transformer schematic

[franticEB]

Hi to all and merry xmas!!!

I'm studying the circuit in figure below



and i don't understand how it's work from a theoretical point of view when switch S1 is open or closed.

I've made some simulations and i've noticed that the square wave on the output is amplified if S1 is on. That's true?

Could you give me some help in understanding? Thanks

 

[andre_luis]

Probably L-C values were selected to be resonant at switching frequency, performing an additive effect on output.


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[FvM]

The question can't be answered without giving the transformer data.

 

[franticEB]

toroidal transformer (VITROVAC 6025 Z core) with Nprimary=30 turns Nsecondary=30turns and Nthird=10turns

 

[andre_luis]

The P/N you gave refers to a family group, in which there are several core sizes.



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[Borber]

Just a suggestion. The role of secondary winding and switch S1 can be a shifting of core magnetizing curve. When S1 is closed the DC current through secondary shifts curve toward more linear part out of saturation.
Look at dots on windings.

 

[crutschow]

The top circuit generates a magnetizing current in opposition to the current from the bottom circuit. This prevents the core from saturating due to the the bottom circuit pulsed DC current and allows the signal from the bottom to be transmitted through the transformer. So switching the top winding would appear to have the effect of turning the output signal on and off. But that's just a guess. :???: