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. 18, 2003
Filed:
Mar. 29, 2001
Vincent James Delia, Chicago, IL (US);
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
Ballast circuitry is provided for powering a gaseous discharge lamp which has a range of possible parasitic loading capacitances associated with it. The circuitry includes a reactive source of ignition pulses which stores sufficient energy to charge the highest value of parasitic loading capacitance in the range to at least the minimum ignition voltage of the lamp. A voltage clamping element limits the peak voltage of the ignition pulses, even at the lowest value of parasitic loading capacitance in the range, to a maximum permissible voltage that may be applied to the lamp. The reactive source and the voltage clamping element cooperate to automatically provide high-energy ignition pulses to the lamp, with peak voltages well within permissible limits, over the entire range of parasitic loading capacitances.