【正文】 realtime intelligent terminals, munication equipment, navigation, household appliances automation field widely used.In coal mine production in coal mine, the power system protection relay protection device is used mostly, along with the puter technology, microelectronics technology, information technology, work munication technology unceasing development, intelligent protection system has been developed successfully in hardware, data processing, using powerful ability of DSP microprocessor, lowpower programmable logic chips and high integration of specialpurpose chip, make whole system reliability has greatly improved, so as to ensure the quality of production. This design USES the monolithic AT89C51 for \ D converters, D/A converter I \ control, through the mouth of output is temporal O the torquecurrent as control signal, collecting, processing, and according to the signal processing results issued corresponding control signal and display alarming.Keywords: MCU ；A \ D converters ；D/A converter目錄目錄摘要 ........................................................................................................................................................................IABSTRACT ...................................................................................................................................................II1 緒論 ...................................................................................................................................................................1 引言.............................................................................................................................................................1 煤礦供電系統(tǒng)保護(hù)概述 ......................................................................................................................1 PROTEL 簡(jiǎn)介 ............................................................................................................................................4 PROTEL 的發(fā)展 ..............................................................................................................................4 PROTEL99 的組成及主要特色 ..................................................................................................4 PROTEL 存在的問(wèn)題 .....................................................................................................................6 PROTEL 99SE 的特點(diǎn) ...................................................................................................................6 煤礦供電系統(tǒng)保護(hù)框圖 ......................................................................................................................72 控制系統(tǒng)的硬件電路的設(shè)計(jì) ...........................................................................................................9 方案簡(jiǎn)介 ...................................................................................................................................................9 硬件電路設(shè)計(jì) .......................................................................................................................................11 單片機(jī)簡(jiǎn)介 ...................................................................................................................................11 互感器 .............................................................................................................................................18 整流裝置 .......................................................................................................................................23 有緣濾波器 ..................................................................................................................................23 采樣保持器 ...................................................................................................................................25 A\D 轉(zhuǎn)換 ........................................................................................................................................26 D\A 轉(zhuǎn)換器 ....................................................................................................................................28 報(bào)警設(shè)備 .......................................................................................................................................29 液晶顯示 .......................................................................................................................................31 光電耦合器的功能及簡(jiǎn)介 ...................................................................................................32 部分元件設(shè)計(jì) .......................................................................................................................................34 時(shí)鐘電路設(shè)計(jì) ..............................................................................................................................34 復(fù)位電路設(shè)計(jì) ..............................................................................................................................353 抗干擾措施.................................................................................................................................................36目錄 硬件抗干擾措施...................................................................................................................................36 軟件抗干擾措施...................................................................................................................................36結(jié)論......................................................................................................................................................................38參考文獻(xiàn) ..........................................................................................................................................................39致謝......................................................................................................................................................................40附錄......................................................................................................