一种消防应急灯具专用控制芯片的设计

国内的消防应急灯具大多采用分立器件搭建而成,很多无法达到国家标准。提出一种消防应急灯具专用控制芯片的设计方法,具体介绍了芯片的内部组成部分,构建了整体方案,规划了芯片的功能单元并采用模块化设计思想。该芯片可有效增加应急灯具的稳定性,防止静电干扰冲击,降低生产成本并解决分立器件所带来的功能单一和设计不灵活等问题。     

维修集锦

海马牌微电脑型电暖壶常出水的应急处理故障现象:电暖壶只要一接通电源,壶嘴就出水。分析检修:据故障现象分析,水泵没有问题,故障一定在控制开关电路,即开关或电路板上的元件短路。先将出水控制开关拆下来检查,没有发现短路迹象,控制也正常,这说明问题出在主电路板上。然后将主电路板拆下来观     

成都联通开展消防应急演练

本刊讯7月7日,中国联通成都市分公司成功组织核心局房消防应急演练。本次演练是成都市网络分公司成立以来规模最大、投入最多、科目最全面的消防应急演练。本次演练以茶店子主、副楼机房为模拟火灾场所,内容包含机房火灾应急抢险、火情扩散、消防报警、人员疏散自救以及自动灭火系统启动等环节,参与员工达164人,演练中两次机房电子设备小火抢险均在5分钟内完     

卫星通信在跨区域应急救援中的应用

介绍应急通信系统的组成及主要功能,描述了在应对突发事件过程中,事故现场与指挥中心之间语音、视频及数据业务的实现方式。最后,结合消防卫星网研究了跨区域应急救援卫星通信中的应用。     

消防应急通信保障体系构建研究

建设消防应急通信保障体系对于维护社会稳定、保障人民群众生命财产安全具有重要意义。在灾害和突发事件发生时,快速、准确地信息传递和指挥协调对于救援行动至关重要,而应急通信工作是其基础通信保障,也是指挥协调和提升救援效率的关键。然而,当前实际工作中仍然存在人才梯队建设不足、消防应急通信网络基础薄弱、应急通信设备抗干扰能力弱以及新技术应用不足等问题。为了补齐这些短板,本文提出了针对性的措施建议,希望有效提升消防应急通信保障体系的建设水平,推动消防行业的现代化发展。通过引入新技术和加强人才培养和推进信息化建设,消防救援队伍可以适应信息时代的要求,提升应急通信的抗干扰能力和适应能力,以更好地应对新形势下的灾害应急需求。     

论重特大灾害消防应急通信技术

消防应急通信在各类的灾害的消防抢险,特别是重特大灾害的应急抢险中具有重要的作用。建立高效的消防应急通信系统,是对消防部队提高其应急反应速度及应急救援效率的要求,是消防部队指挥部门进行及时指挥调度的有效保障。要确保消防应急通信系统的高效运行,离不开消防应急通信技术。本文就我国重特大灾害消防应急通信的现状进行分析,简单介绍了我国重特大灾害消防应急通信的技术,并提出了在重特大灾害中我国消防应急通信技术应该改进的地方。     

基于PyroSim的复杂矿井火灾烟气智能控制研究

建立PyroSim模型模拟复杂矿井火灾烟气运动过程,通过大安山煤矿通风系统的应用实例,获得矿井通风网络内风流状态及火灾烟流的分布,对复杂矿井编制应急预案、消防演练、反风实验以及通风优化和评估具有重要参考价值。     

水电厂照明节能研究与探讨

通过对水电厂照明现状调查分析,阐述了水电厂照明存在的问题,提出整改方案,从照明方式、控制方式、光源选用、灯具选择等方面,对实现照明系统的节能、安全、集中控制以及光照度等功能方面进行了探讨,并对其利弊性进行了分析,对水电厂照明节能改造具有一定的意义,同时也为水电厂照明设计提供借鉴作用。     

普传变频器在消防应急电源EPS系统中的应用

本文介绍了如何使用普传P17100变频器的主板端子功能及保护功能实现变频器在建筑行业消防应急电源EPS系统自动调速控制的工艺要求，展望变频器在应急电源EPS系统中应用的前景，变频器常见故障及排除措施。     

道路施工警示灯控制电路

<正> 在城镇道路施工时,夜间通常要在施工现场设置并开启红色警示灯具,以防止夜晚过往人员、车辆发生事故。为了提高警示效果、节省电能和方便使用,警示灯最好工作在闪烁状态,并采用自动控制方式。本文介绍的警示灯控制的电路就具备了闪烁和光控两种功能,即天黑后能控制警示灯自动开启并工作在闪烁状态,天亮后又能将警示灯自动关闭。     

一种LED照明应急两用的驱动电路设计

为了解决采用传统光源设计的应急照明灯存在的应急时间不长等问题,设计了一种LED日常照明和应急照明两用驱动电路,分析了采用LED作为应急照明光源的优势,利用仿真软件saber建立了LED恒流驱动控制芯片Qx9910的仿真模型,在建立起电路各个主要模块的基础上,搭建了LED照明应急两用驱动电路,并在日常照明和应急照明2种工作模型下对电路进行了整体仿真。仿真结果表明,该电路在2种工作模式下都能稳定运行,能实现预期的设计目标。     

