Capacitor question

woody · 15th January 2002, 01:39 AM

If I were to build a power supply using a center taped transformer and a full wave bridge to supply + and - 30vdc
at 5a what would be the minimum ripple current rating needed
for the filter caps?

Thanks

bob12345678 aka Woody I had some trouble logging on!

Keithj · 15th January 2002, 04:23 AM

Here's some formulae...

The ripple current through a capacitor for a full wave rectifier system is:

Ir = Er * 2 * pi * f * C

Where Er is the ripple voltage, f is the frequency in hertz and C is the capacitance in farads.

Calculation of Er is more difficult. You need to know all the source resistances. Better to measure it. If you want the details, and you're able, find a copy of the Radiotron Designer's Handbook and read pages 1177 to 1182.

Good luck, Keith

15th January 2002, 01:39 AM	#1
woody diyAudio Member Join Date: Jan 2002 Location: Tyrone Ga. U.S.A.	Capacitor question If I were to build a power supply using a center taped transformer and a full wave bridge to supply + and - 30vdc at 5a what would be the minimum ripple current rating needed for the filter caps? Thanks bob12345678 aka Woody I had some trouble logging on!

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15th January 2002, 04:23 AM	#2
Keithj diyAudio Member Join Date: May 2001 Location: New Zealand	Here's some formulae... The ripple current through a capacitor for a full wave rectifier system is: Ir = Er * 2 * pi * f * C Where Er is the ripple voltage, f is the frequency in hertz and C is the capacitance in farads. Calculation of Er is more difficult. You need to know all the source resistances. Better to measure it. If you want the details, and you're able, find a copy of the Radiotron Designer's Handbook and read pages 1177 to 1182. Good luck, Keith

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