Charging circuit, base and toothbrush assembly

Abstract

The utility model provides a charging circuit, a base and a toothbrush assembly, and the charging circuit is applied to a charging base, and comprises a power supply processing circuit which is used for carrying out power supply processing on accessed electric energy and then outputting the processed electric energy; the wireless charging circuit comprises an inductor, and the wireless charging circuit is used for wirelessly outputting the electric energy output by the power supply processing circuit; and the charging control circuit is used for driving the wireless charging circuit to wirelessly output the electric energy output by the power supply processing circuit. According to the charging circuit, the inductor replaces a traditional coil to serve as a core element of the wireless charging circuit, the modular arrangement of the power supply processing circuit and the charging control circuit is combined, the circuit structure is simplified, the hardware cost is reduced, meanwhile, the flat characteristic of the inductor is utilized to achieve compact layout, and the requirement for a small-sized charging base is met; the charging control circuit dynamically drives and modulates the electric energy, so that the energy transmission efficiency and the system stability are improved.

Description

Technical Field

[0001] This application relates to the technical field of oral hygiene, and more particularly to a charging circuit, a base, and a toothbrush assembly. Background Technology

[0002] With the increasing adoption of wireless charging technology in personal care devices (such as electric toothbrushes), higher demands are being placed on cost control and assembly efficiency of charging devices. Traditional inductive charging devices typically employ a split structure, using a coil frame as the winding carrier. After the coil is wound, a ferrite core needs to be fixed to the bottom of the coil frame to enhance magnetic coupling efficiency.

[0003] While ferrite cores are crucial for maintaining charging efficiency, their separate procurement and assembly significantly increase material and labor costs, and balancing precision and efficiency is difficult. Because the ferrite core and coil frame are separate structures, precise alignment of the core and coil relies on high-precision molds and assembly equipment, leading to longer production cycles and reduced mass production efficiency. Furthermore, the core is typically glued to the coil frame, which is prone to detachment in vibrating environments; increasing bonding strength requires high-cost specialty adhesives, further exacerbating cost pressures.

[0004] Furthermore, traditional wire-wound coils often employ multi-layered stacked structures to meet magnetic field strength requirements, making it difficult to compress their thickness and volume. In miniature devices such as electric toothbrushes, bulky coil modules encroach on the design space of battery compartments or waterproof sealing structures, forcing engineers to compromise between charging efficiency and product form factor. In addition, discrete coils need to be soldered to the PCB board via leads, and the parasitic inductance of the leads can interfere with signal integrity under high-frequency operating conditions, increasing the difficulty of electromagnetic compatibility (EMC) design. Utility Model Content

[0005] The main purpose of this application is to provide a charging circuit, a base, and a toothbrush assembly, which aims to solve the technical problems of large size and high cost caused by the use of traditional coils in traditional toothbrush charging bases.

[0006] To achieve the above objectives, this application proposes a charging circuit for use in a charging dock, comprising:

[0007] Power processing circuit, used to process the incoming electrical energy and then output it;

[0008] A wireless charging circuit is connected to the output terminal of the power processing circuit. The wireless charging circuit includes an inductor and is used to wirelessly output the electrical energy output by the power processing circuit.

[0009] A charging control circuit, connected to the controlled terminal of the wireless charging circuit, is used to drive the wireless charging circuit to wirelessly output the electrical energy output by the power processing circuit.

[0010] In one embodiment, the wireless charging circuit further includes:

[0011] A switching transistor, the input terminal of which is connected to one end of the inductor, the controlled terminal of which is connected to the charging control circuit, and the output terminal of which is grounded; the other end of the inductor is connected to the output terminal of the power processing circuit.

[0012] A capacitor is connected in parallel with the inductor to form a resonant circuit.

[0013] In one embodiment, the inductor is an I-shaped inductor, which includes a magnetic core and a coil wound around the magnetic core.

[0014] In one embodiment, the charging control circuit includes:

[0015] The main control chip is connected to the controlled terminal of the switching transistor. The main control chip is used to control the switching transistor to turn on / off, so as to drive the resonant circuit to work.

[0016] In one embodiment, the output terminal of the switching transistor is grounded through a sampling resistor, and the charging control circuit further includes:

[0017] The charging detection circuit has its input terminal connected to one end of the sampling resistor via a first resistor, the other end of the sampling resistor being grounded, and its output terminal being electrically connected to the main control chip.

