公开(公告)号：US11233446B2

公开(公告)日：2022-01-25

申请号：US17082450

申请日：2020-10-28

Applicant: LG ELECTRONICS INC.

Inventor： Younghwan Kwack ,  Seongho Son ,  Seonho Jeon ,  Chuhyoung Cho ,  Jongseong Ji

IPC: H02M1/34 ,  H02M1/00 ,  H02M1/36 ,  H02M3/07

Abstract: A method is provided for operating a resonant power conversion apparatus The method may include charging a capacitor connected to a power source in parallel, and determining a discharge time point and a discharge period of a discharge circuit, where the discharge circuit includes a resistor and a switch connected in series and is connected to the capacitor in parallel. The method may also include outputting, by a switch control circuit, a switch control signal by determining the switch control signal based on the discharge time point and the discharge period, and discharging the charged capacitor through the resistor based on the switch control signal applied to the switch. A resonant power conversion apparatus for performing the above-described method is provided.

公开(公告)号：US11064577B2

公开(公告)日：2021-07-13

申请号：US16196559

申请日：2018-11-20

Applicant: LG Electronics Inc.

Inventor： Younghwan Kwack ,  Seongho Son ,  Jaekyung Yang ,  Yongsoo Lee

IPC: H05B6/06 ,  H05B6/12 ,  H05B6/40 ,  H02M3/24

Abstract: An induction heating device includes: a working coil set including a first working coil connected to a first resonant capacitor and a second working coil connected to a second resonant capacitor; an inverter that performs a switching operation to apply a resonant current to at least one of the first or second working coil; a current transformer that adjusts a magnitude of the resonant current and that transmits the resonant current having the adjusted magnitude to the working coil set; a first relay that selectively connects a first end of the second working coil to the current transformer or the second resonant capacitor; a second relay that selectively connects a to second end of the second working coil to an end of the first working coil or the second resonant capacitor; and a control unit configured to control operations of the inverter and the first and second relays, respectively.

公开(公告)号：US11950347B2

公开(公告)日：2024-04-02

申请号：US17142819

申请日：2021-01-06

Applicant: LG Electronics Inc. ,  ULSAN NATIONAL INSTITUTE OF SCIENCE AND TECHNOLOGY

Inventor： Younghwan Kwack ,  Jaekyung Yang ,  Seongho Son ,  Yongsoo Lee ,  Jeehoon Jung ,  Hwapyeong Park ,  Mina Kim

IPC: H05B6/06 ,  F24C15/10 ,  H02M3/06 ,  H02M7/10 ,  H05B1/02 ,  H05B6/12

CPC classification number: H05B6/065 ,  F24C15/106 ,  H02M3/06 ,  H02M7/103 ,  H05B1/0202 ,  H05B6/062 ,  H05B6/1236 ,  Y02B40/00

Abstract: An induction heat cooking apparatus that includes: a rectifier that is configured to convert alternating current (AC) voltage supplied from an external power source into direct current (DC) voltage; an inverter that is configured to generate current based on DC voltage received from the rectifier and provide the current to output nodes; heating coils that are configured to, based on the current generated by the inverter, generate magnetic fields for providing heat; a first capacitive unit that includes one or more resonance capacitors and that is coupled between the output nodes; a second capacitive unit that includes one or more wireless power transfer (WPT) capacitors and that is configured to be coupled between the output nodes; and a mode conversion switch that is configured to couple the second capacitive unit to the first capacitive unit in parallel is disclosed.

公开(公告)号：US11849525B2

公开(公告)日：2023-12-19

申请号：US17027071

申请日：2020-09-21

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：US11528782B2

公开(公告)日：2022-12-13

申请号：US16678781

申请日：2019-11-08

Applicant: LG Electronics Inc.

Inventor： Younghwan Kwack ,  Seongho Son ,  Jaekyung Yang ,  Yongsoo Lee

IPC: H05B6/06

Abstract: Described is a method for controlling an induction heating device having one or more working coils and a controller configured to perform pre-testing based on a single pulse. The method includes: selecting a working coil to be tested, performing a detection operation to detect a vessel disposed on the working coil and generate a first output pulse; comparing at least one of: a count of the first output pulse to a predetermined reference count range, or an on-duty time of the first output pulse to a predetermined reference time range; and adjusting, by the controller, a duration of an on-state of the single pulse based on (i) a result of the comparison of the count of the first output pulse to the predetermined reference count range or (ii) a result of the comparison of the on-duty time of the first output pulse to the predetermined reference time range.

公开(公告)号：US11337279B2

公开(公告)日：2022-05-17

申请号：US16390686

申请日：2019-04-22

Applicant: LG ELECTRONICS INC.

Inventor： Younghwan Kwack ,  Seongho Son ,  Jaekyung Yang ,  Yongsoo Lee

IPC: H05B6/06 ,  H05B6/12

Abstract: A method for sensing a container includes: charging an induction heating circuit; sensing a current applied to the induction heating circuit, converting a current value of the current into a first voltage value; comparing the first voltage value with a resonance reference value; generating a resonance of the current; sensing a resonant current generated in the induction heating circuit; converting the resonant current into a second voltage value; comparing the second voltage value with a count reference value; generating one or more output pulses; comparing a count of the one or more output pulses with a reference count, or comparing an on-duty time of the one or more output pulses with a reference time; and based on (i) the comparison of the count with the reference count or (ii) the comparison of the on-duty time with the reference time, determining whether an object is present on a working coil.

公开(公告)号：US11304270B2

公开(公告)日：2022-04-12

申请号：US16678803

申请日：2019-11-08

Applicant: LG Electronics Inc.

Inventor： Younghwan Kwack ,  Seongho Son ,  Jaekyung Yang ,  Yongsoo Lee

IPC: H05B6/12 ,  H05B6/06 ,  H05B6/36 ,  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.