适用于低电压输出的单级式无桥buck-boost PFC变换器 -- 西北工业大学学报,2015,33(5):757-762
论文:2015,Vol:33,Issue(5):757-762
引用本文:
赵犇, 马瑞卿. 适用于低电压输出的单级式无桥buck-boost PFC变换器[J]. 西北工业大学学报
Zhao Ben, Ma Ruiqing. Single Stage Bridgeless Buck-Boost PFC Converter for Low Output Voltage Application[J]. Northwestern polytechnical university

适用于低电压输出的单级式无桥buck-boost PFC变换器
赵犇, 马瑞卿
西北工业大学 自动化学院, 陕西 西安 710072
摘要:
传统的boost型功率因数校正变换器需要额外1级DC-DC变换器才能实现低电压输出,而buck型拓扑由于在电网电压低于输出电压时没有输入电流而导致电流畸变很大,因此buck-boost型拓扑就成为在低电压输出场合实现单级式功率因数校正的优先选择。相较于经典的级联式buck-boost功率因数校正变换器,文中所提出的单级式无桥buck-boost拓扑所需的半导体器件数量更少,且导通回路中的功率器件个数也大大减小,从而可以降低导通损耗;加上引入了耦合电感提高了电压衰减率,因此特别适合低电压输出场合;采用了单周期控制作为功率因数校正的控制方法,具有更好的动态性能,而且电路实现中无需乘法器,还可以进一步简化控制电路、降低成本。仿真结果表明,所提的拓扑工作原理可行、结构简单;采用单周期控制实现的功率因数校正功能可靠、电流畸变率低、功率因数高。
关键词:    单级式    无桥    buck-boost    耦合电感    PFC(power factor correction)    OCC(one cycle control)   
Single Stage Bridgeless Buck-Boost PFC Converter for Low Output Voltage Application
Zhao Ben, Ma Ruiqing
Department of Automatic Control, Northwestern Ploytechnical University, Xi'an 710072, China
Abstract:
An additional DC-DC converter is needed for traditional boost power factor correction (PFC) converter to obtain low output voltage. When using buck type topology, the distortion of input current is large because no power is transferred to output when gird voltage is lower than output voltage. Thus, the buck-boost type topology becomes priority in the low output voltage application. Compared with the classic cascaded buck-boost PFC converter, the proposed single stage bridgeless buck-boost topology has lower semiconductors counts, and lower devices counts in the conduction loop which means less conduction losses. The tapped inductor is employed to achieve more attenuation. Thus, the proposed topology suits the low output voltage application very well. The One Cycle Control (OCC) is adopted to achieve good dynamic performance and the elimination of multiplier can simplify the control circuit and reduce the cost. The simulated results and their analysis show preliminarily that: (1) the proposed topology is feasible and has the merits of simple structure and less conduction losses; (2) the power factor correction using OCC is reliable and has the advantages of low current distortion and high power factor.
Key words:    control    cost reduction    efficiency    electric conductance    electric converters    inductance    low pass filters    pulse width modulation    reliability    switching frequency    topology    bridgeless    buck-boost    OCC(one cycle control)    PFC (power factor correction)    single stage   
收稿日期: 2015-04-16     修回日期:
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作者简介: 赵犇(1987—),西北工业大学博士研究生,主要从事电力电子变换器的研究。
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