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Wigishe kwiga byinshi kubyerekeye amashanyarazi ya POE!

Inshuti nyinshi zabajije inshuro nyinshi niba amashanyarazi ya poe ahamye?Nuwuhe mugozi mwiza wo gutanga amashanyarazi?Kuberiki ukoresha poe switch kugirango uhindure kamera kamera ntagaragaza?nibindi, mubyukuri, ibyo bifitanye isano no gutakaza ingufu zamashanyarazi ya POE, byoroshye kwirengagiza mumushinga.
1. Amashanyarazi ya POE ni iki
PoE bivuga guhererekanya amakuru kubintu bimwe na bimwe bishingiye kuri IP (nka terefone ya IP, umurongo wa LAN utagira aho uhurira na AP, kamera y'urusobe, n'ibindi) nta gihindutse ku bikorwa remezo bya Ethernet Cat.5.Mugihe kimwe, irashobora kandi gutanga tekinoroji ya DC itanga ibikoresho nkibi.
Ikoranabuhanga rya PoE rirashobora kwemeza imikorere isanzwe y'urusobe rusanzwe mugihe umutekano wogukora kabili wubatswe, kandi ukagabanya ikiguzi.
Sisitemu yuzuye ya PoE ikubiyemo ibice bibiri: ibikoresho byo gutanga amashanyarazi nibikoresho byakira amashanyarazi.

Ibikoresho byo gutanga amashanyarazi (PSE): Ethernet ihindura, router, hub cyangwa ibindi bikoresho byo guhinduranya imiyoboro ishyigikira imikorere ya POE.
Igikoresho gikoreshwa (PD): Muri sisitemu yo kugenzura, ahanini ni kamera y'urusobe (IPC).
2. POE isanzwe itanga amashanyarazi
Ibipimo mpuzamahanga biheruka IEEE802.3bt bifite bibiri bisabwa:
Type Ubwoko bwa mbere: Imwe murimwe nuko ingufu zisohoka za PSE zisabwa kugera kuri 60W, imbaraga zigera kubikoresho byakira amashanyarazi ni 51W (birashobora kugaragara kumeza yavuzwe haruguru ko aya ari amakuru yo hasi), na gutakaza ingufu ni 9W.
Ubwoko bwa kabiri: PSE irasabwa kugera kubisohoka 90W, ingufu zigera kubikoresho byakira amashanyarazi ni 71W, naho gutakaza amashanyarazi ni 19W.
Duhereye ku bipimo byavuzwe haruguru, birashobora kumenyekana ko hamwe no kwiyongera kw'amashanyarazi, igihombo cy'amashanyarazi ntigihwanye n'amashanyarazi, ariko igihombo kigenda cyiyongera, none se ni gute igihombo cya PSE mubikorwa bifatika gishobora kubarwa?
3. Gutakaza ingufu za POE
Reka rero turebere hamwe uburyo gutakaza imbaraga zuyobora muri fiziki yisumbuye yisumbuye bibarwa.
Amategeko ya Joule ni ibisobanuro byerekana umubare w'ingufu z'amashanyarazi mu bushyuhe hakoreshejwe amashanyarazi.
Ibirimo ni: ubushyuhe butangwa numuyoboro unyura mu kiyobora uringaniza na kare yumuriro, ugereranije no guhangana nuyobora, kandi ugereranije nigihe gitanga ingufu.Ni ukuvuga, imikoreshereze yabakozi yatanzwe muburyo bwo kubara.
Imibare yerekana amategeko ya Joule: Q = I²Rt (ikoreshwa kumuzunguruko wose) aho Q ari imbaraga zabuze, P, I nubu, R ni ukurwanya, kandi t nigihe.
Mu mikoreshereze nyayo, kuva PSE na PD zikora icyarimwe, igihombo ntaho gihuriye nigihe.Umwanzuro nuko gutakaza ingufu za kabili y'urusobe muri sisitemu ya POE ihwanye na kare ya none kandi ikagereranya nubunini bwurwanya.Muri make, kugirango tugabanye ingufu z'umurongo wa neti, tugomba kugerageza gukora imiyoboro y'insinga ntoya no kurwanya insinga y'urusobekerane.Muri byo, akamaro ko kugabanya ibigezweho ni ngombwa cyane.
Noneho reka turebe ibipimo byihariye byurwego mpuzamahanga:
Mubipimo bya IEEE802.3af, kurwanya insinga ya neti ni 20Ω, ingufu za PSE zisabwa ni 44V, ikigezweho ni 0.35A, naho gutakaza ingufu ni P = 0.35 * 0.35 * 20 = 2.45W.
Muri ubwo buryo ,, murwego rwa IEEE802.3at, kurwanya insinga ya neti ni 12.5Ω, voltage isabwa ni 50V, ikigezweho ni 0.6A, naho gutakaza ingufu ni P = 0,6 * 0.6 * 12.5 = 4.5W.
Ibipimo byombi ntakibazo ukoresheje ubu buryo bwo kubara.Ariko, iyo IEEE802.3bt igeze, ntishobora kubarwa murubu buryo.Niba voltage ari 50V, imbaraga za 60W zigomba gusaba umuyoboro wa 1.2A.Muri iki gihe, gutakaza ingufu ni P = 1.2 * 1.2 * 12.5 = 18W, ukuyemo igihombo cyo kugera kuri PD Imbaraga zigikoresho ni 42W gusa.
4. Impamvu zo gutakaza ingufu za POE
Impamvu niyihe?
Ugereranije nibisabwa nyirizina bya 51W, hari 9W nkeya.Niki rero mubyukuri bitera ikosa ryo kubara.

