The capacitive power transfer (CPT) system and inductively power transfer (IPT) system are the two typical wireless power transfer systems. Based on the power transfer characteristics, the power transfer capacity of the two wireless power transfer systems were analyzed. Firstly, the maximum power transfer capacity and its existing condition of the two wireless power transfer systems were analyzed, and the choose gist of wireless power transfer system was presented according to the analysis

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... t; then, the mutual inductance of 4 typical IPT systems was optimized for achieving maximum power transfer; finally, the theoretical research was justified via a simulation and experiment. Index Terms-capacitive power transfer (CPT), inductively power transfer (IPT); mutual inductance; optimization.