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Old 24th September 2002, 03:10 PM   #1
Electrons are yellow and more is better!
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Default Warm capacitors in power supply


Check my QSXPS power supply. The large 4700µF caps gets noticable warm. Why? Is it stressing to have this kind of R-C filter? Obviously, but why?

The 470µF don't get warmed up.
/Per-Anders (my first name) or P-A as my friends call me
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Old 24th September 2002, 03:29 PM   #2
UrSv is offline UrSv  Sweden
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Not that it means anything but I can see no reason why they should be warmer than any other cap in a low power supply. To me it seems that there is something wrong with the cap...

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Old 24th September 2002, 03:45 PM   #3
hifi is offline hifi  Sweden
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Are they taking hevy ripple currents? maybe there is something heating them nearby as say a transistor?

is the Resistor getting warm aswell?
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Old 24th September 2002, 09:25 PM   #4
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Default Warm Caps

It is due to the large aluminum can it s very common in tv set that some capacitor takes the heat, your PS has two heatsinks and they will run hot, the heat radiation will reach the big 4700 cans.
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Old 24th September 2002, 10:34 PM   #5
artnyos is offline artnyos  United States
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Default Check my QSXPS power supply

Peranders is playing a little joke on us all. Not an extreme joke, just a little one. He is quite aware the the large caps are connected by an inch or two of heavy PCB trace (copper is an excellent thermal conductor) to the collector of the pass transistors and that the transistor package is designed
for a low thermal resistance to the collector lead. The 470uF is decoupled thermally by the series resistor and longer PCB trace length from the pass transistor. He is also surely aware that an RC filter limits the peak charging current to the filter caps and puts less stress on them and not more. He is having a bit of Swedish fun with us and teasing us to look at his website. An Extremely funny and clever joke Peranders! I hope I did not spoil your fun too soon. By the way, did everyone notice that the powe supply PCBs are for sale.


P.S. You are a noty boy.
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