Wireless charging module, control circuit, and electronic device

Patent metadata

Field	Value
Publication number	US-12537392-B2
Application number	US-202318356339-A
Country	US
Kind code	B2
Filing date	Jul 21, 2023
Priority date	Jul 29, 2022
Publication date	Jan 27, 2026
Grant date	Jan 27, 2026

Abstract

Example wireless charging methods and apparatus are described. In one example, a wireless charging module includes a control circuit, a charging coil, a tunable capacitor module, and a converter circuit. The converter circuit includes at least one of a rectifier circuit or an inverter circuit. The tunable capacitor module is connected in series between the charging coil and the converter circuit. The tunable capacitor module includes a plurality of capacitors and at least one controllable switch. The control circuit controls the at least one controllable switch to be turned on or off, to control an equivalent capacitance value of the tunable capacitor module. The equivalent capacitance value of the tunable capacitor module includes one of a first capacitance value or a second capacitance value.

First claim

The invention claimed is:

1 . A wireless charging module, wherein the wireless charging module is configured to receive an alternating magnetic field generated by a wireless power supply device, and the wireless charging module comprises a control circuit, a charging coil, a tunable capacitor module, and a rectifier circuit, wherein:
the tunable capacitor module is connected in series between the charging coil and the rectifier circuit; the tunable capacitor module comprises a plurality of capacitors and at least one controllable switch; the charging coil is configured to receive the alternating magnetic field generated by the wireless power supply device and output an alternating current; the rectifier circuit is configured to convert the alternating current into a direct current; the wireless charging module is configured such that:
when the wireless power supply device runs in a constant-frequency voltage-regulation mode, the control circuit is configured to control one or more of the at least one controllable switch to be turned off; or
when the wireless power supply device runs in a constant-voltage frequency-regulation mode, the control circuit is configured to control all the at least one controllable switch to be turned on; and
the control circuit is configured to:
control the at least one controllable switch to be turned on or off, to control an equivalent capacitance value of the tunable capacitor module, wherein the equivalent capacitance value of the tunable capacitor module comprises one of a first capacitance value or a second capacitance value; and
control, based on an induced voltage of the charging coil, the rectifier circuit to run in a half-bridge voltage-multiplying rectification mode or a full-bridge rectification mode.

2 . The wireless charging module according to claim 1 , wherein:
the tunable capacitor module comprises a first capacitor, at least one parallel capacitor, and the at least one controllable switch, the first capacitor is connected in series between the charging coil and the rectifier circuit, and the at least one parallel capacitor is connected in parallel to the first capacitor by using the at least one controllable switch, wherein the wireless charging module is configured such that:
when one or more of the at least one controllable switch are turned off, the equivalent capacitance value of the tunable capacitor module is equal to the first capacitance value; and
when the at least one controllable switch is all turned on, the equivalent capacitance value of the tunable capacitor module is equal to the second capacitance value.

3 . The wireless charging module according to claim 1 , wherein:
the tunable capacitor module comprises a first capacitor, at least one series capacitor, and the at least one controllable switch, the first capacitor and the at least one series capacitor are connected in series between the charging coil and the rectifier circuit, and the at least one controllable switch is separately connected in parallel to the at least one series capacitor, wherein the wireless charging module is configured such that:
when one or more of the at least one controllable switch are turned off, the equivalent capacitance value of the tunable capacitor module is equal to the first capacitance value; and
when the at least one controllable switch is all turned on, the equivalent capacitance value of the tunable capacitor module is equal to the second capacitance value.

4 . The wireless charging module according to claim 1 , wherein the rectifier circuit comprises a first half bridge and a second half bridge that are connected in parallel, and the control circuit is configured to:
when the induced voltage of the charging coil is less than or equal to a preset voltage:
control an upper bridge arm and a lower bridge arm of the first half bridge to be alternately turned on or off;
control an upper bridge arm of the second half bridge to be turned on and a lower bridge arm of the second half bridge to be turned off; or
control the upper bridge arm of the second half bridge to be turned off and the lower bridge arm of the second half bridge to be turned on, wherein the rectifier circuit runs in the half-bridge voltage-multiplying rectification mode; and
when the induced voltage of the charging coil is greater than the preset voltage:
control both the upper bridge arm of the first half bridge and the lower bridge arm of the second half bridge and both the lower bridge arm of the first half bridge and the upper bridge arm of the second half bridge to be alternately turned on or off, wherein the rectifier circuit runs in the full-bridge rectification mode.

5 . The wireless charging module according to claim 1 , wherein:
the control circuit is configured to control one or more of the at least one controllable switch of the tunable capacitor module to be turned off, wherein at a resonance frequency of the tunable capacitor module and the charging coil is equal to a preset frequency or a working frequency of the alternating magnetic field provided by the wireless power supply device; and the control circuit is configured to control all the at least one controllable switch to be turned on, wherein the resonance frequency of the tunable capacitor module and the charging coil is less than a minimum working frequency of the alternating magnetic field provided by the wireless power supply device.

6 . A control circuit for a wireless charging module, wherein the wireless charging module is configured to receive an alternating magnetic field provided by a wireless power supply device, the wireless charging module comprises the control circuit, a charging coil, a tunable capacitor module, and a rectifier circuit, the charging coil is configured to receive the alternating magnetic field, the tunable capacitor module is connected in series between the charging coil and the rectifier circuit, the tunable capacitor module comprises a plurality of capacitors and at least one controllable switch,
wherein the control circuit is configured to:
control the at least one controllable switch to be turned on or off, to control an equivalent capacitance value of the tunable capacitor module, wherein the equivalent capacitance value of the tunable capacitor module comprises one of a first capacitance value or a second capacitance value;
when the wireless power supply device runs in a constant-voltage frequency-regulation mode, control the equivalent capacitance value of the tunable capacitor module to be equal to the first capacitance value; or
when the wireless power supply device runs in a constant-frequency voltage-regulation mode, control the equivalent capacitance value of the tunable capacitor module to be equal to or less than the second capacitance value and greater than the first capacitance value; and
control, based on an induced voltage of the charging coil, the rectifier circuit to run in a half-bridge voltage-multiplying rectification mode or a full-bridge rectification mode.

7 . The control circuit according to claim 6 , wherein the control circuit is configured to:
when the induced voltage of the charging coil is less than or equal to a preset voltage, control the rectifier circuit to run in the half-bridge voltage-multiplying rectification mode; and when the induced voltage of the charging coil is greater than the preset voltage, control the rectifier circuit to work in the full-bridge rectification mode.

8 . The control circuit according to claim 6 , wherein the rectifier circuit comprises a first half bridge and a second half bridge that are connected in parallel, and the control circuit is configured to:
control an upper bridge arm and a lower bridge arm of the first

Assignees

• Huawei Digital Power Tech Co Ltd

Inventors

• Li Yuechao
• Wang Chao

Classifications

• H02J2207/20

  Charging or discharging characterised by the power electronics converter · CPC title

• H02M7/53803

  with automatic control of output voltage or current · CPC title

• H02M3/1582

  Buck-boost converters (H02M3/1584 takes precedence) · CPC title

• H02J50/12 Primary

  of the resonant type · CPC title

• H02M3/33584

  Bidirectional converters · CPC title