US 11,870,293 B2
Wireless charging receiver circuit, control method, and terminal device
Changsheng Pei, Dongguan (CN)
Assigned to HUAWEI TECHNOLOGIES CO., LTD., Guangdong (CN)
Filed by HUAWEI TECHNOLOGIES CO., LTD., Guangdong (CN)
Filed on Mar. 26, 2021, as Appl. No. 17/213,591.
Application 17/213,591 is a continuation of application No. PCT/CN2019/090428, filed on Jun. 6, 2019.
Claims priority of application No. 201811161343.0 (CN), filed on Sep. 30, 2018.
Prior Publication US 2021/0218264 A1, Jul. 15, 2021
Int. Cl. H02J 7/02 (2016.01); H02J 50/12 (2016.01); H04M 1/725 (2021.01)
CPC H02J 7/02 (2013.01) [H02J 50/12 (2016.02); H02J 2207/20 (2020.01); H04M 1/725 (2013.01)] 20 Claims
OG exemplary drawing
 
1. 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;
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; and
the controller is configured to:
obtain 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 a total value of capacitance values of capacitors that are in the N capacitor-switch networks and that are connected to the wireless charging receiver circuit are less than a preset capacitance threshold, adjust 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 total value of 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, adjust 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 decrease a total value of 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.