The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 25, 1986
Filed:
Oct. 24, 1984
Applicant:
Inventors:
Assignee:
Siemens Aktiengesellschaft, Berlin and Munich, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ; H03K / ; H03K / ;
U.S. Cl.
CPC ...
3072 / ; 3072 / ; 3072 / ; 307311 ; 307581 ;
Abstract
A circuit arrangement for drive of a thyristor with light comprises a zero pause control which permits an ignition of a thyristor only in a proximity of a zero point of the thyristor voltage. The control contains an IGFET which transports away a base current of the phototransistor effecting ignition when the thyristor voltage exceeds a specific value. The gate terminal of the IGFET connects to an alternating voltage via a photodiode. The zero point control can only be activated when the photodiode is illuminated.