公开(公告)号：US20210084721A1

公开(公告)日：2021-03-18

申请号：US16934891

申请日：2020-07-21

Applicant: LG Electronics Inc.

Inventor： Kyung Hoon JUNG ,  Dooyong OH ,  Byeong Wook PARK

IPC: H05B6/06 ,  H05B6/36

Abstract: An induction heating device includes: a working coil, an inverter, a current transformer, a current detecting circuit, a voltage detecting circuit, an AND circuit, and a controller. The induction heating device may detect presence or absence of an object and a material of the object based on a magnitude of resonance current applied to the working coil and a phase difference between the resonance current and a voltage applied to a switching element of the inverter.

公开(公告)号：US20210084722A1

公开(公告)日：2021-03-18

申请号：US17018842

申请日：2020-09-11

Applicant: LG Electronics Inc.

Inventor： Kyung Hoon JUNG ,  Dooyong OH ,  Byeong Wook PARK

IPC: H05B6/08 ,  H05B6/04 ,  F24C7/08 ,  H05B6/06 ,  G01R25/04 ,  G01R25/00

Abstract: An induction heating device includes a working coil, an inverter including a first switching element and a second switching element that are configured to perform a switching operation and to apply a resonance current to the working coil, a snubber capacitor including a first snubber capacitor connected to the first switching element, and a second snubber capacitor connected to the second switching element, a phase detector configured to detect a phase difference between the resonance current applied to the working coil and a switching voltage applied to the second switching element, and a controller configured to receive, from the phase detector, phase information including the phase difference, provide the inverter with a switching signal to thereby control the switching operation, and adjust an operating frequency of the switching signal based on the phase information to thereby control an output of the working coil.