Kusankha chopangira chopangira chopangidwa (Molding Choke) choyenera cha dera, osati pongoyang'ana mawonekedwe ake okha, komanso poyang'ana kwambiri magwiridwe antchito ake komanso zofooka zake m'derali.
Ma Monolithic inductors amagwiritsidwa ntchito makamaka m'ma power circuits (monga ma DC-DC converters) kuti agwire ntchito zosungira mphamvu, kusefa, ndi freewheeling. Kuti tikuthandizeni kusankha bwino, tigawa njira yosankhira m'njira zisanu zofunika izi:
1. Dziwani kukula ndi ma CD ake (Gawo 1: Kodi adzakwanira?)
Ichi ndiye muyezo wofunikira kwambiri wowunikira. Ma monolithic inductors nthawi zambiri amakhala ozungulira ngati chip.
* Zoletsa Zofanana: Yesani kukula ndi malire a kutalika kwa mapepala osungidwa pa PCB. Miyeso yofanana ndi 3.0×3.0mm, 4.0×4.0mm, 5.0×5.0mm, ndi zina zotero, ndi kutalika kuyambira 1.0mm mpaka 5.0mm.
* Kapangidwe ka Malo Olumikizirana: Tsimikizirani ngati ndi pini yokhazikika ya "two-terminal" kapena pini ya "four-terminal" yomwe cholinga chake ndi kuchepetsa kuwala kwa dzuwa.
* Dziwani: Ngakhale kutalika ndi m'lifupi mwake zili zofanana, kutalika kwake nthawi zambiri kumatsimikizira kupirira kwa mphamvu ya inductor. Onetsetsani kuti simusankha yolakwika.
2. Werengerani ndi kufananiza inductance (mtengo wa L)
Kulowa kwa magetsi kumatsimikizira kukula kwa mafunde amagetsi. Kusankha kuti ndi yayikulu kwambiri kapena yaying'ono kwambiri kumakhudza momwe magetsi amagwirira ntchito.
* Onani buku la ma chip: Ma datasheet a ma power management integrated circuits (ICs) ambiri amapereka njira zowerengera ma inductance.
Fomula yonseyi ikhoza kuyerekezeredwa ngati L={(V_{in}-V_{out})XV_{out}/{V_{in}Xf_{sw}XI_{out} XRippleRatio}}
* pomwe f_{sw} ndi ma frequency osinthira, ndipo RippleRatio nthawi zambiri imakhala 20%~30%.
* Kulekerera: Ma monolithic inductors nthawi zambiri amakhala ndi kulekerera kwa ±20% kapena ±30% (monga, magiredi a M kapena N), ndipo malire ayenera kusungidwa panthawi yowerengera.
3. Magawo apakati a mphamvu yamagetsi: "Mafunde" onse awiri ayenera kuganiziridwa
Iyi ndi gawo lomwe limakhala ndi zolakwika zambiri! Deta ya ma inductors opangidwa momangika nthawi zambiri imatchula ma currents awiri osiyana, ndipo zinthu zonse ziwiri ziyenera kukwaniritsidwa nthawi imodzi:
* Mphamvu yokhuta (I_{sat}): Malire olimba
* Tanthauzo: Mphamvu yamagetsi pamene inductance imatsika kufika pa chiŵerengero china (nthawi zambiri 10% mpaka 30% ya mtengo woyambirira).
*Njira yosankhira: I_{sat} iyenera kukhala yayikulu kuposa mphamvu ya peak current (I_{peak}) mu dera.
*Kuwerengera kwa mphamvu ya pachimake: I_{peak} = I_{out} + ΔI_L/2 (mwachitsanzo, mphamvu yotulutsa kuphatikiza theka la mphamvu ya ripple).
*Zotsatira: Ngati I_sat si yokwanira, inductor nthawi yomweyo imadzaza ndi maginito, zomwe zimapangitsa kuti inductance igwe kwambiri ndipo izi zimapangitsa kuti mphamvu yamagetsi ikwere mofulumira, zomwe zingayatse transistor yosinthira.
Mphamvu yokwera kutentha (I2 {rms}): chizindikiro cha kutentha
*Tanthauzo: Mphamvu yapakati ya muzu pomwe kutentha kwa pamwamba pa inductor kumawonjezeka ndi mtengo wodziwika (nthawi zambiri 40 ° C).
*Momwe mungasankhire: I2 {rms} iyenera kukhala yayikulu kuposa mphamvu yayikulu yotulutsa (I2 {out}) mu seti.
*Zotsatira zake: Ngati I2 {rms} sikokwanira, inductor idzatentha kwambiri, zomwe sizingochepetsa mphamvu komanso zingawononge malo olumikizirana a PCB.
4. Samalani kukana kwa DC (DCR) ndi magwiridwe antchito
DCR (Direct Current Resistance) ndi kukana kwa coil ya inductor yokha.
*Zotsatira: DCR ingayambitse kutayika kwa mkuwa (P_ {loss}=I ^ 2 XR), komwe kumasinthidwa mwachindunji kukhala kutentha ndikuchepetsa kugwiritsa ntchito mphamvu moyenera.
*Ndalama: Ngati kukula ndi mtengo zilola, DCR yaying'ono imakhala yabwino.
5. Ganizirani kuchuluka kwa kudzimva komwe kumadzimva
Chochitika cha electromagnetic induction chomwe chimachitika pamene mphamvu yamagetsi ikuyenda kudzera mu kondakitala yokha imasintha. Pamene waya wachitsulo ukugwiritsidwa ntchito kupanga coil ndipo mphamvu yamagetsi ikuyenda kudzera mu coil imasintha, chinthu chachikulu cha electromagnetic induction chidzachitika. Mphamvu ya electromotive ya coil yomwe imadzipangira yokha imalepheretsa kusintha kwa mphamvu yamagetsi ndipo imagwira ntchito yokhazikika pakukhazikika kwa mphamvu yamagetsi. Makamaka, ngati inductor ili mu mkhalidwe womwe palibe mphamvu yamagetsi imadutsa, idzayesa kuletsa mphamvu yamagetsi kuti isadutsemo pamene dera likuyatsidwa; Ngati inductor ili mu mkhalidwe womwe mphamvu yamagetsi ikudutsa, idzayesa kusunga mphamvu yamagetsi nthawi zonse dera likatsekedwa.
Nthawi yotumizira: Januwale-21-2026