|
Digging up old thread.
I just destroyed my Powertech 13.8V PSU, 20A version, I really only use it for dew heater power. The damage was caused by me reversing polarity and trying to power a friends car amplifier I was to fix.
Anyway this is a powerteck is a cheap typical SMPS that comes in may versions of output rating. I've found the damaged parts,Q1/Q2 switching transistors and some bad caps and are waiting for these but wanted to put it out there that these units can be repaired they are simple. On another note...I am dismayed that this unit appears to have no over voltage nor any other protection built in.
So apart from repairing it I'll be looking at adding some much needed protection like: Overvoltage shutdown; maybe current limit shutdown; basic things but sadly needed. I'm also reverse engineering it into a PCB CAD drawing for the future.
Anyway FWIW, these can be repaired easily but they really are cheap and rough.
A typical computer PSU has much better protection than this unit. In fact I have modified a computer PSU to run @16V DC out for my Gemini 1 mount power, as well and modifying the protection ccts.
Anyway...FWIW and maybe someone in the future will face this same issues and my upcoming drawings and musing might help!
More to follow.
Brendan
|