[0018] The charging detection circuit is used to acquire and amplify the voltage sampling signal of the sampling resistor and transmit the amplified voltage sampling signal to the main control chip; the main control chip is also used to receive and determine the charging status of the external device based on the sampling signal of the charging detection circuit, and output corresponding control signals to the switching transistor.

[0019] In one embodiment, the charging detection circuit includes a non-inverting amplifier, the non-inverting input terminal of which is connected to one end of a sampling resistor via a first resistor, and the other end of the sampling resistor is grounded.

[0020] The inverting input terminal of the non-inverting amplifier is grounded through a second resistor, and the output terminals of the non-inverting amplifier are connected to the inverting input terminal through a feedback resistor.

[0021] In one embodiment, the power processing circuit includes:

[0022] A rectifier circuit, the input terminal of which is connected to an external power supply, is used to convert the external power supply into DC voltage;

[0023] The DC-DC conversion circuit has its input terminal connected to the output terminal of the rectifier circuit, and its output terminal connected to the power input terminal of the wireless charging circuit and the charging control circuit. The DC-DC conversion circuit is used to convert the DC voltage output by the rectifier circuit into a low-voltage DC voltage to power the wireless charging circuit and the charging control circuit.

[0024] In addition, this application also proposes a charging dock, which includes a housing and a charging circuit as described above;

[0025] The charging circuit is housed inside the casing.

[0026] In addition, this application also proposes a toothbrush assembly, including an electric toothbrush and a charging base as described above.

[0027] In one embodiment of a toothbrush assembly, it further includes:

[0028] The receiver is located inside the electric toothbrush and is used to receive the charging signal generated by the wireless charging circuit and convert it into electrical energy.

[0029] This application includes a power processing circuit, a wireless charging circuit, and a charging control circuit. The wireless charging circuit includes an inductor. The charging circuit of this application uses an inductor instead of a traditional coil as the core component of the wireless charging circuit. Combined with the modular design of the power processing circuit and the charging control circuit, the circuit architecture is simplified and the hardware cost is reduced. At the same time, the flatness of the inductor is used to achieve a compact layout, which is suitable for the miniaturized charging dock requirements. The charging control circuit dynamically drives and modulates the electrical energy, thereby improving the energy transmission efficiency and system stability. Attached Figure Description

[0030] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0031] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of a charging circuit according to this application;

[0033] Figure 2 This is a framework diagram of an embodiment of a charging circuit according to this application;

[0034] Figure 3This is a topology diagram of a charging circuit according to this application.

[0035] Reference numerals: Power processing circuit 01, rectifier circuit 11, DC-DC conversion circuit 12, wireless charging circuit 02, inductor 21, switching transistor 22, charging control circuit 03, main control chip 31, charging detection circuit 32.

[0036] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0037] 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.

[0038] 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.

[0039] 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.

[0040] This application proposes a charging circuit, such as Figure 1 and Figure 3 As shown, it is applied to the charging dock and includes:

[0041] Power processing circuit 01 is used to process the incoming electrical energy and then output it.

[0042] The wireless charging circuit 02 is connected to the output terminal of the power processing circuit 01. The wireless charging circuit 02 includes an inductor 21 and is used to wirelessly output the electrical energy output by the power processing circuit 01.

[0043] The charging control circuit 03 is connected to the controlled end of the wireless charging circuit 02 and is used to drive the wireless charging circuit 02 to wirelessly output the electrical energy output by the power processing circuit 01.

[0044] Specifically, in personal care devices such as electric toothbrushes, wireless charging systems typically consist of a charging base (transmitter) and a toothbrush handle (receiver). The charging base has a built-in transmitting coil that generates an alternating magnetic field when connected to a power source; the toothbrush handle has an embedded receiving coil that converts magnetic energy into electrical energy through magnetic field coupling, which is then rectified and regulated to charge the built-in battery. This technology eliminates the traditional plug-and-play charging interface, not only improving the device's waterproof performance (such as IPX8-level sealing design) but also avoiding contact problems caused by oxidation of metal contacts, significantly extending the product's lifespan.

[0045] The coil is the "energy bridge" of a wireless charging system, and its performance directly determines the efficiency and stability of power transmission. The transmitting coil converts electrical energy into a magnetic field, while the receiving coil captures the magnetic field energy and converts it into current. The two form an energy transmission link through magnetic field coupling. The geometric parameters of the coil (such as diameter, number of turns, and winding density) and material properties (such as copper wire purity and insulation layer thickness) jointly affect the system's resonant frequency, impedance matching, and anti-interference capability. In small devices such as electric toothbrushes, the coil must also balance miniaturization and power density, satisfying both compact space layout and ensuring sufficient magnetic field coverage for reliable charging.

