公开(公告)号：US09673695B1

公开(公告)日：2017-06-06

申请号：US15163411

申请日：2016-05-24

Applicant: Eaton Corporation

Inventor： Xiaoling Li ,  Huaqiang Li ,  Robert Fenton ,  Zhiguo Lu ,  Belly Lei

IPC: H02M1/32 ,  H02M5/45 ,  H02M1/44 ,  G01R19/165

CPC classification number: H02M7/125 ,  H02H7/1216

Abstract: An ASD circuit includes an input, solid-state switch rectifier bridge, DC link, and DC link capacitor bank. A pre-charge circuit is coupled between the input and the DC link capacitor bank and includes pre-charge relays operable in an on state that allows the AC power input to power the rectifier bridge during a normal operating state and an off state that allows the AC power input to pre-charge the DC link capacitor bank through a pre-charge resistor of the pre-charge circuit during a pre-charge operating state. A protection relay of a protection circuit is coupled between the pre-charge relays and the DC link capacitor bank, the protection relay operable in an on state that prevents the pre-charge circuit from connecting to the DC link capacitor bank when a capacitor short circuit occurs and an off state that allows the pre-charge circuit to electrically connect to the DC link capacitor bank.