Cov ntsiab lus tseem ceeb ntawm kev hloov hluav taws xob hloov hluav taws xob
Thaum debugging lub zog hloov pauv, ntxiv rau kev siv lub voltmeter los ntsuas qhov voltage ntawm tus pins ntawm cov khoom muaj feem xyuam hauv kev tswj xyuas Circuit Court, nws yog ib qho tseem ceeb uas yuav tsum tau siv lub oscilloscope los soj ntsuam qhov cuam tshuam qhov hluav taws xob waveforms txhawm rau txiav txim seb lub zog hloov pauv. kev muab khoom yog nyob rau hauv qhov kev ua haujlwm zoo tshaj plaws. Kab lus no feem ntau piav qhia txog kev xaiv ntawm oscilloscope xeem cov ntsiab lus. Piv txwv li, thaum qhov ntsuas qhov ntsuas yog qhov tso zis tus pin ntawm PWM tswj nti, ib qho oscilloscope tuaj yeem siv los ntsuas ob qho tseem ceeb ntawm kev tsav tsheb pulse amplitude thiab lub voj voog ua haujlwm.
Kev xaiv cov ntsiab lus xeem yog qhov tseem ceeb heev. Kev xaiv tsim nyog ntawm cov ntsiab lus xeem tuaj yeem tsis tsuas yog ua kom muaj kev nyab xeeb ntawm kev debugging, tab sis kuj tseem cuam tshuam txog kev ua haujlwm ntawm kev hloov hluav taws xob thiab ua kom yooj yim rau kev debugging.
Cov ntsiab lus xeem xaiv ntawm kev hloov hluav taws xob muaj nyob hauv daim duab 7-3-1. Qhov ntsuas qhov ntsuas TP1 yog qhov ntws ntawm MOSFET lub hwj chim hloov raj, TP2 yog lub hauv paus ntawm lub raj hloov, Rs yog qhov ntsuas tam sim no, thiab TP3 yog qhov tsis zoo ntawm cov thawj high-voltage circuit. Peb tuaj yeem txuas ob lub ntsiab lus ntsuas TP1 thiab TP2 mus rau ob qhov kev tawm tswv yim (CH1 thiab CH2) ntawm ob txoj kab ke oscilloscope, thiab saib xyuas qhov voltage waveforms ntawm ob lub ntsiab lus tib lub sijhawm. Nyob rau lub sijhawm no, hauv av terminals ntawm ob qhov kev sojntsuam yuav tsum tau txuas nrog tus ncej tsis zoo ntawm thawj lub tswv yim DC Circuit Court tib lub sijhawm, uas yog, txoj haujlwm TP3. Thaum lub sij hawm ntsuas qhov tseeb, lub hauv av clip ntawm kev sojntsuam tuaj yeem clamped ncaj qha rau hauv av tus pin ntawm Rs.
Los ntawm TP1, peb tuaj yeem pom cov dej ntws tawm ntawm lub hwj chim hloov raj. Cov yoj no tuaj yeem cuam tshuam cov ntaub ntawv xws li ntws qhov siab tshaj qhov hluav taws xob, tawm tswv yim DC siab voltage, theem nrab rov qab qhov hluav taws xob, hloov lub raj xa hluav taws xob poob, thiab kev ua haujlwm thiab lub sijhawm txiav tawm. Nyob rau hauv ib qho kawg flyback switching fais fab mov, qhov ntws voltage waveform ntawm lub hwj chim hloov raj yog qhia nyob rau hauv daim duab 7-3-2.
Los ntawm TP2, koj tuaj yeem pom qhov voltage waveform ntawm lub hwj chim hloov raj. Qhov no waveform yog qhov voltage waveform ntawm tus qauv resistor Rs, uas muaj peev xwm cuam tshuam cov ntaub ntawv xws li ntws tam sim no, tig-on thiab tig-tawm lub sij hawm. Cov dej ntws tam sim no ntawm lub hwj chim hloov raj yog qhia hauv daim duab 7-3-3. Qhov no waveform qhia tau hais tias lub zog hloov hluav taws xob ua haujlwm hauv hom tam sim no tsis tu ncua. Hauv txhua lub voj voog, thaum lub raj hloov pauv tau qhib, cov dej ntws tam sim no pib nce los ntawm qhov tsawg kawg nkaus pib tam sim no. Ua ntej lub tshuab hluav taws xob hloov hluav taws xob raug kaw, cov dej ntws mus txog qhov siab tshaj plaws.
