Patent ID: 11924949
Assignee: LG ELECTRONICS INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  F  Y | IPC F  H

Claim 0:
1. An induction heating device, comprising:
a heating coil provided in a main body;
a knob switch attached to a knob area formed on one surface of the main body;
a resonance detecting unit configured to output a frequency pulse based on a resonance characteristic between the resonance detecting unit and the knob switch, wherein the resonance characteristic is varied depending on a rotation of the knob switch; and
a controller configured to control a thermal power of the heating coil based on the frequency pulse output by the resonance detecting unit,
wherein the knob switch comprises a first coil, a first capacitor having a first capacitance value, a second capacitor having a second capacitance value different from the first capacitance value, and a switch element that switches the first coil to be connected to the first capacitance or the second capacitor,
wherein the resonance detecting unit comprises a second coil that is magnetically coupled to the first coil included in the knob switch and a resonance detector that outputs the frequency pulse, and
wherein the resonance detector outputs the frequency pulse corresponding to a capacitance value of one of the first capacitor and the second capacitor connected to the first coil, based on the switching of the switch element.