Charging seat circuit and charging seat

Abstract

The utility model discloses a charging seat circuit and a charging seat, and relates to the technical field of charging equipment. The charging seat circuit comprises a power supply input end, a wireless charging circuit, a fan driving circuit, a placement detection circuit and a main control circuit. The placement detection circuit can detect the placement condition of the electric toothbrush on the charging base and output a corresponding placement detection signal. When the main control circuit detects that the electric toothbrush is placed on the charging seat according to the placement detection signal, the wireless charging circuit and / or the fan driving circuit are / is controlled to work. The wireless charging circuit can convert a power supply into a wireless charging signal and output the wireless charging signal to charge the electric toothbrush. The fan driving circuit can drive the fan to rotate and drive airflow to act on bristles of the brush head of the electric toothbrush so as to air the bristles. Therefore, the air drying function can be provided while the electric toothbrush is wirelessly charged, and moisture can be effectively prevented from being accumulated on the surface of the toothbrush for a long time, so that bacterium breeding is avoided.

Description

Technical Field

[0001] This utility model relates to the field of charging equipment technology, and in particular to a charging base circuit and a charging base. Background Technology

[0002] As people's living standards improve, more and more users are choosing electric toothbrushes instead of traditional toothbrushes to improve oral hygiene. Electric toothbrushes offer a more efficient cleaning method, helping users effectively remove plaque and achieve better oral care results.

[0003] Current electric toothbrushes typically use a charging base for charging, and users place the toothbrush on the base after use. At this time, moisture often remains on the toothbrush surface. If not dried promptly, this moisture buildup can easily breed bacteria, affecting oral hygiene and reducing the toothbrush's lifespan. Utility Model Content

[0004] The main purpose of this invention is to provide a charging base circuit that solves the problem that existing electric toothbrush charging bases fail to dry the toothbrush in time after use while charging it.

[0005] To achieve the above objectives, this utility model proposes a charging dock circuit, the charging dock including a fan, and the charging dock circuit including:

[0006] Power input terminal, used to input power supply;

[0007] A wireless charging circuit, wherein the input terminal of the wireless charging circuit is connected to the power supply input terminal, the output terminal of the wireless charging circuit is used to wirelessly connect to the charging signal receiving terminal of the electric toothbrush, and the wireless charging circuit is used to convert the power supply into a wireless charging signal output to charge the electric toothbrush.

[0008] A fan drive circuit, wherein the power supply terminal of the fan drive circuit is connected to the power supply input terminal, the drive terminal of the fan drive circuit is connected to the fan, and the fan drive circuit is used to drive the rotation of the fan;

[0009] A placement detection circuit is provided, wherein the power supply terminal of the placement detection circuit is connected to the power supply input terminal, and the placement detection circuit is used to detect the placement status of the electric toothbrush on the charging base and output a corresponding placement detection signal.

[0010] The main control circuit is connected to the power input terminal, the controlled terminal of the wireless charging circuit, the controlled terminal of the fan drive circuit, and the signal output terminal of the placement detection circuit. The main control circuit is used to control the wireless charging circuit and / or the fan drive circuit to work when the electric toothbrush is detected to be placed on the charging base according to the placement detection signal.

[0011] In one embodiment, the placement detection circuit includes:

[0012] A pressure detection circuit is provided, wherein the power supply terminal of the pressure detection circuit is connected to the power supply input terminal, and the signal output terminal of the pressure detection circuit is connected to the main control circuit. The pressure detection circuit is used to detect pressure changes on the charging dock and output corresponding pressure detection signals.

[0013] The main control circuit is used to control the wireless charging circuit and / or the fan drive circuit to operate when the pressure detection signal detects that the electric toothbrush is placed on the charging base.

[0014] In one embodiment, the pressure detection circuit includes a first pressure-sensitive resistor, a second pressure-sensitive resistor, a third pressure-sensitive resistor, and a fourth pressure-sensitive resistor;

[0015] Specifically, the first power supply terminal of the pressure detection circuit, one end of the first pressure-sensitive resistor, and one end of the second pressure-sensitive resistor are connected; the first output terminal of the pressure detection circuit, the other end of the second pressure-sensitive resistor, and one end of the fourth pressure-sensitive resistor are connected; the ground terminal of the pressure detection circuit, the other end of the fourth pressure-sensitive resistor, and one end of the third pressure-sensitive resistor are connected; and the second output terminal of the pressure detection circuit, the other end of the third pressure-sensitive resistor, and the other end of the first pressure-sensitive resistor are connected.

