Kev tshuaj xyuas ntawm ob peb hom kev tswj hwm ntawm Tib Chip Microcomputer Controlling Switching Power Supply
Ib qho yog tias lub microcomputer ib leeg tso tawm qhov hluav taws xob (ntawm DA nti lossis PWM hom), uas yog siv los ua qhov siv hluav taws xob siv hluav taws xob. Txoj kev no tsuas yog hloov pauv qhov qub siv hluav taws xob nrog ib lub tshuab microcomputer nkaus xwb, thiab cov nqi hluav taws xob tso zis hluav taws xob tuaj yeem nkag nrog cov nyees khawm. Ib-chip microcomputer tsis koom nrog lub tswv yim voj voog ntawm lub hwj chim mov, thiab lub hwj chim mov Circuit Court tsis hloov ntau. Txoj kev no yog qhov yooj yim tshaj plaws.
Qhov thib ob yog kom nthuav dav AD ntawm ib leeg-chip microcomputer, tsis tu ncua xyuas qhov tso zis hluav taws xob ntawm lub zog hluav taws xob, kho qhov tso zis ntawm DA raws li qhov sib txawv ntawm cov zis hluav taws xob ntawm lub zog hluav taws xob thiab cov nqi teeb tsa, tswj PWM. nti, thiab indirectly tswj kev ua hauj lwm ntawm lub hwj chim mov. Nyob rau hauv txoj kev no, ib leeg-chip microcomputer tau ntxiv rau cov lus tawm tswv yim ntawm cov khoom siv hluav taws xob, hloov qhov kev sib piv qub thiab qhov txuas txuas ntxiv, thiab cov kev pab cuam ntawm ib leeg-chip microcomputer yuav tsum tau txais yuav qhov nyuaj PID algorithm.
Qhov thib peb yog txhawm rau nthuav dav AD ntawm ib leeg-chip microcomputer, tsis tu ncua xyuas qhov tso zis hluav taws xob ntawm lub zog hluav taws xob, thiab tso tawm PWM tsis raws li qhov sib txawv ntawm qhov tso zis hluav taws xob ntawm lub zog hluav taws xob thiab cov nqi teeb tsa, thiab ncaj qha tswj kev ua haujlwm. ntawm lub hwj chim mov. Nyob rau hauv txoj kev no, ib leeg-chip microcomputer cuam tshuam hauv lub hwj chim mov ua haujlwm tshaj plaws.
Qhov thib peb txoj kev yog qhov zoo tshaj plaws ib leeg-chip microcomputer tswj kev hloov hluav taws xob, tab sis nws kuj muaj qhov xav tau siab tshaj plaws rau ib leeg-chip microcomputer. Nws yuav tsum tau hais tias lub lag luam ceev ntawm ib-chip microcomputer yog ceev, thiab nws muaj peev xwm tso zis PWM yoj nrog ib tug txaus siab zaus. Xws li ib tug microcontroller yog obviously kim.
Qhov ceev ntawm DSP ib leeg-chip microcomputer yog siab txaus, tab sis tus nqi tam sim no kuj siab. Los ntawm kev xav ntawm tus nqi, nws suav nrog ntau feem ntawm cov nqi hluav taws xob, yog li nws tsis haum rau kev siv.
Ntawm cov pheej yig ib leeg-chip microcomputers, AVR series yog qhov ceev tshaj plaws thiab ha
s PWM tso zis, uas tuaj yeem txiav txim siab. Txawm li cas los xij, kev khiav hauj lwm zaus ntawm AVR ib leeg-chip microcomputer tseem tsis siab txaus, thiab nws tsuas yog siv tau xwb. Cia peb xam tshwj xeeb txog qib twg AVR microcontroller tuaj yeem tswj tau qhov hloov pauv hluav taws xob.
Hauv AVR microcontroller, lub moos zaus yog mus txog 16MHz. Yog tias qhov kev daws teeb meem PWM yog 10 me ntsis, ces qhov zaus ntawm PWM nthwv dej, uas yog, kev khiav hauj lwm zaus ntawm kev hloov hluav taws xob yog 16000000 / 1024=15625 (Hz), thiab nws pom tseeb tsis txaus rau lub zog hloov hluav taws xob. ua haujlwm ntawm qhov zaus no (hauv lub suab ntau). Tom qab ntawd coj qhov kev daws teeb meem PWM li 9 me ntsis, thiab qhov kev ua haujlwm zaus ntawm lub zog hloov pauv lub sijhawm no yog 16000000 / 512=32768 (Hz), uas tuaj yeem siv sab nraum lub suab ntau, tab sis tseem muaj qee qhov kev ncua deb ntawm kev khiav hauj lwm zaus ntawm niaj hnub hloov hluav taws xob khoom siv.
Txawm li cas los xij, nws yuav tsum raug sau tseg tias {{0}} kev daws teeb meem me ntsis txhais tau hais tias lub voj voog tig-rau-tawm-tawm ntawm lub hwj chim raj tuaj yeem muab faib ua 512 ntu. Raws li qhov kev tig rov qab muaj kev txhawj xeeb, xav tias lub voj voog ua haujlwm yog 0.5, nws tsuas yog muab faib ua 256 qhov chaw. Xav txog qhov kev sib raug zoo ntawm cov mem tes dav thiab cov zis ntawm cov khoom siv hluav taws xob, nws yuav tsum tau muab tais kom tsawg kawg yog ib nrab, uas yog hais tias, cov khoom siv hluav taws xob tuaj yeem tswj tau tsuas yog 1/128 feem ntau, Txawm hais tias qhov kev hloov ntawm lub load los yog hloov ntawm lub hwj chim mov voltage, lub degree ntawm kev tswj tsuas yog mus kom deb li deb mus txog rau thaum.
Tsis tas li ntawd nco ntsoov tias tsuas muaj ib qho PWM nthwv dej raws li tau piav qhia saum toj no, uas yog kev ua haujlwm nkaus xwb. Yog tias qhov kev ua haujlwm thawb-rub (nrog rau ib nrab-choj) yuav tsum tau, ob lub PWM nthwv dej yuav tsum tau, thiab cov lus hais saum toj no yuav raug txo qis, thiab tsuas yog tswj tau li ntawm 1/64. Nws tuaj yeem ua tau raws li qhov yuav tsum tau siv rau cov khoom siv hluav taws xob tsawg xws li cov roj teeb them, tab sis nws tsis txaus rau cov khoom siv hluav taws xob uas xav tau qhov tseeb tso zis ntau.
