公开(公告)号：US20230170789A1

公开(公告)日：2023-06-01

申请号：US17919413

申请日：2021-04-08

Applicant: LG Electronics Inc.

Inventor： Younghwan KWACK ,  Seongho SON ,  Seonho JEON ,  Chuhyoung CHO ,  Jongseong JI

IPC: H02M1/32 ,  H02M3/155 ,  H02M1/00

CPC classification number: H02M1/32 ,  H02M3/155 ,  H02M1/0058

Abstract: A protection circuit of a resonant converter including first and second switches, where the protection circuit comprises: a comparator configured to (i) compare a direct current (DC) link voltage of the resonant converter with a voltage across both ends of one of the first or second switches and (ii) output one or more signals based on the comparison, and a microcomputer configured to detect whether zero voltage switching is performed, based on the one or more output signals from the comparator.

公开(公告)号：US20210315067A1

公开(公告)日：2021-10-07

申请号：US17025559

申请日：2020-09-18

Applicant: LG Electronics Inc.

Inventor： Younghwan KWACK ,  Seongho SON ,  Seonho JEON ,  Chuhyoung CHO ,  Jongseong JI

IPC: H05B6/10 ,  H05B6/12

Abstract: An induction heating type cooktop includes a case, an upper plate coupled to a top of the case and configured to support a target heating object, a working coil disposed inside the case and configured to heat the target heating object, a thin film disposed at a top surface of the upper plate or a bottom surface of the upper plate, and an insulator disposed between the bottom surface of the upper plate and the working coil. The thin film includes a plurality of sub-thin films that are arranged about a central portion of the working coil. Each of the plurality of sub-thin films defines a closed loop surrounding the central portion of the working coil. The thin firm further includes a heat conduction member that is arranged in a predetermined pattern and contacts at least one of the plurality of sub-thin films.

公开(公告)号：US20210281160A1

公开(公告)日：2021-09-09

申请号：US16987818

申请日：2020-08-07

Applicant: LG ELECTRONICS INC.

Inventor： Seonho JEON ,  Seongho SON ,  Younghwan KWACK ,  Chuhyoung CHO ,  Jongseong JI

IPC: H02M1/08 ,  H05B6/12

Abstract: Provided is a resonant power conversion apparatus including a gate control circuit that controls a first switch to enter an On state and a second switch to enter an Off state at a first stage and controls the first switch to enter the Off state and the second switch to enter the On state at a second stage, a first current transformer that applies current to the first switch at the first stage and applies current to the second switch at the second stage, a load connected to the first current transformer in series, a second current transformer connected to the second switch, and a microcontroller unit (MCU) that determines whether to be zero voltage switching or non-zero voltage switching based on a current flowing in the first current transformer and the second current transformer in a process of transitioning from the first stage to the second stage.

公开(公告)号：US20200154531A1

公开(公告)日：2020-05-14

申请号：US16678803

申请日：2019-11-08

Applicant: LG Electronics Inc.

Inventor： Younghwan KWACK ,  Seongho SON ,  Jaekyung YANG ,  Yongsoo LEE

IPC: H05B6/36 ,  H05B6/06 ,  H05B6/12 ,  H05B1/02

Abstract: An induction heating device includes a working coil, an inverter including a first switching element and a second switching element; a gate driver including a first sub-gate driver and a second sub-gate driver; and a protection circuit disposed between the inverter and the gate driver. The protection circuit includes a first resistor disposed between a gate terminal of the first switching element and an output terminal of the first sub-gate driver, a second resistor connected electrically in parallel to the first resistor, a protection circuit resistor disposed between a reference voltage terminal of the first sub-gate driver and a first node between the first switching element and the second switching element, a protection circuit diode disposed between a ground and a second node between the protection circuit resistance and the reference voltage terminal, and a bootstrap circuit disposed between the second node and the external power supply.

公开(公告)号：US20200029397A1

公开(公告)日：2020-01-23

申请号：US16390665

申请日：2019-04-22

Applicant: LG Electronics Inc.

Inventor： Younghwan KWACK ,  Kyelyong KANG ,  Seongho SON ,  Seonho JEON

IPC: H05B6/06 ,  H05B6/12

Abstract: An induction heating device includes an induction heating circuit, a sensor configured to measure current applied to the induction heating circuit, and a controller. The controller includes: a switch driving unit configured to control operation of an inverter unit and to allow a resonance of the current, a container sensing unit, and a control unit. The container sensing unit is configured to: convert a first current value before the resonance into a first voltage value; control the switch driving unit to charge a working coil; compare the first voltage value with a resonance reference value; convert a second current value after the resonance into a second voltage value; generate one or more output pulses; and compare the second voltage value with a count reference value. The control unit is configured to determine whether an object is present on the working coil based on the one or more output pulses.

