CN219801984U - Induction charging circuit of electric toothbrush - Google Patents
Induction charging circuit of electric toothbrush Download PDFInfo
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- CN219801984U CN219801984U CN202320574678.5U CN202320574678U CN219801984U CN 219801984 U CN219801984 U CN 219801984U CN 202320574678 U CN202320574678 U CN 202320574678U CN 219801984 U CN219801984 U CN 219801984U
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- 230000006698 induction Effects 0.000 title claims abstract description 19
- 238000004891 communication Methods 0.000 claims abstract description 29
- 238000001514 detection method Methods 0.000 claims abstract description 17
- 239000003990 capacitor Substances 0.000 claims description 118
- 230000001939 inductive effect Effects 0.000 claims description 12
- 230000002457 bidirectional effect Effects 0.000 claims description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 8
- 230000008878 coupling Effects 0.000 description 6
- 238000010168 coupling process Methods 0.000 description 6
- 238000005859 coupling reaction Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Abstract
The utility model discloses an electric toothbrush induction charging circuit, comprising: the QI charging circuit is characterized in that a communication end of the QI charging circuit is connected with a communication end of the main control circuit, and an output end of the QI charging circuit is mutually coupled with the electric toothbrush; the output end of the main control circuit is connected with one end of the switch circuit; the other end of the switching circuit is connected with one end of the first LC resonance circuit; the other end of the first LC resonance circuit is mutually coupled with the electric toothbrush; the input end of the detection circuit is connected with the switch circuit, and the output end of the detection circuit is connected with the input end of the main control circuit; the use efficiency and the user experience of the induction charging circuit of the electric toothbrush are improved, and the use cost of a user is reduced; meanwhile, the voltage value output by the switch circuit is obtained through the detection circuit and is output to the main control circuit, so that the main control circuit controls whether to output a sine wave signal or not according to the voltage value; the invalid charging action of the induction charging circuit of the electric toothbrush is avoided, and the service life of the electric toothbrush is prolonged.
Description
Technical Field
The utility model relates to the technical field of toothbrush charging, in particular to an induction charging circuit of an electric toothbrush.
Background
With the rapid development of technology, intelligent electronic devices are not separated from people's life, and how to more effectively charge the intelligent electronic devices is closely related.
In the prior art, the electric toothbrush is generally sold in a matched manner by a toothbrush and a charger, and when a user uses the electric toothbrush, the toothbrush is often damaged due to some reasons, and the user often needs to purchase the toothbrush independently; because the charging function of the rest charger is single, the electric toothbrush which cannot meet different charging protocols can not be charged, however, in order to match the rest charger to purchase the toothbrush, the optional purchase space is small, the rest charger is finally discarded and is not used any more, the user experience is seriously poor, and the use cost of the electric toothbrush is increased.
Meanwhile, the charger in the prior art often cannot detect whether an object close to the charger is a toothbrush or not, so that invalid charging is performed, and the service life of the charger is shortened.
Disclosure of Invention
In view of the foregoing, it is desirable to provide an electric toothbrush inductive charging circuit.
An electric toothbrush induction charging circuit comprising:
the QI charging circuit is characterized in that a communication end of the QI charging circuit is connected with a communication end of the main control circuit, and an output end of the QI charging circuit is mutually coupled with the electric toothbrush; the QI charging circuit is used for charging the electric toothbrush or outputting a communication signal to the main control circuit;
the output end of the main control circuit is connected with one end of the switch circuit and is used for receiving the communication signal and outputting a sine wave signal to the switch circuit;
the switching circuit is connected with one end of the first LC resonance circuit at the other end, and is used for receiving the sine wave signal and outputting a high-level signal or a low-level signal to the first LC resonance circuit;
the other end of the first LC resonance circuit is mutually coupled with the electric toothbrush so as to charge the electric toothbrush;
the input end of the detection circuit is connected with the switch circuit, and the output end of the detection circuit is connected with the input end of the main control circuit; the voltage value output by the switch circuit is detected, amplified and output to the main control circuit.
