电源拓扑简述.ppt

Power Supply Topologies电源拓扑---A Brief Overview---简述 The Most Popular Topologies最常见的拓扑结构 Buck降压 Boost升压 Buck-Boost降压-升压 Flyback反激 Forward正激 Two-Transistor Forward双晶体管正激 Push-Pull推挽 Half Bridge半桥 Full Bridge全桥 SEPIC C’uk The Basic Pulse-Width Modulated Waveform基本的脉冲宽度调制波形 These topologies all relate to switched-mode circuits.这些拓扑结构都与开关式电路有关. Definition of the basic pulse-width modulated waveform is as follows:基本的脉冲宽度调制波形定义如下: Buck, Boost and Buck-Boost降压、升压和降压-升压 Buck降压 Bucks the input down to a lower voltage.把输入降至一个较低的电压。 Flyback and Forward反激和正激 Flyback反激 Operates like the buck-boost, but the inductor has two windings and performs both as a transformer and inductor.如降压-升压电路一样工作，但是电感有两个绕组，而且同时作为变压器和电感。 Two-Transistor Forward双晶体管正激 The two switches are turned on and off simultaneously.两个开关同时打开和关闭。 When they turn off, the energy stored in the transformer reverses the polarity of the primary, causing the diodes to conduct and the transformer to reset.开关关闭时，存储在变压器中的能量使初级的极性反转，从而使二极管导通并使变压器复位。 Push-Pull推挽 The switches (FETs) are driven out of phase and pulse-width modulated (PWM) to regulate the output voltage. 开关（FET）的驱动不同相，进行脉冲宽度调制（PWM）以调节输出电压。 Half-Bridge半桥 Very popular topology for higher-power converters.较高功率变换器极为常用的拓扑结构。 The switches (FETs) are driven out of phase and pulse-width modulated (PWM) to regulate the output voltage.开关（FET）的驱动不同相，进行脉冲宽度调制（PWM）以调节输出电压。 Full-Bridge全桥 Very popular topology for higher-power converters.较高功率变换器极为常用的拓扑结构。 The switches (FETs) are driven out of phase and pulse-width modulated (PWM) to regulate the output voltage.开关（FET）的驱动不同相，进行脉冲宽度调制（PWM）以调节输出电压。 SEPIC and C’ukSEPIC 和 C’uk SEPIC (Single-Ended Primary Inductor Converter)(单端初级电感变换器) Output voltage can be either less than or greater than the input. 输出电压可以大于或小于输入电压。 安 森 美 半 导 体 占空比=负荷比=D Boost升压 Boosts the input to a higher voltage.把输入升至一个较高的电压。 Buck-Boost降压-升压 A combination of buck and boost. Output is inverted, and its magnitude can be less