Control circuit and electric toothbrush

Abstract

The utility model provides a control circuit and an electric toothbrush, which are applied to the electric toothbrush, and the control circuit comprises a power supply circuit, a pressure sensing circuit, a motor driving circuit, a main control circuit and a pressure sensing lamp circuit. The pressure sensing circuit is arranged to monitor the pressure applied during tooth brushing in real time, when it is detected that the pressure exceeds the safety threshold value, the main control circuit triggers the motor to enter the preset overpressure mode on one hand and triggers the pressure sensing lamp circuit to give out the warning light effect on the other hand, in the process, a user is prompted to adjust the force through tactile feedback and optical warning, and the user experience is improved. Gingival injury and tooth hard tissue abrasion caused by excessive pressure application are avoided. Meanwhile, a motor driving circuit is adopted to drive a motor to form sound wave vibration, so that water flow and toothpaste foam form micro jet flow which permeates into blind areas such as tooth slits and gingival sulcus which are difficult to cover by a traditional vibration type scheme, the dental plaque removal rate is increased, and the risk of caries and periodontal diseases is reduced.

Description

Technical Field

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

[0002] With the widespread adoption of personal care electronic devices, electric toothbrushes, as frequently used oral care tools, have seen their functional integration and user experience optimization become key areas for product upgrades. Currently, traditional electric toothbrushes lack pressure sensing structures, making it impossible for users to intuitively perceive brushing force. When applying pressure by feel, it is easy to use too much force, which may lead to bleeding gums, gum recession, and even enamel wear with long-term use. This violates the gentle principle of the "Bass brushing technique." When excessive pressure is applied, the bristles are pressed tightly against the tooth surface, which actually reduces the range of motion of the bristles and weakens the cleaning effect.

[0003] Furthermore, the mainstream technology in the current electric toothbrush industry is still dominated by mechanical rotation or basic vibration cleaning solutions, which rely on the physical friction between the bristles and the tooth surface to achieve cleaning. Traditional mechanical toothbrushes rely on direct contact friction between the bristles, and the cleaning range is limited to the physical contact area of ​​the brush head. The vibration frequency is singular, and it cannot drive water flow and foam to penetrate into the gaps between teeth and the gingival sulcus through high-frequency vibration, resulting in poor cleaning effect on hidden areas. Utility Model Content

[0004] The main purpose of this invention is to propose a control circuit and an electric toothbrush, which aims to solve the problem of gum damage caused by the lack of pressure feedback mechanism in traditional electric toothbrushes, which prevents users from sensing excessive force, as well as the low cleaning efficiency of basic vibration cleaning solutions.

[0005] To address the aforementioned problems, this application proposes a control circuit for use in an electric toothbrush, the electric toothbrush comprising a motor and a battery, the control circuit comprising:

[0006] The power supply circuit is used to process and output the power from the battery.

[0007] The pressure sensing circuit is used to acquire pressure signals and convert them into a first electrical signal output.

[0008] A motor drive circuit, with its output terminal connected to the controlled terminal of the motor, is used to drive the motor to work and provide acoustic vibration.

[0009] The main control circuit is connected to the output terminal of the pressure sensing circuit and the input terminal of the motor drive circuit. It is used to receive and output a corresponding first control signal to the motor drive circuit according to the first electrical signal output by the pressure sensing circuit, so as to control the motor to enter the preset overpressure mode.

[0010] The pressure-sensing lamp circuit has its input terminal connected to the main control circuit. The main control circuit is also used to output a corresponding first driving signal to the pressure-sensing lamp circuit according to the first electrical signal, so that the pressure-sensing lamp circuit responds to the first driving signal and operates.

[0011] In one embodiment, the electric toothbrush further includes a toothbrush head, and the pressure sensing circuit includes:

[0012] A pressure sensor switch is installed inside the toothbrush head. One end of the pressure sensor switch is connected to the pressure input terminal of the main control circuit, and the other end is grounded. The pressure sensor switch is used to detect the pressure of the toothbrush head in contact with the teeth and outputs a first electrical signal to the main control circuit when triggered.

[0013] In one embodiment, it further includes:

[0014] A power switch circuit, connected to the main control circuit, is used to output a corresponding second electrical signal to the main control circuit when operated by the user.

[0015] The main control circuit is used to receive and output a corresponding second control signal to the motor drive circuit according to the second electrical signal of the power switch circuit, so as to control the motor to enter the corresponding working mode.

