Inductance ndi gawo lofunikira pamagetsi a DC / DC. Pali zinthu zambiri zomwe muyenera kuziganizira posankha inductor, monga mtengo wa inductance, DCR, kukula, ndi machulukitsidwe apano. Makhalidwe a machulukidwe a inductors nthawi zambiri samamvetsetsa ndipo amayambitsa mavuto. Pepalali lifotokoza momwe inductance imafikira pakuchulukira, momwe machulukitsidwe amakhudzira dera, komanso njira yodziwira kuchuluka kwa inductance.
Kuchuluka kwa inductance kumayambitsa
Choyamba, mvetsetsani mozama kuti inductance saturation ndi chiyani, monga momwe tawonetsera pa Chithunzi 1:
Chithunzi 1
Tikudziwa kuti mphamvu ikadutsa pa koyilo mu Chithunzi 1, koyiloyo ipanga mphamvu yamaginito;
Maginito apakati adzakhala ndi maginito pansi pa zochita za maginito, ndipo maginito amkati amazungulira pang'onopang'ono.
Pamene mphamvu ya maginito imakhala ndi maginito, mayendedwe a maginito amafanana ndi mphamvu ya maginito, ngakhale mphamvu ya maginito yakunja ikuwonjezeka, mphamvu ya maginito ilibe mphamvu ya maginito yomwe imatha kuzungulira, ndipo inductance imalowa m'malo odzaza. .
Kuchokera kumalingaliro ena, pamapindikira a maginito omwe akuwonetsedwa mu Chithunzi 2, mgwirizano pakati pa kachulukidwe ka maginito B ndi mphamvu ya maginito H amakumana ndi chilinganizo chakumanja pa chithunzi 2:
Kuchuluka kwa maginito kukafika ku Bm, kuchuluka kwa maginito sikumawonjezekanso kwambiri ndi kuchuluka kwa mphamvu ya maginito, ndipo inductance imafika pamlingo.
Kuchokera pa ubale pakati pa inductance ndi permeability µ, titha kuwona:
Pamene inductance yadzaza, µm idzachepetsedwa kwambiri, ndipo pamapeto pake inductance idzachepetsedwa kwambiri ndipo mphamvu yopondereza yamakono idzatayika.
Chithunzi 2
Malangizo pakuzindikira kuchuluka kwa inductance
Kodi pali maupangiri aliwonse owerengera kuchuluka kwa inductance muzogwiritsa ntchito?
Ikhoza kufotokozedwa mwachidule m'magulu akuluakulu awiri: kuwerengera kwamalingaliro ndi kuyesa kuyesa.
☆Kuwerengera kwamalingaliro kumatha kuyamba kuchokera pamlingo wokulirapo wa maginito komanso kuchuluka kwapakatikati pakali pano.
☆Chiyeso choyesera chimangoyang'ana kwambiri mawonekedwe amakono a inductance ndi njira zina zoyambira.
Njirazi zafotokozedwa pansipa.
Werengetsani kuchuluka kwa maginito
Njirayi ndiyoyenera kupanga inductance pogwiritsa ntchito maginito pachimake. Magawo apakati amaphatikiza kutalika kwa maginito a dera, malo ogwira ntchito Ae ndi zina zotero. Mtundu wa maginito pachimake umatsimikiziranso kalasi yofananira ndi maginito, ndipo maginito azinthu amapanga zofunikira pakutayika kwa maginito pachimake ndi kuchuluka kwa maginito.
Ndi zida izi, titha kuwerengera kuchuluka kwa maginito kusinthasintha molingana ndi momwe zidapangidwira, motere:
Pochita, kuwerengera kumatha kukhala kosavuta, kugwiritsa ntchito ui m'malo mwa ur; Pomaliza, poyerekezera ndi kuchuluka kwa machulukitsidwe a maginito, titha kuweruza ngati inductance yomwe idapangidwayo ili ndi chiwopsezo cha kuchuluka.
Werengetsani pazipita inductance panopa
Njirayi ndiyoyenera kupanga madera mwachindunji pogwiritsa ntchito ma inductors omalizidwa.
Ma topologies osiyanasiyana ali ndi njira zosiyanasiyana zowerengera ma inductance current.
Tengani Buck chip MP2145 mwachitsanzo, ikhoza kuwerengedwa motsatira ndondomeko yotsatirayi, ndipo zotsatira zowerengeka zikhoza kufananizidwa ndi mtengo wa inductance kuti mudziwe ngati inductance idzakhutitsidwa.
Kuweruza ndi inductive current waveform
Njirayi ndiyonso njira yodziwika bwino komanso yothandiza kwambiri muzochita zauinjiniya.
Kutengera chitsanzo cha MP2145, chida choyerekeza cha MPSmart chimagwiritsidwa ntchito poyerekezera. Kuchokera ku mawonekedwe ofananirako, zitha kuwoneka kuti pamene inductor siidzaza, inductor panopa ndi mafunde a katatu omwe ali ndi malo otsetsereka. Inductor ikakhutitsidwa, mawonekedwe apano a inductor adzakhala ndi kupotoza koonekeratu, komwe kumachitika chifukwa cha kuchepa kwa inductance pambuyo pakuchulukira.
Muzochita zauinjiniya, titha kuwona ngati pali kusokonekera kwa mawonekedwe amakono a inductance kutengera izi kuweruza ngati inductance yadzaza.
Pansipa pali mawonekedwe oyezera pa MP2145 Demo board. Zitha kuwoneka kuti pali kupotoza koonekeratu pambuyo pa kukhutitsidwa, zomwe zimagwirizana ndi zotsatira zofananitsa.
Yezerani ngati inductance yatenthedwa modabwitsa ndikumvetsera kuyimba muluzu kwachilendo
Pali zochitika zambiri muzochita zauinjiniya, mwina sitingadziwe mtundu weniweni wapakatikati, ndizovuta kudziwa kukula kwa inductance, ndipo nthawi zina sikoyenera kuyesa inductance pano; Panthawiyi, titha kudziwanso ngati kuchuluka kwachulukidwe kwachitika poyesa ngati kutentha kwatsika kwachilendo, kapena kumvetsera ngati kukuwa kwachilendo.
Maupangiri angapo odziwira kuchuluka kwa inductance afotokozedwa apa. Ndikukhulupirira kuti zinali zothandiza.
Nthawi yotumiza: Jul-07-2023
