At 07:01 PM 7/2/01 -0500, michael brown wrote:
> > >
> > >Seriously, could this "pulsed DC" load on the line really cause any ill
> > >effects with other equipment?
> >
> > Only in extreme cases, and I'm not sure you would notice.
> >
> > >  I have never heard of this and am extremely
> > >curious.  What about equipment that, say, contains a bridge rectifier for
> > >example with no isolation transformer?
> >
> > Draws current on both halves, that's what bridges are for!
>
>I know that, but I 'ass-u-me'd that a full wave rectifier was used just
>because it gave a smother dc supply, that was easier to filter, not that it
>was there to present a "balanced" load to the line.  Plus it makes more
>"power" available at a higher voltage.

Full wave is relevant to a center tapped transformer, and only uses half
the windings at a time.
Bridge works without the center tap, and uses all the windings all the time.
In a bridge, you dissipate for two diode drops in series, in a full wave,
only one.
Otherwise they are the same.



> > >Would there be a difference between full wave and
> > >half wave rectifiers?
> >
> > Yes, half wave draws current during half the wave.
> > Full wave draws current during the full wave..
>
>Not exactly what I was looking for there.

That is the only difference that I'm aware of.


>OK.  I am trying to imagine the flow of the DC current within the big
>picture involving the "offending" light bulb, a neutral and a hot wire.
>What "unwanted" effect on the AC mains is obtained from the diode inline
>with the bulb?  I hope I have been specific enough here.

None.. The pole transformer sees more load on one half of the cycle than
the other.
If EVERYBODY used diodes on EVERYTHING, and they were ALL installed the
same way, it would likely be a problem.  Odds of happening, near zero.


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