[0016] In one embodiment, the fan drive circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a second capacitor, a third capacitor, a first switching transistor, and a first diode;

[0017] Wherein, one end of the first capacitor and one end of the first resistor are connected to the first feedback signal input terminal of the main control circuit; the other end of the first resistor, one end of the second capacitor, and one end of the second resistor are connected to the first terminal of the first switching transistor; the other end of the first capacitor, the other end of the second capacitor, and the other end of the second resistor are grounded to one end of the third resistor; the controlled terminal of the first switching transistor and the other end of the third resistor are electrically connected to one end of the fourth resistor; the other end of the fourth resistor is connected to the first signal output terminal of the main control circuit; the second terminal of the first switching transistor, the anode of the first diode, and one end of the third capacitor are connected to the first terminal of the fan; the second terminal of the fan, the other end of the third capacitor, and the cathode of the first diode are connected to the power input terminal of the fan drive circuit.

[0018] In one embodiment, the first switch is an NMOS transistor, the gate of the NMOS transistor is the controlled terminal of the first switch, the source of the NMOS transistor is the first terminal of the first switch, and the drain of the NMOS transistor is the second terminal of the first switch.

[0019] In one embodiment, the wireless charging circuit includes an operational amplifier, a second switching transistor, a fifth resistor, a sixth resistor, a seventh resistor, a fourth capacitor, a fifth capacitor, and a first inductor;

[0020] The controlled terminal of the second switching transistor is connected to the second signal output terminal of the main control circuit. The first terminal of the second switching transistor, one terminal of the fourth capacitor, and one terminal of the first inductor are connected to each other. The other terminal of the fourth capacitor and the other terminal of the first inductor are connected to the power input terminal of the wireless charging circuit. The second terminal of the second switching transistor and one terminal of the fifth resistor are connected to the first input terminal of the operational amplifier. The other terminal of the fifth resistor is grounded. The second input terminal of the operational amplifier, one terminal of the sixth resistor, and one terminal of the seventh resistor are connected to one terminal of the fifth capacitor. The other terminal of the sixth resistor is grounded. The other terminal of the seventh resistor, the other terminal of the fifth capacitor, and the output terminal of the operational amplifier are connected to the second feedback signal input terminal of the main control circuit.

[0021] In one embodiment, the wireless charging circuit further includes an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, and a sixth capacitor;

[0022] One end of the eighth resistor is connected to the second signal output terminal of the main control circuit. The other end of the eighth resistor and one end of the ninth resistor are connected to the controlled terminal of the second switching transistor. One end of the tenth resistor and the second terminal of the second switching transistor are connected to one end of the fifth resistor. The other end of the tenth resistor and one end of the sixth capacitor are connected to the first input terminal of the operational amplifier. The other end of the sixth capacitor is grounded. One end of the eleventh resistor is connected to the output terminal of the operational amplifier. The other end of the eleventh resistor is connected to the second feedback signal input terminal of the main control circuit.

[0023] In one embodiment, the charging dock circuit further includes:

[0024] A voltage regulator circuit is provided, wherein the input terminal of the voltage regulator circuit is connected to the power supply input terminal, and the output terminal of the voltage regulator circuit is connected to the main control circuit. The voltage regulator circuit is used to regulate the power supply before outputting it.

[0025] In one embodiment, the voltage regulator circuit includes a seventh capacitor, an eighth capacitor, a second inductor, a third inductor, and a voltage regulator chip;

[0026] One end of the seventh capacitor and one end of the second inductor are connected to the first input terminal of the voltage regulator circuit. The other end of the seventh capacitor and one end of the third inductor are connected to the second input terminal of the voltage regulator circuit. The other end of the second inductor and one end of the eighth capacitor are connected to the input terminal of the voltage regulator chip. The other end of the third inductor and the other end of the eighth capacitor are grounded to the ground terminal of the voltage regulator chip. The output terminal of the voltage regulator chip is the output terminal of the voltage regulator circuit.

