Saaxiibo badan ayaa si isdaba joog ah u waydiiyey in korontada PoE ay deggan tahay? Waa maxay fiilada u fiican sahayda korontada ee PoE? Waa maxay sababta kamaradu wali u soo bandhigin marka uu ku shaqaynayo furaha PoE? Iyo wixii la mid ah, kuwani waxay dhab ahaantii la xiriiraan koronto luminta korontada POE, taas oo si sahlan loo indho-indheyn karo mashaariicda.
1. Waa maxay korontada POE
PoE waxaa loola jeedaa tignoolajiyada bixinta korantada DC ee qaar ka mid ah terminaalka IP-ku salaysan (sida teleefannada IP-ga, barta marinka shabakadda deegaanka ee wireless-ka APs, kamaradaha shabakadda, iwm.) iyada oo aan wax isbeddel ah lagu samayn Cat Ethernet ee jira. 5 kaabayaasha kaabayaasha.
Tiknoolajiyada PoE waxay xaqiijin kartaa amniga fiilooyinka qaabaysan ee jira iyadoo la hubinayo hawlgalka caadiga ah ee shabakadaha jira, yaraynta kharashyada.
Nidaamka PoE oo dhammaystiran wuxuu ka kooban yahay laba qaybood: qalabka korontada ku shaqeeya ee dhammaadka ah iyo qalabka dhammaadka helaya.
Qalabka Korontada (PSE): Qalabka Ethernet, router-ka, hub-yada, ama aaladaha beddelka shabakadaha kale ee taageera shaqada POE.
Aaladda awood helida (PD): Nidaamka la socodka, inta badan waa kamarad shabakadeed (IPC).
2. Heerka sahayda korantada POE
Heerka caalamiga ah ee ugu dambeeyay IEEE802.3bt wuxuu leeyahay laba shuruudood:
Nooca koowaad: Mid iyaga ka mid ah wuxuu u baahan yahay PSE si uu u gaaro awood wax soo saar ah oo ah 60W, iyada oo awooddu ay gaarto qalabka helaya ee 51W (sida ku cad shaxda sare, tani waa xogta ugu hooseysa), iyo luminta awoodda 9W.
Habka labaad wuxuu u baahan yahay PSE si uu u gaaro awood wax soo saar ah oo ah 90W, oo leh awood 71W ah oo gaareysa qalabka helaya iyo luminta awoodda 19W.
Marka la eego heerarka sare, waxaa la arki karaa in korontadu ay kor u kacdo, lumista korantadu maaha mid u dhiganta tamarta, laakiin halkii ay ka sii korodho. Haddaba sidee baa khasaaraha PSE loogu xisaabin karaa codsiyo la taaban karo?
3. POE korantada khasaaraha
Haddaba aan marka hore eegno sida fiisigiska dugsiga dhexe u xisaabiyo luminta awoodda siliga.
Sharciga Joule waa sharci qiyaas ahaan u sharaxaya beddelka tamarta korantada ee tamarta kulaylka iyadoo la samaynayo hadda.
Dulucda waxa ay tahay: Kulaylka ka dhalanaya kan hadda maraaya kaarigu waxa uu la mid yahay awoodda afar geesoodka ah ee hadda jirta, caabbinta daariyaha, iyo wakhtiga korontadu. Taasi waa, isticmaalka shaqaalaha ee la abuuray inta lagu jiro habka xisaabinta.
Sharciga Joule tibaaxaha xisaabeed: Q=I ² Rt (oo lagu dabaqi karo dhammaan wareegyada), halka Q ay tahay khasaaraha awoodda P, I waa kan hadda, R waa caabbinta, tna waa wakhtiga.
Isticmaalka dhabta ah, sida PSE iyo PD ay u shaqeeyaan isku mar, khasaaruhu waa ka madax banaan waqti. Gabagabada ayaa ah in nidaamka POE, awoodda luminta fiilada shabakadu ay si toos ah ugu dhigan tahay awoodda quadratic ee hadda iyo si toos ah u dhigma xajmiga caabbinta. Si fudud loo dhigo, si loo yareeyo isticmaalka awoodda fiilada shabakadda, waa inaan isku daynaa inaan hoos u dhigno hadda ee fiilada iyo caabbinta fiilada shabakadda sida ugu macquulsan. Muhiimadda dhimista hadda ayaa si gaar ah muhiim u ah.
Haddaba bal aynu eegno halbeegyada gaarka ah ee halbeegyada caalamiga ah:
Heerka IEEE802.3af, caabbinta fiilada shabakadu waa 20 Ω, tamarta wax soo saarka PSE ee loo baahan yahay waa 44V, hadda waa 0.35A, awoodda luminta P=0.35 * 0.35 * 20=2.45W.
Sidoo kale, heerka IEEE802.3at, caabbinta fiilada shabakadu waa 12.5 Ω, tamarta loo baahan yahay waa 50V, hadda waa 0.6A, awoodda luminta P=0.6 * 0.6 * 12.5=4.5W.
Dhib kuma jirto adeegsiga habkan xisaabinta ee labada heer. Laakiin marka ay timaado heerka IEEE802.3bt, laguma xisaabin karo sidan oo kale. Haddii danabku yahay 50V oo awoodda lagu gaaro 60W waxay u baahan tahay inay noqoto 1.2A hadda, markaa awoodda khasaaradu waa P=1.2 * 1.2 * 12.5=18W. Ka-goynta khasaaraha, awoodda lagu gaadho aaladda PD waa 42W oo keliya.
4. Sababaha khasaaraha korontada ee POE
Haddaba waa maxay sababta dhabta ah?
