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:
Dec. 09, 2003
Filed:
Apr. 03, 2002
Sri Sridharan, Hickory Hills, IL (US);
Radionic Industries, Inc., Chicago, IL (US);
Abstract
A ballast system for use with a fluorescent lamp having two filaments disposed at opposite ends of the lamp. The ballast system has a DC input terminal for connection to a DC voltage source or for receiving a rectified DC signal. The ballast system also includes a capacitor operably connected between the DC input terminal and the lamp and an inductor, wherein the lamp operably connects the capacitor in series with the inductor. The ballast system further includes a first power transistor operably connected to a junction joining the DC input terminal to the capacitor and a second power transistor operably connected to drive the first power transistor. The emitter of the first power transistor and the collector of the second power transistor are operably connected to the inductor such that the two power transistors sense a change in voltage across the inductor and control current from the DC voltage source to the capacitor in response to a change in voltage across the inductor.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile