Cov Cheebtsam tseem ceeb ntawm BUCK Switching Power Supply
Input filtering Circuit Court
Lub input filtering Circuit Court yog thawj kab ntawm kev tiv thaiv rau BUCK hloov cov khoom siv hluav taws xob, feem ntau yog siv los lim tawm siab -ntau zaus suab nrov thiab clutter nyob rau hauv lub input fais fab mov, kom ruaj ntseg ntawm lub hwj chim mov. Feem ntau, input filtering circuits yog tsim los ntawm cov khoom xws li capacitors, inductors, thiab resistors. Los ntawm qhov tsim nyog parameter tsim, cuam tshuam cov teeb liab hauv cov khoom siv hluav taws xob tuaj yeem raug tshem tawm zoo.
Lub cev muaj zog hloov
Lub hwj chim hloov raj yog ib qho ntawm cov khoom tseem ceeb ntawm BUCK hloov hluav taws xob, thiab nws txoj haujlwm tseem ceeb yog ua kom muaj kev sib kis ntawm lub zog hluav taws xob. Kev ua tau zoo ntawm cov khoom siv semiconductor xws li MOSFETs lossis IGBTs feem ntau yog siv los ua cov khoom siv hluav taws xob hloov hluav taws xob, uas muaj cov yam ntxwv ntawm kev ua haujlwm qis, kev hloov siab ceev, thiab tsis tshua muaj hluav taws xob tam sim no, uas tuaj yeem txhim kho kev ua tau zoo thiab kev ntseeg siab ntawm cov khoom siv fais fab.
Tso zis lim inductor
Cov zis lim dej inductor yog ib qho tseem ceeb ntawm BUCK hloov hluav taws xob, uas feem ntau ua haujlwm kom du cov zis hluav taws xob, lim tawm siab - nrov nrov thiab ripple generated thaum lub sij hawm hloov. Kev xaiv thiab tsim cov zis lim inductors muaj qhov cuam tshuam loj rau kev ua haujlwm ntawm cov khoom siv hluav taws xob thiab yuav tsum tau xaiv kom tsim nyog raws li cov xwm txheej tshwj xeeb thiab cov yam ntxwv ntawm kev thauj khoom.
Output filtering capacitor
Cov zis filtering capacitor thiab tso zis filtering inductor ua ke tsim cov zis filtering Circuit Court ntawm BUCK switching fais fab mov. Nws lub luag haujlwm tseem ceeb yog txhawm rau txhim kho qhov tso zis hluav taws xob thiab txhim kho lub zog ripple kev muaj peev xwm ntawm cov khoom siv hluav taws xob. Kev xaiv cov zis lim capacitors yuav tsum xav txog qhov tsis xws li muaj peev xwm, tiv taus tus nqi hluav taws xob, thiab ESR (sib npaug series tsis kam) kom ntseeg tau tias kev ruaj ntseg thiab kev ntseeg siab ntawm cov khoom siv hluav taws xob.
PWM controller
PWM maub los yog ib qho tseem ceeb ntawm cov khoom siv hauv BUCK hloov hluav taws xob. Nws lub luag haujlwm tseem ceeb yog kho lub sijhawm rau thiab tawm (xws li lub voj voog lub luag haujlwm) ntawm lub hwj chim hloov raj hauv lub sijhawm tiag tiag raws li cov lus pom zoo ntawm cov zis hluav taws xob, txhawm rau ua tiav kev tswj hwm ntawm cov zis hluav taws xob. PWM controllers feem ntau siv siab-kev ua tau zoo digital signal processors (DSPs) lossis microcontrollers (MCUs) ua cov txheej txheem tseem ceeb, ua ke nrog siab -precision analog-rau-digital converters (ADCs) thiab fais fab tsav circuits, kom ua tiav qhov voltage tswj thiab ceev ceev teb.
tiv thaiv Circuit Court
Kev tiv thaiv Circuit Court yog ib qho tseem ceeb ntawm BUCK hloov fais fab mov. Nws lub luag haujlwm tseem ceeb yog saib xyuas cov xwm txheej ua haujlwm ntawm cov khoom siv hluav taws xob thiab ua kom muaj kev tiv thaiv raws sij hawm thaum muaj xwm txheej txawv txav kom ntseeg tau tias muaj kev nyab xeeb ntawm cov khoom siv hluav taws xob. Kev tiv thaiv ib puag ncig muaj xws li kev tiv thaiv overcurrent, tiv thaiv overvoltage, tiv thaiv undervoltage, tiv thaiv overheating, thiab tiv thaiv luv luv Circuit Court. Cov kev tiv thaiv circuits no saib xyuas ntau yam tsis muaj zog ntawm lub zog ntawm lub sijhawm. Thaum kuaj pom cov xwm txheej txawv txav, lawv yuav txiav tawm tam sim ntawd cov khoom siv hluav taws xob lossis txo cov zis hluav taws xob kom tsis txhob muaj kev puas tsuaj rau cov khoom siv hluav taws xob thiab kev thauj khoom.
auxiliary fais fab mov
Cov khoom siv hluav taws xob pabcuam yog ib qho tseem ceeb hauv kev pabcuam hauv BUCK hloov hluav taws xob, uas feem ntau muab kev ruaj khov qis -voltage DC fais fab rau PWM maub los, tiv thaiv Circuit Court thiab lwm yam kev pabcuam. Cov khoom siv hluav taws xob pabcuam feem ntau yog siv los ntawm kev ywj pheej linear regulators lossis hloov cov tswj hwm kom ntseeg tau tias lawv ruaj khov thiab kev ntseeg tau.
