基于IGBT开关的重复频率直线变压器

摘要

A repetitive linear transformer driver(LTD) based on IGBTs has been tested. The device has four 3 300 V/1 200 A IGBT switches and corresponding drivers, buffer circuits, capacitors, and magnetic core. It can output 4. 3 kA current on 0. 57 O load and achieve a 200 Hz repetition frequency at burst mode. The test result shows that the LTD based on IGBTs can work in repetition mode and the LTD circuit can enhance the operation voltage of IGBTs. Core saturation and reset problems are also ana lyzed, and an effective method to solve core saturation without reset is proposed.%采用3 300 V/1 200 A IGBT开关及直线变压器的电路结构,实现了单模块时在0.57 Ω负载上4.3 kA的脉冲电流输出和模块串联时在2.2 Ω负载上4.6 kV的电压输出,猝发式重复频率达到200Hz.整个系统包括4个3 300 V/1 200 A的IGBT开关器件及相应的驱动模块、缓冲模块、储能电容和磁芯等.实验结果表明:采用线性变压器的电路拓扑结构能够拓展固态IGBT开关的输出能力;直线变压器的电路结构结合固态IGBT开关能够很好地实现重复频率工作.在实验基础上分析了磁芯饱和及复位问题,并提出了一种有效的不采用复位而解决磁芯饱和的方法.