Calculating capacitor values for a smoothed power supply - basics

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u235

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Rload*C  >>  1  /  f

Where:
Rload = resistance of the load for the supply
C = value of capacitor in Farads
f = ripple frequency - twice the line frequency for a full wave rectifier .


Example:
Load resistance of 2 ohms
50Hz supply full wave rectification

Calculating: 2C in farads must be greater than 1/100
therefore 2c in microfarads must be > 10000
Therefore C must exceed 5000 microfarads.
 
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