Single-Stage Regulated Resonant WPT Receiver with Low Input Harmonic Distortion

TL;DR

This paper presents a novel single-stage wireless power transfer receiver with low harmonic distortion, capable of effective DC regulation through a differential resonant rectifier topology and phase shift control.

Contribution

The paper introduces a differential resonant rectifier topology that enables single-stage AC rectification and DC regulation with low harmonic distortion in WPT systems.

Findings

Achieves low harmonic distortion in AC output voltage

Demonstrates effective DC regulation in a single-stage system

Maintains ZVS operation over a wide range

Abstract

Resonant rectifier topologies would be a promising candidate for achieving simple, compact, and reliable single-stage wireless power transfer (WPT) receiver if not for the lack of good DC regulation capability. This paper investigates the problems that prevent the feasibility of single-stage DC regulation in resonant rectifier topologies. A possible solution is the proposed differential resonant rectifier topology, of which the rectifier is designed to have a relatively constant AC voltage, and that phase shift control is used to achieve relatively good output regulation. Design considerations on the reactive component sizing, magnetic component design, frequency and phase synchronization, small signal modelling, and closed-loop feedback control design, are discussed. Experimental results verified that the proposed WPT receiver system can achieve single-stage AC rectification and DC regulation while attaining the key features of low harmonic distortion in its AC output voltage, continuous DC current, and zero-voltage-switching (ZVS) operation over a wide operating range.