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:
Apr. 08, 1986
Filed:
Jul. 05, 1984
Applicant:
Inventor:
Ciro Guajardo, Harbor City, CA (US);
Assignee:
Teledyne Industries, Inc., Los Angeles, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02H / ;
U.S. Cl.
CPC ...
307117 ; 307584 ; 361 93 ; 361 98 ; 361100 ;
Abstract
A control circuit for protecting a metal oxide semiconductor field-effect power transistor from current overloads is disclosed in one embodiment of the control circuit. A silicon controlled rectifier is used to remove the bias voltage from the MOSFET in the event of a current overload. In another embodiment of the invention a bipolar transistor in combination with a second MOSFET is used to turn off the power MOSFET in the event of a current overload. The voltage appearing across the power MOSFET is used as an indication of a current overload condition.