公开(公告)号：US10418857B2

公开(公告)日：2019-09-17

申请号：US15790815

申请日：2017-10-23

Applicant: WITS Co., Ltd.

Inventor： Hyo Young Kim ,  Seung Won Park ,  Eun Young Shin ,  Byoung Woo Ryu ,  Dong Woo Han ,  Ye Ji Park ,  Young Seung Roh

IPC: H02J50/12 ,  H02M7/539 ,  H02M1/14 ,  H02M1/36 ,  H02M3/155 ,  H02M7/48 ,  H02J50/80 ,  H02J7/02 ,  H02M1/00

Abstract: A wireless power transmitter includes: a converter including switching elements forming a bridge circuit and configured to output an alternating current (AC) voltage in response to control signals; a resonator including a resonant capacitor and a resonant coil, and configured to receive the AC voltage to transmit power wirelessly; and a controller configured to set a dead time at which a magnitude of the AC voltage is substantially zero in response to a signal received from a wireless power receiver.

公开(公告)号：US10749381B2

公开(公告)日：2020-08-18

申请号：US15801871

申请日：2017-11-02

Applicant: WITS Co., Ltd.

Inventor： Dong Woo Han ,  Byoung Woo Ryu ,  Hyo Young Kim ,  Se Joo Kim ,  Young Seung Roh

IPC: H02J50/12 ,  H02M7/48 ,  H02M1/00 ,  H02J7/02

Abstract: A wireless power transmission device including a resonant circuit magnetically coupled to a wireless power reception device and being configured to wirelessly transmit power, an alternating current (AC) generator including switches and being configured to receive a direct current (DC) voltage and to generate an AC current, according to a switching operation of the switches, to be supplied to the resonant circuit, and a variable capacitor connected to an output terminal of the AC generator and having a first capacitance, when a load state of the wireless power reception device is provided as a full load state and a second capacitance lower than the first capacitance, when the load state is provided as a light load state.