磁脉冲开关在准分子激光器中的应用

本文介绍了用于准分子激光器中的磁脉冲压缩开关的原理和结构，分析了磁脉冲压缩开关在激光器激励电路中的工作过程，并且给出了实验结果。实验表明，磁脉冲压缩开关有效地压缩电流脉冲宽度，对激励电路中的闸流管起到保护作用。     

带磁开关的冲击-自持脉冲放电技术及其应用

本文通过对带磁开关的冲击-自持脉冲放电电路放电过程的分析,指出了该电路在激发准分子激光时的优点,在考虑准分子激光形成过程特点的基础上,进一步指出了利用该电路有利于制成高效率、高功率、长脉冲准分子激光器件.     

金属蒸气激光脉冲放电电路的模拟比较

通过对脉冲放电金属蒸气激光放电管等离子体电阻和闸流管的开关特性的实验测量和数学拟合,给出了两者阻抗随时间变化的指数关系式,进而模拟并测量了谐振倍压电路和Blumlein电路的放电脉冲波形以及闸流管开关时间对放电特性的影响,得到了和实测波形相一致的理论模拟结果。表明,这种模拟方法对激光器实现高效脉冲放电起到辅助设计的作用。     

磁脉冲开关在准分子激光器中的应用

本文介绍了用于准分子激光器中的磁脉冲压缩开关的原理和结构，分析了磁脉冲压缩开关在激光器激励电路中的工作过程，并且给出了实验结果。实验表明，磁脉冲庄缩开关有效地压缩电流脉冲宽度，对激励电路中的闸流管起到保护作用。     

利用可饱和电感延长准分子激光器中闸流管的使用寿命

在分析影响闸流管寿命诸因素的基础上，讨论了利用磁助器延长闸流管使用寿命的原理和方法，并在准分子激光器中设计和使用磁助器，较好地解决了高压快放电中开关器件——闸流管使用中存在的问题，从而有利于延长其使用寿命。     

准分子激光器中磁脉冲压缩技术的研究

本文从实用准分子激光放电要求出发，研究了适用于准分子激光器的磁脉冲压缩器，分析了其工作过程，并对其设计构思、设计参数进行了分析和计算。     

掺氢溴化亚铜激光器动态阻抗的研究

重点用固定比例的氖氢混合气体研究和比较了掺H前后激光器的光电脉冲波形和等离子体动态阻抗.实验装置采用普通倍压充电通过闸流管放电电路.放电电压用Tektronix P6015A高压探头跨接于激光放电管电极测量(阳极接地),放电电流用Pearson Model 410 脉冲电流转换器套接在激光放电管阳极引线上探测,快响应光电二极管测光脉冲波形.实验分别在纯氖气和掺H 2%、2.5%的氖氢混合气体稳定流动的情况下进行,激光器稳定工作时,测量激光管电压和电流波形,以及激光脉冲波形,同时记录采样数据.实验结果表明,掺入2%的氢使放电激励的电压幅度增加了约34%,而电流脉冲幅度却下降了约23%,激励阶段激光放电管的等离子体阻抗增加了约3倍;光脉冲宽度明显增大. 我们认为H的加入改变了放电的微观过程,使得激光放电管中等离子体阻抗增加.再深入的研究表明 H对电子有很强的可剥离吸附作用,在放电余辉期,H吸附了大量的电子,导致电子密度减少,等离子体电阻增加,使激发态原子和离子能快速地消激励.(PC1)     

PC全固态激光器及各类新型激光器

掺氢溴化亚铜激光器动态阻抗的研究 *陈　钢　潘佰良　姚志欣(浙江大学物理系 ,杭州 310 0 2 7)重点用固定比例的氖氢混合气体研究和比较了掺 H前后激光器的光电脉冲波形和等离子体动态阻抗。实验装置采用普通倍压充电通过闸流管放电电路。放电电压用 Tektronix P60 15 A高压探头跨接于激光放电管电极测量 (阳极接地 ) ,放电电流用 Pearson Model 4 10脉冲电流转换器套接在激光放电管阳极引线上探测 ,快响应光电二极管测光脉冲波形。实验分别在纯氖气和掺 H2 %、2 .5 %的氖氢混合气体稳定流动的情况下进行 ,激光器稳定工作时 ,测量激光管…     

Simulink仿真指导放电准分子激光长脉宽的实验探究

针对医疗用308 nm准分子激光器长脉宽的实际需求,提出Simulink仿真模型指导延长激光脉宽的方案,并进行实验研究。首先建立并验证了典型准分子激光器放电激励回路仿真模型的有效性,其次基于脉冲形成网络原理建立4级LC峰化回路的放电激励模型,并进行了具体的激光器结构设计和参数选择。对一台储能电容为60 nF,工作电压范围在20~29 kV的308 nm准分子激光器进行实验,通过改变激励回路的结构和参数,激光脉宽由30 ns延长到60 ns,且当储能电容电压值为28 kV时,输出能量达407 mJ,激光脉冲能量的转移效率由典型结构的1.531%提高至1.73%,实现了放电激励308 nm准分子激光长脉冲输出条件下的高能量转移率,验证了Simulink仿真模型的有效性和指导意义,为实用化长脉宽准分子激光的设计和应用提供基础。     

