公开(公告)号：US20210003636A1

公开(公告)日：2021-01-07

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

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.