A Burst-Mode Controlled Inductive Wireless Power Transfer System

This paper presents a burst-mode controlled inductive wireless power transfer system (WPT). Power is transmitted in bursts between transmitter (TX) and receiver (RX). Duty cycle of the burst is controlled through load modulation to control power flow between TX and RX. The proposed WPT circuit can regulate output voltage against distance and load variations. No extra communication channel is present to establish feedback between transmitter and receiver, making the circuit suitable for many applications. A 100-milliwatt prototype circuit for use in medical implant is designed, built and tested.