Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Patent
1998-01-06
1999-12-28
Wong, Peter S.
Electric power conversion systems
Current conversion
Including an a.c.-d.c.-a.c. converter
363 55, 318729, H02M 545, H02H 7125, H02P 540
Patent
active
060090030
ABSTRACT:
A current/voltage control apparatus for an elevator system which is capable of preventing an over current from being applied to an inverter by stopping a driving operation of the inverter when a difference (hereinafter called "current deviation") between a current instruction and actual current value exceed a predetermined value during a predetermined time. The apparatus includes a voltage limiter for setting a limit voltage value which is proportional to an operational frequency of the induction motor and applying the voltage below the limit voltage value to the inverter driving unit, a zero phase component current detector for detecting a zero phase component current and outputting an inverter driving stop signal to the inverter driving unit when the thusly detected current exceeds a predetermined reference value, and a current deviation detector for detecting a current deviation value and outputting an inverter driving stop signal to the inverter driving unit when the current deviation value, which exceeds a predetermined reference value, is continuously maintained for a predetermined time.
REFERENCES:
patent: 4935684 (1990-06-01), Watanabe
patent: 4958117 (1990-09-01), Kerkman et al.
patent: 5483167 (1996-01-01), Mikami
patent: 5550450 (1996-08-01), Palko et al.
LG Industrial Systems Co. Ltd.
Patel Rajnikant B.
Wong Peter S.
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