An Iterative Design Approach for Shielding of WPT Systems in Electric Vehicle Charging Applications

Several factors are considered when designing a Wireless Power Transfer (WPT) system for Electric Vehicle (EV) charging. These include the efficiency of the system, amount of power transferred, near field emissions, cost, and weight. Reaching the best combination of design parameters often requires trade-offs between them. Accordingly, and starting from a given coil design, this paper proposes an iterative shield design approach for selecting an adequate aluminum shield radius and thickness, using Finite Elements (FE) Analysis, which ensures a safe level of EMC near field exposure, minimal cost, and minimal weight. Design considerations were done considering the 85 KHz frequency level set by SAE-J2954 TF.