公开(公告)号：US12270832B2

公开(公告)日：2025-04-08

申请号：US17801413

申请日：2021-01-07

Applicant: LS ELECTRIC CO., LTD.

Inventor： Jae Moon Lee ,  Tae Suk Bae

IPC: G01R1/20 ,  G01R31/327

Abstract: A device and a method for diagnosing a failure of an inverter initial charging circuit are provided. The device for diagnosing a failure of an initial charging circuit is advantageous as follows: it is possible to detect whether a relay of the initial charging circuit is malfunctioning or not by using a photocoupler connected in parallel with an initial charging resistor of the initial charging circuit, on the basis that, if a current flows through the initial charging resistor in a relay-on state, the photocoupler is turned on; and it is possible to prevent component failure or burnout from occurring due to a high current flowing through the initial charging resistor in the case of a relay failure.

公开(公告)号：USD1068755S1

公开(公告)日：2025-04-01

申请号：US29824880

申请日：2022-01-27

Applicant: LS ELECTRIC CO., LTD.

Designer： Youngsung Shin

公开(公告)号：US12255012B2

公开(公告)日：2025-03-18

申请号：US17760894

申请日：2020-03-12

Applicant: LS ELECTRIC CO., LTD.

Inventor： Yong Jun Park

IPC: H01F38/30 ,  H01F27/06 ,  H02B1/04 ,  H02B11/04

Abstract: The present disclosure relates to a bushing-type current transformer, and a switchboard having the bushing-type current transformer applied thereto, comprising: a binding plate; a bushing including a first fixing part and a second fixing part located on each of the two sides of the binding plate and each providing an accommodating space; and a current transformer fitted and fixed to the first fixing part of the bushing.

公开(公告)号：US12230942B2

公开(公告)日：2025-02-18

申请号：US17640640

申请日：2020-03-12

Applicant: LS ELECTRIC CO., LTD.

Inventor： E Jae Choi

IPC: H02B11/12 ,  B66C1/66 ,  B66C23/20

Abstract: The present invention relates to a device for lifting a circuit breaker of a switchgear, the device comprising: a rail part that is located above the switchgear and has a plurality of vertically arranged compartments; an elevating part that can be guided and move above the rail part, and lifts the circuit breaker; and a lifting bracket that is fixed to two facing side surfaces of the circuit breaker, is coupled to a hook block of the elevating part, and moves up and down according to the actions of the elevating part.

公开(公告)号：US20250037928A1

公开(公告)日：2025-01-30

申请号：US18841564

申请日：2023-02-01

Applicant: LS ELECTRIC CO., LTD.

Inventor： Yoon Sun LEE

IPC: H01F27/28 ,  H01F27/02 ,  H01F27/04 ,  H01F27/32 ,  H01F30/06

Abstract: The present disclosure discloses a mold transformer which is capable of further relaxing the ambient electric field distribution thereof, the mold transformer comprising: a winding part; a shield member formed in a columnar shape having a hollow space formed therein and formed of an electrically conductive material, wherein a part of a lead wire of the winding part is inserted through and coupled to the hollow space; and a mold part disposed to surround the winding part and the shield member and formed of an electrical insulation material.

公开(公告)号：US12198879B2

公开(公告)日：2025-01-14

申请号：US17911319

申请日：2021-03-03

Applicant: LS ELECTRIC CO., LTD.

Inventor： Han Baek Chung

IPC: H01H33/60 ,  H01H33/74 ,  H01H73/04 ,  H01H73/18

Abstract: Disclosed is an air circuit breaker. The air circuit breaker according to an embodiment of the present disclosure includes a CT magnet unit. The CT magnet unit is provided in the air circuit breaker to cover a movable contact point exposed to the outside. A CT magnet is provided inside a case that forms the outer shape of the CT magnet unit. The CT magnet independently forms a sub magnetic field or forms a main magnetic field together with an extinguishing magnet provided in an arc extinguishing unit. Due to the magnetic field formed by the CT magnet, an arc that is generated receives the application of an electromagnetic force directed toward the arc extinguishing unit. Accordingly, the generated arc can be quickly moved and extinguished.

公开(公告)号：US12155181B2

公开(公告)日：2024-11-26

申请号：US17797239

申请日：2021-01-05

Applicant: LS ELECTRIC CO., LTD.

Inventor： Sungjun Tak

IPC: H05K5/02 ,  H02B1/16 ,  H02B1/20 ,  H05K7/14

Abstract: A sub-module is disclosed. A sub-module according to an embodiment of the present invention comprises a short-circuiting control part. The short-circuiting control part comprises a movable member slidably coupled to a frame on which capacitor assemblies are seated. A variable connector is coupled to the movable member. Moreover, a plurality of short-circuiting blocks are arranged on the frame while being spaced away from each other. When the movable member has slid, the variable connector comes into contact with one or more short-circuiting blocks adjacent to each other to be electrically conductive. The short-circuiting blocks are connected to the capacitor assemblies, respectively, to be electrically conductive. Therefore, a plurality of capacitor elements can be short-circuited simultaneously only by moving the movable member.

公开(公告)号：US12154746B2

公开(公告)日：2024-11-26

申请号：US17912777

申请日：2021-03-03

Applicant: LS ELECTRIC CO., LTD.

Inventor： Han Baek Chung

IPC: H01H9/34 ,  H01H9/44 ,  H01H71/24 ,  H01H73/18

Abstract: The present disclosure relates to an arc extinguishing assembly, including side members which are spaced apart by a certain distance and disposed to face each other; an exhaust which is installed on an upper part of the side member; a plurality of grids which are installed between the side members and having both ends fixed to each of the side members; an arc guide having one end coupled to the side member and installed under the plurality of grids; and a magnet which is installed such that both ends are respectively coupled to the side members under the plurality of grids, and forms an electromagnetic force in a direction toward the grid, and a circuit breaker including the same.

公开(公告)号：US12154735B2

公开(公告)日：2024-11-26

申请号：US17911311

申请日：2021-03-03

Applicant: LS ELECTRIC CO., LTD.

Inventor： Il Hyun Kim

IPC: H01H33/18 ,  H01H31/26

Abstract: An arc extinguishing unit and an air circuit breaker comprising same are disclosed. An arc extinguishing unit, according to an embodiment of the present disclosure, comprises an extinguishing magnet unit that forms a magnetic field inside the arc extinguishing unit. Accordingly, a generated arc receives an electromagnetic force in the direction facing the exterior of the air circuit breaker, and thus can be rapidly moved and extinguished. The extinguishing magnet unit is accommodated in a magnet case. The magnet case can seal the extinguishing magnet unit. Therefore, the extinguishing magnet unit is not damaged by the generated arc.

公开(公告)号：US20240388080A1

公开(公告)日：2024-11-21

申请号：US18691963

申请日：2022-10-12

Applicant: LS ELECTRIC CO., LTD.

Inventor： Dongjin YUN ,  Sunghee KANG ,  Woonghyeob SONG

IPC: H02H9/00 ,  H02H3/02 ,  H02H3/093

Abstract: The present disclosure relates to a solid state circuit breaker, comprising: a semiconductor switch unit including a semiconductor switch that electrically connects or disconnects a power system and a load according to a voltage applied to a gate terminal; and a control unit that, when the semiconductor circuit breaker is turned on, controls the semiconductor switch to repeat turn-on and turn-off operations for a predetermined initial driving time so as to gradually alleviate the magnitude of inrush current caused by an initial connection between the power system and the load.