This paper presents the design of a 5kW inductive charging system for electric vehicles (EVs). Over 90% efficiency is maintained from grid to battery across a wide range of coupling conditions at full load. Experimental measurements show that the magnetic field strength meets the stringent International Commission on Non-Ionizing Radiation Protection (ICNIRP) guidelines for human safety. In addition, a new dual side control scheme is proposed to optimize system level efficiency. Experimental validation showed that a 7% efficiency increase and 25% loss reduction under light load conditions is achievable. The authors believe this paper is the first to show such high measured efficiencies for a level 2 inductive charging system. Performance of this order would indicate that inductive charging systems are reasonably energy efficient when compared to the efficiency of plug-in charging systems.

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This paper proposes roadway electrification to facilitate wireless charging to accomplish two purposes. The system allows electric vehicles (EVs) traveling on an electrified lane to receive a charge update. It also permits charging of a lowprofile autonomous emergency assist vehicle. Several vehicles of this type would be stationed along a congested roadway allowing an automated and quick response to clear incident situations such as roadway debris, abandoned or disabled vehicles, and minor accidents. It is anticipated that by accomplishing both EV charging and incident response, the system can help to reduce important problems of incident delay, injury and deaths to emergency response personnel, and petroleum related emissions. A case study using data from Washington's State Route 520 indicates that the system can potentially save up to 50% of the induced delay due to incidents. The concept of operations for the system is described in the paper and aspects of technology readiness are explored.