基于DSP的无桥PFC变换器研究

Research on bridgeless PFC converter based on DSP

针对传统开关电源桥式整流滤波部分给电网带来的谐波污染,高效率无桥功率因数变换器成为国内外学术界以及工业界的研究热点。立足于双二极管式无桥PFC(2nd DBPFC)变换器,完成变换器系统方案设计与器件选型,详细分析其工作模态,并结合平均电流控制策略完成2nd DBPFC变换器控制程序的编写。基于含有DSP内核的PIC32MK1024MCF064芯片,研制了一台1 kW的2nd DBPFC变换器。试验结果表明,变换器在220 V输入满载条件下,功率因数达到98.7%。

Aiming at the harmonic pollution caused by the traditional switching power supply bridge rectifier filter,the high efficiency bridgeless power factor converter has become a research focus in academia and industry at home and abroad.Based on the dual-diode bridgeless PFC(2nd DBPFC)converter,the converter system design and components selection are completed,its working mode is analyzed in detail,and the 2nd DBPFC converter control system is completed combining the average current control strategy.Finally,based on the PIC32MK1024MCF064 chip with DSP core,a 1 kW 2nd DBPFC converter was developed.The test results show that the converter has a power factor of 98.7%at 220 V input full load.