公开(公告)号：US10601252B2

公开(公告)日：2020-03-24

申请号：US15587676

申请日：2017-05-05

Applicant: RICHTEK TECHNOLOGY CORPORATION

Inventor： Kuo-Chi Liu ,  Wei-Hsin Wei ,  Chia-Hung Tsen

IPC: H02J50/12 ,  H02M1/00 ,  H02M1/38 ,  H02M3/337 ,  H03H7/38 ,  H02M7/521

Abstract: The present invention provides a resonant wireless power transmitter circuit, including: a load circuit, a power conversion circuit which is coupled between an input power supply and the load circuit, and a phase detection and control circuit. The power conversion circuit includes plural power switches and a current sensing device. The plural power switches operate with an operating frequency to convert the input power supply to an output power for driving the load circuit, wherein the load circuit has a load current. The load current has a load current phase difference from the switching frequency. The phase detection and control circuit detects a voltage difference between the current inflow terminal and the current outflow terminal of the current sensing device within a dead time in which the plural power switches are not conductive. The voltage difference corresponds to the load current phase difference.

公开(公告)号：US20180006496A1

公开(公告)日：2018-01-04

申请号：US15587676

申请日：2017-05-05

Applicant: RICHTEK TECHNOLOGY CORPORATION

Inventor： Kuo-Chi Liu ,  Wei-Hsin Wei ,  Chia-Hung Tsen

IPC: H02J50/12

Abstract: The present invention provides a resonant wireless power transmitter circuit, including: a load circuit, a power conversion circuit which is coupled between an input power supply and the load circuit, and a phase detection and control circuit. The power conversion circuit includes plural power switches and a current sensing device. The plural power switches operate with an operating frequency to convert the input power supply to an output power for driving the load circuit, wherein the load circuit has a load current. The load current has a load current phase difference from the switching frequency. The phase detection and control circuit detects a voltage difference between the current inflow terminal and the current outflow terminal of the current sensing device within a dead time in which the plural power switches are not conductive. The voltage difference corresponds to the load current phase difference.