Ukukhetha i-inductor ebunjiwe efanele (i-Molding Choke) yesekethe, hhayi ngokubukeka kwayo kuphela, kodwa ngokugxila ekusebenzeni kwayo okuguquguqukayo kanye nokulinganiselwa ngokomzimba kwesekethe.
Ama-inductor e-Monolithic asetshenziswa kakhulu kumasekethe kagesi (njengabaguquli be-DC-DC) ukwenza imisebenzi yokugcina amandla, ukuhlunga, kanye ne-freewheeling. Ukuze sikusize wenze ukukhetha okuhle kakhulu, sizohlukanisa inqubo yokukhetha ibe yizinyathelo ezinhlanu ezibalulekile ezilandelayo:
1. Nquma ubukhulu obubonakalayo kanye nokupakishwa (Isinyathelo 1: Ingabe kuzofanelana?)
Lena yindlela yokuhlola eyisisekelo kakhulu. Ama-inductor e-Monolithic ngokuvamile ayizakhiwo ezijwayelekile ezifana nonxande njenge-chip.
* Izithiyo Zobukhulu: Linganisa usayizi kanye nemikhawulo yokuphakama kwama-pad agciniwe ku-PCB. Ubukhulu obuvamile buhlanganisa u-3.0×3.0mm, 4.0×4.0mm, 5.0×5.0mm, njll., ngokuphakama okusukela ku-1.0mm kuya ku-5.0mm.
* Umklamo Wesiphetho: Qinisekisa ukuthi ngabe kuyiphini ejwayelekile “yesiphetho esikabili” noma iphini “yesiphetho esimine” ehloselwe ukunciphisa imisebe.
* Qaphela: Ngisho noma ubude nobubanzi kufana, ukuphakama kuvame ukunquma ukubekezelela amandla kwe-inductor. Qiniseka ukuthi awukhethi okungalungile.
2. Bala futhi ufanise i-inductance (inani le-L)
I-inductance inquma ubukhulu be-current ripple. Ukukhetha ukuthi inkulu kakhulu noma incane kakhulu kuzothinta ukusebenza kahle kokunikezwa kwamandla.
* Bheka incwadi yemiyalelo yama-chip: Ama-datasheet amaningi e-power management integrated circuits (ICs) ahlinzeka ngamafomula anconywayo okubala amanani e-inductance.
Ifomula evamile ingalinganiswa ngokuthi L={(V_{in}-V_{out})XV_{out}/{V_{in}Xf_{sw}XI_{out} XRippleRatio}}
* lapho i-f_{sw} iyimvamisa yokushintsha, kanti i-RippleRatio ngokuvamile ingu-20%~30%.
* Ukubekezelelana: Ama-inductor e-Monolithic ngokuvamile anokubekezelelana okungu-±20% noma ±30% (isb., amamaki e-M noma e-N), futhi kufanele kugcinwe imajini ngesikhathi sokubala.
3. Amapharamitha wamanje ayinhloko: Womabili “ama-current” kumele acatshangelwe
Lena yingxenye evame kakhulu ukwenza amaphutha! Ishidi ledatha lama-inductors abunjiwe ahlanganisiwe livame ukucacisa ama-currents amabili ahlukene, futhi zombili izimo kumele zihlangatshezwe ngasikhathi sinye:
* Umthamo wokugcwala (I_{sat}): Umkhawulo oqinile
* Incazelo: Ugesi lapho i-inductance yehla iye esilinganisweni esithile (ngokuvamile u-10% kuya ku-30% wenani lokuqala).
*Indlela yokukhetha: I_{sat} kumele ibe nkulu kunomsinga we-peak (I_{peak}) kusekethe.
*Ukubalwa kwamanje okuphakama: I_{peak} = I_{out} + ΔI_L/2 (okungukuthi, umkhawulo wamanje ophumayo kanye nengxenye yamanje okhuphukayo).
*Imiphumela: Uma i-I_sat inganele, i-inductor izogcwala ngokushesha ngamandla kazibuthe, okubangela ukwehla okukhulu kwe-inductance futhi kuholele ekukhuphukeni okusheshayo kwamandla kagesi, okungase kushise i-transistor eshintshayo.
Ukuphakama kwamanje kwezinga lokushisa (I2 {rms}): inkomba yokushisa
*Incazelo: Isilinganiso samandla esikwele sempande lapho izinga lokushisa lobuso be-inductor likhuphuka khona ngenani elicacisiwe (ngokuvamile 40 ° C).
*Indlela yokukhetha: I-I2 {rms} kumele ibe nkulu kunomkhawulo wamanje wokukhipha (I2 {out}) kusekethe.
*Umphumela: Uma i-I2 {rms} inganele, i-inductor izoshisa ngokweqile, okungagcini nje ngokunciphisa ukusebenza kahle kodwa futhi okungalimaza amalunga e-PCB solder.
4. Naka ukumelana kwe-DC (DCR) kanye nokusebenza kahle kwayo
I-DCR (Ukumelana Kwamanje Okuqondile) ukumelana kwekhoyili ye-inductor uqobo.
*Umthelela: I-DCR ingabangela ukulahlekelwa yithusi (P_ {loss}=I ^ 2 XR), okushintshwa ngqo kube ukushisa futhi kunciphisa ukusebenza kahle kwamandla.
*Ibhalansi: Uma usayizi nezindleko zivuma, i-DCR encane ingcono.
5. Cabanga ngemvamisa yokuziphendulela
Isenzakalo sokungeniswa kwe-electromagnetic esenzeka lapho ugesi ogeleza nge-conductor uqobo ushintsha. Lapho ucingo lwensimbi lusetshenziswa ukwenza ikhoyili kanye nogesi ogeleza ngekhoyili ushintsha, kuzokwenzeka isenzakalo esibalulekile sokungeniswa kwe-electromagnetic. Amandla e-electromotive aphindaphindayo e-coil azibangela wona ayaphazamisa ushintsho lwamanje futhi adlala indima ekuqiniseni ugesi. Ngokukhethekile, uma i-inductor isesimweni lapho kungekho gesi odlula khona, izozama ukuvimba ugesi ukuthi ungagelezi kuyo lapho isekethe ivuliwe; Uma i-inductor isesimweni lapho ugesi udlula khona, izozama ukugcina ugesi oqhubekayo lapho isekethe inqanyuliwe.
Isikhathi sokuthunyelwe: Jan-21-2026