Microcontroller tswj ntawm switching fais fab mov ntau yam tswj hom tsom xam
Microcontroller tswj ntawm switching fais fab mov, los ntawm kev tswj ntawm lub hwj huam mov tso zis ib leeg, muaj peev xwm muaj ntau txoj kev tswj.
Ib qho yog tias lub microcontroller 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 lub microcontroller hloov pauv qhov qub siv hluav taws xob, koj tuaj yeem siv tus yuam sij nkag mus rau qhov tso zis hluav taws xob tus nqi ntawm lub zog hluav taws xob, lub microcontroller tsis koom nrog cov lus tawm tswv yim ntawm lub hwj huam mov, lub hwj huam mov Circuit Court tsis muaj kev hloov. Txoj kev no yog qhov yooj yim tshaj plaws.
Qhov thib ob yog tias lub microcontroller txuas ntxiv rau AD, niaj hnub kuaj pom qhov tso zis hluav taws xob ntawm lub zog hluav taws xob, raws li qhov sib txawv ntawm qhov tso zis hluav taws xob ntawm lub zog hluav taws xob thiab cov nqi teeb tsa, kho qhov tso zis ntawm DA, tswj PWM nti, thiab indirectly tswj lub hwj chim mov. Txoj kev no lub microcontroller tau ntxiv rau cov lus tawm tswv yim ntawm cov khoom siv hluav taws xob, es tsis yog qhov kev sib piv qub ntawm qhov txuas txuas ntxiv, qhov kev pab cuam microcontroller siv cov PID algorithm nyuaj dua.
Qhov thib peb yog lub microcontroller txuas ntxiv rau AD, tas li tshawb xyuas qhov tso zis hluav taws xob ntawm cov khoom siv hluav taws xob, raws li cov khoom siv hluav taws xob tso tawm hluav taws xob thiab qhov sib txawv ntawm cov nqi teeb tsa, cov zis PWM nthwv dej, ncaj qha tswj cov khoom siv hluav taws xob. Ua li no lub microcontroller cuam tshuam rau hauv lub hwj chim mov ua hauj lwm feem ntau.
Qhov thib peb txoj kev yog qhov meej tshaj plaws microcontroller tswj switching fais fab mov, tab sis qhov yuav tsum tau ntawm microcontroller kuj yog siab tshaj. Cov kev xav tau rau microcontroller xam nrawm, thiab tuaj yeem tso tawm lub zog txaus PWM yoj. Xws li ib tug microcontroller yog obviously kim.
DSP chav kawm microcontroller ceev yog siab txaus, tab sis tam sim no tus nqi kuj tseem siab heev, los ntawm cov nqi txiav txim siab, accounting rau ntau dhau ntawm cov nqi ntawm cov khoom siv fais fab, yuav tsum tsis txhob siv.
Pheej yig microcontroller, AVR series yog qhov ceev tshaj plaws, nrog PWM tso zis, tuaj yeem txiav txim siab. Txawm li cas los xij, kev khiav hauj lwm zaus ntawm AVR microcontroller tseem tsis siab txaus, tsuas yog siv tau xwb. Ntawm no peb tshwj xeeb suav AVR microcontroller ncaj qha tswj kev hloov hluav taws xob ua haujlwm tuaj yeem ncav cuag qib twg.
AVR microcontroller, lub moos siab tshaj plaws ntawm 16MHz, yog tias PWM daws teeb meem ntawm 10-ntsis, ces qhov zaus ntawm PWM nthwv dej kuj yog qhov ua haujlwm zaus ntawm kev hloov hluav taws xob 16000000/1024=15625 (Hz), switching fais fab mov ua hauj lwm ntawm no zaus yog obviously tsis txaus (nyob rau hauv lub suab ntau). Tom qab ntawd coj PWM daws teeb meem ntawm 9 ntsis, lub sijhawm no lub sijhawm ua haujlwm zaus ntawm lub zog hloov pauv 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 haujlwm zaus ntawm niaj hnub hloov hluav taws xob khoom siv.
Nws yuav tsum raug sau tseg, txawm li cas los xij, qhov kev daws teeb meem ntawm {{0}} me ntsis txhais tau hais tias lub hwj chim raj conduction - tawm hauv lub voj voog no, tuaj yeem muab faib ua 512 ntu, ntawm kev coj ua ib leeg, piv txwv li lub voj voog ntawm 0.5, tuaj yeem muab faib ua 256 feem. Kev coj mus rau hauv tus account lub siab dav thiab cov khoom siv hluav taws xob tso tawm tsis yog kev sib raug zoo, qhov xav tau tsawg kawg yog lwm qhov luv nqi, uas yog, lub zog hluav taws xob tso tawm tsuas tuaj yeem tswj tau qhov siab tshaj plaws ntawm 1/128, txawm tias qhov hloov pauv lossis lub network. fais fab mov voltage hloov, qhov degree ntawm kev tswj tsuas yog mus txog rau qhov no.
Nco ntsoov tias tsuas muaj ib qho PWM nthwv dej tau piav qhia saum toj no, uas yog ib qho kawg. Yog tias koj xav thawb-rub ua haujlwm (suav nrog ib nrab-choj), tom qab ntawd koj xav tau ob lub PWM nthwv dej, qhov kev tswj hwm saum toj no yuav tsum raug txiav ib nrab, tuaj yeem tswj tau li ntawm 1/64 ntawm lub zog hluav taws xob tsis tas yuav tsum muaj qib siab. kev them nyiaj, xws li roj teeb, tuaj yeem ua tau raws li qhov yuav tsum tau siv, tab sis rau qhov yuav tsum tau ntawm cov khoom siv hluav taws xob tso tawm qhov tseeb yog siab dua, qhov no tsis txaus.
