Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1990-03-20
1992-03-24
Beha, Jr., William H.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
363 68, 363 81, H02H 7127, H02M 7155
Patent
active
050994093
ABSTRACT:
An improved electric power conversion system comprising a multi-phase bridge circuit composed of semiconductors such as thyristors and an associated firing circuit. It is so constructed that: if the AC input current Iac flowing in the bridge circuit is equal to or larger in value that the DC output current Idc flowing out of the bridge circuit, it will be decided than an inner defect or fault is caused, and possible expansion of inner defect will be prevented by disabling the firing circuit to extinguish the thyristors in the bridge circuit, and if the AC input current Iac is smaller than the DC output current Idc in value, the bridge is permitted to continue the operation of power conversion, thus eliminating unnecessary interruption which otherwise would be caused by exterior disturbances. Also, an improved electric power conversion system may be equipped with a device to prevent an adverse effect from being caused by abnormal rise of thyristors' temperature.
REFERENCES:
patent: 4429357 (1984-01-01), Hausler et al.
Bando Akira
Kawai Tadao
Kita Eizo
Mitsuhashi Keiichi
Nakagawa Hiroto
Beha Jr. William H.
Hitachi , Ltd.
The Kansai Electric Power Co. Inc.
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