一种基于DSP的半桥数字开关电源设计

摘要

针对正激变换器变压器磁复位需要增加铁心复磁电路,电压应力高;反激式变换器峰值电流较大,输出电压纹波大等问题.文中设计了一款基于DSP的半桥数字开关电源,提出了一种新型的正反激开关电源拓扑,介绍了主电路工作原理,并以TMS320LF2407A DSP芯片为核心,完成了系统硬件电路设计及软件数字PID算法.实验结果表明,该设计软硬件设计合理,实现了数字化采样、运算、控制输出等功能.%According to the forward converter transformer reset need increase the core complex magnetic circuit,existence the problem of high voltage stress;There are also some defects with the flyback converter,such as the peak current is large and high output voltage ripple.This paper introduces the design of a half bridge switching power supply based on digital DSP.The design proposed a new model of forward and flyback switching power supply,introduced the working principle of the main circuit,using TMS320LF2407A Digital Signal Processor as the core.The hardware circuit design and software digital PID algorithm are accomplished, and the functions of digital sampling, operation and control are realized.