[0027] This utility model also proposes a charging stand, which includes a fan and the charging stand circuit described above; the fan is connected to the drive end of the fan drive circuit.

[0028] This utility model employs a charging base circuit, which includes a fan. The charging base circuit comprises a power input terminal, a wireless charging circuit, a fan drive circuit, a placement detection circuit, and a main control circuit. The placement detection circuit detects the placement of the electric toothbrush on the charging base and outputs a corresponding placement detection signal. When the main control circuit detects that the electric toothbrush is placed on the charging base based on the placement detection signal, it controls the wireless charging circuit to operate. At this time, the wireless charging circuit converts the power supply into a wireless charging signal output to charge the electric toothbrush. And / or, when the electric toothbrush is detected to be placed on the charging base, the main control circuit controls the fan drive circuit to operate for a preset time, driving the fan to rotate within the preset time, causing airflow to act on the bristles of the electric toothbrush head, drying them, and preventing moisture from accumulating on the bristles and causing bacterial growth. Compared with the prior art, this utility model can charge the electric toothbrush through a wireless charging circuit when it detects that the electric toothbrush is placed on the charging base. While providing the charging function, it can also drive the fan to rotate through the fan drive circuit, thereby drying the electric toothbrush and preventing moisture from accumulating on the toothbrush surface for a long time. This can effectively prevent moisture from accumulating on the toothbrush surface for a long time, thereby avoiding bacterial growth. Attached Figure Description

[0029] 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.

[0030] Figure 1 A schematic diagram of the structure of an embodiment of the charging dock circuit provided by this utility model;

[0031] Figure 2 An electronic circuit diagram of the pressure detection circuit of an embodiment of the charging base circuit provided by this utility model;

[0032] Figure 3 An electronic circuit diagram of a fan drive circuit according to an embodiment of the charging dock circuit provided by this utility model;

[0033] Figure 4 An electronic circuit diagram of a wireless charging circuit according to an embodiment of the charging dock circuit provided by this utility model;

[0034] Figure 5 The electronic circuit diagram of the voltage regulator circuit and the main control circuit of one embodiment of the charging dock circuit provided by this utility model.

[0035] Explanation of icon numbers:

[0036]

[0037] 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

[0038] 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.

[0039] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0040] Furthermore, the use of terms such as "first" and "second" in this utility model is 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, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0041] Current electric toothbrushes typically use a charging base for charging, and users place the toothbrush on the base after use. At this time, moisture often remains on the toothbrush surface. If not dried promptly, this moisture buildup can easily breed bacteria, affecting oral hygiene and reducing the toothbrush's lifespan.

[0042] This utility model proposes a charging dock circuit.

[0043] Please see Figure 1 In one embodiment of this utility model, the charging dock includes a fan, and the charging dock circuit includes:

[0044] Power input terminal, used to input power supply;

[0045] The wireless charging circuit 10 has an input terminal connected to a power input terminal and an output terminal used to wirelessly connect to the charging signal receiver of the electric toothbrush. The wireless charging circuit 10 is used to convert the power supply into a wireless charging signal output to charge the electric toothbrush.

[0046] The fan drive circuit 20 has its power supply terminal connected to the power input terminal and its drive terminal connected to the fan. The fan drive circuit 20 is used to drive the fan to rotate.

[0047] The placement detection circuit 30 is connected to the power supply input terminal. The placement detection circuit 30 is used to detect the placement status of the electric toothbrush on the charging base and output the corresponding placement detection signal.

[0048] The main control circuit 40 is connected to the power input terminal, the controlled terminal of the wireless charging circuit 10, the controlled terminal of the fan drive circuit 20, and the signal output terminal of the placement detection circuit 30. The main control circuit 40 is used to control the wireless charging circuit 10 and / or the fan drive circuit 20 to work when the electric toothbrush is detected to be placed on the charging base according to the placement detection signal.

[0049] It should be noted that the fan can be positioned on the charging dock corresponding to the electric toothbrush head, i.e., the side facing the bristles. This ensures that the airflow acts directly on the bristle area, improving drying efficiency. A guide structure can be installed in front of the fan to direct the airflow to cover the bristle area more concentratedly.

