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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
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.
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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
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.
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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
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.
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公开(公告)号：US20210127463A1
公开(公告)日：2021-04-29
申请号：US17141749
申请日：2021-01-05
Applicant: LG Electronics Inc.
Inventor： Seongho SON , Jaekyung YANG , Hyojin CHOI , Yongsoo LEE
Abstract: An induction heat cooking apparatus includes a rectifier configured to convert an AC voltage supplied from a power source into a DC voltage, a battery configured to store power, a switch configured to connect to at least one of the rectifier or the battery, an inverter connected to the switch and configured to receive a first voltage from at least one of the rectifier or the battery and convert the first voltage to a second voltage, and a heating coil configured to receive the second voltage from the inverter and generate magnetic fields in which the heating coil is configured to heat a cooking device based on the generated magnetic fields.
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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
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.
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Patent Agency Ranking
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
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.
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公开(公告)号：US20190387585A1
公开(公告)日：2019-12-19
申请号：US16477753
申请日：2018-01-05
Applicant: LG ELECTRONICS INC.
Inventor： Bong Jin CHO , Jinwook HAN , Seongho SON
Abstract: The present invention relates to an induction heating cooker including a synchronization circuit for a plurality of inverters, comprising: a first inverter including a first switching circuit unit for applying a first power source to a first heating coil, and a first control unit for controlling the first switching circuit unit; and a second inverter including a second switching circuit unit for applying a second power source to a second heating coil, and a second control unit for controlling the second switching circuit unit, wherein the first inverter further includes a first insulated signal transfer unit for controlling an operation of the second switching circuit unit, and the first control unit may match an operating frequency of the second switching circuit unit with an operating frequency of the first switching circuit unit by using the first insulated signal transfer unit.
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公开(公告)号：US20190306928A1
公开(公告)日：2019-10-03
申请号：US16276180
申请日：2019-02-14
Applicant: LG Electronics Inc.
Inventor： Hyojin CHOI , Seongho SON , Jaekyung YANG , Yongsoo LEE
Abstract: An induction heating device includes: a casing; a cover plate coupled to a top of the casing, where the cover plate has a surface configured to seat an object; a first induction heating module located within the casing and configured to heat the object; a first wiring substrate that is configured to couple to a bottom of the first induction heating module and that extends in a first direction, where the first wiring substrate includes at least one of a power line or a signal line; and a first connector that is configured to couple the first wiring substrate to the bottom of the first induction heating module, where the first connector includes a pogo pin.
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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.
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公开(公告)号：US20240298386A1
公开(公告)日：2024-09-05
申请号：US18664473
申请日：2024-05-15
Applicant: LG Electronics Inc.
Inventor： Seongho SON , Jaekyung YANG , Hyojin CHOI , Yongsoo LEE
Abstract: An induction heat cooking apparatus includes a rectifier configured to convert an AC voltage supplied from a power source into a DC voltage, a battery configured to store power, a switch configured to connect to at least one of the rectifier or the battery, an inverter connected to the switch and configured to receive a first voltage from at least one of the rectifier or the battery and convert the first voltage to a second voltage, and a heating coil configured to receive the second voltage from the inverter and generate magnetic fields in which the heating coil is configured to heat a cooking device based on the generated magnetic fields.
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