公开(公告)号：US12038486B2

公开(公告)日：2024-07-16

申请号：US17602901

申请日：2020-04-07

Applicant: LS ELECTRIC CO., LTD.

Inventor： Chengde Xu ,  Chun-Suk Yang

IPC: G01R31/52 ,  G01R1/20 ,  G01R31/42 ,  H02H7/122

CPC classification number: G01R31/52 ,  G01R1/203 ,  G01R31/42 ,  H02H7/1227

Abstract: The present disclosure relates to an inverter system capable of detecting an output ground fault and an output ground fault detection method using same and, particularly, to an inverter for detecting an output ground fault by detecting the current of a leg-shunt resistor, and an inverter output ground detection fault method using same. The present disclosure compares absolute peak values of 3-phase current AD raw values detected from a shunt resistor, and thus may reliably detect the output ground fault of an inverter.

公开(公告)号：US11949324B2

公开(公告)日：2024-04-02

申请号：US17602907

申请日：2020-03-17

Applicant: LS ELECTRIC CO., LTD.

Inventor： Jae-Moon Lee ,  Chun-Suk Yang ,  Tae-Suk Bae

IPC: H02M1/32 ,  H02M7/5387 ,  H02P27/08 ,  H02P29/024

CPC classification number: H02M1/32 ,  H02M7/53871 ,  H02P27/08 ,  H02P29/027

Abstract: The present disclosure relates to an overcurrent protection inverter, and more particularly, to an inverter, which uses a leg-shunt resistor so as to detect an instantaneous maximum output current and an AD current, thereby performing an inverter protection operation. The present disclosure detects the instantaneous maximum output current and detects the AD current from the leg-shunt resistor so as to perform an overcurrent protection operation when an overcurrent occurs in the entire inverter operation section, thereby enabling protection of the inverter.

公开(公告)号：US11280835B2

公开(公告)日：2022-03-22

申请号：US17026965

申请日：2020-09-21

Applicant: LS ELECTRIC CO., LTD.

Inventor： Chun-Suk Yang ,  Hong-Seok Kim

IPC: G01R31/327 ,  H02P27/08 ,  H02M1/08 ,  H02M7/5387 ,  H02M1/32 ,  G01R31/42 ,  H02M7/797 ,  H02M1/00

Abstract: A diagnosing device of a three phase inverter is provided, which includes a relay connected in series with a capacitor disposed on a DC link, an initial charging resistor connected in parallel to the relay, an inverter comprising a switching device for controlling a power supply to three phase output lines, a current sensor disposed on a connection line connecting between the DC link and the inverter to sense a current, and a control unit for driving the switching device and diagnosing at least one of opening and shorting of the switching device according to whether the current is sensed or not.