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:
Apr. 22, 2003
Filed:
Sep. 28, 2001
Himamshu V. Prasad, Rolling Meadows, IL (US);
Young G. Kang, Vernon Hills, IL (US);
John G. Konopka, Deer Park, IL (US);
Warren Moscowitz, Ipswich, MA (US);
Osram Sylvania Inc., Danvers, MA (US);
Abstract
A circuit for controlling current during run-up of a high pressure discharge lamp ( ) comprises a buck converter ( ) for generating a buck current to drive the high pressure discharge lamp and a control circuit ( ) coupled to the buck converter ( ) for varying the duty cycle of the buck current during run-up is disclosed. A method for controlling current in an electronic ballast during run-up of a high pressure discharge lamp comprises steps of detecting ( ) lamp ignition, providing ( ) a buck current to drive the lamp, and varying ( ) the duty cycle of the buck current during run-up to control ( ) the current in the lamp is also disclosed.