Electronics > Beginners
Window comparator as perfect rectifyer?
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FriedMule:
Imagine some standard run of the mill rectifier circuit with maybe 1V ripple, connect it to a zero droop window comparetor and last connect it to an opamp.
Let the opamp get power from the standard rectifier.
Would the opamp not try to keep it's output exactly as the comparetor's linear signal?
Benta:
I'm not certain you really mean "window comparator".
Make a sketch of what you want, please.
wraper:
Go google about synchronous rectification if meaning high efficiency power rectification or precision rectifier if you need a signal itself.
https://en.wikipedia.org/wiki/Active_rectification
https://en.wikipedia.org/wiki/Precision_rectifier
As of what you described is weird. And comparator has only 2 states on it's output, what linear signal?  :-//
FriedMule:

--- Quote from: Benta on May 26, 2019, 06:30:54 pm ---I'm not certain you really mean "window comparator".
Make a sketch of what you want, please.

--- End quote ---
What i mean is a circuit that detects highest positive voltage that the rectyfier is delivering, I do not know how to draw it but I'll try to explain again:-)
if you have that "max volt detector" and put the result into an opamp, the opamp will try it's best to deliver that as output.
My thought was that the end result will be an opamp that keep fighting to maintain the same max value.
--- Quote from: wraper on May 26, 2019, 06:41:44 pm ---Go google about synchronous rectification if meaning high efficiency power rectification or precision rectifier if you need a signal itself.
https://en.wikipedia.org/wiki/Active_rectification
https://en.wikipedia.org/wiki/Precision_rectifier
As of what you described is weird. And comparator has only 2 states on it's output, what linear signal?  :-//

--- End quote ---
Great links, it looks like what I am thinking of!
Am I wronh in thinking that this circuit: https://upload.wikimedia.org/wikipedia/commons/c/ca/Op-Amp_Precision_Rectifier_%28Improved%29.svg
only is a half-bridge rectifier?
And combined with the comparator, it gets to be a full bridge rectifier?

Hmm does it not loose a lot power in that configuration?
wraper:
Peak detector is not a comparator. Also it does not help at rectifying in any way.
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