UCanwin yiNkampani yeNkampani yoTshintsho lwaMandla kunye noMvelisi woMbane woMbane
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UCanwin yiNkampani yeNkampani yoTshintsho lwaMandla kunye noMvelisi woMbane woMbane
Uluphucula njani uyilo lwe-transformer yePoE Power Supply
Amandla phezu kwe-Ethernet - I-teknoloji yokubonelela ngombane ibhekisela kwindlela ye-PSE (Izixhobo zokucoca amandla) ukuhambisa i-Power kwi-PD (Isixhobo saMandla) ngeentambo zenethiwekhi. Izicelo eziqhelekileyo, umzekelo, thatha utshintsho lwe-PSE njengengundoqo, qhagamshela izixhobo ezininzi zePD ezifana ne-Access Point, i-IP Phone kunye ne-IP Camera ngokusebenzisa iintambo zenethiwekhi, kunye ne-PSE igqiba isignali kunye nokuhanjiswa kwamandla kwi-PD.
Uluphucula njani uyilo lwe-transformer yePoE Power Supply
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Amandla phezu kwe-Ethernet - I-teknoloji yokubonelela ngombane ibhekisela kwindlela ye-PSE (Izixhobo zokucoca amandla) ukuhambisa i-Power kwi-PD (Isixhobo saMandla) ngeentambo zenethiwekhi. Izicelo eziqhelekileyo, umzekelo, thatha utshintsho lwe-PSE njengengundoqo, qhagamshela izixhobo ezininzi zePD ezifana ne-Access Point, i-IP Phone kunye ne-IP Camera ngokusebenzisa iintambo zenethiwekhi, kunye ne-PSE igqiba isignali kunye nokuhanjiswa kwamandla kwi-PD.
Ubonelelo lwamandla lwe-PoE lunezi nzuzo zilandelayo:
• Ufakelo olulula kunye nokwandiswa: Umqondiso kunye namandla ahanjiswa ngeentambo zothungelwano, kwaye akukho interface yamandla efunekayo kwisixhobo sePD.
• Ulawulo olukude: Isixhobo ESINYE se-PSE sinika amandla kwizixhobo ezininzi zePD zolawulo lwamandla okude
• Ixabiso eliphantsi: umgca wesignali kunye nomgca wombane udityaniswe kwelinye, ushiya ngaphandle kwentambo yamandla, ngoko ke intambo yenethiwekhi ayiyena kuphela umthwali wokuhanjiswa kwesignali, kodwa iphinda ithathe indima yokuhanjiswa kwamandla, ngoko ke iindleko zocingo ziyancitshiswa.
• Ukuhambelana kakuhle: iprotocol edibeneyo ye-PoE iqinisekisa ukuba izixhobo zePD zinokuhambelana nayo nayiphi na i-PSE kwinqanaba lehlabathi.
Ngokubhekiselele kwi-architecture yesiphaluka, i-PSE ngakwesobunxele ihambisa i-DC 44-57V kwi-PD, ngelixa i-PD ngasekunene iguqula umbane ofunekayo kumbane ofunekayo kunye nesekethe yokuhla. I-PSE kunye ne-PD zidibaniswe nge-port ye-RJ45 kunye ne-100m ephothiweyo ye-pair cable.
Ngokweemeko ezahlukeneyo zokusetyenziswa kwamandla, i-IEEE 802.3AF, IEEE 802.3AT kunye ne-IEEE 802.3BT Ethernet imigangatho yonikezelo lwamandla ipapashwa yi-IEEE. Ngokukodwa, umgangatho we-IEEE 802.3BT ukhutshwe ngo-2019, ophucula kakhulu amandla ombane we-PoE. I-PSE inika amandla e-90W, kwaye iPD ifumana i-71W emva kweemitha ezili-100 zentambo yenethiwekhi. Lo mgangatho wesi-8 wamandla usetyenziswa ikakhulu kwinkqubo yonikezelo lwamandla kwizikhululo ezincinci. Ukongeza, imigangatho ye-802.3BT ngasemva iyahambelana ne-802.3AF kunye nemigangatho ye-802.3AT. Xa i-802.3BT PD ixhunywe kumandla aphantsi 802.3AF kunye ne-802.3AT PSE, iya kusebenza kwindawo ephantsi kwamandla, oko kukuthi, "ihlaziywe".
