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:
Sep. 17, 2002
Filed:
Feb. 12, 1999
Russell L. MacAdam, Coopersburg, PA (US);
Mark S. Taipale, Harleysville, PA (US);
Oliver K. Mihm, Raleigh, NC (US);
David G. Luchaco, Fogelsville, PA (US);
Jason C. Killo, Emmaus, PA (US);
Kolawole A. Otitoju, Allentown, PA (US);
Lutron Electronics Co., Inc., Coopersburg, PA (US);
Abstract
An electronic dimming ballast has a parallel loaded resonant output circuit plus a combination of pulse width modulation and frequency variation to accomplish the dimming of compact fluorescent lamps. The ballast operates at a fixed frequency throughout a selected range of light levels, with dimming control being done completely by duty cycle variation over this range of operation, and then smoothly moves to a variable frequency as the light output moves outside the selected range, with both duty cycle and frequency variation being the means of lamp light output control outside the selected range.