Frequency Drift Reduction through Alternating Magnetic Field between Coupled Resonators in Power Transfer Systems

In order to reduce the impact of frequency drift, a new technique taking advantage of the strong alternating magnetic field between strongly coupled resonators in power transfer systems is proposed. Through these resonators with high quality factors, highly efficient power transmission is achievable. This paper focuses on exploiting the oscillator state information hidden in mutual strong alternating magnetic field for power transfer to reduce the cost for communication devices and acquire higher robustness against frequency drift. Comparison is made between our system and the typical phase shift-keying (PSK) systems with phase-locked loop and pilots in terms of bit error rate (BER). Simulation results illustrate lower BER and higher stability can be achieved by the proposed systems, especially when the frequencies of oscillators are unstable due to ambient temperature fluctuation.