Kule nkqubo, i-PD enamandla aphantsi ixhunywe kwi-PSE ngamandla aphezulu, kwaye akukho monakalo owenzekayo kwisixhobo. Le nkqubo ilandelayo yokuxhawula izandla ibonwa ikakhulu xa i-PSE inika amandla kwiPD:
Ulwakhiwo lweSicelo soBonelelo lwaMandla
I-DC/DC inezikim ezizimeleyo nezingezizo zodwa. Unikezelo lwamandla lwe-POE oluzimeleyo, lwahlulahlulwe lwaya phambili kunye ne-flyback topology, kubandakanywa i-PSR (impendulo yecala eliphambili) kunye ne-SSR (ingxelo yecala lesibini). Ezi zihloko zilandelayo ziyacazululwa:
Kwi-architecture yesiphaluka sezixhobo zePD, iiparitha ezintathu zixhalabele kakhulu: ubukhulu, ukusebenza kakuhle kunye ne-EMC. Emva koko ukudibanisa njani iimfuno zezixhobo zePD kunye neemfuno zoyilo lwe-transformer?
Lungiselela ubungakanani
• Inqaku loyilo 1: i-transformer high-frequency ukunciphisa ubungakanani obuncinci
Kwibhodi yesiphaluka, unokubona ukuba umthamo omkhulu ngumguquli, ngoko ukunciphisa ubukhulu be-transformer kunokugcina ubungakanani bebhodi. I-frequency ephezulu inokunciphisa ubungakanani be-transformer kunye nokuhanjiswa kwamandla e-transformer, ngoko ke ukuphindaphinda ukusuka kwi-200 KHZ ->300KHZ ->I-500KHZ inokunciphisa umthamo we-transformer.
• Inqaku loyilo 2: Imowudi yokusebenza ye-CCM yehlisa ubungakanani besixhobo
• Inqaku loyilo 3: Ingxelo yecala lokuqala ukunciphisa ubungakanani
Yandisa Ukusebenza kakuhle
I-EMC ilinganisa uphazamiseko olubangelwa yimithombo yengxolo kwizixhobo ezinovakalelo, kubandakanywa ukuqhutywa kunye namalungu emitha. Kwelinye icala, imithombo yongenelelo kufuneka incitshiswe kwaye iindlela zokudibanisa kufuneka ziphuculwe kwelinye icala.
Ukuze kuncitshiswe i-EMI, umthombo wengxolo kwisekethe kufuneka uqinisekiswe kuqala. Umthombo wengxolo unokwahlulwa ube ngumthombo wengxolo yokuqhuba kunye nomthombo wengxolo yemitha. Umthombo wengxolo oqhutywayo ngokuqhelekileyo yingxolo ephantsi yobuninzi ngaphakathi kwe-30MHZ, eveliswa kukutshintsha kwendawo yombane. Umthombo wengxolo oqhubayo ubukhulu becala kukuba isenzo sokutshintsha ityhubhu yamandla siya kukhokelela ekuguqulweni kwe-voltage yenqanaba lomthombo weMOS, okuya kubangela ukuba i-transformer idlulisele ukuguqulwa kombane kwicala lesibini. Ukuphucula ukuchasana nokuqhuba kwe-MOS kunokunciphisa isantya sokutshintsha, kodwa ilahleko yokuqhuba iya kwanda. Okanye yongeza iisekethe zokufunxa ukunciphisa i-oscillations ephezulu. Iiparamitha ezilahlekileyo ze-transformer zinempembelelo enkulu kwi-EMI, umzekelo, i-Cp ye-transformer (intsimi yombane ehamba phambili) ichaphazela i-voltage spikes kunye ne-ripple yangoku.
Umthombo wengxolo oyimitha yingxolo engaphezulu kwe-30M, eluphazamiso lwendima yemagnethi yendawo. Iqulunqwe yi-loop yangoku ye-high-frequency current. I-loop ye-high-frequency loop ibhekisela kwi-loop yecala eliphambili kunye ne-second side loop ye-transformer.
