Fault detector apparatus having serial fault-detection signal pa

Details Fault detector apparatus having serial fault-detection signal pa Fault detector apparatus having serial fault-detection signal pa

1986-12-15

1988-05-24

Salce, Patrick R.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 57, 363 68, H02H 7125

Patent

active

047470364

ABSTRACT:
A fault detector apparatus for a power converter in which a plurality of GTOs, functioning at a predetermined potential, are used. The apparatus includes a first fault-detecting circuit, coupled to the gate-cathode path of one of the GTOs, for generating a first fault signal when this GTO malfunctions, a second fault-detecting circuit, coupled to the gate-cathode path of another one of the GTOs, for generating a second fault signal when this GTO malfunctions, a photocoupler for transmitting a DC-isolated optical signal corresponding to the first fault signal, and one optical fiber system for transmitting a DC-isolated output signal, corresponding to the logical sum of the optical signal transmitted by the photocoupler and the second fault signal, to external circuits set at a potential different from the potential at which the GTOs are arranged. The fault-detecting circuits are provided in the same number as the GTOs. The fault-detecting circuits are coupled by the optical signals.

REFERENCES:
patent: 3842337 (1974-10-01), Ekstrom et al.
patent: 3878448 (1975-04-01), Jackson et al.
patent: 4384248 (1983-05-01), Matsuda et al.
patent: 4464585 (1984-08-01), Seki
patent: 4597038 (1986-06-01), Stacey

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