Ekuphuhlisweni kwetshaja ye-6.6 kW ekwibhodi (i-OBC), izinto zemagnethi (ii-inductors, ii-transformers) azibangeli nje kuphela ubunzima kunye nomthamo kodwa zikwayizinto ezibalulekileyo ekumiseleni ukusebenza kakuhle kunye nokusebenza kwe-EMI. Ngokusekelwe kwiindlela zamva nje zoshishino kunye namava asebenzayo, sishwankathele la macebiso asebenzayo okukhetha izinto zemagnethi ze-OBC, okukunceda ufezekise ibhalansi efanelekileyo phakathi "kokusebenza, ubungakanani, kunye neendleko."
ICEBISO1.Ukhetho lwe-PFC Inductor — “Lungcono Kunkulu Kunoluncinci,” Ukugxila kwi-DC Bias
Kuyilo olunamandla aphezulu lwe-6.6 kW, ingxaki eqhelekileyo nge-PFC inductor asikokuba “i-inductance engonelanga” kodwa “kukugcwala phantsi kombane ophezulu.”
* I-Practical Mnemonic: “nika ingqalelo kwi-curve, kungekhona ixabiso eliqhelekileyo.”
* Ii-inductors ezininzi zibonisa i-inductance ephezulu kubushushu begumbi (25°C), kodwa xa ziphantsi kombane we-DC bias we-30A-50A, i-inductance yazo inokwehla ngaphezulu kwe-50%.
*Xa ukhetha icandelo, soloko ucela i-current ye-LI (inductance-current) kumthengisi. Qinisekisa ukuba i-inductance ihlala ingaphezulu kwe-80% yexabiso elifunekayo kumbane wakho ophambili (umz., 55A).
* Ukukhetha Izinto:
Ukusukela Eyona Ibalaseleyo: Khetha ii-cores ze-Sendust okanye ze-iron-nickel-molybdenum magnetic powder, ezibonisa ukumelana okunamandla kokugcwala, ukunyuka kobushushu obuphantsi, kodwa ngexabiso eliphezulu.
Ukulandela ukusebenza kakuhle kweendleko: Khetha i-ferrite enolawulo oluchanekileyo lwe-air gap ngexabiso eliphantsi, kodwa qaphela ilahleko zamandla e-eddy (imiphumo ye-edge) kwi-air gap. Kucetyiswa ukusebenzisa i-multi-strand winding okanye i-Litz wire ukunciphisa ilahleko.
Icebiso 2:I-LLC Transformer – Ukusebenzisa “i-Leakage Inductance” endaweni ye-“Resonant Inductance”
Le yeyona ndlela iphambili yokunciphisa iindleko kwi-6.6kW OBC (ingakumbi kwi-CLLC resonant converter engasemva).
*Ukusebenza okusebenzayo:
*Musa ukuthenga i-resonant inductor ngokwahlukeneyo, kodwa ngobuchule yonyusa ukuvuza kwe-transformer ngokwenza ngokwezifiso ulwakhiwo lwe-transformer (njengokulungisa umgama phakathi kwe-primary windings kunye ne-secondary windings, usebenzisa amathambo ahlukeneyo).
*Icebiso: Sebenzisa le inductance yokuvuza njenge-resonant inductance (L_r) ye-resonant cavity.
*Ingeniso:
*Umthamo: Inani lee-cores zemagnethi ezizimeleyo lincitshisiwe, kwaye umthamo ungancitshiswa ngaphezulu kwe-20%.
*Ixabiso: Ukususa isiseko esinye semagnethi kunye nokujika kunciphisa iindleko zeBOM.
*Ukusasazeka kobushushu: Iitransformer zihlala zineemeko ezingcono zokusasazeka kobushushu (ezifana nokugqunywa kunye nokudibana neepleyiti ezipholisiweyo ngamanzi), nto leyo eyenza kube lula ukuzisusa ubushushu kunee-inductors ezincinci ezizimeleyo.
Icebiso 3:Uyilo lweThermal – “Ukumelana neThermal” Kubaluleke Ngakumbi Kunokunyuka kweThermal”
Ngexesha lesigaba sovavanyo lweprototype, ungafumanisa ukuba umphezulu we-inductor ushushu kakhulu (>100 ℃). Ingaba oku kuqhelekile?
*Izakhono zokugweba:
*Musa ukulinganisa ubushushu bomphezulu kuphela, jonga ubushushu bangaphakathi beendawo ezishushu.
*Ifomula yokubala: T {hotspot}=T {surface}+(R {th} times P {loss})
*Icebiso: Xa ukhetha, buza umthengisi nge-coefficient yabo yokumelana nobushushu (R_ {th}). Ukuba ayifumaneki, ingasebenza xa umthwalo uphelele de kufikelelwe kumlinganiselo wobushushu kwaye iskenwe nge-thermal imager.
*Amanyathelo okusasaza ubushushu:
*Ukutywina: Ukusebenzisa iglu eqhuba ubushushu ukuhambisa ubushushu kwiqokobhe langaphandle (ipleyiti esezantsi) okwangoku yeyona ndlela iphambili yokusasaza ubushushu kwi-OBC.
*Uyilo: Beka i-PFC inductor enokuvelisa ubushushu obuphezulu kufutshane kangangoko kunokwenzeka kwipleyiti epholisiweyo ngamanzi okanye kwipayipi yokusasaza ubushushu.
Icebiso 4:Ukujongana nemingeni exhaphakileyo - Nika ingqalelo "kwimpembelelo yolusu" kunye nenkqubo yokusonga
Njengoko i-OBC switching frequency isanda (i-PFC ifikelela kwi-40kHz-100kHz, i-LLC iphezulu), ilahleko ze-AC (I ^ 2R_ {ac}) zihlala zibulala ngaphezu kwelahleko ze-DC.
*Izakhono zokukhetha ukujija ucingo:
*Umbane ophezulu ophantsi (PFC): Kucetyiswa ukusebenzisa ucingo oluthe tyaba lobhedu ukuze ujike ngokuthe nkqo. I-coefficient yokuzalisa yemigca ethe tyaba iphezulu, kwaye isiphumo sesikhumba kwi-mid frequency band (amashumi e-kHz) singcono kuneso semigca ejikelezayo.
*I-frequency ephezulu (i-transformer/i-resonant inductor): I-Litz wire kufuneka isetyenziswe. I-Leeds wire ilukiwe ngeentambo ezininzi ze-insulated wire ezibhityileyo kakhulu, ezinokunyusa kakhulu indawo yomphezulu we-conductor kwaye zixhathise "impembelelo yesikhumba" ye-high-frequency currents.
*Isikhokelo sokuphepha imigibe: Ukuba ucingo olunye olukhulu lobhedu lusetyenziswa ukuvuthuza i-inductor ephindaphindayo ukonga ixesha, ukunyuka kobushushu okulinganisiweyo kunokuba ngaphezulu kwama-30 ℃ ngaphezulu kwexabiso elibaliweyo, nto leyo ekhokelela ekwaluphaleni komaleko we-insulation okanye kwi-short circuit.
Wamkelekile ukuba wabelane nathi ngoluvo lwakho!
Ixesha leposi: Disemba-18-2025