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From: | |
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Date: | Fri, 20 Dec 1996 11:54:29 -0500 |
Content-Type: | text/plain |
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Dave,
A rectifier is a device used in a circuit to get as
close to a DC voltage output (battery) as possible.
It takes as an input an alternating voltage wave
(excuse the drawing) as from your wall outlet...
Input
Peak positive voltage
+Pv
_____
/ \
/ \
/ \
-------------------------
\ /
\ /
\_____/
-Pv
Peak negative voltage
and converts this waveform to an output
of positive cycles or negative cycles, such as
Output
Peak positive voltage
+Pv
_____ _____
/ \ / \
/ \ / \
/ \ / \
-------------------------
or
Peak negative voltage
-Pv
-------------------------
\ / \ /
\ / \ /
\_____/ \_____/
After the output of the rectifier, some
circuitry is used to smooth these big
bumps out into smaller (ideally none)
bumps.
Into something like the following for
positive rectification...
Peak positive voltage
+Pv
_____ _____ ______ __Pv max
/ - _/ - _/ - _ __Pv min
/
/
-----------------------------------
The "ripple" is basically the voltage min and max
of the new waveform, Pv min and Pv max respectfully.
It is dependent upon the components used
for waveform smoothing.
If the ripple is too large, this could have
an effect very different than if a pure dc battery
was used, i.e. no ripple.
This has been an extremely brief explanation and
I expect to get royally flamed. But, I tried
not to get too technical.
ddhillma wrote:
>
> Hi TechNet -
>
> This sounds dumb but what is a rectifier (what's its function in an
> electrical circuit?). They did teach us that in metallurgy class!
>
> Dave Hillman
> Rockwell Collins
> [log in to unmask]
>
>
> ______________________________ Reply Separator _________________________________
> Subject: GEN: Rectifiers
> Author: [log in to unmask] at ccmgw1
> Date: 12/20/96 8:17 AM
>
> Is it true that rectifiers generate a constant minimum AC voltage (rms)
> that causes variable ripple depending on actual or overall voltage? In
> explanation, is ripple defined by the minimum AC voltage over the rated
> output voltage only?
>
> Could the group enlighten me on the subject of minimizing ripple and how
> it affects plating? There's been much discussion about copper plating,
> and I would appreciate some information on this topic.
>
> Chemist, IUP, CU
>
> P.G. Wilson
> [log in to unmask]
>
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