Saaxiibo badan ayaa marar badan waydiiyey in korontada maansada ay deggan tahay?Waa maxay fiilada ugu fiican ee korontada poe?Maxay tahay sababta loo isticmaalo daminta gabayada si loo xoojiyo kamarada weli lama soo bandhigayo?iyo wixii la mid ah, dhab ahaantii, kuwani waxay la xiriiraan lumin koronto ee korontada POE, taas oo sahlan in la iska indho tiro mashruuca.
1. Waa maxay korontada POE
PoE waxaa loola jeedaa gudbinta xogta qaar ka mid ah terminaalka IP-ku salaysan (sida teleefanka IP, wireless LAN access point APs, camera networks, iwm) iyada oo aan wax isbeddel ah lagu samayn kaabayaasha Ethernet Cat.5 ee jira.Isla mar ahaantaana, waxay sidoo kale siin kartaa tignoolajiyada korontada DC ee aaladahaas.
Tiknoolajiyada PoE waxay xaqiijin kartaa hawlgalka caadiga ah ee shabakada hadda jirta iyadoo la hubinayo amniga fiilooyinka habaysan ee jira, oo la yareeyo kharashka.
Nidaamka PoE oo dhamaystiran waxa uu ka kooban yahay laba qaybood: qalabka korontada iyo qalabka korontada.

Qalabka Korontada (PSE): Furayaasha Ethernet, router-ka, hub-yada ama aaladaha beddelka shabakadaha kale ee taageera hawlaha POE.
Aaladaha ku shaqeeya (PD): Nidaamka la socodka, inta badan waa kamarada shabakada (IPC).
2. Heerka korantada POE
Heerka caalamiga ah ee ugu dambeeyay IEEE802.3bt wuxuu leeyahay laba shuruudood:
Nooca koowaad: Waxaa ka mid ah in awoodda wax-soo-saarka PSE-da looga baahan yahay inay gaadho 60W, awoodda gaadhaysa aaladda korontadu waa 51W (waxaa laga arki karaa shaxda kore in tani ay tahay xogta ugu hooseysa), iyo Korontadu waa 9W.
Nooca labaad: PSE waxaa looga baahan yahay si loo gaaro awood wax soo saar ah oo ah 90W, awoodda gaareysa aaladda korontadu waa 71W, khasaaraha korontaduna waa 19W.
Marka la eego shuruudaha kor ku xusan, waxaa la ogaan karaa in kororka korontadu uusan u dhigmin korontadu, laakiin khasaaraha ayaa sii kordhaya oo sii kordhaya, haddaba sidee loo xisaabin karaa khasaaraha PSE ee ficil ahaan?
3. Awoodda POE oo lumisay
Haddaba bal aynu eegno sida loo xisaabiyo khasaaraha kadhashay awoodda fiisigiska dugsiga sare.
Sharciga Joule waa sharaxaad tiro badan oo ku saabsan beddelka tamarta korantada ee kulaylka iyadoo la adeegsanayo hadda.
Dulucda waxa weeye: kulaylka ka dhasha kaariyaha hadda marayaa waxa uu la mid yahay laba jibbaaran ee hadda jira, una dhiganta caabbinta daariyahan, oo u dhiganta wakhtiga la tamarinayo.Taasi waa, isticmaalka shaqaalaha ee ka soo baxa habka xisaabinta.
Tibaaxda xisaabta ee sharciga Joule: Q=I²Rt (oo lagu dabaqi karo dhammaan wareegyada) halka Q ay tahay awoodda luntay, P, I waa kan hadda jira, R waa caabbinta, tna waa wakhtiga.
Isticmaalka dhabta ah, maadaama PSE iyo PD ay shaqeeyaan isku mar, khasaaruhu wax shaqo ah kuma laha waqtiga.Gabagabada ayaa ah in lumista awoodda fiilada shabakadda ee nidaamka POE ay u dhiganto labajibbaaran ee hadda iyo qiyaasta xajmiga caabbinta.Si fudud loo dhigo, si loo yareeyo isticmaalka awoodda fiilada shabakadda, waa inaan isku daynaa inaan ka dhigno hadda silig yar oo iska caabinta fiilada shabakadu yareyso.Waxaa ka mid ah, muhiimada hoos u dhigista hadda ayaa si gaar ah muhiim u ah.
Ka dib aan eegno xuduudaha gaarka ah ee halbeegga caalamiga ah:
Heerka IEEE802.3af, caabbinta fiilada shabakadu waa 20Ω, korantada wax soo saarka PSE ee loo baahan yahay waa 44V, kan hadda jira waa 0.35A, khasaaraha korantaduna waa P=0.35*0.35*20=2.45W.
Sidoo kale, heerka IEEE802.3at, caabbinta fiilada shabakadu waa 12.5Ω, korantada loo baahan yahay waa 50V, hadda waa 0.6A, khasaaraha korontaduna waa P=0.6*0.6*12.5=4.5W.
