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ElectricalMeasurement&Instrumentation50575201311Vol.50No.575Nov.20130PC817ATL431、。[1]。52W、100kHz、PC817ATL431。1[2]。。1PC817、TL431PWMTOP227。TL431APC817。TL431A、PIPC817TOP227PWM。150080。。。。TM91B1001-1390201311-0102-04CompensationLoopDesignofSwitchPowerSupplywithCurrentFlybackTypeGAOHan-ying,SHENJuan,XINGZheng-feiZHOUShiSchoolofElectric&ElectronicEngineering,HarbinUniversityofScienceTechnology,Harbin150040,ChinaAbstractControlmodeofthepeakcurrentisoneofthemostpopulartopologiesindesignoftheflybackswitchingpowersupply,whichiseasiertocompensatecomparingwiththevoltage-controlmode.Butthenegativefeedbackcompensationisthekeytodesigntheswitchingpowersupply.Atpresent,loopcompensationmodeisdesignedtoadapttomutationintheloadandgrid.Thispapertakesloopcompensationdesignwithathree-wayoutputasanexample,andcarriesoutadetailedanalysis.Simultaneously,thepaperalsocalculatesthecomponentparametersontheloopcompensation,andbuildsthehardwarecircuit.Theexperimentsshowthatthedesignisofbetterversatilityandmeetstherequirementsofthedesign.KeywordsflybackSMPS,loopdesign,dynamiccompensation,phaseallowance1PC817ATL431Fig.1LoopconstitutedwithPC817AandTL431102--ElectricalMeasurement&Instrumentation50575201311Vol.50No.575Nov.201321360°。360°。35°45°3-4。。1TL431C20、C21、R5。32a、bc。2aESR。2b1。。2c、1。。-40dB/10-20dB/10-20dB/10。10db2-20dB/10345°。3。43185~265VACV1=15VI1=2AV2=5VI2=2AV3=24VI3=0.5A。V11500μF。Vmin=185×1.3=240VVmax=265×1.414=375V130VVmin×DmaxNp=Vout×1-DmaxNS1Vmin×Dmax1-Dmax=Vout×NpNS=V2Dmax=0.35。4.1AP[5]Ap=Ae×Aw=PT×1062ηfsΔBδKmKC3Aecm2Aw2Fig.2Currentcontrollerandbodeplotabc3Fig.3Systemgainandphaseresponsecurvesaftercompensation103--ElectricalMeasurement&Instrumentation50575201311Vol.50No.575Nov.2013cm2PTW15×2+5×2+24×0.5=52Wη0.85fs100kHzΔB0.25Tδ5A/mm2Km0.2KC1.0。3AP=0.203cm4ETD28AP=1.0687cm4AP::Ip=2PTη×Vmin×Dmax=0.76ALp=Vmin×DmaxIp×fS=1.14mHNp=Lp×IpAe×ΔB=56T15VN15=Np×V15+Vd1-DmaxVmin×Dmax=4.6T55VN5=N15×V5+VdV15+Vd=2T24VN24=N15×V24+VdV15+Vd=8T12VN12=N15×V12+VdV15+Vd=4T。4.24.2.1Gdc=Vin1－D2×NSNp=73=37dBL=Ls1－D2=0.024(mH)f2p=12πLC%姨=0.72kHzESR5kHz。4.2.24TOP227[6]。ZTOP22715ΩR、C7Ω47μFTOP227PWM16020log160=44dBfZ=12πRC=483Hzfp1=12πR+ZC=154HzTOP227fp2=7kHz。4.2.3[7]TL431PC8175。ΔiRbΔV0=ΔV0－ΔVerrRb×ΔV0=1+GRb。ΔiRbΔV0ω0Gω0Rb。R3R1×Rb。fx0=14kHzLC:12πR3C3=12πR1C2=720Hz4fx0=14kHz34.6－40log14k7k=22.6dB。0dB-22.4dB:20logR3R1×Rb+20log14k0.72k=－22.6dB5100Hz100Hz。+1。+1。。4Fig.4Consoleequivalentmodel5Fig.5ApplicationcircuitoftypeIIIerroramplifier104--ElectricalMeasurement&Instrumentation50575201311Vol.50No.575Nov.2013f2P12πR3C1=12πR2C2=f2P6f2Ptan－114k154－tan－114k483－tan－114k5k+tan－114k7k+90°=84°45°2tan－114kf2P=180°－45°－84°=51°7R30=2kΩ2.5V2kΩ=1.25mA。R31=V0－VREFVREF×R30=15－2.52.5×2=10kΩ84~8Rb=380R32=200ΩR33=16kΩC10=310pFC20=2.2×104pFC30=1.2×104pF。5624V715V85V200mV1%。95V。624VFig.6Voltagewaveformof24Voutput715VFig.7Voltagewaveformof15Voutput95VFig.9Voltageinstantaneouswaveformof5Voutput85VFig.8Voltagewaveformof5Voutput6PC817ATL431。。[1].[M].:,2004.1.[2]OnSemiconductorSwitchModePowerSupplies.Refere-nceManualandDesignGuide1999.[3].[M].:,1999.3.[4]C.Basso.TransientResponseCountsWhenChoosingPhaseMargin[J].PowerElectronicsandTechnology,November2008.[5]R.KollmanandJ.Betten.ClosingtheloopwithaPopularShuntRegulator[J].PowerElectronicsTechnology,September2003,PP,30-36.[6]C.Basso.SwitchModePowerSupplies:SPICESimulationsandPracticalDesigns[Z].McGraw-Hill,2008.[7]PIDatasheet:TOP221-227[Z].1969—。Emailghyljt@sina.com1985—。2013-02-082013-05-08105--