Design and Implementation of an Isolated Interleaved Buck Boost Converter with Phase Shifted Control

Abstract

tThis tpaper tfocuses ton tdeveloping ta tnovel method tfor tthe tdesign tof tdiscrete tbuck tbooster tconverter with tsingle tphase tpower tconsumption. tIn tthis tmethod, tit uses tconverters tbased ton thigh tfrequency tfrequency bridge-less tinterlaced twidth trectifiers. tThe tmerit tof tthis method tis tthat tby tincorporating tinterleaved tboost converters tinto tcomplete tbridge tdiode trectifiers, tswitching and tconduction tlosses tcan tbe tsignificantly treduced. tHere, we tanalyze tthe twhole tbridge tin tdetail twith tthe tdiscrete buck-booster tconverter tvoltage tcoefficient. tVoltage coefficient tcorrection thelps tincrease tthe tvoltage tgain tin tthe circuit. tWe tuse tan toptimized tphase tshift tmodulation strategy ton ta tcomplete tbridge tdiscrete tbuck tboost converter tfor timproved tperformance tand tincrease toverall efficiency. tTransformers twith tlow tratios tand tlow tvoltage MOSFETs tand tdiodes tcan tbe timplemented tto timprove efficiency. tBased ton ta tvariety tof tinterlaced tbooster converters, tincluding ttraditional tbooster tconverters tand high tstep-up tbooster tconverters twith tvoltage tmultipliers. From tthe tpoint tof tview tof tconversion tefficiency, tthe discrete tbuck-boost t(IBB) tconverter tis ta tgood tapproach. Unfortunately, tthe tfly-back tconverter tis ta ttypical tIBB converter, tbut tthe tefficiency tis tstill tvery tlow tdue tto tthe high tvoltage tpressure ton tthe tcomponents tand trectangles. In this tpaper twe tgive tan tinput tDC tsupply tof t12V tand tan output tvoltage tof t140V. tThe toutput tprototype twas designed tto tvalidate tthe teffectiveness tof tthe tproposed tIBB converters tand tits tcontrol tstrategies.