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From: John Larkin on 1 Feb 2010 10:00
On Mon, 1 Feb 2010 02:21:36 -0800 (PST), Myauk
<aungkokothet(a)gmail.com> wrote:

>Hello All,
>
>I am calculating an efficiency of full wave bridge rectifier after
>step-down transformer with a filter capacitor used.
>
>I am looking a circuit as simple as this: http://www.electronics-tutorials.ws/diode/diode23.gif
>
>There, I understand that Pin = Vr.m.s (secondary) x Irms (secondary),

It's not, because the Irms thing is a horrible, non-sinusoidal
waveform. And you'll have losses in the diodes and the filter caps.

If (IF!) you can fully characterize the transformer and capacitor
parasitics, and have a good diode model, you can Spice it to get close
to actual performance. If not, test it with real parts.

When I buy custom transformers, I let the transformer company do the
work!

John

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