Uyithuthukisa kanjani idizayini ye-transformer ye-PoE Power Supply

Uyithuthukisa kanjani idizayini ye-transformer ye-PoE Power Supply

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Amandla phezu kwe-Ethernet - Ubuchwepheshe bokuhlinzeka Amandla bubhekisela endleleni ye-PSE (Isisetshenziswa Sokuxubha Amandla) yokudlulisa Amandla ku-PD (Idivayisi Yamandla) ngamakhebuli enethiwekhi. Izinhlelo zokusebenza ezijwayelekile, isibonelo, zithatha iswishi ye-PSE njengomongo, xhuma amadivayisi amaningi e-PD njenge-Access Point, I-IP Phone nekhamera ye-IP ngamakhebula enethiwekhi, futhi i-PSE iqedela isignali namandla okudlulisela ku-PD.

Ukunikezwa kwamandla kwe-PoE kunezinzuzo ezilandelayo:

• Ukufakwa kalula nokunwetshwa: Isiginali namandla kudluliselwa ngezintambo zenethiwekhi, futhi asikho isixhumi esibonakalayo samandla esidingekayo eduze kwedivayisi ye-PD.

• Ukuphathwa kwesilawuli kude: Idivayisi EYODWA ye-PSE inikezela ngamandla kumadivayisi amaningi e-PD okulawula amandla okukude

• Izindleko eziphansi: ulayini wesiginali kanye nolayini wamandla kuhlanganiswe kokukodwa, kushiye ngaphandle ikhebula lamandla, ngakho-ke intambo yenethiwekhi ayiyona nje inkampani yokudlulisa isignali, kodwa futhi yenza indima yokudlulisa amandla, ngakho izindleko zezintambo ziyancipha.

• Ukuhambisana okuhle: iphrothokholi ehlanganisiwe ye-PoE iqinisekisa ukuthi amadivayisi e-PD angakwazi ukusebenzisana nanoma iyiphi i-PSE esikalini somhlaba.

Mayelana nesakhiwo sesifunda, i-PSE kwesokunxele idlulisela i-DC 44-57V ku-PD, kuyilapho i-PD kwesokudla iguqulela ugesi odingekayo ngesekethe eyehlayo.  I-PSE ne-PD zixhunywe ngembobo ye-RJ45 kanye nekhebula elisontekile elingu-100m. 

Ngokwezimo ezihlukene zokusetshenziswa kwamandla, i-IEEE 802.3AF, IEEE 802.3AT kanye ne-IEEE 802.3BT Ethernet amazinga okunikezwa kwamandla ashicilelwe yi-IEEE. Ikakhulukazi, izinga le-IEEE 802.3BT lakhululwa ngo-2019, elithuthukisa kakhulu amandla okunikezwa kwamandla kwe-PoE. I-PSE inikeza amandla angu-90W, futhi i-PD ithola u-71W ngemva kwamamitha angu-100 ekhebula lenethiwekhi. Leli zinga lamandla esigaba 8 lisetshenziswa kakhulu ohlelweni lokuphakela amandla eziteshini ezincane. Ngaphezu kwalokho, amazinga angu-802.3BT abuyela emuva ahambisana namazinga angu-802.3AF kanye ne-802.3AT. Uma i-802.3BT PD ixhunywe ku-802.3AF yamandla aphansi kanye ne-802.3AT PSE, izosebenza esimweni samandla aphansi, okungukuthi, "eyehlisiwe".

Kule nqubo, i-PD enamandla aphansi ixhunywe ku-PSE ngamandla aphezulu, futhi akukho monakalo owenzekayo kudivayisi. Inqubo elandelayo yokuxhawula izandla ibonakala kakhulu lapho i-PSE inikeza amandla ku-PD:

I-Architecture Yohlelo Lokuhlinzeka Amandla

I-DC/DC inezinhlelo ezizimele nezingezodwa. Ngokuphakelwa kwamandla e-POE ehlukanisiwe, ihlukaniswe yaba ama-topology aya phambili ne-flyback, okuhlanganisa i-PSR (impendulo yohlangothi oluyinhloko) kanye ne-SSR (impendulo yohlangothi lwesibili). Ama-topology alandelayo ayahlaziywa: 

Ekwakhiweni kwesifunda semishini ye-PD, imingcele emithathu ithinteka kakhulu: usayizi, ukusebenza kahle kanye ne-EMC. Manje-ke ungaxhuma kanjani izidingo zemishini ye-PD kanye nezidingo zokuklama i-transformer?

Lungiselela usayizi

• Iphuzu loku-1 lokuklama: i-transformer high-frequency ukunciphisa usayizi omncane

Ebhodini lesifunda, ungabona ukuthi ivolumu enkulu i-transformer, ngakho ukunciphisa ubukhulu be-transformer kungagcina ubukhulu bebhodi. Imvamisa ephezulu inganciphisa usayizi we-transformer kanye nokudluliswa kwamandla we-transformer, ngakho-ke imvamisa isuka ku-200 KHZ ->300 KHZ ->I-500KHZ inganciphisa ivolumu ye-transformer.

• Iphoyinti le-Design 2: Imodi yokusebenza ye-CCM yehlisa usayizi wedivayisi

• Iphuzu lokudizayina 3: Impendulo yohlangothi lwangempela ukuze unciphise usayizi

Khulisa Ukusebenza kahle

I-EMC ikala ukuphazamiseka okubangelwa imithombo yomsindo kumadivayisi azwelayo, okuhlanganisa ukuqhutshwa kwezingxenye zemisebe. Ngakolunye uhlangothi, imithombo yokuphazamiseka kufanele incishiswe futhi izindlela zokuhlanganisa kufanele zithuthukiswe ngakolunye uhlangothi.

Ukuze kuncishiswe i-EMI, umthombo womsindo kusekethe kufanele uqinisekiswe kuqala. Umthombo womsindo ungahlukaniswa ngomthombo womsindo we-conduction kanye nomthombo womsindo we-radiation. Umthombo womsindo owenziwe ngokuvamile uwumsindo ophansi ophakathi kuka-30MHZ, okhiqizwa ukushintsha kwenkundla kagesi. Umthombo womsindo oqhubayo ikakhulukazi ukuthi isenzo sokushintsha ishubhu yamandla sizoholela ekuguqulweni kwe-voltage yezinga lomthombo we-MOS, okuzokwenza ukuthi i-transformer idlulisele ukuguqulwa kwe-voltage ohlangothini lwesibili. Ukuthuthukisa ukumelana nokushayela kwe-MOS kunganciphisa isivinini sokushintsha, kodwa ukulahlekelwa ukushayela kuzokhula. Noma engeza amasekhethi okumunca ukuze unciphise ama-oscillations aphezulu. Amapharamitha adukile we-transformer anethonya elikhulu ku-EMI, isibonelo, i-transformer Cp (inkambu kagesi ejikajikayo eyinhloko) ithinta ama-voltage spikes kanye ne-ripple yamanje.

Umthombo womsindo okhazimulayo umsindo ongaphezu kuka-30M, okuwukuphazamiseka kwendawo kazibuthe. Yakhiwe yiluphu yamanje yefrikhwensi ephezulu. Iluphu yefrikhwensi ephezulu isho iluphu eseceleni eyisisekelo kanye neluphu eseceleni yesibili ye-transformer.

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