[0050] In this embodiment, the wireless charging circuit 10 may include components such as switching transistors, capacitors, and inductors. The capacitors and inductors can form an LC oscillation circuit, emitting a wireless oscillation signal of a specific frequency. The charging signal receiver of the electric toothbrush can receive this oscillation signal for charging. The fan drive circuit 20 may include components such as switching transistors, resistors, and capacitors. The drive end is connected to the fan motor M to control the fan speed and start / stop. The placement detection circuit 30 can detect the placement of the electric toothbrush on the charging dock using sensors (such as infrared diodes, Hall effect sensors, pressure sensors, etc.) and generate an electrical signal accordingly. The main control circuit 40 may include a main control chip U1, which can be an MCU chip or an FPGA chip, etc., and controls the operation of the wireless charging circuit 10 and the fan drive circuit 20 by outputting PWM signals with different duty cycles.

[0051] In this embodiment, when the user places the used electric toothbrush on the charging base, the placement detection circuit 30 can detect that the electric toothbrush is placed on the charging base and output a corresponding placement detection signal. Based on the placement detection signal, the main control circuit 40 detects that the electric toothbrush is placed on the charging base and controls the wireless charging circuit 10 to operate. The wireless charging circuit 10 converts the power supply into a wireless charging signal output to charge the electric toothbrush. And / or, when the electric toothbrush is detected to be placed on the charging base, the main control circuit 40 controls the fan drive circuit 20 to operate for a preset time, driving the fan to rotate within the preset time, causing airflow to act on the bristles of the electric toothbrush head to dry them and prevent moisture from accumulating on the bristles and causing bacterial growth.

[0052] It should be noted that the main control circuit 40 can preset the working time of the fan drive circuit 20, that is, the working time of the fan. For example, the fan is driven to rotate for the first minute after the electric toothbrush is placed, and then the drive is stopped after one minute, so as to save energy while ensuring the drying effect.

[0053] In this invention, the placement detection circuit 30 can detect the placement of the electric toothbrush on the charging base and output a corresponding placement detection signal. When the main control circuit 40 detects that the electric toothbrush is placed on the charging base according to the placement detection signal, it controls the wireless charging circuit 10 to operate. At this time, the wireless charging circuit 10 converts the power supply into a wireless charging signal output to charge the electric toothbrush. And / or, when the electric toothbrush is detected to be placed on the charging base, the main control circuit 40 controls the fan drive circuit 20 to operate for a preset time, driving the fan to rotate within the preset time, causing airflow to act on the bristles of the electric toothbrush head, drying them, and preventing moisture from accumulating on the bristles for a long time and breeding bacteria. Compared with the prior art, this invention, when the electric toothbrush is detected to be placed on the charging base, can charge the electric toothbrush through the wireless charging circuit 10, and while providing charging function, can also drive the fan to rotate through the fan drive circuit 20 to dry the electric toothbrush, preventing moisture from accumulating on the toothbrush surface for a long time, thus effectively preventing moisture accumulation on the toothbrush surface and avoiding bacterial growth.

[0054] Please see Figure 2 In one embodiment of this utility model, the placement detection circuit 30 includes:

[0055] The pressure detection circuit 31 has its power supply terminal connected to the power supply input terminal and its signal output terminal connected to the main control circuit 40. The pressure detection circuit 31 is used to detect pressure changes on the charging base and output corresponding pressure detection signals.

[0056] The main control circuit 40 is used to control the wireless charging circuit 10 and / or the fan drive circuit 20 to operate when the electric toothbrush is detected to be placed on the charging base based on the pressure detection signal.

[0057] In this embodiment, the pressure detection circuit 31 may include a pressure sensor and a signal conditioning circuit for amplification, filtering, analog-to-digital conversion and other operations. The pressure sensor may use components such as pressure-sensitive resistors and strain gauges to convert mechanical pressure into a measurable electrical signal. The signal conditioning circuit can ensure that the output pressure detection signal is accurate.

