用于激光器的电感储能发生器

研制了适用于激光器的电感储能发生器(GIES),并研究了它在高压混合气体中的放电和激光参数.研究表明,电感储能发生器可产生高压预脉冲并引起放电电流的突然增大,可在不同的混合气体中形成长时间的稳定放电,从而方便地控制和优化每一种气体混合物的预脉冲参数.在未知IES击穿电压和首次放电幅度下的参数时,电流尖峰会按因子1.5-...     

程控高压脉冲发生器

介绍一种程控高压脉冲发生器,主要由高压电源、储能电容器组、氢闸流管和控制电路等组成,可以输出一个负极性的高压脉冲,脉冲幅度为10～15kV。程控高压脉冲发生器采用模块化设计结构,将通用的构建于模拟电路基础之上的高压脉冲发生器与数字控制技术相结合,通过触摸屏、可编程控制器PLC加以控制,实现仪器的智能化。     

干式变压器风冷系统在线监测与温控保护装置

针对传统干式变压器温控保护装置对风机运行状态缺乏有效监测的不足,设计实现了以STM32F103为控制器核心的新型干式变压器温控保护装置。提出基于离散傅里叶变换实现对风机运行状态参数在线监测,阐明实现风冷系统故障诊断的判据与温控保护策略,并给出电压电流采样电路、三线桥式温度采样电路及相应的信号调理电路设计。该装置具有风机电源电压、电流等全电量参数及温度监测、系统控制、状态诊断、保护预警、数据存储、远程通讯等功能。     

基于CAN总线与射频技术的高压开关柜温度监测系统

为方便、可靠、实时地对变电站高压开关柜内温度进行监测,研制了一种基于CAN总线及射频技术的温度监测系统.利用nRF2402及DS18B20作为无线温度传感器的主要器件实现开关柜内节点温度的采集、传输,以基于nRF2401射频芯片及独立CAN控制器芯片MCP2510的无线温度采集器完成对各温度传感器数据的接收及其与上位机的通讯,从而实现对高压开关柜内各节点温度的监测及报警.此系统在某110 kV变电站实际运行证明:系统抗干扰能力强、温度监测准确、可靠,满足高压开关柜温度监测要求.     

煤矿高压电缆绝缘在线监测与诊断系统设计

针对矿井高压电缆的老化机理进行分析,发现局部放电脉冲信号可直观的反映出电缆的老化程度.利用差分法搭建耦合装置测量电缆局部脉冲信号,通过小波阈值去噪法,对测量到的脉冲信号进行去噪,提高数据的精确度,搭建在线监测系统,对数据采集模块与信号传输模块进行选型设计,利用光纤通讯网络将信号传输到上位机,实现高压电缆绝缘状态的远程在线监测与诊断,并为电缆的检修与更换提供数据参考.     

基于ARM的低压配电在线监测控制器的设计

基于ARM芯片的低压配电在线监测控制器有较高的性价比和实用意义.监控器硬件设计要考虑三相电压电流信号的采集,确保测量精度,与所设计的软件配合可支持数据通信,保存要求记录的各种重要数据,掉电保护等.软件设计要考虑数据采集、键盘处理、数据通信、故障处理、输出控制信号等.还讨论抗干扰滤波设计,提出的算法对脉冲噪声的滤除效果十分明显,具有理论和实际价值.     

二万安培可控整流稳压电源

随着电解加工工艺的发展,对整流电源提出了新的要求,如加大电流容量、提高稳压精度、减小电网的影响、提高供电效率和提高工作可靠性等。本文介绍的二万安培可控硅调压稳压直流电源采用整流变压器一次高压供电(10千伏),二次可控硅整流调压的工作线路。可控硅的触发脉冲发生器采用高线性度锯齿波与可控直流电压比较的脉冲移相方法和单稳脉冲整形电路。本电源为闭环有差调节稳压系统,稳压精度可控制在0.5%范围内。该电源在零到额定电压的范围内可连续平滑调节,并可在额定的电流范围内频繁起动与停止。 一、工作原理 1.整流和调压 本电源采用双…     

