Re: Some transformer theory

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Antonio Carlos M. de Queiroz by way of Terry Fritz <teslalist-at-qwest-dot-net>" <acmq-at-compuland-dot-com.br>

Tesla list wrote:
 >
 > Original poster: "Bunnykiller by way of Terry Fritz 
<teslalist-at-qwest-dot-net>" <bunikllr-at-bellsouth-dot-net>

 > normally flyback transformers are made with a ferrite core...   they do
 > behave differently. One of the "neet" things about a flyback ( or a ferrite
 > cored Xfmr) is that they can be driven to a resonate state.  You can apply
 > a voltage to them over a broad range and then all of a sudden you will see
 > a tremendous peak in voltage on the secondary....

What you see is the resonance of the secondary winding with its own
parasitic capacitance. Exactly the same that happens in a Tesla
transformer. Add a load capacitance to the secondary to see how
the resonance frequency is decreased.
The ferrite core introduces some nonlinearity, but this doesn't
affect the basic behavior, that is of a conventional transformer,
with two inductances and mutual coupling (quite high due to the
core), resistances in series with the windings, and loaded with
a "self-capacitance" and capacitances of the wiring and instruments
that you connect to the secondary coil.

Antonio Carlos M. de Queiroz