[0058] In one embodiment, the pressure detection circuit 31 includes a first pressure-sensitive resistor RV1, a second pressure-sensitive resistor RV2, a third pressure-sensitive resistor RV3, and a fourth pressure-sensitive resistor RV4;

[0059] Specifically, the first power supply terminal of the pressure detection circuit 31, one end of the first pressure-sensitive resistor RV1, and one end of the second pressure-sensitive resistor RV2 are connected; the first output terminal of the pressure detection circuit 31, the other end of the second pressure-sensitive resistor RV2, and one end of the fourth pressure-sensitive resistor RV4 are connected; the ground terminal of the pressure detection circuit 31, the other end of the fourth pressure-sensitive resistor RV4, and one end of the third pressure-sensitive resistor RV3 are connected; and the second output terminal of the pressure detection circuit 31, the other end of the third pressure-sensitive resistor RV3, and the other end of the first pressure-sensitive resistor RV1 are connected.

[0060] In this embodiment, when no external pressure is applied, the resistance values ​​of all pressure-sensitive resistors can be the same, and the bridge circuit is in a balanced state. At this time, the voltage difference between the first output terminal PV1 and the second output terminal PV2 is zero. When the electric toothbrush is placed on the charging base and pressure is applied to a specific position, the resistance values ​​of at least one or more pressure-sensitive resistors will change, disrupting the balance of the bridge circuit and causing a voltage difference between the first output terminal PV1 and the second output terminal PV2. Thus, the main control circuit 40 can determine whether the electric toothbrush is placed on the charging base by measuring the voltage difference between the two output terminals of the pressure detection circuit 31. For example, when the voltage between the two output terminals of the pressure detection circuit 31 is detected to be greater than or equal to a preset voltage, it is considered that the electric toothbrush is placed on the charging base; when the voltage between the two output terminals of the pressure detection circuit 31 is detected to be less than the preset voltage, it is considered that the electric toothbrush is not placed on the charging base.

[0061] Please see Figure 3 In one embodiment of the present invention, the fan drive circuit 20 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first switching transistor Q1, and a first diode D1.

[0062] In this circuit, one end of the first capacitor C1 and one end of the first resistor R1 are connected to the first feedback signal input terminal of the main control circuit 40; the other end of the first resistor R1, one end of the second capacitor C2, and one end of the second resistor R2 are connected to the first terminal of the first switch Q1; the other end of the first capacitor C1, the other end of the second capacitor C2, and the other end of the second resistor R2 are grounded to one end of the third resistor R3; the controlled terminal of the first switch Q1 and the other end of the third resistor R3 are electrically connected to one end of the fourth resistor R4; the other end of the fourth resistor R4 is connected to the first signal output terminal of the main control circuit 40; the second terminal of the first switch Q1, the positive terminal of the first diode D1, and one end of the third capacitor C3 are connected to the first terminal of the fan; the second terminal of the fan, the other end of the third capacitor C3, and the negative terminal of the first diode D1 are connected to the power input terminal of the fan drive circuit 20.

[0063] In one feasible embodiment, the first switch Q1 is an NMOS transistor, the gate of the NMOS transistor is the controlled terminal of the first switch Q1, the source of the NMOS transistor is the first terminal of the first switch Q1, and the drain of the NMOS transistor is the second terminal of the first switch Q1.

[0064] In this embodiment, the main control circuit 40 can input a MOTOR signal via the MOTOR terminal and receive feedback signals via the AD terminal. Once the current value fed back from the AD terminal exceeds a preset current value, it can control the fan drive circuit 20 to stop working, providing protection. In this embodiment, when the MOTOR signal (i.e., the PWM2 signal) input to the main control circuit 40 is high, the first NMOS transistor Q1 is turned on, and voltage is applied to the two ends of the fan motor M. As current flows through the motor M, the fan starts to rotate, providing the necessary airflow to dry the bristles of the electric toothbrush. When the MOTOR signal input to the main control circuit 40 is low, the first NMOS transistor Q1 is turned off, and voltage is no longer applied to the two ends of the motor M. Thus, by outputting PWM signals with different duty cycles, the average voltage acting on the motor M can be controlled, thereby controlling the rotation of the motor M. Furthermore, by continuously outputting a low-level PWM signal, the motor M can be controlled to stop rotating. When the motor M stalls, an abnormal current is output to the main control circuit 40 via the AD terminal, and the main control circuit 40 can control the fan drive circuit 20 to stop working, thereby enhancing circuit safety. The first diode D1 protects the circuit from reverse voltage damage, and the third capacitor C3 filters out high-frequency noise in the power supply, ensuring that the fan motor M receives a stable DC voltage.

