開(kāi)關(guān)電源拓?fù)浣Y(jié)構(gòu)分析課件

開(kāi)關(guān)電源拓樸結(jié)構(gòu)分析FAENAME：CARY.CHENSZ2電源的分類什么是PowerSupply?PowerSupply負(fù)載Vin,IinPowerSupply是一種提供電力能源的設(shè)備，它可以將一種電力能源形式轉(zhuǎn)換成另外一種電力能源形式，并能對(duì)其進(jìn)行控制和調(diào)節(jié)。上級(jí)電能形式Vo,Iof,phasef,phase根據(jù)轉(zhuǎn)換的形式分類:AC/DC,DC/DC,DC/AC,AC/AC根據(jù)轉(zhuǎn)換的方法分類:線性電源，相控電源，開(kāi)關(guān)電源根據(jù)調(diào)控的效果分類:穩(wěn)壓，恒流，調(diào)頻，調(diào)相根據(jù)調(diào)控的方法分類:傳統(tǒng)反饋控制，矢量控制，數(shù)位控制2開(kāi)關(guān)電源的元件構(gòu)成開(kāi)關(guān)電源的基本元件：有源開(kāi)關(guān)(Switch)二極管(Diode)電感(Inductor)電容器(Capacitor)變壓器(Transformer)3三種基本的隔離開(kāi)關(guān)電源VinVoSLmDVinVoLSD1D2VinVoLS1D1D2S2正激型變換器反激型變換器橋式變換器5反激變換器（Flyback）工作原理（電流連續(xù)模式）根據(jù)變壓器的伏秒平衡：IoVinVoGDSLmDn:1CoVgsIDVdsD1-DTIpIoVinVin+nVoImVLVin-nVoID-p6反激變換器（Flyback）工作原理（電流斷續(xù)模式）根據(jù)變壓器的伏秒平衡：IoVinVoGDSLmDn:1CoVgsIDVdsD1-DTIoVinVin+nVoImVLVin-nVo’ID-p-nVo根據(jù)能量守恒：7反激變換器（Flyback）工作原理（2）VcIoVinVoGDSLmDn:1LkCoVcRPloss=(Vc-Vin)2/RGDSLkVcRPloss=(Vc)2/R9反激變換器（Flyback）工作原理（3）ΔVo=？IoVinVoGDSLmDn:1LkCoVgsIDVdsD1-DTIpIoVinVin+nVoImVrICoID-p-IoVo根據(jù)Co在DT時(shí)間的基本方程：10反激變換器（Flyback）工作原理（4）多路輸出的反激變換器：減小交叉調(diào)整率的措施：盡量減少兩個(gè)繞組之間的漏感。在輔助輸出一路中加入尖峰抑制器（飽和電感）主路輸出工作于電流連續(xù)模式。采用雙路加權(quán)反饋的控制方式VinVo1GLmNpLkVo2Ns2Ns1反饋控制11諧振復(fù)位正激變換器（ResonantResetForward)（1）Ion:1VinVoLoGDSVgsILVdsD1-DTIpVLIoVin/n-Vo-VoImVinΔIL

ILLmLkCrt0t1t2t3t4Ip[t0,t1]t513諧振復(fù)位正激變換器（ResonantResetForward)（2）Ion:1VinVoLGDSVgsILVdsD1-DTIpVLIoVin/n-Vo-VoImVinΔIL

ILLmLkCrt0t1t2t3t4Ip[t1,t2]t514諧振復(fù)位正激變換器（ResonantResetForward)（3）Ion:1VinVoLGDSVgsILVdsD1-DTIpVLIoVin/n-Vo-VoImVinΔIL

ILLmLkCrt0t1t2t3t4Ip[t2,t3]t515諧振復(fù)位正激變換器（ResonantResetForward)（5）Ion:1VinVoLGDSVgsILVdsD1-DTIpVLIoVin/n-Vo-VoImVinΔIL

ILLmLkCrt0t1t2t3t4Ip[t4,t5]t5(Vin/n-Vo)DT=Vo(1-D)T根據(jù)電感的伏秒平衡：Vo=VinD/n17諧振復(fù)位正激變換器（ResonantResetForward)特征VinVoCr缺點(diǎn)：原邊開(kāi)管電壓應(yīng)力較高。諧振電容的損耗大。寬范圍輸入效率很難兼顧。優(yōu)點(diǎn)：電路簡(jiǎn)單。線性輸出控制特性。不需要輔助的吸收回路。VinVoCrVinVoCr18有源鉗位正激變換器（ActiveClampedForward)（1）Ion:1VinVoLoGDSSaILVdsDTIpVTIoVin/n-Vc/nImVinΔIL

ILLmLkCrt0t1t2t3t4Ip[t0,t1]t5S1S1Sa1-D+VT-19有源鉗位正激變換器（ActiveClampedForward)（3）Ion:1VinVoLoGDSSaILVdsDIpVTIoVin/n-Vc/nImVinΔIL

ILLmLk-Vc+t0t1t2t3t4Ip[t2,t3]t5S1S1Sa1-D+VT-Sa在零電壓條件下開(kāi)通*原邊開(kāi)管的死區(qū)時(shí)間需滿足：21有源鉗位正激變換器（ActiveClampedForward)（4）Ion:1VinVoLoGDSSaILVdsDIpVTIoVin/n-Vc/nImVinΔIL

