强激光与粒子束, 2014, 26(4): 045041, 网络出版: 2014-04-01
High frequency high turn ratio pulse transformer coupled hard tube solid-state modulator
西南交通大学 物理科学与技术学院, 成都 610031
调制器 脉冲变压器 绝缘栅双极晶体管 固态开关 modulator pulse transformer insulated gate bipolar transistor solid-state switch
调制器输出脉冲宽度存在两种模式，输出脉冲宽度为10 μs时，工作频率0~8 kHz可调，输出脉冲宽度为200 μs时，工作频率0~400 Hz可调。为了实现了调制器的小型化，初级电压设计为700 V，初级储能电容可采用高储能密度的电解电容，且可降低绝缘栅双极晶体管(IGBT)串联的风险，次级输出电压为70 kV，采用变比为100的脉冲变压器。概述其各个组成部分及其工作原理，重点对IGBT固态开关的驱动、保护电路、损耗和吸收回路进行了分析讨论，并对高变比的变压器进行了理论分析。对调制器进行了实验测试，脉冲前沿2.2 μs，脉冲后沿1.65 μs，过冲小于7%，脉冲顶降小于1%。
High frequency high turn ratio pulse transformer coupled solid state hard tube modulator was developed, the output voltage was 70 kV, and the output current was 12 A. The output pulse had two modes for 10 μs and 200 μs, when the output pulse was 10 μs, the work frequency could adjust from 0 to 8 kHz; when the output pulse was 200 μs, the working frequency could be adjusted from 0 to 400 Hz. The modulator was very compact, the overall size was 947 mm×1127 mm×1350 mm. The paper gave a brief overview of its components and working principle, focusing on the driver for IGBT solid switch, protection of the circuit and the power loss. Experiments were carried out to test the modulator , the pulse leading edge was 2.2 μs, pulse trailing edge was 1.65 μs, overshoot was smaller than 7%, the flat top was less than 1%, and the system was reliable and stable.