[0065] Please see Figure 4 In one embodiment of the present invention, the wireless charging circuit 10 includes an operational amplifier OP, a second switch Q2, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a fourth capacitor C4, a fifth capacitor C5, and a first inductor L1.

[0066] The controlled terminal of the second switch Q2 is connected to the second signal output terminal of the main control circuit 40. The first terminal of the second switch Q2 and one terminal of the fourth capacitor C4 are connected to one terminal of the first inductor L1. The other terminal of the fourth capacitor C4 and the other terminal of the first inductor L1 are connected to the power input terminal of the wireless charging circuit 10. The second terminal of the second switch Q2 and one terminal of the fifth resistor R5 are connected to the first input terminal of the operational amplifier OP. The other terminal of the fifth resistor R5 is grounded. The second input terminal of the operational amplifier OP, one terminal of the sixth resistor R6 and one terminal of the seventh resistor R7 are connected to one terminal of the fifth capacitor C5. The other terminal of the sixth resistor R6 is grounded. The other terminal of the seventh resistor R7, the other terminal of the fifth capacitor C5, and the output terminal of the operational amplifier OP are connected to the second feedback signal input terminal of the main control circuit 40.

[0067] In one feasible embodiment, the wireless charging circuit 10 further includes an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, and a sixth capacitor C6.

[0068] One end of the eighth resistor R8 is connected to the second signal output terminal of the main control circuit 40. The other end of the eighth resistor R8 and one end of the ninth resistor R9 are connected to the controlled terminal of the second switch Q2. One end of the tenth resistor R10 and the second terminal of the second switch Q2 are connected to one end of the fifth resistor R5. The other end of the tenth resistor R10 and one end of the sixth capacitor C6 are connected to the first input terminal of the operational amplifier OP. The other end of the sixth capacitor C6 is grounded. One end of the eleventh resistor R11 is connected to the output terminal of the operational amplifier OP. The other end of the eleventh resistor R11 is connected to the second feedback signal input terminal of the main control circuit 40.

[0069] In this embodiment, the fourth capacitor C4 and the first inductor L1 form an LC oscillation circuit. The main control circuit 40 can output a PWM1 signal to control the conduction frequency of the second switch Q2, thereby controlling the transmission of the wireless charging signal from the wireless charging circuit 10. At this time, a current of corresponding intensity flows through the second switch Q2. The non-inverting input of the operational amplifier OP can sample the current magnitude of the wireless charging circuit 10, which corresponds to the transmission intensity of the wireless charging signal. This sampled voltage is amplified by the operational amplifier OP and fed back to the main control circuit 40 via the ADC terminal. The seventh resistor R7 and the fifth capacitor C5 can be configured to adjust the amplification gain. The main control circuit 40 can receive this current feedback signal and, when the current feedback signal exceeds a preset value, reduces the duty cycle of the output PWM1 signal or stops outputting the PWM1 signal. Thus, the wireless charging circuit 10 in this embodiment has overcurrent protection, enhancing safety. The second switch Q2 can be an NMOS transistor, which has a faster switching speed and can efficiently control the transmission of the wireless charging signal. In this embodiment, the eighth resistor R8, the ninth resistor R9, the tenth resistor R10, and the eleventh resistor R11 can be used for current limiting, and the sixth capacitor C6 can be used for filtering, which can enhance the stability of the circuit.

[0070] Please see Figure 5 In one embodiment of this utility model, the charging dock circuit further includes:

[0071] The voltage regulator circuit 50 has its input terminal connected to the power supply input terminal and its output terminal connected to the main control circuit 40. The voltage regulator circuit 50 is used to regulate the power supply before outputting it.

