US 12,302,479 B2
Wireless power transmission apparatus for induction heating and control method thereof
Jaewoo Lee, Seoul (KR); Euisung Kim, Seoul (KR); and Hojae Seong, Seoul (KR)
Assigned to LG Electronics Inc., Seoul (KR)
Filed by LG Electronics Inc., Seoul (KR)
Filed on Feb. 25, 2021, as Appl. No. 17/185,626.
Claims priority of application No. 10-2020-0024269 (KR), filed on Feb. 27, 2020.
Prior Publication US 2021/0274604 A1, Sep. 2, 2021
Int. Cl. H05B 6/06 (2006.01); A47J 43/046 (2006.01); H02J 50/12 (2016.01); H02J 50/60 (2016.01); H02J 50/80 (2016.01); H05B 6/12 (2006.01); H05B 6/44 (2006.01)
CPC H05B 6/065 (2013.01) [H02J 50/12 (2016.02); H02J 50/60 (2016.02); H02J 50/80 (2016.02); H05B 6/44 (2013.01); A47J 43/046 (2013.01); H05B 6/12 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A wireless power transmission apparatus for induction heating comprising:
a working coil 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 configured to output, to the working coil, current at an operation frequency; and
a controller configured to:
calculate an eccentricity degree between the working coil and a reception coil of a target object,
control, in the wireless power transmission mode, the operation frequency based on the calculated eccentricity degree while performing wireless power transmission to the target object,
receive, from the target object, information regarding requested power while the operation frequency is set to a first operation frequency,
calculate input power of the working coil in response to the requested power,
calculate an input voltage to be set in the working coil based on the requested power,
based on a standby voltage being greater than or equal to the calculated input voltage, increase the calculated input voltage to match the standby voltage, and
based on the standby voltage being less than the calculated input voltage, decrease the calculated input voltage to match the standby voltage,
wherein the standby voltage with predetermined amplitude is maintained in the working coil based on the operation frequency being the first operation frequency.