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capacitor value after rectifier
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innovation1



Joined: 13 Mar 2009
Posts: 13
Post30 Oct 2009 15:11   

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



Joined: 19 Jan 2008
Posts: 1147
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Location: Toronto area of Canada
Post30 Oct 2009 15:29   

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:
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innovation1



Joined: 13 Mar 2009
Posts: 13
Post31 Oct 2009 7:30   

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........???????
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Audioguru



Joined: 19 Jan 2008
Posts: 1147
Helped: 95
Location: Toronto area of Canada
Post02 Nov 2009 18:29   

Re: capacitor value after rectifier
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.
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innovation1



Joined: 13 Mar 2009
Posts: 13
Post03 Nov 2009 15:02   

Re: capacitor value after rectifier
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
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Audioguru



Joined: 19 Jan 2008
Posts: 1147
Helped: 95
Location: Toronto area of Canada
Post03 Nov 2009 17:43   

capacitor value after rectifier
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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