[0016] In one embodiment, the power switch circuit includes:

[0017] A power button switch, one end of which is connected to the switch input terminal of the main control circuit, and the other end is grounded; the power button switch is used to output a corresponding second electrical signal to the main control circuit when operated by the user.

[0018] In one embodiment, it further includes:

[0019] An indicator light circuit, connected to the main control circuit, is used to display the working status of the electric toothbrush;

[0020] The main control circuit is also used to receive and output a corresponding second drive signal to the indicator light circuit according to the second electrical signal of the power switch circuit, so as to control the operation of the indicator light circuit.

[0021] In one embodiment, the motor has multiple operating modes, and the indicator circuit includes multiple LEDs, with each operating mode corresponding to one LED in the indicator circuit.

[0022] The main control circuit is also used to output a corresponding second control signal to the motor drive circuit each time it receives a second electrical signal from the power switch circuit, so as to control the motor to enter the next working mode in a preset order and to output a corresponding second drive signal to the LED light corresponding to the current working mode of the motor.

[0023] In one embodiment, the power supply circuit includes:

[0024] A battery-powered circuit, with its input terminal connected to the battery;

[0025] The power management circuit has its input terminal connected to the input terminal of the battery power supply circuit, and is used to convert the battery power into a first voltage and output it.

[0026] In one embodiment, it further includes:

[0027] The charging end is connected to the power supply circuit.

[0028] An overvoltage protection circuit, with its input terminal connected to the charging terminal and its output terminal connected to the power management circuit, is used to disconnect the connection between the charging terminal and the power circuit when the charging voltage of the electric toothbrush is too high.

[0029] In addition, this application also proposes an electric toothbrush, including a battery, a motor, and a control circuit as described above.

[0030] In one embodiment of an electric toothbrush, it further includes:

[0031] The control circuit is located inside the handle.

[0032] A toothbrush head, which is detachably mounted at one end of the handle.

[0033] This application uses a pressure-sensing circuit to monitor the pressure applied during brushing in real time. When the pressure exceeds a safe threshold, the main control circuit triggers the motor to enter a preset overpressure mode and simultaneously activates a pressure-sensing light circuit to emit a warning light effect. This process provides tactile feedback and optical warnings to prompt the user to adjust the pressure, preventing excessive pressure that could damage the gums and abrade the tooth structure. Simultaneously, this application uses a motor drive circuit to drive the motor and generate sonic vibrations, causing the water flow and toothpaste foam to form micro-jet streams that penetrate into areas difficult to reach with traditional vibration-based methods, such as between teeth and the gingival sulcus. This improves plaque removal efficiency and reduces the risk of cavities and periodontal disease. Attached Figure Description

[0034] 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.

[0035] Figure 1 This is a structural diagram of a control circuit according to the present invention.

[0036] Figure 2 This is a circuit diagram of a control circuit according to the present invention.

[0037] Reference numerals: Power supply circuit 01, Battery power supply circuit 11, Power management circuit 12, Overvoltage protection circuit 13, Pressure sensing circuit 02, Motor drive circuit 03, Main control circuit 04, Pressure sensing lamp circuit 05, Power switch circuit 06.

[0038] 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

[0039] 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.

[0040] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0041] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0042] This application discloses a control circuit for use in an electric toothbrush, the electric toothbrush including a motor and a battery, such as... Figure 1 As shown, the control circuit includes:

[0043] Power supply circuit 01 is used to process and output the battery power.

[0044] Pressure sensing circuit 02 is used to acquire pressure signals and convert them into a first electrical signal output.

[0045] Motor drive circuit 03, with its output terminal connected to the controlled terminal of the motor, is used to drive the motor to work and provide acoustic vibration;

[0046] The main control circuit 04 is connected to the output terminal of the pressure sensing circuit 02 and the input terminal of the motor drive circuit 03. It is used to receive and output a corresponding first control signal to the motor drive circuit 03 according to the first electrical signal output by the pressure sensing circuit 02, so as to control the motor to enter the preset overpressure mode.

[0047] The pressure-sensing lamp circuit 05 has its input terminal connected to the main control circuit 04. The main control circuit 04 is also used to output a corresponding first driving signal to the pressure-sensing lamp circuit 05 according to the first electrical signal, so that the pressure-sensing lamp circuit 05 responds to the first driving signal and works.

