WIRELESS POWER TRANSMISSION APPARATUS CAPABLE OF MATCHING IMPEDANCE

WIPO Patent Application WO/2013/115419

A1

A wireless power transmission apparatus is provided. The wireless power transmission apparatus comprises: a wireless power transmission antenna for wirelessly transmitting power; a sensor unit for sensing voltages and current of the wireless power transmission antenna; a variable capacitor unit including a plurality of capacitors which are connected in series and in parallel to the wireless power transmission antenna, and a plurality of switches for switching the connection of the plurality of capacitors; and a control unit for calculating impedance using the voltages and current sensed through the sensor unit, and adjusting the capacitance of the variable capacitor unit according to the calculated impedance. Accordingly, the wireless power transmission apparatus can enhance wireless power efficiency by adjusting capacitance according to a change in impedance, which is due to a change in the distance from a receiver, and matching the impendence.

JP4785740	Electrical connector
JP2003143710	CHARGING CONNECTOR

LIM YONG SEOK (KR)
WON YUN JAE (KR)
MOON YUN KUK (KR)
YANG WOO JIN (KR)
LIM SEUNG OK (KR)

PCT/KR2012/000725

August 08, 2013

January 31, 2012

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KOREA ELECTRONICS TECHNOLOGY (KR)
LIM YONG SEOK (KR)
WON YUN JAE (KR)
MOON YUN KUK (KR)
YANG WOO JIN (KR)
LIM SEUNG OK (KR)

H02J17/00; H02J7/02; H04B5/02

WO2011061821A1

2011-05-26

KR20100130618A	2010-12-13
JP2009112137A	2009-05-21
JP2012010546A	2012-01-12
EP2357717A1	2011-08-17

NAM, Choong Woo et al. (KR)
남충우 (KR)

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