A.c. solid state relay circuit and thyristor structure

Details A.c. solid state relay circuit and thyristor structure A.c. solid state relay circuit and thyristor structure

H - Electricity

01

L

345/24

H01L 31/02 (2006.01)

Patent

CA 1234420

ABSTRACT OF THE DISCLOSURE The present invention provides a lateral thyristor which is optically fired comprising a chip of semiconductor material having a p-n junction-receiving surface of one con- ductivity type; an anode region of the other conductivity type and a base region of said other conductivity type each formed into said surface and laterally spaced from one another; characterized in that an emitter region of said one conductivity type formed in and totally contained within said base region and extending therein from said surface; anode and cathode electrodes connected to said anode and emitter regions respectively and radiation means for illu- minating at least a portion of said surface for turning on said thyristor; an auxiliary region of said other conduc- tivity type formed in said surface and laterally spaced from and surrounding said base region; and a device for resistively connecting in permanent fashion said auxiliary region to said cathode electrode. The invention also provides an optically triggered thyristor comprising a semiconductor substrate of one of the conductivity types, characterized in that said substrate has at least first and second elongated spaced, and parallel base regions of the other conductivity types extending into the surface of said substrate; an auxiliary region of the other of the conductivity types extending into the surface of said substrate and laterally spaced from and surrounding substantially the full periphery of said base region; respective emitter regions of said one of said conductivity types extending into said surface of at least first and second parallel base regions and being com- pletely contained within their said respective base regions; respective elongated anode regions of said other of said conductivity types extending into said substrate and respec- tively disposed on opposite elongated sides of, laterally spaced form, and situated in parallel with each of said par- allel base regions; said base regions being situated between respective anode regions; an anode contact connected to said anode regions; a cathode contact connected to said emitter regions; means for resistively connecting in permanent fashion said auxiliary region to said cathode contact; and a radiation generating device energizable to generate minority carriers in said substrate which act as a base drive to turn on said thyristor when appropriate bias voltages are applied to said anode and cathode contacts.

514913

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