Ukukhetha i-molded inductor efanelekileyo (Molding Choke) yesekethe, kungekuphela nje ngokubonakala kwayo, kodwa ngokugxila ekusebenzeni kwayo okuguquguqukayo kunye nemida yomzimba kwisekethe.
Ii-inductors ze-monolithic zisetyenziswa kakhulu kwiisekethe zamandla (ezifana nee-DC-DC converters) ukwenza imisebenzi yokugcina amandla, ukucoca, kunye ne-freewheeling. Ukuze sikuncede wenze ukhetho olufanelekileyo, siza kuhlalutya inkqubo yokukhetha ibe ngamanyathelo amahlanu aphambili alandelayo:
1. Chonga ubungakanani kunye nokupakisha (Inyathelo 1: Ngaba iza kufaneleka?)
Le yeyona ndlela isisiseko yokuvavanya. Ii-inductors ze-monolithic zihlala ziyizakhiwo ezilinganayo ezifana ne-chip-rectangular.
* Imida yoBume: Linganisa ubungakanani kunye nemida yokuphakama kwee-pad ezigciniweyo kwi-PCB. Ubukhulu obuqhelekileyo buquka i-3.0×3.0mm, 4.0×4.0mm, 5.0×5.0mm, njl., ubude buqala kwi-1.0mm ukuya kwi-5.0mm.
* Uyilo lweTerminal: Qinisekisa ukuba yipini eqhelekileyo "ye-two-terminal" okanye yipini "ye-four-terminal" eyenzelwe ukunciphisa imitha.
* Qaphela: Nokuba ubude nobubanzi buyafana, ukuphakama kudla ngokugqiba ukunyamezela amandla kwe-inductor. Qiniseka ukuba awukhethi engalunganga.
2. Bala kwaye uthelekise i-inductance (ixabiso le-L)
I-inductance imisela ubukhulu be-current ripple. Ukukhetha ukuba inkulu kakhulu okanye incinci kakhulu kuya kuchaphazela ukusebenza kakuhle kombane.
* Jonga incwadi yemiyalelo yetshiphu: Amaphepha edatha eesekethe ezininzi zolawulo lwamandla (ii-IC) abonelela ngeefomula ezicetyiswayo zokubala amaxabiso e-inductance.
Ifomula ngokubanzi ingaqikelelwa ngolu hlobo: L={(V_{in}-V_{out})XV_{out}/{V_{in}Xf_{sw}XI_{out} XRippleRatio}}
* apho i-f_{sw} ilutshintsho oluqhelekileyo, kwaye iRippleRatio idla ngokuba yi-20%~30%.
* Ukunyamezelana: Ii-inductors ze-Monolithic zihlala zinokunyamezelana kwe-±20% okanye ±30% (umz., ii-M okanye ii-N grades), kwaye umda kufuneka ugcinwe ngexesha lokubala.
3. Iiparameter zamandla angundoqo: Zombini "ii-currents" maziqwalaselwe
Le yeyona nxalenye ithanda ukuba neempazamo ezininzi! Iphepha ledatha lee-inductors ezibunjiweyo ezihlanganisiweyo lidla ngokuchaza ii-currents ezimbini ezahlukeneyo ezilinganisiweyo, kwaye zombini ezi meko kufuneka zifezekiswe ngaxeshanye:
* Umsinga wokugcwalisa (I_{sat}): Umda onzima
* Inkcazo: Umbane xa i-inductance ihla iye kwisilinganiso esithile (ngesiqhelo yi-10% ukuya kwi-30% yexabiso lokuqala).
*Indlela yokukhetha: I_{sat} mayibe nkulu kunomsinga wencochoyi (I_{peak}) kwisekethe.
*Ubalo lwamandla ombane oluyincochoyi: I_{peak} = I_{out} + ΔI_L/2 (oko kukuthi, amandla ombane ophumayo kunye nesiqingatha samandla ombane ojikelezayo).
*Iziphumo: Ukuba i-I_sat ayanelanga, i-inductor iya kugcwala ngoko nangoko ngamandla kamagnethi, nto leyo ebangela ukwehla okukhulu kwe-inductance kwaye ikhokelele ekunyukeni ngokukhawuleza kombane, nto leyo enokutshisa i-transistor etshintshayo.
Ukunyuka kobushushu (I2 {rms}): isalathisi sokufudumeza
*Inkcazo: Umsinga wesikwere ophakathi kwengcambu apho ubushushu bomphezulu we-inductor bunyuka ngexabiso elithile (ngesiqhelo yi-40 ° C).
*Indlela yokukhetha: I2 {rms} mayibe nkulu kuneyona current iphezulu yokuphuma (I2 {out}) kwisekethe.
*Isiphumo: Ukuba i-I2 {rms} ayanelanga, i-inductor iya kushushu kakhulu, nto leyo enganciphisi nje kuphela ukusebenza kakuhle kodwa inokonakalisa amalungu e-PCB solder.
4. Nika ingqalelo kwi-DC resistance (DCR) kunye nokusebenza kakuhle kwayo
I-DCR (i-Direct Current Resistance) kukuxhathisa kwe-inductor coil ngokwayo.
*Impembelelo: I-DCR inokubangela ukulahleka kobhedu (P_ {loss}=I ^ 2 XR), oluguqulwa ngokuthe ngqo lube bubushushu kwaye lunciphise ukusebenza kakuhle kwamandla.
*Ibhalansi: Xa ubungakanani kunye nexabiso zivuma, i-DCR encinci ingcono.
5. Cinga rhoqo ngokuzivuselela
Isiganeko sokungenisa i-electromagnetic esenzeka xa umbane ohamba nge-conductor ngokwawo utshintsha. Xa ucingo lwesinyithi lusetyenziswa ukwenza i-coil kwaye umbane ohamba nge-coil utshintsha, kuya kwenzeka isiganeko esibalulekileyo sokungenisa i-electromagnetic. Amandla e-electromotive abuyela umva e-coil athintela utshintsho lombane kwaye adlala indima ekuzinziseni umbane. Ngokukodwa, ukuba i-inductor ikwimeko apho kungekho mbane udlulayo, iya kuzama ukuthintela umbane ukuba ungadluli kuyo xa isekethe ivuliwe; Ukuba i-inductor ikwimeko apho umbane udlula khona, iya kuzama ukugcina umbane oqhubekayo xa isekethe iqhawukile.
Ixesha leposi: Jan-21-2026