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capacitor value after rectifier

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innovation1

Newbie level 6
capacitor

hi.......... can u tell me how to decide capacitor val that is to be connected after rectifier stage.........

Re: capacitor

The load current causes ripple. A higher value capacitor smooths the ripple which reduces its p-p level.
I use a graph like this one:

Re: capacitor

thanx for reply...... but i connected a 1000uF capacitor across a rectifier (with 18V 50 Hz i/p) it gave o/p (across capacitor) of 22-20V. is it bcoz of charging of the capacitor........???????

The AC voltage is 18V RMS which has a peak voltage of 25.5V. Then the rectifier reduces it to 23.5V. The ripple from the capacitor with a small size reduces the voltage more.

innovation1

Points: 2
thanx for reply .. bt the graph u hav posted is for fr=120hz.....
my i/p is 50hz i.e. fr=100hz????
so i just want to know the generalised relation to find value of C

The formula is on my graph but it is wrong.
Since 50Hz is 0.833 times 60Hz then the amount of ripple is 1.2 times more than my graph.

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