Lg Electronics Inc.

Unist, Inc.

Sihoon Jeong

Kyelyong Kang

Hanna Kim

Wongyu Park

Bada Yoon

Jee Hoon Jung

Hwa Pyeong Park

Jinwook Han

A controller of the induction heating apparatus in one embodiment may determine an overlapped period of a resonance current value of a working coil and a driving voltage value of a switching element included in an inverter circuit. The overlapped period may denote a period for which the resonance current value and the driving voltage value are all positive numbers. The controller may determine whether a driving state of the induction heating apparatus is normal or abnormal based on a time point at which the overlapped period appears. When determining that the driving state of the induction heating apparatus is abnormal, the controller may stop driving of the working coil.

Induction heating apparatus and method for controlling the same

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 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 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.

Induction heating apparatus and method for controlling same

An induction heating apparatus according to one embodiment may confirm a feature of a container and determine an operation mode based on the feature of the container before performing an operation of heating the container. In one embodiment, the operation mode of the induction heating apparatus may be determined as any one of a frequency doubler mode, a half bridge mode, and a full bridge mode. In one embodiment, a power control mode of the induction heating apparatus may be determined based on an operation mode of the induction heating apparatus. In one embodiment, the power control mode of the induction heating apparatus may be determined as any one of an asymmetric pulse width modulation (APWM) mode and a phase shift mode.

An induction heating apparatus is configured to determine a third driving frequency corresponding to a third required power value when the required power value of the first working coil or the second working coil is changed to the third required power value, to calculate a difference value between the driving frequency of the working coil (the required power value of which is not changed) and the third driving frequency, to change an operation mode or a power control mode of the first inverter circuit or the second inverter circuit when the difference value is included in a predetermined first reference range, and to change an output power value of the working coil (the required power value of which is changed) to the third required power value.

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Seoul, South Korea

Sihoon Jeong