毕业设计(论文)-基于防火监测及硬件电路Multisim的仿真设计.doc

PAGE\*MERGEFORMATI基于防火监测及硬件电路Multisim的仿真设计摘要本文介绍了一种防火检测电路及其工作的基本原理，使用EDA软件Multisim10.0建立光电信号转换部分的仿真模型。硬件电路包括光电检测电路和声光报警电路两部分。在光电检测电路部分，采用VTT1116型硅光敏三极管作为燃烧火焰检测的光电转换器件，光敏管输出的电压信号Va经过两级通用型运算放大器放大，放大后的电压信号为。作为比较电压输出到声光报警电路。声光报警电路由四个相同的报警单元组成。每个单元均采用高精度电压比较器LM311作阈值电压比较。当大于阈值，LED点亮，蜂鸣器发出报警声。点亮的LED个数越多，表明火灾形势越严重。关键词：火焰检测；声光报警；multisim仿真。Firemonitoringandhardware-basedsimulationofMultisimcircuitdesignAbstract：Thisthesisintroducestheworkbasicprincipleoffiredetectioncircuit,andsetsthesimulationmodelofthephotoelectricsignalconversioncircuitbyEDAsoftwareMultisim10.0.Thehardwarecircuitsincludestwoparts,thatis,photoelectricdetectioncircuitandsoundandlightalarmcircuit.Forthephotoelectricdetectioncircuit,weuseVTT1116asthephotoelectricdetectioncomponentwhoseoutputisconveyedtothesoundandlightcircuitafteramplificationbytheInternally-compensatedduallownoiseoperationalamplifier.Thesoundandlightalarmcircuitcontainfoursameunits.EachunithasaLM311asthevoltagecomparator.Whentheamplifiedvoltageofthephotistor’semitterregionlargerthanthethreshold,theLEDislightedandthebuzzersounds.MoreLEDislighted,thefireismorefierce.Keywords：photoelectricdetection;soundandlightalarm;thesimulationofmultisim.目录TOC\o"1-3"\h\uHYPERLINK\l_Toc8453摘要PAGEREF_Toc8453IHYPERLINK\l_Toc15900第一章绪言PAGEREF_Toc159001HYPERLINK\l_Toc158001.1学术背景及意义PAGEREF_Toc158001HYPERLINK\l_Toc129151.1.1学术背景PAGEREF_Toc129151HYPERLINK\l_Toc207401.1.2意义PAGEREF_Toc207402HYPERLINK\l_Toc145201.2国内外文献综述PAGEREF_Toc145203HYPERLINK\l_Toc19028第二章防火检测电路PAGEREF_Toc190284HYPERLINK\l_Toc170312.1光电检测电路PAGEREF_Toc170314HYPERLINK\l_Toc320722.1.1.光电检测电路原理图PAGEREF_Toc320724HYPERLINK\l_Toc91302.1.2元件清单列表PAGEREF_Toc91308HYPERLINK\l_Toc108802.2声光报警电路PAGEREF_Toc1088010HYPERLINK\l_Toc282182.2.1.声光报警电路原理图PAGEREF_Toc2821810HYPERLINK\l_Toc19912.2.2.电路工作原理PAGEREF_Toc199111HYPERLINK\l_Toc11852.2.3元件清单列表PAGEREF_Toc118512HYPERLINK\l_Toc26862.3电路图中主要元器件简介PAGEREF_Toc268614HYPERLIN