单周期控制的带纹波抑制单元无桥Boost PFC变换器研究

doi:10.16088/j.issn.1001-6600.2021082201

摘要/Abstract

摘要： 为了解决无桥Boost功率因数校正(PFC)存在的输出电压纹波大以及输出负载突变造成的输出电压波动等问题,本文基于无桥Boost PFC拓扑设计了纹波抑制单元来减小直流输出纹波,并增加负载电流前馈控制对单周期控制方式进行优化。通过理论及原理分析可知纹波抑制单元可以减小直流输出纹波,负载电流前馈控制能够迅速采集负载突变引起的输出电流变化量并及时进行信号调理使输出电压快速稳定,从而增加系统动态稳定性。通过仿真对比分析发现,使用抑制单元后纹波系数从2.5%降到0.25%,在增加负载电流前馈控制方式后,无论是输出负载突增还是突减,输出电压都可以在极短时间内恢复稳定,并且功率因数校正的效果不会发生变化,该仿真结果验证了设计的正确性。

关键词: 无桥Boost PFC, 单周期控制, 纹波抑制单元, 负载电流前馈, 控制策略

Abstract: In order to solve the problems of large output voltage ripple in the bridgeless Boost power factor correction (PFC) and output voltage fluctuations caused by sudden changes in output load, this paper designs a ripple suppression unit based on the bridgeless Boost PFC topology to reduce the DC output Ripple, and to increase the load current feedforward control to optimize the single-cycle control mode. Through theoretical and principle analysis, it can be known that the ripple suppression unit can reduce the DC output ripple, and the load current feedforward control can quickly collect the output current change caused by the load mutation and perform signal conditioning in time to quickly stabilize the output voltage, thereby increasing the dynamic stability of the system sex. Through simulation and comparative analysis, the ripple coefficient is reduced from 2.5% to 0.25% after using the suppression unit. After the load current feedforward control is increased, the stability of theoutput voltage can be restored in a very short time regardless of the sudden increase or decrease of the output load.And at the same time the effect of power factor correction keeps anchangeable. The simulation result verifies the correctness of the theoretical analysis.

Key words: bridgeless Boost PFC, single cycle control, ripple suppression unit, load current feed forward, control strategy

中图分类号:

TM46

王党树, 仪家安, 董振, 杨亚强, 邓翾. 单周期控制的带纹波抑制单元无桥Boost PFC变换器研究[J]. 广西师范大学学报（自然科学版）, 2022, 40(4): 47-57.

WANG Dangshu, YI Jiaan, DONG Zhen, YANG Yaqiang, DENG Xuan. Research on Bridgeless Boost PFC Converter with Ripple Suppression Unit Based on Single Cycle Control[J]. Journal of Guangxi Normal University(Natural Science Edition), 2022, 40(4): 47-57.

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