Near field, full duplex data link for use in static and dynamic resonant induction wireless charging

Abstract

A full duplex, low latency, near field data link controls a resonant induction, wireless power transfer system used for recharging electric vehicles and other electrically powered devices. A coherent transponder configuration enables low complexity synchronous detection and positive rejection of signals originating from nearby and adjacent vehicles. A reference crystal oscillator in the ground side apparatus provides frequency synchronization for both the forward and the return data links. Transmission is by means of near field magnetic induction between pairs of loop antennas which, together with the effective waveguide below cutoff structure comprised by the vehicle underbody and the ground surface, largely restrict signal propagation to the area in the immediate vicinity of the system antennas.

What is claimed: 
     
         1 . A full duplex data communication system employing near field inductive transmission, comprising:
 a first transmit/receive system that transmits a first signal over a first inductive link and receives a second signal over a second inductive link; and   a second transmit/receive system that receives the first signal over the first inductive link and transmits the second signal over the second inductive link,   wherein said first and second signals have an integer harmonic relationship with each other, where the integer is not equal to 1.