Photo SI thyristor driving circuit and its protection circuit

Details Photo SI thyristor driving circuit and its protection circuit Photo SI thyristor driving circuit and its protection circuit

1994-07-11

1996-07-09

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

327438, 327440, H01H 4724

Patent

active

055347355

ABSTRACT:
A photo SI thyristor driving circuit which has a good switching characteristic suitable to be used for a photo relay, and a protection circuit therefor for protecting a photo SI thyristor element from being broken down due to a thermal runaway. The photo SI thyristor driving circuit comprises a photo SI thyristor, a MOS transistor provided in a gate circuit of the photo SI thyristor to draw charges accumulated at the gate of the photo SI thyristor when the photo SI thyristor is turned off, and a plurality of photo electromotive force elements provided in a gate circuit of the MOS transistor to generate a photo current for biasing the MOS transistor. The protection circuit includes a snubber circuit connected between the anode and the cathode of the photo SI thyristor and a light emitting element for irradiating light to the photo electromotive elements in response to an output from the snubber circuit.

REFERENCES:
patent: 3816763 (1974-06-01), Korn et al.
patent: 3967138 (1974-12-01), Mitsuoka et al.
patent: 4176288 (1979-11-01), Komatsu et al.
patent: 4322637 (1982-03-01), Tagasago
patent: 5017991 (1991-05-01), Nishizawa et al.

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