izindaba

Sisebenzisa amakhukhi ukuthuthukisa ulwazi lwakho.Ngokuqhubeka upheqa le webhusayithi, uyavumelana nokusebenzisa kwethu amakhukhi.Ulwazi olwengeziwe.
Ama-inductors ezinhlelweni zokuguqula izimoto ze-DC-DC adinga ukukhethwa ngokucophelela ukuze azuze inhlanganisela efanele yezindleko, ikhwalithi, nokusebenza kukagesi. Kulesi sihloko, Unjiniyela Wesicelo Sensimu u-Smail Haddadi unikeza isiqondiso sendlela yokubala imininingwane edingekayo kanye nalokho okuthengiswayo- ama-offs angenziwa.
Kunezinhlelo zokusebenza ze-elekthronikhi ezihlukene ezingaba ngu-80 ku-elekthronikhi yezimoto, futhi isicelo ngasinye sidinga isitimela saso esizinzile samandla, esisuselwe ku-voltage yebhethri.Lokhu kungafezwa ngesilawuli "esiqondile" esikhulu, esilahlekile, kodwa indlela ephumelelayo ukusebenzisa. isilawuli sokushintsha "imali" noma "i-buck-boost", ngoba lokhu kungafeza ukusebenza kahle nokusebenza kahle okungaphezu kwama-90%.Ukuqina.Lolu hlobo lwesilawuli sokushintsha ludinga i-inductor.Ukukhetha ingxenye efanele ngezinye izikhathi kungase kubonakale kungaqondakali, ngoba izibalo ezidingekayo zavela ku-19th century magnetic theory.Abaklami bafuna ukubona i-equation lapho 'bangaxhuma khona' amapharamitha wabo wokusebenza futhi bathole "okulungile" inductance kanye nezilinganiso zamanje ukuthi bangamane bakhethe kukhathalogi yezingxenye.Nokho, izinto azilula kangako: kufanele kwenziwe ezinye izinto ezicatshangelwayo, okuhle nokubi kufanele kukalwe, futhi ngokuvamile kudinga ukuphindaphindwa kwemiklamo eminingi.Noma kunjalo, izingxenye eziphelele zingase zingatholakali njengezindinganiso. futhi idinga ukuklanywa kabusha ukuze ubone ukuthi ama-inductors angekho eshalofini angena kanjani.
Ake sicabangele isilawuli sembabala (Umfanekiso 1), lapho i-Vin iyi-voltage yebhethri, i-Vout iyisitimela samandla esicubungula i-voltage ephansi, futhi i-SW1 ne-SW2 ziyavulwa futhi zivaliwe ngokushintshana. (I-Ton + Toff) lapho i-Ton iyinani lapho i-SW1 ivaliwe futhi i-Toff iyinani uma ivuliwe.Akukho inductance kule zibalo, ngakho yenzani?Ngamagama alula, i-inductor idinga ukugcina amandla anele uma I-SW1 ivuliwe ukuyivumela ukuthi igcine okukhiphayo uma icishiwe.Kuyenzeka ukubala amandla agciniwe bese uwafanisa namandla adingekayo, kodwa empeleni kukhona ezinye izinto ezidinga ukucatshangelwa kuqala.Ukushintshwa okushintshanayo kwe-SW1 kanye ne-SW2 ibangela ukuthi i-current in inductor ikhuphuke futhi yehle, ngaleyo ndlela yenze unxantathu "i-ripple current" enanini elijwayelekile le-DC. Bese, i-ripple current igelezela ku-C1, futhi uma i-SW1 ivaliwe, i-C1 iyayikhulula. I-capacitor ESR izokhiqiza i-ripple voltage okukhiphayo.Uma lokhu kuyipharamitha ebalulekile, futhi i-capacitor ne-ESR yayo ilungiswa ngosayizi noma izindleko, lokhu kungase kusethe inani lamanje le-ripple kanye ne-inductance.
Ngokuvamile ukukhethwa kwama-capacitor kunikeza ukuguquguquka.Lokhu kusho ukuthi uma i-ESR iphansi, i-ripple current ingaba phezulu.Nokho, lokhu kubangela izinkinga zayo.Ngokwesibonelo, uma "isigodi" se-ripple singu-zero ngaphansi kwemithwalo ethile yokukhanya, futhi i-SW2 i-diode, ngaphansi kwezimo ezijwayelekile, izoyeka ukuqhuba phakathi nengxenye yomjikelezo, futhi isiguquli sizofaka imodi "yokuqhutshwa kokuyeka".Kule modi, umsebenzi wokudlulisa uzoshintsha futhi kuba nzima nakakhulu ukufeza okungcono kakhulu. isimo esiqinile.Iziguquli zembabala zanamuhla ngokuvamile zisebenzisa ukulungiswa okufanayo, lapho i-SW2 iyi-MOSEFT futhi ingakwazi ukukhipha amandla kuzo zombili izikhombisi-ndlela lapho ivuliwe.Lokhu kusho ukuthi i-inductor ingashwibeka inegethivu futhi igcine ukuqhutshwa okuqhubekayo (Umfanekiso 2).
