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woody 12th January 2009 04:33 PM

Ripple current ?
I am about to build a power supply supplying 32 @ 4A using a full
wave bridge @ 60hz how do I figure the minimum ripple current
rating I need for the capacitor. I am hopeing for an EASY way to
calculate this. And I did search but didn't find an EASY way to calculate this.

wg_ski 12th January 2009 05:57 PM

There is no easy way to calculate it - rigorous analysis requires that you know the secondary-referred leakage inductance of the trafo and treat it as an LC filter. Rule of thumb is 60% of the DC load current. It's the same ROT that dictates the amp rating of the trafo to be 1.6X the DC load for a cap input FWB. It's not really quite that high because RMS is higher than average, but it's a start.

woody 12th January 2009 10:09 PM

Thanks ! that was what I was after just a general idea.

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