[0048] Specifically, the technological iteration of the electric toothbrush industry has long been constrained by traditional motor manufacturing thinking. Early rotary motors, with their simple structure and controllable cost, became the mainstream solution for market adoption. However, this technological inertia led manufacturers to over-focus on "how to improve physical friction efficiency," neglecting the possibility of "non-contact cleaning." While sonic vibration technology has emerged, its R&D investment and market education costs are high, leading some companies to prefer marginal improvements within existing frameworks (such as increasing bristle density and optimizing brush head shape) rather than disruptive innovation. Consumers' intuitive understanding of "cleaning power" is often simplified to "bristle hardness" or "vibration intensity." This cognitive bias is exploited by some manufacturers who promote concepts like "super-strong vibration" and "deep stain removal" to reinforce the pursuit of aggressive cleaning.

[0049] In reality, excessively pursuing high physical friction intensity not only damages oral soft tissues but can also lead to a precipitous drop in cleaning efficiency due to rapid bristle wear. The lack of market education has resulted in users' insufficient perception of the value of advanced features such as "scientific gum care" and "fluid cleaning," indirectly slowing down technological upgrades. Upgrading electric toothbrushes involves the integration of technologies from multiple fields, including precision motors, sensors, and algorithms. For example, the sensitivity of miniature pressure sensors needs to be balanced with waterproofing requirements, power consumption control of high-frequency motors relies on breakthroughs in battery technology, and dynamic adjustment algorithms require support from clinical oral medicine data. Currently, the industry has not yet formed a cross-disciplinary collaborative innovation ecosystem; individual manufacturers are often limited by their own technological accumulation, making it difficult to systematically overcome technological bottlenecks.

[0050] As user demands evolve, the technological challenges facing electric toothbrushes are becoming increasingly apparent. Traditional electric toothbrushes are designed with a "one-way cleaning action" logic, lacking the ability to perceive and respond to user actions. For example, most products do not integrate pressure sensing modules, preventing users from intuitively sensing brushing force. When the brush head excessively presses against the tooth surface, the bristles bend and deform, drastically reducing the effective oscillation range and thus lowering cleaning efficiency. More seriously, prolonged excessive pressure can accelerate gum recession, inducing dentin hypersensitivity and even wedge-shaped defects. Mechanical brush heads have a fixed movement trajectory, only acting on the tooth surface area directly in contact with the bristles. For non-planar structures such as interdental spaces and gingival sulci, especially the concave areas of the occlusal surface of posterior teeth, the bristles cannot fully conform, resulting in persistent cleaning blind spots. Traditional vibration modes generally have low frequencies (typically in the thousands of times per minute) and cannot generate a hydrodynamic effect through high-frequency vibration. Toothpaste foam and water flow can only passively adhere to the bristle surface, lacking penetrating flow and failing to penetrate hidden areas to break down plaque.

[0051] Therefore, this application proposes a control circuit for an electric toothbrush, including a power supply circuit 01, a pressure sensing circuit 02, a motor drive circuit 03, a main control circuit 04, and a pressure sensing lamp circuit 05. The power supply circuit 01 processes the battery power before outputting it. These processing steps are crucial for ensuring a stable power supply to subsequent circuits. A stable power supply is the cornerstone of the normal operation of an electric toothbrush. Especially in precision control applications such as sonic vibration, even small voltage fluctuations can affect the motor's vibration frequency and amplitude, thus impacting the cleaning effect. Therefore, the design and optimization of the power supply circuit 01 are essential for improving the performance and reliability of the electric toothbrush.

[0052] The pressure sensing circuit 02 is used to collect pressure signals and convert them into a first electrical signal output. The pressure sensing circuit 02 uses a built-in sensor (such as a piezoresistive sensor or a capacitive sensor) to collect the pressure signals applied by the user during brushing. These signals are converted into electrical signals and output to the main control circuit 04 for processing. The introduction of the pressure sensing circuit 02 directly addresses the problem that users cannot intuitively perceive the brushing force. Traditional electric toothbrushes lack pressure sensing capabilities, making it impossible to intervene in time or quantify the risk of damage when the user applies excessive force. Through the pressure sensing circuit 02, the electric toothbrush can continuously sense the environment and interact with the user, dynamically adjusting its working state to achieve a precise balance between cleaning efficiency and tissue protection. The main control circuit 04 is connected to the output terminal of the pressure sensing circuit 02 and the input terminal of the motor drive circuit 03. When the pressure exceeds the safety threshold, the main control circuit 04 outputs a corresponding first control signal to the motor drive circuit 03, triggering the motor to enter a preset overpressure mode. Simultaneously, it outputs a corresponding first drive signal to the pressure sensing light circuit 05, triggering the pressure sensing light circuit 05 to emit a warning light effect.

