Modeling a 6.78 MHz synchronous WPT rectifier with reduced THD

With the growth of magnetic resonance wireless power transfer (WPT), the WPT field sees a push toward higher operating frequencies. New challenges arise as the fundamental frequency increases, namely the relevance of circuit parasitics and the difficulty in preventing harmonic distortion. A 6.78 MHz synchronous rectifier is shown to address the issues of total harmonic distortion (THD) and dynamic loading. This work focuses on further modeling the proposed rectifier, accounting for parasitic conduction losses, THD, input phase control, and characterization of design trade offs. The updated model includes both an exact solution for the complete dynamics of the dead time resonance which, by design, has significant impact on converter harmonics, impedance, and power delivery. The model is compared to the simpler model from previous work and is verified via experimental results.