一种含吸收回路的高增益准Π源变换器

A High Gain QuasiΠ-Source Converter with Absorption Circuit

Π源变换器是一种新型变换器,与Y源变换器和Δ源变换器相比,拥有更小的磁芯尺寸、更宽的负载范围和更小的环流。针对准Π源变换器升压能力弱、电压应力大及漏感所导致的母线电压尖峰等问题,结合LCD吸收回路的结构特点,提出了一种具有母线电压尖峰吸收能力的准Π源变换器电路拓扑。分析了准Π源变换器的工作原理,并对含吸收回路的准Π源变换器进行了数学推导与理论分析。证明该电路拓扑大大提高了升压能力,降低了元器件的电压应力。由漏感引起的母线电压尖峰也得到了有效抑制,从而提高了变换器的效率。运用MATLAB/Simulink软件对电路进行了仿真,并在仿真的基础上搭建了实验样机。实验结果与理论分析基本一致,验证了改进型电路拓扑的可行性和实用性。

The Π-source converter is a new type of converter,which has smaller core size,wider load range and smaller circulating current than the Y-source converter and the Δ-source converter.Aiming at the problems of weak boost capability,large voltage stress and leakage inductance of the quasi Π-source converter,combined with the structural characteristics of the LCD absorption circuit,a quasiΠ-source converter circuit topology with the ability to absorb bus voltage spikes is proposed.The working principle of the quasiΠsource converter is analyzed,and the mathematical derivation and theoretical analysis of the quasi Π-source converter with absorption loop are carried out.It is proved that the circuit topology greatly improves the boosting capability and reduces the voltage stress of the components.The bus voltage spikes caused by leakage inductance are also effectively suppressed,thereby improving the efficiency of the converter.The circuit is simulated by using MATLAB/Simulink software,and an experimental prototype is built on the basis of the simulation.The experimental results are basically consistent with the theoretical analysis,which verifies the feasibility and practicability of the improved circuit topology.