Title:
FOREIGN OBJECT DETECTING METHOD FOR WIRELESS CHARGING AND DEVICE THEREFOR
Document Type and Number:
WIPO Patent Application WO/2019/031748
Kind Code:
A1
Abstract:
The present invention relates to a foreign object detecting method, and a device and system therefor. A method for detecting a foreign object in a wireless power transmitter according to an embodiment of the present invention may comprise the steps of: when an object placed in a charging area is sensed, measuring quality factor values within an operating frequency band to find a measured peak frequency at which the maximum quality factor value is measured; storing the measured peak frequency and the measured quality factor value corresponding to the measured peak frequency; transmitting information on the type of transmitter to an identified wireless power receiver; receiving a reference quality factor value and a reference peak frequency corresponding to the type of transmitter; calculating a measured inductance by using the measured peak frequency; calculating a reference inductance by using the reference peak frequency; and detecting a foreign object by using at least one of the reference quality factor value, the reference peak frequency, and the reference inductance.
Inventors:
PARK JAE HEE (KR)
KWON YONG IL (KR)
KWON YONG IL (KR)
Application Number:
PCT/KR2018/008625
Publication Date:
February 14, 2019
Filing Date:
July 30, 2018
Export Citation:
Assignee:
LG INNOTEK CO LTD (KR)
International Classes:
H02J50/60; G01R23/02; G01R27/26; H02J50/80
Domestic Patent References:
| WO2012002063A1 | 2012-01-05 |
Foreign References:
| KR20150059069A | 2015-05-29 | |||
| KR20160022823A | 2016-03-02 | |||
| JP2014220944A | 2014-11-20 | |||
| US20140084857A1 | 2014-03-27 |
Attorney, Agent or Firm:
LEE, Seung Chan (KR)
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