Time Domain Analysis of WPT System with Parallel Resonant Secondary Stage Driving Rectifier Load

The secondary stage of a wireless power transfer (WPT) system with a $L_{2} C_{2}$ parallel-resonant circuit driving a rectifier load is analyzed in the time domain. The resonant capacitor $C_{2}$ may swing freely (swinging mode) or be charged to the steady-state output voltage value $V_{o}$ and capped at $\pm V_{o}$ (bounded mode). Analytic results are derived and confirmed by SPICE simulation and measurement results. Results are organized as normalized parameters to help in design.

I. Introduction

Wireless power transfer (WPT) can be used for charging mobile phones and supplying power to implantable medical devices (IMDs). Cases with the series resonant primary stage driven by a primary source , and the series / parallel resonant secondary stage driving a resistive load are analysed in [1, 2]. Earlier attempts to analyze cases with rectifier load are [3–8], and a detailed time-domain analysis of the series resonant secondary driving a rectifier load is shown in [9]. In this research, time-domain analysis of the parallel resonant secondary driving a rectifier load is discussed, but first, let us review the case with resistive load.