公开(公告)号：US20250167685A1

公开(公告)日：2025-05-22

申请号：US18839879

申请日：2023-02-16

Applicant: LS ELECTRIC CO., LTD.

Inventor： Kwang Kyu HWANG ,  Jae Ho LEE ,  Jeong Woo LIM

IPC: H02M3/335 ,  H02M1/00

Abstract: The present disclosure provides a power supply device for supplying, using a DC link voltage of a high-voltage unit of a semiconductor transformer, a control power to a transformer control unit for controlling the high-voltage unit, the power supply device comprising: a converter unit which includes a transformer unit and a switch connected in series to a primary side of the transformer unit, is connected to a DC link of the high-voltage unit, and is configured to convert the DC link voltage and output the converted DC link voltage to a transformer control unit; and a converter control unit configured to control on/off of the switch to convert the DC link voltage, wherein the converter unit comprises a first to a (n+1)th converter (wherein, n is an integer greater than or equal to 1) connected in series.

公开(公告)号：US20220376624A1

公开(公告)日：2022-11-24

申请号：US17627056

申请日：2020-03-16

Applicant: LS ELECTRIC CO., LTD.

Inventor： Sung Ho BAE ,  Jae Ho LEE

IPC: H02M3/158 ,  H02M1/00

Abstract: Disclosed is a DC-DC converter of a power conversion system. comprising first to fourth switches; fifth to eighth switches; a first capacitor connected to the first and second switches; a second capacitor connected to the fifth and sixth switches; a third capacitor connected to the third and fourth switches; a fourth capacitor connected to the seventh and eighth switches; a first inductor connected to a first node between the first and second switches, and a second node between the fifth and sixth switches; and a second inductor connected to a third node between the third and fourth switches, and a fourth node between the seventh and eighth switches, wherein the first and second inductors are coupled inductors, and a fifth node between the second and third switches, and a sixth node between the sixth and seventh switches are electrically equivalent.

公开(公告)号：US20250125735A1

公开(公告)日：2025-04-17

申请号：US18726032

申请日：2023-02-16

Applicant: LS ELECTRIC CO., LTD.

Inventor： Sun Ho BAE ,  Jae Ho LEE

IPC: H02M3/335 ,  H02M1/00

Abstract: A DC-DC converter according to an embodiment of the present disclosure comprises: a first stage converter for stepping up or stepping down an input voltage and outputting same; and a second stage converter connected to an output of the first stage converter. The first stage converter may comprise: first to fourth switches connected in series; fifth to eighth switches connected in series; a first capacitor connected in parallel with the series connection of the first and second switches; a second capacitor connected in parallel with the series connection of the third and fourth switches; a third capacitor connected in parallel with the series connection of the fifth and sixth switches; a fourth capacitor connected in parallel with the series connection of the seventh and eighth switches; a first inductor electrically connected to a first node between the first and second switches and a second node between the fifth and sixth switches; and a second inductor electrically connected to a third node between the third and fourth switches and a fourth node between the seventh and eighth switches.

公开(公告)号：US20220286041A1

公开(公告)日：2022-09-08

申请号：US17629675

申请日：2020-03-12

Applicant: LS ELECTRIC CO., LTD.

Inventor： Sun Ho BAE ,  Jae Ho LEE

IPC: H02M1/32 ,  H02M1/00 ,  H02M1/08 ,  H02M5/458

Abstract: Disclosed are an overcurrent protection device and a power conversion device using same. A power conversion device according to an embodiment of the present disclosure comprises: a control unit for providing a collector-emitter voltage to a switching element by means of a first output node; and an overcurrent protection circuit connected in a line between the first output node and the switching element and for limiting the overcurrent of the switching element.

公开(公告)号：US20240088643A1

公开(公告)日：2024-03-14

申请号：US18274406

申请日：2022-03-21

Applicant: LS ELECTRIC CO., LTD.

Inventor： Sun Ho BAE ,  Jae Ho LEE

IPC: H02H7/12 ,  H02M3/158

CPC classification number: H02H7/1213 ,  H02M3/158

Abstract: A DC-DC converter can include a driving circuit comprising a switch part and a flying capacitor configured to convert an input voltage of an input side into an output voltage of an output side, and a protection circuit configured to be connected to the output side. The protection circuit can be configured to block the fault current flowing to the switch part by lowering the output voltage step by step when a fault occurs.