#168 ATX POWER SUPPLY CIRCUIT DESCRIPTION TL494 TL594 SMPS PWM CONTROLLER
Channel: Haseeb Electronics
Date: 2020-05-18

in this video i explained how does computer atx 200 Watt PSU SMPS TL494 TL594 SMPS PWM CONTROLLER switch mode power supply works. i explained diagram step by step so it will very helpful in smps troubleshooting and easy repair. 
circuit diagram  https://drive.google.com/file/d/17QZIzgLQrashQQ5qbn0EdVIL9pS6ZbjK
because the repair man must know how does the circuit works.
computer ATX power supply have input EMI filter, MOVs, NTC, dual line inductor filter bridge rectifier and capacitor to charge at specific dc level, 
after that there is standby power supply which generates ,  VCC for PWM controller. PG power Good signal is generated after voltage level verification by level comparator. PWM controller receives power ON command from CPU and starts switching, which drives the Inverter section BJTs, MOSFETs, IGBTs, and we receive +12 Volt, - 12 Volt, +5 Volt -ve 5 volt 3.3 volt which is further purified by stabilization circuit. feed back circuit is used to regulate the output voltage, if SMPS makes fluctuations, or any voltage is over voltage or SMPS short circuit the OVER voltage protection circuit controls the output control pin of PWM controller, so that the output will off
this video is useful for
how to repair SMPS
how to repair  AT ATX power supply
fan turns on and then goes OFF
PSU have no output
how to repair computer power supply
how does atx power supply works
how to troubleshoot #computer #AT #ATX #SMPS #PSU #switch #mode #power #supply
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