Single-Switch-Regulated Resonant WPT Receiver

TL;DR

This paper introduces a low-cost, reliable single-switch wireless power transfer receiver that simplifies design, reduces components, and maintains efficient power pickup through resonant rectification and zero-voltage switching.

Contribution

It presents a novel single-switch resonant rectifier design for wireless power transfer, enhancing simplicity, reliability, and cost-effectiveness.

Findings

Prototype verifies effective power transfer with single-switch design.

Resonant rectifier achieves ZVS for improved efficiency.

System reduces component count and cost.

Abstract

A single-switch-regulated wireless power transfer (WPT) receiver is presented in this letter. Aiming at low-cost applications, the system involves only a single-switch class-E resonant rectifier, a frequency synchronization circuit, and a microcontroller. The number of power semiconductor devices required in this circuit is minimal. Only one active switch is used and no diode is required. As a single-switch solution, this simplifies circuit implementation, improves reliability, and lowers hardware cost. The single-switch resonant rectifier provides a relatively constant quasi-sinusoidal voltage waveform to pick up the wireless power from the receiver coil. Due to the resonant nature of the rectifier, ZVS turn on and turn off are achieved. The steady-state analysis and discussions on the component sizing and the control design are provided. A prototype is built and experimental works are performed to verify the features.