[0053] The motor drive circuit 03, with its output connected to the controlled end of the motor, drives the motor to provide acoustic vibration. The motor drive circuit 03 is the core of the acoustic vibration technology, its technological value lying in overcoming the rigid limitations of traditional motor control modes. Early rotary motors relied on simple open-loop control, providing only fixed-frequency mechanical motion, while acoustic vibration requires the motor to achieve precise amplitude and frequency modulation at high frequencies of tens of thousands of times per minute. This high-frequency vibration enables water flow and toothpaste foam to form microjets, penetrating into blind spots such as interdental spaces and gingival sulci that are difficult to cover with traditional vibration methods, more effectively breaking down plaque and tartar while reducing physical wear on teeth and gums. The motor drive circuit 03 can precisely control the vibration intensity, direction, and frequency of the motor by changing the duty cycle (i.e., the proportion of high-level signals) and phase difference (i.e., the time difference between two or more signals) of the drive signal. When the main control circuit 04 sends the first control signal, the drive circuit can automatically adjust the output waveform parameters to control the motor to enter a preset overvoltage mode. Preferably, the preset overpressure mode is a motor-controlled rapid pulse vibration of the toothbrush head, which allows users to intuitively feel the changes in the vibration of the toothbrush head, thereby prompting users to adjust the pressure through tactile feedback.

[0054] The pressure-sensing lamp circuit 05 has its input terminal connected to the main control circuit 04. The main control circuit 04 is also used to output a corresponding first drive signal to the pressure-sensing lamp circuit 05 according to the first electrical signal, so that the pressure-sensing lamp circuit 05 responds to the first drive signal and operates. When users apply excessive pressure in pursuit of a "strong cleaning feeling," traditional products lack intuitive warning methods, leading to the solidification of incorrect usage habits. This circuit includes an LED array, which is controlled to light up by the first drive signal output by the main control circuit 04. In this application, the LEDs in the pressure-sensing lamp circuit 05 are placed in different locations from other indicator lights to avoid confusion. At the same time, the pressure-sensing lamp circuit 05 uses red LEDs to form a strong warning signal. This multimodal feedback mechanism not only intervenes in incorrect operation in real time, but also helps users establish muscle memory for scientific force application through long-term behavioral training, helping users establish scientific brushing habits.

[0055] This application uses a pressure sensing circuit 02 to monitor the pressure applied during brushing in real time. When the pressure exceeds a safe threshold, the main control circuit 04 triggers the motor to enter a preset overpressure mode and simultaneously triggers the pressure sensing light circuit 05 to emit a warning light effect. This process provides tactile feedback and optical warnings to prompt the user to adjust the pressure, avoiding excessive pressure that could damage the gums and abrade the tooth structure. Simultaneously, this application uses a motor drive circuit 03 to drive the motor to generate sonic vibrations, causing the water flow and toothpaste foam to form micro-jet streams that penetrate into areas difficult to reach with traditional vibration-based methods, such as between teeth and the gingival sulcus, thereby improving plaque removal rates and reducing the risk of cavities and periodontal disease.

[0056] In one embodiment, such as Figure 2 As shown, the electric toothbrush also includes a toothbrush head, and the pressure sensing circuit 02 includes:

[0057] A pressure sensor switch is used to detect the pressure of the toothbrush head contacting the teeth and outputs a first electrical signal to the main control circuit 04 when triggered. This device is typically integrated into the toothbrush head in an embedded structure, positioned close to the bristle roots. Its spatial arrangement is designed to ensure the sensor can directly sense the mechanical changes generated when the bristles contact the teeth. Its function is to detect pressure changes when the toothbrush head contacts the teeth. One end of the pressure sensor switch is connected to the pressure input terminal of the main control circuit 04, and the other end is grounded, thus constructing a complete signal transmission loop. When the contact pressure applied by the user during brushing reaches a preset threshold, the internal mechanical structure or sensitive element of the sensor will undergo physical deformation, triggering a change in the switch state, thereby generating an electrical signal with specific characteristics. This signal is transmitted to the core processor of the main control circuit 04, forming a key input parameter for closed-loop feedback control, thus realizing real-time dynamic monitoring of brushing pressure. More specifically, in this embodiment, the pressure sensing light circuit 05 is installed on the handle of the electric toothbrush, and the preset pressure threshold is 375±75g. When the toothbrush head is pressed by 375±75g, the first electrical signal is output to the main control circuit 04, the pressure sensing light circuit 05 on the handle lights up red, and the toothbrush head vibrates rapidly with pulses. Through tactile feedback and optical warning, the user is prompted to adjust the pressure to avoid excessive pressure that could cause gum damage and wear of the hard tissues of the teeth.

