Khetha i-inductor efanele yokushintsha ukunikezwa kwamandla | ULULAME

Kuvele inductor , eyaziwa nangokuthi i-choke, ibonakala "nge-inertia enkulu" yamanje egeleza kuyo. Ngamanye amazwi, ngenxa yokuqhubeka kwe-flux, okwamanje ku-inductor kufanele iqhubeke, ngaphandle kwalokho izokhiqiza i-voltage spike enkulu. I-inductor iyingxenye kazibuthe, ngakho ngokwemvelo inenkinga yokugcwala kazibuthe. Ezinye izinhlelo zokusebenza zivumela ukugcwaliswa kwesikhala kwe-inductance, ezinye izinhlelo zokusebenza zivumela ama- inductors angenye ukuthi afake saturation esuka kunani elithile lamanje, kanti ezinye izinhlelo zokusebenza azikuvumeli ukuthi ama-inductors agcwaliswe, okudinga umehluko kumasekhethi athile.

Ezimweni eziningi, i-inductor isebenza "esifundeni esiqondile", lapho i-inductance ishintshile futhi ayiguquki nge-voltage terminal kanye namanje. Kodwa-ke, kunenkinga engenakunakwa, okungukuthi, ukuvuthwa kwe-inductor kuzoholela kumingcele emibili esabalalisiwe (noma imingcele ye-parasitic), enye iwukumelana okungenakugwemeka okungenakugwemeka, enye i-capacitance esabalalisiwe elahlekile ehlobene nokuvunguza. inqubo nezinto zokwakha.

I-Stray capacitance inomphumela omncane kuma-frequency aphansi, kodwa kancane kancane ibonakala ngokunyuka kwemvamisa. Uma i-frequency ingaphezu kwevelu ethile, i-inductor ingaba isici se-capacitive. Uma i-capacitance elahlekile "igxiliwe" ku-capacitor, izici ze-capacitance ngemva kwemvamisa ethile zingabonwa kusukela kumjikelezo olinganayo we-inductor.

Isimo sokusebenza se-inductor kusekethe

Njengoba nje i-capacitor ine-charge and discharge current, i-inductor nayo inenqubo ye-voltage yokushaja nokukhipha. I-voltage ku-capacitor ilingana nokubalulekile kwamandla wamanje, kanti okwamanje ku-inductor ilingana nokubalulekile kwe-voltage. Uma nje i-inductor voltage ishintsha, izinga lokushintsha lamanje i-di/dt nalo lizoshintsha; i-voltage eya phambili yenza ukuphakama kwamanje ngokuqondile, futhi i-voltage ehlehlayo yenza okwamanje kwehle ngokomugqa.

Kubaluleke kakhulu ukubala i-inductance efanele ukuze ukhethe i-inductor efanelekile kanye ne-output capacitor ukuze uthole ubuncane bokuphuma kwe-voltage ripple.

Ukukhethwa kwe-inductance kokushintshela phansi Ukunikezwa kwamandla

Lapho ukhetha ama-inductors okunikezwa kwamandla okushintshwa kwe-buck, kuyadingeka ukunquma umthamo omkhulu we-voltage wokufaka, i-voltage ephumayo, imvamisa yokushintsha amandla, umjikelezo omkhulu we-ripple kanye nomjikelezo womsebenzi.

Ukukhethwa kwe-inductance kokushintshwa kwe-boost Ukunikezwa kwamandla

Ekubalweni kwe - inductance kokunikezwa kwamandla okushintsha i-boost, ngaphandle kokuthi ubudlelwano phakathi komjikelezo wokusebenza kanye ne-voltage ye-inductance bushintshile, enye inqubo iyafana naleyo yokushintshwa kwamandla kagesi.

Sicela uqaphele ukuthi ngokungafani nogesi webhakede, umthamo wamanje wokunikezwa kwamandla okuthuthukisa awuhlinzeki ngaso sonke isikhathi i-inductor yamanje. Lapho ishubhu yokushintsha ivuliwe, i-inductor yamanje igeleza emhlabathini ngokusebenzisa ishubhu yokushintsha, futhi umthamo wamanje unikezwa yi-capacitor okukhiphayo, ngakho-ke i-capacitor ephumayo kufanele ibe namandla okugcina amandla okwanele ukunikeza okwamanje okudingekayo ngomthwalo. ngalesi sikhathi. Kodwa-ke, ngesikhathi sokuvala ukushintshwa, okwamanje okugeleza nge-inductor akuhlinzeki nje ngomthwalo, kodwa futhi kushaja i-capacitor ephumayo.

Ngokuvamile, lapho inani le-inductance liba likhulu, i-ripple ephumayo izoba yincane, kodwa impendulo eguquguqukayo yokunikezwa kwamandla izoba yimbi nakakhulu, ngakho ukukhethwa kwevelu ye-inductance kungalungiswa ngokuvumelana nezidingo ezithile zohlelo lokusebenza lwesekethe ukuze kuzuzwe. umphumela omuhle kakhulu.

Ukwanda kokushintsha imvamisa kungenza i-inductance ibe mncane, ukuze usayizi womzimba we-inductor ube mncane futhi ulondoloze isikhala sebhodi lesifunda, ngakho-ke ukunikezwa kwamandla okushintshwa kwamanje kunomkhuba wokuvama okuphezulu, ukuze kuhlangatshezwane nezidingo ezincane nezincane. umthamo wemikhiqizo kagesi.

Okungenhla isingeniso sokukhetha i-inductor efanelekile yokunikezwa kwamandla okushintsha. uma ufuna ukwazi okwengeziwe nge-inductor, sicela ukhululeke ukuxhumana nathi.