公开(公告)号：US20180294751A1

公开(公告)日：2018-10-11

申请号：US15660140

申请日：2017-07-26

Applicant: KOREA ELECTRONICS TECHNOLOGY INSTITUTE

Inventor： Joonsung PARK ,  Jinhong KIM ,  Byongjo HYON ,  Junhyuk CHOI

IPC: H02P6/12

CPC classification number: H02P6/12 ,  H02P6/085 ,  H02P6/18 ,  H02P29/0241

Abstract: Disclosed are an apparatus, system and method for detecting, based on a mathematical model, a fault of a permanent magnet motor driven by a square wave. A fault diagnosis apparatus for the permanent magnet motor includes a current voltage measurement unit, a phase shift time calculation unit, and a control unit.

公开(公告)号：US20210152158A1

公开(公告)日：2021-05-20

申请号：US17092843

申请日：2020-11-09

Applicant: KOREA ELECTRONICS TECHNOLOGY INSTITUTE

Inventor： Dongmyoung JOO ,  Junhyuk CHOI ,  Joonsung PARK ,  Jinhong KIM ,  Byongjo HYON ,  Yongsu NOH

IPC: H03K3/012

Abstract: This application relates to a wide band gap (WBG) power semiconductor system. In one aspect, the system includes a controller configured to generate a switching control signal and a gate driver configured to receive the switching control signal and generate a switching drive signal in response to the switching control signal. The system also includes a WBG power semiconductor device coupled to the gate driver, comprising a gate terminal for receiving the switching drive signal, and configured to be switched in response to the switching drive signal. The switching drive signal has one of three signal levels: a first voltage level higher than a zero voltage level, a second voltage level lower than the zero voltage level, and the zero voltage level at an arbitrary instant. As a result, the gate driver drives the WBG power semiconductor device with the three voltage levels.

公开(公告)号：US20200007056A1

公开(公告)日：2020-01-02

申请号：US16451192

申请日：2019-06-25

Applicant: KOREA ELECTRONICS TECHNOLOGY INSTITUTE

Inventor： Joonsung PARK ,  Junhyuk CHOI ,  Jinhong KIM ,  Byongjo Hyon ,  Yongsu NOH ,  Dongmyoung JOO

IPC: H02P6/182 ,  H02P6/10

Abstract: The present disclosure provides a motor drive device and a motor drive system for improving a control stability despite an imbalance in zero crossing points in a sensorless motor of which position of a rotor is estimated by a counter electromotive force. The motor drive device includes: a position detector configured to detect a rotational position of a rotor of a motor by detecting a plurality of zero crossing points of a counter electromotive force induced in the motor; and a controller configured to control the motor by estimating a phase change timing based on a time interval between a current zero crossing point and a previous zero crossing point of a same state as the current zero crossing point among the plurality of zero crossing points detected by the position detector.