Labada heerba dhib kuma laha isticmaalka habkan xisaabinta.Si kastaba ha ahaatee, marka heerka IEEE802.3bt la gaaro, looma xisaabin karo sidan.Haddii danabku yahay 50V, awoodda 60W waa inay u baahan tahay hadda oo ah 1.2A.Waqtigaan, khasaaraha korontadu waa P = 1.2 * 1.2 * 12.5 = 18W, laga jaray khasaaraha si loo gaaro PD Awoodda qalabku waa 42W kaliya.
4. Sababaha POE korontada
Hadaba waa maxay sababtu?
Marka la barbardhigo baahida dhabta ah ee 51W, waxaa jira 9W awood yar.Haddaba maxaa keenaya qaladka xisaabinta.
Aynu mar kale eegno tiirka u dambeeya ee garaafka xogtan, oo si taxadar leh u fiirso in kan hadda jira ee IEEE802.3bt ee asalka ahi uu weli yahay 0.6A, ka dibna aan eegno lammaanaha korantada ee qalloocan, waxaan arki karnaa in afar lammaane oo laba-laab ah oo koronto ah. sahayda waxaa loo isticmaalaa (IEEE802.3af, IEEE802. 3at waxaa ku shaqeeya laba lammaane oo lammaane maroojin ah) Sidan, habkan waxaa loo tixgelin karaa wareeg isku mid ah, hadda wareegga oo dhan waa 1.2A, laakiin wadarta khasaaraha waa laba jeer. midda labada lammaane ee lammaanaha korantada ee qalloocan,
Sidaa darteed, khasaaraha P=0.6*0.6*12.5*2=9W.Marka la barbar dhigo 2 lammaane oo xadhkaha-labo-laaban, habkan korantada ayaa badbaadiya 9W oo koronto ah, si PSE ay uga dhigto aaladda PD inay hesho koronto marka awoodda wax soo saarku ay tahay 60W oo keliya.Awooddu waxay gaari kartaa 51W.
Sidaa darteed, marka aan doorano qalabka PSE, waa in aan fiiro gaar ah u leenahay yareynta hadda iyo kordhinta tamarta inta ugu badan ee suurtogalka ah, haddii kale waxay si fudud u horseedi doontaa khasaaro xad dhaaf ah.Awoodda qalabka PSE oo keliya ayaa la isticmaali karaa, laakiin ficil ahaan lama heli karo.
Qalabka PD (sida kamarada) wuxuu u baahan yahay 12V 12.95W si loo isticmaalo.Haddii 12V2A PSE la isticmaalo, awoodda wax soo saarku waa 24W.
Isticmaalka dhabta ah, marka hadda uu yahay 1A, khasaaraha P=1*1*20=20W.
Marka hadda uu yahay 2A, khasaaraha P=2*2*20=80W,
Waqtigan xaadirka ah, inta badan ee hadda jira, waa badan yahay khasaaraha, iyo inta badan awoodda waa la isticmaalay.Sida iska cad, aaladda PD ma heli karto awoodda ay gudbiso PSE, kamaradduna waxay yeelan doontaa koronto ku filan oo si caadi ah uma shaqeyn karto.
Dhibaatadani sidoo kale waa wax caadi ah ficil ahaan.Marar badan, waxay u muuqataa in korontadu ay ku filan tahay in la isticmaalo, laakiin khasaaraha lama xisaabiyo.Natiijo ahaan, kamaradu si caadi ah uma shaqayn karto koronto ku filan awgeed, sababtana mar walba lama heli karo.
5. caabbinta korontada POE
Dabcan, waxa aan kor ku soo sheegnay waa caabbinta fiilada shabakadda marka masaafada korantadu ay tahay 100 mitir, taas oo ah awoodda la heli karo ee masaafada ugu badan ee korontada, laakiin haddii masaafada dhabta ah ee korontada ay tahay mid yar, sida 10 kaliya. mitir, ka dibna iska caabintu waa 2Ω oo keliya, oo u dhiganta 100 mitir lumintu waa 10% oo keliya khasaaraha mitirka 100, sidaas darteed sidoo kale aad bay muhiim u tahay in si buuxda loo tixgeliyo isticmaalka dhabta ah marka la dooranayo qalabka PSE.
Iska caabbinta mitirka 100 ee fiilooyinka shabakadda ee agabyada kala duwan ee shanta nooc ee lammaane qalloocan:
1. Silig bir ah oo naxaas ah: 75-100Ω 2. Silig aluminium ah oo naxaas ah: 24-28Ω 3.
4. Xadhkaha isku xidhka naxaasta ee naxaasta leh: 42Ω 5.
Waxaa la arki karaa in fiilada wanaagsan ay tahay iska caabbinta ugu yar.Marka loo eego qaacidada Q=I²Rt, yacni, tamarta lunta inta lagu jiro habka korontada ayaa ugu yar, sidaas darteed waa sababta fiilada si fiican loo isticmaalo.Ammaanow.
Sida aan kor ku soo xusnay, qaacidada khasaaraha korontadu, Q=I²Rt, si ay korontadu gabaygu u hesho khasaaraha ugu yar ee ka imanaya korontada PSE ee ku dhammaanaysa aaladda PD, waxa loo baahan yahay ugu yaraan hadda iyo iska caabbinta ugu yar si loo gaaro saamaynta ugu fiican ee habka tamarta korontada oo dhan.
Waqtiga boostada: Mar-17-2022