Ripple current ?

woody · 12th January 2009, 04:33 PM

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.

12th January 2009, 04:33 PM	#1
woody diyAudio Member Join Date: Jan 2002 Location: Tyrone Ga. U.S.A.	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.

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12th January 2009, 05:57 PM	#2
wg_ski diyAudio Member Join Date: Oct 2007	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.

12th January 2009, 10:09 PM	#3
woody diyAudio Member Join Date: Jan 2002 Location: Tyrone Ga. U.S.A.	Thanks ! that was what I was after just a general idea.

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