In one embodiment, the electric toothbrush induction charging circuit further comprises:
and the input end of the power supply protection circuit is connected with an external power supply, and the output end of the power supply protection circuit is connected with the QI charging circuit and the main control circuit and is used for supplying power to the QI charging circuit and the main control circuit.
In one embodiment, the QI charging circuit includes:
the wireless charging transmitting circuit is characterized in that a communication end of the wireless charging transmitting circuit is connected with a communication end of the main control circuit, and an output end of the wireless charging transmitting circuit is connected with one end of the second LC resonance circuit; the device is used for outputting a communication signal to the main control circuit or outputting a resonant frequency to the second LC resonant circuit;
the second LC resonance circuit is mutually coupled with the electric toothbrush at the other end and is used for receiving the resonance frequency and charging the electric toothbrush.
In one embodiment, the master circuit includes: the MCU chip, the first capacitor and the second capacitor;
one end of the first capacitor is connected with the output end of the power supply protection circuit and the power supply end of the MCU chip, and the other end of the first capacitor is grounded;
the second capacitor is connected in parallel with the first capacitor.
In one embodiment, the switching circuit includes: the MOS transistor, the first resistor, the second resistor and the third resistor;
one end of the first resistor is connected with the output end of the MCU chip, and the other end of the first resistor is connected with one end of the second resistor and the grid electrode of the MOS tube;
the other end of the second resistor is grounded;
the source electrode of the MOS tube is connected with one end of the third resistor, and the drain electrode of the MOS tube is connected with one end of the first LC resonance circuit;
the other end of the third resistor is grounded.
In one embodiment, the first LC resonant circuit includes: the third capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor and the first inductor;
one end of the first inductor is connected with the output end of the power supply protection circuit, and the other end of the first inductor is connected with the drain electrode of the MOS tube;
the third capacitor, the fourth capacitor, the fifth capacitor and the sixth capacitor are all connected with the first inductor in parallel.
In one embodiment, the detection circuit includes: an operational amplifier, a seventh capacitor, an eighth capacitor, a ninth capacitor, a fourth resistor, a fifth resistor, a sixth resistor and a seventh resistor;
one end of the fourth resistor is connected with the source electrode of the MOS tube, and the other end of the fourth resistor is connected with the non-inverting input end of the operational amplifier;
one end of the seventh capacitor is connected with the non-inverting input end of the operational amplifier, and the other end of the seventh capacitor is grounded;
one end of the eighth capacitor is connected with the output end of the power supply protection circuit and the positive side power supply pin of the operational amplifier, and the other end of the eighth capacitor is grounded;
one end of the sixth resistor is connected with the inverting input end of the operational amplifier, and the other end of the sixth resistor is grounded;
one end of the fifth resistor is connected with the output end of the operational amplifier, and the other end of the fifth resistor is connected with the inverting input end of the operational amplifier;
one end of the seventh resistor is connected with the output end of the operational amplifier, and the other end of the seventh resistor is connected with the input end of the MCU chip;
one end of the ninth capacitor is connected with the output end of the operational amplifier, and the other end of the ninth capacitor is grounded.
In one embodiment, the power supply protection circuit includes: a diode, a tenth capacitor, an eleventh capacitor, an eighth resistor, a ninth resistor, and a tenth resistor;
one end of the eighth resistor is connected with the mains supply, the other end of the eighth resistor is connected with the cathode of the diode, the anode of the diode is connected with one end of the ninth resistor, and the other end of the ninth resistor is grounded;
one end of the eleventh capacitor is connected with the anode of the diode, the other end of the eleventh capacitor is connected with one end of the tenth resistor, and the other end of the tenth resistor is grounded;
one end of the tenth capacitor is connected with the cathode of the diode, and the other end of the tenth capacitor is connected with the anode of the diode and grounded.
In one embodiment, the wireless charging transmission circuit includes: a wireless charging transmitting chip, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor and a sixteenth capacitor;
the clock line and the bidirectional data line of the wireless charging transmitting chip are connected with the communication end of the main control circuit; the transmitting end and the receiving end of the wireless charging transmitting chip are connected with the second LC resonance circuit;
the power supply input end of the wireless charging transmitting chip is connected with the power supply protection circuit;
one end of the thirteenth capacitor is connected with the power supply input end of the wireless charging transmitting chip, and the other end of the thirteenth capacitor is grounded;
the fourteenth, fifteenth and sixteenth capacitances are all connected in parallel with the thirteenth capacitance.
