Power supply for supplying AC output power

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dc.contributor.assigneeVirginia Tech Intellectual Properties, Inc.en
dc.contributor.assigneeMatsushita Electric Works, Ltd.en
dc.contributor.inventorMurakami, Yoshinobuen
dc.contributor.inventorLee, Fred C.en
dc.contributor.inventorMaehara, Minoruen
dc.contributor.inventorChen, Wei Hsiaoen
dc.contributor.inventorYamauchi, Tokushien
dc.contributor.inventorNishiura, Kojien
dc.date.accessed2016-08-19en
dc.date.accessioned2016-08-24T17:54:10Zen
dc.date.available2016-08-24T17:54:10Zen
dc.date.filed1996-02-09en
dc.date.issued2000-05-02en
dc.description.abstractHigh voltage stress on the semiconductor devices at light load conditions, high total harmonic distortion (THD) of the line current, and poor crest factor (CF) of lamp current of ''charge pump'' electronic ballast circuits make them difficult to manufacture cost-effectively. To overcome these deficiencies, the DC bus voltage is reduced at light loads by providing a second resonance. One technique, high-frequency second-stage resonance, provides sufficient preheating at low V.sub.dc. Combined with the instant startup and the proper restart scheme, this technique can greatly reduce the maximum V.sub.dc at ignition. Another technique, low-frequency second-stage resonance, can reduce the steady state V.sub.dc at light loads, including during start-up. Consequently, high ignition voltage can be continuously impressed on the lamp without increasing V.sub.dc. Further, a diode clamping technique smooths the envelope of V.sub.a, thereby achieving near unity power factor, low THD and low CF without close-loop control.en
dc.format.mimetypeapplication/pdfen
dc.identifier.applicationnumber8598872en
dc.identifier.patentnumber6057652en
dc.identifier.urihttp://hdl.handle.net/10919/72414en
dc.identifier.urlhttp://pimg-fpiw.uspto.gov/fdd/52/576/060/0.pdfen
dc.language.isoen_USen
dc.publisherUnited States Patent and Trademark Officeen
dc.subject.cpcH05B41/295en
dc.subject.cpcH05B41/28en
dc.subject.cpcH05B41/2983en
dc.subject.cpcY10S315/04en
dc.subject.uspc315/307en
dc.subject.uspcother315/219en
dc.subject.uspcother315/224en
dc.subject.uspcother315/DIG4en
dc.subject.uspcother363/37en
dc.titlePower supply for supplying AC output poweren
dc.typePatenten
dc.type.dcmitypeTexten
dc.type.patenttypeutilityen

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