3-A Daidaita Mataki-Down Voltage Converter Integrated Circuit IC LMR33630BQRNXRQ1

1.

Ayyukan mai sauya buck shine rage ƙarfin shigarwar da kuma daidaita shi da kaya.Tushen topology na mai sauya buck ya ƙunshi babban maɓalli da na'urar diode da ake amfani da ita yayin hutu.Lokacin da aka haɗa MOSFET a layi daya tare da diode mai ci gaba, ana kiransa mai jujjuya buck mai aiki tare.Ingancin wannan shimfidar mai jujjuya buck ɗin ya fi na masu musanya buck ɗin da suka gabata saboda haɗin kai na MOSFET ƙananan gefe tare da Schottky diode.Hoto na 1 yana nuna tsari na mai musanyar kuɗaɗen aiki tare, wanda shine mafi yawan shimfidar wuri da ake amfani da shi a cikin kwamfutocin tebur da littafin rubutu a yau.

2.

Hanyar lissafi na asali

Maɓallin transistor Q1 da Q2 duka MOSFETs ne na tashar N-tashar.waɗannan MOSFET guda biyu yawanci ana kiran su azaman babban gefe ko ƙananan maɓalli kuma MOSFET ƙananan gefen an haɗa su a layi daya tare da diode Schottky.Wadannan MOSFET guda biyu da diode sune babban tashar wutar lantarki na mai canzawa.Asarar da ke cikin waɗannan abubuwan kuma wani muhimmin sashi ne na jimlar asarar.Girman fitarwa na LC tace za'a iya ƙaddara ta hanyar ƙarfin halin yanzu da ripple.Dangane da takamaiman PWM da aka yi amfani da shi a kowane yanayi, ana iya zaɓar hanyoyin sadarwa na ra'ayi na R1 da R2 kuma wasu na'urori suna da aikin saitin dabaru don saita ƙarfin fitarwa.Dole ne a zaɓi PWM bisa ga matakin wutar lantarki da aikin aiki a mitar da ake so, wanda ke nufin cewa lokacin da aka ƙara mitar, ana buƙatar samun isassun ƙarfin tuƙi don fitar da kofofin MOSFET, wanda ya zama mafi ƙarancin adadin abubuwan da ake buƙata. don madaidaicin mai mu'amala da buck mai aiki tare.

Dole ne mai zane ya fara duba abubuwan da ake buƙata, watau shigarwar V, fitarwar V da fitarwa da kuma buƙatun zafin aiki.Waɗannan buƙatun asali ana haɗa su tare da kwararar wutar lantarki, mita, da buƙatun girman jiki waɗanda aka samu.

3.

Matsayin topologies buck-boost

Buck-boost topologies suna da amfani saboda shigar da ƙarfin lantarki na iya zama ƙarami, girma, ko iri ɗaya da ƙarfin fitarwa yayin da ake buƙatar ƙarfin fitarwa fiye da 50 W. Don ƙarfin fitarwa ƙasa da 50 W, mai juyawa na inductor na farko mai ƙarewa ɗaya (SEPIC) ) zaɓi ne mafi inganci mai tsada yayin da yake amfani da ƴan abubuwa kaɗan.

Masu canza buck-boost suna aiki ne a cikin yanayin buck lokacin da ƙarfin shigar da wutar lantarki ya fi ƙarfin fitarwa kuma a yanayin haɓaka lokacin da ƙarfin shigarwar bai kai ƙarfin fitarwa ba.Lokacin da mai canzawa yana aiki a cikin yanki mai watsawa inda ƙarfin shigarwar yana cikin kewayon ƙarfin fitarwa, akwai ra'ayoyi guda biyu don magance waɗannan yanayi: ko dai matakan buck da haɓaka suna aiki a lokaci guda, ko kuma keɓancewar juyawa tsakanin buck. da matakan haɓakawa, kowanne yawanci yana aiki da rabin mitar sauyawa ta al'ada.Ra'ayi na biyu na iya haifar da ƙarar juzu'i a wurin fitarwa, yayin da ingancin wutar lantarki na iya zama ƙasa da madaidaici idan aka kwatanta da buck na al'ada ko haɓaka aiki, amma mai canzawa zai kasance mafi inganci idan aka kwatanta da ra'ayi na farko.