In one embodiment, the second LC resonant circuit includes: a second inductor, an eighteenth capacitor, a nineteenth capacitor, a twentieth capacitor, and a twenty-first capacitor;
one end of the second inductor is connected with the transmitting end of the wireless charging transmitting chip, and the other end of the second inductor is connected with one end of the eighteenth capacitor;
the other end of the eighteenth capacitor is connected with the receiving end of the wireless charging transmitting chip;
the nineteenth, twentieth, and twenty-first capacitances are all connected in parallel with the eighteenth capacitance.
The implementation of the embodiment of the utility model has the following beneficial effects:
coupling the power toothbrush through a QI charging circuit, charging the power toothbrush if coupling is successful, and outputting a communication signal to the main control circuit if coupling is unsuccessful, wherein the main control circuit outputs a sine wave signal to the switch circuit; the switch circuit outputs a high-level signal or a low-level signal to the first LC resonance circuit, so that the first LC resonance circuit and the electric toothbrush are mutually coupled to charge the electric toothbrush; the electric toothbrush induction charging circuit can meet the requirements of charging an electric toothbrush with a QI (quality of service) charging protocol and an electric toothbrush charged by common fixed frequency, so that the use efficiency and the user experience of the electric toothbrush induction charging circuit are improved, and the use cost of a user is reduced; meanwhile, the voltage value output by the switch circuit is obtained through the detection circuit and is output to the main control circuit, so that the main control circuit controls whether to output a sine wave signal or not according to the voltage value; the invalid charging action of the induction charging circuit of the electric toothbrush is avoided, and the service life of the electric toothbrush is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Wherein:
FIG. 1 is a block diagram of an embodiment of an inductive charging circuit for an electric toothbrush;
FIG. 2 is a block diagram of an alternative embodiment of an inductive charging circuit for an electric toothbrush;
FIG. 3 is a circuit diagram of a wireless charging transmit circuit in one embodiment;
FIG. 4 is a circuit diagram of a second LC resonant circuit in one embodiment;
FIG. 5 is a circuit diagram of a master circuit in one embodiment;
FIG. 6 is a circuit diagram of a switching circuit and a first LC resonant circuit in one embodiment;
FIG. 7 is a circuit diagram of detection circuitry in one embodiment;
fig. 8 is a circuit diagram of a power protection circuit in one embodiment.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
With the rapid development of technology, intelligent electronic devices are not separated from people's life, and how to more effectively charge the intelligent electronic devices is closely related.
In the prior art, the electric toothbrush is generally sold in a matched manner by a toothbrush and a charger, and when a user uses the electric toothbrush, the toothbrush is often damaged due to some reasons, and the user often needs to purchase the toothbrush independently; because the charging function of the rest charger is single, the electric toothbrush which cannot meet different charging protocols can not be charged, however, in order to match the rest charger to purchase the toothbrush, the optional purchase space is small, the rest charger is finally discarded and is not used any more, the user experience is seriously poor, and the use cost of the electric toothbrush is increased.
Meanwhile, the charger in the prior art often cannot detect whether an object close to the charger is a toothbrush or not, so that invalid charging is performed, and the service life of the charger is shortened.
