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From: Pooh Bear on 27 Feb 2006 15:58


Jimbo wrote:

> I was thinking more about noise. How does an inductor do with noise
> versus a capicator?

Noise ?

You're certainly no designer.

This is a *basics* question not design.


Graham


From: Tim Williams on 27 Feb 2006 16:12
"Pooh Bear" <rabbitsfriendsandrelations(a)hotmail.com> wrote in message
news:44036787.D2DFE69E(a)hotmail.com...
> > Using an inductor will give better output voltage regulation versus
> > load current.
>
> Really ?
>
> How about the inductor DC resistance ?

A damn lot better than an equivalent resistor, at any rate.

I wonder how the relations work out for ripple vs. transformer regulation.
Metric shitloads of capacitance don't make transformers happy.

Tim

--
Deep Fryer: a very philosophical monk.
Website: http://webpages.charter.net/dawill/tmoranwms


From: Terry Given on 27 Feb 2006 16:20
Pooh Bear wrote:
>
> Reg Edwards wrote:
>
>
>>Using an inductor will give better output voltage regulation versus
>>load current.
>
>
> Really ?
>
> How about the inductor DC resistance ?
>
> Graham
>

you're an audio guy Graham, go read the Langford-Smith, its all in there :)

an inductor (if > 3%) will also knock the input harmonics down, a lot.

Cheers
Terry
From: Jon on 27 Feb 2006 16:53
Jimbo,
A couple of interesting things happen with an inductor input filter
when the inductance is high enough to ensure continuous inductor
current (This is called the critical inductance).
1) The load regulation improves dramatically.
2) The ripple voltage is independent of load current. (as the load
current increases beyond the critical current, the ripple voltage no
longer increases.
Also, the capacitor peak current is much lower, since the current is
spread out over a larger portion of the power cycle. The power factor
will be larger for the same reason.
Disadvantages:
1) Lower output voltage for a given capacitor value.
2) The inductor must have an air gap to prevent saturation from the DC
current. This means that for a given inductance, the inductor must be
physically large.

From: Terry Given on 27 Feb 2006 23:03
Jon wrote:
> Jimbo,
> A couple of interesting things happen with an inductor input filter
> when the inductance is high enough to ensure continuous inductor
> current (This is called the critical inductance).
> 1) The load regulation improves dramatically.
> 2) The ripple voltage is independent of load current. (as the load
> current increases beyond the critical current, the ripple voltage no
> longer increases.
> Also, the capacitor peak current is much lower, since the current is
> spread out over a larger portion of the power cycle. The power factor
> will be larger for the same reason.
> Disadvantages:
> 1) Lower output voltage for a given capacitor value.
> 2) The inductor must have an air gap to prevent saturation from the DC
> current. This means that for a given inductance, the inductor must be
> physically large.
>

but hey, it can be made from sheet steel - McKenzie Holland used to do
this for big battery chargers!

Cheers
Terry
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