Switching Power Supply Overhaul Tips
Switching power supply troubleshooting yog ib qho yooj yim thiab nyuaj, tab sis tsuav yog koj tuav lub hauv paus ntawm tej yam, uas yog, tag nrho paub txog cov qauv yooj yim thiab cov yam ntxwv ntawm lub switching fais fab mov, nws yuav muaj peev xwm sai sai los daws teeb meem switching power supply, ua tiav ob zaug qhov tshwm sim nrog ib nrab ntawm kev siv zog. Cov kev kawm hluav taws xob hauv qab no rau txhua tus neeg los qhia txog kev hloov hluav taws xob hloov kho dua tshiab.
1 rau kev tuav pov hwm kub hnyiab los yog kib faults feem ntau kuaj xyuas 300V ntawm cov lim loj capacitors, rectifier choj diodes thiab hloov cov raj thiab lwm qhov ntawm cov teeb meem cuam tshuam hauv Circuit Court kuj tuaj yeem ua rau muaj kev pov hwm kub hnyiab, dub. Teeb meem nrog kev tiv thaiv kev cuam tshuam Circuit Court kuj tuaj yeem ua rau muaj kev pov hwm kub hnyiab, dub. Nws yuav tsum tau muab sau tseg hais tias: vim lub breakdowns ntawm lub switching tube tshwm sim los ntawm cov kev tuav pov hwm burning feem ntau yog lub tam sim no nrhiav kom tau resistor thiab lub hwj chim tswj nti hlawv tawm. Tsis zoo kub coefficient thermistor kuj yooj yim rau hlawv ua ke nrog lub fuse.
2. Vim tsis muaj qhov tso tawm, lub fuse yog ib txwm, qhov tshwm sim no qhia tau hais tias lub zog hloov pauv tsis ua haujlwm lossis nkag mus rau hauv lub xeev tiv thaiv. Ua ntej tshaj plaws, ntsuas lub zog tswj nti pib Yog tias tsis muaj qhov pib hluav taws xob lossis qhov pib qhov hluav taws xob qis dhau, ces peb yuav tsum xyuas qhov pib resistor thiab pib cov khoom sab nraud ntawm ko taw to, lub sijhawm no, yog tias lub zog hluav taws xob yog. lub hwj chim tswj nti yog qhov qub, cov kev txheeb xyuas saum toj no tuaj yeem pom qhov txhaum sai sai. Yog tias muaj qhov pib qhov hluav taws xob, tom qab ntawd ntsuas qhov tso tawm ntawm cov tswj nti hauv lub sijhawm khau raj seb puas muaj qhov dhia siab thiab qis. Yog tias tsis muaj kev dhia, cov nti tswj tsis zoo, cov khoom siv hluav taws xob peripheral oscillation Circuit Court lossis teeb meem tiv thaiv Circuit Court, tuaj yeem hloov cov tswj nti, thiab tom qab ntawd xyuas cov khoom siv peripheral; Yog tias muaj kev dhia, cov nti tswj tsis zoo, cov khoom siv hluav taws xob peripheral oscillation Circuit Court lossis teeb meem tiv thaiv Circuit Court, tuaj yeem hloov cov nti tswj, thiab tom qab ntawd xyuas cov khoom siv peripheral. Yog tias muaj qhov dhia, feem ntau tsis zoo los yog puas hloov lub raj.
3. Rau qhov tso zis voltage, tab sis cov zis voltage siab dhau rau qhov txhaum no feem ntau yog los ntawm regulator sampling thiab regulator control circuit. Nyob rau hauv DC tso zis, sampling resistor, DC tso zis, sampling resistor, yuam kev sampling amplifier xws li TL431, optocoupler, hwj chim tswj nti thiab lwm yam circuits ua ke ua ib tug kaw lub voj, ib tug ntawm cov teeb meem yuav ua rau cov zis voltage nce.
4. Switching fais fab mov load muaj ib tug short-circuit txhaum (tshwj xeeb tshaj yog DC / DC converter luv luv Circuit Court los yog tsis ua hauj lwm, thiab lwm yam), nyob rau lub sij hawm no, koj yuav tsum disconnect tag nrho cov switching fais fab mov Circuit Court load, thiaj li yuav paub qhov txawv ntawm lub switching. Lub sijhawm no, koj yuav tsum txiav tawm tag nrho cov khoom tsis zoo ntawm cov khoom siv hluav taws xob hloov hluav taws xob kom paub qhov txawv ntawm qhov hloov hluav taws xob hloov hluav taws xob lossis cov khoom siv hluav taws xob tsis raug. Yog hais tias koj disconnect lub load Circuit Court voltage tso zis yog ib txwm, qhia tias lub load yog hnyav heev; los yog tseem tsis yog ib txwm hais tias lub switching fais fab mov Circuit Court yog faulty. Lub switching fais fab mov Circuit Court yog faulty.
5. Rau qhov tso zis voltage kawg ntawm lub rectifier diode, lim capacitor tsis ua haujlwm, koj tuaj yeem txiav txim los ntawm kev hloov pauv.