In order to solve the above technical problem, as shown in fig. 1, an electric toothbrush induction charging circuit includes: QI charging circuit 50, master circuit 10, switching circuit 20, first LC resonance circuit 30, detection circuit 40, and power supply protection circuit 60; wherein, the liquid crystal display device comprises a liquid crystal display device,
the communication end of the QI charging circuit 50 is connected with the communication end of the main control circuit 10, and the output end is mutually coupled with the electric toothbrush; the QI charging circuit 50 is configured to charge the electric toothbrush or output a communication signal to the main control circuit 10;
the output end of the main control circuit 10 is connected with one end of the switch circuit 20, and is used for receiving the communication signal and outputting a sine wave signal to the switch circuit 20;
the other end of the switch circuit 20 is connected to one end of the first LC resonant circuit 30, and is configured to receive the sine wave signal and output a high level signal or a low level signal to the first LC resonant circuit 30;
the other end of the first LC resonant circuit 30 is coupled with the electric toothbrush to charge the electric toothbrush;
the input end of the detection circuit 40 is connected with the switch circuit 20, and the output end is connected with the input end of the main control circuit 10; the voltage value output by the switch circuit 20 is detected, amplified and output to the main control circuit 10;
the input end of the power supply protection circuit 60 is connected with an external power supply, and the output end is connected with the QI charging circuit 50 and the master control circuit 10, so as to supply power to the QI charging circuit 50 and the master control circuit 10. Coupling with the electric toothbrush through the QI charging circuit 50, if the coupling is successful, charging the electric toothbrush, and if the coupling is unsuccessful, outputting a communication signal to the main control circuit, and outputting a sine wave signal to the switch circuit by the main control circuit; the switch circuit outputs a high-level signal or a low-level signal to the first LC resonance circuit, so that the first LC resonance circuit and the electric toothbrush are mutually coupled to charge the electric toothbrush; the electric toothbrush induction charging circuit can meet the requirements of charging an electric toothbrush with a QI (quality of service) charging protocol and an electric toothbrush charged by common fixed frequency, so that the use efficiency and the user experience of the electric toothbrush induction charging circuit are improved, and the use cost of a user is reduced; meanwhile, the voltage value output by the switch circuit is obtained through the detection circuit and is output to the main control circuit, so that the main control circuit controls whether to output a sine wave signal or not according to the voltage value; the invalid charging action of the induction charging circuit of the electric toothbrush is avoided, and the service life of the electric toothbrush is prolonged.
In one embodiment, as shown in fig. 2, the QI charging circuit 50 includes: a wireless charging transmit circuit 501 and a second LC resonant circuit 502, wherein,
the communication end of the wireless charging transmitting circuit 501 is connected with the communication end of the main control circuit 10, and the output end is connected with one end of the second LC resonance circuit 502; for outputting a communication signal to the main control circuit 10 or outputting a resonance frequency to the second LC resonance circuit 502;
the other end of the second LC resonant circuit 502 is coupled to the electric toothbrush for receiving the resonant frequency and charging the electric toothbrush.
In one embodiment, as shown in fig. 5, the master circuit 10 includes: the MCU chip U2, the first capacitor C30 and the second capacitor C31;
one end of the first capacitor C30 is connected to the output end of the power supply protection circuit 60 and the power supply end VDD of the MCU chip U2, and the other end is grounded;
the second capacitor C31 is connected in parallel with the first capacitor C30.
In one embodiment, as shown in fig. 6, the switching circuit 20 includes: the MOS tube Q1, the first resistor R13, the second resistor R14 and the third resistor R16;
one end of the first resistor R13 is connected with the output end PA7 of the MCU chip U2, and the other end of the first resistor R14 is connected with one end of the second resistor R14 and the grid electrode of the MOS tube Q1;
the other end of the second resistor R14 is grounded;
the source electrode of the MOS tube Q1 is connected with one end of the third resistor R16, and the drain electrode of the MOS tube Q1 is connected with one end of the first LC resonance circuit 30;
the other end of the third resistor R16 is grounded.
In one embodiment, as shown in fig. 6, the first LC resonant circuit 30 includes: a third capacitor C22, a fourth capacitor C23, a fifth capacitor C24, a sixth capacitor C25 and a first inductance L3;
one end of the first inductor L3 is connected to the output end of the power supply protection circuit 60, and the other end is connected to the drain electrode of the MOS transistor Q1;
the third capacitor C22, the fourth capacitor C23, the fifth capacitor C24, and the sixth capacitor C25 are all connected in parallel with the first inductor L3.
