Self-tuning capacitance for impedance matching in wireless power transfer devices

Abstract

The efficiency of tunable wireless power transfer between two antennas with a low-cost embedded circuit is investigated. The system operates in the strong coupling regime and, therefore, within the near field region. The efficiency was numerically calculated by varying the distance between the transmitter/receiver system, and analyzing by the Maximum Power Point Tracking (MPPT) algorithm. The maximum increase of efficiency achieved was 27.39% at a distance of 30 cm and 154.16% at a distance of 1 meter.