单周期控制的三相无桥PFC电路的研究

摘要

传统三相有源功率因数变换器具有多种电路拓扑形式和控制方法,但整流部分常采用全桥结构,导致输入电流谐波含量较大,电路整体效率不高,而且控制方法相对复杂.基于单相模块构建了一种新型的单周期控制的三相无桥功率因数校正(PFC)电路,通过自耦变压器将三相电路解耦为两相无桥Boost PFC电路并联而成.为削弱2个并联电路之间的耦合干扰,加入分离元件实现了对2个并联电路的独立控制.仿真与实验结果验证了该单周期控制的三相无桥PFC电路的正确性,实现了高功率因数,采用无桥方案也有助于提高电路的整体效率,单周期控制策略控制简单,简化了电路结构.%There are several circuit topologies and control methods for traditional three-phase APFC (active power factor correction)converter.However,the rectifiers often use full-bridge,which results in low efficiency of the whole circuit,high input of current harmonics and complexity of the control methods.Based on single phase module,a novel one-cycle controlled three-phase bridgeless PFC circuit is established through paralleling two-phase bridgeless Boost PFC circuits by autotransformer.In order to reduce the coupling interference between two paralleling circuits,the discrete elements are added to achieve the independent control of the two paralleling circuits.Simulation and experiment have proved the correctness of the proposed system.The new circuit can achieve high power factor,and the bridgeless scheme is helpful to raise the total efficiency of the circuit.Simple in control,the one-cycle control strategy can simplify the circuit structure.