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:
Jul. 23, 1985
Filed:
Nov. 02, 1983
Applicant:
Inventor:
Noriyuki Yamada, Tokyo, JP;
Assignee:
Motorola, Inc., Schaumburg, IL (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02H / ;
U.S. Cl.
CPC ...
361 86 ; 361 18 ;
Abstract
A protective power foldback circuit which protects a power semiconductor device from damage resulting from variations in load, supply voltage, and input drive power is disclosed. When the supply voltage exceeds a certain value, the drive power to the power device is reduced in an amount greater than that produced by the excess supply voltage thereby protecting the power device from the combined effects of load, supply voltage, and drive power.