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Muna amfani da kukis don haɓaka ƙwarewar ku.Ta ci gaba da bincika wannan gidan yanar gizon, kun yarda da amfani da kukis.Ƙarin bayani.
Inductors a cikin aikace-aikacen musanya na DC-DC na motoci suna buƙatar a zaɓa su a hankali don cimma daidaitaccen haɗin farashi, inganci, da aikin lantarki. za a iya yin kashe-kashe.
Akwai kusan aikace-aikacen lantarki daban-daban guda 80 a cikin na'urorin lantarki na motoci, kuma kowane aikace-aikacen yana buƙatar nasa tsayayyen tashar wutar lantarki, wanda aka samo shi daga ƙarfin baturi. Ana iya samun wannan ta babban mai sarrafa “mai layi” mai hasara, amma hanya mai inganci ita ce amfani da ita. mai "buck" ko "buck-boost" mai sauyawa mai daidaitawa, saboda wannan zai iya cimma inganci da inganci fiye da 90%.Karamin ƙarfi.Wannan nau'in mai sarrafa sauyawa yana buƙatar inductor.Zaɓin madaidaicin sashi na iya zama wani lokaci ya zama abin ban mamaki, saboda lissafin da ake buƙata ya samo asali ne a cikin ka'idar Magnetic karni na 19. Masu zane-zane suna so su ga ma'auni inda za su iya "toshe" sigogin aikin su kuma su sami "daidai" inductance da ƙimar halin yanzu don haka. Duk da haka, abubuwa ba su da sauƙi: dole ne a yi wasu zato, ribobi da fursunoni dole ne a auna, kuma yawanci yana buƙatar ƙirar ƙira da yawa. kuma ana buƙatar sake fasalin su don ganin yadda inductor ɗin da ba a kwance ba suka dace.
Bari mu yi la'akari da mai sarrafa buck (Hoto 1), inda Vin shine ƙarfin baturi, Vout shine ƙananan ƙarfin wutar lantarki, kuma SW1 da SW2 suna kunnawa da kashewa a madadin. (Ton + Toff) inda Ton shine darajar lokacin da aka rufe SW1 kuma Toff shine darajar lokacin da yake buɗewa. Babu inductance a cikin wannan lissafin, don haka menene yake yi? A cikin sauƙi, inductor yana buƙatar adana isasshen makamashi lokacin da Ana kunna SW1 don ba shi damar kiyaye fitarwa lokacin da aka kashe shi.Yana yiwuwa a lissafta makamashin da aka adana kuma a daidaita shi da makamashin da ake buƙata, amma a zahiri akwai wasu abubuwan da ya kamata a fara la'akari da su. Canjin canji na SW1 da SW2 yana haifar da halin yanzu a cikin inductor ya tashi da faɗuwa, ta haka ne ya samar da triangular "ripple current" a kan matsakaicin darajar DC. Sa'an nan kuma, ripple halin yanzu yana gudana zuwa C1, kuma lokacin da SW1 ya rufe, C1 ya sake shi. Yanzu ta hanyar capacitor ESR zai samar da fitarwa irin ƙarfin lantarki ripple.Idan wannan shi ne m siga, da capacitor da ESR da aka gyara ta size ko farashi, wannan na iya saita ripple halin yanzu da inductance darajar.
Yawancin lokaci zaɓi na capacitors yana ba da sassauci. Wannan yana nufin cewa idan ESR ya yi ƙasa, raƙuman ruwa na iya zama babba. Duk da haka, wannan yana haifar da matsalolin kansa. Alal misali, idan "kwari" na ripple ba shi da sifili a ƙarƙashin wasu nauyin haske. kuma SW2 diode ne, a karkashin yanayi na al'ada, zai dakatar da gudanarwa a lokacin wani ɓangare na sake zagayowar, kuma mai canzawa zai shiga yanayin "katsewa" yanayin. steady state.Modern Buck converters yawanci amfani da synchronous gyarawa, inda SW2 ne MOSEFT kuma zai iya gudanar da lambatu halin yanzu a cikin biyu kwatance lokacin da aka kunna.Wannan yana nufin cewa inductor iya lilo korau da kuma kula da ci gaba conduction (Hoto 2).
