I-inductance yinxalenye ebalulekileyo yobonelelo lwamandla e-DC/DC.Kukho izinto ezininzi ekufuneka ziqwalaselwe xa ukhetha i-inductor, njengexabiso le-inductance, i-DCR, ubungakanani, kunye ne-saturation yangoku.Iimpawu zokugcwala kwee-inductors zihlala zingaqondwa kwaye zibangela ingxaki.Eli phepha liza kuxubusha indlela i-inductance ifikelela ngayo kwi-saturation, indlela i-saturation echaphazela ngayo isiphaluka, kunye nendlela yokufumanisa i-inductance saturation.
I-inductance saturation ibangela
Okokuqala, qonda ngokucacileyo ukuba yintoni i-inductance saturation, njengoko kubonisiwe kuMfanekiso 1:
Umfanekiso woku-1
Siyazi ukuba xa i-current idluliswa kwikhoyili kwi-Figure 1, i-coil iya kuvelisa intsimi yamagnetic;
Undoqo wamagnetic uya kutsalwa phantsi kwesenzo semagnethi, kwaye imimandla yangaphakathi yamagnetic iya kujikeleza kancinci.
Xa i-core magnetic imagnetic ngokupheleleyo, i-direction of magnetic domain iyafana nemagnethi, nokuba i-magnetic field yangaphandle iye yanda, i-magnetic core ayinayo i-magnetic domain engakwazi ukujikeleza, kwaye i-inductance ingena kwi-saturated state. .
Ukusuka kwenye indawo yokujonga, kwigophe lamagnetic eliboniswe kuMfanekiso 2, ubudlelwane phakathi koxinzelelo lwemagnethi eguquguqukayo B kunye namandla ombane wemagnethi H idibana nefomula ngasekunene kuMfanekiso 2:
Xa uxinaniso lwemagnethi lufikelela kwi-Bm, ukuxinana kwemagnethi akusanyuka kakhulu ngokunyuka kwamandla ombane, kwaye i-inductance ifikelela kwi-saturation.
Ukusuka kubudlelwane phakathi kwe-inductance kunye nokungena µ, sinokubona:
Xa i-inductance igcwele, i-µm iya kuncitshiswa kakhulu, kwaye ekugqibeleni i-inductance iya kuncitshiswa kakhulu kwaye ukukwazi ukucinezela umsinga kuya kulahleka.
Umfanekiso wesi-2
Iingcebiso zokumisela i-inductance saturation
Ngaba kukho naziphi na iingcebiso zokugweba i-inductance saturation kwizicelo ezisebenzayo?
Inokushwankathelwa kwiindidi ezimbini eziphambili: ukubala kwethiyori kunye novavanyo lovavanyo.
☆Ubalo lwethiyori lunokuqala ukusuka kubuninzi be-magnetic flux density kunye neyona nto ikhoyo ngoku.
☆Uvavanyo lovavanyo lugxile ikakhulu kwi-inductance waveform yangoku kunye nezinye iindlela zokuqala zesigwebo.
Ezi ndlela zichazwe ngezantsi.
Bala ukuxinana kwemagnethi
Le ndlela ifanelekile ukuyila i-inductance usebenzisa i-core magnetic.Iiparamitha ezingundoqo ziquka ubude besiphaluka semagneti le, indawo esebenzayo Ae njalo njalo.Uhlobo lwemagnethi engundoqo lukwamisela ibakala lemagnethi ehambelanayo, kunye nesixhobo sozibuthe senza amalungiselelo ahambelanayo ekulahlekeni kondoqo wemagnethi kunye nokugcwala koxinzelelo lwemagnethi.
Ngezi zixhobo, sinokubala obona buninzi bobuninzi bemagnethi ngokweyona meko yoyilo, ngolu hlobo lulandelayo:
Ngokwesiqhelo, ukubala kunokwenziwa lula, kusetyenziswa i-ui endaweni ye-ur;Okokugqibela, xa kuthelekiswa noxinaniso lwe-saturation flux ye-magnetic material, sinokugweba ukuba i-inductance eyiliweyo inomngcipheko wokuzaliswa.
Bala ubuninzi be-inductance yangoku
Le ndlela ifanelekile ukuyila isiphaluka ngokuthe ngqo ngokusebenzisa i-inductors egqityiweyo.
Ii-topology zeesekethe ezahlukeneyo zineefomyula ezahlukeneyo zokubala i-inductance current.
Thatha i-Buck chip MP2145 njengomzekelo, ingabalwa ngokwefomula elandelayo, kwaye umphumo obalwayo unokuthelekiswa nexabiso lenkcazo ye-inductance ukugqiba ukuba i-inductance iya kuhluthwa.
Ukugweba ngokuguquguquka kwamaza angoku
Le ndlela ikwayeyona ndlela ixhaphakileyo nesebenzayo kubunjineli.
Ukuthatha iMP2145 njengomzekelo, isixhobo sokulinganisa seMPSmart sisetyenziselwa ukulinganisa.Ukususela kwi-waveform yokulinganisa, kunokubonwa ukuba xa i-inductor ingahluthi, i-inductor yangoku i-wave triangular kunye ne-slope ethile.Xa i-inductor igcwele, i-waveform yangoku ye-inductor iya kuba nokuphazamiseka okucacileyo, okubangelwa ukuhla kwe-inductance emva kokuzaliswa.
Kumsebenzi wobunjineli, sinokujonga ukuba kukho ukugqwethwa kwe-waveform yangoku ye-inductance esekwe koku ukugweba ukuba i-inductance igcwele na.
Apha ngezantsi kulinganiswe i-waveform kwibhodi yeDemo yeMP2145.Ingabonwa ukuba kukho ukuphazamiseka okucacileyo emva kokuzaliswa, okuhambelana neziphumo zokulinganisa.
Qinisekisa ukuba i-inductance ishushu ngokungaqhelekanga kwaye umamele ukubethelwa kwempempe okungaqhelekanga
Kukho iimeko ezininzi kubunjineli bobunjineli, sinokungalwazi uhlobo olungundoqo oluchanekileyo, kunzima ukwazi ubungakanani be-inductance saturation yangoku, kwaye ngamanye amaxesha akulula ukuvavanya i-inductance yangoku;Ngeli xesha, sinokubona kwangaphambili ukuba ukugcwalisa kwenzekile ngokulinganisa ukuba i-inductance inokwenyuka kobushushu obungaqhelekanga, okanye ukumamela ukuba kukho isikhalo esingaqhelekanga.
Iingcebiso ezimbalwa zokumisela i-inductance saturation ziye zaziswa apha.Ndiyathemba ukuba ibe luncedo.
Ixesha lokuposa: Jul-07-2023