Fundamental Investigation of Short-Range Inductive Coupling Wireless Power Transmission by Using Series-Series Capacitive Compensation Topology

A Wireless Power Transfer (WPT) Systems was developed applying the concept of resonance theory. This paper is dedicated to a theoretical study of the series-series capacitive compensation topology, then devoted to the experimental implementation of this study to prove its validity. The experiments are set up to operate in 10-20 kHz frequency ranges at distances of 50 mm by using windings made of Litz wires to test the analytical design consideration. The results showed that the system's efficiency increased until reaching its peak at 80 % with a resonance of 20 kHz. The efficiency increases in accordance with resonance frequency. Although the theoretically calculated efficiency with an ideal transformer is 90.1 %, the actual efficiency obtained from the experiments in the laboratory at a coil distance of 50 mm and with a resonance frequency matching at 20 kHz is 80 %.