Peb piv txwv ntawm Switching Power Supply Faults in Frequency Converters
Piv txwv:
Lub 2844 nti yog powered ntawm nyias nrog 6 tus pins tsis muaj pulses, thiab qhov voltage ntawm pins 1, 2, thiab 3 yog qhov qub. Qhov voltage ntawm plaub tus pins yog 1.8V, thiab oscilloscope ntsuas tsis muaj sawtooth mem tes ntawm plaub tus pins; Tus kws kho qub qub tau hloov plaub daim ntawv ua ke. Ntsuas qhov tsis kam ntawm tus pin 4 rau hauv av, uas yog qhov qis dua, thiab lwm cov circuits yog kaum tawm txhiab ohms. Lub tshuab no yog hais txog 3000 ohms. Tshem tawm cov nti thiab nws cov khoom siv peripheral, nrog rau 4 tus pins raug tshem tawm, thiab ntsuas qhov kev tiv thaiv hauv av mus rau 9 kiloohms, uas tsis yog qhov kawg. Pom tseeb, muaj qhov xau ntawm 4-pin los ntawm lub qhov lossis tooj liab ntawv ci thiab 5-pin grounding point. Ntawm no, nruab nrab ntawm plaub tus pins rau hauv av, sim ntxiv 30V DC voltage, thiab cov nqi tam sim no yog kaum ntawm milliamperes thiab tau txais me me. Thaum nws yog me me li ob peb milliamperes, txiav tawm lub hwj chim thiab ntsuas qhov tsis kam ntawm plaub tus pins rau hauv av dua, dhau los ua ntau tshaj 60 kiloohms. Rov qab muab cov nti thiab 4-pin cov khoom, thiab kho lub zog ntawm cov teeb meem.
Ob qho piv txwv:
Nyuaj pib vibration. Tom qab cov nti thiab lub ntsiab hluav taws xob tau siv los ua ke, cov zis ntawm ntxiv 15V yog 11V thiab 24V yog 19V thaum lub zog ua haujlwm, ob qho tib si qis. Qhov ntsuas hluav taws xob ruaj khov yog ntxiv rau 15V, uas yog qhov tseeb tsis yog ntawm qhov pib qhov hluav taws xob stabilization. Lub oscilloscope ntsuas lub 6-pin pulse lub luag haujlwm voj voog, uas yog me me. Tshawb xyuas qhov laj thawj thiab pom tias cov khoom siv hluav taws xob pulse lub voj voog me me, uas cuam tshuam nrog cov xwm txheej ntawm tus pin 1 thiab tus pin 3. 1. Txuas tus pins 2 mus rau cov lus tawm tswv yim optocoupler pins 3 thiab 4, thiab xyuas tias tsis muaj teeb meem nrog qhov voltage. stabilizing Circuit Court. Muaj 18V voltage regulator diode txuas ntawm pins 3 thiab 7. Tom qab tshem tawm, qhov txhaum raug daws.
Qhov qis tso zis hluav taws xob, yog tias tsis yog vim qhov tsis txaus ntawm tus kheej lub zog, yog qhov ua rau muaj kev tswj hwm hluav taws xob lossis overcurrent. Qhov piv txwv no yog tom kawg.
Peb piv txwv:
Hloov fais fab mov, nti fais fab rau thiab lub ntsiab hluav taws xob hauv hluav taws xob, ua haujlwm ib txwm. Tom qab tshem tawm cov chip fais fab mov, nws ua haujlwm ib txwm. Xyuas kom tsis muaj kev thauj khoom luv luv thiab tsis muaj qhov kub thiab txias hauv lub raj hloov. Qhov ua rau tsis txaus ntawm tus kheej lub zog yuav raug txiav tawm. Txawm hais tias lub zog ntawm kev muaj peev xwm excitation tsis txaus, yuav tsis muaj kev hloov pauv tom qab txo qhov pib tsis kam. Nws tseem yog ib qho teeb meem ntawm lub hwj chim los yog excitation nrog pins 5 thiab 7. Obviously, muaj internal circuits ntawm pins 5 thiab 7 ntawm lub nti.
Tom qab hloov lub nti, nws ua haujlwm li qub.
