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:
Aug. 12, 1986
Filed:
Apr. 12, 1984
Applicant:
Inventor:
Shinya Higashi, Tokyo, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02M / ;
U.S. Cl.
CPC ...
363 19 ; 363 97 ; 323289 ; 307289 ; 307315 ;
Abstract
A switching control circuit has a switching control transistor between a base current path of a switching power transistor and an emitter current limiting resistor. A collector current flows through the switching control transistor in the same direction as that of an emitter current flowing through the emitter current limiting resistor when the switching power transistor is held in an ON state. The direction of a current flowing through the emitter current limiting resistor does not change even if the switching control transistor is turned on so as to turn off the switching power transistor.