Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1978-12-18
1980-08-19
Miller, J. D.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
363 87, 363129, H02H 7125
Patent
active
042187290
ABSTRACT:
In association with a polyphase rectifying bridge having controlled rectifiers there is employed, in addition to the normal means for controlling the firing time of the controlled rectifiers, additional circuitry for preventing the occurrence of a commutation fault. This is achieved by first producing a timing signal representative of the time intervals during which a commutation between successively fired controlled rectifiers of the bridge actually exist. This timing signal, after being properly shaped is combined with a basic reference signal representative of a predetermined value to which the rectifiers may be phased back in their firing angle without resulting in a commutation failure. Stated in another way, the width of the existing commutation period serves to set a minimum to which the next commutation period must conform. When the prescribed relationships exist between the timing signal and the basic reference signal, the normal control means is overriden and the firing angle of the controlled rectifier is advanced to a point which will insure commutation.
REFERENCES:
patent: 3701938 (1972-10-01), Chadwick
patent: 4016468 (1977-04-01), Graf
patent: 4028607 (1977-06-01), Watanabe
General Electric Company
Miller J. D.
Renner Arnold E.
Wong Peter S.
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