Re: [TCML] Solid state efficiency, was: mini Tesla coil specs

[Frosty <frosty90@xxxxxxxxx>]

Hi
The trianglular current is the current through the leakage inductance of the
primary. When you apply a square wave voltage to a n inductor you'll get the
triangular wave form, at pi/2 out of phase with the applied voltage. I
suppose the gradual change to sine wave is due to enegry being transfered to
the secondary during 'ringup', which of course looks like a RLC resonant
circuit, which will have a sinusiodal shape. With an untuned primary the
triangular 'magnetising' curent componenet will always still be there I
think.

Cheers,
Jesse

On Mon, Nov 16, 2009 at 7:49 AM, Ken or Doris Herrick <kchdlh@xxxxxxxxx>wrote:

> From KCH-
>
> While I have the attention of a few s.s.'ers here, perhaps someone can shed
> light on this:  I'm simulating what amounts to a half-bridge driving an
> untuned-primary t.c.  I record waveforms of a) MOSFET current and b) primary
> current.  I notice the following: At the start, the MOSFETs switch at
> current peaks and the current waveform is triangular.  As the primary
> current--and secondary voltage, of course--builds up, the current waveform
> gradually changes toward a sine shape and the switching events shift toward
> current-zero-crossing.  I have a feeling that that's the case in the real
> world.  Is that to be expected?
>
> KCH
>
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