US 11,895,759 B2
Induction heating apparatus
Masashi Sasagawa, Yokohama (JP); Masaki Ono, Yokohama (JP); Masayuki Otawara, Yokohama (JP); Nobuharu Nishikoori, Yokohama (JP); Taro Yoshida, Yokohama (JP); Tomoyuki Kanagawa, Yokohama (JP); and Yutaka Yagi, Yokohama (JP)
Assigned to Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed on Mar. 4, 2021, as Appl. No. 17/192,239.
Claims priority of application No. 2020-047466 (JP), filed on Mar. 18, 2020; and application No. 10-2020-0187185 (KR), filed on Dec. 30, 2020.
Prior Publication US 2021/0298134 A1, Sep. 23, 2021
Int. Cl. H05B 6/08 (2006.01); H05B 6/12 (2006.01)
CPC H05B 6/08 (2013.01) [H05B 6/1272 (2013.01); H05B 2213/05 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An induction heating apparatus comprising:
a heating coil comprising a first heating coil, a second heating coil provided inside the first heating coil, and an intermediate point to which the first heating coil and the second heating coil are connected;
an inverter is provided in a full-bridge type in which a first arm and a second arm are connected in parallel, wherein each of the first arm and the second arm comprises two switching elements connected in series;
a first relay provided between a first node and one end of the first heating coil, wherein the first node is an intermediate node arranged between the switching elements of the first arm of the inverter;
a capacitor provided between the end of the first heating coil and the first node of the inverter;
a second relay provided between a second node of the second arm of the inverter and the intermediate point of the heating coil;
a third relay provided between the second node of the inverter and an end of the second heating coil, wherein the end of the second heating coil is on the opposite side of the intermediate point to which the first heating coil and the second heating coil are connected; and
a processor configured to:
detect a presence or an absence of a container on the heating coil, based on an output current of the inverter, and
open or close the first relay based on a detection result of the container.