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INPUTPARAMETERSECTIONOUTPUTSECTIONAmpOutputpower(輸出功率):65WattsIpp=Icp:2.015874595InputMinacvoltage(輸入電壓下限):96V(ac)修正Ipp=Icp:2.1InputMaxacvoltage(輸入電壓上限):240V(ac)Iprms=Icrms:0.826771654Ae(鐵芯有效截面積Sm):119mm2計算Ap=Aw*Ae:0.587589929CurrentDensity(電流密度J):4A/m㎡電流密度J可取3~5A/m㎡CoreMAXflaxBmax(最大磁通密度):1800Guss自然冷卻取1.5-4風扇冷卻取3-6MAXworkingduty(占空比):0.5Dmin(最小占空比):0.275362319FrequcncyMax(計算工作頻率):75.3926702KHzAp(鐵芯截面積乘積S):0.7188cm4計算鐵芯功率:100.05696(實際選)工作頻率:75KHzT周期(uS):13.33333333Outputdiode(輸出二极體正向壓降Vf):0.6V(dc)R.C.CF97.7547295CoreType(鐵芯型號):PQ26-20Np=40.14200961η(變壓器效率):0.9%KT(圈數Ns比Np):0.162432972初极每T平均電壓:8.48528137V(dc)KT1(圈數Np比Ns):6.260984315次极每T平均電壓:3.22440692V(dc)Outputvoltage(輸出電壓1,主回授):20V(dc)Ns1(次極圈數1):6.388771795F.BacktoICVoltage(IC回授電壓):15.6V(dc)Nvcc(回授圈數):5.024179761Outputvoltage(輸出電壓2):V(dc)Ns2(次極圈數2):0.186080732Outputvoltage(輸出電壓3):V(dc)Ns3(次極圈數3):0.186080732Outputvoltage(輸出電壓4):V(dc)Ns4(次極圈數4):0.186080732KL電感系數:0.42653538Ls1(次級線圈感量):15.3552738uHLs2(次級線圈感量):0uHLs3(次級線圈感量):0uHLs4(次級線圈感量):0uHLvcc(迴授線圈感量):10.6633846uHVs1VRup22.5624Rs0.397ΩRdown3.16Watts1.24WattsVref(TL431)2.5開關管選擇Vce(min)679V開關管選擇Ic(min)6ACin(輸入電容選擇):116uFCvcc(Vcc電容選擇):43uFCout1(輸出電容選擇):1167uF輸出二極體正向峰值電流IFminCout2(輸出電容選擇):Cout3(輸出電容選擇):Cout4(輸出電容選擇):輸出二極體反向電壓VFminDwp(計算初級線徑)Dws1(計算次級線徑)Dws2(計算次級線徑):Dws3(計算次級線徑):Dws4(計算次級線徑):Dwvcc(計算回授線徑):SingleStageFlaybackTransformerDesing一般講圈數比指Np比Ns計算銅線線徑版本:V1.2變壓器編號:日期:InputRipple:0VoltsKv(輸入電壓比值):2.63158Vin,min:128.976V(dc)1.119930331Vin,max:339.411V(dc)cm4lg(鐵芯氣隙長度):0.56494mmKu(繞組系數):0.27lg(修正):0.35059mm繞組系數取0.2~0.5Rt=1.91KCt=10000pFWattsTON導通時間(uS):6.66666667TOFF截止時間(uS):6.66667KHzTurn40Lp=426.535uH修正Lpmin=682.457uHTurn6輸出電流(A)3.5電容耐壓25Turn5輸出電流(A)0.1電容耐壓21Turn0輸出電流(A)3.5電容耐壓1Turn0輸出電流(A)2電容耐壓1Turn0輸出電流(A)1電容耐壓1計算銅線截面積計算銅線直徑(min)實用銅線0.165683359m㎡0.459957694mm0.5mm0.875m㎡1.057018212mm1mm0.875m㎡1.057018212mmmm0.5m㎡0.799030663mmmm0.25m㎡0.565mmmm0.025m㎡0.178668688mm0.2mmKΩBmaxCheck:1881.77GussKΩMAXdutyCheck:0.5VNpCheck40Turn110VNsCheck6.49732Turn14AKd120#DIV/0!uFMAXduty計算0.48197#DIV/0!uF#DIV/0!uF单级返馳式變壓器設計65AD-242020/4/23QRFlybackconverterdesignDescriptionItemUnitOutputpowerPoW2220Efficiencyη0.850.85OutputvoltageVoV205Sec.diodeforwarddropVfV0.450.45InputvoltageVdcV380126PrimaryturnsNp4460SecondaryTurnsNo92TurnratioNp:NoN4.8930.00ReflectedvoltageNVoV99.98163.50PrimaryinductanceLpµH5342,000Resonatingcap.CppF220700LeakageinductanceLleakµH868SwitchingfrequencyFkHz147.437.8SwitchingperiodTµs6.7926.46Effectivecorecorss-sectionareaAemm25654