公开(公告)号：US20210352775A1

公开(公告)日：2021-11-11

申请号：US17313500

申请日：2021-05-06

Applicant: LG ELECTRONICS INC.

Inventor： Sihoon SEONG ,  Kyelyong Kang ,  Hanna Kim

IPC: H05B6/06 ,  H05B6/08 ,  H05B6/12 ,  H02M7/5387

Abstract: An induction heating apparatus may include first/second working coils, first/second inverter circuits and a controller. When a user changes a required power value of a first working coil or a second working coil to a third required power value, a controller determines a third driving frequency corresponding to the third required power value. The controller according to one embodiment calculates a difference value between a driving frequency of the working coil, the required power value of which is not changed, and the third driving frequency, and compares the calculated difference value with a predetermined first reference range. When the calculated difference value is included in the first reference range, the controller changes an operation mode of a first inverter circuit from a full bridge mode to a frequency doubler mode, and changes an output power value of the working coil the required power value of which is changed to the third required power value.