鳃、钙离子复合激光激励电路的分析

对Sr^ 、Ca^ 复合激光所用的Blumlein电路的放电过程和脉冲波形进行了计算机模型。在相同电路参数时,经模拟得到的放电管电流脉冲波形和实测的波形相一致。给出了该电路中各元件上放电脉冲波形间的时间关系,明确了放电过程的先后次序以及对应放电管的击穿电压和时刻。计算和比较了不同电路参数组合时流过放电管的电流脉冲波形,按照复合激光对放电电流脉冲后沿的要求,获得了一组较佳的电路参数。     

磁脉冲压缩开关在钛宝石激光器中的应用分析

首次提出了将磁脉冲压缩开关应用于钛宝石激光器中,由磁脉冲压缩开关和闸流管组合作为放电开关.给出了一种新型的灯泵钛宝石激光器电源放电电路,并对磁脉冲压缩开关应用的原理及在激光器激励电路中的工作过程进行了分析.     

小型磁脉冲压缩器在铜蒸气激光器上的应用

介绍了一种用小镍-锌磁杯组成的小型磁脉冲压缩器,并将它成功地用于铜蒸气激光器电路中。同时给出了它的基本原理和理论设计,并且对实验结果进行了分析。     

一种新颖钛宝石激光器电源电路

介绍了一种灯抽运钛宝石激光器电源充放电电路。利用脉冲能量进行变压器升压式充电,用磁脉冲压缩开关替代了传统灯抽运钛宝石激光器电源中的放电开关闸流管,并对整个电路的工作过程进行了分析。     

Analysis of the Transient State in a Series Circuit of the Class $$RL_{\beta }C_{\alpha }$$

Results of analysis of transient states in a series circuit of the class \({RL}_{\beta }{C}_{\alpha }\), supplied by an ideal voltage source, have been described in the paper. This circuit consists of a coil \({L}_{\beta }\) and a supercapacitor \({C}_{\alpha }\) described by fractional-order differential equations. A method for determining the current and voltage waveforms in the analyzed circuit, based on the decomposition of rational functions into partial fractions, has been described. This method allows to determine transient waveform shapes in the system for any kind of voltage excitation. Two cases of the problem solutions have been considered. The first case concerns a situation where poles of rational functions are real, and the second where rational functions have complex poles. Effective relations enabling the determination of transient waveforms in a closed form have been given. Analytical formulae describing transient state waveforms in the system for different types of voltage excitations: constant, monoharmonic, periodic and arbitrary being an element of a Hilbert space, have been determined, too. The obtained results have been illustrated by an example.     

Performance evaluation of a MPPT controller with model predictive control for a photovoltaic system

ABSTRACT

Efficiency has been a major factor in the growth of photovoltaic (PV) systems. Different control techniques have been explored to extract maximum power from PV systems under varying environmental conditions. This paper evaluates the performance of a new improved control technique known as model predictive control (MPC) in power extraction from PV systems. Exploiting the ability of MPC to predict future state of controlled variables, MPC has been implemented for tacking of maximum power point (MPP) of a PV system. Application of MPC for maximum power point tracking (MPPT) has been found to result into faster tracking of MPP under continuously varying atmospheric conditions providing an efficient system. It helps in reducing unwanted oscillations with an increase in tracking speed. A detailed step by step process of designing a model predictive controller has been discussed. Here, MPC has been applied in conjunction with conventional perturb and observe (P&O) method for controlling the dc-dc boost converter switching, harvesting maximum power from a PV array. The results of MPC controller has been compared with two widely used conventional methods of MPPT, viz. incremental conductance method and P&O method. The MPC controller scheme has been designed, implemented and tested in MATLAB/Simulink environment and has also been experimentally validated using a laboratory prototype of a PV system.     

UWB无线电脉冲波形设计研究

研究超宽带无线通信系统的超短脉冲波形的设计问题,基于FCC频谱约束条件给出超宽带脉冲波形的优化设计方法。提出通过不同高斯波形的适当叠加方法给出简单而性质良好的脉冲波形,其次基于滤波思想给出性态灵活的脉冲波形设计方法。实验表明,本方法十分有效。     

异步时序逻辑电路的设计方法探讨

在传统的同步时序电路设计方法的基础上,提出了一种新的异步时序电路的设计方法。该方法直接从时序电路的时序波形图,获得触发器的触发脉冲;根据时钟信号作用下引起的状态转换,填写次态卡诺图。其特点是原理简单,易于理解,使设计更加直观清楚。     

Measurements of the voltage induced on an overhead power line 20 mfrom triggered lightning

Voltages induced on a 448-m power distribution line by eleven return strokes in three lightning flashes artificially initiated 20 m from one end of the distribution line and the corresponding vertical electric fields at 500 m have been measured. Two types of induced-voltage waveforms were recorded: oscillatory and impulsive. The former exhibit peak values that range from tens of kilovolts to about 100 kV; the latter show peak voltages nearly an order of magnitude larger. Both types of induced voltage waveforms were observed to occur for different strokes within a single flash. Relatively successful modeling of the oscillatory voltage waveforms is presented. Modeling of the impulsive waveforms proved unsuccessful, probably due to those waveforms being in part associated with a failure, perhaps an unexpected flashover, in the measuring system