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Thread: Capacitor

  1. #1 Capacitor 
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    I have a capacitor that is rated for 150VDC. Can I use this capacitor in a bridge rectifier circuit, with 117V AC input. Does it have to have a higher voltage rating or is 150V DC ok. The cap will be a smoothing cap to get a steady DC from the full wave rectified AC.


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  3. #2  
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    If it is going to be used as a filter(smoothing), base the voltage rating on the Vout and not the Vin of the rectifier.

    The voltage rating must be higher than the actual voltage that will be applied to it.
    There is a rule of thumb or probably a standard on how many percent should the rating be higher than the actual applied voltage.


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  4. #3  
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    This web site
    http://www.hans-egebo.dk/Tutorial/el...capacitors.htm
    recommends taking the nominal a-c voltage, multiplying by the square root of 2 to get the peak voltage out of the rectifier, then adding 10 percent to account for supply voltage variation. In your case this would be 182 volts, so your 150 volt rating wouldn't be enough.
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  5. #4 Capacitor 
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    I have a capacitor that is rated for 150VDC. Can I use this capacitor in a bridge rectifier circuit, with 117V AC input. Does it have to have a higher voltage rating or is 150V DC ok. The cap will be a smoothing cap to get a steady DC from the full wave rectified AC.[/quote]

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