Uhlalutyo lwe-inductor yangoku | PHILA

Uyilo lwe- inductor luzisa imingeni emininzi kwiinjineli kuyilo lokutshintsha unikezelo lwamandla. Iinjineli akufanele zikhethe kuphela ixabiso le-inductance, kodwa ziphinde ziqwalasele okwangoku ukuba i-inductor inokuthwala, ukuchasana nokuphefumula, ubungakanani bomatshini kunye nokunye. Impembelelo yangoku ye-DC kwi-inductor, eya kubonelela ngolwazi oluyimfuneko ekukhetheni i-inductor efanelekileyo.

Qonda umsebenzi we-inductor

I-inductor idla ngokuqondwa njenge-L kwisekethe yokucoca i-LC kwimveliso yombane wokutshintsha (C yi-capacitor ephumayo). Nangona oku kuqonda kuchanekile, kuyimfuneko ukuba ube nokuqonda okunzulu kokuziphatha kwee-inductors ukuze uqonde ukuyila kwee-inductors.

Kwi-conversion ye-step-down, enye isiphelo se-inductor ixhunywe kwi-voltage ye-DC yokuphuma. Esinye isiphelo siqhagamshelwe kwi-voltage yegalelo okanye i-GND ngokutshintsha i-frequency switching.

I-inductor ixhunyiwe kwi-voltage yegalelo ngokusebenzisa i-MOSFET, kwaye i-inductor ixhunyiwe kwi-GND. Ngenxa yokusetyenziswa kolu hlobo lomlawuli, i-inductor inokusekwa ngeendlela ezimbini: nge-diode grounding okanye nge-MOSFET. Ukuba yindlela yokugqibela, umguquleli ubizwa ngokuba yi "synchronus" mode.

Ngoku khawucinge kwakhona ukuba i-current flowing through inductor kula mazwe mabini iyatshintsha. Esinye isiphelo se-inductor siqhagamshelwe kwi-voltage yegalelo kwaye esinye isiphelo sixhunyiwe kwi-voltage ephumayo. Kwi-converter-down converter, i-voltage yegalelo kufuneka ibe phezulu kune-voltage ephumayo, ngoko ke ukuhla kwe-voltage efanelekileyo kuya kwenziwa kwi-inductor. Ngokuchasene noko, ngexesha le-2 yelizwe, isiphelo esinye se-inductor ekuqaleni siqhagamshelwe kwi-voltage yegalelo ixhunyiwe emhlabeni. Kwi-converter-down converter, i-voltage ephumayo kufuneka ibe yinto enhle, ngoko ke ukuhla kwe-voltage engalunganga kuya kwenziwa kwi-inductor.

Ngoko ke, xa i-voltage kwi-inductor ilungile, okwangoku kwi-inductor iya kwanda; xa i-voltage kwi-inductor ingalunganga, okwangoku kwi-inductor iya kuncipha.

Ukuhla kwe-voltage ye-inductor okanye ukuhla kwe-voltage yangaphambili ye-Schottky diode kwisekethe ye-asynchronous inokungahoywa xa kuthelekiswa negalelo kunye ne-voltage ephumayo.

Ukuzaliswa kwe-inductor core

Ngokusebenzisa i-high current ye-inductor ebalwe, sinokufumanisa oko kuveliswa kwi-inductor. Kulula ukwazi ukuba njengoko i-current ngokusebenzisa i-inductor inyuka, i-inductance yayo iyancipha. Oku kuchongwa ziimpawu ezibonakalayo zezinto ezingundoqo zamagnetic. Ingakanani i-inductance eya kuncitshiswa ibalulekile: ukuba i-inductance iyancitshiswa kakhulu, umguquleli akayi kusebenza ngokufanelekileyo. Xa i-current idlula kwi-inductor inkulu kangangokuthi i-inductor iyasebenza, okwangoku kuthiwa "i-saturation current". Oku kwakhona iparameter esisiseko inductor.

Enyanisweni, i-inductor yokuguqula amandla kwi-conversion circuit isoloko ine-saturation "ethambileyo". Xa ukunyuka kwangoku ukuya kwinqanaba elithile, i-inductance ayiyi kuncipha ngokukhawuleza, ebizwa ngokuba yi-"soft" saturation character. Ukuba ukwanda kwangoku kwakhona, i-inductor iya konakala. Ukwehla kwe-inductance kukho kwiindidi ezininzi zee-inductors.

Ngolu phawu lokuzalisa oluthambileyo, sinokwazi ukuba kutheni ubuncinci be-inductance phantsi kwemveliso ye-DC yangoku bucaciswe kuzo zonke iziguquli, kwaye utshintsho lwangoku lwe-ripple aluyi kuchaphazela kakhulu i-inductance. Kuzo zonke izicelo, i-ripple current ilindeleke ukuba ibe yincinci kangangoko kunokwenzeka, kuba iya kuchaphazela i-ripple ye-voltage ephumayo. Yingakho abantu bahlala bexhalabile malunga ne-inductance phantsi kwemveliso yangoku ye-DC kwaye bangayihoyi i-inductance phantsi kwe-ripple current kwi-Spec.

Oku ngasentla kukuqaliswa kohlalutyo lwangoku lwe-inductor, ukuba ufuna ukwazi ngakumbi malunga ne-inductors, nceda uzive ukhululekile ukuqhagamshelana nathi.