Modal analysis of loaded N-port scatterers

AnN-port loaded scatter is one havingNports to which lumped impedance loads or a load network is connected. Methods are given to determine the characteristic modes of a loaded scatterer and for using them in a modal solution for electromagnetic scattering. A procedure is also given for resonating any given real port current, which makes that current the dominant mode of the loaded scatterer. The theory is formulated both in terms of open-circuit and short-circuit network parameters. A number of numerical examples are given for a wire triangle to illustrate the general theory. Computer programs are available for all procedures discussed.     

Non-interacting write and read processes in organic memory devices

In organic memory devices, we introduce non-interacting “write” and “read” processes so that the state of a device is not perturbed during the “read” process. We have used heterojunction devices based on suitable materials in such a way that they can generate photovoltage and photocurrent upon illumination. Both open-circuit voltage or short-circuit current of the device have responded to conductance switching. We have showed that the device can be switched to a high-conducting state by applying a suitable voltage pulse and its state can be probed or “read” by measuring open-circuit voltage or short-circuit current. The results show newer parameters to probe organic memory devices.     

Two-port subnetworks of exponential distributed parameter Z-Y-KZ and Y-Z-KY micro-circuits with similar transfer functions

This paper shows that one may find a two-port subnetwork of the exponential distributed parameter (DP) Z-Y-KZ micro-circuit whose open-circuit voltage and short-circuit current ratio-transfer functions are exactly the same as those of another two-port subnetwork of the exponential (DP) Y-Z-KY micro-circuit. There are in total 28 such unique non-redundant two-port subnetworks of the exponential Z-Y-KZ structure which have their counterparts produced by the exponential Y-Z-KY micro-circuit. The results are given in a table. This information is intended to eliminate the duplicacy of time-consuming labour involved in the analyses of these subnetworks obtainable from the exponential Z-Y-KZ and Y-Z-KY structures in view of recent interest in the performance characteristics of such subnetworks.     

大型商场智能照明控制系统的设计

提出一种基于集中供电方式的大型商场智能照明控制系统的设计方法,该系统通过电力线载波技术实现主机和分机的通信。主机具有分区控制,自动开关和根据环境亮度开关等功能。与传统照明方式相比,具有EMI小、成本低、易于工程实现等优势,从而达到绿色照明和节能减排的目的。     

Cost-effective smart power CMOS/DMOS technology: design of main driving and protection functions

This paper intends to show that even with a CMOS technology main driving and protection functions of a power VDMOS can be made performant. Original circuits taking advantage of the availibility of the parasitic vertical bipolar transistor are presented and experimentally evaluated. A current mode approach is proposed to improve the accuracy of the current sensing function aimed at performing overcurrent, short-circuit and open-load detection.     

Improved method to extract the short-circuit parameters of the BECM

The current method for extracting the short-circuit broadband extended cantilever model (BECM) parameters requires measurement of short-circuit currents, and is problematic over a wide frequency range, prohibiting each short-circuit parameter to be directly measured. The improved method presented herein eliminates the measurements of short-circuit currents. Each short-circuit BECM parameter is directly found from two measurements, an open-circuit voltage gain and a short-circuit admittance. The method is demonstrated for a published five-winding BECM.     

Observations of dislocations and junction irregularities in bipolar transistors using the E.B.I.C. mode of the scanning electron microscope

The E.B.I.C. mode of the SEM has been used to study defect structures in bipolar transistors, with particular attention paid to the way in which the presence of the second junction affects the contrast. When the E.B.I.C. signal was collected from the emitter/base junction, a dislocation network giving black contrast was observed for both an open-circuit and short-circuit collector/base junction. However, when the signal was collected from the collector/base junction, black contrast was observed for an open-circuit emitter/base junction and white contrast for a short-circuit junction. It is shown that the white contrast is caused by irregularities in the emitter/base junction, resulting from a local retardation of the phosphorus diffusion at points where dislocations occur.     

集群LED显示屏状态监控方案

本方案介绍的控制系统可监视到显示屏中每一个环节的状态,包括控制系统的工作状态、每一块扫描板的工作状态、每一个箱体内的温度/湿度/烟雾、每一个箱体内每一个风扇的转速、每一个箱体内每一块开关电源的电压以及显示屏上每一颗LED灯的开短路情况。在此控制系统的基础上,文章介绍的LED显示屏网络化集群监控软件可以在服务器端远程监控每一块显示屏每一个环节的状态,并且在显示屏出现故障时可以通过E-mail和GPRS模块及时报警。通过本方案,LED显示屏制造商或者运营商可以全面而且及时地掌握系统的运行状态,可以及时监控已经出现或可能出现的故障,从而显著提高LED显示屏的维护速度,有效规避运营风险。