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题名	磁脉冲压缩系统实验研究; 磁脉冲压缩系统实验研究
作者	1张东东,电工研究所
学位类别	博士
答辩日期	2008-06-11
授予单位	中国科学院电工研究所
导师	1严萍,电工研究所
关键词	脉冲功率技术 磁脉冲压缩系统 磁开关 快速恢复高压二极管 磁滞回线 Pulsed Power Technology Magnetic Pulse Compression System Magnetic Switch Fast-recovering HV diode Hysteresis curve
其他题名	磁脉冲压缩系统实验研究
中文摘要	磁脉冲压缩系统是实现高重复频率高电压脉冲输出的重要和有效的方法，将复杂的磁芯复位电路省去使磁脉冲压缩系统得到了更好的推广应用。目前应用比较多的省去磁芯复位电路的磁脉冲压缩系统有：单级磁脉冲压缩系统、两级磁脉冲压缩系统和基于快速恢复高压二极管续流的磁脉冲压缩系统。对这些不同的拓扑电路从原理、压缩过程以及实验结果三方面的详细分析得到如下结论：（1）负载并联续流电感导致负载脉冲尾部形成反峰；如果用快速恢复二极管替代续流电感，则不会在负载上形成预脉冲，仿真与实验结果均表明脉冲尾部的反峰幅值与持续时间都显著减小；（2）通过分析简化的磁压缩末级回路，了解了预脉冲产生的过程，同时得出负载阻值增大，预脉冲的峰值绝对值也随之增大；增大磁开关未饱和电感值可以显著减小预脉冲的峰值绝对值；更高的微分磁导率表明更好的磁开关开关性能等结论；（3）为了在负载上得到更高峰值、下降更快的电压脉冲，需要尽量增大负载电阻、减小磁开关饱和后电感以及减小磁开关导通时间。 磁脉冲压缩系统中软磁磁芯作为可饱和变压器和磁开关的核心部件，对磁芯的磁性能进行测量是一项必不可少的工作。选取7块磁芯，通过对磁芯在微秒级和亚微秒级脉冲激励下的动态磁性能的比较可知，2# 非晶磁芯非常适合应用在前级的可饱和变压器中；7#磁芯非常适合用于末级的磁开关中。 Pspice中的磁芯模型建立有两种方法：磁滞回线法和模板法，基于实际磁芯测试得到的B-H回线的磁滞回线法建立的磁芯模型能更准确的模拟磁芯的励磁过程，并且仿真结果显示的负载预脉冲与实际输出基本吻合。 本文从单个压缩级入手，给出n级磁脉冲压缩系统的优化设计方案。并且据此设计并制作了基于MPC的50kV，2kHz 脉冲发生器。脉冲发生器的主要技术指标：电压幅度：50kV；电流：100A；脉冲宽度：70ns；脉冲上升沿：30ns；最高重复频率：2kHz。 Magnetic Pulse Compression (MPC) system is an important and efficient method to obtain high repetition rate and high voltage output. Recently, novel MPC systems which do not contain external remagnetization circuits broaden the appliance of MPC systems. There are several such MPC systems being commonly used today. They are one-stage MPC system, two-stage MPC system and MPC system with fast-recovering HV diode. Detailed analyses of these different topology circuits are developed on the principle of the circuit, the course of compression and the experimental results as well. Conclusions are drawn as follows. (1) A negative peak occurs at the tail of the load pulse, which is caused by a fly-wheel inductance connected in parallel with the load. If a fast-recovering diode is applied as a substitute for the fly-wheel inductance, no pre-pulse appears on the load. (2) The mechanism of pre-pulse forming is specified by the analysis of the simplified magnetic compression final circuit. The experimental results show that the absolute peak value of pre-pulse increases as the resistance of the load gets higher. And it is reduced drastically with the increasing of unsaturated induction of the magnetic switch. Also, a higher relative magnetic conductivity stands for a better switching performance of the magnetic switch. (3) To get a voltage pulse with higher peak value and faster decline, the resistance of load should be as large as possible, the saturated induction of magnetic switch lower, and the conducting time of magnetic switch as short as possible. (4) Different output voltage is obtained for compression system by regulating the initial voltage of the capacity. The soft magnetic material magnetic core in a MPC system being a kernel part for both the saturable transformer and the magnetic switch, it is an absolutely necessary work to measure the magnetic performance of the magnetic core. Seven pieces of magnetic core are chosen. And comparisons of dynamic magnetic performance are made under µs level and sub-µs level pulse excitation. The result shows that non-crystal magnetic core No. 2 is quite suitable for using in preceding stage saturable transformer. Magnetic core No. 7 is quite suitable for using in final stage magnetic switch. There are two methods for magnetic core modeling in Pspice software, using device characteristic curves and templates respectively. The magnetic core model derived from the former method, which is based on the B-H curve of practical magnetic core test, is inclined to simulate the course of excitation more accurately. Besides, the simulation result shows that the load pre-pulse is basically in coincident with that of practical output. Starting with a single-stage compression, the optimum design scheme for an n-stage compression system is proposed. A 50 kV, 2 kHz pulse generator based on MPC is designed and manufactured, which delivers a -50kV, 70ns pulse width with a repetition rate up to 2 kHz.
语种	中文
公开日期	2010-10-18
页码	129
分类号	TM85
内容类型	学位论文
源URL	[http://ir.iee.ac.cn/handle/311042/6764]
专题	电工研究所_其他部门_其他部门_博士学位论文
推荐引用方式 GB/T 7714	1张东东,电工研究所. 磁脉冲压缩系统实验研究, 磁脉冲压缩系统实验研究[D]. 中国科学院电工研究所. 2008.

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