[0072] In one feasible embodiment, the voltage regulator circuit 50 includes a seventh capacitor C7, an eighth capacitor C8, a second inductor L2, a third inductor L3, and a voltage regulator chip U2;

[0073] One end of the seventh capacitor C7 and one end of the second inductor L2 are connected to the first input terminal of the voltage regulator circuit 50. The other end of the seventh capacitor C7 and one end of the third inductor L3 are connected to the second input terminal of the voltage regulator circuit 50. The other end of the second inductor L2 and one end of the eighth capacitor C8 are connected to the input terminal of the voltage regulator chip U2. The other end of the third inductor L3 and the other end of the eighth capacitor C8 are grounded to the ground terminal of the voltage regulator chip U2. The output terminal of the voltage regulator chip U2 is the output terminal of the voltage regulator circuit 50.

[0074] In this embodiment, the seventh capacitor C7, the eighth capacitor C8, the second inductor L2, and the third inductor L3 can smooth the input power supply, thereby purifying the input power. The voltage regulator chip U2 receives these relatively pure input voltages and converts them into a more stable output voltage, which is unaffected by input voltage fluctuations or load changes. Thus, even if the DC power supply voltage input from the USB interface changes, the voltage regulator chip U2 ensures that the voltage output to subsequent circuits remains within a stable range, guaranteeing the power supply safety of the main control circuit 40.

[0075] This utility model also proposes a charging dock, which includes a fan and a charging dock circuit. The specific structure of the charging dock circuit is as described in the above embodiments. The fan is connected to the drive end of the fan drive circuit. Since this charging dock adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0076] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A charging dock circuit, characterized in that, The charging dock includes a fan, and the charging dock circuit includes: Power input terminal, used to input power supply; A wireless charging circuit, wherein the input terminal of the wireless charging circuit is connected to the power supply input terminal, the output terminal of the wireless charging circuit is used to wirelessly connect to the charging signal receiving terminal of the electric toothbrush, and the wireless charging circuit is used to convert the power supply into a wireless charging signal output to charge the electric toothbrush. A fan drive circuit, wherein the power supply terminal of the fan drive circuit is connected to the power supply input terminal, the drive terminal of the fan drive circuit is connected to the fan, and the fan drive circuit is used to drive the rotation of the fan; A placement detection circuit is provided, wherein the power supply terminal of the placement detection circuit is connected to the power supply input terminal, and the placement detection circuit is used to detect the placement status of the electric toothbrush on the charging base and output a corresponding placement detection signal. The main control circuit is connected to the power input terminal, the controlled terminal of the wireless charging circuit, the controlled terminal of the fan drive circuit, and the signal output terminal of the placement detection circuit. The main control circuit is used to control the wireless charging circuit and / or the fan drive circuit to work when the electric toothbrush is detected to be placed on the charging base according to the placement detection signal.

2. The charging dock circuit as described in claim 1, characterized in that, The placement detection circuit includes: A pressure detection circuit is provided, wherein the power supply terminal of the pressure detection circuit is connected to the power supply input terminal, and the signal output terminal of the pressure detection circuit is connected to the main control circuit. The pressure detection circuit is used to detect pressure changes on the charging dock and output corresponding pressure detection signals. The main control circuit is used to control the wireless charging circuit and / or the fan drive circuit to operate when the pressure detection signal detects that the electric toothbrush is placed on the charging base.

3. The charging dock circuit as described in claim 2, characterized in that, The pressure detection circuit includes a first pressure-sensitive resistor, a second pressure-sensitive resistor, a third pressure-sensitive resistor, and a fourth pressure-sensitive resistor; Specifically, the first power supply terminal of the pressure detection circuit, one end of the first pressure-sensitive resistor, and one end of the second pressure-sensitive resistor are connected; the first output terminal of the pressure detection circuit, the other end of the second pressure-sensitive resistor, and one end of the fourth pressure-sensitive resistor are connected; the ground terminal of the pressure detection circuit, the other end of the fourth pressure-sensitive resistor, and one end of the third pressure-sensitive resistor are connected; and the second output terminal of the pressure detection circuit, the other end of the third pressure-sensitive resistor, and the other end of the first pressure-sensitive resistor are connected.

