CN-224204826-U - Wireless charging circuit, charging seat and induction charging system

CN224204826UCN 224204826 UCN224204826 UCN 224204826UCN-224204826-U

Abstract

The utility model discloses a wireless charging circuit, a charging seat and an induction charging system, and relates to the technical field of wireless charging. The charging seat comprises an alternating current input end, the wireless charging circuit comprises a protection circuit, a rectification circuit, a double-ring mutual inductance resonant circuit and a double-ring mutual inductance resonant circuit, wherein the first end of the protection circuit is electrically connected with the alternating current input end, the protection circuit is used for limiting input voltage and input current of the alternating current input end to be within preset voltage and preset current ranges respectively and outputting the input voltage and the input current, the first end of the rectification circuit is electrically connected with the second end of the protection circuit, the rectification circuit is used for converting alternating current output by the protection circuit into direct current and outputting the direct current, the input end of the double-ring mutual inductance resonant circuit is electrically connected with the second end of the rectification circuit, and the double-ring mutual inductance resonant circuit is used for generating a corresponding changing magnetic field when receiving the changing direct current. The utility model aims to improve the wireless charging efficiency and stability of equipment to be charged.

Inventors

CHEN CHUGANG
LUO ZHIXIANG
LI DONGBAO
ZHENG CHUANZHOU

Assignees

瑞圣特科技(深圳)有限公司

Dates

Publication Date: 20260505
Application Date: 20250520

Claims (9)

1. A wireless charging circuit for a charging stand, the charging stand comprising an ac input, the wireless charging circuit comprising: the protection circuit is used for limiting the input voltage and the input current of the alternating current input end within the preset voltage and the preset current range respectively and outputting the input voltage and the input current; The protection circuit comprises a protection circuit, a rectifying circuit, a first voltage regulator and a second voltage regulator, wherein the protection circuit is used for protecting the battery, and the first end of the protection circuit is electrically connected with the second end of the protection circuit; The input end of the double-loop mutual inductance resonant circuit is electrically connected with the second end of the rectifying circuit; the double-loop mutual inductance resonant circuit is used for generating a corresponding changing magnetic field when receiving the changing direct current.
2. The wireless charging circuit of claim 1, wherein the protection circuit comprises a first resistor, a fuse, a thermistor, and an adjustable resistor; The first end of the first resistor is electrically connected with the first end of the alternating current input end, the second end of the first resistor is electrically connected with the first end of the fuse, the second end of the fuse is electrically connected with the first end of the adjustable resistor and the first end of the rectifying circuit, the second end of the adjustable resistor is electrically connected with the input end of the rectifying circuit and the second end of the thermistor, and the first end of the thermistor is electrically connected with the second end of the alternating current input end.
3. The wireless charging circuit of claim 1, wherein the rectifying circuit comprises: The half-wave rectification circuit is used for converting input alternating current into corresponding direct current and outputting the corresponding direct current; The input end of the filter circuit is electrically connected with the output end of the half-wave rectifying circuit, the output end of the filter circuit is electrically connected with the input end of the double-loop mutual inductance resonant circuit, and the filter circuit is used for filtering and outputting the input direct current.
4. The wireless charging circuit of claim 3, wherein the half-wave rectification circuit comprises a first diode and a second diode; The anode of the first diode is electrically connected with the protection circuit, the cathode of the first diode is electrically connected with the double-loop mutual inductance resonant circuit and the first end of the first capacitor, the anode of the second diode is electrically connected with the double-loop mutual inductance resonant circuit and the second end of the first capacitor, and the cathode of the second diode is electrically connected with the protection circuit.
5. The wireless charging circuit of claim 1, wherein the dual-turn mutual inductance resonant circuit comprises: The input end of the first mutual inductance resonant circuit is electrically connected with the output end of the rectifying circuit; the first mutual inductance resonant circuit is used for generating a corresponding changing magnetic field when receiving the changing direct current; The input end of the second mutual inductance resonant circuit is electrically connected with the first mutual inductance resonant circuit, and the second mutual inductance resonant circuit is used for generating a corresponding changing magnetic field when receiving the corresponding changing magnetic field generated by the first mutual inductance resonant circuit.
6. The wireless charging circuit of claim 5, wherein the first mutual inductance resonant circuit comprises a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first zener diode, a third diode, a first switching tube, a first inductor; The first end of the second resistor is electrically connected with the rectifying circuit, the first end of the second capacitor, the first end of the first inductance coil and the first end of the fourth capacitor, the second end of the second resistor is electrically connected with the first end of the third resistor, the second end of the third resistor is electrically connected with the second end of the second capacitor, the controlled end of the first switch tube, the first end of the fourth resistor and the second mutual inductance resonance circuit, the second end of the fourth resistor is electrically connected with the rectifying circuit, the anode of the first voltage stabilizing diode, the sixth resistor, the second mutual inductance resonance circuit and the ground, the second end of the first inductor is electrically connected with the first end of the first switch tube and the first end of the fifth resistor, the second end of the fifth resistor is electrically connected with the first end of the third capacitor, the second end of the third resistor is electrically connected with the second end of the fourth capacitor, the anode of the third diode and the cathode of the third switch tube.
7. The wireless charging circuit of claim 5, wherein the second mutual inductance resonant circuit comprises a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fifth capacitor, a sixth capacitor, a seventh capacitor, a fourth diode, a fifth diode, a second zener diode, a third zener diode, a second switching tube, a second inductor; The first end of the seventh resistor is electrically connected with the first end of the eighth resistor, the first end of the eleventh resistor and the first mutual inductance resonant circuit, the second end of the seventh resistor is electrically connected with the first end of the second switch tube, the second end of the eighth resistor and the first end of the fifth capacitor, the second end of the fifth capacitor is electrically connected with the first end of the ninth resistor, the second end of the ninth resistor is electrically connected with the controlled end of the second switch tube, the first end of the tenth resistor and the anode of the third voltage stabilizing diode, the cathode of the third voltage stabilizing diode is electrically connected with the anode of the second voltage stabilizing diode, the cathode of the second voltage stabilizing diode is electrically connected with the first end of the sixth capacitor and the second end of the thirteenth resistor, the second end of the fifth switch tube is electrically connected with the first mutual inductance circuit, the second end of the tenth resistor, the first end of the sixth capacitor, the anode of the fourth coil is electrically connected with the cathode of the fifth resistor, the cathode of the fifth diode is electrically connected with the cathode of the fourth resistor, the cathode of the thirteenth resistor is electrically connected with the fourth end of the fourth resistor.
8. A cradle comprising an ac input and a wireless charging circuit as claimed in any one of claims 1 to 7.
9. An inductive charging system, characterized in that it comprises a device to be charged and a charging stand according to claim 8.

