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:
Aug. 14, 2012
Filed:
Feb. 04, 2011
Warren Moskowitz, Ipswich, MA (US);
Joachim Muehlschlegel, Grobenzell, DE;
Warren Moskowitz, Ipswich, MA (US);
Joachim Muehlschlegel, Grobenzell, DE;
OSRAM SYLVANIA Inc., Danvers, MA (US);
Abstract
An electronic control gear for a HID lamp receives an input signal for operating the lamp and frequency modulates the input signal to generate a frequency modulated output signal that drives an arc of the lamp. The frequency modulation of the output signal sweeps continuously between a low frequency modulation and a high frequency modulation, the low frequency modulation being a frequency fin a range of 125 kHz to 150 kHz and the high frequency modulation being a frequency fin a range of 230 kHz to 300 kHz, where ffis at least 0.4*f. A power amplifier changes an amplitude of the frequency modulated output signal during the low frequency modulations so that a current amplitude of the frequency modulated output signal is substantially constant, and a variable gain transformer adjusts a voltage of the frequency modulated output signal during starting of the lamp.