Power supply 20A overheating power mosfet

AlbertHall

Joined Jun 4, 2014
12,344
No sorry already tried and search for schematic.
I also found out that big resistor which is 0.22 ohm also died and two small transistors, now I am searching for more dead parts.
Can it be some bad part also on right side where is low voltage???
Or I can just check left side?
It is most unlikely to be anything on the right side (especially as you were getting 12V out), but it could possibly be the transformer.
Did you find the snubber components?
 

Roderick Young

Joined Feb 22, 2015
408
No sorry already tried and search for schematic.
I also found out that big resistor which is 0.22 ohm also died and two small transistors, now I am searching for more dead parts.
Can it be some bad part also on right side where is low voltage???
Or I can just check left side?
If you have two supplies, you can check every single resistor and diode with the power off, and I recommend doing that. Note that if there is a controller IC, that may have gone once the transistor blew. This may be of some help: http://pididu.com/wordpress/blog/repair-a-24-volt-electric-bike-charger/
 

Thread Starter

Blisk

Joined Jun 6, 2016
14
I have finally fixed power supply. I have tested all resistors and find out that 5 of them was with wrong resistance (on left side), I assume that happends when it burned out. So I changed resistors and burned transistors and now works like it should.
 
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