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

Abstract

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

CLC Number:

TM46

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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Research on Bridgeless Boost PFC Converter with Ripple Suppression Unit Based on Single Cycle Control

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