简述振铃检测电路及摘挂机电路在远程控制系统中的应用

远程多路智能控制系统可通过电话对家用电器、办公设备等装置进行远程控制,在一个远程多路智能控制系统中包含着多个外围电路,如振铃检测电路、摘/挂机控制电路、DTMF信号收/发电路、电源电路等,本文将着重介绍振铃检测电路、摘/挂机控制电路在整个远程多路智能控制系统中的设计思路.     

家电远程控制器的设计

通过单片机编程实现远程控制家用电器。该设计是以ATB9c2051芯片为核心芯片,进行主要的信息处理,通过电话线路遥控实现某一路电器的开关,接收外部操作指令形成各种控制信号,并完成对于各种信息的记录。接口电路提供单片机与电话外线的接口,其中包括振铃检测、摘挂机电路、双音多频识别电路以及语音提示电路。该系统通过对不同按键信号的识别来控制不同家用电器的开或关。     

电信网间主叫号码传送规范的探讨

本文以信息产业部下发的4个网间主叫号码的传送标准为依据,结合实际情况,对一个本地电话或是长途电话的呼叫,对一个固定电话或是移动电话的呼叫在不同运营商电信网间传送的号码的格式、地址性质、和主叫号码的显示的要求做了具体说明,并指出了目前不规范主叫号码的传送带来的问题。     

GSM网络中建设虚假主叫实时监控的可行性分析

针对虚拟主叫号码的呼叫进行分析和研究,建设虚拟主叫监控系统,并通过与信令监测系统、综合网管、综合营帐等多个系统的实时接口,建立多平台之间联合诊断,实现对虚假主叫实时判断和拦截的自动化处理流程。     

智能远程报警系统研发

提供基于电话网络远程家庭监控系统的设计,此系统可实现智能防盗报警。主要针对家庭实行多点监测,可进行自动摘机和拨号报警。系统由AT89C51组成中央控制模块、电话网络模块、信息传送模块、遥控模块组成,介绍有警情和有被叫时的工作原理以及遥控电路和摘机、DTMF拨号电路的框图。     

华为程控交换机数据配置和维护经验

主要是总结开通七号电路提示"中继电路超过数字词典"、汇线通用户呼出显示总机号码设置、SMII无法传真常见故障原因、主叫号码甄别对呼转用户的影响、RSP框用户无拨号音故障处理和SMII用户不能呼入呼出模块外用户,模块内可以正常呼入呼出几个故障案例。     

家用电器远程控制系统的设计

介绍一种以A T89C51为核心,可通过电话遥控的多路智能控制器。该系统由硬件和软件两部分组成。通过对公用电话网用户线状态的检测,用计算机实现双音频拨号号码的识别,提出一种利用硬件和软件相结合完成检测的技术。硬件电路是以MT8870双音频解码器件为核心,完成对双音频信号的分离、滤波、检波和译码。实践表明这种方法直观、有效、可靠。文章对系统工作原理及信号变换过程等进行详细说明。     

基于ARM和GPRS远程数据传输的光纤智能结构监控系统

提出并设计了一种基于Advanced RISC Machines（ARM）和General Packet Radio Service（GPRS）的远程数据传输系统,该系统用于光纤智能结构的健康监控。系统包括光源、光纤智能结构、光电检测电路、远程终端单元（RTU）、GPRS网络、Internet和监控中心服务器,其中终端单元由ARM微控制器和GPRS无线通信模块组成。RTU与监控中心之间是通过GPRS网络和Internet来进行数据交换的,在监控中心收到的数据中包含了复合材料智能结构的健康状态信息,通过对数据的处理就能判断材料结构的健康状态,从而达到对智能材料结构的健康状态进行远程监控的目的,同时还进行了相应的承载试验以及损伤定位研究。试验结果表明：该监控系统实现了对光纤智能结构的无线远程监控和损伤定位,且性能稳定可靠,为复合材料结构的健康状态监控提供了一种新方法。     

华为交换设备如何实现PRA计费

本文对华为交换设备实现PRA计费进行了详细分析和论证,并对不计费方式及主叫号码传送进行了详细描述,为实现PRA灵活计费提供了有力的指导。     

三轴激光陀螺放电状态监控

对三轴激光陀螺的结构及串扰现象作了简要介绍,提出了放电状态监控电路的必要性.基于所设计的高压稳流电源电路,提出在高压电源每一稳流支路加入一路模拟开关,来控制稳流和状态监控的时序,从而通过监测采样电阻的端电压来实现放电状态的监控,并详细阐述了三轴放电状态监控电路的软硬件实现.最后对电路进行了实验测试,三轴激光陀螺在5s内的点燃率达到100%,电流的长期稳定度优于1×10-4,验证了状态监控电路的可行性和可靠性.     

