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Registered Member #1895
Joined: Thu Jan 01 2009, 03:12AM
Location:
Posts: 22
I have a stepped up 1500 VAC output. I have the circuit on a bridge diode however, I'm having trouble finding the right capacitor to smooth the current wave.
Is there a formula that I can use to find the appropriate capacitance and voltage to smooth the output?
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
You need to know what the load is as well. The load and filter capacitor have an RC time constant, and depending on the desired ripple which is better expressed as a percent of the supply voltage, you can find the maximum time between filter "charges" aka the frequency of your AC source. This is backwards from what you want of course, you'll need to look up the formula and rearrange it yourself. First find the discharge %, then with the frequency you find the time constant, and finally determine the size of C required with a given R to get the discharge % desired.
EDIT: Beat by two posts! Billybobjoe's method is much simpler.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
A rough rule which usually produces good results is that a minimum of 10,000uF per amp will smooth a 50Hz supply sufficiently for most practical purposes.
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Power Supply Smoothing
