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:
Nov. 19, 2013
Filed:
Oct. 17, 2008
Uwe Liess, Treviso, IT;
Uwe Liess, Treviso, IT;
OSRAM Gesellschaft mit beschraenkter Haftung, Munich, DE;
Abstract
An emergency supply circuit for an electronic ballast may include: an output line to feed a supply input of the ballast; a first line to receive a mains supply signal; a second line to receive an emergency supply signal from a battery, with a converter interposed in said second line to boost said supply signal, a switch to alternatively connect said output line to said first or said second line; a controller sensitive to the absence of said mains supply signal and to the charge level of said battery, said controller to produce switching of said switch to connect said output line to said second line in the absence of said mains supply signal on said first line, whereby said output line receives said supply signal, and dimming interface circuitry to drive said dimming control input of said ballast when said output line is connected to said second feed line.