Hi Sam, One comment I would make about your different equivalent models - I agree with your comment about them all being equivalent if you apply the appropriate transformations. I have designed several integrated magnetic devices using custom cores that allow a flux shunt to be inserted between the primary and secondary windings. Based on these designs they do end up being somewhat asymmetric and I can implement the leakage inductance so that it is associated with one particular winding - resulting in the bulk of the leakage associated with one winding and a much lesser amount with the other. This does make a difference for the solution as to whether you run the leakage on the primary or secondary from a basis that the volt-seconds applied across the transformer can be different depending on which side you place the leakage. From a simulation model you are correct that you can work out equivalent transformations between the primary leakage and secondary leakage design. That being said from a practical designe perspective it can be beneficial to use one of the designs over the other on the basis of lowering the applied volt-seconds across the transformer. This is a very unique case however as this difference only comes about from the unique core geometries that I have developed. Virtually all LLC designs that I have come across based on industry standard core designs will end up creating symetrical designs - I.E., the leakage ends up being distributed evenly between the primary and secondary windings.

Thank you! I have a suggestion for new contribution on this channel: Induktive cooker and the typical schematics of these devices. I disassembled some weeks ago one of this. I found inside just 2 power electronics parts: a diode bridge and a 600 V MOSFET. The coil has a parallel capacitor comprising a resonance circuit. It's a miracle for me, how a single MOSFET is able to control the power transfer into the cooking pot. At list I would expect a MOSFETs half bridge.

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Nice Video professor. Interesting, I use the same method!

Hi Professor, this is also a topic I am working on recently. THanks for your explanation. However, I have tried these four modeling methods in LTSPICE and seen that the two L-models give different results as other two. I have double checked and made sure the parameters as the same as yours. Additionally, all models give like twice higher than your results at 7:42. How come is this? BTW, all your schematics at 3:38 missed Cr.

Great video as always, thanks Sam By the way, isn't the diode bridge rotated in the schematic at 1:46?

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I see you do in ltspice sim the leakage and use K1 L* L* 0.85? . Now I see how you did it, thanks,