[0058] In one embodiment, it further includes:

[0059] A power switch circuit 06, connected to the main control circuit 04, outputs a corresponding second electrical signal to the main control circuit 04 when operated by the user. The main control circuit 04 receives the second electrical signal from the power switch circuit 06 and outputs a corresponding second control signal to the motor drive circuit 03 to control the motor to enter the corresponding operating mode. The power switch circuit 06 is designed for user convenience; the user only needs to operate the power switch to trigger the circuit to output the corresponding second electrical signal to the main control circuit 04. After receiving the second electrical signal from the power switch circuit 06, the main control circuit 04 quickly outputs the corresponding second control signal to the motor drive circuit 03 according to preset logic rules. Upon receiving the second control signal from the main control circuit 04, the motor drive circuit 03 immediately adjusts the motor's operating state to enter the corresponding operating mode. For example, when the user starts the electric toothbrush via the power switch, the motor quickly starts and enters the normal cleaning mode; a second operation will switch the motor to whitening mode, massage mode, etc. The power switch circuit 06 makes the power on / off and operating mode switching of the electric toothbrush intuitive and easy to operate, improving the user experience. Whether it's starting, turning off, or adjusting the brushing mode, users can easily achieve these tasks with simple operations, thus enjoying a more comfortable and efficient brushing experience.

[0060] In one embodiment, such as Figure 2 As shown, the power switch circuit 06 includes:

[0061] A power button switch is provided, with one end connected to the switch input terminal of the main control circuit 04 and the other end grounded, forming a complete circuit loop. The power button switch outputs a corresponding second electrical signal to the main control circuit 04 when operated by the user. When the user lightly touches the power button switch, a specific second electrical signal is generated and transmitted to the main control circuit 04. The main control circuit 04, acting as the "brain" of the entire electric toothbrush system, is responsible for receiving and interpreting this signal from the power switch circuit 06. Upon receiving the second electrical signal, the main control circuit 04 responds quickly according to its built-in program logic. It generates a corresponding control command, which is then sent to the motor drive circuit 03 to achieve precise control of the motor's operating state.

[0062] In one embodiment, such as Figure 2 As shown, it also includes:

[0063] An indicator light circuit, connected to the main control circuit 04, is used to display the working status of the electric toothbrush. The main control circuit 04 is also used to receive and output a corresponding second drive signal to the indicator light circuit according to the second electrical signal from the power switch circuit 06, controlling the indicator light circuit to work. The motor's working mode includes multiple working modes, and the indicator light circuit includes multiple LEDs, with each working mode corresponding to one LED in the indicator light circuit. The main control circuit 04 is also used to output a corresponding second control signal to the motor drive circuit 03 each time it receives the second electrical signal from the power switch circuit 06, to control the motor to enter the next working mode in a preset order, and to output a corresponding second drive signal to the LED corresponding to the current working mode of the motor. More specifically, the main control chip has an embedded configurable state machine, and each valid operation triggers a cyclic switching of modes.

[0064] Specifically, the motor features multiple operating modes, each corresponding to a different vibration frequency and intensity, designed to provide users with a more refined and enriching cleaning experience. To intuitively display the current motor operating mode, an indicator light circuit is integrated into the electric toothbrush. This circuit consists of multiple LEDs, each corresponding to a specific operating mode of the motor. When the user selects a particular mode, the corresponding LED illuminates, clearly informing the user of the motor's current operating status. More specifically, the motor's operating modes, in a preset sequence, include: ① Level 1: 260Hz±19Hz (Whitening), duty cycle: 70%; ② Level 2: 310Hz±19Hz (Cleansing), duty cycle: 50%; ③ Level 3: 250Hz±19Hz (Sensitive), duty cycle: 40%; ④ Level 4: Quick switch between Level 1 and Level 3; ⑤ Level 5: 230Hz±19Hz (Massage), duty cycle: 50%. The indicator light circuit enhances the interactivity of the electric toothbrush, allowing users to clearly understand the current working mode at a glance. It also enhances the user experience through visual feedback. Whether a first-time user or an experienced user, the intuitive display of the indicator light circuit allows them to easily grasp the working status of the electric toothbrush.