[0046] While traditional coils are indispensable in wireless charging, their design and manufacturing face multiple constraints, becoming a key bottleneck restricting industry upgrades. Traditional wound coils, to meet magnetic field strength requirements, often employ multi-layered stacked structures, making it difficult to compress their thickness and volume. In miniature devices such as electric toothbrushes, bulky coil modules encroach on the design space of battery compartments or waterproof sealing structures, forcing engineers to compromise between charging efficiency and product form factor. Furthermore, discrete coils require soldering to the PCB board via leads; under high-frequency operating conditions, the parasitic inductance of these leads can interfere with signal integrity, increasing the difficulty of electromagnetic compatibility (EMC) design.

[0047] To address the aforementioned technical bottlenecks, this application proposes a charging circuit, including a power processing circuit 01, a wireless charging circuit 02, and a charging control circuit 03. The wireless charging circuit 02 is connected to the output terminal of the power processing circuit 01. The wireless charging circuit 02 includes an inductor 21 and is used to wirelessly output the electrical energy from the power processing circuit 01. Unlike traditional wireless charging circuits 02, this application's wireless charging circuit 02 uses an inductor 21 instead of a coil. The inductor 21 has advantages such as small size, light weight, and ease of integration. Traditional wireless charging circuits 02 generally use multi-layer stacked coils as the medium for power transmission. However, this design not only makes the charging base relatively large but also makes further compression difficult, thus limiting the potential of wireless charging devices in terms of portability and space utilization. Furthermore, the multi-layer stacked coil structure increases manufacturing costs and complexity. By adopting an inductor 21, this application's wireless charging circuit 02 successfully solves the size and cost problems caused by traditional coil designs.

[0048] In essence, the miniaturized design of inductor 21 significantly reduces the overall size of the charging dock. This not only improves product portability but also allows wireless charging devices to adapt more flexibly to various application scenarios and space constraints. Simultaneously, the lightweight nature of inductor 21 reduces the overall weight of the charging dock, while its ease of integration simplifies and streamlines the design and manufacturing process of the wireless charging circuit 02, helping to reduce production costs, improve production efficiency, and promote the widespread adoption and application of wireless charging technology. Furthermore, the application of inductor 21 brings numerous other benefits. For example, inductor 21 exhibits lower losses and higher efficiency in high-frequency environments, which helps improve the transmission efficiency and energy utilization efficiency of wireless charging. Additionally, inductor 21 possesses excellent stability and reliability, ensuring a smooth wireless charging process.

[0049] Meanwhile, in this application, the wireless charging circuit 02 uses power switching devices in conjunction with the inductor 21 to further optimize the uniformity of the electromagnetic field distribution, effectively suppress the edge magnetic leakage problem common in traditional coil solutions, and improve the electromagnetic compatibility performance of the charging base.

[0050] Furthermore, this application significantly simplifies the circuit architecture and reduces hardware costs by combining the modular design of the power processing circuit 01 and the charging control circuit 03. The power processing circuit 01 processes the incoming electrical energy through processes such as voltage conversion, filtering, and rectification to provide stable and suitable power to the wireless charging circuit 02. Compared to traditional power processing circuits 01, this application's solution eliminates the need for a bulky transformer, achieving miniaturization and weight reduction. This not only saves material costs but also further reduces the overall size of the charging base, improving user portability and experience. Simultaneously, the transformerless design reduces the complexity and failure rate of the power processing circuit 01, improving circuit reliability and stability. The integration of rectification and buck functions ensures the stability and purity of the output power, providing a strong guarantee for the efficient operation of the wireless charging circuit 02. The charging control circuit 03, connected to the controlled end of the wireless charging circuit 02, drives the wireless charging circuit 02 to wirelessly output the power from the power processing circuit 01. Specifically, the charging control circuit 03 receives stable electrical energy from the power processing circuit 01 and dynamically adjusts the parameters of the output electrical energy, such as voltage, current and power, according to the needs of the wireless charging circuit 02 and external inputs (such as user commands, device status, etc.).

