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Registered Member #1854
Joined: Wed Dec 10 2008, 06:09PM
Location: West-Flanders Belgium
Posts: 88
i have a 0-15V 0-3A regulated power supply
but rescently it start doing really funny things i used it to power the the electronic's of a ignition coil, when i started it it worked but my readings on my supply display were going funny so i stopped immediatly.
but now my if i just run my powersupply unballasted my voltage reading says "infinity" and my current reading 0.03A
so i measured the output voltage with my Multimeter and it says 30V
my supply is the HQ-power PS1503SB
where can the fault be, on wich part of the supply ?
//EDIT
if you have your transformer then your rectifier bridge and behind that your smoothing cap, the voltage after the smoothing cap is the same as the voltage on the output so that means something must have break down i measured the voltages after the regulators in my supply and the regulators are still intact.
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
Ignition coils have some nasty inductive kickbacks that could destroy your psu.
I guess its a smps, if so, it could be the PWM chip (ei. TL494 that is used widely in computer psu's)
It would make sense if its toasted in its references and just puts out its maximum frenquency which would be why the voltage is suddenly at 30V, its driving your poor little transformer into oblivion if your not careful.
How is the temperatures of the different components?
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
We had a bench power supply do this at work recently. It suddenly turned itself up to 54V and destroyed the equipment that was running off it, with an impressive display of smoke and flames.
In our case, it was a loose connector inside the unit, but since you've been running an ignition coil off it, I'd suspect you've blown some piece of silicon.
The fact that the output voltage is exactly the same as the smoothing cap voltage, makes me think that it's one of the power transistors that has failed short. The LM324 and 741 ICs are cheap and easy to get, though, so you might as well replace those too.
Registered Member #1854
Joined: Wed Dec 10 2008, 06:09PM
Location: West-Flanders Belgium
Posts: 88
ok thanks your wright about the power transisters they did break down,and i will replace those IC's
but rescently something weird happend
i tested some components with my multimeter,measured some voltages and when i putted back my case and i started my supply it now shows 0V at 0A did something else broke while i was measuring some voltages ?
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