多道时间幅度变换电路的设计

介绍了一个多道时间幅度转换器(TAC)电路.它主要由起-停型时间幅度变换电路、放大电路、采样保持电路、积分控制电路、采样保持控制电路、判断电路等组成.其特点是精度高,速度快,电路简单,多通道,易与计算机数据获取和处理系统配合使用.可以广泛应用于大型探测器阵列前端电子学系统.     

多路开关式模—数变换电路

本文描述了基于高能物理实验需要研制的一种多路开关式快速模-数变换电路的设计考虑及其电路功能,较为详细地介绍了电路的工作原理,最后给出了实验结果与典型应用。     

大型集装箱检测系统管理站的任务需求分析与结构规划

由加速器周期性产生的Ｘ射线经前准直器成形为扇形脉冲束流，透过集装箱后再经过后准直器进入阵列探测器，再由前置放大器放大成形为电压信号送入采样保持电路，经多路选择器送去变换成为一组数字量，再经过一系列的预处理就可形成一列象素。由于集装箱是载于拖动装置上的，随着拖动装置的运动，这一列列的象素就可组成一幅完整的集装箱透视图，这样的一个完整过程由中心管理站统一控制和同步。本文介绍实时扫描数据获取与处理，并给     

576×6长波红外探测器多通道高速数据采集系统设计

设计了一个应用于线阵扫描型长波红外焦平面阵列的,高速,高精度,多通道数据采集系统。系统中的适配电路为探测器提供工作环境,并对图像信号进行缓冲和电平变换。采集电路完成模数转换和图像数据排序后,通过PCI接口板将数据上传至主机。对图像信号处理电路和精密偏置电压信号发生电路的动态性能及噪声性能给出了详细设计。使用两片异步静态存储器构建了图像数据排序电路。     

激光功率计的变换与显示电路

介绍了激光功率计的变换与显示电路,该电路的主要功能是直接指示激光功率的大小,该电路把由激光功率计输出的模拟电压量变为数字脉冲输出,并且把输出脉冲的频率实时显示出来。本电路具有精度高、线性好、工作稳定的特点。     

井下中子发生器电路研究

本文对Ｃ／Ｏ比（碳／氧比）井下中子发生器离子源电路的靶极高压电路进行了深入研究，结果表明：离子源电路采用反激式变换电路更合理，提出了确定靶极高压倍加电路最佳工作点的方法。     

改善ADC微分非线性的一种方法

根据放射性能谱测量的误差并不等于对单个脉冲测量的误差的特点,提出一种先测出模数变换器的道宽,然后利用软件方法进行道宽均匀的技术,利用这种可在不附加道宽均匀电路的情况下将已商品化的高速高分辨率单片模数变换集成电路用于能谱测量,这种方法也可校正由前置放大器,线性放大器,成形电路,峰展宽电路和模数变换电路等共同造成的微分非线性和积分非线性,最后,给出了这种方法的计算机模拟仿真的一些结果。     

576×6长波红外探测器多通道高速数据采集系统设计

设计了-个应用于线阵扫描型长波红外焦平面阵列的,高速,高精度,多通道数据采集系统.系统中的适配电路为探测器提供工作环境,并对图像信号进行缓冲和电平变换.采集电路完成模数转换和图像数据排序后,通过PCI接口板将数据上传至主机.对图像信号处理电路和精密偏置电压信号发生电路的动态性能及噪声性能给出了详细设计.使用两片异步静态存储器构建了图像数据排序电路.     

γ相机数据获取系统的模拟通道及模数变换电路…

本文介绍了γ相机数据采集的模数变换电路的组成及性能指标。     

γ相机数据采集接口的模拟通道及模数变换电路的研制

本文介绍了γ相机数据采集系统的模数变换电路的设计及性能指标。     

BES顶点探测器电子学系统

本文介绍了ＢＥＳ顶点探测器电子学系统的电路原理和它的功能，着重于时间数字转换器的技术性能，给出了某些电路框图，并涉及到ＢＥＳ顶点探测器替代中心漂移室的有利之处。     

Preliminary design of the ITER AC/DC converters supplied by the Korean Domestic Agency

The preliminary design for ITER AC/DC converters under the responsibility of the Korean Domestic Agency is performed on the basis of the engineering experience of previous R&D for a full-scale 6-pulse CS (Central Solenoid) converter unit. This paper describes key features of the preliminary design for the respective sub-systems; integrated self-supporting aluminium structure and symmetrical thyristor assembly for strong and reliable converters, optimised impedance of the converter transformer to limit short circuit current, coaxial-type AC bus bars to shield high magnetic field around wall penetrations, compact components to fit into given building space. The insulation and the minimisation of electrical loops of concrete rebar below the converter installations are essential to prevent floor heating. Required output voltage or current of converters is provided by a conventional controller. A master controller is designed to collect predicted reactive powers from each converter and deliver processed data to the reactive power compensation (RPC) system to improve the regulation speed of the RPC controller with fast feed-forward compensation under fast reactive power transients.     

