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:
Jul. 13, 1999
Filed:
Apr. 07, 1997
Applicant:
Inventor:
Antonio Canova, Montevarchi, IT;
Assignee:
MagneTek, Inc., Nashville, TN (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H05B / ;
U.S. Cl.
CPC ...
315291 ; 315307 ; 315224 ; 315D / ;
Abstract
An electronic ballast is used for providing a voltage with a varying frequency to fluorescent lamps. The electronic ballast has an inverter to supply a fluorescent lamp load with a voltage having a high frequency, with the inverter being controlled by a control which generates a switching signal. The ballast further includes a triangular current wave generator which provides a triangular waveform that modulates the frequency of the switching signal controlling the inverter. The modulation of the switching signal causes the frequency of voltage supplied to the fluorescent lamp load to vary from the resonant frequency of the circuit.