A computer-controlled environmental test system for high pin-count integrated circuit packages

An automated environmental stress testing system, designed and assembled for testing of high pin-count integrated circuit packages and surface mount solder joint reliability is described. Details are given of the software and hardware used in the control of the environment chambers used, in monitoring of test specimen reliability parameters and in control and monitoring of special purpose integrated circuits for testing of IC package reliability. In addition, an automatic system for monitoring of the resistance of fine pitch surface mount solder joints and for detection and recording of thermally induced intermittent open circuits in these joints is described.     

带有余弦函数的三维混沌弱信号检测系统及电路实现

从理论上分析了二维Duffing弱信号检测系统变量输出在混沌和周期态之间交替转换。发现一种新的三维混沌弱信号检测系统生成规则,以生成4种检测系统之一的三维Liu-cos混沌系统为例,采用傅里叶变换等方法从理论上验证了新生成的三维混沌弱信号检测系统输出信号具有广域收敛性,解决了二维Duffing混沌弱信号检测系统不能广域检测和输出信号不收敛问题;新设计的三维Liu-cos混沌弱信号检测电路空中声波实验显示可抗低频声波干扰,检测性能优于二维Duffing混沌电路和新设计的Duffing＋滤波器电路,水中实验显示三维Liu-cos混沌弱信号检测电路可抗高频水声干扰,可检测波形畸变的水声信号。     

快速高精度光电测速算法

研究基于光电编码器和四倍频电路的单片机速度测量系统的简化算法。该算法通过减少乘除运算缩短了测量时间,选用整数除法和分频电路避免了计算误差。作者编制了参数配置表,可使本文算法适配于不同当量系数的编码器。简化算法完成一次测量约需0.25s,可达1m/h的最小速度分辨力。该算法满足高精度、高分辨力和快速测量的要求,已成功用于作者研制的石油测井闭环速度控制。     

无人机发动机点火停车电路故障在线检测研究

为了解决某型无人机发动机的飞行故障隐患,通过对发动机点火停车电路所存在故障的模型研究,运用Pspice仿真软件对电路故障进行仿真,采用基于故障字典的故障诊断技术,建立了诊断故障字典．利用单片机设计了一套在线故障检测系统,提出了“状态传递”的测试策略进行测点优化,简化了系统设计,提高了故障诊断效率,实现了无人机发动机点火和停车电路故障的在线检测,确保了无人机的飞行安全和飞行任务的完成．     

基于霍尔效应的印刷机能耗检测方法研究

目的采用霍尔元件法搭建印刷机群能耗数字化检测平台。方法通过建立印刷机能耗指标模型框架体系,形成以总耗电量指标、均值类指标、耗电比例类指标等为主的印刷机耗电评价标准,完善能耗评价准则。采用灵敏度高、稳定性好的霍尔元件作为能耗检测元件,并分析霍尔效应、磁平衡式电流和电压霍尔传感器的检测电路。采用伏安法功率测量方式分别检测各负载电路的电流与电压,通过A/D转换模块实现检测数据数字化,并通过硬件控制核心对采集的数字信号进行运算、输出和显示,采用CAN总线实现硬件控制系统与上位机之间数字信息交互。结果搭建了印刷机群能耗数字化检测系统平台,实现了外围设备与上位机间的数据交互,实现了印刷机群以数据为核心,通过能耗检测、能效分析、能源成本控制以及能源指标优化,提高了能源利用效率。结论能耗检测的实现既能减少冗余电量损耗,又有利于监测电路稳定性,利用霍尔元件法实现印刷机群能耗检测的方法是可行的。     

