Re: Toroidal transformer ratings?? What after being rectified?

If you establish boundary conditions that keep the
diode forward biased, then modeling it as linear
is reasonable. Unfortunately operation as a rectifier
necessarily requires that the diode also operate in
its reversed biased region. This makes it a non-linear
device for rectifier applications, with all the
resulting complications in modeling.

Steve Stallings
www.pmdx.com


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Polaraligned"
<polaraligned@o...> wrote:

>
>
> > >
> > This is basically totally wrong.
> > An ideal diode is modeled as a step function - 0 below the

breakdown

> > voltage, 1 above that value (or the other way around if you're

looking

> > at "effective resistance"). That is a non-linear function.
> >
> > Beyond the breakdown region, the current increases exponentially
> > relative to voltage. This is also a non-linear function. You

can get

> > close to a linear approximation if you use an infinite slope -

ie, a

> > vertical line on a current vs voltage graph.
> >
> > - Steve
>
> Take a look at a plot of diode current vs diode voltage. It is a
> straight, slightly sloping line after breakdown. A straight line
> is linear. There is no curve to the line. This line could be

plotted

> with a first order equation. That by definition makes it linear.
>
> Scott