Protection arrangement for a switching device

Details Protection arrangement for a switching device Protection arrangement for a switching device

1996-12-30

1998-05-26

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

307130, 323284, 363 58, H02H 900

Patent

active

057575991

ABSTRACT:
To protect a switching device having a possible open-circuit failure condition, an arrangement is featured in which a thyristor is connected in parallel with the main current-carrying terminals of the switching device to be protected. The thyristor is connected so that the forward current direction of the thyristor is the same as the normal current direction through the main terminals of the switching device. The arrangement provides for the thyristor to present an irreversible effective short-circuit when its normal parameter ratings are exceeded. The protection arrangement is particularly suitable for insulated-gate bipolar transistors (IGBT's) and preferably employs a pressure-packaged asymmetrical thyristor (ASCR) as the protection thyristor. The ASCR should be selected to withstand the normal (snubber-limited) dV/dt of the voltage across the switching device.

REFERENCES:
patent: 4825272 (1989-04-01), Lehmann

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