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:
May. 25, 1982
Filed:
Mar. 19, 1980
Applicant:
Inventor:
Per Svedberg, Vallingby, SE;
Assignee:
ASEA Aktiebolag, Vesteras, SE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K / ;
U.S. Cl.
CPC ...
3072 / ; 3072 / ; 307305 ; 357 23 ; 357 38 ; 357 39 ; 361 91 ;
Abstract
A two-pole overcurrent protection device, intended for connection into a current-carrying conductor, comprises a normally conducting thyristor having members for firing the thyristor at low off-state voltage. The thyristor has a member for turning off the thyristor by short-circuiting one of its injecting junctions. Voltage-sensing members sense the on-state voltage drop across the thyristor and influence the short-circuiting member for turning off the thyristor when the on-state voltage drop reaches a pre-determined level. The overcurrent protection device may be constructed integrally with one single semiconductor plate.