iindaba

Sisebenzisa iikuki ukuphucula amava akho.Ngokuqhubeka ukhangela le webhusayithi, uyavumelana nokusebenzisa kwethu ikuki.Ingcaciso eyongezelelekileyo.
I-inductors kwi-automotive DC-DC converter izicelo kufuneka zikhethwe ngononophelo ukuze kuphunyezwe indibaniselwano efanelekileyo yeendleko, umgangatho, kunye nokusebenza kombane. Kweli nqaku, Field Application Engineer Smail Haddadi inika isikhokelo malunga nokubala iinkcukacha ezifunekayo kwaye yintoni urhwebo- zingenziwa.
Kukho malunga ne-80 yezicelo ze-elektroniki ezahlukeneyo kwi-automotive electronics, kwaye isicelo ngasinye sifuna umzila waso ozinzileyo wamandla, ophuma kumbane webhetri.Oku kunokufezekiswa ngolawulo olukhulu, olulahlekileyo "lomgca", kodwa indlela esebenzayo kukusebenzisa. i-"buck" okanye "i-buck-boost" yokuguqula isilawuli, kuba oku kunokufezekisa ukusebenza kakuhle kunye nokusebenza kakuhle ngaphezu kwe-90%.Ukunyaniseka.Olu hlobo lwesilawuli sokutshintsha lufuna i-inductor.Ukukhetha icandelo elichanekileyo ngamanye amaxesha kunokubonakala kuyimfihlakalo, kuba izibalo ezifunekayo zivela kwi-19th century magnetic theory.Abayili bafuna ukubona i-equation apho banokuthi "bafake" iiparitha zabo zokusebenza kwaye bafumane "ichanekileyo" inductance kunye nemilinganiselo yangoku ukuba banokukhetha ngokulula kwikhathalogu yamacandelo.Nangona kunjalo, izinto azilulanga kangako: ezinye izinto ezicingelwayo kufuneka zenziwe, iinzuzo kunye nezibi kufuneka zilinganiswe, kwaye idla ngokufuna uphinda-phindo loyilo oluninzi.Nangona kunjalo, iindawo ezigqibeleleyo zisenokungafumaneki njengemigangatho. kwaye kufuneka ihlaziywe kwakhona ukubona ukuba i-inductors engaphandle kweshelufu ingena njani.
Makhe siqwalasele i-buck regulator (Figure 1), apho iVin i-voltage yebhetri, i-Vout i-voltage ye-voltage ye-process power rail ephantsi, kunye ne-SW1 kunye ne-SW2 zicinywa kwaye zicinywe ngokutshintshana. (Ton + Toff) apho iTon ixabiso xa i-SW1 ivaliwe kwaye iToff lixabiso xa ivuliwe.Akukho inductance kule nxaki, ngoko ke yenza ntoni?Ngemigaqo elula, i-inductor idinga ukugcina amandla aneleyo xa I-SW1 ivuliwe ukuyivumela ukuba igcine imveliso xa icinyiwe.Kuyenzeka ukubala amandla agciniweyo kwaye uthelekise amandla afunekayo, kodwa eneneni kukho ezinye izinto ekufuneka ziqwalaselwe kuqala.Ukutshintsha okutshintshisayo kwe-SW1 kunye ne-SW2 ibangela ukuba i-current inductor iphakame kwaye iwa, ngaloo ndlela yenza i-triangular "ripple current" kwixabiso eliphakathi kwe-DC. Emva koko, i-ripple current igeleza kwi-C1, kwaye xa i-SW1 ivaliwe, i-C1 iyayikhulula. I-capacitor ESR iya kuvelisa i-voltage ye-voltage ripple.Ukuba le yiparameter ebalulekileyo, kwaye i-capacitor kunye ne-ESR yayo igxininiswe ngobukhulu okanye ixabiso, oku kunokubeka i-ripple current kunye nexabiso le-inductance.
Ngokuqhelekileyo ukhetho lwe-capacitors lunikeza ukuguquguquka.Oku kuthetha ukuba ukuba i-ESR iphantsi, i-ripple current ingaba phezulu.Nangona kunjalo, oku kubangela iingxaki zayo.Ngokomzekelo, ukuba "intlambo" ye-ripple i-zero phantsi kwemithwalo ethile yokukhanya, kunye ne-SW2 yi-diode, phantsi kweemeko eziqhelekileyo, iya kuyeka ukuqhuba ngexesha lenxalenye yomjikelezo, kwaye umguquleli uya kungena kwimodi "yokuqhubekisa ukuqhubela phambili". isimo esizinzileyo.Iziguquli zebhaki zanamhlanje zihlala zisebenzisa ukulungiswa kwe-synchronous, apho i-SW2 i-MOSESFT kwaye inokuqhuba i-drain current kumacala omabini xa ilayitiwe.Oku kuthetha ukuba i-inductor inokujiyiza i-negative kwaye igcine ukuqhuba okuqhubekayo (Umfanekiso wesi-2).
