Hloov PWM tawm tswv yim tswj hom ntawm lub hwj huam mov
Lub hauv paus ntsiab lus ntawm kev ua haujlwm ntawm PWM hloov lossis cov khoom siv hluav taws xob tas li tam sim no yog qhov kev tswj xyuas hluav taws xob ua haujlwm kaw cov lus tawm tswv yim los ntawm qhov sib txawv ntawm cov teeb liab tswj thiab cov teeb liab siv los kho cov khoom siv hluav taws xob hloov hluav taws xob thaum lub zog hloov pauv, sab hauv. parameters hloov, thiab sab nraud load hloov. Cov zis hluav taws xob lossis tam sim no ntawm cov khoom siv hluav taws xob hloov pauv thiab lwm cov teeb liab tswj tau ruaj khov los ntawm kev siv hluav taws xob pulse dav.
Switching power supply pWM fundamentals
Kev tswj cov qauv ntsuas rau pWM suav nrog cov zis hluav taws xob, qhov hluav taws xob input, cov zis tam sim no, cov zis hluav taws xob inductor, thiab qhov siab tshaj plaws ntawm cov khoom siv hloov pauv. Qhov hloov zaus ntawm pWM feem ntau yog tas li. Txhawm rau ua tiav cov hom phiaj ntawm kev ruaj ntseg hluav taws xob, kev ruaj ntseg tam sim no, thiab lub zog tas li, cov teeb liab no tuaj yeem ua ke los tsim ib lub vojvoog, ob lub voj, lossis ntau lub voj kev tawm tswv yim. Tsis tas li ntawd, nws muaj peev xwm paub txog qee yam ntxiv xws li kev sib koom tam sim no, tiv thaiv kev sib nqus sib nqus, thiab kev tiv thaiv overcurrent. pWM tawm tswv yim tswj hom tam sim no tuaj hauv tsib pawg thawj.
hloov pWM tawm tswv yim tswj hom ntawm lub hwj huam mov
Feem ntau, cov kauj ruam-down chopper hauv daim duab 1 tuaj yeem ua kom yooj yim rau pem hauv ntej hom tseem ceeb Circuit Court, nrog Ug sawv rau hauv kev tswj Circuit Court lub pWM tso zis tsav teeb liab. Lub input voltage Uin, tso zis voltage Uout, switching ntaus ntawv tam sim no (los ntawm point b), thiab inductor tam sim no (los ntawm point c los yog point d) nyob rau hauv lub Circuit Court yuav ua hauj lwm raws li sampling control signals nyob ntawm qhov kev xaiv ntawm ntau yam pWM tawm tswv yim tswj. hom. Lub Circuit Court nyob rau hauv daim duab 2 feem ntau yog siv los hloov cov zis voltage Uout rau hauv lub teeb liab voltage Ue, uas yog tom qab ua tiav los yog xa ncaj qha mus rau lub PWM maub los thaum cov zis voltage Uout yog siv raws li ib tug tswj sampling teeb liab.
Peb txoj haujlwm muaj feem cuam tshuam:
① Txhawm rau lav qhov tseeb voltage tswj nyob rau hauv lub xeev khov kho, qhov sib txawv ntawm cov zis voltage thiab tus nqi teev Uref yog amplified thiab xa rov qab. Txawm hais tias qhov kev ua haujlwm amplifier qhov qhib-loop amplification nce yog qhov tsis muaj kev txwv, nws yog qhov DC amplification nce.
2 Khaws cov khoom siv DC tsawg zaus thiab ua kom lub zog AC cov khoom siv ntau zaus los tsim kom muaj qhov "huv" DC tawm tswv yim tswj cov teeb liab (Ue) nrog rau qee qhov amplitude los ntawm DC voltage teeb liab nrog kev hloov suab nrov ntawm lub dav hlau ntau zaus ntawm qhov tso zis ntawm qhov hloov lub ntsiab Circuit Court. Kev tawm tswv yim tsis tu ncua yuav tsis ruaj khov yog tias qhov attenuation ntawm high-frequency switching suab nrov tsis txaus, thiab cov lus teb dynamic yuav qeeb yog tias lub attenuation ntawm high-frequency switching suab nrov yog ntau dhau vim lub siab zaus thiab loj amplitude ntawm switching suab nrov. . Lub ntsiab lus tsim qauv ntawm qhov kev ua haujlwm tsis zoo ntawm lub tshuab hluav taws xob tseem yog "tsawg zaus nce yuav tsum siab, qhov nce siab yuav tsum qis," txawm tias lawv pom qhov tsis sib xws.
Txhawm rau ua kom lub kaw lus kaw ua haujlwm tsis tu ncua, ua qhov tsim nyog kho rau tag nrho cov kab ke.
yam ntxwv ntawm lub hwj chim mov thaum hloov
1) Txhua pWM tawm tswv yim tswj hom muaj qhov zoo thiab qhov tsis zoo ntawm nws tus kheej. Lub pWM tswj hom yuav tsum raug xaiv thaum tsim ib lub zog hloov hluav taws xob nyob ntawm qhov xwm txheej.
2) Thaum xaiv pWM cov tswv yim tawm tswv yim rau ntau hom kev tswj, nws yog ib qho tseem ceeb uas yuav tau xav txog kev hloov hluav taws xob hloov hluav taws xob qhov kev xav tau tshwj xeeb ntawm cov khoom siv hluav taws xob thiab cov khoom siv hluav taws xob, cov khoom siv hluav taws xob loj thiab cov kev xaiv xaiv, lub suab nrov nrov ntawm cov zis hluav taws xob, thiab ntau yam. lub luag hauj lwm voj voog hloov.
3) PWM tswj hom hloov zuj zus thiab hloov pauv, txuas nrog, thiab tuaj yeem hloov mus rau ib leeg raws li qhov xwm txheej tshwj xeeb.
