Lub hauv paus ntsiab lus ntawm kev hloov fais fab mov PWM
Lub hauv paus ntsiab lus ntawm kev ua haujlwm ntawm PWM hloov lossis lub zog tam sim no tsis tu ncua yog tias thaum lub zog hloov pauv hloov pauv, cov kev hloov pauv sab hauv, thiab cov khoom siv sab nraud hloov pauv, cov kev tswj xyuas ua haujlwm kaw-loop tawm tswv yim los ntawm qhov sib txawv ntawm cov teeb liab tswj thiab cov teeb liab siv. los kho lub switching ntaus ntawv ntawm lub ntsiab Circuit Court. Lub conduction mem tes dav ua rau cov zis voltage los yog tam sim no ntawm switching fais fab mov thiab lwm yam kev tswj cov teeb liab ruaj khov.
Lub hauv paus ntsiab lus ntawm kev hloov fais fab mov pWM
Kev hloov pauv zaus ntawm pWM feem ntau yog tas li, thiab cov qauv tswj cov cim muaj xws li: cov zis voltage, input voltage, tso zis tam sim no, tso zis inductor voltage, thiab ncov tam sim no ntawm kev hloov khoom siv. Cov teeb liab no tuaj yeem tsim ib lub voj voog, ob lub voj lossis ntau lub voj kev tawm tswv yim kom ua tiav lub hom phiaj ntawm kev ruaj ntseg voltage, kev ruaj khov tam sim no thiab lub zog tas li. Tib lub sijhawm, qee qhov haujlwm ntxiv xws li kev tiv thaiv overcurrent, anti-bias magnetic teb, thiab kev sib koom tam sim no tuaj yeem pom tau. Tam sim no muaj feem ntau yog tsib pWM tawm tswv yim tswj hom.
Hloov fais fab mov pWM tawm tswv yim tswj hom
Feem ntau hais lus, cov kauj ruam-down chopper qhia nyob rau hauv pem hauv ntej lub ntsiab Circuit Court yog ib tug yooj yim sawv cev, thiab Ug sawv cev rau pWM tso zis tsav teeb liab ntawm kev tswj Circuit Court. Raws li kev xaiv ntawm pWM tawm tswv yim sib txawv tswj hom, input voltage Uin, output voltage Uout, switching ntaus ntawv tam sim no (los ntawm point b), thiab inductor tam sim no (los ntawm point c lossis point d) hauv Circuit Court tuaj yeem siv ua piv txwv. tswj cov cim. Thaum cov zis hluav taws xob Uout siv los ua lub teeb liab tswj kev ntsuas, nws feem ntau yog ua tiav los ntawm lub voj voog uas pom hauv daim duab 2 kom tau txais lub teeb liab voltage Ue, uas yog tom qab ua tiav lossis xa ncaj qha mus rau PWM maub los. Lub zog ua haujlwm amplifier (e / a) muaj peb txoj haujlwm:
① Qhov sib txawv ntawm qhov tso zis hluav taws xob thiab qhov muab hluav taws xob Uref tau nthuav dav thiab pub rov qab los xyuas kom meej qhov hluav taws xob tswj qhov tseeb hauv lub xeev khov kho. DC amplification nce ntawm kev ua haujlwm amplifier yog qhov theoretically infinite, tab sis nws yog qhov qhib-loop amplification nce ntawm kev ua haujlwm amplifier.
② Hloov lub DC voltage teeb liab nrog kev hloov suab nrov ntawm qhov dav dav ntawm cov khoom siv hluav taws xob hloov pauv mus rau qhov "huv" DC tawm tswv yim tswj teeb liab (Ue) nrog qee qhov amplitude, uas yog, khaws DC tsawg zaus. Cheebtsam thiab attenuate AC high-frequency Cheebtsam. Vim hais tias qhov zaus ntawm kev hloov suab nrov yog siab thiab lub amplitude yog loj, yog hais tias lub attenuation ntawm high-frequency switching suab nrov tsis txaus, cov lus qhia nyob rau hauv lub xeev yuav tsis ruaj khov; Yog hais tias lub attenuation ntawm high-frequency switching suab nrov heev, lub dynamic teb yuav qeeb. Txawm hais tias tsis sib haum xeeb rau ib leeg, lub hauv paus tsim qauv ntawm qhov kev ua haujlwm tsis zoo ntawm lub tshuab hluav taws xob ua haujlwm tseem yog "tsawg zaus nce yuav tsum siab, siab zaus nce yuav tsum tsawg".
③ Kho tag nrho lub voj kaw kaw kom lub kaw lus kaw ua haujlwm ruaj khov.
Switching power supply pWM yam ntxwv
1) Txawv pWM tawm tswv yim tswj hom muaj lawv tus kheej qhov zoo thiab qhov tsis zoo. Thaum tsim cov khoom siv hluav taws xob hloov pauv, qhov tsim nyog pWM tswj hom yuav tsum raug xaiv raws li qhov xwm txheej tshwj xeeb.
2) Kev xaiv ntawm pWM tawm tswv yim txoj hauv kev rau ntau hom kev tswj yuav tsum coj mus rau hauv tus account cov tswv yim tshwj xeeb thiab cov khoom siv hluav taws xob ntawm cov khoom siv hluav taws xob hloov hluav taws xob, cov khoom siv hluav taws xob tseem ceeb thiab kev xaiv cov khoom siv, cov suab nrov nrov ntawm cov zis hluav taws xob, thiab ntau yam. ntawm lub luag hauj lwm voj voog hloov.
3) PWM tswj hom tsim thiab hloov pauv, sib cuam tshuam, thiab tuaj yeem hloov pauv mus rau ib leeg hauv qee qhov xwm txheej.