Kule meko, i-peak-to-peak ripple yangoku ΔI inokuvunyelwa ukuba ibe phezulu, ebekwe ngexabiso le-inductance ngokutsho kwe-ΔI = ET / LE yi-voltage inductor esetyenziswa ngexesha le-T. Xa i-E ikhupha i-voltage , kulula ukuqwalasela okwenzekayo ngexesha lokucima i-Toff ye-SW1.ΔI yeyona inkulu ngeli nqanaba kuba i-Toff yeyona inkulu kumbane ophezulu wokufaka igalelo lomsebenzi wokudlulisa.Umzekelo: Kumthamo omkhulu webhetri we-18 V, imveliso ye-3.3 V, i-peak-to-peak ripple ye-1 A, kunye ne-frequency switching ye-500 kHz, L = 5.4 µH. Oku kuthatha ukuba akukho kwehla kwamandla ombane phakathi kwe-SW1 kunye ne-SW2.Umthwalo wangoku awukho. ibalwa kolu balo.
Uphendlo olufutshane lwekhathalogu lunokutyhila iinxalenye ezininzi ezinemilinganiselo yangoku ehambelana nomthwalo ofunekayo.Nangona kunjalo, kubalulekile ukukhumbula ukuba i-ripple current ibekwe phezulu kwixabiso le-DC, okuthetha ukuba kulo mzekelo ungasentla, i-inductor yangoku iya kuphakama ngokwenene. kwi-0.5 A ngaphezu komthwalo wangoku.Kukho iindlela ezahlukeneyo zokuvavanya i-current ye-inductor: njengomlinganiselo we-thermal saturation okanye umda we-magnetic saturation.I-inductors eqingqiweyo ye-Thermally ivame ukulinganiswa ngokunyuka kweqondo lokushisa, ngokuqhelekileyo i-40 oC, kwaye ingaba esebenza kwimisinga ephezulu ukuba inokupholiswa.I-Saturation kufuneka igwenywe kwiindawo eziphakamileyo, kwaye umda uya kuncipha kunye neqondo lokushisa.Kuyimfuneko ukuba uhlolisise ngokucophelela i-curve ye-data ye-inductance sheet ukujonga ukuba inqunyelwe ukushisa okanye ukugcwala.
Ilahleko ye-inductance nayo iyingqwalasela ebalulekileyo.Ilahleko ngokuyininzi ilahleko ye-ohmic, enokubalwa xa i-ripple current iphantsi.Kumanqanaba aphezulu e-ripple, ilahleko ezingundoqo ziqala ukulawula, kwaye ezi lahleko zixhomekeke kwimilo ye-waveform kunye Ubuninzi bexesha kunye nobushushu, ngoko ke kunzima ukuqikelela. Iimvavanyo ezizizo zenziwa kwiprototype, njengoko oku kunokubonisa ukuba i-ripple current esezantsi iyimfuneko kwiyona ndlela ilungileyo iyonke. inkqubo.
I-TT Electronics 'i-high-performance ye-HA66 uchungechunge luyisiqalo esihle (umzobo 3) .Uluhlu lwayo lubandakanya inxalenye ye-5.3 µH, i-saturation yangoku ye-2.5 A, i-2 A umthwalo ovunyelweyo, kunye ne-ripple ye-+/- 0.5 A. Ezi nxalenye zilungele izicelo zemoto kwaye zifumene isatifikethi se-AECQ-200 kwinkampani enenkqubo evunyiweyo ye-TS-16949.
Olu lwazi luthathwe kwizinto ezibonelelwa yiTT Electronics plc kwaye iye yaphononongwa yaza yahlengahlengiswa.
TT Electronics Co., Ltd. (2019, Okthobha 29).Iinductors zamandla kwi-automotive DC-DC applications.AZoM.Retrieved from https://www.azom.com/article.aspx?ArticleID=17140 nge-27 December 2021.
I-TT Electronics Co., Ltd. “Iinductors zamandla kwi-automotive DC-DC applications”.AZoM.Disemba 27, 2021..
I-TT Electronics Co., Ltd. “Ii-inductors zamandla kwi-automotive DC-DC applications”.AZoM.https://www.azom.com/article.aspx?ArticleID=17140.(Ifikeleleke nge-27 kaDisemba 2021).
I-TT Electronics Co., Ltd. 2019. Iinductors zombane kwi-automotive DC-DC applications.AZoM, ijongwe nge-27 kaDisemba 2021, https://www.azom.com/article.aspx?ArticleID=17140.
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