ABSTRACT

This paper presents a comparison of prospective design concepts of DC/DC isolated converters for auxiliary drives of DC catenary fed light traction vehicles. Auxiliary drives are mostly dedicated to generate standard power grid supplying various on-board equipment and to charge on-board batteries. The DC/DC isolated converter consists of full-bridge (FB) converter feeding a high frequency transformer (HFT) and SiC diode rectifier which produces a DC voltage bus line for 3-phase voltage-source inverter. The input FB converter is in our case designed using 1200 V devices in discrete (Si IGBTs) and module (SiC JFETs) version. The comparison deals both the hard switching and soft switching topologies of the converters. The investigated design concepts are experimentally tested up to the switching frequency of 200 kHz. The main aim of this paper is to compare efficiencies of SiC JFET and Si IGBT LLC full bridge converters operated under both continuous conduction mode (CCM) and discontinuous conduction mode (DCM). The introduced theoretical results and analyses are validated by the experiments made on developed prototype 8 kW, 400 V/600 V DC/DC isolated converter using SiC JFET and Si IGBTs

摘要

本文比较了用于直流接触网馈电轻型牵引车辆辅助驱动的 DC/DC 隔离转换器的前瞻性设计概念。辅助驱动器主要用于生成标准电网，为各种车载设备供电并为车载电池充电。DC/DC 隔离转换器由为高频变压器 (HFT) 供电的全桥 (FB) 转换器和为三相电压源逆变器提供直流电压总线的 SiC 二极管整流器组成。在我们的案例中，输入 FB 转换器是使用分立式 (Si IGBT) 和模块 (SiC JFET) 版本的 1200 V 器件设计的。比较涉及转换器的硬开关和软开关拓扑。所研究的设计概念在高达 200 kHz 的开关频率下进行了实验测试。本文的主要目的是比较 SiC JFET 和 Si IGBT LLC 全桥转换器在连续导通模式 (CCM) 和非连续导通模式 (DCM) 下运行的效率。所介绍的理论结果和分析通过在使用 SiC JFET 和 Si IGBT 的开发原型 8 kW、400 V/600 V DC/DC 隔离转换器上进行的实验得到验证