1、0.587589929Current Density(電流密度J):4A/m電流密度J 可取3 5A/mCore MAX flax Bmax(最大磁通密度):1800Guss自然冷卻取1.5-4 風扇冷卻取3-6MAX working duty(占空比):0.5Dmin(最小占空比):0.275362319Frequcncy Max(計算工作頻率):75.39267KHzAp(鐵芯截面積乘積S):0.7188 cm4計算鐵芯功率:100.05696(實際選)工作頻率:75KHzT周期(uS):13.33333333Output diode(輸出二极體正向壓降Vf):0.6V(dc)R.C.C
2、F97.7547295Core Type(鐵芯型號):PQ26-20Np=40.14200961(變壓器效率):0.9%KT(圈數Ns比Np):0.162432972初极每T平均電壓:8.4852814V(dc)KT1(圈數Np比Ns):6.260984315次极每T平均電壓:3.2244069V(dc)一般講圈數比指Np比NsOutput voltage(輸出電壓1,主回授):20V(dc)Ns1(次極圈數1):6.388771795F.Back to IC Voltage(IC 回授電壓):15.6V(dc)Nvcc(回授圈數):5.024179761Output voltage(輸出電壓
3、 2):V(dc)Ns2(次極圈數2):0.186080732Output voltage(輸出電壓 3):V(dc)Ns3(次極圈數3):0.186080732Output voltage(輸出電壓 4):V(dc)Ns4(次極圈數4):0.186080732計算銅線線徑KL電感系數:0.42653538Dwp(計算初級線徑)Ls1(次級線圈感量):15.355274 uHDws1(計算次級線徑)Ls2(次級線圈感量):0 uH Dws2(計算次級線徑):Ls3(次級線圈感量):0uHDws3(計算次級線徑):Ls4(次級線圈感量):0uHDws4(計算次級線徑):Lvcc(迴授線圈感量):
4、10.663385 uHDwvcc(計算回授線徑):Vs1VRup22.5624Rs0.397Rdown3.16Watts1.24WattsVref(TL431)2.5開關管選擇 Vce(min)679V輸出二極體反向電壓 VFmin開關管選擇 Ic(min)6A輸出二極體正向峰值電流 IFminCin(輸入電容選擇):116 uFCout2(輸出電容選擇):Cvcc(Vcc電容選擇):43 uFCout3(輸出電容選擇):Cout1(輸出電容選擇):1167 uFCout4(輸出電容選擇):单级返馳式變壓器設計版本:V1.2變壓器編號:65AD-24日期:2014/2/24 Input Ri
5、pple:0VoltsKv(輸入電壓比值):2.6316Vin,min:128.98V(dc)1.119930331Vin,max:339.41V(dc)cm4lg(鐵芯氣隙長度):0.5649 mm Ku(繞組系數):0.27lg(修正):0.3506 mm繞組系數取 0.2 0.5Rt=1.91KCt=10000 pFWattsTON導通時間(uS):6.66666667 TOFF截止時間(uS):6.6667KHzTurn40Lp=426.54 uH 修正Lp min=682.46 uHTurn6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
6、(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0.165683359m0.459957694mm0.5mm0.875m1.057018212mm1mm0.875m1.057018212mmmm0.5m0.799030663mmmm0.25m0.565mmmm0.025m0.178668688mm0.2mmKBmax Check:1881.8GussKMAX duty Check:0.5VNp Check40Turn110VNs Check6.4973Turn14AKd120#DIV/0!uFMAX du
7、ty 計算0.482#DIV/0!uF#DIV/0!uFQR Flyback converter designDescriptionItemUnitOutput powerPoW2220Efficiency0.850.85Output voltageVoV205Sec.diode forward dropVfV0.450.45Input voltageVdcV380126Primary turnsNp4460Secondary TurnsNo92Turn ratio Np:NoN4.8930.00Reflected voltageNVoV99.98163.50Primary inductanc
8、eLpH5342,000Resonating cap.CppF220700Leakage inductanceLleakH868Switching frequencyFkHz147.437.8Switching periodTs6.7926.46Effective core corss-section areaAemm25654Max.flux densityBmaxmT177.9489.1Primary peak currentIpA0.8210.792Primary rms currentIprmsA0.1950.315Current sensing resistorRsohm0.6090
9、.631Current sensing resistor selectedRs-selohm0.2000.500Ip*RsenseV0.1640.3961.425V:VCO starts,1.45V:min.freq.VctrlV1.3361.104Output name:Vo-5V?V-wishV125Secondary diode dropVfV0.450.45Secondary turnsNs92Secondary turns selectedNs-sel122Calculated VoutV-resultV12.455PIV of secondary diodesPIVV116.19.
10、2Secondary average currentIoA1.304.00Secondary rms currentIsrmsArms1.8677.632Secondary rms ripple currentIsac-rmsArms1.36.5Secondary output powerPo-secW15.620Leakage voltage spikeVspikeV156.5247.0NVo+VdcNVo+Vdc480.0289.5Peak drain voltage at switch openingVds peakV636.5536.5Vds rising slopeVds slope
11、kV/s3.71.1On duty cycleDon0.1700.475Reset dytu cycleDoff0.6460.366(Valley+Rising)duty cycleDw+Dleak0.1840.158ON TimeTons1.15412.577Reset timeToffs4.3849.692Valley delayTws1.0773.717Vds(t)rising timeTleaks0.1710.474For calculations:a0.00060.0006b0.12240.1844Io0.65400.6613I10.05700.0499I20.12510.0849I
12、srq0.55440.4141Inum10.35708.9549Iden2.86332.6096Date:2006-08-01By:Martin Hsiao2020200.850.850.855550.450.450.4540040040060606033320.0020.0020.00109.00109.00109.001,0001,0001,00030030030020202096.796.796.710.3510.3510.35545454220.3220.3220.30.7140.7140.7140.1710.1710.1710.7000.7000.7000.7000.7000.700
13、0.5000.5000.5001.0001.0001.000?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.
14、14140.14140.14140.54940.54940.54940.05360.05360.05360.11440.11440.11440.40770.40770.40778.21508.21508.21502.57972.57972.5797反激式开关电源参数设计 v0.9 作者:让你记得我的好设计要求最低交流电源电压Vacmin最高交流电源电压Vacmax交流电源频率fac输出功率Pout效率开关频率fs稳态时MOS电压应力比例计算过程输入端最低直流电压Vinmin输入端最高直流电压Vinmax输入功率Pin最低电压直流平均电流输入端整流后电解电容电压纹波输入端电解电容容量实际选择电解
15、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。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工作电压应力最大工作占空比RCD耗散能量是漏感能量的倍数综合以上计算结果,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:最大工作占空比Dmax反射电压VfRCD箝位电压Vc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:Ip1+Ip2=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=Ip2-
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