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:
Oct. 07, 2008
Filed:
Sep. 29, 2006
Warren Paul Moskowitz, Ipswich, MA (US);
Warren Paul Moskowitz, Ipswich, MA (US);
Osram Sylvania Inc., Danvers, MA (US);
Abstract
A circuit () for powering a high intensity discharge lamp () comprises first and second input terminals (), first and second output terminal (), first and second inverter switches (SW,SW), a transformer (), first and second buck capacitors (C,C), first and second low-side capacitors (C,C), an ignitor (), and a diode subcircuit (). Transformer () includes a primary winding () and a secondary winding (). During operation of circuit, primary winding () functions as a buck inductor, while secondary winding () operates in conjunction with diode subcircuit () to provide enhanced low frequency open circuit voltage (OCV) during the lamp starting phase and during steady-state powering of the lamp (). Circuit () also allows for a lamp current having a non-zero average value. Circuit () is realizable with first and second low-side capacitors (C,C) having a relatively low capacitance value.