Kulokhu, i-peak-to-peak ripple current ΔI ingavunyelwa ukuba ibe phezulu, esethwa inani le-inductance ngokusho kwe-ΔI = ET/LE i-voltage ye-inductor esetshenziswa ngesikhathi sika-T. Lapho u-E kuyi-voltage ephumayo , kulula kakhulu ukucabangela ukuthi kwenzekani ngesikhathi sokucisha i-Toff ye-SW1.ΔI inkulu kunawo wonke kuleli qophelo ngoba i-Toff inkulu ku-voltage yokufakwayo ephezulu kakhulu yomsebenzi wokudlulisa.Isibonelo: Ukuze uthole amandla omthamo omkhulu webhethri angu-18 V, okukhiphayo okungu-3.3 V, i-ripple yokuya phezulu ukuya phezulu engu-1 A, kanye nemvamisa yokushintsha engu-500 kHz, L = 5.4 µH. Lokhu kuthatha ukuthi akukho ukwehla kwamandla kagesi phakathi kwe-SW1 ne-SW2. I-current load ayikho kubalwe kulesi sibalo.
Ukusesha okufushane kwekhathalogi kungase kwembule izingxenye eziningi izilinganiso zazo zamanje ezihambisana nomthwalo odingekayo. Nokho, kubalulekile ukukhumbula ukuthi i-ripple current ibekwe ngaphezu kwevelu ye-DC, okusho ukuthi kulesi sibonelo esingenhla, i-inductor yamanje izoba phezulu ngempela. ku-0.5 A ngaphezu komthwalo wamanje.Kunezindlela ezihlukene zokuhlola ukusebenza kwamanje kwe-inductor: njengomkhawulo wokugcwala okushisayo noma umkhawulo wokugcwala kozibuthe.Ama-inductors anomkhawulo we-thermal ngokuvamile alinganiselwe ngokunyuka kwezinga lokushisa okunikeziwe, ngokuvamile okungu-40 oC, futhi kungaba esebenza kumaza aphezulu uma ekwazi ukupholiswa.Ukugcwalisa kufanele kugwenywe lapho izinga lokushisa liphezulu kakhulu, futhi umkhawulo uzokwehla ngezinga lokushisa.Kuyadingeka ukuhlola ngokucophelela ijika leshidi ledatha ye-inductance ukuze uhlole ukuthi likhawulelwe yini ukushisa noma ukugcwala kwendawo.
Ukulahlekelwa kwe-inductance nakho kuwukucatshangelwa okubalulekile.Ukulahlekelwa ngokuyinhloko ukulahlekelwa kwe-ohmic, okungabalwa lapho i-ripple current iphansi.Emazingeni aphezulu e-ripple, ukulahlekelwa okuyinhloko kuqala ukubusa, futhi lokhu kulahlekelwa kuncike ekumeni kwe-waveform kanye imvamisa nezinga lokushisa, ngakho-ke kunzima ukubikezela.Ukuhlolwa kwangempela okwenziwe ku-prototype, njengoba lokhu kungase kubonise ukuthi i-ripple current ephansi iyadingeka ukuze kusebenze kahle kakhulu. inqubo.
Uchungechunge lwe-HA66 olusebenza kahle kakhulu lwe-TT Electronics luyiphoyinti elihle lokuqala (Umfanekiso 3). Ububanzi balo buhlanganisa ingxenye engu-5.3 µH, isilinganiso samanje sokugcwaliswa kwesikhala esingu-2.5 A, umthwalo ongu-2 A ovunyelwe, kanye ne-ripple engu-+/- 0.5 A. Lezi zingxenye zilungele izicelo zezimoto futhi zithole isitifiketi se-AECQ-200 enkampanini enohlelo olugunyaziwe lwekhwalithi ye-TS-16949.
Lolu lwazi luthathwe ezintweni ezihlinzekwa yi-TT Electronics plc futhi selibuyekeziwe futhi lashintshwa.
I-TT Electronics Co., Ltd. (2019, Okthoba 29).Ama-inductors amandla ezinhlelo zokusebenza zezimoto ze-DC-DC.AZoM.Itholwe kusukela ku-https://www.azom.com/article.aspx?ArticleID=17140 ngo-December 27, 2021.
I-TT Electronics Co., Ltd. “Ama-inductors amandla ezinhlelo zokusebenza zezimoto ze-DC-DC”.AZoM.Disemba 27, 2021..
I-TT Electronics Co., Ltd. “Ama-inductors kagesi ezinhlelo zokusebenza zezimoto ze-DC-DC”.AZoM.https://www.azom.com/article.aspx?ArticleID=17140.(Ifinyelelwe ngoDisemba 27, 2021).
I-TT Electronics Co., Ltd. 2019. Ama-inductors kagesi ezinhlelo zokusebenza zezimoto ze-DC-DC.AZoM, abukwe ngomhla ka-27 Disemba 2021, https://www.azom.com/article.aspx?ArticleID=17140.
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