A fast spotting strategy of optimal frequency in wireless power transfer

One of the most common questions in the Wireless Power Transfer (WPT) system is how to transfer much power over coils driven by the AC power source. This paper concerns how to determine the frequency of AC power source optimal to maximum WPT. Although it is theoretically possible to determine the optimal frequency by wide range frequency sweep, it is practically important to spot it in a few trials of frequency. This paper proposes a frequency spotting strategy using a square wave input power signal. The strategy avoids a long time-consuming sweeping process with knowledge of response by square wave input. The Automatic Multiscale-based Peak Detection (AMPD) algorithm is applied to select the initial peak finding on every data sample increment iteration to further analysis to find the set of peak patterns by calculating error parameters.