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Old 02-10-2011, 12:04 AM   #6 (permalink)
gone-ot walking...
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Originally Posted by ddunk80 View Post
...the original post (OP) is asking about how to "filter/smooth" AC-voltage into pure DC-voltage.

...there are three ways to do it: (1) capacitor (RC) filter, (2) inductor (RL) filter, and (3) combined capacitor/inductor (RLC) filter.

...capacitor filters can charge to peak voltage, but can't "hold" that voltage.

...inductive filters can provide a steady current, but can't "hold" that current for ever.

...combined RLC filter optimizes the two above and provides the best compromise DC-voltage, but there will always be a small amount of residual AC-"ripple."
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