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:
May. 15, 2007
Filed:
Jul. 01, 2003
Dolf Henricus Jozef Van Casteren, Eindhoven, NL;
Dolf Henricus Jozef Van Casteren, Eindhoven, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
Driver () for a gas discharge lamp () comprises: an arrangement of two MOSFET switches () connected in series between two input terminals (); an inductor () connected in series with said lamp (), this series arrangement being coupled to a node (P) between said two switches; a control unit () providing control signals (S, S) to said two switches. During a first commutation interval (), a lamp circuit current (ILC) has only a first direction while during a second commutation interval () said lamp circuit current has only an opposite direction. In each commutation interval (), during a first operational phase () said lamp circuit current has a continuously increasing level while during a second operational phase () said lamp circuit current has a continuously decreasing level. The control unit () is designed to generate its control signals (S, S) such that said two switches are always, switched substantially simultaneously in counter-phase. The mosfets are used in reverse conduction m node also, to avoid body diode conduction (synchronous rectification).