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:
Feb. 07, 1995
Filed:
Jun. 14, 1993
Applicant:
Inventor:
John M Wong, Buffalo Grove, IL (US);
Assignee:
Philips Electronics North America Corporation, New York, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B / ; H05B / ;
U.S. Cl.
CPC ...
315224 ; 315205 ; 3152 / ; 3152 / ; 315247 ; 315307 ; 315D / ;
Abstract
A fluorescent lamp ballast having improved power factor by providing high frequency signals fed back to the a.c. side of the ballast rectifier. The feedback signal is regulated by limiting or reducing the voltage gain of the feedback signal based on the level of the unregulated feedback signal or rectified signal, respectively.