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Title: Solid state light source driver establishing buck or boost operation

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.
Inventors:
Issue Date:
OSTI Identifier:
1377822
Assignee:
OSRAM SYLVANIA Inc. DOEEE
Patent Number(s):
9,748,858
Application Number:
13/629,710
Contract Number:
EE0000611
Resource Relation:
Patent File Date: 2012 Sep 28
Research Org:
OSRAM SYLVANIA Inc. Wilmington, MA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 24 POWER TRANSMISSION AND DISTRIBUTION

Works referenced in this record:

Electronic ballast
patent-application, January 2003