Indlela yokuthuthukisa umklamo we-transformer we-PoE Power Supply

Indlela yokuthuthukisa umklamo we-transformer we-PoE Power Supply

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Amandla phezu kwe-Ethernet - Ubuchwepheshe bokuphakelwa kwamandla bubhekisela endleleni i-PSE (Imishini Yokugoqa Amandla) yokudlulisela Amandla ku-PD (Idivayisi Yamandla) ngezintambo zenethiwekhi. Izinhlelo zokusebenza ezijwayelekile, isibonelo, zithatha i-PSE switch njenge-core, zixhuma amadivayisi amaningi e-PD njenge-Access Point, i-IP Phone kanye ne-IP Camera ngezintambo zenethiwekhi, futhi i-PSE iqedela ukudluliselwa kwesignali namandla ku-PD.

Ukunikezwa kwamandla kwe-PoE kunezinzuzo ezilandelayo:

• Ukufakwa okulula nokwandiswa: Isignali namandla kudluliswa ngezintambo zenethiwekhi, futhi akukho interface yamandla edingekayo eduze kwedivayisi ye-PD

• Ukuphathwa kude: Idivayisi eyodwa ye-PSE inikeza amandla kumadivayisi amaningi e-PD ukuze kuphathwe amandla kude

• Izindleko eziphansi: umugqa wesignali kanye nomugqa wamandla kuhlanganiswe ndawonye, ​​kusale ikhebula lamandla, ngakho ikhebula lenethiwekhi aligcini nje ngokuba ngumthwali wokudlulisa isignali, kodwa futhi lithatha indima yokudlulisa amandla, ngakho-ke izindleko zokuxhuma izintambo ziyancishiswa.

• Ukuhambisana okuhle: iphrothokholi ye-PoE ehlanganisiwe iqinisekisa ukuthi amadivayisi e-PD angahambisana nanoma iyiphi i-PSE emhlabeni jikelele

Ngokuphathelene nokwakhiwa kwesekethe, i-PSE ngakwesobunxele idlulisela i-DC 44-57V ku-PD, kuyilapho i-PD ngakwesokudla iguqula ugesi uye kugesi odingekayo ngesekethe ehlayo. I-PSE ne-PD zixhunywe nge-port ye-RJ45 kanye nekhebula elisontekile elingamamitha ayi-100.

Ngokwezimo ezahlukene zokusetshenziswa kwamandla, amazinga okunikezwa kwamandla e-Ethernet e-IEEE 802.3AF, IEEE 802.3AT kanye ne-IEEE 802.3BT anyatheliswa yi-IEEE. Ikakhulukazi, indinganiso ye-IEEE 802.3BT yakhishwa ngo-2019, okuthuthukisa kakhulu amandla okunikezwa kwamandla e-PoE. I-PSE inikeza amandla angu-90W, kanti i-PD ithola ama-71W ngemuva kwamamitha ayi-100 ekhebula lenethiwekhi. Leli zinga lamandla ekilasi lesi-8 lisetshenziswa kakhulu ohlelweni lokunikezwa kwamandla eziteshini ezincane eziyisisekelo. Ngaphezu kwalokho, amazinga e-802.3BT ahambisana nezindinganiso ze-802.3AF kanye ne-802.3AT. Uma i-802.3BT PD ixhunywe ku-802.3AF kanye ne-802.3AT PSE enamandla aphansi, izosebenza esimweni samandla aphansi, okungukuthi, "esonakele".

Kule nqubo, i-PD enamandla aphansi ixhunywe ku-PSE enamandla aphezulu, futhi akukho monakalo owenzeka kudivayisi. Inqubo elandelayo yokuxhawulana iyenzeka ikakhulukazi lapho i-PSE inikeza amandla ku-PD:

Ukwakhiwa Kwesicelo Sokunikezwa Kwamandla

I-DC/DC inezinhlelo ezihlukanisiwe nezingezodwa. Ngokunikezwa kukagesi kwe-POE okuhlukanisiwe, ihlukaniswe ngezinhlobo ze-front and flyback, okuhlanganisa i-PSR (primary side feedback) kanye ne-SSR (secondary side feedback). Izinhlobo ezilandelayo ze-topology ziyahlaziywa:

Ekwakhiweni kwesekethe kwemishini ye-PD, kukhulunywa kakhulu ngamapharamitha amathathu: usayizi, ukusebenza kahle kanye ne-EMC. Khona-ke ungaxhuma kanjani izidingo zemishini ye-PD kanye nezidingo zomklamo we-transformer?

Lungiselela usayizi

• Iphuzu lokuklama 1: usayizi omncane wokunciphisa imvamisa ephezulu ye-transformer

Ebhodini lesekhethi, ungabona ukuthi ivolumu enkulu iyi-transformer, ngakho-ke ukunciphisa usayizi we-transformer kungasindisa usayizi webhodi. Imvamisa ephezulu inganciphisa usayizi we-transformer kanye nokudluliswa kwamandla e-transformer, ngakho imvamisa kusukela ku-200 KHZ ->300 KHZ ->500KHZ inganciphisa ivolumu ye-transformer.

• Iphuzu lokuklama 2: Imodi yokusebenza ye-CCM yehlisa usayizi wedivayisi

• Iphuzu lokuklama 3: Impendulo yokuqala eseceleni yokunciphisa usayizi

Khulisa Ukusebenza Kahle

I-EMC ilinganisa ukuphazamiseka okubangelwa imithombo yomsindo kumadivayisi azwelayo, okuhlanganisa izingxenye zokudlulisa kanye nemisebe. Ngakolunye uhlangothi, imithombo yokuphazamiseka kufanele incishiswe futhi izindlela zokuxhuma kufanele zilungiselelwe ngakolunye uhlangothi.

Ukuze kuncishiswe i-EMI, umthombo womsindo osesekethe kufanele uqinisekiswe kuqala. Umthombo womsindo ungahlukaniswa ngomthombo womsindo wokudlulisa kanye nomthombo womsindo wemisebe. Umthombo womsindo oqhutshwayo ngokuvamile umsindo wemvamisa ephansi ngaphakathi kwe-30MHZ, okhiqizwa ukushintsha kwensimu kagesi. Umthombo womsindo oqhubayo ngokuyinhloko ukuthi isenzo sokushintsha kweshubhu yamandla sizoholela ekuguqulweni kwe-voltage yezinga lomthombo we-MOS, okuzobangela ukuthi i-transformer idlulisele ukuguqulwa kwe-voltage ohlangothini lwesibili. Ukuthuthukisa ukumelana nokushayela kwe-MOS kunganciphisa isivinini sokushintsha, kodwa ukulahlekelwa kokushayela kuzokwanda. Noma engeza amasekethe okumunca ukuze unciphise ukujikijela kwemvamisa ephezulu. Amapharamitha alahlekile e-transformer anethonya elikhulu ku-EMI, isibonelo, i-transformer Cp (insimu kagesi ejikelezayo eyinhloko) ithinta ama-voltage spikes kanye ne-current ripple.

Umthombo womsindo okhishwa imisebe umsindo ongaphezu kwama-30M, okuwukuphazamiseka kwensimu kazibuthe yesikhala. Yakhiwe yiluphu yamanje yemvamisa ephezulu. Iluphu yemvamisa ephezulu ibhekisela kuluphu oluseceleni oluyinhloko kanye neluphu oluseceleni lwesibili lwe-transformer.