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Re sebelisa li-cookies ho ntlafatsa boiphihlelo ba hau.Ka ho tsoela pele ho bala sebaka sena sa Marang-rang, u lumellana le tšebeliso ea rona ea li-cookies.Boitsebiso bo bong.
Li-inductors tsa li-converter tsa DC-DC tsa likoloi li hloka ho khethoa ka hloko ho finyella motsoako o nepahetseng oa litšenyehelo, boleng, le ts'ebetso ea motlakase. li-offs li ka etsoa.
Ho na le mefuta e ka bang 80 ea lisebelisoa tsa elektronike tse fapaneng tsa elektronike tsa likoloi, 'me kopo e' ngoe le e 'ngoe e hloka seporo sa eona se tsitsitseng sa matla, se tsoang ho matla a betri. "Buck" kapa "buck-boost" switching regulator, hobane sena se ka finyella katleho le katleho e fetang 90%.Compactness.Mofuta ona wa switjha regulator hloka inductor.Ho khetha karolo e nepahetseng ka linako tse ling ho ka bonahala e le ntho e makatsang, hobane lipalo tse hlokahalang li simolohile lekholong la bo19 la lilemo. hore ba ka khetha feela ho tsoa lethathamong la likarolo.Leha ho le joalo, lintho ha li bonolo hakalo: menahano e meng e tlameha ho etsoa, ​​melemo le bofokoli e tlameha ho lekanngoa, 'me hangata e hloka ho pheta-pheta ka makhetlo a mangata.Le ha ho le joalo, likarolo tse phethahetseng li kanna tsa se fumanehe joalo ka litekanyetso. 'me e hloka ho hlophisoa bocha ho bona hore na li-inductors tse kantle ho sethala li lekana joang.
A re ke re nahaneng ka buck regulator (Figure 1), moo Vin e leng matla a betri, Vout ke seporo sa motlakase se tlaase sa motlakase, 'me SW1 le SW2 li khannoa le ho tima ka tsela e fapaneng.Mosebetsi o bonolo oa phetisetso equation ke Vout = Vin.Ton/ (Ton + Toff) moo Ton e leng boleng ha SW1 e koetsoe 'me Toff ke boleng ha e butsoe.Ha ho na inductance ho equation ena, joale e etsa'ng?Ka mantsoe a bonolo, inductor e hloka ho boloka matla a lekaneng ha SW1 e buletsoe ho e lumella ho boloka tlhahiso ha e tingoa.Hoa khonahala ho bala matla a bolokiloeng le ho a lekana le matla a hlokahalang, empa ha e le hantle ho na le lintho tse ling tse lokelang ho nahanoa pele.The alternating switching of SW1 'me SW2 e etsa hore hona joale ho inductor e tsohe le ho oa, kahoo e etsa "ripple current" e khutlo-tharo ka tekanyo ea DC e tloaelehileng. Joale, maqhubu a phallang a phalla ho C1, 'me ha SW1 e koetsoe, C1 e e lokolla. capacitor ESR e tla hlahisa tlhahiso ea voltage ripple.Haeba sena e le parameter ea bohlokoa, 'me capacitor le ESR ea eona li tsitsitse ka boholo kapa litšenyehelo, sena se ka beha boleng ba hona joale le inductance.
Hangata khetho ea li-capacitor e fana ka ho feto-fetoha ha maemo.Sena se bolela hore haeba ESR e le tlaase, hona joale ho ka 'na ha e-ba le matla a mangata. 'me SW2 ke diode, tlas'a maemo a tloaelehileng, e tla khaotsa ho tsamaisa nakong ea karolo ea potoloho,' me converter e tla kena ka mokhoa oa "discontinuous conduction".Mokhoeng ona, mosebetsi oa ho fetisa o tla fetoha 'me ho ba thata ho finyella se molemo ka ho fetisisa. boemo bo tsitsitseng.Li-converter tsa kajeno tsa buck hangata li sebelisa synchronous rectification, moo SW2 e leng MOSEFT mme e ka tsamaisa drainage ea hona joale ka mahlakoreng ka bobeli ha e buletsoe.Sena se bolela hore inductor e khona ho sotha negative le ho boloka conduction e tsoelang pele (Figure 2).