[0051] This application includes a power processing circuit 01, a wireless charging circuit 02, and a charging control circuit 03. The wireless charging circuit 02 includes an inductor 21. The charging circuit of this application uses the inductor 21 to replace the traditional coil as the core component of the wireless charging circuit 02. Combined with the modular design of the power processing circuit 01 and the charging control circuit 03, the circuit architecture is significantly simplified and the hardware cost is reduced. At the same time, the flatness of the inductor 21 is used to achieve a compact layout, which is suitable for the miniaturized charging dock requirements. The charging control circuit 03 dynamically drives and modulates the electrical energy, thereby improving the energy transmission efficiency and system stability.

[0052] In one embodiment, such as Figure 2 As shown, the wireless charging circuit 02 further includes:

[0053] A switching transistor 22 is connected to one end of an inductor 21, its controlled end is connected to the charging control circuit 03, and its output end is grounded, forming a complete current loop. The other end of the inductor 21 is connected to the output of the power processing circuit 01. The switching transistor 22 plays a crucial role in controlling power transmission in the wireless charging circuit 02. By continuously switching it on and off, it converts the DC power output from the power processing circuit 01 into AC power suitable for wireless charging. The fast response and precise control of the switching transistor 22 contribute to efficient power transmission and reduced energy loss, optimizes the uniformity of the electromagnetic field distribution, effectively suppresses the edge magnetic leakage problem common in traditional coil designs, and improves the electromagnetic compatibility performance of the charging base.

[0054] A capacitor, connected in parallel with inductor 21, forms a resonant circuit. Inductor 21 is one of the key components in the wireless charging circuit 02, used to store and release energy. In this circuit, one end of inductor 21 is connected to the input terminal of switching transistor 22, and the other end is connected to the output terminal of power processing circuit 01. The capacitor plays the role of storing and releasing electrical energy in the resonant circuit, forming an oscillating electromagnetic field together with inductor 21. By adjusting the capacitance value, the frequency and characteristics of the resonant circuit can be optimized, thereby improving the efficiency and stability of wireless charging. In addition, the capacitor can also help reduce electromagnetic interference and noise, improving the overall performance of the wireless charging circuit 02.

[0055] In this embodiment, the wireless charging circuit 02 forms a more complete and efficient power transmission system by incorporating components such as the switching transistor 22 and capacitors. The switching transistor 22 is responsible for controlling the transmission and conversion of electrical energy, and the capacitor and inductor 21 together constitute a resonant circuit, improving the efficiency and stability of wireless charging.

[0056] In one embodiment, the inductor 21 is an I-shaped inductor 21, which includes a magnetic core and a coil wound around the magnetic core. The coil generates an alternating magnetic field when energized, and is a core component for wireless power transmission. As the carrier of the coil, the I-shaped magnetic core ensures that the coil can be wound uniformly, avoiding coil concentration or looseness, thereby generating a stable alternating magnetic field and improving energy transmission efficiency. The I-shaped cross-section design of the magnetic core ensures that the coil is wound with uniform tension and avoids interlayer slippage. Compared with traditional cylindrical winding, the corner supports of the I-shaped structure improve the uniformity of coil distribution density and magnetic field uniformity.

[0057] Meanwhile, because the I-shaped inductor 21 adopts an integrated design, no additional space is needed to install the magnetic core. This means that the elimination of the need for additional ferrite core assembly and alignment simplifies the production process, reduces production costs, decreases reliance on high-precision molds and assembly equipment, and improves assembly efficiency, meeting the needs of large-scale mass production. It also reduces the thickness of the charging base and the weight of the ferrite core, thereby reducing the overall weight and improving portability and installation flexibility. Furthermore, it avoids the use of adhesives or mechanical clips, reducing performance degradation caused by process fluctuations and enhancing product reliability in vibration environments. Finally, the integrated design reduces the air gap between the magnetic core and the coil, optimizes the magnetic field distribution, and further improves magnetic coupling efficiency.

[0058] In one embodiment, the charging control circuit 03 includes:

[0059] The main control chip 31 is connected to the controlled terminal of the switching transistor 22. The main control chip 31 controls the switching transistor 22 to turn it on and off, driving the resonant circuit. The main control chip 31 is the brain of the charging control circuit 03; it receives instructions from external or internal sources and generates control signals based on these instructions. One output port of the main control chip 31 is connected to the controlled terminal of the switching transistor 22, controlling its on / off state by sending high and low level signals. Furthermore, the main control chip 31 monitors the operating status of the wireless charging circuit 02. If any abnormality is detected (such as overvoltage or overcurrent), it immediately takes measures (such as cutting off the power) to protect the device and the user's safety.

