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. 16, 2013
Filed:
May. 04, 2010
Timothy Chen, Aurora, OH (US);
James Kevin Skully, Willoughby, OH (US);
Timothy Chen, Aurora, OH (US);
James Kevin Skully, Willoughby, OH (US);
Other;
Abstract
In one embodiment, a self-oscillating electronic ballast for discharge tube type lamps which increases efficiency and has IEC-standard end of lamp life protection. Efficiency is enhanced by placing primary resonant capacitor () in parallel with cathode conduction loop () while retaining a minimal secondary resonant capacitor () within the cathode conduction loop (). IEC-standard end of lamp life protection is achieved by placing the primary winding () of the base drive transformer () within the cathode conduction loop () of the ballast circuit, and employing a dampening capacitor () to suppress the erroneous base drive signals generated by coupling in the secondary windings () as a lamp nears end of lamp life. Other embodiments are described and shown.