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. 09, 2013
Filed:
Nov. 28, 2007
Anton Werner Keller, Arni, CH;
Anton Werner Keller, Arni, CH;
Thomson Licensing, Boulogne-Billancourt, FR;
Abstract
A switching 'power () includes a single, power switching Metal-Oxide-Semiconductor Field Effect Transistor (MOSFET) (Q) that without any additional transistor provides both self-oscillation and over-current protection. A transformer (Tr) that is included in a positive feedback path of the MOSFET has a tapped (intermediate terminal) auto-transformer winding. A source terminal () of the MOSFET is coupled via a current limiting resistor (R) to a junction terminal between first (n)and second (n) windings of the tapped auto-transformer (Tr). The first winding forms the primary winding of the transformer and the second winding is coupled to a gate terminal of the MOSFET to form a regenerative feedback path. The second winding is direct-current (DC) coupled to the gate terminal to avoid the need for any discrete capacitor in the positive feedback path.