Primary-to-secondary leak monitoring using information obtained from measurement of reference radionuclides in NPP water

Detection of heat-exchange equipment failures in the primary circuit is one of the problems to be solved by radiochemical monitoring during operation of nuclear power installations. A series of experimental and numerical studies were performed in a low-power installation with a water-cooled water-moderated reactor where sequential failure of heat exchangers in two reactor water cleanup and cooling units occurred and progressed. The mechanism of transport of radionuclide impurities from the primary to secondary circuits was determined, and data for different radionuclides were obtained to compare how valuable each radionuclide was as information source for leak detection and monitoring.     

Radiochemical monitoring in life tests of fuel for new reactor cores

Detection of heat-exchange equipment failures in the primary circuit is one of the problems to be solved by radiochemical monitoring during operation of nuclear power installations. A series of experimental and numerical studies were performed in a low-power installation with a water-cooled water-moderated reactor where sequential failure of heat exchangers in two reactor water cleanup and cooling units occurred and progressed. The mechanism of transport of radionuclide impurities from the primary to secondary circuits was determined, and data for different radionuclides were obtained to compare how valuable each radionuclide was as information source for leak detection and monitoring.     

An electrical circuit theoretical method for time‐ and frequency‐ domain solutions of the structural mechanics problems

Shrinking device dimensions in integrated circuit technology made integrated circuits with millions of components a reality. As a result of this advance, electrical circuit simulators that can handle very large number of components have emerged. These programs use new circuit simulation techniques and can find solutions accurately and quickly. In this paper, we apply these techniques to structural mechanics problems by adopting electrical circuit equivalents. We first apply finite element formulation to the mechanical problem. The obtained sets of equations are treated as if they are sets of equations of an equivalent electrical circuit which consists of linear circuit elements such as capacitors, inductors and controlled sources. The equivalent circuit is obtained in the form of a circuit netlist and solved using a general purpose electrical circuit simulator. Several examples showing the advantages of the circuit simulation techniques are demonstrated. Asymptotic waveform evaluation technique which is widely used for simulation of large electrical circuits is also studied for the same examples and the speed‐up advantage is shown. Copyright © 1999 John Wiley & Sons, Ltd.     

Computer Augmented Oscilloscope System

The Computer Augmented Oscilloscope System (CAOS) is a laboratory-computer terminal intended for experiments involving waveforms and their interpretation. The terminal is portable and can be used wherever telephone access to a suitably programmed computer is available. The CAOS laboratory equipment includes a sampling oscilloscope with a storage CRT, the terminal proper, and a telephone line connection. The terminal includes alphameric and function keyboards, A/D and D/A converters, a read-only store character generator, sequencing and control logic, and circuits for interfacing to the oscilloscope and the telephone line. CAOS is an interface between the experimenter, the experiment, and the computer. It provides digital acquisition of waveform data, system calibration, data analysis, experiment control, and graphic and alphameric display. CAOS can emulate a number of laboratory instruments and can operate additional X-Y storage oscilloscopes.     

Fault Diagnosis of Power Electronic Circuits Based on Adaptive Simulated Annealing Particle Swarm Optimization

In the field of energy conversion, the increasing attention on power electronic equipment is fault detection and diagnosis. A power electronic circuit is an essential part of a power electronic system. The state of its internal components affects the performance of the system. The stability and reliability of an energy system can be improved by studying the fault diagnosis of power electronic circuits. Therefore, an algorithm based on adaptive simulated annealing particle swarm optimization (ASAPSO) was used in the present study to optimize a backpropagation (BP) neural network employed for the online fault diagnosis of a power electronic circuit. We built a circuit simulation model in MATLAB to obtain its DC output voltage. Using Fourier analysis, we extracted fault features. These were normalized as training samples and input to an unoptimized BP neural network and BP neural networks optimized by particle swarm optimization (PSO) and the ASAPSO algorithm. The accuracy of fault diagnosis was compared for the three networks. The simulation results demonstrate that a BP neural network optimized with the ASAPSO algorithm has higher fault diagnosis accuracy, better reliability, and adaptability and can more effectively diagnose and locate faults in power electronic circuits.