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. 16, 2014
Filed:
Jun. 30, 2012
Nitin Kumar, Burlington, MA (US);
Markus Ziegler, Watertown, MA (US);
Robert Martin, Nicholasville, KY (US);
Shashank Bakre, Woburn, MA (US);
Nitin Kumar, Burlington, MA (US);
Markus Ziegler, Watertown, MA (US);
Robert Martin, Nicholasville, KY (US);
Shashank Bakre, Woburn, MA (US);
OSRAM SYLVANIA Inc., Danvers, MA (US);
Abstract
A ballast for energizing a lamp at a lighting level selected from a plurality of lamp lighting levels. The ballast includes a buck converter circuit configured to receive a DC voltage signal having a substantially constant magnitude. The buck converter circuit has a duty cycle for generating a lamp voltage output signal from the DC voltage signal. The lamp voltage output signal has a magnitude that is varied by the duty cycle to energize the lamp at the plurality of lamp lighting levels. A controller is configured to receive a dim input signal indicative of the selected lamp lighting level and to provide a control signal to the buck converter circuit as a function of the dim input signal. The control signal indicates a particular duty cycle corresponding to a lamp voltage output signal having a magnitude for energizing the lamp at the selected lamp lighting level.