用于水中灭藻纳秒级高压脉冲电源的研究
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摘要
近年来水污染日益严重,随着脉冲功率电源技术的迅速发展,污水处理和灭藻也成为它新的应用方向,这就对脉冲电源的提出了新的要求,更加快速的上升沿,特定的脉冲峰值,特定的脉冲能量,以及紧凑的结构设计,在这样的背景下,本文展开了对新型结构的纳秒级脉冲电源的研究。
     首先说明了灭藻用脉冲电源的设计思路,提出了一种Marx发生器和磁开关相结合的拓扑结构。利用Marx发生器产生百纳秒级的初级脉冲,再利用磁开关的功能对初级脉冲整形,实现纳秒级高压脉冲。
     改进传统Marx发生器的充电结构,并对充电回路建模,分析充电过程,总结出不同充电系统的影响。对放电过程进行计算,建立带有负载的放电回路模型,分析不同负载对Marx发生器性能的影响。研究了磁开关的工作特性,就脉冲陡化和脉冲压缩两种不同应用,分析由其构成的脉冲整形电路,总结饱和过程对脉冲上升沿的影响。
     根据计算结果确定电路参数,用PSPICE对Marx发生器的充电和放电过程仿真,分析各元件参数对脉冲上升沿、充电效率、脉冲峰值等的影响。利用PSPICE编辑器件的功能来建立磁开关的模型,仿真分析磁开关的整形效果。在此基础上对脉冲电源的进行单次脉冲和重复频率脉冲的仿真分析。
     最后对晶闸管的同步驱动电路进行设计,采用ATmega8作为控制器进行硬件和软件设计,并阐述了与激光实验室联合实验时,毛细管放电的实验结果。
     本文在上升时间短、紧凑化结构的脉冲电源应用和需求日益增长的形势下,开展一种新结构脉冲电源的设计工作。用仿真分析的方式证明了这种结构的可行性,为纳秒级脉冲电源的研究工作作出部分贡献。
The water pollution has been increasingly serious in recent years. Along with its development, pulse power technology has been applied in sewage treatment and algae elimination. Some new requests have been set to pulse, such as shorter rising time, specific pulse peak, specific pulse energy, and compact structural design. Under such background, this article has launched to the new structure nanosecond-level pulse power research.
     First, the design idea of the pulse generator was explained which was used to eliminate algae. A topology configuration of pulse generator containing with Marx generator and magnetic switch was proposed. Marx generator generated a primary pulse, than the magnetic switch reshaped the primary pulse into the nanosecond level high voltage pulse.
     The charge structure of traditional Marx generator was improved. The model of charge circuit was established. The charge process was analyzed. The influence of different charge systems was summarized. The discharge process was computed, the model of discharge circuit with load established, and the influence of different load to the performance of Marx generator analyzed. Also the operational characteristics of magnetic switch was studied, the reshaping circuit analyzed and constructed by it which can be applied in steeping pulse and compressing pulse. Furthermore the influence of saturation process on pulse rising border was summarized.
     The charge and discharge circuit with computed parameters of Marx generator was simulated with the software of PSPICE was simulated. The influence of various parameter on pulse rising edge, charge efficiency, pulse peak were analyzed. The model of magnetic switch was established with the function of editing components in the software of PSPICE. The reshaping effect of magnetic switch was analyzed with simulation. Based on work above, stimulation of the single pulse and repetitive pulse was analyzed.
     Finally, the synchronization driving circuit of thyristor was designed. The hardware and software with the controller of ATmega8 was designed. The process and results of the experiment in laser laboratory was given.
     In this article, a kind of new structure pulse generator was designed under the increasing application and need of pulse generator with short rising edge and compact structure. Result of stimulation analysis proved the feasibility of such structure. This article of a new pulse generator can make a little contribution to the study on nanosecond-level pulse generator.
引文
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