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Author Topic: Value of a leveling cap on the backside of a full wave bridge?  (Read 5742 times)

rukiddingme

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How do you determine the best value of a leveling cap on the backside of a full wave bridge?


In this case, 12 volts 1.5 amps DC.

MarkE

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Re: Value of a leveling cap on the backside of a full wave bridge?
« Reply #1 on: June 25, 2014, 06:22:19 AM »
The usual method is to determine the acceptable voltage droop, half cycle to half cycle.

The droop is approximately: VDROOP ~= ILOAD/(C*2*F)

The shortcut is: 8,333uF*Volts / Amp at 60Hz, or 10,000uF*Volts / Amp at 50Hz.

At 1.5A you need 12,500uF for 1V droop, 6,250 if you can tolerate 2V droop, 3,125uF if you can tolerate 4V droop etc.


rukiddingme

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Re: Value of a leveling cap on the backside of a full wave bridge?
« Reply #2 on: June 25, 2014, 07:21:44 AM »
Thanks