In one embodiment, as shown in fig. 7, the detection circuit 40 includes: the operational amplifier U12, a seventh capacitor C27, an eighth capacitor C28, a ninth capacitor C29, a fourth resistor R22, a fifth resistor R21, a sixth resistor R23 and a seventh resistor R19;
one end of the fourth resistor R22 is connected with the source electrode of the MOS tube Q1, and the other end of the fourth resistor R is connected with the in+ input end of the operational amplifier U12;
one end of the seventh capacitor C27 is connected to the non-inverting input terminal in+ of the operational amplifier U12, and the other end is grounded;
one end of the eighth capacitor C28 is connected to the output end of the power supply protection circuit 60 and the positive side power supply pin v+ of the operational amplifier U12, and the other end is grounded;
one end of the sixth resistor R23 is connected with the inverting input end IN-of the operational amplifier U12, and the other end of the sixth resistor R is grounded;
one end of the fifth resistor R21 is connected with the output end of the operational amplifier U12, and the other end of the fifth resistor R is connected with the inverting input end IN-of the operational amplifier U12;
one end of the seventh resistor R19 is connected with the output end of the operational amplifier U12, and the other end of the seventh resistor R is connected with the input end PA4 of the MCU chip U2;
one end of the ninth capacitor C29 is connected to the output end of the operational amplifier U12, and the other end is grounded.
In one embodiment, as shown in fig. 8, the power supply protection circuit 60 includes: a diode D3, a tenth capacitor C2, an eleventh capacitor C3, an eighth resistor R3, a ninth resistor R4, and a tenth resistor R7;
one end of the eighth resistor R3 is connected with a mains supply, the other end of the eighth resistor R3 is connected with the cathode of the diode D3, the anode of the diode D3 is connected with one end of the ninth resistor R4, and the other end of the ninth resistor R4 is grounded;
one end of the eleventh capacitor C3 is connected to the anode of the diode D3, the other end of the eleventh capacitor C is connected to one end of the tenth resistor R7, and the other end of the tenth resistor R7 is grounded;
one end of the tenth capacitor C2 is connected to the cathode of the diode D3, and the other end is connected to the anode of the diode D3 and grounded.
In one embodiment, as shown in fig. 3, the wireless charging transmitting circuit 501 includes: a wireless charging transmitting chip U1, a thirteenth capacitor C9, a fourteenth capacitor C21, a fifteenth capacitor C10, and a sixteenth capacitor C11;
the clock line SCL and the bidirectional data line SDA of the wireless charging transmitting chip U1 are connected with the communication end of the master control circuit 10; the transmitting end SW1 and the receiving end SW2 of the wireless charging transmitting chip U1 are both connected with the second LC resonant circuit 502;
the power supply input end VIN of the wireless charging transmitting chip U1 is connected with the power supply protection circuit 60;
one end of the thirteenth capacitor C9 is connected with the power supply input end VIN of the wireless charging transmitting chip U1, and the other end of the thirteenth capacitor C is grounded;
the fourteenth capacitor C21, the fifteenth capacitor C10 and the sixteenth capacitor C11 are all connected in parallel with the thirteenth capacitor C9.
In one embodiment, as shown in fig. 4, the second LC resonant circuit 502 includes: a second inductance L1, an eighteenth capacitance C17, a nineteenth capacitance C18, a twentieth capacitance C19, and a twenty-first capacitance C20;
one end of the second inductor L1 is connected with the transmitting end SW1 of the wireless charging transmitting chip U1, and the other end is connected with one end of the eighteenth capacitor C17;
the other end of the eighteenth capacitor C17 is connected with the receiving end SW2 of the wireless charging transmitting chip U1;
the nineteenth capacitance C18, the twentieth capacitance C19, and the twenty first capacitance C20 are all connected in parallel with the eighteenth capacitance C17.
