Q1: Kodi ntchito yaikulu ya ma capacitor a mafilimu pakupanga magetsi a magalimoto atsopano amphamvu ndi yotani?
A: Monga ma capacitor a DC-link, ntchito yawo yayikulu ndikuyamwa ma bus pulse currents apamwamba, kusinthasintha kwa magetsi osalala, ndikuteteza zida zosinthira za IGBT/SiC MOSFET ku voltage yocheperako ndi ma current surges.
Q2: Nchifukwa chiyani nsanja ya 800V imafuna ma capacitor opanga mafilimu apamwamba kwambiri?
A: Pamene magetsi a basi akukwera kuchoka pa 400V mpaka 800V, zofunikira za magetsi opirira capacitor, mphamvu ya ripple current, komanso kutentha zimachepa kwambiri. Ma ESR otsika komanso mphamvu yamagetsi yopirira kwambiri ya ma capacitor a filimu ndi oyenera kwambiri m'malo okhala ndi magetsi ambiri.
Q3: Kodi ubwino waukulu wa ma capacitor a filimu ndi wotani kuposa ma capacitor a electrolytic m'magalimoto atsopano amphamvu?
A: Amapereka mphamvu yolimba kwambiri, ESR yotsika, samakhala ndi mphamvu ya polar, ndipo amakhala ndi moyo wautali. Ma frequency awo omveka bwino ndi apamwamba kwambiri kuposa a ma capacitor a electrolytic, zomwe zimagwirizana ndi zofunikira pakusintha kwa ma SiC MOSFET.
Q4: N’chifukwa chiyani ma capacitor ena amayambitsa kukwera kwa magetsi mosavuta mu ma inverter a SiC?
A: ESR yokwera komanso ma frequency otsika a resonant amalepheretsa kuyamwa bwino mphamvu ya ripple ya ma frequency apamwamba. SiC ikasintha mofulumira, ma voltage amawonjezeka, zomwe zingawononge chipangizocho.
Q5: Kodi ma capacitor a filimu amathandiza bwanji kuchepetsa kukula kwa makina oyendetsa magetsi?
A: Mu kafukufuku wa Wolfspeed, inverter ya 40kW SiC inkafuna ma capacitor asanu ndi atatu okha (poyerekeza ndi ma capacitor 22 a electrolytic a ma IGBT okhala ndi silicon), zomwe zinachepetsa kwambiri kuchuluka kwa mphamvu ya PCB ndi kulemera kwake.
Q6: Kodi ndi zofunikira ziti zatsopano zomwe ma capacitor a DC-Link amafunikira pa kusintha kwa ma frequency ambiri?
A: Kutsika kwa ESR kumafunika kuti kuchepetse kutayika kwa switching, kuchuluka kwa ma resonant frequency kumafunika kuti kuchepetse kugwedezeka kwa ma frequency apamwamba, komanso kuthekera kopirira bwino kwa dv/dt kumafunikanso.
Q7: Kodi kudalirika kwa moyo wa ma capacitor a filimu kumayesedwa bwanji?
A: Zimatengera kukhazikika kwa kutentha kwa zinthuzo (monga filimu ya polypropylene) ndi kapangidwe ka kutentha. Mwachitsanzo, mndandanda wa YMIN MDP umawongolera moyo wa chinthucho kutentha kwambiri mwa kukonza kapangidwe ka kutentha.
Q8: Kodi ESR ya ma capacitor a filimu imakhudza bwanji magwiridwe antchito a dongosolo?
A: Kutsika kwa ESR kumachepetsa kutayika kwa mphamvu panthawi yosinthira, kumachepetsa kupsinjika kwa magetsi, komanso kumawongolera mwachindunji magwiridwe antchito a inverter.
Q9: N’chifukwa chiyani ma capacitor a filimu ndi oyenera kwambiri malo oyendera magalimoto omwe amagwedezeka kwambiri?
Yankho: Kapangidwe kawo kolimba, kopanda electrolyte yamadzimadzi, kumapereka kukana kwabwino kwambiri kwa kugwedezeka poyerekeza ndi ma capacitor a electrolytic, ndipo kuyika kwawo kopanda polarity kumapangitsa kuti zikhale zosinthasintha.
Q10: Kodi kuchuluka kwa ma capacitor a filimu omwe amalowa m'ma inverters amagetsi ndi kotani?
A: Mu 2022, mphamvu yoyika ya ma inverter okhala ndi capacitor ya filimu idafika mayunitsi 5.1117 miliyoni, zomwe zidapanga 88.7% ya mphamvu yonse yoyika ya makina owongolera magetsi. Makampani otsogola monga Tesla ndi Nidec adapanga 82.9%.
Q11: N’chifukwa chiyani ma capacitor a filimu amagwiritsidwanso ntchito mu ma inverter a photovoltaic?
A: Zofunikira kuti galimoto ikhale yodalirika komanso yokhalitsa ndi zofanana ndi zomwe zimagwiritsidwa ntchito m'magalimoto, ndipo zimafunikanso kupirira kusinthasintha kwa kutentha kwakunja.
Q12: Kodi mndandanda wa MDP umathetsa bwanji mavuto a kupsinjika kwa magetsi m'magawo a SiC?
A: Kapangidwe kake kotsika ka ESR kamachepetsa kusinthasintha kwa switching overshoot, kumathandizira kuti dv/dt ipirire ndi 30%, komanso kumachepetsa chiopsezo cha kusweka kwa magetsi.
Q13: Kodi mndandanda uwu umagwira ntchito bwanji kutentha kwambiri?
A: Pogwiritsa ntchito zipangizo zokhazikika kutentha kwambiri komanso kapangidwe kothandiza kochotsa kutentha, timaonetsetsa kuti mphamvu ya zinthuzo iwonongeka ndi zosakwana 5% pa kutentha kwa 125°C.
Q14: Kodi mndandanda wa MDP umakwaniritsa bwanji kuchepetsedwa kwa mphamvu?
A: Ukadaulo watsopano wa thin-film umawonjezera mphamvu pa voliyumu ya unit, zomwe zimapangitsa kuti mphamvu ikhale yochulukirapo kuposa avareji ya makampani, zomwe zimapangitsa kuti mapangidwe a ma drive amagetsi ang'onoang'ono azitha kupangidwa.
Q15: Mtengo woyamba wa ma capacitor a filimu ndi wokwera kuposa wa ma capacitor a electrolytic. Kodi amapereka phindu pa mtengo kuposa moyo wonse?
A: Inde. Ma capacitor a filimu amatha kukhala ndi moyo wautali popanda kusinthidwa, pomwe ma capacitor a electrolytic amafunika kukonzedwa nthawi zonse. Pamapeto pake, ma capacitor a filimu amapereka ndalama zochepa.
Nthawi yotumizira: Okutobala-14-2025