A Switch Based on Reverse Switch-on Dynistors with a Diode Sharpener of Switched Current Pulses

A principle of constructing a combined semiconductor switch based on a diode assembly and an assembly of reverse switch-on dynistors (RSDs) is considered. The diode assembly serves as a sharpener of current pulses switched by the RSD assembly. The results of tests of a combined switch, which forms 3.5-kV voltage pulses with a duration of 1 s and a rise time of 10 ns at a load of 10 , are presented. Ways of enhancing the switching capabilities of RSD switches with diode sharpeners are presented.     

A High-Voltage Reverse Switch-on Dynistor Switch with a Control Circuit Based on Magnetic-Compression Sections

A high-voltage switch of submicrosecond range based on an assembly of reverse switch-on dynistors (RSDs) connected in series and a coaxial saturable-core choke is described. Dynistors are triggered using a control circuit in the form of a high-voltage magnetic-compression section, in which the current-forming capacitor is charged from the power-circuit capacitor using an additional low-power saturable-core choke. The results of tests of a small-sized (200 × 200 × 55 mm) RSD switch with an operating voltage of 6 kV switching 1-kA current pulses with a 600-ns duration are presented. Low switching energy losses in dynistors make it possible to use devices with a 12-mm diameter of the structure in the RSD assembly. Their temperature was within 20°C at a switching frequency of 100 Hz.     

A High-Voltage Reverse Switch-on Dynistor Switch with a Transistor Control Circuit

A high-voltage switch based on an assembly of reverse switch-on dynistors (RSDs) connected in series is described. In this device, the dynistors are triggered by the current, which is formed using parallel control transistor circuits and low-power shunting capacitors. The results of tests of a high-voltage (10 kV) RSD switch in the regime of switching high-power (6 kA) and short (1.5 s) current pulses are presented. The switch reliably operated under experimental conditions at a frequency of 300 Hz with very low energy losses in small-sized dynistors with a 24-mm-diameter structure (their heating was under 55°C).     

Formation of High-Power Pulses of Nanosecond Duration by Generators on Reverse Switch-on Dynistors with Sharpening Circuits Based on Diode Opening Switches

The basic principles of constructing generators of nanosecond pulses on reverse switch-on dynistors with sharpening output circuits based on diode opening switches are considered. The results of an experimental study of a high-power generator incorporating such a dynistor; a step-up pulse transformer; and a high-voltage diode opening switch, which is an assembly of drift step-recovery diodes connected in series, are presented. The output voltage pulses of the generator with an amplitude of 45 kV, a duration of 50 ns, a rise time of 10 ns, and a repetition rate of 1 kHz are applied to a load resistance of 25 .     

Switches of Powerful Nanosecond Current Pulses Based on High-Voltage Units of Shock Ionized Dynistors

Instruments and Experimental Techniques - Monounit and modular switches of high-power current pulses with an operating voltage of 12 kV, made on the basis of series-connected shock ionized...     

High-Power Pulse Devices for Studying Reverse Switch-On Dynistors

Instruments and Experimental Techniques - Two high-power pulsed devices that are designed for studying reverse switch-on dynistors (RSDs) with a diameter of structures of up to 80 mm in...     

A Unit of Shock-Ionized Dynistors with a High-Voltage Pulse Sharpener in the Control Circuit

Instruments and Experimental Techniques - The results from studies of a high-voltage unit of shock-ionized dynistors in the switching mode of current pulses with an amplitude of several kiloamperes...     

Switching Possibilities of Reverse Switched-on Dynistors and Principles of RSD Circuitry (Review)

The results of studies of reverse switched-on dynistors (RSDs) intended for use in high-power pulse and converting devices are generalized. The basic principles of designing high-power RSD switches are analyzed. The main circuit designs of pulse and high-frequency RSD-based devices are described. The results of tests of high-voltage microsecond and submicrosecond pulse RSD generators with a pulse power of 10⁸–10¹⁰ W and high-frequency RSD inverters with a mean power of 10⁴–10⁵ W are presented.     

Investigation of Reverse Switch-On Dynistors Upgraded for Reducing the Energy Loss when Switching Reverse-Current Pulses

The results of investigations of new semiconductor devices, reverse switch-on dynistors dynistors–diodes (RSDDs), with an operating voltage of 2 kV and a 50-mm diameter of the structure are presented. Their comparison with conventional RSDs shows that the losses in RSDDs are approximately 2 times lower when high-power reverse-current pulses are switched, the losses are virtually the same during switching, and the losses are 15–20% higher when switching rapidly rising forward-current pulses. The limiting abilities of RSDDs are determined when switching unipolar current pulses with a duration of 300 μs: 30 and 100 kA in the reverse and forward directions, respectively. The possibility of reliable switching of alternating slowly damped current pulses with a duration of 40 μs and amplitudes of the first forward and reverse half-waves of 90 and 65 kA, respectively, with which conventional RSDs cannot operate, is shown.     

