Abstract: A double-sided LCC compensation network and a tuning method are proposed for a wireless power transfer system. With the proposed topology, the resonant frequency is independent of coupling coefficient and load conditions. The parameter values are tuned to realize zero voltage switching (ZVS) for the sending side switches. A wireless charging system with up to 7.7 kW output power was designed and built using the proposed topology and achieved 96% efficiency from DC power source to battery load.

Abstract: A wireless power transmission system is provided for high power applications. The power transmission system is comprised generally of a charging unit configured to generate an alternating electromagnetic field and a receive unit configured to receive the alternating electromagnetic field from the charging unit. The charging unit includes a power source; an input rectifier; an inverter; and a transmit coil. The transmit coil has a spirangle arrangement segmented into n coil segments with capacitors interconnecting adjacent coil segments. The receive unit includes a receive coil and an output rectifier. The receive coil also has a spirangle arrangement segmented into m coil segments with capacitors interconnecting adjacent coil segments.