Patent
1979-02-06
1981-11-03
Clawson, Jr., Joseph E.
357 55, 357 86, H01L 2974
Patent
active
042988802
ABSTRACT:
A power thyristor formed by four zones of alternating conductivity type and including at least one control gate, at least one generator gate in the vicinity of a respective control gate and at least one firing gate located further away from a respective control gate formed on portions of the cathode-base zone extending to the cathode-side main surface, in which the firing gate is electronically connected to the generator gate with no intervening cathode-base zone. The control gate, generator gate, firing gate, cathode zone and cathode base zone are dimensioned so that the ratio between the lateral path resistance of the cathode base zone between the generator gate and cathode zone, and the corresponding resistance between the firing gate and the cathode zone, and the ratio between the edge-length of the generator gate and the edge-length of the firing gate are such that a current furnished by the generator gate suffices to fire the thyristor in the region beneath the firing gate, even at low anode voltages and small firing currents.
REFERENCES:
patent: 4012761 (1977-03-01), Ferro et al.
patent: 4223331 (1980-09-01), Muller et al.
BBC Brown Boveri & Co. Ltd.
Clawson Jr. Joseph E.
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