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Isu tinoshandisa makuki kuwedzera ruzivo rwako.Nekuramba uchitsvaga webhusaiti ino, unobvuma kushandisa kwedu makuki.Rumwe ruzivo.
Iwo ma inductors mumotokari DC-DC converter application inofanirwa kunyatsosarudzwa kuti iwane musanganiswa wakakodzera wemutengo, mhando, uye kushanda kwemagetsi. maoffs anogona kuitwa.
Kune anenge makumi masere emhando dzakasiyana dzemagetsi emagetsi emagetsi emotokari, uye imwe neimwe yekushandisa inoda njanji yayo yakagadzikana yemagetsi, iyo inotorwa kubva kubhatiri voltage.Izvi zvinogona kuwanikwa nehombe, kurasikirwa "linear" regulator, asi nzira inoshanda ndeyekushandisa. a "buck" kana "buck-boost" switching regulator, nokuti izvi zvinogona kubudirira kubudirira uye kubudirira kweanopfuura 90%.Compactness.Iyi mhando yekushandura regulator inoda inductor.Kusarudza chikamu chakarurama dzimwe nguva kungaita sechinhu chisinganzwisisike, nokuti maverengero anodiwa akatanga muzana remakore rechi19 magnetic theory.Vagadziri vanoda kuona equation apo vanogona "kuvhara" maitiro avo ekuita uye kuwana "chaiyo" inductance uye ratings ikozvino. kuti vanogona kungosarudza kubva kune zvikamu zvekabhuku.Zvisinei, zvinhu hazvisi nyore kudaro: zvimwe zvinongofungidzirwa zvinofanira kuitwa, zvakanakira nezvazvakaipira zvinofanira kuyerwa, uye zvinowanzoda kudzokororwa kwemaitiro akawanda.Kunyange zvakadaro, zvikamu zvakakwana zvingasawanikwa sezviyero. uye inoda kuvandudzwa kuti uone kuti off-the-sherufu inductors inokwana sei.
Ngationei bhegi regulator (Figure 1), apo Vin ndiyo bhatiri voltage, Vout ndiyo yakaderera voltage processor simba njanji, uye SW1 uye SW2 vari switched on uye kure alternately.The nyore kutamisa basa equation ndiko Vout = Vin.Ton/ (Ton + Toff) apo Ton ndiyo yakakosha kana SW1 yakavharwa uye Toff ndiyo yakakosha kana yakavhurika.Hapana inductance mune iyi equation, saka inoitei?Nemashoko akareruka, inductor inoda kuchengetedza simba rakakwana kana SW1 inobatidzwa kuti ikwanise kuchengetedza kubuda kana yakadzimwa.Zvinogoneka kuverenga simba rakachengetwa uye kurienzanisa nesimba rinodiwa, asi pane zvimwe zvinhu zvinoda kutanga zvatariswa.The alternating switching of SW1 uye SW2 inokonzera ikozvino muinductor kusimuka uye kudonha, zvichiita kuti iite katatu "ripple current" paavhareji DC kukosha.Zvino, ripple ikozvino inoyerera ichipinda muC1, uye kana SW1 yakavharwa, C1 inoibudisa. Ikozvino kuburikidza ne capacitor ESR ichabudisa goho voltage ripple.Kana ichi chiri parameter yakakosha, uye capacitor uye ESR yayo inogadziriswa nehukuru kana mari, izvi zvinogona kuisa ripple current uye inductance value.
Kazhinji kusarudzwa kwema capacitors kunopa kushanduka.Izvi zvinoreva kuti kana ESR yakaderera, ripple ikozvino inogona kunge yakakwirira.Zvisinei, izvi zvinokonzera matambudziko aro.Somuenzaniso, kana "mupata" weripple uri zero pasi pemimwe mitoro yakajeka, uye SW2 idhidhiyo, mumamiriro ezvinhu akajairika, icharega kuitisa panguva yechikamu chekutenderera, uye mushanduri achapinda mu "discontinuous conduction" mode.Mune iyi mode, basa rekushandura richachinja uye rinowedzera kuoma kuwana zvakanakisisa. steady state.Modern buck converters vanowanzo shandisa synchronous rectification, apo SW2 iri MOSEFT uye inogona kuitisa drain current mumativi ose painobatidzwa.Izvi zvinoreva kuti inductor inogona kuzungunutsa zvisina kunaka uye kuchengetedza kuenderera mberi (Figure 2).
