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:
Jan. 30, 2001
Filed:
Sep. 30, 1998
Frequency modulated ballast with loosely coupled transformer for parallel gas discharge lamp control
Applicant:
Inventor:
Hugh P. Adamson, Boulder, CO (US);
Assignee:
Power Circuit Innovations, Inc., Boulder, CO (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H05B 4/116 ;
U.S. Cl.
CPC ...
H05B 4/116 ;
Abstract
A frequency dependent controller utilizes a loosely coupled transformer, adapted to change the operating characteristics of the transformer by varying its operating frequency in accordance with the requirements of a load to be supplied with power. The controller is particularly adapted for dimming and adjustably controlling a set of gas discharge lamps such as fluorescent lamps, connected in parallel such that failure of one lamp does not affect operation of the other lamps in the set.