公开(公告)号：US20180375380A1

公开(公告)日：2018-12-27

申请号：US15984291

申请日：2018-05-18

Applicant: RICHTEK TECHNOLOGY CORPORATION

Inventor： Kuo-Chi Liu ,  Ke-Horng Chen

IPC: H02J50/12 ,  H02M7/5387 ,  H02M1/088

CPC classification number: H02J50/12 ,  H02M1/088 ,  H02M7/5387 ,  H02M2001/0048

Abstract: A wireless power transmitter circuit includes a power converter circuit, a power inverter circuit, an LC circuit, a resonant transmitter circuit, and a control circuit. The LC circuit includes an inductor and a capacitor, wherein an reactance of the LC circuit is substantially zero. The LC circuit is for converting the AC output current to a coil current. The resonant transmitter circuit includes at least one transmitter coil and a variable capacitor circuit, wherein the coil current flows through the at least one transmitter coil to generate a resonant wireless power. The control circuit generates a capacitance adjustment signal for adjusting an impedance of the variable capacitor circuit, such that the resonant transmitter circuit substantially operates in an impedance matched condition.

公开(公告)号：US10742072B2

公开(公告)日：2020-08-11

申请号：US15984291

申请日：2018-05-18

Applicant: RICHTEK TECHNOLOGY CORPORATION

Inventor： Kuo-Chi Liu ,  Ke-Horng Chen

IPC: H02J50/12 ,  H02M1/088 ,  H02M7/5387 ,  H02M1/00

Abstract: A wireless power transmitter circuit includes a power converter circuit, a power inverter circuit, an LC circuit, a resonant transmitter circuit, and a control circuit. The LC circuit includes an inductor and a capacitor, wherein an reactance of the LC circuit is substantially zero. The LC circuit is for converting the AC output current to a coil current. The resonant transmitter circuit includes at least one transmitter coil and a variable capacitor circuit, wherein the coil current flows through the at least one transmitter coil to generate a resonant wireless power. The control circuit generates a capacitance adjustment signal for adjusting an impedance of the variable capacitor circuit, such that the resonant transmitter circuit substantially operates in an impedance matched condition.