A wannan yanayin, ana iya ƙyale ΔI mafi girma-zuwa ganiya ya zama mafi girma, wanda aka saita ta ƙimar inductance bisa ga ΔI = ET / LE shine ƙarfin inductor da aka yi amfani da shi a lokacin lokacin T. Lokacin da E shine ƙarfin fitarwa. , Yana da mafi sauƙi don la'akari da abin da ke faruwa a lokacin kashewa Toff na SW1.ΔI shine mafi girma a wannan lokaci saboda Toff shine mafi girma a mafi girman ƙarfin shigarwa na aikin canja wuri. Misali: Don matsakaicin ƙarfin baturi na 18 V, fitarwa na 3.3 V, mafi girma-zuwa-ƙalo na 1 A, da kuma sauyawar mita 500 kHz, L = 5.4 µH. Wannan yana ɗauka cewa babu raguwar wutar lantarki tsakanin SW1 da SW2. The load current ba lissafta a cikin wannan lissafin.
Wani ɗan gajeren bincike na kasida zai iya bayyana sassa da yawa waɗanda ƙimar halin yanzu ta dace da nauyin da ake buƙata. Duk da haka, yana da mahimmanci a tuna cewa ripple halin yanzu yana kan darajar DC, wanda ke nufin cewa a cikin misalin da ke sama, inductor na yanzu zai haƙiƙa kololuwa. a 0.5 A sama da nauyin nauyi na yanzu. Akwai hanyoyi daban-daban don kimanta halin yanzu na inductor: a matsayin ma'auni na thermal jikewa ko iyakacin magnetic jikewa. ana sarrafa su a mafi girma igiyoyi idan za a iya sanyaya su. Dole ne a kauce wa jikewa a mafi girman igiyoyin, kuma iyaka zai ragu tare da zafin jiki. Wajibi ne a hankali duba madaidaicin takardar bayanan inductance don duba ko yana iyakance ta zafi ko jikewa.
Har ila yau, asarar inductance yana da mahimmancin la'akari. Asarar ita ce mafi yawan asarar ohmic, wanda za'a iya ƙididdige shi lokacin da ripple halin yanzu yana da ƙasa. mita da zafin jiki, don haka yana da wuya a iya hangowa. Gwaje-gwaje na ainihi da aka yi a kan samfurin, saboda wannan na iya nuna cewa ƙananan ripple halin yanzu yana da mahimmanci don mafi kyawun inganci. tsari.
TT Electronics' high-performance HA66 jerin ne mai kyau wurin farawa (Hoto 3) .Ya kewayon hada da 5.3 µH part, wani rated jikewa halin yanzu na 2.5 A, a 2 A load yarda, da kuma ripple na +/- 0.5 A. Waɗannan sassan suna da kyau don aikace-aikacen kera motoci kuma sun sami takardar shedar AECQ-200 daga kamfani tare da ingantaccen tsarin inganci na TS-16949.
An samo wannan bayanin daga kayan aikin TT Electronics plc kuma an sake dubawa kuma an daidaita su.
TT Electronics Co., Ltd. (2019, Oktoba 29) .Power inductors for automotive DC-DC applications.AZoM.An dawo daga https://www.azom.com/article.aspx?ArticleID=17140 akan Disamba 27, 2021.
TT Electronics Co., Ltd. "Inductor Power for Automotive DC-DC aikace-aikace"AZoM.December 27, 2021.
TT Electronics Co., Ltd. "Inductor Power for Automotive DC-DC aikace-aikace"AZoM.https://www.azom.com/article.aspx?ArticleID=17140.(An shiga ranar 27 ga Disamba, 2021).
TT Electronics Co., Ltd. 2019. Inductor wutar lantarki don aikace-aikacen DC-DC na kera.AZoM, wanda aka duba ranar 27 ga Disamba, 2021, https://www.azom.com/article.aspx?ArticleID=17140.
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