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  1. #1
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    how to safely discharge a capacitor

    How to discharge Large Capacitor Safely ?

    :)

    •   Alt5th June 2008, 18:23

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    FvM
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    how to discharge a capacitor safely

    With a current limiting resistor of sufficient power capacity.



    •   Alt5th June 2008, 19:00

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    how to discharge a capacitor

    Adding to the response of FvM at small current in the resistor, the safer or long live to the capacitor.



    •   Alt6th June 2008, 16:36

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    discharge large capacitor

    you should have a rsistor parallel to your capacitor and this resistor is usually called the bleeder resistor since the stored energy is being discharge to the resistor this in turn prevents voltage spike during start-up.



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    how to discharge a large capacitor

    The larger value of resistor, the slower the capacitor discharged and vice versa, but with too small value of resistor, the capacitor discharges so fast causes explosion sound (it doesn't mean something bad with capacitor), the proper value is about 100Ohm



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    safely discharge capacitor

    Quote Originally Posted by smiles
    The larger value of resistor, the slower the capacitor discharged and vice versa, but with too small value of resistor, the capacitor discharges so fast causes explosion sound (it doesn't mean something bad with capacitor), the proper value is about 100Ohm
    While most of this is true... the 'right' resistor depends on the capacitor and its charge voltage. Tho, 100 Ohm may be a good 'rule of thumb' - and it may not matter of you destroy the bleed resistor after a few uses. BUT!!! That last use that killed the resistor - *could* kill you too... ??

    The 'safe' thing to do is to calculate one for your situation. The calculation will need to know how fast of discharge is needed (in addition to the capacitors specs). Some can wait an hour, some may need in < 1 second... ??



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