US 11,901,760 B2
Receive end and transmit end of wireless charging system, method, electrical terminal, and system
Yunhe Mao, Shenzhen (CN); and Yanding Liu, Dongguan (CN)
Assigned to Huawei Technologies Co., Ltd., Shenzhen (CN)
Filed by HUAWEI TECHNOLOGIES CO., LTD., Guangdong (CN)
Filed on Apr. 9, 2021, as Appl. No. 17/226,860.
Application 17/226,860 is a continuation of application No. PCT/CN2019/110545, filed on Oct. 11, 2019.
Claims priority of application No. 201811488672.6 (CN), filed on Dec. 6, 2018.
Prior Publication US 2021/0226473 A1, Jul. 22, 2021
Int. Cl. H02J 7/02 (2016.01); H02J 50/12 (2016.01); H02M 1/00 (2006.01); H02M 7/219 (2006.01)
CPC H02J 7/02 (2013.01) [H02J 50/12 (2016.02); H02M 1/0058 (2021.05); H02M 7/219 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A receive end of a wireless charging system, the receive end comprising a receive coil, a receive end compensation circuit, a rectifier, and a controller, wherein:
the receive coil is configured to receive an alternating magnetic field and output an alternating current;
the receive end compensation circuit is connected between the receive coil and the rectifier, wherein the receive end compensation circuit is configured to:
compensate the alternating current that is output by the receive coil; and
output a compensated alternating current to the rectifier;
the receive end compensation circuit and the receive coil form a receive end compensation network, wherein the receive end compensation network comprises a first branch, a second branch, and a third branch, wherein the first branch comprises the receive coil, wherein both the first branch and the second branch are inductive branches, wherein a reactance of the second branch is greater than that of the first branch, wherein the first branch is connected to a first input end of the rectifier through the second branch, wherein the third branch is a capacitive branch, wherein a first end of the third branch is connected to a common end of the first branch and the second branch, and wherein a second end of the third branch is connected to a second input end of the rectifier;
the rectifier comprises controllable switching transistors, wherein the rectifier is configured to rectify the alternating current to a direct current; and
the controller is configured to:
adjust a phase difference between a first bridge arm and a second bridge arm of the rectifier; and
adjust a phase-shift angle between a bridge arm voltage of the rectifier and a fundamental component of an input current of the rectifier, wherein zero-voltage switching is implemented for the controllable switching transistors of the rectifier.