Troubleshooting inverter switching fais fab mov nrog tsis muaj peev xwm load
Ib leeg-tube nws tus kheej zoo siab oscillation shunt regulator switching fais fab mov, qhov txhaum yog unplugged MCU motherboard tso zis voltage yog ib txwm. Txuas nrog lub motherboard, hloov lub hwj chim mov hiccups (intermittent oscillation). Cov kws kho qub qub dhau los ntawm daim tshev kom tsis muaj txiaj ntsig, tau hla lub voj voog, xav tias txawv me ntsis: cov lus teb optocoupler PC1 3\4 ko taw zoo li poob? Saib ze, tab sis tsis tiag tiag down.
Ua ntej tshaj plaws, txiav tawm qhov ua rau overload. Tus so ntawm lub oscillation thiab voltage regulator Circuit Court, nrog rau cov suav tsuas yog kaum yim yam, xyuas tag nrho cov dua yog tsis nyuaj. Txheeb xyuas dua, tsis muaj teeb meem.
Qhov teeb meem nyob rau hauv txoj kev sib txuas ntawm PC1, uas yog tib yam li ntawm lub Hoobkas. Rov qab sim yuav tsum tsis txhob muaj teeb meem, txoj cai, thim rov qab, hiccups hnyav dua. Obviously tsis yog qhov teeb meem.
Kev sib piv ntawm cov circuits zoo sib xws, nws tus nqi R2 yog qhov loj, nrog 100 ohm resistor hloov, rov qab mus rau qhov qub.
Tseem muaj kev nyuaj siab ntawm PC1 kev twb kev txuas, xav rau ib lub sij hawm ntev tsis tuaj yeem pab tau tab sis dumbfounded: PC1 tso zis sab ntawm cov photosensitive transistor, transistor - ntsuas nws amplification ntawm cov neeg muaj qhov kev paub no: transistor thim rov qab tuaj yeem dhau ah, tab sis tsis zoo li yav tom ntej. thov los ntawm xwb. Yog li kev siv cov kev tswj xyuas tam sim no rov qab T2, shunt regulator tswj kuj tau tsim.
Yog li xaus: tsis muaj peev xwm thauj khoom, qhov tseem ceeb heev tus nqi ntawm R2, yog li T1 excitation muaj peev xwm vim me me. Yog li ntawd, sim rau PC1 3/4 tus pin "zoo" dhau qhov kev coj ua, thiab cov neeg nqhis dej tsis txhob noj ntsev, qhov "txhim yam raug cai" txoj hauv kev yog ua kom tsis muaj zog T1 excitation muaj peev xwm ntawm qhov xwm txheej, thiab yog li qhov kev ua haujlwm tsis zoo yog qhov hnyav dua (tus kws kho mob tau sau cov tshuaj tsis raug raws li qhov tsis raug). tshuaj yog qhov tshwm sim no ah).
