公开(公告)号：US20220386423A1

公开(公告)日：2022-12-01

申请号：US17752009

申请日：2022-05-24

Applicant: LG Electronics Inc.

Inventor： Sihoon Jeong ,  Ho Yong Jang ,  Bada Yoon ,  Gwangrok Kim

IPC: H05B6/06 ,  H05B6/04 ,  H05B6/44 ,  G01R19/25

Abstract: An induction heating device according to and embodiment may include a working coil; an inverter circuit comprising a plurality of switching elements and configured to supply currents to the working coil; a rectifier circuit configured to rectify the voltage supplied from an external power source; a smoothing circuit configured smooth the voltage output from the rectifier circuit; a drive circuit configured to supply a switching signal to each of the switching circuits; a controller configured to supply a control signal for outputting the switching signal to the drive circuit; a shunt resistor connected between the smoothing circuit and the inverter circuit; an input current sensing circuit configured to sense an input current value of the inverter circuit based on a current flowing through the shunt resistor; and a resonance current sensing circuit a resonance current value of the working coil based on the current flowing through the shunt resistor

公开(公告)号：US11540360B2

公开(公告)日：2022-12-27

申请号：US16556504

申请日：2019-08-30

Applicant: LG ELECTRONICS INC.

Inventor： Wongyu Park ,  Gwangrok Kim ,  Bada Yoon

IPC: H05B6/06 ,  H05B6/12 ,  H05B6/64 ,  H05B6/44 ,  H05B6/08

Abstract: An induction heater device and a method for controlling an induction heating device are provided. The method may include determining a first target frequency of a first working coil corresponding to the drive command for the first working coil, determining a second target frequency of a second working coil corresponding to the drive command for the second working coil, and determining a final drive frequency of the first working coil and a final drive frequency of the second working coil based on the first target frequency and the second target frequency, respectively.

公开(公告)号：US11006485B2

公开(公告)日：2021-05-11

申请号：US16018158

申请日：2018-06-26

Applicant: LG ELECTRONICS INC.

Inventor： Jea Shik Heo ,  Gwangrok Kim ,  Heejun Lee

IPC: H05B6/06 ,  H05B6/12

Abstract: The present disclosure relates to an induction heating device. A loaded-object sensor according to the present disclosure is arranged concentrically and centrally in the working coil. Thus, the sensing coil and the working coil are adjacent to each other. When a current for the heating operation is applied to the working coil, an induction voltage is generated in the sensing coil by magnetic force generated by the current applied to the working coil. According to the present disclosure, a limiting circuit is used to reduce the induction voltage generated in the sensing coil when the heating operation of the working coil is performed.

公开(公告)号：US11943858B2

公开(公告)日：2024-03-26

申请号：US17218576

申请日：2021-03-31

Applicant: LG ELECTRONICS INC.

Inventor： Gwangrok Kim ,  Ho Yong Jang ,  Jung Youn Lee ,  Seongkyu Song

IPC: H05B6/06 ,  H05B6/04 ,  H05B6/36

CPC classification number: H05B6/06 ,  H05B6/04 ,  H05B6/36

Abstract: The present disclosure relates to an induction heating apparatus and a method of controlling the same. A controller of the induction heating apparatus according to the present disclosure may set an operation mode of an inverter circuit to a half bridge mode when a required power value of a working coil is set to a value less than a reference power value such that a driving frequency of the working coil decreases while an actual power value of the working coil is kept the same as the required power value. Additionally, the controller of the induction heating apparatus may adjust a duty ratio of a switching signal input to a switching element included in the inverter circuit, thereby adjusting the actual power value of the working coil.

公开(公告)号：US20230284347A1

公开(公告)日：2023-09-07

申请号：US18118266

申请日：2023-03-07

Applicant: LG ELECTRONICS INC. ,  UNIST(ULSAN NATIONAL INSTITUTE OF SCIENCE AND TECHNOLOGY)

Inventor： Jee Hoon JUNG ,  Gwangrok Kim ,  Hyunjun Choi ,  Kyung Wook Heo ,  Geunwook Kim

IPC: H05B6/06

CPC classification number: H05B6/062 ,  H05B2213/07

Abstract: A method for controlling an induction heating apparatus according to one embodiment includes receiving a heating start command; determining whether or not to perform a temperature correction operation based on a difference between a current driving start time point of a working coil and a previous driving end time point of the working coil; obtaining an equivalent resistance value of the working coil and a container placed on the working coil by driving the working coil at a preset reference frequency, when it is determined to perform the temperature correction operation; obtaining a temperature correction value based on the equivalent resistance value; obtaining a temperature value sensed by a temperature sensor; and correcting the temperature value based on the temperature correction value.