Reka turebe inkingi yanyuma yiyi shusho yamakuru, kandi twitegereze neza ko ikigezweho muburyo bwa mbere bwa IEEE802.3bt buracyari 0.6A, hanyuma turebe amashanyarazi agoretse, dushobora kubona ko ibice bine byingufu zahinduwe gutanga birakoreshwa (IEEE802.3af, IEEE802. 3at ikoreshwa na joriji ebyiri zimpande zombi) Muri ubu buryo, ubu buryo bushobora gufatwa nkumuzunguruko ugereranije, umuyoboro wumuzunguruko wose ni 1.2A, ariko igihombo cyose ni kabiri ibyo muri bibiri byombi bigoretse amashanyarazi,
Kubwibyo, igihombo P = 0,6 * 0,6 * 12.5 * 2 = 9W.Ugereranije na joriji 2 zinsinga zahinduwe, ubu buryo bwo gutanga amashanyarazi buzigama 9W yingufu, kugirango PSE ishobore gutuma igikoresho cya PD cyakira ingufu mugihe ingufu zisohoka ari 60W gusa.Imbaraga zishobora kugera kuri 51W.
Kubwibyo, mugihe duhisemo ibikoresho bya PSE, tugomba kwitondera kugabanya ibyagezweho no kongera ingufu za voltage bishoboka, bitabaye ibyo bikazana byoroshye gutakaza ingufu zikabije.Imbaraga zibikoresho bya PSE byonyine birashobora gukoreshwa, ariko ntibishoboka mubikorwa.

Igikoresho cya PD (nka kamera) gikenera 12V 12.95W kugirango ikoreshwe.Niba PSV ya 12V2A ikoreshwa, imbaraga zisohoka ni 24W.
Mu mikoreshereze nyayo, iyo ikigezweho ari 1A, igihombo P = 1 * 1 * 20 = 20W.
Iyo ikigezweho ari 2A, igihombo P = 2 * 2 * 20 = 80W,
Muri iki gihe, uko ibyinshi bigenda, niko igihombo kinini, kandi imbaraga nyinshi zarakoreshejwe.Ikigaragara ni uko igikoresho cya PD kidashobora kwakira ingufu zoherejwe na PSE, kandi kamera izaba ifite amashanyarazi adahagije kandi ntishobora gukora bisanzwe.
Iki kibazo nacyo gikunze kugaragara mubikorwa.Mubihe byinshi, bisa nkaho amashanyarazi ari manini bihagije kugirango akoreshwe, ariko igihombo ntikibarwa.Nkigisubizo, kamera ntishobora gukora mubisanzwe kubera amashanyarazi adahagije, kandi impamvu ntishobora kuboneka buri gihe.
5. POE irwanya amashanyarazi
Birumvikana ko ibivuzwe haruguru ari ukurwanya umugozi wurusobe mugihe intera itanga amashanyarazi ari metero 100, nizo mbaraga ziboneka ku ntera ntarengwa yo gutanga amashanyarazi, ariko niba intera nyayo itanga ari ntoya, nka 10 gusa metero, noneho kurwanywa ni 2Ω gusa, bikwiranye no gutakaza metero 100 ni 10% gusa yo gutakaza metero 100, kubwibyo rero ni ngombwa cyane gusuzuma neza imikoreshereze nyayo muguhitamo ibikoresho bya PSE.
Kurwanya metero 100 z'insinga z'urusobe rw'ibikoresho bitandukanye by'ubwoko butanu bw'ubwoko bubiri bugoretse:
1. Umugozi wicyuma wambaye umuringa: 75-100Ω 2. Umugozi wa aluminiyumu wambaye umuringa: 24-28Ω 3. Umugozi wa feza wambaye umuringa: 15Ω
4. Umuyoboro wumuringa wuzuye umuringa: 42Ω 5. Umuyoboro wumuringa utagira ogisijeni: 9.5Ω
Birashobora kugaragara ko ibyiza bya kabili, birwanya bike.Ukurikije formula Q = I²Rt, ni ukuvuga, ingufu zabuze mugihe cyo gutanga amashanyarazi ni nkeya, niyo mpamvu rero umugozi ugomba gukoreshwa neza.Gira umutekano.
Nkuko twabivuze haruguru, formulaire yo gutakaza amashanyarazi, Q = I²Rt, kugirango amashanyarazi ya poe agire igihombo gito kuva amashanyarazi ya PSE arangirira kubikoresho byakira amashanyarazi ya PD, byibuze byibuze nibisabwa byibuze kugirango bigerweho ingaruka nziza mubikorwa byose byo gutanga amashanyarazi.


Igihe cyo kohereza: Werurwe-17-2022