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:
Nov. 25, 2008
Filed:
Jun. 03, 2004
Xiaohong Sun, Briarcliff Manor, NY (US);
Demetri J. Giannopoulos, Norwalk, CT (US);
Laurence Bourdillon, New Milford, CT (US);
Xiaohong Sun, Briarcliff Manor, NY (US);
Demetri J. Giannopoulos, Norwalk, CT (US);
Laurence Bourdillon, New Milford, CT (US);
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A method of operating a light source () including a ballast () in electrical communication with a lamp (). The method includes operating the ballast () to determine () an average lamp power to be applied to the lamp () during a data period. The method further includes operating the ballast () to generate and communicate () a pulse width modulated drive signal to the lamp () during the data period, the pulse width modulated drive signal having one of a first waveform and a second waveform for applying the average lamp power to the lamp (), the first waveform including at least one pulse representative of a first data bit, the second waveform including at least one pulse representative of a second data bit. The method additionally includes operating the lamp () to emit () a modulated light output in response to a reception of the pulse width modulated drive signal during the data period, the modulated light output being representative of the first data bit in response to the pulse width modulated drive signal having the first waveform, the modulated light output being representative of the second data bit in response to the pulse width modulated drive signal having the second waveform.