基于DSP的Boost PFC软开关变换器研究

详细分析了一种新颖的Boost软开关变换器,在传统的Boost变换器基础上加上缓冲元件电感和电容,从而实现开关管的零电流开通和零电压关断。提出了基于DSP的新型控制算法,该算法仅需在一个开关周期内采样负载电流和输入电压来计算占空比,实现功率因数校正(PFC)的目的,控制简单,实时性好。实验结果表明,该新型的变换器工作在软开关模式下,并且实现输入侧的单位功率因数。

Research on a Boost PFC Soft-switching Converter with DSP

A novel Boost converter with soft-switching is introduced and several passive components are added,such as auxiliary resonant inductor and resonant capacitor,in the traditional converter to achieve zero-voltage-switch turn-off and zero-current-switch turn-on.The operating principle of Boost soft-switching converter is specifically described,and a new control algorithm is presented based on DSP to compute the duty ratio of PFC within one switching period by sampling load current and input voltage.This method is simple and with good real-time control capability.Finally,the results show that the new Boost converter can operate in the soft-switch condition,and achieve unity-power factor.