Baahida dhabta ah ee 51W waxaa lagu dhimay 9W ee tamarta korantada. Haddaba maxaa keenay qaladka xisaabinta.
Qalabka Korontada (PSE): Qalabka Ethernet, router-ka, hub-yada, ama aaladaha beddelka shabakadaha kale ee taageera shaqada POE.
Aaladda awood helida (PD): Nidaamka la socodka, inta badan waa kamarad shabakadeed (IPC).
2. Heerka sahayda korantada POE
Heerka caalamiga ah ee ugu dambeeyay IEEE802.3bt wuxuu leeyahay laba shuruudood:
Nooca koowaad: Mid iyaga ka mid ah wuxuu u baahan yahay PSE si uu u gaaro awood wax soo saar ah oo ah 60W, iyada oo awooddu ay gaarto qalabka helaya ee 51W (sida ku cad shaxda sare, tani waa xogta ugu hooseysa), iyo luminta awoodda 9W.
Habka labaad wuxuu u baahan yahay PSE si uu u gaaro awood wax soo saar ah oo ah 90W, oo leh awood 71W ah oo gaareysa qalabka helaya iyo luminta awoodda 19W.
Marka la eego heerarka sare, waxaa la arki karaa in korontadu ay kor u kacdo, lumista korantadu maaha mid u dhiganta tamarta, laakiin halkii ay ka sii korodho. Haddaba sidee baa khasaaraha PSE loogu xisaabin karaa codsiyo la taaban karo?
3. POE korantada khasaaraha
Haddaba aan marka hore eegno sida fiisigiska dugsiga dhexe u xisaabiyo luminta awoodda siliga.
Sharciga Joule waa sharci qiyaas ahaan u sharaxaya beddelka tamarta korantada ee tamarta kulaylka iyadoo la samaynayo hadda.
Dulucda waxa ay tahay: Kulaylka ka dhalanaya kan hadda maraaya kaarigu waxa uu la mid yahay awoodda afar geesoodka ah ee hadda jirta, caabbinta daariyaha, iyo wakhtiga korontadu. Taasi waa, isticmaalka shaqaalaha ee la abuuray inta lagu jiro habka xisaabinta.
Sharciga Joule tibaaxaha xisaabeed: Q=I ² Rt (oo lagu dabaqi karo dhammaan wareegyada), halka Q ay tahay khasaaraha awoodda P, I waa kan hadda, R waa caabbinta, tna waa wakhtiga.
Isticmaalka dhabta ah, sida PSE iyo PD ay u shaqeeyaan isku mar, khasaaruhu waa ka madax banaan waqti. Gabagabada ayaa ah in nidaamka POE, awoodda luminta fiilada shabakadu ay si toos ah ugu dhigan tahay awoodda quadratic ee hadda iyo si toos ah u dhigma xajmiga caabbinta. Si fudud loo dhigo, si loo yareeyo isticmaalka awoodda fiilada shabakadda, waa inaan isku daynaa inaan hoos u dhigno hadda ee fiilada iyo caabbinta fiilada shabakadda sida ugu macquulsan. Muhiimadda dhimista hadda ayaa si gaar ah muhiim u ah.
Haddaba bal aynu eegno halbeegyada gaarka ah ee halbeegyada caalamiga ah:
Heerka IEEE802.3af, caabbinta fiilada shabakadu waa 20 Ω, tamarta wax soo saarka PSE ee loo baahan yahay waa 44V, hadda waa 0.35A, awoodda luminta P=0.35 * 0.35 * 20=2.45W.
Sidoo kale, heerka IEEE802.3at, caabbinta fiilada shabakadu waa 12.5 Ω, tamarta loo baahan yahay waa 50V, hadda waa 0.6A, awoodda luminta P=0.6 * 0.6 * 12.5=4.5W.
Dhib kuma jirto adeegsiga habkan xisaabinta ee labada heer. Laakiin marka ay timaado heerka IEEE802.3bt, laguma xisaabin karo sidan oo kale. Haddii danabku yahay 50V oo awoodda lagu gaaro 60W waxay u baahan tahay inay noqoto 1.2A hadda, markaa awoodda khasaaradu waa P=1.2 * 1.2 * 12.5=18W. Ka-goynta khasaaraha, awoodda lagu gaadho aaladda PD waa 42W oo keliya.
4. Sababaha khasaaraha korontada ee POE
Haddaba waa maxay sababta dhabta ah?
Baahida dhabta ah ee 51W waxaa lagu dhimay 9W ee tamarta korantada. Haddaba maxaa keenay qaladka xisaabinta.
Waxaa la arki karaa in sida ugu wanaagsan ee fiilada, ay ugu yar tahay caabbinta, marka loo eego qaaciddada Q=I ² Rt, taas oo macnaheedu yahay in korontadu ay lumiso inta lagu jiro habka bixinta korontada, sidaas darteed waa sababta loo baahan yahay in la isticmaalo fiilooyinka. si fiican. Waxaa lagu talinayaa in la isticmaalo fiilooyinka Qaybta 6 sida ikhtiyaar badbaado leh.
Sida aan kor ku soo sheegnay, qaacidada awoodda khasaaraha, Q=I ² Rt, si loo yareeyo khasaaraha u dhexeeya terminalka korantada PSE iyo PD qalabka helaya, hadda ugu yar iyo caabbinta ayaa loo baahan yahay si loo gaaro waxqabadka ugu fiican oo dhan awoodda oo dhan. habka sahayda.
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Waqtiga boostada: Meey-30-2023