Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1982-09-30
1984-09-11
Shoop, William M.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
363136, 363 68, H02H 7125
Patent
active
044714211
ABSTRACT:
A hybrid phase-controlled rectifying bridge includes both controlled and uncontrolled electric valves referred to as thyristors and diodes, respectively. Each of a pair of thyristors is periodically fired at an "angle" that can be advanced or retarded as desired, whereupon load current commutates to the thyristor from the corresponding diode. Subsequently the thyristor is turned off at a desired extinction angle by the action of cyclically operative forced commutation means. To avoid reverse recovery overvoltages across a diode when the desired extinction angle is only slightly larger than the firing angle, means is provided for temporarily preventing any turnoff action during the diode-to-thyristor commutation interval and for an additional interval that gives the diode sufficient time to fully recover its reverse blocking capability.
REFERENCES:
patent: 3213349 (1965-10-01), Gutzwiller
patent: 3392319 (1968-07-01), McColl et al.
patent: 3849718 (1974-11-01), F/o/ rster et al.
patent: 4181932 (1980-01-01), Fujiwara
patent: 4306283 (1981-12-01), Kiwaki et al.
patent: 4377835 (1983-03-01), Asplund et al.
Brown Herbert J.
Horvat Ivan N.
Kumar Ajith K. N.
General Electric Company
Richardson, Jr. Albert S.
Shoop William M.
Sterrett Jeffrey
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