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:
Mar. 28, 2000
Filed:
Feb. 26, 1998
Lawrence Dean Hazelton, Goodrich, MI (US);
Lance Ronald Strayer, Waterford, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A circuit having reverse battery protection includes a combination of an electrical load and an N-channel MOSFET inversely coupled in series with the load. The gate of the MOSFET is coupled to the high potential side of the electrical load. The series combination is powered by a DC voltage source. Positive polarity voltages enhance the MOSFET and provide for low loss conduction thus completing the series circuit whereas negative polarity voltages bias the MOSFET off thus providing a DC block by way of the intrinsic diode of the inversely coupled MOSFET. Gate to source voltage may be limited or controlled to prevent damage due to punch through effects at high positive voltages and to ensure turn-off of the MOSFET at negative polarity voltages.