Max.fluxdensityBmaxmT177.9489.1PrimarypeakcurrentIpA0.8210.792PrimaryrmscurrentIprmsA0.1950.315CurrentsensingresistorRsohm0.6090.631CurrentsensingresistorselectedRs-selohm0.2000.500Ip*RsenseV0.1640.3961.425V:VCOstarts,1.45V:min.freq.VctrlV1.3361.104Outputname:Vo-5V?V-wishV125SecondarydiodedropVfV0.450.45SecondaryturnsNs92SecondaryturnsselectedNs-sel122CalculatedVoutV-resultV12.455PIVofsecondarydiodesPIVV116.19.2SecondaryaveragecurrentIoA1.304.00SecondaryrmscurrentIsrmsArms1.8677.632SecondaryrmsripplecurrentIsac-rmsArms1.36.5SecondaryoutputpowerPo-secW15.620LeakagevoltagespikeVspikeV156.5247.0NVo+VdcNVo+Vdc480.0289.5PeakdrainvoltageatswitchopeningVdspeakV636.5536.5VdsrisingslopeVdsslopekV/µs3.71.1OndutycycleDon0.1700.475ResetdytucycleDoff0.6460.366(Valley+Rising)dutycycleDw+Dleak0.1840.158ONTimeTonµs1.15412.577ResettimeToffµs4.3849.692ValleydelayTwµs1.0773.717Vds(t)risingtimeTleakµs0.1710.474Forcalculations:a0.00060.0006b0.12240.1844Io0.65400.6613I10.05700.0499I20.12510.0849Isrq0.55440.4141Inum10.35708.9549Iden2.86332.6096Date:2006-08-01By:MartinHsiao2020200.850.850.855550.450.450.4540040040060606033320.0020.0020.00109.00109.00109.001,0001,0001,00030030030020202096.796.796.710.3510.3510.35545454220.3220.3220.30.7140.7140.7140.1710.1710.1710.7000.7000.7000.7000.7000.7000.5000.5000.5001.0001.0001.000??V-Aux00190.70.70.7001133114.754.7519.2824.824.892.60.000.000.000.0000.0000.0000.00.00.0000184.3184.3184.3509.0509.0509.0693.3693.3693.32.42.42.40.1720.1720.1720.6330.6330.6330.1940.1940.1941.7851.7851.7856.5496.5496.5491.7211.7211.7210.2910.2910.2910.00050.00050.00050.14140.14140.14140.54940.54940.54940.05360.05360.05360.11440.11440.11440.40770.40770.40778.21508.21508.21502.57972.57972.5797设计要求计算过程输入端整流后电解电容电压纹波实际选择电解电容容量为：下面有三种计算方法供我们比较参考，不同的设计方法，考虑的出发点是不同的。本文中的设计，都是按照在最低输入电压、最大输出电流时，变换器工作在CCM模式或CRM模式来考虑的。输入功率Pin最低电压直流平均电流反激式开关电源参数设计v0.9作者：让你记得我的好最低交流电源电压Vacmin最高交流电源电压Vacmax交流电源频率fac输出功率Pout效率η开关频率fs稳态时MOS电压应力比例输入端最低直流电压Vinmin输入端最高直流电压Vinmax输入端电解电容容量Vc、Vf、Dmax计算方法一选择最大工作占空比RCD吸收电压与反射电压比例反射电压VfRCD箝位电压VcRCD耗散能量是漏感能量的倍数MOS工作电压应力MOS耐压要求Vc、Vf、Dmax计算方法二指定MOS耐压设定RCD箝位电压比反射电压高RCD箝位电压Vc反射电压VfMOS工作电压应力最大工作占空比RCD耗散能量是漏感能量的倍数Vc、Vf、Dmax计算方法三指定MOS耐压RCD箝位电压与反射电压比例RCD箝位电压Vc反射电压VfMOS工作电压应力综合以上计算结果，对比后，我们选择其中一种方法的结果来作为后继计算的起点。把结果填入下面表格:不管是DCM还是CCM方式，都有这么一个公式成立：Pin=(1/2)×Vinmin×(Ip1+Ip2)×Dmax，所以：下面，我们在设计中面临着另一个分水岭，是选择CCM，还是选择DCM如果选择DCM，那么Ip1=Ip2=如果选择CCM，并定义Ip2=3Ip1则,Ip1=Ip2=根据公式，Lp=Vinmin×Dmax/(fs×(Ip2-Ip1))，可以求出两种模式下的初级电感量：Lp=Lp=下面根据AP法，选择磁芯规格。先计算所需要AP值：设定最大工作磁感应强度为设定电流密度为设定占空系数为AP=AP=经查询磁芯参数，选择一款的磁芯：Ae