公开(公告)号：US20250039999A1

公开(公告)日：2025-01-30

申请号：US18715944

申请日：2022-05-25

Applicant: LG Electronics Inc.

Inventor： Chuhyoung CHO ,  Seongho SON ,  Younghwan KWACK ,  Seonho JEON ,  Jongseong JI

IPC: H05B6/12

Abstract: Provided is an induction heating type cooktop that senses overheating of a thin film to prevent the thin film from being overheated. The induction heating type cooktop includes a case, a cover plate coupled to an upper end of the case and configured to comprise an upper plate, on which an object to be heated is disposed on a top surface thereof, a thin film applied on the upper plate, a working coil configured to generate magnetic fields for heating the object to be heated, and a controller configured to determine whether the thin film is overheated and reduce an output level when the thin film is overheated.

公开(公告)号：US20240064878A1

公开(公告)日：2024-02-22

申请号：US18501911

申请日：2023-11-03

Applicant: LG Electronics Inc.

Inventor： Chuhyoung CHO ,  Seongho SON ,  Younghwan KWACK ,  Seonho JEON ,  Jongseong JI

IPC: H05B6/12 ,  H05B6/06

CPC classification number: H05B6/1272 ,  H05B6/065

Abstract: An induction heating type cooktop includes a case, an upper plate coupled to a top of the case and configured to support an object, a working coil disposed inside the case and configured to heat the object, a thin film arranged at a top surface of the upper plate or a bottom surface of the upper plate, at least one temperature sensor configured to measure a temperature of at least one of components of the induction heating type cooktop, the components including the thin film, and a microcontroller unit (MCU) configured to drive the working coil and to control an output of the working coil based on whether the temperature satisfies at least one condition that is preset for the at least one of the components.

公开(公告)号：US20240015857A1

公开(公告)日：2024-01-11

申请号：US18265068

申请日：2021-01-12

Applicant: LG Electronics Inc.

Inventor： Chuhyoung CHO ,  Seongho SON ,  Younghwan KWACK

IPC: H05B6/06 ,  H05B6/10

CPC classification number: H05B6/062 ,  H05B6/105 ,  H05B2213/05

Abstract: An induction heating type cooktop according to an embodiment of the present disclosure may comprise: a case; a cover plate which is coupled to an upper end of the case and has an upper plate portion having an upper surface on which an object to be heated is disposed; a working coil provided inside the case; an inverter for applying a voltage to the working coil; a thin film which is provided on the lower surface of the upper plate portion and is inductively heated by the working coil; and a magnetic container determination unit which determines whether a magnetic container is present on the upper surface of the upper plate portion on the basis of an output power according to an operating frequency of the inverter.

公开(公告)号：US20230397305A1

公开(公告)日：2023-12-07

申请号：US18032060

申请日：2020-12-15

Applicant: LG Electronics Inc.

Inventor： Seonghoon HWANG ,  Wontae KIM ,  Seongjun KIM ,  Seongho SON ,  Younghwan KWACK

IPC: H05B6/12

CPC classification number: H05B6/1254 ,  H05B2206/02 ,  H05B6/1263 ,  H05B6/1281

Abstract: The present disclosure comprises: a case; a cover plate coupled to the upper end of the case and provided with an upper plate on which an object to be heated is disposed; a working coil provided inside the case; a thermal insulation material provided between the upper plate and the working coil; a first thin film provided on the lower surface of the upper plate and the inductively heated by the working coil; and a second thin film provided on the upper surface of the upper plate and contacting the object to be heated.

公开(公告)号：US20230337336A1

公开(公告)日：2023-10-19

申请号：US18213699

申请日：2023-06-23

Applicant: LG Electronics Inc.

Inventor： Seonho JEON ,  Seongho SON ,  Younghwan KWACK ,  Chuhyoung CHO ,  Jongseong JI

IPC: H05B6/06 ,  F24C15/10 ,  H05B1/02 ,  H05B6/12

CPC classification number: H05B6/062 ,  F24C15/104 ,  F24C15/105 ,  H05B1/0266 ,  H05B6/1245 ,  H05B2213/07

Abstract: An induction heating type cooktop includes an upper plate coupled to a top side of a case and configured to place an object to be heated on a top of the upper plate, a working coil disposed inside the case to heat the object, a thin film disposed on at least one of a top surface or a bottom surface of the upper plate, an insulator disposed between the bottom surface of the upper plate and the working coil, and a temperature sensor configured to measure a temperature of at least one of the thin film or the upper plate by a plurality of thermocouples.