Electronic – Rectifier ripple voltage formula


So I thought the ripple voltage was approximated by the formula

Vr,pp = Vp / fRC

for a half-wave rectifier, and Vp/2fRC for a full-wave.

Yet simulation shows about 55% of this value.

So is the formula wrong? Just very inaccurate? Or under what conditions is it otherwise more accurate?

enter image description here

Best Answer

There is a mass of online help to aid calculating this. This one at Hyperphysics is particularly complete with a calculator provided.

enter image description here