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Registered Member #514
Joined: Sun Feb 11 2007, 12:27AM
Location: Somewhere in Pirkanmaa, Finland
Posts: 295
What kind of resistor did you use? A 15k resistor will be passing around 15mA of current (when the capacitors are empty), which translates to around 3.5W power loss in the resistor. This is more than enough to fry a low wattage resistor. Perhaps it has gone open circuit?
Edit: Also, your caps are 200V, but your powersupply is capable of charging them up to 330V. Since the capacitors are electrolytic this would be very bad (=a high chance of explosion). Overvolting them even slightly will damage them. Could this have happened?
Since your charging resistor is so high in value, as are the capacitors, the time constant is very long. I suggest monitoring the bank's voltage with a DMM and disconnecting the charger before it reaches 200V, if you haven't been doing this already.
i used a big 7Watt resistor ...it shouldn'n break after that i changed this one into a 10k with 5watt ...and it dign't work too ....
yes my caps are electrolytic caps from old computer power supplies. yes i know i would overcharge them ..so i have a analog voltmeter includesd in my power source and i cut the voltage if it reached 200v.
no i didn't overcharge them , cause i switched the supply at 200v off .
the caps are working great, no exploded one.
at my first try ...i think it needed about 3-5 sec to load them ...and i did NOTHING... but then nothing works
i really don't know what to do , cause i checked everything
a 15K resistor with 7500uF caps yields an RC constant of nearly two minutes, so there is no way your bank could have charged in 5 seconds, as you generally need at least 3-5 timeconstants for a capacitor to pretty much fully charge. My point is there must be some aspect of this that you have originally measured wrong, or perhaps the capacitors have been broken from the start.
now i'm really depressed ... i searched about 6hours to get the fail ... now i have it ... my multimeter was broken and shorted the bank ...so i couldn't load it
now i changed the 10k resistor to a 2k ...the loading time is really long with the 10k one ... the new one is 1/2 watt and it gets hot while charging...but it doesn't burn .
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Power Source /Cap Bank
