I'm experimenting with compensation topologies for inductive WPT systems and have a small confusion. The general WPT industry uses compensation networks to cancel out reactive components in the transmit and reciever side and therefore improve efficiency.
What I noticed is that the industry mostly uses Series-Series or Series-Paralell compensation topology.
I did some experiments and it doesnt add up.
In the pictured we see the frequency response at node north of R1 and C2 (or transformer in non compensated mode).
In Series-Series topology we see that the gain at resonance is around 4 dB, but in Series-non compensated at resonance the gain is 9 dB.
Why is it so?
And if somebody has some literature to share on the topologies, feel free to share!