Kachulukidwe ka kusintha kwa transformer kakakhala kokwera, voliyumu yake ikakhala yocheperako. Ndiye, kodi zikutanthauza kuti palibe malire apamwamba a kusintha kwa ma frequency? Ndiye, kodi voliyumuyo ingakhale yochepa kwambiri?
Yankho lake ndi loipa. Mu ntchito yeniyeni, kuchuluka kwa ma transformer a ma frequency apamwamba kumatsimikiziridwa ndi zinthu zingapo ndipo kungagawidwe m'mbali zingapo:
1, Circuit topology flyback topology: Ma transformer ali ndi ntchito yosungira ndi kusintha mphamvu, ndi ma frequency ogwiritsidwa ntchito kwambiri a 40-100kHz. Ma frequency akakhala pansi pa 40kHz, voliyumu ya chitsulo imakhala yayikulu kwambiri, zomwe zimapangitsa kuti mphamvu yamagetsi ikhale yayikulu; Ma frequency akapitirira 100kHz, kukwera kwa voliyumu komwe kumachitika chifukwa cha kutayikira kwa leak kungawononge transistor yosinthira.
Forward topology: Mtundu wamba ndi 60-150kHz, koma umafuna kulinganiza kutayika kwa maginito ndi kutayika kwa switch. Push pull/half bridge/full bridge topology: Symmetrical switch magnetic core bidirectional magnetized core, yogwira ntchito bwino kwambiri, imathandizira ma frequency apamwamba kuyambira mazana a kHz mpaka MHz, koma imafuna kapangidwe kovuta kwambiri kowongolera komanso kutentha.
2、 Makhalidwe a zinthu za magnetic core ndi monga kutayika kwa magnetic hysteresis ndi kutayika kwa eddy current. Mkati mwa mtundu winawake, kutayika kwa magnetic core kumawonjezeka ndi kuwonjezeka kwa ma frequency. Chifukwa chake, zinthu zosiyanasiyana za magnetic core ziyenera kukhala ndi ma frequency osiyanasiyana ogwiritsira ntchito kuti zitsimikizire kutayika kochepa kwa magnetic core. Mwachitsanzo, manganese zinc ferrite ndi yoyenera kugwiritsidwa ntchito pama frequency kuyambira 10 mpaka 300kHz, pomwe nickel zinc ferrite ndi yoyenera kugwiritsidwa ntchito pama frequency opitilira 1MHz.
Kachiwiri, pamene ma frequency akuwonjezeka, mphamvu yayikulu yopangira maginito iyenera kuchepetsedwa kuti tipewe kukhuta kwa maginito. Mwachitsanzo, mphamvu yopangira maginito ya DMR40 ndi 0.38T, ndipo popanga ma frequency a 100KHz, nthawi zambiri timapeza mtengo wa pafupifupi 0.2T.
3. Liwiro losinthira chipangizo chamagetsi. Transistor ya MOS ndi ya zipangizo za unipolar, yokhala ndi nthawi yozimitsa mu nanoseconds. Ma frequency ogwiritsira ntchito amatha kufika MHz, ndipo ma frequency enieni ogwiritsira ntchito ndi mazana angapo a KHz. IGBT ndi ya zipangizo za bipolar, yokhala ndi nthawi yayitali yozimitsa komanso ma frequency ogwiritsira ntchito nthawi zambiri amakhala pakati pa 40~50KHz.
4, Kuwonjezeka kwa mphamvu ndi kufalikira kwa kutentha kumabweretsa kuwonjezeka kwa kutayika kwa switch ndi drive, zomwe zimapangitsa kuchepa kwa mphamvu zonse komanso kuwonjezeka kwa kutentha. Pofuna kuonetsetsa kuti kutentha kwa chinthucho kuli mkati mwa nthawi yoyenera, tikufunika njira zina zothetsera kufalikira kwa kutentha.
5、 Pa ma frequency apamwamba, mtengo umawonjezeka chifukwa cha kutayika kwa switch, zomwe zimafuna njira zambiri zothanirana ndi kutayika kwa kutentha, zomwe zimapangitsa kuti ndalama ziwonjezeke. Kachiwiri, ma capacitor ndi ma inductor nthawi zambiri amakumana ndi kuwonongeka kwa magwiridwe antchito pama frequency apamwamba, ndipo tifunika kusankha zida zoyenera ma frequency apamwamba, zomwe zimawonjezera ndalama. Pakupanga kogwira ntchito, ndalama zimakhala zochepa, zomwe nthawi zambiri zimatsimikiza malire apamwamba a ma frequency ogwirira ntchito.
6, Makhalidwe a Chip: Ma chip olamulira a PWM nthawi zambiri amakhala ndi zofunikira za ma frequency upper limit kuti ayankhe kusintha kwa dynamic load. Izi zimatsimikiziranso kuti ma frequency osinthira a transformer ali mkati mwa mtunda winawake.
Nthawi yotumizira: Ogasiti-06-2025
