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:
Sep. 16, 2014
Filed:
Jun. 12, 2008
Wei Gao, Guangzhou, CN;
Markus Heckmann, München, DE;
Rene Twardzik, Traunreut, DE;
Yanshun Xue, Guangzhou, CN;
Wei Gao, Guangzhou, CN;
Markus Heckmann, München, DE;
Rene Twardzik, Traunreut, DE;
Yanshun Xue, Guangzhou, CN;
Osram Gesellschaft mit beschraenkter Haftung, Munich, DE;
Abstract
A detect method is provided for performing step dimming selection in an electronic ballast including an End of Lamp Life detect circuit and a half-bridge inverter, the End of Lamp Life detect circuit being connected to an input terminal of the control circuit, wherein each time when the power switch is turned on, it is judged whether the electronic ballast should enter the dimming mode or not by detecting the voltage at the input terminal of the control circuit before the half-bridge inverter starts operating.