Fault Troubleshooting for Poor Load Capacity of Frequency Converter Switching Power Supply
Qhov no yog ib lub raj uas nws tus kheej zoo siab oscillation shunt stabilized switching fais fab mov. Qhov txhaum yog tias qhov tso zis hluav taws xob ntawm txhua qhov hluav taws xob ntawm MCU motherboard yog qhov qub tom qab tshem tawm nws. Txuas lub motherboard thiab qhib / tawm lub hwj huam mov, ua rau tsis sib xws oscillation. Tus kws kho mob yav dhau los tau tshawb nrhiav thoob plaws tab sis tsis pom qhov tshwm sim. Tom qab noj dhau lawm, nws ncaj nraim rau hauv Circuit Court thiab xav tias txawv me ntsis: lub 3rd thiab 4 tus pins ntawm lub tswv yim optocoupler PC1 zoo li yuav inverted? Thaum soj ntsuam ze dua, nws tsis yog qhov tawg tiag tiag.
Ua ntej, qhov ua rau overload tau txiav tawm. Qhov seem oscillation thiab voltage stabilization circuits, ua ke, tsuas yog muaj kaum lossis yim yam, yog li nws tsis yooj yim los xyuas lawv tag nrho. Kuv tau tshawb xyuas txhua yam thiab tsis muaj teeb meem.
Qhov teeb meem nyob rau hauv txoj kev sib txuas ntawm PC1, uas yog zoo li no thaum nws tawm hauv lub Hoobkas. Nws yuav tsum tsis txhob muaj teeb meem sim nws upside down, tab sis qhov hiccups yog qhov hnyav dua. Obviously tsis yog qhov teeb meem.
Piv rau cov circuits zoo sib xws, tus nqi R2 yog siab dhau. Hloov nws nrog 100 ohm resistor kom rov ua haujlwm li qub.
Tseem ntxhov siab nrog kev sib txuas ntawm PC1, Kuv tuaj yeem pab tsis tau tab sis luag tom qab xav tau ntev: qhov tso tawm sab ntawm PC1 yog lub transistor photosensitive, thiab transistor - txhua tus uas tau ntsuas nws qhov kev nthuav dav muaj qhov kev paub no: lub transistor tuaj yeem. kuj ua hauj lwm nyob rau hauv thim rov qab, tab sis tsis zoo li nyob rau hauv pem hauv ntej daim ntawv thov. Kev siv rov qab tam sim no los tswj T2 thiab ua tiav kev tswj hluav taws xob shunt kuj tseem siv tau.
Qhov kev txiav txim siab tau kos yog tias qhov tsis muaj peev xwm thauj khoom tsis zoo yog qhov tseem ceeb vim tias tus nqi R2 loj dhau, ua rau muaj peev xwm txo qis T1 excitation. Yog li ntawd, sim "kho" 3/4 tus pin ntawm PC1 zoo li noj ntsev thaum nqhis dej. Qhov "rectifying" mus kom ze ua rau qhov tsis muaj zog T1 excitation muaj peev xwm, thiab yog li qhov kev ua txhaum cai yog exacerbated (tus kws kho mob tau sau cov tshuaj tsis raug thiab cov tshuaj yog tib yam tshwm sim).
Tab sis qhov rov qab siv PC1 tsuas yog ua raws li cov lus hais tias "tau txais nws txoj cai". Txawm li cas los xij, tus tsim qauv kuj dhau qhov kev sim, thiab yeej tsis muaj leej twg paub siv optocouplers li no.
