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Need capacitor for smoothing 
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#1
Apr2010, 10:35 AM

P: 43

Need capacitor for smoothing?
hello friends if i have 6 volt peak fullwave rippled output wave form comes from fullwave rectifier. the what rating capacitor (in faraday) i connected with it to make it smooth dc wave. thanks a lot frequency is 50hz and 220volt input and out from rectifier and my load demands taking current about some mAmp 


#2
Apr2010, 10:54 AM

P: 1,803

There always will be some ripple. You need to define how much ripple you can tolerate. The amount of ripple will also increase with the load current so you also need to define the maximum load current for the ripple specification.



#3
Apr2010, 08:00 PM

Sci Advisor
P: 4,016

As an example, with your supply and a 150 ohm load (40 mA), and a 1000 uF capacitor, the ripple would be about 0.8 volts pp.
You could use a larger capacitor, but the charging current for a bigger capacitor quickly gets very large. Even a 1000 uF capacitor needs about 500 mA charging pulses to charge it. It is usually better to use a voltage regulator, but you would need at least about 9 volts from the power supply to get 6 volts out and this would have to be filtered. However, the output of a voltage regulator can be almost perfect DC with only slight ripple and noise visible on an oscilloscope. 


#4
Apr2110, 04:54 PM

P: 1,803

Need capacitor for smoothing



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