Coupling model of AC filter branch in SF6 circuit breaker during the break process

In this paper, a coupling model of the AC filter branch circuit with the arc plasma in the circuit breaker was built to investigate the arcing process considering the harmonic current. The comparisons among the current at power frequency (50 Hz), power frequency combining the 11th harmonic and power frequency combining the 24th harmonic show that the high-order harmonic current would lead to higher decreasing rate of current before current-zero period. In addition, the influence of arc on the amplitude of high-order harmonic current is not negligible. Thus, the coupling of arc with AC filter branch circuit is quite necessary in the numerical modeling of the circuit breaker in the AC filter branch at the high voltage direct current converter station.     

Effects of electron radiation on commercial power MOSFET with buck converter application

Microelectronic power converters such as buck and boost converter are required to be tolerant to radiations including electron radiation.This paper examines electron radiation effects on the Ⅰ-V characteristics of VDMOSFET and its corresponding effects in buck converter.Analysis of the electrical characteristics shows that after irradiation the threshold voltage and drain current for all VDMOSFETs degraded more than two orders of magnitude.The impact of this electrical degradation has been investigated in an application of typical buck converter circuit.The buck converter with n-channel switching transistor shows that after irradiation its output voltage increased with the drain current in the n-channel ZVN4424A VDMOSFET,while the buck converter with p-channel switching transistor shows its output voltage decreased with the drain current in the p-channel ZVP4424A VDMOSFET after irradiation.     

Effects of electron radiation on commercial power MOSFET with buck converter application

Microelectronic power converters such as buck and boost converter are required to be tolerant to radiations including electron radiation. This paper examines electron radiation effects on the Ⅰ-Ⅴ characteristics of VDMOSFET and its corresponding effects in buck converter. Analysis of the electrical characteristics shows that after irradiation the threshold voltage and drain current for all VDMOSFETs degraded more than two orders of magnitude. The impact of this electrical degradation has been investigated in an application of typical buck converter circuit. The buck converter with n-channel switching transistor shows that after irradiation its output voltage increased with the drain current in the n-channel ZVN4424 A VDMOSFET, while the buck converter with p-channel switching transistor shows its output voltage decreased with the drain current in the p-channel ZVP4424 A VDMOSFET after irradiation.     

On the Circulating Current Control of ITER Poloidal Field Converter

The dynamic behavior of circulating current control of International Thermonuclear Experimental Reactor poloidal field converter is the subject of this investigation. Four quadrants operation with circulating current has proved to be a reasonable way to perform smooth transition at the zero crossover of load current. In this paper, a control method, specially for circulating current control, on the basis of equivalent circuit, is proposed. With simulations it is verified that the circulating current can be controlled in such a way that it never become zero, and load current can change polarity without any discontinuity and dead zone, even if in the case that the total reference voltage of converter changes rapidly.     

The Circulating Current Analysis and Parameter Design of Interphase—Reactor of HT—7U Toroidal Power Supply

This paper analyzes the circulating current which is produced by HT-7U superconducting toroidal power supply-two sets of two-reverse-star converter with an interphase-reactor in parallel running on the basis of the output voltage mathematical equation of three-phaase semi-wave converter circuit.A new iden of omitting interphase-reactor between two converters is proposed,and the parameter design of interphase-reactor of HT-7 toroidal power supply is presented.Simulated results demonstrate the validity of this new project.     

数字电源控制模块中AD/DA板设计

介绍了一种用于数字电源控制模块(DSPCM,Digital Power Supply Control Model)的AD/DA转换电路设计,主要包括电路的原理设计,PCB设计以及在电路设计过程中对于选取ADC/DAC的选型和PCB布局布线的考虑,最后给出功能测试的结果及分析。     

单次脉冲毫微秒时间测量

一、引言近年来,测量快的脉冲事件之间时间间隔基本上有三种方法,即直接计数法,模拟法和混合法。其中模拟法是基于电容器充放电原理,包括时间-时间扩展和时间-幅度变换方法在内。比直接计数法时间分辨好,如果把时间-幅度变换器和多道分析器结     

电压频率转换器在诊断X射线检测中的应用

根据诊断X射线检测的设计要求,结合STM32单片机的特点,将电压频率转换器应用到诊断X射线检测系统中。分析了电压频率转换器的工作原理,给出了电压频率转换器电路设计及诊断X射线检测系统的硬件构成,并对检测系统的控制程序流程进行详细的说明。电压频率转换器具有设计简单、低成本、高精度、应用灵活等特点,适合于低速数据采集。