12V 10A switching power supply (with schematic and explanation)
The schematic in my DB of reverse engineered schematics:
http://danyk.cz/reverz44_en.html
Today I made a teardown of an industrial switching power supply module S-120W-12 in a metal housing. The input is 100-240V AC mains and the output is 12V DC 10A 120W. It came from Ebay and it cost me only $8. In the listing it's called "switching power supply LED driver adapter", but it may have a lot of uses other than just powering LED strips. The SMPS is based on the old good UC3842 control chip, TL431 voltage reference and an 817 optocoupler. It has an open loop protection added, made of discrete transistors. It also has a softstart, a proper fuse, NTC thermistor, safety capacitors, snubber networks, EMI filters, good isolation distance and a relatively safe-looking transformer. The only problem of this switching power supply is the way the power transistor and diode are mounted on the heatsink! Just the sharp corner of it actually touches the aluminium plate! This video got quite long, but it's not easy to cover such a complex appliance in just few minutes. I didn't even get to explain why is the power supply clicking when in short circuit and why it may produce audible noise (whistling) if there was no slope compensation.
You can support me on Patreon:
https://www.patreon.com/DiodeGoneWild
My Instagram:
https://www.instagram.com/savage_danyk/
Видео 12V 10A switching power supply (with schematic and explanation) канала DiodeGoneWild
http://danyk.cz/reverz44_en.html
Today I made a teardown of an industrial switching power supply module S-120W-12 in a metal housing. The input is 100-240V AC mains and the output is 12V DC 10A 120W. It came from Ebay and it cost me only $8. In the listing it's called "switching power supply LED driver adapter", but it may have a lot of uses other than just powering LED strips. The SMPS is based on the old good UC3842 control chip, TL431 voltage reference and an 817 optocoupler. It has an open loop protection added, made of discrete transistors. It also has a softstart, a proper fuse, NTC thermistor, safety capacitors, snubber networks, EMI filters, good isolation distance and a relatively safe-looking transformer. The only problem of this switching power supply is the way the power transistor and diode are mounted on the heatsink! Just the sharp corner of it actually touches the aluminium plate! This video got quite long, but it's not easy to cover such a complex appliance in just few minutes. I didn't even get to explain why is the power supply clicking when in short circuit and why it may produce audible noise (whistling) if there was no slope compensation.
You can support me on Patreon:
https://www.patreon.com/DiodeGoneWild
My Instagram:
https://www.instagram.com/savage_danyk/
Видео 12V 10A switching power supply (with schematic and explanation) канала DiodeGoneWild
Показать
Комментарии отсутствуют
Информация о видео
Другие видео канала
24V 10A 240W power supply - test, failure, teardown and fix5V 2A SMPS - test, teardown, schematic, explanation, improvementsRepairing cheap power supplies!220V to 12V 10A Power Supply.Modify 12V power supply to 24V 36V 48V24V 4A 100W LED Switching Power Supply - test, schematic & explanation12V 50A 600W power supply - (re)winding the transformerDANGEROUS Chinese USB charger (no isolation in the transformer!)Switch Mode Power Supply Repair, SMPSLi-ion drill charger analysis (with schematic, measurements, waveforms)How SMPS works | What Components We Need? Switched Mode Power Supply850W computer power supply - how does it work (with schematics)Microwave oven - how does it work & how to fix itSimple 12V 1A LED Power Supply - with schematic and transformer autopsySwitching power supply repair. Testing transistors & diodes.Fixing the switching power supply of a power tool chargerHow Does a Switching Power Supply Work 1 (schematic, explanation, example, modifications)inside 12/230V 1000W DC/AC inverter (unedited)#79 Basics of switching mode power supplysSMPS Tutorial (1): Introduction - Switched Mode Power Supplies and Power Conversion