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:
Dec. 10, 1991
Filed:
Jul. 10, 1990
Applicant:
Inventors:
Josef-Matthias Gantioler, 8000 Muenchen 70, DE;
Jenoe Tihanyi, 8000 Muenchen 70, DE;
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K / ; H03K / ;
U.S. Cl.
CPC ...
307643 ; 307305 ; 307311 ; 307647 ; 307354 ;
Abstract
A thyristor is controlled by a phototransistor whose photo current is reduced by a MOSFET if the thyristor voltage surpasses a prescribed value. The MOSFET is controlled by two current supplies. The first current supply is connected between a gate terminal and a connecting terminal of the thyristor. The second current supply is connected between the gate and source of the MOSFET. The maximum current capacity of the first current supply is greater than the maximum current capacity of the second current supply.