The working principle of the utility model is as follows:
after the wireless charging transmitting chip U1 is electrified, firstly performing hand covering action with a protocol in the electric toothbrush, namely detecting whether the charging protocol of the electric toothbrush is a QI charging protocol, and if so, charging the electric toothbrush through the wireless charging transmitting chip U1; if the charging protocol is not QI, the wireless charging transmitting chip U1 sends a communication signal to the MCU chip U2, so that the MCU chip U2 outputs a sine wave signal to the switch circuit, the switch circuit receives the sine wave signal and outputs a high level signal or a low level signal to the first LC resonant circuit, and at this time, the first inductor L3 in the first LC resonant circuit 30 is coupled with the electric toothbrush, so as to implement a wireless charging operation for the electric toothbrush. The detection circuit 40 acquires the voltage value output by the switch circuit 20 in real time, amplifies the voltage value and outputs the amplified voltage value to the MCU chip U2, the MCU chip U2 determines whether the object approaching is an electric toothbrush according to the voltage value (the judging method is not the scope of the present utility model, and is not specifically described), if yes, the MCU chip U2 continues to output a sine wave signal to the switch circuit; if not, the output of the sine wave signal to the switch circuit is stopped, and the charging operation is stopped. The electric toothbrush induction charging circuit can meet the requirements of charging an electric toothbrush with a QI (quality of service) charging protocol and an electric toothbrush charged by common fixed frequency, so that the use efficiency and the user experience of the electric toothbrush induction charging circuit are improved, and the use cost of a user is reduced; meanwhile, the voltage value output by the switch circuit is obtained through the detection circuit and is output to the main control circuit, so that the main control circuit controls whether to output a sine wave signal or not according to the voltage value; the invalid charging action of the induction charging circuit of the electric toothbrush is avoided, and the service life of the electric toothbrush is prolonged.
The foregoing disclosure is illustrative of the present utility model and is not to be construed as limiting the scope of the utility model, which is defined by the appended claims.
Claims (10)
1. An electric toothbrush induction charging circuit, comprising:
the QI charging circuit, the communication end connects with communication end of the main control circuit, the output end couples with said electric toothbrush each other; the QI charging circuit is used for charging the electric toothbrush or outputting a communication signal to the main control circuit;
the output end of the main control circuit is connected with one end of the switch circuit and is used for receiving the communication signal and outputting a sine wave signal to the switch circuit;
the switching circuit is connected with one end of the first LC resonance circuit at the other end, and is used for receiving the sine wave signal and outputting a high-level signal or a low-level signal to the first LC resonance circuit;
the other end of the first LC resonance circuit is mutually coupled with the electric toothbrush so as to charge the electric toothbrush;
the input end of the detection circuit is connected with the switch circuit, and the output end of the detection circuit is connected with the input end of the main control circuit; the voltage value output by the switch circuit is detected, amplified and output to the main control circuit.
2. The electric toothbrush inductive charging circuit of claim 1, further comprising:
and the input end of the power supply protection circuit is connected with an external power supply, and the output end of the power supply protection circuit is connected with the QI charging circuit and the main control circuit and is used for supplying power to the QI charging circuit and the main control circuit.
3. The electric toothbrush inductive charging circuit of claim 2, wherein said QI charging circuit comprises:
the wireless charging transmitting circuit is characterized in that a communication end of the wireless charging transmitting circuit is connected with a communication end of the main control circuit, and an output end of the wireless charging transmitting circuit is connected with one end of the second LC resonance circuit; the device is used for outputting a communication signal to the main control circuit or outputting a resonant frequency to the second LC resonant circuit;
the second LC resonance circuit is mutually coupled with the electric toothbrush at the other end and is used for receiving the resonance frequency and charging the electric toothbrush.
4. The electric toothbrush inductive charging circuit of claim 2, wherein the master control circuit comprises: the MCU chip, the first capacitor and the second capacitor;
one end of the first capacitor is connected with the output end of the power supply protection circuit and the power supply end of the MCU chip, and the other end of the first capacitor is grounded;
the second capacitor is connected in parallel with the first capacitor.
5. The electric toothbrush inductive charging circuit of claim 4, wherein said switching circuit comprises: the MOS transistor, the first resistor, the second resistor and the third resistor;
one end of the first resistor is connected with the output end of the MCU chip, and the other end of the first resistor is connected with one end of the second resistor and the grid electrode of the MOS tube;
the other end of the second resistor is grounded;
the source electrode of the MOS tube is connected with one end of the third resistor, and the drain electrode of the MOS tube is connected with one end of the first LC resonance circuit;
the other end of the third resistor is grounded.