一种基于断层测量的反求工程

断层测量技术能同时测量物体的表面和内腔尺寸 ,在反求工程中具有较好的应用前景。现有方法如 CT和 MRI的测量精度较低 ,且成本很高。针对上述问题 ,研究了一种基于层去图像法的断层测量系统 ,并给出了它在反求工程中的应用     

A Nanosecond High-Voltage Periodically Pulsed Generator Based on a Helix Forming Line

A nanosecond high-voltage periodically pulsed generator based on a helix forming line is described. The line is charged from a high-coupling Tesla transformer. Compared with a conventional coaxial line, the helix line provides a fourfold increase in the generator impedance and pulse width without a significant increase in the generator dimensions, with the energy stored remaining the same.     

A Generator of Powerful Nanosecond Pulses Based on a Module of Drift Step Recovery Diodes and a Module of Shock-Ionized Dynistors

Instruments and Experimental Techniques - A small-sized, high-efficiency nanosecond pulse generator with an output energy of ~400 mJ has been developed based on a module of drift step recovery...     

A High-Voltage Switching Device Based on Two High-Current Vacuum Gaps Connected in Series

A high-voltage switch that consists of two -43 triggered vacuum spark gaps connected in series has been manufactured and tested. The switch is intended for use at a voltage of up to 80 kV. The maximum current switched is 200 kA. The breakdown strength of the switch has been theoretically and experimentally investigated. Experimental and theoretical breakdown-voltage distribution functions have been obtained for the gaps and the switch. Based on the empirical breakdown-voltage distributions for both of the gaps, the breakdown-voltage distribution for the switch has been calculated and found to be in satisfactory agreement with the measurement results.     

A High-Voltage High-Frequency Subnanosecond Pulse Generator Based on Gallium Arsenide Drift Step-Recovery Diodes

Instruments and Experimental Techniques - The prospect of using high-voltage GaAs drift step-recovery diodes for the formation of subnanosecond pulses is shown. The electrical circuit of a...     

高精度高压电压表

本文介绍的高精度高压电压表,是以标准电压通过电容系统比较分压电阻的电压降,避免分压电阻表面漏电流对测量精度的影响。电压测量的相对误差<10~(-4)。     

基于超模型的有载分接开关零部件的动力学模型确认

提出一种有载分接开关零部件的动力学模型确认方法。该方法以有限元超模型的分析结果为参考基准,采用基于灵敏度的优化方法对分接开关零部件的有限元简化模型进行修正,以获取与超模型动力学特性一致的简化模型,该模型可进一步用于建立分接开关的整机动力学模型。以分接开关底座的动力学建模为实例,对该方法进行了验证。该方法对工程中复杂结构的动力学建模具有广阔的应用前景。     

A High-Voltage Pulse-Packet Shaper

A high-voltage nanosecond-pulse shaper based on microcircuits and high-power MOS transistors is described. The output pulse amplitude is 5 to 300 V; at a 50- load, pulse duration is 100 ns; pulse rise time is 5 ns; pulse-repetition period in a packet is 100 s; packet duration is 10 ms, and packet-repetition period is 100 ms.     

基于VBA的机械手弧面分度凸轮的可视化研究

利用AutoCAD2000提供的二次开发工具VBA实现了加工中心自动换刀机械手上的多头多段弧面分度凸轮的三维实体造型。     

基于PLC的自动换刀系统研究

分析了链式刀库系统的运行过程,设计了一种基于PLC的自动换刀系统.利用三菱FX1N-40MT小型PLC输出指定数量的高速脉冲来驱动刀库的伺服电机 ;带动链式刀库旋转并定位.利用PLC控制电磁阀的作用,继而控制气缸的运动,实现了对刀具和刀套的翻转.重点介绍了刀库运行过程中刀具的定位、刀套的翻转及机械手换刀的控制.     

基于802D的盘式刀库自动换刀控制

阐述了自动换刀系统的重要性,分析了课题所用盘式刀库的结构和工作原理.在自动换刀的还刀和取刀子程序流程的基础上设计了本盘式刀库自动换刀所必须的输入输出点,并且对自动换刀程序中非常重要的就近选刀子程序和刷新当前刀号子程序进行了着重说明.