公开(公告)号：US10727684B2

公开(公告)日：2020-07-28

申请号：US15698237

申请日：2017-09-07

Applicant: WITS Co. Ltd.

Inventor： Jung Ho Son ,  Keun Soo Ha ,  Yun Ki Hong ,  Seung Won Park ,  Eun Young Shin ,  Dae Sik Kim

IPC: H02J7/00 ,  H02J7/02 ,  H02J50/12 ,  H02J50/80 ,  H04B5/00

Abstract: A wireless power transmitter includes a converter, a resonator, and a controller. The converter includes switching elements forming a bridge circuit, and is configured to output an alternating current (AC) voltage in response to control signals. The resonator includes a resonant capacitor and a resonant coil, and is configured to receive the AC voltage to wirelessly transmit power. The controller is configured to perform a first mode operation in which a duty of the control signals is fixed, a frequency of one of the control signals is varied and the control signals are output, and a second mode operation in which a frequency of the control signals is fixed, a duty of one of the control signals is reduced and the control signals are output.

公开(公告)号：US10790675B2

公开(公告)日：2020-09-29

申请号：US16011916

申请日：2018-06-19

Applicant: WITS Co., Ltd.

Inventor： Sang Ho Cho ,  Chang Ik Kim ,  Seung Won Park ,  Yong Woon Park ,  Sang Beom Lee ,  Eun Young Shin ,  Jae Suk Sung ,  Jae Hyoung Cho

IPC: H02J5/00 ,  H02J50/10 ,  H02J7/02 ,  H02J7/00

Abstract: There are provided an apparatus for transmitting power wirelessly. The apparatus for transmitting power wirelessly may include a boosting unit boosting an input voltage, and an inverter unit inverting the boosted voltage output from the boosting unit to transmit power wirelessly. The inverter unit and the boosting unit are controlled by the same switching element.

公开(公告)号：US10483803B2

公开(公告)日：2019-11-19

申请号：US15471287

申请日：2017-03-28

Applicant: WITS Co., Ltd.

Inventor： Sang Ho Cho ,  Seung Won Park ,  Eun Young Shin ,  Hyo Young Kim ,  Young Seung Roh

IPC: H02J50/12 ,  H02J7/02 ,  H02M7/5387 ,  H02M7/48

Abstract: A wireless power transmitter includes: a converter including switching elements forming a bridge circuit, wherein the converter is configured to output an alternating current (AC) voltage including a frequency determined according to an operating frequency of at least one switching element among the switching elements; a resonator including an inductor and a capacitor, and configured to receive the AC voltage to wirelessly transmit power; and a controller configured to output control signals controlling the switching elements so that the converter performs a first mode operation in which an operating duty cycle is fixed and the operating frequency is varied, and an operation of the converter is switched from the first mode operation to a second mode operation in which the operating frequency is fixed and the operating duty cycle is varied, in response to the operating frequency reaching a first reference frequency.

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：US10965169B2

公开(公告)日：2021-03-30

申请号：US16011883

申请日：2018-06-19

Applicant: WITS Co., Ltd.

Inventor： Seung Won Park ,  Eun Young Shin ,  Byoung Woo Ryu ,  Hyo Young Kim ,  Yun Ki Hong ,  Young Seung Roh

IPC: H01F27/42 ,  H01F37/00 ,  H01F38/00 ,  H02J50/40 ,  H02J50/12 ,  H02J5/00 ,  H02J50/70 ,  H02J7/02

Abstract: A wireless power transmitter includes: a power supply configured to supply a driving power; a first power transmitter including first bridge switching elements forming a first bridge circuit, and configured to receive the driving power to transmit a first power, wherein a magnitude of a first input voltage applied to the first bridge circuit is determined by a duty of at least one of the first bridge switching elements; a second power transmitter including second bridge switching elements forming a second bridge circuit, and configured to receive the driving power to transmit a second power, wherein a magnitude of a second input voltage applied to the second bridge circuit is determined by a duty of at least one of the second bridge switching elements; and a controller configured to output first and second power transmitting control signals respectively controlling the first bridge switching elements and the second bridge switching elements.

公开(公告)号：US10944291B2

公开(公告)日：2021-03-09

申请号：US15692638

申请日：2017-08-31

Applicant: WITS Co., Ltd.

Inventor： Yun Ki Hong ,  Joung Ho Son ,  Keun Soo Ha ,  Dae Sik Kim ,  Eun Young Shin ,  Seung Won Park

IPC: H02J50/12 ,  H02J7/02 ,  H02J50/80 ,  H02J50/40 ,  H04B5/00

Abstract: A wireless power transmitter includes a converter comprising at least one switching element, and configured to generate boosted input power; a resonator and a controller. The resonator is configured to receive the boosted input power as an alternating current (AC) power, and transmit a ping signal in a detection mode for determining whether any one or both of an external object approaching and a type of the external object. The controller is configured to control the switching element, and gradually increase a duty cycle of a gate signal provided to the switching element, in the detection mode.