Ukuhlaziywa kwe-inductor yamanje| ULULAME

Idizayini ye- inductor iletha izinselelo eziningi konjiniyela ekwakhiweni kokushintshwa kwamandla kagesi. Onjiniyela akufanele bakhethe kuphela inani le-inductance, kodwa futhi bacabangele okwamanje ukuthi i-inductor ingathwala, ukumelana nokuqina, usayizi wemishini nokunye. Umphumela wamanje we-DC ku-inductor, ozophinde unikeze ulwazi oludingekayo lokukhetha i-inductor efanelekile.

Qonda umsebenzi we-inductor

I-inductor ivame ukuqondwa njenge-L kumjikelezo wesihlungi se-LC ekuphumeni kwamandla okushintshwa (C yi-capacitor ephumayo). Yize lokhu kuqonda kulungile, kuyadingeka ukuthi ube nokuqonda okujulile kokuziphatha kwama-inductors ukuze uqonde ukwakheka kwama-inductors.

Ekuguquleni okuya phansi, umkhawulo owodwa we-inductor uxhunywe ku-voltage yokuphuma kwe-DC. Esinye isiphetho sixhunywe ku-voltage yokufaka noma i-GND ngokushintshashintsha imvamisa.

I-inductor ixhunywe ku-voltage yokufaka nge-MOSFET, futhi i-inductor ixhunywe ku-GND. Ngenxa yokusetshenziswa kwalolu hlobo lwesilawuli, i-inductor ingamiswa ngezindlela ezimbili: ngokubeka phansi kwe-diode noma ngokugxilisa i-MOSFET. Uma kuyindlela yokugcina, isiguquli sibizwa ngemodi ye-"synchronus".

Manje cabanga futhi uma i-current egeleza nge-inductor kulezi zifunda ezimbili iyashintsha. Ingxenye eyodwa ye-inductor ixhunywe ku-voltage yokufaka kanti enye ixhunywe ku-voltage yokuphumayo. Ku-converter eyehlayo, i-voltage yokufaka kufanele ibe phezulu kune-voltage ephumayo, ngakho-ke kuzokwakhiwa ukwehla kwamandla kagesi ku-inductor. Ngokuphambene nalokho, ngesikhathi sesifunda sesi-2, umkhawulo owodwa we-inductor ekuqaleni oxhunywe ku-voltage yokufaka uxhunywe phansi. Ku-converter eyehlayo, i-voltage ephumayo kufanele ibe yinhle, ngakho-ke kuzokwakhiwa ukwehla kwamandla kagesi ku-inductor.

Ngakho-ke, lapho i-voltage ku-inductor ilungile, okwamanje ku-inductor izokhula; lapho i-voltage ku-inductor ingalungile, okwamanje ku-inductor izokwehla.

Ukwehla kwe-voltage ye-inductor noma ukwehla kwe-voltage eya phambili ye-Schottky diode kusekethe ye-asynchronous kungase kunganakwa uma kuqhathaniswa ne-voltage yokufaka neyokukhiphayo.

Ukugcwala kwe-inductor core

Ngokusebenzisa amandla aphezulu we-inductor ebaliwe, singathola ukuthi yini ekhiqizwa ku-inductor. Kulula ukwazi ukuthi njengoba i-current ngokusebenzisa i-inductor ikhula, i-inductance yayo iyancipha. Lokhu kunqunywa izici ezibonakalayo ze-magnetic core material. Ingakanani inductance ezoncishiswa ibalulekile: uma i-inductance iyancipha kakhulu, isiguquli ngeke sisebenze kahle. Lapho ukudlula kwamanje ku-inductor kukhulu kangangokuthi i-inductor iyasebenza, yamanje ibizwa ngokuthi "saturation current". Lona futhi ipharamitha eyisisekelo ye-inductor.

Eqinisweni, i-inductor yamandla eshintshayo kumjikelezo wokuguqula ihlale ine-saturation "ethambile". Lapho ukwanda kwamanje ngezinga elithile, i-inductance ngeke yehle kakhulu, ebizwa ngokuthi "i-soft" saturation isici. Uma ukwanda kwamanje futhi, i-inductor izolimala. Ukwehla kwe-inductance kukhona ezinhlotsheni eziningi zama-inductors.

Ngalesi sici esithambile sokugcwaliswa kwesikhala, singakwazi ukwazi ukuthi kungani ubuncane be-inductance ngaphansi kwe-DC okukhiphayo yamanje bucaciswe kuzo zonke iziguquli, futhi ukuguqulwa kwe-ripple current ngeke kuthinte kakhulu i-inductance. Kuzo zonke izinhlelo zokusebenza, i-ripple current ilindeleke ukuthi ibe mncane ngangokunokwenzeka, ngoba izothinta i-ripple ye-voltage ephumayo. Yingakho abantu behlala bekhathazekile mayelana ne-inductance ngaphansi kwamandla okukhiphayo we-DC futhi banganaki i-inductance ngaphansi kwe-ripple current ku-Spec.

Okungenhla ukwethulwa kokuhlaziywa kwamanje kwe-inductor, uma ufuna ukwazi okwengeziwe ngama-inductors, sicela ukhululeke ukuxhumana nathi.