一种诱导肿瘤细胞凋亡的多参数可调高压纳秒脉冲发生器

为了研究纳秒脉冲电场诱导肿瘤细胞的凋亡效应及其窗口参数选择规律,本文结合脉冲功率技术和Blumlein集中参数LC网络脉冲形成线原理,研制出了一台医用多参数可调、便携式、智能型高压纳秒方波脉冲发生器。该发生器主要由高压直流电源、纳秒脉冲形成系统和脉冲整形及计数系统三部分组成,输出脉冲幅值4～15kV连续可调,脉宽50～500ns可变,上升沿最小10ns,重复频率可调,治疗时间窗口可控,并具有液晶显示和保护功能。以人浆液囊腺性卵巢癌SKOV3为研究对象,正交设计出多种脉冲参数组合进行实验分析,探索出肿瘤细胞凋亡率较高的脉冲治疗窗口参数。医学实验表明:发生器紧凑、轻便、性能稳定,有效满足了纳秒脉冲电场诱导肿瘤细胞凋亡的机理及窗口参数选择的研究需要。     

高压脉冲电流光电测试系统设计及其标定

对120kV的单次高压脉冲电流,不能直接采用示波器电流探头进行直接测量.为解决此问题,笔者提出采用光电转换技术成功开发高压高速单次脉冲电流测试系统,有效解决了存在的问题,提高了系统的抗电磁干扰能力.同时在该测量系统标定时,利用脉冲信号源和示波器的电流探头进行测量,得到一组电流脉冲-示波器读数(I-V)校正数据,用这组数据绘制一换条校正直线.这里介绍系统的设计和标定情况并利用最小二乘法进行数据的直线拟合,得到一条拟合直线,并对残差和标定误差进行了估算.     

基于雪崩三极管的高压方波脉冲发生器研究

测试与测量领域对快前沿脉冲发生器的需求越来越高,特别是要求产生高重复频率和高电压的快脉冲。本文使用串行雪崩三极管开发了一种低成本的便携式高重复频率高压纳秒方波脉冲发生器。通过优化设计串行晶体管电路和PCB,有效降低杂散电感和电压反射,使输出方波脉冲获得2.5ns的上升时间,幅度输出脉冲2.5kV,脉冲宽度为12.5ns。高压脉冲发生器在10kHz的高重复频率工作模式下,脉冲时间抖动小于100ps。     

A compact, low jitter, nanosecond rise time, high voltage pulse generator with variable amplitude

In this paper, a compact, low jitter, nanosecond rise time, command triggered, high peak power, gas-switch pulse generator system is developed for high energy physics experiment. The main components of the system are a high voltage capacitor, the spark gap switch and R = 50 Ω load resistance built into a structure to obtain a fast high power pulse. The pulse drive unit, comprised of a vacuum planar triode and a stack of avalanche transistors, is command triggered by a single or multiple TTL (transistor-transistor logic) level pulses generated by a trigger pulse control unit implemented using the 555 timer circuit. The control unit also accepts user input TTL trigger signal. The vacuum planar triode in the pulse driving unit that close the first stage switches is applied to drive the spark gap reducing jitter. By adjusting the charge voltage of a high voltage capacitor charging power supply, the pulse amplitude varies from 5 kV to 10 kV, with a rise time of <3 ns and the maximum peak current up to 200 A (into 50 Ω). The jitter of the pulse generator system is less than 1 ns. The maximum pulse repetition rate is set at 10 Hz that limited only by the gas-switch and available capacitor recovery time.     

基于 CPLD的双通道高压脉冲信号源

针对声波测井压电陶瓷换能器容性大的负载特性,采用单片机和CPLD相结合的方式设计了一种输出幅度高、驱动电流大、脉冲宽度可调的双通道高压脉冲信号源。系统利用C8051F350单片机及PWM控制芯片MM33060A,并结合自耦变压器反激式升压电路将12 V直流供电电压抬升至300 V。采用CPLD产生精确的频率可控的300 V脉冲电压,利用脉冲变压器进一步提升电压,得到了上千伏的高压激励脉冲。实验结果标明,设计的信号源在激励压电陶瓷换能器时,负载上得到了比较理想的波形,波形上升沿陡峭,无拖尾及振荡现象,满足实际应用需求。     

A high-current pulse generator for gas discharge pumping

A generator has been designed for pumping a pseudospark gas discharge in xenon with the aim of generating UV radiation at a wavelength of 13.5 nm. The output parameters of the generator are as follows: the pulse energy is 10 J, the voltage is 6 kV, the peak current when short circuited is 40 kA, the base current pulse duration is 200 ns, and the frequency is as high as 500 Hz.     

