两级式电流馈电推挽变换器的设计

与传统的两级式电压馈电推挽变换器相比，两级式电流馈电推挽变换器省去了前级降压式变换电路（BUCK）的输出电容和后级推挽的输出电感，因而在低压大电流多路输出的应用场合具有较大优势。文章介绍了该变换器的工作原理和主要参数设计，并进行了实验验证。实验表明：该变换器具有输入电压范围宽、开关管电压应力小的优点。

Design of Cascaded current - fed Push - pull Converter

Compared with traditional cascaded voltage-fed push-pull converter, cascaded current-fed push- pull converter got rid of the pre-stage buck output capacitor and post-stage push-pull output inductor, therefore there were obvious advantages on low voltage high current multi-output power supply occasions. This paper in- troduced the principles of this converter and the main parameter design, and the experiment result was verified. It indicates that the converter has some advantages： wide range input voltage and small voltage stress of switch tube.