Study on the Principle of Contactless Electric Power Transfer via Electromagnetic Coupling

摘要

In recent years, contactless transfer of electric power has received worldwide attention. Among many contactless electric power transmission systems, an electromagnetic resonant system showed a remarkable ability to turn on a 60-watt light bulb located at a distance of 2 meters from a power source. Several papers that explain principles of the system have been published, but no analytical explanation of these principles has been provided. In this paper, the author provides an analytical explanation of the principle underlying the power transfer system. The analysis can facilitate the evaluation of the system characteristics, such as resonant frequencies, transferable power, efficiency, coil voltages, etc., and may be useful in the synthesis of contactless power transfer systems.