor.

6. The low-pressure electric toothbrush according to claim 5, characterized in that, The charging module includes a power management chip, a third resistor, a second capacitor, a third capacitor, and a fifth capacitor; The specific model of the battery management chip is TP4056; The battery management chip's fourth and eighth pins receive the +5V DC voltage output from the charging interface, the third and ninth pins are grounded, the second pin is grounded through the third resistor, the seventh pin outputs the battery charging signal and connects to the MCU module, the fourth pin is grounded through the fifth capacitor, and the fifth pin is grounded through the second and third capacitors.

7. The low-pressure electric toothbrush according to claim 6, characterized in that, The power supply circuit includes a boost module and a buck module; The boost module includes a boost chip, a first diode, a first inductor, a fourth resistor, a sixth capacitor, a seventh capacitor, and a ninth capacitor; The input voltage from the battery is connected to the fifth pin of the boost chip through the seventh capacitor and the first inductor. The fifth pin of the boost chip is also connected to the first pin of the boost chip through the first diode, and grounded through the fourth resistor and the ninth capacitor. The fourth pin of the boost chip is grounded, the third pin is left floating, the second pin is connected to the first pin, and a +5V DC voltage is output through the sixth pin; The step-down module includes a step-down chip, a fifth inductor, a twenty-third capacitor, a twenty-fourth capacitor, a twenty-eighth capacitor, and a thirtieth capacitor; The +5V voltage is simultaneously input to the first and third pins of the step-down chip after passing through the fifth inductor and the twenty-eighth capacitor. One end of the twenty-eighth capacitor is connected to the first pin, and the other end is connected to the second pin and grounded. The fourth pin of the step-down chip is grounded through the thirtieth capacitor, and the fifth pin outputs a +3.3V DC voltage after being regulated and filtered by the twenty-third and twenty-fourth capacitors.

8. The low-pressure electric toothbrush according to claim 7, characterized in that, The motor drive module includes a U-phase drive module, a V-phase drive module, and a W-phase drive module; The U-phase drive module includes a first drive chip, a first field-effect transistor, a ninth resistor, an eleventh resistor, a twelfth resistor, and a DC bus; The specific model of the first driver chip is KS3337MA. The third pin of the first driver chip is connected to the positive terminal of the DC bus, and the positive and negative terminals of the DC bus are connected to the positive and negative terminals of the battery, respectively. The fourth pin of the first driver chip is connected to the positive terminal of the DC bus through the eleventh resistor. The fifth, sixth, seventh and eighth pins are connected to the U phase of the low-voltage motor. The second pin is connected to the MCU module through the twelfth resistor. The first pin is connected to the signal sampling module. The specific model of the first field-effect transistor is 2N7002T. Its third pin is connected to the fourth pin of the first driver chip through the ninth resistor, the first pin is connected to the MCU module, and the second pin is grounded. The signal sampling module includes a U-phase signal sampling module, a V-phase signal sampling module, and a W-phase signal sampling module, which are respectively connected to the U-phase, V-phase, and W-phase drive modules of the motor drive module; The U-phase signal sampling module includes a thirteenth resistor, a sixteenth resistor, a fifty-first resistor, and a twenty-fifth capacitor; The RC filter circuit consisting of the thirteenth resistor, the sixteenth resistor, and the twenty-fifth capacitor is connected to the MCU module; The fifty-first resistor is connected to the MCU module.

9. The low-pressure electric toothbrush according to claim 8, characterized in that, The status indicator module includes a first LED, a second LED, a third LED, a fourth LED, a fifth LED, a forty-second resistor, a forty-third resistor, a forty-fourth resistor, and a thirty-fourth resistor; One end of the first LED is connected to resistors 42, 43, and 34, and the other end is connected to the second, third, fourth, and fifth LEDs through resistor 44.

10. The low-pressure electric toothbrush according to claim 9, characterized in that, The triaxial accelerometer module includes a first triaxial accelerometer chip, a first resistor, a second resistor, a thirty-sixth resistor, a fortieth resistor, a thirty-eighth capacitor, a forty-third capacitor, and a forty-fourth capacitor; The specific model of the first triaxial accelerometer chip is SC7A20TR. Its second and twelfth pins are connected to the MCU module and are connected to a +3.3V DC voltage through the fortieth and thirty-sixth resistors, respectively. The third and tenth pins are connected to a +3.3V DC voltage through the thirty-eighth capacitor and the first resistor, respectively. The seventh, eighth and ninth pins form a voltage regulator and filter circuit, and the fourth pin is grounded through the second resistor.

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