US 12,476,494 B2
Induction heating and wireless power transmitting apparatus having control algorithm
Seungbok Ok, Seoul (KR); Dooyong Oh, Seoul (KR); Hyunwook Moon, Seoul (KR); and Byeong Wook Park, Seoul (KR)
Assigned to LG Electronics Inc., Seoul (KR)
Filed by LG ELECTRONICS INC., Seoul (KR)
Filed on Mar. 28, 2023, as Appl. No. 18/127,193.
Application 18/127,193 is a division of application No. 16/643,503, abandoned, previously published as PCT/KR2018/009293, filed on Aug. 13, 2018.
Claims priority of application No. 10-2017-0111470 (KR), filed on Aug. 31, 2017; and application No. 10-2017-0173674 (KR), filed on Dec. 15, 2017.
Prior Publication US 2023/0253834 A1, Aug. 10, 2023
Int. Cl. H02J 50/60 (2016.01); H02J 5/00 (2016.01); H02J 7/02 (2016.01); H02J 50/12 (2016.01); H02J 50/40 (2016.01); H02J 50/80 (2016.01); H02J 50/90 (2016.01); H05B 1/02 (2006.01); H05B 6/06 (2006.01); H05B 6/44 (2006.01)
CPC H02J 50/60 (2016.02) [H02J 5/00 (2013.01); H02J 7/02 (2013.01); H02J 50/12 (2016.02); H02J 50/40 (2016.02); H02J 50/80 (2016.02); H02J 50/90 (2016.02); H05B 1/0266 (2013.01); H05B 6/065 (2013.01); H05B 6/44 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An apparatus for induction heating and wireless power transmission, the apparatus comprising:
a first group of working coils comprising a first working coil and a second working coil that are electrically connected to each other in parallel;
a first inverter configured to perform a switching operation to generate a resonance current in at least one of the first working coil or the second working coil;
a first semiconductor switch electrically connected to the first working coil and configured to turn on and turn off the first working coil;
a second semiconductor switch electrically connected to the second working coil and configured to turn on and turn off the second working coil;
a first resonance capacitor electrically connected between the first working coil and the first semiconductor switch;
a second resonance capacitor electrically connected between the second working coil and the second semiconductor switch; and
a controller configured to:
turn on the first semiconductor switch at a first time point P1,
provide the first inverter with N pulses from a starting time point P1′ to an end time point P1″, wherein a first delay is provided between the first time point P1 and the start time point P1′,
detect an attenuation degree of the resonance current generated in the first working coil,
detect whether an object is disposed above the first working coil based on the attenuation degree of the resonance current,
turn off the first semiconductor switch at a second time point P2, wherein a second delay is provided between the end time point P1″ and the second time point P2, and
turn on the second semiconductor switch at the second time point P2 at which the first semiconductor switch is turned off.