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. 20, 2007
Filed:
Sep. 28, 2004
Gerrit Hendrik Van Eerden, Aalten, NL;
Gerrit Hendrik van Eerden, Aalten, NL;
N.V. Nederlandsche Apparatenfabriek NEDAP, Groenlo, NL;
Abstract
An input dc-voltage, usually obtained from an AC-mains voltage through a pre-connected rectifier and Power Factor Corrector, is converted by a series connection of two power transistors to an ac-voltage, which, via an LC section is presented to a gas discharge lamp. For starting the lamp, the power transistors are switched with a frequency which is slightly higher than approximately one-third or one-fifth of the resonance frequency of the LC section. Circuits have been provided for limiting the output voltage, for limiting the lamp current and for stabilizing the lamp output. Safety circuits switch the power circuit off if the lamp does not ignite or if the lamp exhibits rectifying effect.