Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1984-07-17
1986-11-04
Beha, Jr., William H.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
307252L, 363 57, 363 68, H02H 712, H02M 1092
Patent
active
046213147
ABSTRACT:
An apparatus for controlling a thyristor converter includes a plurality of voltage detectors provided for individual series-connected thyristors respectively for detecting the presence or absence of voltage applied to the thyristors, and elements for generating a thyristor triggering pulse signal representative of the logical sum of the voltage presence-absence signals from the voltage detectors and a triggering command signal commanding the desired triggering phase and on-period of the thyristor converter. The apparatus comprises a plurality of differentiation circuits differentiating the output signals of the plural voltage detectors respectively, and a signal synthesis circuit synthesizing the output signals of the differentiation circuits to generate an output signal indicative of the voltage presence or absence. By virtue of the above construction, the thyristor converter can continuously operate without being shut down even when any one of the thyristor voltage detection signals is disabled.
REFERENCES:
patent: 3881147 (1975-04-01), Ueda et al.
patent: 4084206 (1978-04-01), Leowald et al.
patent: 4527227 (1985-07-01), Koseki
Beha Jr. William H.
Hitachi , Ltd.
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