电爆激励等离子体辐射光学弹药仿真研究

探索了一种利用金属丝电爆激励惰性气体产生等离子体强光辐射光学弹药的新机理,应用电爆丝绝热加热模型和惰性气体中电爆丝爆炸激励冲击波模型对电爆丝爆炸特性进行了理论分析和数值模拟.研究发现:为了获得强的脉冲辐射,应选用惰性气体作为发光工质,并且爆炸产生的冲击波速度越大越好;在常用的惰性气体中,Ar气最适合作为发光工质;同一电路参数下,银电爆丝在常见金属中爆炸性能最好,铜丝其次;存在一个最佳的电爆丝长度,大概在300 mm左右;而且电爆丝根数也有一个最优值,在20根左右.研究所得结论与实验结果符合较好,对红外脉冲强光弹药研究具有重要意义.     

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。     

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。     

红外、紫外基础与技术

0103643红外脉冲强光辐射源中电爆丝爆炸机理研究[刊]/张晓萍//国防科技大学学报.—2000,22(增3).—63～67(K)利用电爆丝的一种红外脉冲强光辐射新技术,从理论和实验上研究了电爆丝的爆炸机理。用电爆丝绝热加热模型数值模拟了电爆丝在冲击大电流作用下的电爆炸特性,电爆丝根数对电爆炸特性的影响。实验结果与理论模拟相一致。参20103644惰性气体中电爆丝爆炸激励冲击波的理论分析[刊]/张晓萍//国防科技大学学报.—2000,22(增3).—59～62(K)     

起爆方式对射频爆磁压缩发生器辐射性能的影响

射频爆磁压缩发生器的应用背景要求其具有较高的脉冲辐射功率,脉冲的频谱应在较高的频率范围内。基于信号的脉冲宽度与信号频带有近似反比的关系,文中提出了在射频爆磁压缩发生器中采用双端起爆和轴线起爆方式来压缩脉冲宽度,提高信号频率和脉冲输出功率。数值模拟结果表明,具有相同模型参数的射频爆磁压缩发生器,轴线起爆 与单端起爆方式相比,电流的脉冲宽度得到了压缩,从而提高了信号频率和脉冲功率,改善了装置的辐射性能。     

组合开关高功率脉冲调制电路的研究

采用环形电极结构的气体火花开关和电爆炸丝断路开关,研制了高功率脉冲调制电路。该电路通过压缩陡化爆炸磁频率发生器的输出而产生上升沿为纳秒级的宽频脉冲信号。结合球形和平面形结构电极,对环形电极脉冲陡化实验进行对比分析;根据电爆炸丝电阻率与比作用量的关系,在电路仿真软件Pspice中建立模型,并对电爆炸丝快速断路特性的数值仿真以及相关的实验研究;最后,进行了脉冲调制电路的实验,结果表明:在注入能量为35kV时,获得了上升沿为1.68ns、峰值为197kV的脉冲电压信号,压缩能量达到5倍以上,为下一步脉冲调制电路与爆磁压缩发生器的联合调试提供了理论依据和实验支持。     

爆炸磁频率发生器的等效电路分析

爆炸磁频率发生器是在螺旋磁累积发生器的基础上附加一小电容构成的.通过炸药爆炸使电感迅速减小,以此在螺线管中激发出强的振荡电流并在短时间内产生功率足够强的微波脉冲.基于等效电路理论,分析了该装置中电流的时间特性及产生微波脉冲的可能性.最后,分析了电流的频谱特性及其与电路参数的关系.     

100kJ级多路强电脉冲发生装置的同步精度技术研究

本文介绍了＂多路强电（磁）脉冲发生装置＂同步精度研究采用的每路输出＂储能电容＋同轴脉冲大电流火花开关放电＂型高压脉冲形成电路。用同轴电缆作为传输线将工作部件连接起来,以脉冲气体激光器作为终端负载（或其他负载,如磁脉冲线圈、电水锤等）组成多路相互隔离的强电脉冲充放电路,设计采用＂多路高压纳秒脉冲发生器装置＂进行同步精度触发,使高功率气体激光器的放电系统同时获得多路同步输出的高强电脉冲能量进行激励放电。同步精度装置的实验研究结果表明,多路同步导通强电脉冲能量已超出100kJ级,多路触发脉冲同步精度〈10ns,可为脉冲气体激光器提供更加超强激励触发能量获得高功率激光。     

零电压开关预燃电源的研究

本文提出了在脉冲氙灯预燃电路中将着火电压与预燃电流由不同电路来提供的设计思想 ,并采用了零电压开关技术。对逆变器的工作过程进行了数学分析 ,对功率开关管实现零电压开通的条件进行了讨论。实验证明该预燃电源在负载断路和短路情况下都能正常工作 ,功率开关管的开关损耗非常小 ,开关频率可达 10 0 k Hz,减小了电源体积 ,提高了电源效率 ,适用于各种尺寸的脉冲氙灯。     

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.     

Low Frequency Architecture for Multi-Lamp CCFL Systems With Capacitive Ignition

A low frequency architecture is proposed for driving parallel cold cathode fluorescent lamps (CCFLs) in large screen liquid crystal display (LCD) TV backlighting applications. Key to the architecture is a proposed capacitive coupling approach for aiding lamp ignition. A dc voltage is applied to the lamp electrodes while an ac voltage is applied to an external plate for capacitive coupling. The result is reliable, simultaneous ignition of parallel lamps with a required applied dc voltage near the lamp steady-state operating voltage. The complete system architecture includes a single high voltage converter, a pulse lamp ignition circuit, current control circuits and a single backlight controller. The topology is capable of driving a large number of parallel lamps with independent lamp current regulation, while avoiding ac coupling losses in steady-state operation and achieving significant reduction in reactive components when compared to typical high frequency ac ballast designs. Experimental results are presented for a system of four parallel 250 mm length lamps, demonstrating simultaneous parallel lamp ignition and dc current regulation.     

