基于宽范围升压变换器最大效率移相轨迹控制研究

Research of maximum efficiency phase-shift trajectory control based on wide voltage range converter

本文提出了一种能够实现最大效率的最优移相轨迹控制方法,可用于一种新型的输入并联输出串并联移相全桥变换器。该变换器采用柔性变拓扑技术,通过控制电压的大小与极性,能够在输入并联输出并联以及输入并联输出串联架构间进行无缝灵活切换,从而实现宽范围的输出电压范围。基于变换器工作原理,提出了系统的全解析损耗模型,能够计算变换器在不同移相控制变量下的损耗情况。在此基础上,求解得到了实现最低损耗与最高效率的移相控制方案。此方案显著地优化了器件的导通损耗与变压器的总体损耗。基于上述分析结果,搭建了一个使用1700 V碳化硅二级管的1.2 kW/100 kHz原理样机,实验结果表明,所提出的变换器能2~18.6的宽电压增益范围输出,且相比传统控制提升了最高4.4%的效率。

This paper proposes an optimal phase-shift trajectory control to achieve maximum efficiency for a novel input parallel output series parallel phase shift full bridge(IPOSP-PSFB)converter.Firstly,topology of the proposed converter is flexible,which can be smoothly adjusted by controlling voltage polarity of the two primary coils,so as to achieve wide voltage range.Then,a fully analytical loss model for the IPOSP-PSFB converter is established to calculate the power loss under the entire control plane.Based on the results,the optimal phase-shift trajectory is derived to achieve maximum power efficiency,where the power loss of MOSFET and transformers are reduced obviously.Finally,a 1.2 kW/100 kHz prototype with 1700 V SiC diodes is built.The experimental result shows that the proposed converter achieves wide voltage gain range from 2 to 18.6 and improves the power efficiency by 4.4%.