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dc.date.accessioned2016-08-24T17:55:25Zen
dc.date.available2016-08-24T17:55:25Zen
dc.date.issued2015-04-07en
dc.identifier.urihttp://hdl.handle.net/10919/72754en
dc.description.abstractA multi-channel constant current source particularly suitable for driving an array of light-emitting diodes as an illumination apparatus provides a power source stage voltage regulator for providing a variable voltage using pulse width modulation as an input to a plurality of constant current driver channels to regulate the constant current provided. Pulse width modulation thus allows both the power source stage and the constant current driver operating frequencies to be decoupled and individually optimized to maintain efficiency while emulating dimming effects of, for example, incandescent bulbs, over a full range of light output flux. Pulse width modulation can also be employed in the constant current channel drivers to avoid chromaticity shift during dimming.en
dc.format.mimetypeapplication/pdfen
dc.language.isoen_USen
dc.publisherUnited States Patent and Trademark Officeen
dc.titleMulti-channel two-stage controllable constant current source and illumination sourceen
dc.typePatenten
dc.identifier.urlhttp://pimg-fpiw.uspto.gov/fdd/73/006/090/0.pdfen
dc.date.accessed2016-08-19en
dc.type.dcmitypeTexten
dc.contributor.assigneeVirginia Tech Intellectual Properties, Inc.en
dc.contributor.inventorLee, Fred C.en
dc.contributor.inventorFeng, Weiyien
dc.date.filed2013-06-28en
dc.identifier.applicationnumber13930200en
dc.subject.uspc315/188en
dc.subject.uspcother315/186en
dc.subject.uspcother323/267en
dc.subject.cpcH02M3/335en
dc.subject.cpcH05B33/0839en
dc.subject.cpcH05B33/0815en
dc.subject.cpcH05B33/0851en
dc.subject.cpcY02B20/347en
dc.type.patenttypeutilityen
dc.identifier.patentnumber9000673en


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