4. The charging dock circuit as described in claim 1, characterized in that, The fan drive circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a second capacitor, a third capacitor, a first switching transistor, and a first diode; Wherein, one end of the first capacitor and one end of the first resistor are connected to the first feedback signal input terminal of the main control circuit; the other end of the first resistor, one end of the second capacitor, and one end of the second resistor are connected to the first terminal of the first switching transistor; the other end of the first capacitor, the other end of the second capacitor, and the other end of the second resistor are grounded to one end of the third resistor; the controlled terminal of the first switching transistor and the other end of the third resistor are electrically connected to one end of the fourth resistor; the other end of the fourth resistor is connected to the first signal output terminal of the main control circuit; the second terminal of the first switching transistor, the anode of the first diode, and one end of the third capacitor are connected to the first terminal of the fan; the second terminal of the fan, the other end of the third capacitor, and the cathode of the first diode are connected to the power input terminal of the fan drive circuit.

5. The charging dock circuit as described in claim 4, characterized in that, The first switching transistor is an NMOS transistor, the gate of the NMOS transistor is the controlled terminal of the first switching transistor, the source of the NMOS transistor is the first terminal of the first switching transistor, and the drain of the NMOS transistor is the second terminal of the first switching transistor.

6. The charging dock circuit as described in claim 1, characterized in that, The wireless charging circuit includes an operational amplifier, a second switching transistor, a fifth resistor, a sixth resistor, a seventh resistor, a fourth capacitor, a fifth capacitor, and a first inductor. The controlled terminal of the second switching transistor is connected to the second signal output terminal of the main control circuit. The first terminal of the second switching transistor, one terminal of the fourth capacitor, and one terminal of the first inductor are connected to each other. The other terminal of the fourth capacitor and the other terminal of the first inductor are connected to the power input terminal of the wireless charging circuit. The second terminal of the second switching transistor and one terminal of the fifth resistor are connected to the first input terminal of the operational amplifier. The other terminal of the fifth resistor is grounded. The second input terminal of the operational amplifier, one terminal of the sixth resistor, and one terminal of the seventh resistor are connected to one terminal of the fifth capacitor. The other terminal of the sixth resistor is grounded. The other terminal of the seventh resistor, the other terminal of the fifth capacitor, and the output terminal of the operational amplifier are connected to the second feedback signal input terminal of the main control circuit.

7. The charging dock circuit as described in claim 6, characterized in that, The wireless charging circuit also includes an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, and a sixth capacitor; One end of the eighth resistor is connected to the second signal output terminal of the main control circuit. The other end of the eighth resistor and one end of the ninth resistor are connected to the controlled terminal of the second switching transistor. One end of the tenth resistor and the second terminal of the second switching transistor are connected to one end of the fifth resistor. The other end of the tenth resistor and one end of the sixth capacitor are connected to the first input terminal of the operational amplifier. The other end of the sixth capacitor is grounded. One end of the eleventh resistor is connected to the output terminal of the operational amplifier. The other end of the eleventh resistor is connected to the second feedback signal input terminal of the main control circuit.

8. The charging dock circuit as described in claim 1, characterized in that, Also includes: A voltage regulator circuit is provided, wherein the input terminal of the voltage regulator circuit is connected to the power supply input terminal, and the output terminal of the voltage regulator circuit is connected to the main control circuit. The voltage regulator circuit is used to regulate the power supply before outputting it.

9. The charging dock circuit as described in claim 8, characterized in that, The voltage regulator circuit includes a seventh capacitor, an eighth capacitor, a second inductor, a third inductor, and a voltage regulator chip; One end of the seventh capacitor and one end of the second inductor are connected to the first input terminal of the voltage regulator circuit. The other end of the seventh capacitor and one end of the third inductor are connected to the second input terminal of the voltage regulator circuit. The other end of the second inductor and one end of the eighth capacitor are connected to the input terminal of the voltage regulator chip. The other end of the third inductor and the other end of the eighth capacitor are grounded to the ground terminal of the voltage regulator chip. The output terminal of the voltage regulator chip is the output terminal of the voltage regulator circuit.

10. A charging stand, characterized in that, It includes a fan and a charging dock circuit as described in any one of claims 1 to 9; the fan is connected to the drive terminal of the fan drive circuit.

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