Muchiitiko ichi, peak-to-peak ripple current ΔI inogona kubvumirwa kuva yakakwirira, iyo inotarirwa neinductance value maererano ΔI = ET / LE ndiyo inductor voltage inoshandiswa panguva T. Apo E ndiyo inobuda magetsi. , zviri nyore kufunga zvinoitika panguva yekudzima Toff yeSW1.ΔI ndiyo yakakura pane ino nguva nekuti Toff ndiyo hombe pamhepo yakakwira yekupinza yebasa rekutamisa.Semuyenzaniso: Pabhatiri repamusoro re18 V, kubuda kwe 3.3 V, peak-to-peak ripple ye 1 A, uye nguva yekushandura ye500 kHz, L = 5.4 µH. Izvi zvinotora kuti hapana kudonha kwemagetsi pakati peSW1 neSW2. Mutoro wezvino hausi yakaverengerwa mukuverenga uku.
Kutsvaga kwenguva pfupi kwekabhuku kunogona kuratidza zvikamu zvakawanda izvo zviyero zvemazuva ano zvinoenderana nemutoro unodiwa.Zvisinei, zvakakosha kuyeuka kuti ripple current yakanyanyisa pane DC kukosha, izvo zvinoreva kuti mumuenzaniso uri pamusoro apa, inductor current ichanyanya kukwira. pa 0.5 A pamusoro pemutoro wezvino.Kune nzira dzakasiyana dzekuongorora ikozvino kweinductor: semuganhu wekupisa kwekushisa kana kuti magnetic saturation limit.Thermally limited inductors inowanzoonekwa kune imwe nzvimbo yekushisa, kazhinji 40 oC, uye inogona kuva. inoshandiswa pamhepo yakakwirira kana ichigona kutonhodzwa.Kuzara kunofanira kudziviswa pamhepo yepamusoro, uye muganhu uchaderera nekupisa.Zvakakosha kunyatsotarisa inductance data sheet curve kuti uone kana inogumira nekupisa kana kuzara.
Inductance kurasikirwa kunokoshawo kufunga.Kurasikirwa kunonyanya kurasikirwa ohmic, iyo inogona kuverengwa kana ripple ikozvino yakaderera.Pakukwira kwepamusoro, kurasikirwa kwepakati kunotanga kutonga, uye kurasikirwa uku kunoenderana nechimiro chewaveform pamwe chete. frequency uye tembiricha, saka zvakaoma kufanotaura.Miedzo chaiyo yakaitwa pane prototype, sezvo izvi zvingaratidza kuti yakaderera ripple ikozvino inodiwa kuti iite zvakanakisa.Izvi zvinoda kuwedzera inductance, uye pamwe yakakwirira DC kuramba-ichi iterative. process.
TT Electronics 'high-performance HA66 series inzvimbo yakanaka yekutanga (Mufananidzo 3) .Urongwa hwayo hunosanganisira chikamu che 5.3 µH, chiyero chekugadzirisa ikozvino kwe2.5 A, 2 A mutoro unobvumirwa, uye ripple ye +/- 0.5 A. Izvi zvikamu zvakanakira kunyorera mota uye vakawana AECQ-200 certification kubva kukambani ine TS-16949 yakatenderwa mhando system.
Ruzivo urwu rwunobva muzvinhu zvakapihwa neTT Electronics plc uye yakaongororwa uye yakagadziridzwa.
TT Electronics Co., Ltd. (2019, Gumiguru 29).Mainductor emagetsi emotokari DC-DC applications.AZoM.Retrieved from https://www.azom.com/article.aspx?ArticleID=17140 musi wa27 Zvita 2021.
TT Electronics Co., Ltd. “Masimba inductors emotokari DC-DC applications”.AZoM.Zvita 27, 2021..
TT Electronics Co., Ltd. “Masimba inductors emotokari DC-DC applications”.AZoM.https://www.azom.com/article.aspx?ArticleID=17140.(Yakasvika musi wa27 Zvita 2021).
TT Electronics Co., Ltd. 2019. Magetsi emagetsi emotokari DC-DC applications.AZoM, yakaonekwa musi wa27 Zvita 2021, https://www.azom.com/article.aspx?ArticleID=17140.
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