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冲击电流发生器的设计
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摘要
高电压技术,作为以试验研究为基础的应用技术,研究各种形态的高电压,冲击电流和各种性能的介质,需要有高电压的测试设备,研究介质在高电压下的物理现象。高电压技术对电力工业、电工制造业以及近代物理的发展都有重大影响。冲击电流发生器作为高压技术研究的一个方面,已应用到以下重要的科学研究领域:等离子体焦点和强脉冲磁场,电磁冲击模拟,强流电子束集团加速等高能物理中。
     本文主要介绍了高压技术的发展,总结了在各类高电压试验和应用中,高电压和大电流实验中共性的技术问题,特别地,对于在高电压技术中最重要的测量技术部分,及可能产生的误差进行了分析,提出了相对应的应该采取的措施。分析了冲击电流发生器的电路原理,各个功能模块包括高压初级能源,三电极火花隙开关等的原理,设计了红外控制下的冲击电流发生器电路,主要包括倍压电源电路,分压器对冲击电压波形的采集电路,分流器对冲击电流的波形采集电路及上位机和下位机的红外控制接口电路包括SPI接口和IrDA接口转换电路。重点介绍了远程控制的软件部分的实现,包括红外控制协议栈,主要包括红外通信协议的物理层帧的定义,媒介访问控制协议MAC,逻辑链路控制层LLC,上位机和从机工作模式,工作流程图及MAC主函数。对冲击电流试验中采集到的电流波形进行了分析。分别对钼丝和钽丝在不同的冲击电压的条件下所对应的电流波形图进行了分析。
     通过对比在不同冲击电压作用下试件的冲击电流波形,分析了影响冲击电流大小的因素,为后续试验获取最佳充电电压值的确定提供参考。
As an application technology based on experiment ,high voltage technology , which focused on various high voltage and media ,adopted high voltage measurement equipment to testify the physical phenomenon of media under high voltage .High voltage technology has a far reaching influence on the development of power industry ,electrical manufacture and modern physics. As an aspect of high voltage technology, instantaneous current generator ,has been applied in the following important high energy physical scientific research field: plasma focus, strong impulse magnetic, electrical and magnetic instantaneous simulation, strong electron beam acceleration etc.
     This paper retrospected the development of high voltage technology, draw a conclusion of the common problems in high voltage experiment, especially ,analyzed the error that might be encountered in high voltage measurement ,and gave the way on how to take effective measure. Primarily analyzed the circuit theory of instantaneous current generator and each function module including high-voltage power and tri-pole sparkle switch. Designed the instantaneous current generator circuit based on the control of infrared ,which including multiple voltage power, division voltage sampling ,division current sampling circuit and infrared control interface circuit between server and client ,the transformation of SPI and IrDA interface circuit. Emphasized on the implementation of infrared control protocol ,which including infrared communication protocol stack, particularly illustrated the specification of physical layer of IrDA, the structure of frame, Media Access Control protocol (MAC), Logic Link Control (LLC),working model, of server and client, main function of MAC layer. Analyzed the voltage and current wave collected in the instantaneous current experiment, the current wave of molybdenum and tantalum under different instantaneous voltage respectively
     Drew a conclusion on the factors that affect instantaneous current by comparing the instantaneous current of the metal wire which can be referred on how to determine the optimal charge voltage in the further research.
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