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SOLID STATE LIGHT SOURCE DRIVER ESTABLISHING BUCK OR BOOST OPERATION

United States Patent Application

20140091724
A1
View the Complete Application at the US Patent & Trademark Office
A solid state light source driver circuit that operates in either a buck convertor or a boost convertor configuration is provided. The driver circuit includes a controller, a boost switch circuit and a buck switch circuit, each coupled to the controller, and a feedback circuit, coupled to the light source. The feedback circuit provides feedback to the controller, representing a DC output of the driver circuit. The controller controls the boost switch circuit and the buck switch circuit in response to the feedback signal, to regulate current to the light source. The controller places the driver circuit in its boost converter configuration when the DC output is less than a rectified AC voltage coupled to the driver circuit at an input node. The controller places the driver circuit in its buck converter configuration when the DC output is greater than the rectified AC voltage at the input node.
Palmer, Fred (Danvers, MA)
OSRAM SYLVANIA INC. (Danvers MA)
13/ 629,710
September 28, 2012
STATEMENT OF GOVERNMENT INTEREST [0001] This invention was made with U.S. Government support under DOE Cooperative Agreement No. DE-EE0000611, awarded by the U.S. Department of Energy. The U.S. Government may have certain rights in this invention.