Patent ID: 11870293
Assignee: HUAWEI TECHNOLOGIES CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 9:
10. A control method comprising:
providing a wireless charging receiver circuit comprising:
N capacitor-switch networks;
a rectifier circuit; and
a controller, wherein
N is an integer greater than or equal to 1, and a first end of each capacitor-switch network is connected to a first input end of the rectifier circuit, and a second end of each capacitor-switch network is connected to a second input end of the rectifier circuit;
each capacitor-switch network comprises a first capacitor, a second capacitor, a first controllable switch device, a second controllable switch device, and a ground point, wherein the first capacitor located on one side of the ground point is connected in series to the first controllable switch device, and the second capacitor located on the other side of the ground point is connected in series to the second controllable switch device; and in a same capacitor-switch network, a capacitance value of the first capacitor is equal to a capacitance value of the second capacitor; and
the controller comprises N output ends, wherein the N output ends one-to-one correspond to the N capacitor-switch networks, and each output end is configured to be connected to a control end of the first controllable switch device in a corresponding capacitor-switch network and a control end of the second controllable switch device in the corresponding capacitor-switch network;

obtaining an operating frequency of an alternating-current voltage between the first input end and the second input end of the rectifier circuit; and
when the operating frequency is less than a first frequency threshold, and capacitance values of capacitors that are in N capacitor-switch networks and that are connected to the wireless charging receiver circuit are less than a preset capacitance threshold, adjusting an output level at each output end, to control the first controllable switch device and the second controllable switch device in each capacitor-switch network to be closed or opened, to increase the capacitance values of the capacitors that are in the N capacitor-switch networks and that are connected to the wireless charging receiver circuit; or
when the operating frequency is greater than a second frequency threshold, adjusting the output level at each output end, to control the first controllable switch device and the second controllable switch device in each capacitor-switch network to be closed or opened, to decrease capacitance values of capacitors that are in the N capacitor-switch networks and that are connected to the wireless charging receiver circuit, wherein the first frequency threshold is less than or equal to the second frequency threshold.