[0060] In one embodiment, such as Figure 3 As shown, the output terminal of the switching transistor 22 is grounded through a sampling resistor, which is connected in series between the output terminal of the switching transistor 22 and ground to collect the current signal flowing through the switching transistor 22. The charging control circuit 03 also includes a charging detection circuit 32. The input terminal of the charging detection circuit 32 is connected to one end of the sampling resistor through a first resistor, and the other end of the sampling resistor is grounded. The output terminal of the charging detection circuit 32 is electrically connected to the main control chip 31. The sampling resistor converts the current signal into a voltage signal based on the impedance of a conductor to current. When current flows through the sampling resistor, a certain voltage drop is generated across it. This voltage drop is proportional to the current and can therefore be used as a basis for current sampling. By measuring the voltage across the sampling resistor, the magnitude of the current flowing through the switching transistor 22 can be indirectly determined, thereby understanding the operating state of the wireless charging circuit 02.

[0061] The charging detection circuit 32 is used to acquire and amplify the voltage sampling signal of the sampling resistor and transmit the amplified voltage sampling signal to the main control chip 31. The main control chip 31 is also used to receive and determine the charging status of the external device based on the sampling signal of the charging detection circuit 32, and output corresponding control signals to the switching transistor 22. The main function of the charging detection circuit 32 is to acquire and amplify the voltage sampling signal on the sampling resistor. Since the voltage drop across the sampling resistor may be very small, direct measurement may not be accurate enough, so it needs to be amplified by the charging detection circuit 32. The amplified voltage sampling signal can more accurately reflect the working status of the wireless charging circuit 02, especially the charging status of the external device.

[0062] This can be understood as follows: the charging detection circuit 32 first samples the current in the wireless charging circuit 02 through a sampling resistor. The sampling resistor converts the current signal into a voltage signal, which is proportional to the current. The charging detection circuit 32 amplifies this voltage signal and sends the amplified voltage signal to the main control chip 31. Then, the voltage signal (proportional to current) is compared with a preset current threshold. These thresholds are usually set according to the characteristics of the wireless charging system and the charging needs of the external device. Compared with the preset current threshold, if the current is less than a certain low threshold, it may mean that the external device is not connected (no-load state); if the current is between the low threshold and the high threshold, it means that the external device is charging; if the current drops to near zero or below a certain very low threshold and remains so for a period of time, it may mean that the external device is fully charged or charging is complete.

[0063] In one embodiment, the charging detection circuit 32 includes a non-inverting amplifier. The non-inverting input of the non-inverting amplifier is connected to one end of a sampling resistor via a first resistor, and the other end of the sampling resistor is grounded. The resistance value of the first resistor should be selected based on the resistance value of the sampling resistor and the expected voltage sampling signal magnitude to ensure that the non-inverting amplifier can operate normally and accurately amplify the signal. The inverting input of the non-inverting amplifier is grounded via a second resistor, and the outputs of the non-inverting amplifier are connected to the inverting input via a feedback resistor. The resistance value of the second resistor is typically small to ensure that the inverting input can be stably grounded and to provide a stable reference potential to the non-inverting amplifier. The resistance value of the feedback resistor should be selected based on the required gain. By adjusting the resistance value of the feedback resistor, the gain of the non-inverting amplifier can be changed, thereby achieving precise control of the output signal.

[0064] Because the inverting amplifier has a very high input impedance, it can reproduce the signal source signal to the greatest extent possible, and it also has a very high amplification factor, allowing for signal adjustment. Since the voltage drop across the sampling resistor may be very small, direct measurement may not be accurate enough; therefore, it needs to be amplified by the inverting amplifier. Through the negative feedback resistor, the inverting amplifier can stabilize its gain and output, reducing output fluctuations caused by changes in the input signal. The inverting amplifier typically has a high input impedance, which reduces the impact on the input signal source, thus ensuring measurement accuracy. In this embodiment, the charging detection circuit 32 uses an inverting amplifier to amplify the voltage sampling signal across the sampling resistor, achieving accurate monitoring of the charging status of the external device. This not only improves measurement accuracy but also enhances circuit stability and reliability through the application of the negative feedback resistor.

