I am designing much better ferrite-core high frequency transformers than I can buy. The core is wound with two layers over it's entire magnetic path length, The winding is coherent, i.e.: all parts of all windings have the same lay, and the same lead. I will attempt to measure the time lag between a sudden increase in load current, and the reflected current in the source. Are there parameters of the transformer, that should allow me to predict the delay?
to quantify the delay you got to identify the system parameters of transformer as it will vary with the frequency content in the waveform of current(sudden increase).
Hi Newt,
I think it should be possible, provided you represent the high frequency distributed parameter model for each winding accurately. The well known Bergeron transmission line model can be modified to serve the purpose, though the usual branches of the standard Bergeron form would have to change, (other than the usual distributed series resistance and inductance, and shunt-to-ground capacitance and admittance) primarily to include additionally
- inter-turn capacitance and insulation admittance for all windings,
- winding-to-core capacitance and insulation admittance - particularly for the winding wound immediately on the core.
- winding-to-winding capacitance and insulation admittance - particularly for windings formed one-on-another annularly.
The magnetization inductance and core loss resistance have to be suitably set for the ferrite core that you are using.
Once all this has been done, the time lags and delays can be estimated, and the detailed model can also be simulated on PSPICE or other software.
Hope that helped !
-Sanjay