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. 22, 2008
Filed:
Oct. 21, 2005
Andrew O. Johnsen, Danvers, MA (US);
Bernhard Ertl, Munich, DE;
Gerwin Thiel, Munich, DE;
John Cross, Needham, MA (US);
Andrew O. Johnsen, Danvers, MA (US);
Bernhard Ertl, Munich, DE;
Gerwin Thiel, Munich, DE;
John Cross, Needham, MA (US);
Osram Sylvania Inc., Danvers, MA (US);
Abstract
A ballast () for powering at least one gas discharge lamp () comprises a switching converter () and an inverter (). Switching converter () includes a transistor () and a control circuit () that provides substantially zero voltage switching of the transistor () at a very high frequency. Preferably, control circuit () includes a drive circuit (), a turn-on synchronization circuit (), a current mirror circuit (), a rail voltage regulator circuit (600), and a lamp current regulator circuit (). Drive circuit () is preferably realized by a circuit arrangement that includes a standard pulse-width modulation integrated circuit ().