[0065] In one embodiment, such as Figure 2 As shown, the power processing circuit 01 includes:

[0066] A rectifier circuit 11 is included, with its input connected to an external power source. The rectifier circuit 11 converts the external power source into DC voltage. Its main function is to convert AC power to DC power. This is typically achieved using rectifier components such as diodes, ensuring a fixed polarity of the power supply. Furthermore, a fuse circuit is included at the front end of the rectifier circuit 11. This fuse circuit can quickly disconnect the circuit when the current exceeds a preset threshold, preventing damage to the rectifier circuit 11 and other related components due to overcurrent. This is the most basic and important function of the fuse circuit. When a short circuit occurs, the current increases sharply. The fuse circuit can respond quickly and disconnect the circuit, preventing fires or other safety accidents caused by the short circuit. When the load in the circuit is too large, the current also increases accordingly. The fuse circuit can provide protection in this situation, ensuring that the circuit is not damaged by overload.

[0067] A DC-DC converter circuit 12 has its input terminal connected to the output terminal of the rectifier circuit 11, and its output terminal connected to the power input terminals of the wireless charging circuit 02 and the charging control circuit 03. The DC-DC converter circuit 12 converts the DC voltage output by the rectifier circuit 11 into a low-voltage DC voltage to power the wireless charging circuit 02 and the charging control circuit 03. The main function of the DC-DC converter circuit 12 is to convert the input DC voltage into the required low-voltage DC voltage. This is typically achieved using conversion components such as switching power supplies, which are highly efficient and energy-saving. In some cases, the DC-DC converter circuit 12 can also provide electrical isolation, protecting the wireless charging circuit 02 and the charging control circuit 03 from interference and damage from external power sources.

[0068] In this embodiment, the power processing circuit 01, through the coordinated operation of the rectifier circuit 11 and the DC-DC conversion circuit 12, converts external power into a low-voltage DC voltage suitable for use by the wireless charging circuit 02 and the charging control circuit 03, eliminating the need for a bulky transformer and thus achieving circuit miniaturization and weight reduction. This not only saves material costs but also further reduces the overall size of the charging base, improving user portability and user experience. Simultaneously, the transformerless design reduces the complexity and failure rate of the power processing circuit 01, improving circuit reliability and stability. The integration of rectification and buck functions ensures the stability and purity of the output power, providing a strong guarantee for the efficient operation of the wireless charging circuit 02.

[0069] Furthermore, this application also proposes a charging dock, which includes a housing and a charging circuit as described above; the charging circuit is disposed within the housing. The charging circuit includes: a power processing circuit 01, used to process and output the received electrical energy; a wireless charging circuit 02, connected to the output terminal of the power processing circuit 01, the wireless charging circuit 02 including an inductor 21, the wireless charging circuit 02 used to wirelessly output the electrical energy output by the power processing circuit 01; and a charging control circuit 03, connected to the controlled terminal of the wireless charging circuit 02, used to drive the wireless charging circuit 02 to wirelessly output the electrical energy output by the power processing circuit 01. The charging circuit of this application uses an inductor 21 instead of a traditional coil as the core component of the wireless charging circuit 02. Combined with the modular design of the power processing circuit 01 and the charging control circuit 03, the circuit architecture is significantly simplified, hardware costs are reduced, and the flatness of the inductor 21 enables a compact layout, adapting to the needs of miniaturized charging docks. The dynamic driving and modulation of electrical energy by the charging control circuit 03 improves energy transmission efficiency and system stability.

[0070] Furthermore, this application also proposes a toothbrush assembly, including an electric toothbrush and a charging base as described above. The electric toothbrush is the main part of the toothbrush assembly, and it is typically equipped with a replaceable or rechargeable battery to power the toothbrush motor, thereby driving the brush head to vibrate or rotate to achieve the effect of cleaning teeth. The charging base is responsible for providing charging services for the electric toothbrush. As mentioned earlier, the charging base of this application may contain key components such as a power processing circuit 01, a charging control circuit 03, and a wireless charging circuit 02 to ensure safe and efficient charging of the electric toothbrush.

