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Overview 拓扑种类多 开关电源基本拓扑 输入输 出不隔 离 ①串联型——buck converter ②并联型——boost converter ③倒极性——buck-boost converter ④Ćuk converter ⑤sepic converter ⑥zeta converter 输入输 出隔离 ① 正激变换器——forward converter ② 反激变换器——fly-back converter ③ 推挽变换器——push-pull converter ④ 半桥变换器——half-bridge converter ⑤ 全桥变换器——full-bridge converter 2

Fundamental relationship (1. 5) From (1. 2 ) & (1. 4) (1. 6) (1. 7) (1. 8) 开关电源基本拓扑 8

Vin = constant (输入电压恒定) For Vo=Vin Dy, so eq. (1. 16) can be reformed as: Fig 1. 4 Vin=const 开关电源基本拓扑 12

Vout = constant (输出电压恒定) For Vo=Vin Dy, so eq. (1. 16) can be reformed as: Fig 1. 5 Vout=const 开关电源基本拓扑 13

电流连续时(CCM)的 作原理(operating principle) Mode 1 [0, Ton] (3. 1) (3. 2) 开关电源基本拓扑 19

Fundamental relationship (3. 5) From (3. 2 ) & (3. 4) (3. 6) (3. 7) (3. 8) 开关电源基本拓扑 21

Vin = constant (输入电压恒定) From eq. (2. 14), then the eq. (2. 16) and eq. (2. 15) can be reformed as: Fig 1. 4 Vin=const 开关电源基本拓扑 25

Vout = constant (输出电压恒定) From eq. (2. 14), then the eq. (2. 16) and eq. (2. 15) can be reformed as: Fig 1. 5 Vout=const 开关电源基本拓扑 26

F. 磁通复位与偏磁 Vin US Cf 1, 磁通复位 BS Bm -Im(max) B = 2 Bm BS Bm -Im(max) -Bm B = 2 Bm UP, IP -Bm 开关电源基本拓扑 43