Adaptive on-time control for power factor correction stage light load efficiency

dc.contributor.assigneeVirginia Tech Intellectual Properties, Inc.en
dc.contributor.inventorLee, Fred C.en
dc.contributor.inventorWang, Chung-Hsing Hsuanen
dc.contributor.inventorXu, Ming Gangen
dc.contributor.inventorLi, Qianen
dc.date.accessed2016-08-19en
dc.date.accessioned2016-08-24T17:55:17Zen
dc.date.available2016-08-24T17:55:17Zen
dc.date.filed2011-07-18en
dc.date.issued2014-08-12en
dc.description.abstractLight load efficiency of a power factor correction circuit is improved by adaptive on-time control and providing for selection between a continuous conduction mode and a discontinuous conduction mode wherein the discontinuous conduction mode increases time between switching pulses controlling connection of a cyclically varying voltage to a filter/inductor that delivers a desired DC voltage and thus can greatly reduce the switching frequency at light loads where switching frequency related losses dominate efficiency. The mode for controlling switching is preferably selected for each switching pulse within a half cycle of the cyclically varying input voltage. A multi-phase embodiment allows cancellation of EMI noise at harmonics of the switching frequency and adaptive change of phase angle allows for cancellation of dominant higher order harmonics as switching frequency is reduced.en
dc.format.mimetypeapplication/pdfen
dc.identifier.applicationnumber13184788en
dc.identifier.patentnumber8803489en
dc.identifier.urihttp://hdl.handle.net/10919/72724en
dc.identifier.urlhttp://pimg-fpiw.uspto.gov/fdd/89/034/088/0.pdfen
dc.language.isoen_USen
dc.publisherUnited States Patent and Trademark Officeen
dc.subject.cpcH02M1/4216en
dc.subject.cpcH02M1/4225en
dc.subject.cpcH02M2001/0032en
dc.subject.cpcY02B70/126en
dc.subject.cpcY02B70/16en
dc.subject.uspc323/207en
dc.subject.uspcother323/272en
dc.subject.uspcother323/283en
dc.subject.uspcother363/89en
dc.titleAdaptive on-time control for power factor correction stage light load efficiencyen
dc.typePatenten
dc.type.dcmitypeTexten
dc.type.patenttypeutilityen
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