Description

Wireless charging circuit, charging seat and induction charging system Technical Field The present utility model relates to wireless charging technologies, and in particular, to a wireless charging circuit, a charging stand, and an inductive charging system. Background In the prior art, the electric toothbrush is charged in a wired manner, but the electric toothbrush needs to be contacted with liquid frequently due to the fact that a corresponding connecting interface is required to be arranged in the wired manner. Therefore, in the electric toothbrush, a wired charging mode is adopted, so that the problem of circuit damage is easily caused. In addition, the wireless charging mode of the existing electric toothbrush has the problems of unstable charging and low charging efficiency. Disclosure of utility model The utility model mainly aims to provide a wireless charging circuit, a charging seat and an induction charging system, which aim to improve the wireless charging efficiency and stability of equipment to be charged. In order to achieve the above object, the present utility model provides a wireless charging circuit applied to a charging stand, the charging stand includes an ac input terminal, the wireless charging circuit includes: the protection circuit is used for limiting the input voltage and the input current of the alternating current input end within the preset voltage and the preset current range respectively and outputting the input voltage and the input current; The protection circuit comprises a protection circuit, a rectifying circuit, a first voltage regulator and a second voltage regulator, wherein the protection circuit is used for protecting the battery, and the first end of the protection circuit is electrically connected with the second end of the protection circuit; The input end of the double-loop mutual inductance resonant circuit is electrically connected with the second end of the rectifying circuit; the double-loop mutual inductance resonant circuit is used for generating a corresponding changing magnetic field when receiving the changing direct current. In one embodiment, the protection circuit comprises a first resistor, a fuse, a thermistor and an adjustable resistor; The first end of the first resistor is electrically connected with the first end of the alternating current input end, the second end of the first resistor is electrically connected with the first end of the fuse, the second end of the fuse is electrically connected with the first end of the adjustable resistor and the first end of the rectifying circuit, the second end of the adjustable resistor is electrically connected with the input end of the rectifying circuit and the second end of the thermistor, and the first end of the thermistor is electrically connected with the second end of the alternating current input end. In one embodiment, the rectifying circuit includes: The half-wave rectification circuit is used for converting input alternating current into corresponding direct current and outputting the corresponding direct current; The input end of the filter circuit is electrically connected with the output end of the half-wave rectifying circuit, the output end of the filter circuit is electrically connected with the input end of the double-loop mutual inductance resonant circuit, and the filter circuit is used for filtering and outputting the input direct current. In one embodiment, the half-wave rectification circuit comprises a first diode and a second diode; The anode of the first diode is electrically connected with the protection circuit, the cathode of the first diode is electrically connected with the double-loop mutual inductance resonant circuit and the first end of the first capacitor, the anode of the second diode is electrically connected with the double-loop mutual inductance resonant circuit and the second end of the first capacitor, and the cathode of the second diode is electrically connected with the protection circuit. In one embodiment, the dual-turn mutual inductance resonant circuit includes: The input end of the first mutual inductance resonant circuit is electrically connected with the output end of the rectifying circuit; the first mutual inductance resonant circuit is used for generating a corresponding changing magnetic field when receiving the changing direct current; The input end of the second mutual inductance resonant circuit is electrically connected with the first mutual inductance resonant circuit, and the second mutual inductance resonant circuit is used for generating a corresponding changing magnetic field when receiving the corresponding changing magnetic field generated by the first mutual inductance resonant circuit. In an embodiment, the first mutual inductance resonant circuit includes a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first ze