[0065] In one embodiment, the power supply circuit 01 includes:

[0066] A battery power supply circuit 11 has its input terminal connected to the battery. A power management circuit 12 has its input terminal connected to the input terminal of the battery power supply circuit 11, and is used to convert the battery power into a first voltage and output it. The input terminal of the battery power supply circuit 11 is directly connected to the battery, providing a continuous power source for the operation of the electric toothbrush. The battery power supply circuit 11 not only receives electrical energy from the battery, but also processes the electrical energy in a form most suitable for the operation of the electric toothbrush through its internal circuit structure. The power management circuit 12 is located after the battery power supply circuit 11, and its input terminal is closely connected to the input terminal of the battery power supply circuit 11. The power management circuit 12 is responsible for further processing and conversion of the electrical energy input from the battery power supply circuit 11. In this process, the power management circuit 12 converts the original voltage provided by the battery into a first voltage suitable for the operation of various components of the electric toothbrush, and outputs this voltage stably. The power management circuit 12 ensures that the electric toothbrush can obtain a stable and continuous power supply, and also achieves efficient utilization of electrical energy through the precise control of the power management circuit 12. Whether it's the battery's power input or the converted voltage output, the power management circuit 12 ensures that the electric toothbrush can operate stably in various usage scenarios.

[0067] In one embodiment, it further includes:

[0068] The charging terminal is connected to the power supply circuit 01. An overvoltage protection circuit 13, with its input connected to the charging terminal and its output connected to the power management circuit 12, disconnects the charging terminal from the power supply circuit 01 when the charging voltage of the electric toothbrush is too high. The charging terminal, as the connection point between the electric toothbrush and an external power source, is designed to balance convenience and safety. Users can easily charge the electric toothbrush simply by inserting the charging cable into the charging terminal, without complicated procedures. Simultaneously, the tight connection between the charging terminal and the power supply circuit 01 ensures that electrical energy can be efficiently and stably transmitted to the electric toothbrush, providing sufficient power support for the motor and other components. However, if the charging voltage is too high during charging, it may damage the power supply circuit 01 of the electric toothbrush, or even cause safety hazards. To effectively avoid this problem, an overvoltage protection circuit 13 is specifically introduced. The input of this circuit is connected to the charging terminal, and its output is connected to the power management circuit 12. When the charging voltage exceeds the preset safety threshold, the overvoltage protection circuit 13 will respond quickly and automatically disconnect the connection between the charging terminal and the power supply circuit 01, thereby effectively preventing overvoltage from damaging the electric toothbrush.

[0069] Furthermore, this application also proposes an electric toothbrush, including a battery, a motor, and the control circuit described above. The control circuit includes a power supply circuit 01, a pressure sensing circuit 02, a motor drive circuit 03, a main control circuit 04, and a pressure sensing light circuit 05. This application uses the pressure sensing circuit 02 to monitor the pressure applied during brushing in real time. When the pressure exceeds a safe threshold, the main control circuit 04 triggers the motor to enter a preset overpressure mode and simultaneously triggers the pressure sensing light circuit 05 to emit a warning light effect. This process provides tactile feedback and optical warnings to prompt the user to adjust the pressure, avoiding excessive pressure that could damage the gums and abrade the hard tissues of the teeth. Simultaneously, this application uses the motor drive circuit 03 to drive the motor to generate sonic vibrations, causing the water flow and toothpaste foam to form micro-jet streams that penetrate into areas difficult to reach with traditional vibration methods, such as between teeth and the gingival sulcus, thereby improving plaque removal rates and reducing the risk of caries and periodontal disease.

