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. 11, 1992
Filed:
Feb. 27, 1991
Sampat Shekhawat, Red Bank, NJ (US);
Allied-Signal Inc., Morris Township, Morris County, NJ (US);
Abstract
A proportional base drive circuit for a power transistor. A first MOSFET, when enabled by an ON pulse, initially supplies the base drive current from a power supply to the base of the power transistor. The resulting current flow through the transistor to a load causes a proportional current to be induced in a current transformer. The induced current is supplied to the base of the power transistor through the first MOSFET. When an OFF pulse is applied, the first MOSFET is disabled and supplies no current to the base of the transistor. At the same time a second MOSFET causes the base-emitter junction of the power transistor to be negatively biased, thereby quickly switching the power transistor off.