一种低压大电流输入的组合式直流变换器研究

Research of a Combined Converter for Low-voltage and High-current Input

针对特种车辆车载电源低压大电流输入、高可靠性和高功率密度的要求,提出了一种并-并型的双管正激组合变换器。该组合变换器以双管正激电路为基本单元,具有抗桥臂直通和高频变压器无偏磁的优点;在控制上采用了交错并联的方法,各开关管电流应力低、输入输出滤波器体积小、动态响应速度快,而采用主从均流的控制方法很好的实现了两输出电感的并联均流。理论分析和实验结果均表明该组合型变换器适合应用于低压大电流输入的特种车辆。

This paper proposes a type of combined converter formed by four dual-switch forward converters for low voltage-high current input,high reliability and high power density application requirements of armored vehicle supply.And there is no risk of leg straight and transformer magnetic bias.The converter achieves low current stress,small fil-ters and fast dynamic response by interleaving control method and good parallel inductor current sharing by master-slave current sharing control method.