A Modified Valley Fill Electronic Ballast Having a Current Source Resonant Inverter With Improved Line-Current Total Harmonic Distortion (THD), High Power Factor, and Low Lamp Crest Factor

In this paper, a modified valley fill (VF) circuit is employed to combine with a current-fed resonant inverter as a passive high power factor (PF) electronic ballast. A conventional VF circuit limits the line current to conduct when the conduction angles are: 30deg les omegat les 150deg and 210deg les omegat les 330deg during the line period, which results in high total harmonic distortion (THD). The modified VF circuit has the following advantage: When the capacitors are connected in parallel, the voltage across the capacitors is one-third of the peak voltage, which allows the conduction angle of the line current to be further extended to 19.5deg les omegat les 160.5deg and 199.5deg les omegat les 340.5deg, so that a lower THD can be achieved. The high lamp crest factor (CF) problem generated by the high ripple voltage from the modified VF circuit is improved in the proposed ballast as variable frequency control is employed to continuously regulate the lamp current. An experimental prototype is then built in the laboratory to verify the feasibility of the proposed work for a 26-W compact fluorescent lamp. The final results confirm that a PF of 0.986 and a lamp CF of 1.49 are achieved with the proposed circuit, whereas a PF of 0.96 is achieved with the conventional VF ballast.     

脉冲氙灯瞬态放电电流诊断单元设计分析

脉冲氙灯瞬态放电电流诊断单元是惯性约束聚变(ICF)激光装置中能源系统的重要组成部分,基于对其面临的强电磁干扰、噪声耦合、多路并行采集电路拓扑约束等问题的分析,提出了一种多级隔离和基于现场可编程门阵列(FPGA)的多路并行架构的诊断单元设计方法,并依据该方法完成了样机研制。实验表明,诊断单元的电流测量范围为0~25 kA,采样率为200 kHz,测量准确度优于±0.5%,满足31 kV工作点电压下20路脉冲氙灯放电电流的同步诊断需求。相比传统设计,该方法具备更强的电磁兼容性和更高的并行采集设计集成度。     

晶体管恒流全新触发连续固体激光器的氪灯电源

介绍一种晶体管恒流全新触发连续固体激光器氪灯电源。先用一较高电压的辅助电源触发氪灯进入辉光放电 ,然后接通主电源 ,通过控制电路使氪灯自动过渡到弧光放电。为使氪灯正常工作电流恒定 ,光强稳定 ,采用晶体管恒流电路控制氪灯电流 ,从而使整机电路简化     

Starting control for series-resonant electronic ballast withrapid-start fluorescent lamp

A starting-aid circuit is added to the series-resonant electronic ballast for reducing the glow current in a rapid-start fluorescent lamp during the preheating. By controlling the operating frequency, the electronic ballast provides an adequate filament current for preheating with nearly zero lamp voltage     

固体激光器预燃电路的分析与设计

设计和分析了一种固体激光器预燃电路,该电路能有效提高激光电源的电光转换效率,预燃电路采用高压与低压组合供电,电源为近恒流源,高压部分使灯处于稳定辉光放电状态,低压部分提供灯的维持电流,这种高低压电源组合使预燃电路的效率大大提高。     

A high-frequency electronic ballast for HID lamps based on aλ/4-long distributed constant line

A novel type of solid-state ballast, which operates in the megahertz-range frequency, is presented in this paper. A circuit composed of a voltage-source half-bridge inverter, a distributed constant line and a parallel LC resonant circuit has been developed for this purpose. The high-intensity discharge (HID) lamp is connected to the output terminal of the inverter through the distributed constant line. Here, since the length of the line is adjusted to 1/4 of the propagation wavelength λ (λ/4 condition), the output voltage of the voltage-source inverter can be converted to a current source on the load side. Therefore, the ballast can supply not only high voltage to the HID lamp for initiating discharge, but also stable current to it during discharge condition. The modification of the proposed circuit is also proposed in order to expand the operating frequency without increasing the undesirable harmonic current. The experimental results from a prototype system verify the theoretical procedure     

脉冲功率电源中浪涌电流与电压的分析及抑制

针对功率脉冲电路放电过程中存在的电流和电压冲击问题,建立了电路的分布参数模型和二极管的PSPICE模型。分析了放电过程中的浪涌电流和电压的产生的机理,采用PSPICE软件对电路放电的瞬态过程进行了仿真,提出了抑制浪涌电流和电压冲击的方法。仿真结果表明:适当增加二极管回路的阻尼电阻,可以降低或消除浪涌电流;在二极管两端并上适当的电阻,可以降低浪涌电压。     

Improving crest factor of electronic ballast-fed fluorescent lampcurrent using pulse frequency modulation

In case where electronic ballast employing a valley-fill passive power-factor correction (PFC) circuit is used for feeding fluorescent tamps, a new method to reduce crest factor of the lamp current is studied in this paper. It is known that a 50% valley-fill passive PFC provided for high input power factor results in undesirable value of crest factor of the fluorescent lamp current, In order to reduce crest factor to a lower value, a pulse frequency modulation technique based on the waveform of the DC-link voltage which is predetermined by the passive PFC circuit is taken into the switching control action of the electronic ballast. An equation-based analysis between the crest factor of lamp current and the effect of varying the inverter switching frequency is comprehensively performed. Several simulation and experiment results illustrate the Effectiveness of the proposed control scheme