6. The electric toothbrush inductive charging circuit of claim 5, wherein said first LC resonant circuit comprises: the third capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor and the first inductor;
one end of the first inductor is connected with the output end of the power supply protection circuit, and the other end of the first inductor is connected with the drain electrode of the MOS tube;
the third capacitor, the fourth capacitor, the fifth capacitor and the sixth capacitor are all connected with the first inductor in parallel.
7. The electric toothbrush inductive charging circuit of claim 6, wherein said detection circuit comprises: an operational amplifier, a seventh capacitor, an eighth capacitor, a ninth capacitor, a fourth resistor, a fifth resistor, a sixth resistor and a seventh resistor;
one end of the fourth resistor is connected with the source electrode of the MOS tube, and the other end of the fourth resistor is connected with the non-inverting input end of the operational amplifier;
one end of the seventh capacitor is connected with the non-inverting input end of the operational amplifier, and the other end of the seventh capacitor is grounded;
one end of the eighth capacitor is connected with the output end of the power supply protection circuit and the positive side power supply pin of the operational amplifier, and the other end of the eighth capacitor is grounded;
one end of the sixth resistor is connected with the inverting input end of the operational amplifier, and the other end of the sixth resistor is grounded;
one end of the fifth resistor is connected with the output end of the operational amplifier, and the other end of the fifth resistor is connected with the inverting input end of the operational amplifier;
one end of the seventh resistor is connected with the output end of the operational amplifier, and the other end of the seventh resistor is connected with the input end of the MCU chip;
one end of the ninth capacitor is connected with the output end of the operational amplifier, and the other end of the ninth capacitor is grounded.
8. The electric toothbrush inductive charging circuit of claim 7, wherein said power supply protection circuit comprises: a diode, a tenth capacitor, an eleventh capacitor, an eighth resistor, a ninth resistor, and a tenth resistor;
one end of the eighth resistor is connected with the mains supply, the other end of the eighth resistor is connected with the cathode of the diode, the anode of the diode is connected with one end of the ninth resistor, and the other end of the ninth resistor is grounded;
one end of the eleventh capacitor is connected with the anode of the diode, the other end of the eleventh capacitor is connected with one end of the tenth resistor, and the other end of the tenth resistor is grounded;
one end of the tenth capacitor is connected with the cathode of the diode, and the other end of the tenth capacitor is connected with the anode of the diode and grounded.
9. The electric toothbrush inductive charging circuit of claim 3, wherein said wireless charging transmit circuit comprises: a wireless charging transmitting chip, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor and a sixteenth capacitor;
the clock line and the bidirectional data line of the wireless charging transmitting chip are connected with the communication end of the main control circuit; the transmitting end and the receiving end of the wireless charging transmitting chip are connected with the second LC resonance circuit;
the power supply input end of the wireless charging transmitting chip is connected with the power supply protection circuit;
one end of the thirteenth capacitor is connected with the power supply input end of the wireless charging transmitting chip, and the other end of the thirteenth capacitor is grounded;
the fourteenth, fifteenth and sixteenth capacitances are all connected in parallel with the thirteenth capacitance.
10. The electric toothbrush inductive charging circuit of claim 9, wherein said second LC resonant circuit comprises: a second inductor, an eighteenth capacitor, a nineteenth capacitor, a twentieth capacitor, and a twenty-first capacitor;
one end of the second inductor is connected with the transmitting end of the wireless charging transmitting chip, and the other end of the second inductor is connected with one end of the eighteenth capacitor;
the other end of the eighteenth capacitor is connected with the receiving end of the wireless charging transmitting chip;
the nineteenth, twentieth, and twenty-first capacitances are all connected in parallel with the eighteenth capacitance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320574678.5U CN219801984U (en) | 2023-03-15 | 2023-03-15 | Induction charging circuit of electric toothbrush |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320574678.5U CN219801984U (en) | 2023-03-15 | 2023-03-15 | Induction charging circuit of electric toothbrush |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219801984U true CN219801984U (en) | 2023-10-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320574678.5U Active CN219801984U (en) | 2023-03-15 | 2023-03-15 | Induction charging circuit of electric toothbrush |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219801984U (en) |
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2023
- 2023-03-15 CN CN202320574678.5U patent/CN219801984U/en active Active
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