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:
May. 06, 2014
Filed:
Apr. 11, 2007
Daniel Rohner, Vienna, AT;
Alexander Mair, Vienna, AT;
Daniel Rohner, Vienna, AT;
Alexander Mair, Vienna, AT;
Tridonicatco GmbH & Co KG, , AT;
Abstract
An emergency lighting device () for operating a light source, in particular an LED, incorporates an energy storage unit (), a charging circuit () to be supplied with mains supply voltage (U) for charging the energy storage unit () during a charging operation, wherein the charging circuit () has potential isolation, and a driver circuit () supplied by the energy storage unit () during operation of the emergency light, for operating the light source. A control unit () is further provided that is designed to monitor the state of the mains supply voltage (U) during the charging operation, and to activate emergency operation upon detecting an emergency state, wherein the control unit () determines the state of the mains supply voltage (U) from operating parameters of the emergency lighting device () measured on the output side of the charging circuit ().