Current sensing in multiple coupled inductors by time constant matching to leakage inductance

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dc.contributor.assigneeVirginia Tech Intellectual Properties, Inc.en
dc.contributor.inventorLee, Fred C.en
dc.contributor.inventorXu, Ming Gangen
dc.contributor.inventorDong, Yanen
dc.date.accessed2016-08-19en
dc.date.accessioned2016-08-24T17:54:41Zen
dc.date.available2016-08-24T17:54:41Zen
dc.date.filed2006-01-30en
dc.date.issued2007-06-19en
dc.description.abstractVoltage regulators often have coupled output inductors because coupled output inductors provide improvements in cost and efficiency. Coupled inductors are often used in multi-phase voltage regulators. Feedback control of voltage regulators often requires accurate and responsive sensing of output current. Provided is a technique for accurately sensing the magnitude of output current in coupled inductors. An RC circuit (comprising a resistor and capacitor in series) is connected in parallel with the coupled inductor. The inductor has a leakage inductance Lk and a DC (ohmic) resistance of DCR. The resistor and capacitor are selected such that an RC time constant is equal to an L/R time constant of Lk/DCR. With the matching time constants, a sum of voltages on the capacitors is accurately proportional to a sum of currents flowing in the output inductors. Also provided is a technique for sensing current when an uncoupled center tap inductor is present.en
dc.format.mimetypeapplication/pdfen
dc.identifier.applicationnumber11341874en
dc.identifier.patentnumber7233132en
dc.identifier.urihttp://hdl.handle.net/10919/72562en
dc.identifier.urlhttp://pimg-fpiw.uspto.gov/fdd/32/331/072/0.pdfen
dc.language.isoen_USen
dc.publisherUnited States Patent and Trademark Officeen
dc.subject.cpcH02M3/1584en
dc.subject.cpcH02M2001/0009en
dc.subject.uspc323/272en
dc.subject.uspcother323/290en
dc.titleCurrent sensing in multiple coupled inductors by time constant matching to leakage inductanceen
dc.typePatenten
dc.type.dcmitypeTexten
dc.type.patenttypeutilityen

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