US 12,232,243 B2
Wireless power transmission apparatus for induction heating and control method thereof
Hyunwook Moon, Seoul (KR); Euisung Kim, Seoul (KR); and Yangkyeong Kim, Seoul (KR)
Assigned to LG Electronics Inc., Seoul (KR)
Filed by LG Electronics Inc., Seoul (KR)
Filed on Feb. 26, 2021, as Appl. No. 17/186,747.
Claims priority of application No. 10-2020-0024270 (KR), filed on Feb. 27, 2020.
Prior Publication US 2021/0274605 A1, Sep. 2, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. H05B 6/08 (2006.01); H02J 50/12 (2016.01); H02J 50/90 (2016.01); H02M 5/458 (2006.01)
CPC H05B 6/08 (2013.01) [H02J 50/12 (2016.02); H02J 50/90 (2016.02); H02M 5/4585 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A wireless power transmission apparatus for induction heating comprising:
a working coil that is configured to change operation based on selection of a mode of operation from among a plurality of operating modes, the plurality of operating modes including a wireless power transmission mode configured to wirelessly transmit power and a heating mode configured to heat one or more objects;
an inverter that is configured to output, to the working coil, current at an operation frequency;
a controller that is configured to:
calculate an eccentricity degree between the working coil and a reception coil of a target object, and
control, in the wireless power transmission mode, the operation frequency based on the calculated eccentricity degree in a preparation period prior to wireless power transmission to the target object;
an upper glass arranged to receive the target object; and
an input unit configured to receive the selection of the mode of operation,
wherein the controller operates in the preparation period prior to a normal wireless power transmission mode configured to perform the wireless power transmission to the target object, and
wherein the controller is configured to:
determine, in the preparation period, (i) whether the target object includes the reception coil and (ii) the eccentricity degree,
enter an eccentricity detection mode to control the operation frequency and determine (i) whether the target object includes a reception coil and (ii) the eccentricity degree,
read resonance current of the working coil, and
determine, in the eccentricity detection mode, (i) whether the target object includes the reception coil and (ii) the eccentricity degree.