Tabeng ena, peak-to-peak ripple current ΔI e ka lumelloa hore e be e phahameng, e behiloeng ke boleng ba inductance ho latela ΔI = ET/LE ke motlakase oa motlakase o sebelisoang nakong ea T. Ha E le motlakase oa tlhahiso. , ho bonolo ka ho fetisisa ho nahana ka se etsahalang ka nako ea ho tima Toff ea SW1.ΔI ke eona e kholo ka ho fetisisa ntlheng ena hobane Toff ke eona e kholo ka ho fetisisa ka matla a phahameng ka ho fetisisa a kenyeletso ea tšebetso ea phetiso.Mohlala: Bakeng sa matla a phahameng a betri a 18 V, tlhahiso ea 3.3 V, tlhōrō ea tlhōrō ea 1 A, le maqhubu a ho fetoha a 500 kHz, L = 5.4 µH. Sena se nka hore ha ho na ho theoha ha motlakase pakeng tsa SW1 le SW2. Hona joale mojaro ha o joalo. e baloang palong ena.
Patlisiso e khutšoane ea lethathamong lena e ka senola likarolo tse ngata tseo litekanyetso tsa tsona tsa hajoale li lumellanang le mojaro o hlokahalang. Leha ho le joalo, ke habohlokoa ho hopola hore maqhubu a ripple a phahame ka holimo ho boleng ba DC, ho bolelang hore mohlaleng o ka holimo, motlakase oa inductor o tla fihla tlhōrōng. ho 0.5 A ka holim'a mojaro oa hona joale.Ho na le mekhoa e fapaneng ea ho lekola boemo ba hona joale ba inductor: joalo ka moeli oa ho tlala mocheso kapa moeli oa ho tlala matla a khoheli.Li-inductors tse lekantsoeng ka mocheso hangata li lekanyetsoa bakeng sa ho phahama ha mocheso, hangata ho 40 oC, 'me ho ka ba joalo. sebetsa ka maqhubu a phahameng haeba li ka pholile.Saturation e lokela ho qojoa ka maqhubu a tlhōrō, 'me moeli o tla fokotseha ka mocheso.Hoa hlokahala ho hlahloba ka hloko curve ea lakane ea inductance ho hlahloba hore na e lekanyelitsoe ke mocheso kapa saturation.
Tahlehelo ea inductance e boetse ke ea bohlokoa ho nahanela.Tahlehelo ke haholo-holo tahlehelo ea ohmic, e ka baloang ha maqhubu a ripple a le tlaase. khafetsa le mocheso, kahoo ho thata ho bolela esale pele.Liteko tsa 'nete tse entsoeng ho prototype, kaha sena se ka bonts'a hore hona joale ho hlokahala hore ho be le ts'ebetso e ntle ka ho fetisisa. tshebetso.
Letoto la HA66 le phahameng la ts'ebetso ea TT Electronics ke sebaka se setle sa ho qala (Setšoantšo sa 3) .Lethathamo la eona le kenyelletsa karolo ea 5.3 µH, e lekantsoeng ea saturation ea hona joale ea 2.5 A, mojaro oa 2 A o lumelloa, le ripple ea +/- 0.5 A. Likarolo tsena li loketse likopo tsa likoloi 'me li fumane lengolo la AECQ-200 ho tsoa k'hamphaning e nang le sistimi ea boleng e amohetsoeng ea TS-16949.
Tlhahisoleseding ena e nkiloe ho thepa e fanoeng ke TT Electronics plc 'me e hlahlobiloe le ho fetoloa.
TT Electronics Co., Ltd. (2019, October 29).Li-inductors tsa likoloi tsa DC-DC applications.AZoM.Retrieved from https://www.azom.com/article.aspx?ArticleID=17140 ka December 27, 2021.
TT Electronics Co., Ltd. "Power inductors for automotive DC-DC applications".AZoM.December 27, 2021..
TT Electronics Co., Ltd. "Power inductors for automotive DC-DC applications"
TT Electronics Co., Ltd. 2019. Li-inductors tsa motlakase bakeng sa lits'ebetso tsa likoloi tsa DC-DC.AZoM, li shebiloe ka la 27 Tšitoe 2021, https://www.azom.com/article.aspx?ArticleID=17140.
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