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:
Mar. 16, 2004
Filed:
Sep. 30, 2002
Himamshu V. Prasad, Rolling Meadows, IL (US);
Osram Sylvania Inc., Danvers, MA (US);
Abstract
A dimming ballast ( ) for a high-intensity discharge lamp ( ) includes an ignitor ( ), a control circuit ( ), and a dimming interface ( ) for connection to an external dimming controller ( ). Following lamp replacement ( ), external dimming controller ( ) receives a user relamp command and, in response, sends a special relamp signal to dimming interface ( ). In response to the special relamp signal, dimming interface ( ) communicates with control circuit ( ), which directs ignitor ( ) to provide high voltage pulses for igniting the replaced lamp. In an alternative embodiment, an external control device such as a triac dimmer ( ) receives a user relamp command following lamp replacement and, in response, sends a special relamp signal to a control circuit ( ), which directs ignitor ( ) to provide high voltage pulses for igniting the replaced lamp.