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How to measure accurancy eff of this circuit?

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noisepic

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I have a bridgre rectifier curcuit able run at 25A. The input is AC 30V, the measure output power is easy P=Vdc*Idc. But input measure by VAc*Iac rms at low current make eff > 100%. Is the problem of power factor?
 

How is it possble eff > 100% ?.
Calculate eff by (Pout/Pin)*100%
 

Hi,

You need a true AC power meter. A good one, because cheap one probably show alot if error when current waveform isn't sine shape.

VAc*Iac rms
Click to expand...
P = V_RMS x I_ RMS x powerfactor
Where powerfactor = cos(phi) for sinusoidal waveform only.

Klaus
 

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