Enhanced Static and Dynamic Modeling of a Series-Series Inductive Power Transfer System with a Buck Post-Regulator

This paper discusses enhanced static and dynamic modeling of a series-series compensated Inductive Power Transfer System (IPTS) using a Buck converter as a post-regulator. A First Harmonic Approximation (FHA) method is adopted to develop a static model of the analyzed Post-Regulated IPTS (PR-IPTS), highlighting operating regions in which a Buck post-regulator may exhibit controllability issues. Dynamic modeling of the proposed PR-IPTS is then performed by exploiting previous works based on a Coupled-Mode Theory (CMT). Their findings are herein extended to include a phase-shift modulation of the primary full-bridge inverter operating at whatever switching frequency. Experimental tests performed on a laboratory prototype confirm good output voltage regulation capabilities in both static and dynamic load conditions.