[0070] In one embodiment of an electric toothbrush, it further includes:

[0071] The control circuit, battery, and motor are housed within the handle; the toothbrush head is detachably mounted at one end of the handle. By integrating the control circuit, battery, and motor into the handle, and employing a detachable toothbrush head design, electric toothbrushes become easier to maintain and upgrade. Traditional electric toothbrushes, due to their highly integrated design, often require complete disposal when the bristles wear down or the battery ages. The modular design allows for independent replacement of worn parts—the brush head only needs to be rotated to remove it when its lifespan ends, and the battery compartment uses a sliding rail design for user-friendly replacement, significantly reducing operating costs and e-waste generation. The handle, as a long-term platform, can continuously improve performance through firmware upgrades; the brush head, as a functional carrier, can be updated with advancements in materials technology (such as graphene bristles and piezoelectric actuation technology), allowing users to enjoy technological benefits without replacing the handle. This "platform + plug-in" ecosystem transforms the product from a "disposable consumer good" into a "sustainable health platform."

[0072] The above embodiments are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A control circuit for use in an electric toothbrush, the electric toothbrush comprising a motor and a battery, characterized in that, The control circuit includes: The power supply circuit is used to process and output the power from the battery. The pressure sensing circuit is used to acquire pressure signals and convert them into a first electrical signal output. A motor drive circuit, with its output terminal connected to the controlled terminal of the motor, is used to drive the motor to work and provide acoustic vibration. The main control circuit is connected to the output terminal of the pressure sensing circuit and the input terminal of the motor drive circuit. It is used to receive and output a corresponding first control signal to the motor drive circuit according to the first electrical signal output by the pressure sensing circuit, so as to control the motor to enter the preset overpressure mode. The pressure-sensing lamp circuit has its input terminal connected to the main control circuit. The main control circuit is also used to output a corresponding first driving signal to the pressure-sensing lamp circuit according to the first electrical signal, so that the pressure-sensing lamp circuit responds to the first driving signal and operates.

2. The control circuit as described in claim 1, wherein the electric toothbrush further includes a toothbrush head, characterized in that, The pressure sensing circuit includes: A pressure sensor switch is installed inside the toothbrush head. One end of the pressure sensor switch is connected to the pressure input terminal of the main control circuit, and the other end is grounded. The pressure sensor switch is used to detect the pressure of the toothbrush head in contact with the teeth and outputs a first electrical signal to the main control circuit when triggered.

3. The control circuit as described in claim 1, characterized in that, Also includes: A power switch circuit, connected to the main control circuit, is used to output a corresponding second electrical signal to the main control circuit when operated by the user. The main control circuit is used to receive and output a corresponding second control signal to the motor drive circuit according to the second electrical signal of the power switch circuit, so as to control the motor to enter the corresponding working mode.

4. The control circuit as described in claim 3, characterized in that, The power switch circuit includes: A power button switch, one end of which is connected to the switch input terminal of the main control circuit, and the other end is grounded; the power button switch is used to output a corresponding second electrical signal to the main control circuit when operated by the user.

5. The control circuit as described in claim 3, characterized in that, Also includes: An indicator light circuit, connected to the main control circuit, is used to display the working status of the electric toothbrush; The main control circuit is also used to receive and output a corresponding second drive signal to the indicator light circuit according to the second electrical signal of the power switch circuit, so as to control the operation of the indicator light circuit.

6. The control circuit as described in claim 5, characterized in that, The motor has multiple operating modes, and the indicator circuit includes multiple LEDs, with each operating mode corresponding to one LED in the indicator circuit. The main control circuit is also used to output a corresponding second control signal to the motor drive circuit each time it receives a second electrical signal from the power switch circuit, so as to control the motor to enter the next working mode in a preset order and to output a corresponding second drive signal to the LED light corresponding to the current working mode of the motor.

7. The control circuit as described in claim 1, characterized in that, The power supply circuit includes: A battery-powered circuit, with its input terminal connected to the battery; The power management circuit has its input terminal connected to the input terminal of the battery power supply circuit, and is used to convert the battery power into a first voltage and output it.

8. The control circuit as described in claim 7, characterized in that, Also includes: The charging end is connected to the power supply circuit. An overvoltage protection circuit, with its input terminal connected to the charging terminal and its output terminal connected to the power management circuit, is used to disconnect the connection between the charging terminal and the power circuit when the charging voltage of the electric toothbrush is too high.

9. An electric toothbrush, characterized in that, Includes a battery, a motor, and a control circuit as described in any one of claims 1-8.

10. The electric toothbrush as described in claim 9, characterized in that, Also includes: The control circuit, battery, and motor are housed within the handle. A toothbrush head, which is detachably mounted at one end of the handle.

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