ILLmLk-Vc+t0t1t2t3t4Ip[t3,t4]t5S1S1Sa1-D+VT-激磁電流反向，變壓器被復(fù)位22有源鉗位正激變換器（ActiveClampedForward)（5）Ion:1VinVoLoGDSSaILVdsDIpVTIoVin/n-Vc/nImVinΔIL

ILLmLk-Vc+t0t1t2t3t4Ip[t4,t5]t5S1S1Sa1-D+VT-激磁電流對(duì)主開(kāi)關(guān)的輸出電容放電。t6=t023有源鉗位正激變換器（ActiveClampedForward)（7）Ion:1VinVoLoGDSSaILVdsDIpVTIoVin/n-Vc/nImVinΔIL

ILLmLk-Vc+t0t1t2t3t4Ip[t5,t6]t5S1S1Sa1-D+VT-t5時(shí)刻副邊二極管鉗位主開(kāi)關(guān)的輸出電容放電結(jié)束。t6時(shí)刻新的周期開(kāi)始t6=t025有源鉗位正激變換器（ActiveClampedForward)（8）Ion:1VinVoLoGDSSaILVdsDIpVTIoVin/n-Vc/nImVinΔIL

ILLmLk-Vc+t0t1t2t3t4Ipt5S1S1Sa1-D+VT-t6=t0(Vin/n-Vo)DT=Vo(1-D)T根據(jù)電感的伏秒平衡：Vo=VinD/nVinDT=Vc(1-D)T根據(jù)變壓器的伏秒平衡：Vc=VinD/(1-D)Vds=Vc+VinVds=Vin/(1-D)26有源鉗位正激變換器（ActiveClampedForward)（9）Vc=VinD/(1-D)Vds=Vin/(1-D)Vin27橋式變換器（BridgeTypeConverter)VinVoLS1D1D2S2半橋變換器VinVoLS1D1D2S2全橋變換器VinVoLS1D1D2S2推挽變換器VinVoS1D2S2半橋變換器（倍流整流）29橋式變換器（BridgeTypeConverter)（1）VinVoLoS1D1D2S2n:1+1LmLkIpIoCBVTS1ILVds1DIpVTIoVin/2n-Vin/2nImVinΔIL

t0t1t2t3t4t5S2Dt6=t0T/2T/2Vc[t0,t1]變換器正半周工作，Ip,Im增加；Vc減少。C1C130橋式變換器（BridgeTypeConverter)（2）VinVoLoS1D1D2S2n:1+1LmLkIpIoBVTS1ILVds1DIpVTIoVin/2n-Vin/2nImVinΔIL

t0t1t2t3t4t5S2Dt6=t0T/2T/2VcC1CC1Vin/2[t1,t2]S1關(guān)斷，變壓器副邊續(xù)流，原邊漏感能量被S2體二極管鉗位。31橋式變換器（BridgeTypeConverter)（3）VinVoLoS1D1D2S2n:1+1LmLkIpIoBVTS1ILVds1DIpVTIoVin/2n-Vin/2nImVinΔIL

t0t1t2t3t4t5S2Dt6=t0T/2T/2VcC1CC1Vin/2[t2,t3]S1，S2全部關(guān)斷，變壓器副邊續(xù)流，Lm保持不變，D1,D2電流之差為L(zhǎng)m。32橋式變換器（BridgeTypeConverter)（4）VinVoLoS1D1D2S2n:1+1LmLkIpIoABS1ILVds1DIpVTIoVin/2n-Vin/2nImVinΔIL

t0t1t2t3t4t5S2Dt6=t0T/2T/2Vin/2VTVc[t3,t4]變換器負(fù)半周工作，Ip,Im減少；Vc增加。33橋式變換器（BridgeTypeConverter)（5）VinVoLoS1D1D2S2n:1+1LmLkIpIoABS1ILVds1DIpVTIoVin/2n-Vin/2nImVinΔIL

t0t1t2t3t4t5S2Dt6=t0T/2T/2Vin/2VTVc[t4,t5]S2關(guān)斷，變壓器副邊續(xù)流，原邊漏感能量被S1體二極管鉗位。34橋式變換器（BridgeTypeConverter)（6）VinVoLoS1D1D2S2n:1+1LmLkIpIoBVTS1ILVds1DIpVTIoVin/2n-Vin/2nImVinΔIL

t0t1t2t3t4t5S2Dt6=t0T/2T/2VcC1CC1Vin/2[t5,t6]S1，S2全部關(guān)斷，變壓器副邊續(xù)流，Lm保持不變，D1,D2電流之差為L(zhǎng)m。[t0,t1][t1,t3]35橋式變換器（BridgeTypeConverter)（7）VinVoLoS1D1D2S2n:1+1LmLkIpIoBVTC1CC1缺點(diǎn)：變壓器結(jié)構(gòu)復(fù)雜。輸入電壓范圍較小。優(yōu)點(diǎn)：變壓器正負(fù)工作，不需要輔助的復(fù)位電路。輸出紋波頻率是開(kāi)關(guān)頻率的兩倍，所需電感量小。線性輸出控制特性。電路平衡對(duì)稱。36幾種隔離式變換器之比較變壓器復(fù)位方式原邊開(kāi)管電壓應(yīng)力輸出特性占空比范圍輸出紋波頻率輸出紋波電流適用范圍反激輸出電壓復(fù)位Vds=Vin/(1-D)0<D<1f小功率，寬范圍輸