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. 25, 2014
Filed:
Jan. 19, 2007
Frederick Stevens, Spennymoor, GB;
Geoff Wallhead, Newton Aycliffe, GB;
Daniel Rohner, Vienna, AT;
Alexander Mair, Vienna, AT;
Frederick Stevens, Spennymoor, GB;
Geoff Wallhead, Newton Aycliffe, GB;
Daniel Rohner, Vienna, AT;
Alexander Mair, Vienna, AT;
Tridonic Atco GmbH & Co. KG, Dornbirn, AT;
Abstract
An emergency-lighting device for operating a light-source, in particular an LED, comprises an energy storage unit, a charging circuit, to be supplied with a mains supply voltage (U), for charging the energy storage unit during charging operation, the charging circuit comprising a potential separation, and also a driver circuit, supplied by the energy storage unit during emergency-light operation, for operating the light-source. Furthermore a control unit is provided which is designed for monitoring the state of the mains supply voltage (U) during charging operation and, when an emergency condition is detected, for activating emergency-light operation, the control unit ascertaining the state of the mains supply voltage (U) on the basis of operating variables of the emergency-lighting device which are measured on the output side of the charging circuit.