Pakupanga chojambulira cha 6.6 kW chomwe chili mu board (OBC), zigawo zamaginito (ma inductors, ma transformers) sizimangothandiza kwambiri pa voliyumu ndi kulemera kokha komanso ndizofunikira kwambiri pakudziwa momwe zinthu zilili komanso momwe zinthu zilili pa EMI. Kutengera ndi zomwe zikuchitika mumakampani komanso zomwe zachitika kale, tafotokoza mwachidule malangizo othandiza otsatirawa posankha zigawo zamaginito za OBC, zomwe zingakuthandizeni kupeza bwino pakati pa "ntchito, kukula, ndi mtengo."
TIP1.Kusankha kwa PFC Inductor — “Kwabwino Kwambiri Kuposa Kwang'ono,” Kuyang'ana pa DC Bias
Mu kapangidwe ka mphamvu yayikulu ya 6.6 kW, vuto lofala kwambiri ndi PFC inductor si "kusakwanira kwa inductance" koma "kukhuta pansi pa mphamvu yayikulu."
* Mnemonic Yothandiza: "samalani ndi kupotoka, osati mtengo wodziwika.".
* Ma inductor ambiri amakhala ndi inductance yambiri kutentha kwa chipinda (25°C), koma akakumana ndi DC bias current ya 30A-50A, inductance yawo imatha kutsika ndi kupitirira 50%.
*Mukasankha gawo, nthawi zonse pemphani current ya LI (inductance-current) kuchokera kwa wogulitsa. Onetsetsani kuti inductance ikupitirira 80% ya mtengo wofunikira pa peak current yanu (monga, 55A).
* Kusankha Zinthu:
Kutsata Ultimate: Sankhani Sendust kapena iron-nickel-molybdenum magnetic powder cores, zomwe zimawonetsa kukana kwamphamvu kwa saturation, kutentha kochepa, koma pamtengo wokwera.
Kutsatira njira zogwiritsira ntchito ndalama moyenera: Sankhani ferrite yokhala ndi njira yowongolera bwino kusiyana kwa mpweya pamtengo wotsika, koma samalani ndi kutayika kwa mphamvu ya eddy current (zotsatira za m'mphepete) pa kusiyana kwa mpweya. Ndikofunikira kugwiritsa ntchito multi-strand winding kapena Litz wire kuti muchepetse kutayika.
Langizo lachiwiri:Transformer ya LLC - Kugwiritsa Ntchito "Kutulutsa Madzi" m'malo mwa "Kutulutsa Madzi Ochokera M'madzi"
Iyi ndi njira yodziwika bwino yochepetsera ndalama ya 6.6kW OBC (makamaka ya chosinthira cha resonant cha CLLC chakumbuyo).
*Ntchito yothandiza:
*Musagule chotulutsira mpweya chozungulira chotchedwa resonant padera, koma onjezerani mwadala mphamvu ya chotulutsira mpweya posintha kapangidwe ka chotulutsira mpweya (monga kusintha mtunda pakati pa ma windings oyambira ndi achiwiri, pogwiritsa ntchito mafupa ogawika).
*Langizo: Gwiritsani ntchito njira yotulutsira madzi ngati njira yotulutsira madzi (L_r) ya resonant cavity.
*Ndalama:
*Voliyumu: Chiwerengero cha maginito odziyimira pawokha chachepetsedwa, ndipo voliyumu ikhoza kuchepetsedwa ndi oposa 20%.
*Mtengo: Kuchotsa chimango chimodzi cha maginito ndikuchikulunga kumachepetsa mtengo wa BOM.
*Kutaya kutentha: Ma transformer nthawi zambiri amakhala ndi njira zabwino zotaya kutentha (monga kuphimba ndi kukhudza mbale zoziziritsidwa ndi madzi), zomwe zimapangitsa kuti kutentha kukhale kosavuta kuposa ma inductor ang'onoang'ono odziyimira pawokha.
Langizo 3:Kapangidwe ka Kutentha - "Kukana Kutentha" N'kofunika Kwambiri Kuposa "Kukwera kwa Kutentha"
Pa nthawi yoyesera chitsanzo, mutha kupeza kuti pamwamba pa inductor pali kutentha kwambiri (>100 ℃). Kodi izi ndi zachilendo?
*Maluso oweruza:
*Osangoyesa kutentha kwa pamwamba, yang'anani kutentha kwa mkati mwa malo otentha.
*Fomu yowerengera: T {hotspot}=T {surface}+(R {th} times P {loss})
*Langizo: Mukasankha, funsani wogulitsayo za coefficient yawo yokana kutentha (R_ {th}). Ngati singapezeke, ikhoza kugwiritsidwa ntchito mokwanira mpaka kutentha kukhale kofanana ndi kusinthasintha ndikusakidwa ndi chithunzi cha kutentha.
*Njira zoyeretsera kutentha:
*Kutseka: Kugwiritsa ntchito guluu woyendetsa kutentha kuti usamutse kutentha kupita ku chipolopolo chakunja (mbale yapansi) pakadali pano ndiyo njira yodziwika bwino kwambiri yochotsera kutentha kwa OBC.
*Kapangidwe: Ikani PFC inductor yokhala ndi mphamvu yopangira kutentha kwambiri pafupi ndi mbale yoziziritsidwa ndi madzi kapena njira yotulutsira kutentha.
Langizo lachinayi:Kuthana ndi mavuto omwe amakumana nawo pafupipafupi - Samalani ndi "zotsatira za khungu" ndi njira yozungulira
Pamene ma frequency osinthira a OBC akuwonjezeka (PFC ikufika pa 40kHz-100kHz, LLC ndi yokwera), kutayika kwa AC (I ^ 2R_ {ac}) nthawi zambiri kumakhala koopsa kuposa kutayika kwa DC.
*Maluso osankha waya wopindika:
*Mafunde otsika kwambiri (PFC): Ndikofunikira kugwiritsa ntchito waya wathyathyathya wa mkuwa poyimitsa molunjika. Kuchuluka kwa kudzaza kwa mizere yathyathyathya ndi kwakukulu, ndipo zotsatira za khungu mu mzere wapakati wa frequency (makumi a kHz) ndizabwino kuposa za mizere yozungulira.
*Ma frequency apamwamba (transformer/resonant inductor): Waya wa Litz uyenera kugwiritsidwa ntchito. Waya wa Leeds umalukidwa ndi zingwe zingapo za waya woonda kwambiri wotetezedwa, zomwe zimatha kuwonjezera kwambiri malo a kondakitala ndikuletsa "zotsatira za khungu" za mafunde amphamvu.
*Chitsogozo chopewa misampha: Ngati waya umodzi wokhuthala wamkuwa ugwiritsidwa ntchito kupondaponda chotulutsira mpweya chapamwamba kuti musunge nthawi, kukwera kwa kutentha komwe kumayesedwa kungakhale kokwera kuposa 30 ℃ kuposa mtengo wowerengedwa, zomwe zimapangitsa kuti insulation layer ikule kapena kufupika kwa magetsi.
Takulandirani kuti mugawane nafe malingaliro anu!
Nthawi yotumizira: Disembala-18-2025