[0071] In one embodiment of a toothbrush assembly, a receiver is further included, disposed within the electric toothbrush. The receiver receives the charging signal generated by the wireless charging circuit 02 and converts it into electrical energy. The electric toothbrush, as the main body of the toothbrush assembly, is equipped with a rechargeable battery and a receiver for receiving wireless charging signals. The receiver is typically located at the bottom of the electric toothbrush, corresponding to the wireless charging circuit 02 on the charging base, to ensure accurate transmission of the charging signal. The receiver is a key component inside the electric toothbrush, typically consisting of a coil, a rectifier circuit 11, a filter circuit, and possibly a power regulation circuit. When the electric toothbrush is placed on the charging base, the coil in the receiver receives the magnetic field signal generated by the wireless charging circuit 02 on the charging base. Through processing by the rectifier circuit 11 and the filter circuit, the receiver converts the received magnetic field signal into electrical energy and stores it in the electric toothbrush's battery.

[0072] The charging process for the toothbrush assembly involves the user placing the electric toothbrush on the charging base, ensuring alignment between the receiver and the wireless charging circuit 02. The wireless charging circuit 02 of the charging base then activates, generating a magnetic field signal. Upon receiving the magnetic field signal, the receiver inside the electric toothbrush converts it into electrical energy through the rectifier circuit 11 and the filter circuit. This electrical energy is stored in the electric toothbrush's battery, providing power for the next use. When the battery is fully charged or reaches a preset charging state, the charging base may stop the transmission of the wireless charging signal through the charging detection circuit 32 and / or the power regulation circuit inside the receiver. The user can then remove the electric toothbrush for use.

[0073] 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 charging circuit applied to a charging base, characterized in that, include: Power processing circuit, used to process the incoming electrical energy and then output it; A wireless charging circuit is connected to the output terminal of the power processing circuit. The wireless charging circuit includes an inductor and is used to wirelessly output the electrical energy output by the power processing circuit. A charging control circuit, connected to the controlled terminal of the wireless charging circuit, is used to drive the wireless charging circuit to wirelessly output the electrical energy output by the power processing circuit.

2. The charging circuit of claim 1, wherein, The wireless charging circuit also includes: A switching transistor, the input terminal of which is connected to one end of the inductor, the controlled terminal of which is connected to the charging control circuit, and the output terminal of which is grounded; the other end of the inductor is connected to the output terminal of the power processing circuit. A capacitor is connected in parallel with the inductor to form a resonant circuit.

3. The charging circuit of claim 1, wherein, The inductor is an I-shaped inductor, which includes a magnetic core and a coil wound around the magnetic core.

4. The charging circuit of claim 2, wherein, The charging control circuit includes: The main control chip is connected to the controlled terminal of the switching transistor. The main control chip is used to control the switching transistor to turn on / off, so as to drive the resonant circuit to work.

5. The charging circuit of claim 4, wherein, The output terminal of the switching transistor is grounded through a sampling resistor, and the charging control circuit further includes: The charging detection circuit has its input terminal connected to one end of the sampling resistor via a first resistor, the other end of the sampling resistor being grounded, and its output terminal being electrically connected to the main control chip. The charging detection circuit is used to acquire and amplify the voltage sampling signal of the sampling resistor and transmit the amplified voltage sampling signal to the main control chip; the main control chip is also used to receive and determine the charging status of the external device based on the sampling signal of the charging detection circuit, and output corresponding control signals to the switching transistor.

6. The charging circuit of claim 5, wherein, The charging detection circuit includes a non-inverting amplifier, the non-inverting input terminal of which is connected to one end of a sampling resistor via a first resistor, and the other end of the sampling resistor is grounded. The inverting input terminal of the non-inverting amplifier is grounded through a second resistor, and the output terminals of the non-inverting amplifier are connected to the inverting input terminal through a feedback resistor.

7. The charging circuit of claim 1, wherein, The power processing circuit includes: A rectifier circuit, the input terminal of which is connected to an external power supply, is used to convert the external power supply into DC voltage; The DC-DC conversion circuit has its input terminal connected to the output terminal of the rectifier circuit, and its output terminal connected to the power input terminal of the wireless charging circuit and the charging control circuit. The DC-DC conversion circuit is used to convert the DC voltage output by the rectifier circuit into a low-voltage DC voltage to power the wireless charging circuit and the charging control circuit.

8. A charging base, comprising: The charging base includes a housing and a charging circuit as described in any one of claims 1 to 7; The charging circuit is housed inside the casing.

9. A toothbrush assembly characterized by, Includes an electric toothbrush and the charging base as described in claim 8.

10. The toothbrush assembly of claim 9, wherein, Also includes: The receiver is located inside the electric toothbrush and is used to receive the charging signal generated by the wireless charging circuit and convert it into electrical energy.

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