一族电感耦合式Dual-Boost无桥三电平整流器

A Family of Dual-Boost Bridgeless Three-level Rectifiers With Common-core Inductors

通过对耦合电感、双向开关管单元与无桥功率因数校正电路(power factor correction,PFC)的有机融合,提出一族基于电感耦合式双升压(Dual-Boost)无桥三电平整流器。在无桥PFC电路桥臂与直流侧上下分裂电容之间嵌入双向开关管单元,在每个工频周期无桥PFC电路桥臂之间产生5种电平,可减小开关损耗。所提三电平整流电路共用耦合电感磁芯以提高磁芯利用率,且其两桥臂间的五电平电压可降低交流侧电流谐波,该拓扑具有开关管电压/电流应力较低的特点。阐述拓扑推导过程,分析所提拓扑的工作原理、耦合电感特性,研究控制及调制策略,并搭建输入220V/50Hz、额定输出1kW/400V的实验样机,验证所提方案的可行性和理论分析的正确性。

A family of Dual-Boost bridgeless three-level rectifiers based on coupled inductors was proposed by combining coupled inductors,bidirectional switch unit and bridgeless power-factor correction circuit(PFC).The bidirectional switch unit was embedded between the bridge arm of the bridgeless PFC circuit and the two split capacitors on the DC side,which reduced the switching loss due to the realization of five-level between the topological bridge arms in each line cycle.The proposed three-level rectifiers in this paper used a pair of common core coupled inductors to improve the core utilization.The five-level voltage between the two bridge arms can reduce the AC side current harmonics.The proposed topologies have the characteristics of low voltage/current stress on the power switches.The paper described the process of topologies derivation,analyzed the operating principle,coupled inductors characteristics of the proposed topologies,and studied the control and modulation strategies.Finally,an experimental prototype of rated output of 1kW/400V with an input of 220V/50Hz was built to verify the feasibility of the proposed scheme and the correctness of the theoretical analysis.