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. 18, 2003
Filed:
Oct. 23, 2001
Canh Cong Duong, Salem, MA (US);
Ronald Fiorello, Tewksbury, MA (US);
Orsam Sylvania Inc., Danvers, MA (US);
Abstract
A method and apparatus for controlling a lamp ballast having a DC-DC converter with first and second MOSFETs acting as switches alternately connecting a DC power source to a power transformer, with an output of the power transformer being connected to a DC-AC inverter driving the lamp. The first and second MOSFETs in the DC-DC converter are alternately opened and closed at a frequency that is swept repeatedly between predetermined minimum and maximum frequencies. A microcontroller-based feedback element determines instantaneous power consumption by the lamp and controls the MOSFETs through a pulse width modulator to continuously adjust a duty cycle of signals driving gates of the MOSFETs to maintain a desired level of power consumption.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile