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4hv.org :: Forums :: General Science and Electronics
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voltage supply malfunction

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loveHV
Mon Apr 13 2009, 03:39PM Print
loveHV 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.

maybe those details can help a bit.

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Mads Barnkob
Mon Apr 13 2009, 04:33PM
Mads Barnkob 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?
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loveHV
Mon Apr 13 2009, 04:36PM
loveHV Registered Member #1854 Joined: Wed Dec 10 2008, 06:09PM
Location: West-Flanders Belgium
Posts: 88
the regulators are running hot and i understand them they must convert about 20V to 9V
and 20V to 12V

power transistors keep their cool.

transformer stays also cool

there are no PMW IC's i think

there are 2 IC's :

LM324N

LM741CN

and the LM324N become's slightly hot
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Steve Conner
Mon Apr 13 2009, 08:42PM
Steve Conner 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.
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loveHV
Tue Apr 14 2009, 12:18PM
loveHV 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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