A generator for calibrating current and voltage probes of the Angara-5-1 facility

A small-size high-voltage generator forming single pulses is described. The generator contains reference current and voltage probes and is intended for calibrating current and voltage probes placed in the electromagnetic-pulse transmission section and loading unit of the Angara-5-1 facility. When the charging voltage is at maximum (40 kV), the current amplitude in the short-circuit mode is ～28 kA. The half-height current pulse duration is ～140 ns.     

Machining characteristics of micro EDM in water using high frequency bipolar pulse

Micro EDM using conventional pulse generators such as the RC type or transistor type with water as the dielectric fluid suffers from poor accuracy of machined structures due to electrolytic corrosion. In this study, a new high frequency bipolar pulse generator for micro EDM in water was developed in order to prevent electrolytic corrosion. The new pulse generator produced a high frequency bipolar pulse possessing a positive pulse duration of several hundred nanoseconds with a high repetition rate provided to the machining gap. Discharge characteristics of micro EDM using the new pulse generator were investigated. Machining characteristics were also investigated according to machining conditions such as the repetition rate, positive voltage, capacitance and resistivity. Using the new pulse generator, micro holes without electrolytic corrosion were successfully fabricated in deionized water and tap water. Machining time, tool wear and clearance using the new pulse generator in deionized water decreased compared with those using the RC circuit in kerosene.     

A Multichannel Automatized System for Measuring Current Pulses in the LIA-30 Electron Accelerator

In the LIA-30 high-power linear pulsed induction electron accelerator (40 MeV, 100 kA, 25 ns), the energy is stored, and pulses of the accelerating voltage are shaped by 288 water-insulated radial lines arranged in succession along a common air-free acceleration channel. The lines are simultaneously charged up to 500 kV from 72 shielded Marx generators. To measure the parameters (amplitude, pulse shape, pulse rise time, pulse fall time, and pulse duration) of the synchronized pulses of the charging current with amplitudes as high as 60 kA and duration of 0.85 s in each of the 72 charging circuits, an automatized measuring system is used. The current pulse is sensed at the output of each generator by a self-integrating Rogovsky coil galvanically isolated from the generator. The signal from the coil is transmitted over a cable to an analog-to-digital converter, sampled with a period of 50 ns, and recorded in memory. Upon operating the accelerator, the signals are reproduced in succession or selectively on the display screen, and their shapes are compared to the shape of a standard pulse.     

High voltage pulse shaping of e-beam diode using perveance variation

This paper presents a new high voltage pulse shaping methodology for pulsed power applications. The aim is to generate high voltage square pulse across anode cathode gap of e-beam diodes. The non-linear time varying perveance characteristics of e-beam diodes are used for shaping of output voltage pulse across it, generated directly from Marx generator. Analytically, it has been shown in the paper that under certain conditions, if achieved, Marx generator feeding an e-beam diode can produce a square-like pulse at the output, without any extra pulse shaping arrangements. Experimental results to support the analysis are also presented in the paper.     

能量可控陡脉冲肿瘤治疗仪的研制

利用高强度陡脉冲对恶性肿瘤细胞的不可逆性电击穿的特点，将现代电力电子技术应用于高压陡脉冲发生器的设计中，研制了一套能量可控高强度陡脉冲肿瘤治疗仪及其计算机测控系统。仪器的脉冲频率、脉冲宽度和脉冲峰值独立可调，从而实现了对输出能量的控制，满足了肿瘤治疗离体实验的要求，为进一步的肿瘤细胞实验和动物实验打下了基础。     

A high-voltage nanosecond pulse generator based on a barrier discharge

One of the specific features of the barrier electric discharge is the short duration of microdischarge processes that last about tens of nanoseconds. A high-voltage nanosecond pulse generator based on a barrier electric discharge is presented. A voltage of tens of kilovolts is usually applied to electrodes of the discharge cell. The peak values of the current pulse may be very high (from a few amperes to several tens of amperes). The presented high-voltage nanosecond pulse generator, having a sufficiently simple design, ensures quite good pulse repetition stability, and, when necessary, allows one to easily tune characteristics of pulses and their repetition rates by changing the geometrical, electrical, and physical-chemical parameters of the setup.