Overvoltage protection circuit for an energy absorbing capacitor

Details Overvoltage protection circuit for an energy absorbing capacitor Overvoltage protection circuit for an energy absorbing capacitor

1991-03-11

1992-10-13

Beha, Jr., William H.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

361 91, 363 56, H02H 7122, H02M 106

Patent

active

051556740

ABSTRACT:
A protection device for a power converter utilizing GTO thyristors. A reactor is connected in series with the switching elements to suppress the current change rates. A capacitor is connected to the reactor by way of a coupling diode to receive and store energy from the reactor. An overvoltage prevention device is connected in parallel with the capacitor to keep the voltage of the capacitor below a set value. A single protection device may be utilized with a polyphase converter or a multiplex converter, thus providing a compact low cost protection device.

REFERENCES:
patent: 4378586 (1983-03-01), Bete
patent: 4703411 (1987-10-01), Umbricht
patent: 4926306 (1990-05-01), Ueda et al.
patent: 4947282 (1990-08-01), Kobayashi

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