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:
May. 14, 2002
Filed:
Mar. 20, 2001
Applicant:
Inventors:
Qiong Li, Cortlandt Manor, NY (US);
Ihor Wacyk, Briarcliff Manor, NY (US);
Assignee:
Koninklijke Philips Electronics N.V., New York, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G05F 1/00 ;
U.S. Cl.
CPC ...
G05F 1/00 ;
Abstract
A ballast system in which mixed-mode gate signals are used to control the ballast circuit so as to produce a more straight ballast lines such than only a single solution exists between ballast lines and lamp lines over the whole operating range, whereby a stable of lamp performance is achieved. In a preferred embodiment, symmetric and asymmetric modes are arranged alternatively in every other switching cycle to produce mixed-mode PWM gate signals.