【正文】 o t he r est of t he dat a t o be m odif ied. I n or der t o ensur e m axim um server except ion, saving som e data, synchronization of r eal tim e backup soft war e should have high, t hat delay does not exceed 1 minut e. Of f sit e backups t hat m ust be suppor ted acr oss wor k segm ents. I n accor dance wit h t he above r equir em ents f or developm ent our dedicat ed backup soft ware. Af ter developm ent , wing t hat opened in salt on high speed t est r esult s m eet t he design r equir em ent sWit h t he passing of t ime, it is pr eparing sour ce Huan of Hubei ndustrial investm ent pany lim it ed f act or y close t o t he planni g of t he day looks like, planni g human ideals gr adually int o an enti y, spread out bef or e us. Securit y plan ent er s t he deployed St at e. Af t er list ening t o your business obj ective f or t he leaders of securit y, I quickly people wit h loyalt y t o t he cause of securit y, as well as pr evious securit y experience, bined wit h peer pioneers of success stories or exper iences. Bor der securit y on your business ideas and suggest ions t o m ake as f olows: 1. 1 af ter caref ul analysi of a blueprint of t he ent erprise, t aking int o account your enter prise f act or y boundary: x r ectangular sit e. 1. 2 scope f or such dachangqu, I r em end t he solid bor der securit y deployment , f or a r ange of r easons, whet her we use inf r ar ed r adiat ion, elect r onic f ences, alarm had done t her e, wher e t he r esponse. Because t he f act ory could not spend a gr eat deal of m anpower cost o post hr ee steps, f ive steps and a whist le. As we all know, under t he cur ent f orm of hum an r esources costs m uch igher t han t he cost of all scientif ic and t echnological input . I n or der t o bett er achieve t he goal of planner s, as well as f or Active solid bor der defense wor k. We r em end t hat you se inf rared r adiation or linkage of electr onic f ences wit h video securit y deployment t o achieve securit y goals. 1. 3 in accordance wit h t he device on t he wall of t he pound pr operties and parameters t o a r easonable plan t o install t he inf rared r adiat ion equipm ent or f ences and electr onic equipm ent as well as video surveilance equipm ent, t he specif ic needs of t he equipm ent and m aterials quant ites we wil det ail at er. 1. 4 t he pr ogr amme according t o your pany39。 13 浪涌短路保護(hù)電路的設(shè)計 12 過流保護(hù)電路的設(shè)計 10 真有效值轉(zhuǎn)換電路的設(shè)計 4 總體設(shè)計方案 目錄 該電源采用推挽升壓和全橋逆變兩級變換 ， 在控制電路上，前級推挽升壓電路采用 SG3525 芯片控制 ，閉環(huán)反饋； 逆變部分采用 驅(qū)動芯片 IR2110 進(jìn)行全橋逆變，采用U3990F6 完成 SPWM 的調(diào)制 ， 后級輸出采用電流互感器進(jìn)行采樣反饋，形成雙重反饋環(huán)節(jié)，增加了電源的穩(wěn)定性； 在保護(hù)上，具有輸出過載、短路保護(hù) 、過流保護(hù)、空載保護(hù) 等多重保護(hù)功能電路，增強(qiáng)了該電源的可靠性和安全性 ；輸出交流電壓通過 AD637 的真有效值轉(zhuǎn)換后，再由 STC89C52 單片機(jī)的控制進(jìn)行模數(shù)轉(zhuǎn)換，最終將電壓值顯示到液晶 12864 上，形成了良好的人機(jī)界面。s envir onm ent al needs, and engagem ent f unctions t o establish t he pr oject boundar y secur it y alarm system , in a Word, t his boundar y is a pr oj ect of t he securit y alarm syst em is highly aut om at ed and ef ficient hospit alit y f or a f ort able, convenient, and highly secur e envir onment . Five, scheme design based on design principles, design specif ications and accor ding t o int ernat ional and dom estic st andar ds, and in accor dance wit h user needs, as well as dr awings and r elat ed inf orm ation pr ovided by, and j oining t he pr oject 39。 design has t he scient if ict y, r easonabilt y and operabilt y. I ts has f ol wing pr inciples: 2. 1, and advanced and applicabilt y used cur ently m ost advanced of sof t, and hardware and t he wor k t echnol gy, er rors r at e low, patible sex st r ong, upgr ade easy, used module t ype str uct ur e, expansion convenient, no r epeat const ruct ion i vestment, syst em of t echnol gy per form ance and qualit y index should r eached int er nat ional eading level。synchronous backup sof t ware does not r espond t o t he r est of t he dat a t o be m odif ied. I n or der t o ensur e m axim um server except ion, saving som e data, synchronization of r eal tim e backup soft war e should have high, t hat delay does not exceed 1 minut e. Of f sit e backups t hat m ust be suppor ted acr oss wor k segm ents. I n accor dance wit h t he above r equir em ents f or developm ent our dedicat ed backup soft ware. Af ter developm ent , wing t hat opened in salt on high speed t est r esult s m eet t he design r equir em ent sWit h t he passing of t ime, it is pr eparing sour ce Huan of Hubei ndustrial investm ent pany lim it ed f act or y close t o t he planni g of t he day looks like, planni g human ideals gr adually int o an enti y, spread out bef or e us. Securit y plan ent er s t he deployed St at e. Af t er list ening t o your business obj ective f or t he leaders of securit y, I quickly people wit h loyalt y t o t he cause of securit y, as well as pr evious s ecurit y experience, bined wit h peer pioneers of success stories or exper iences. Bor der securit y on your business ideas and suggest ions t o m ake as f olows: 1. 1 af ter caref ul analysi of a blueprint of t he ent erprise, t aking int o account your enter prise f act or y boundary: x r ectangular sit e. 1. 2 scope f or such dachangqu, I r em end t he solid bor der securit y deployment , f or a r ange of r easons, whet her we use inf r ar ed r adiat ion, elect r onic f ences, alarm had done t her e, wher e t he r esponse. Because t he f act ory