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. 08, 2015
Filed:
Jun. 30, 2010
Yuhong Fang, Naperville, IL (US);
Sree Venkit, Naperville, IL (US);
Sanjaya Kumar Pradhan, Des Plaines, IL (US);
Alejandro Lopez, Lake Zurich, IL (US);
George Grouev, Lake Zurich, IL (US);
Arun Ganesh, Aurora, IL (US);
Bruce Rhodes, Inverness, IL (US);
Yuhong Fang, Naperville, IL (US);
Sree Venkit, Naperville, IL (US);
Sanjaya Kumar Pradhan, Des Plaines, IL (US);
Alejandro Lopez, Lake Zurich, IL (US);
George Grouev, Lake Zurich, IL (US);
Arun Ganesh, Aurora, IL (US);
Bruce Rhodes, Inverness, IL (US);
KONINKLIJKE PHILIP N.V., Eindhoven, NL;
Abstract
An electronic ballast and startup method including an electronic ballast operably connected to a lamp having a lamp filament, the electronic ballast having a timer () generating an inverter control signal () and a preheat control signal (); a converter () receiving AC power and generating DC power (); a self-oscillating inverter () receiving DC power () and being operable to provide lamp power () to the lamp, the self-oscillating inverter () being responsive to the inverter control signal (); and a filament preheater () receiving DC power () and being operable to provide filament power () to the lamp filament, the filament preheater () being responsive to the preheat control signal (). When AC power is initially applied, preheat control signal () directs the filament preheater () to provide filament power (), and inverter control signal () directs the self-oscillating inverter () not to provide lamp power ().