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1. (WO2017204938) SYSTEM AND METHOD FOR INTELLIGENT CIRCUIT BREAKING IN ADJUSTABLE SPEED DRIVES

Pub. No.:    WO/2017/204938    International Application No.:    PCT/US2017/028061
Publication Date: Fri Dec 01 00:59:59 CET 2017 International Filing Date: Wed Apr 19 01:59:59 CEST 2017
IPC: H02M 1/32
G01R 19/165
H02M 1/44
H02M 5/45
Applicants: EATON CORPORATION
Inventors: LI, Xiaoling
LI, Huaqiang
FENTON, Robert A.
LU, Zhiguo
LEI, Belly
Title: SYSTEM AND METHOD FOR INTELLIGENT CIRCUIT BREAKING IN ADJUSTABLE SPEED DRIVES
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.