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:
Feb. 13, 2001
Filed:
Oct. 22, 1999
Etienne N. K. P. M. Eberson, Eindhoven, NL;
Antonius A. M. Marinus, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A ballast circuit for a compact fluorescent lamp includes a down-converter for operating the lamp with a DC current during stationary operation. First and second input terminals provide a DC supply voltage and first and second output terminals connect to the lamp. The down-converter has a first switch and a diode serially connected to the input terminals and an inductor coupled to the first switch and to one output terminal. A second switch is coupled to the output terminal. A control circuit operates the first switch at a high frequency. During the preheating and ignition phase, the down-converter is operated in the continuous mode and during stationary operation in the discontinuous mode by control of the switching frequency of the first switch.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile