US 11,770,025 B2
Wireless power transmission appratus and control method thereof
Qing Jiang, Shanghai (CN); Yongkai Liao, Shanghai (CN); Min Xu, Shanghai (CN); and Shunyang Ji, Shanghai (CN)
Assigned to Delta Electronics (Shanghai) Co., Ltd., Shanghai (CN)
Filed by Delta Electronics (Shanghai) Co., Ltd., Shanghai (CN)
Filed on Jul. 5, 2021, as Appl. No. 17/367,428.
Claims priority of application No. 202010967911.7 (CN), filed on Sep. 15, 2020.
Prior Publication US 2022/0085649 A1, Mar. 17, 2022
Int. Cl. H02J 50/12 (2016.01)
CPC H02J 50/12 (2016.02) 13 Claims
OG exemplary drawing
 
1. A wireless power transmission apparatus, comprising:
a transmitting unit, comprising an inverter circuit, a first compensation circuit and a transmitting coil, the first compensation circuit being coupled between the inverter circuit and the transmitting coil;
a receiving unit, comprising a receiving coil, a second compensation circuit and a rectifier circuit, the second compensation circuit being coupled between the receiving coil and the rectifier circuit;
a power regulation circuit, configured to regulate an output signal of the wireless power transmission apparatus; and
a control unit, coupled to the inverter circuit and the power regulation circuit respectively, and configured to: acquire a voltage-and-current phase difference of the transmitting unit, a detection signal, and a power detection value of the wireless power transmission apparatus; control an operating frequency of the inverter circuit according to the voltage-and-current phase difference and a preset phase difference in such a manner that the voltage-and-current phase difference is equal to the preset phase difference, and generate a power derating signal according to the detection signal, and control, according to the power derating signal, the power detection value and a power reference signal, the power regulation circuit to regulate the output signal;
wherein the first compensation circuit, the transmitting coil, the receiving coil and the second compensation circuit form a resonant network, and parameters of an inductance component and a capacitance component in the resonant network are adjusted, so that the resonant network has three resonant frequency points which are a first resonant frequency point, a second resonant frequency point and a third resonant frequency point, wherein the second resonant frequency is higher than the first resonant frequency, the first resonant frequency is higher than the third resonant frequency point; and
the operating frequency is higher than the second resonant frequency; or, the operating frequency is equal to the second resonant frequency; or, the operating frequency is lower than the second resonant frequency and higher than the first resonant frequency.