Design and Control of a New Single-Stage Wireless Charger with Interoperable Power Level Capability

In inductive power transfer (IPT)-based wireless charging systems, the same transmitter cannot charge the electric vehicle (EV) at different power levels due to the bifurcation phenomenon. Consequently, IPT chargers with different power ratings are needed, which increases the infrastructural cost. This paper presents a new interoperable single-stage IPT charger for multi-power level wireless charging, comprised of an active clamped AC-AC high-frequency converter and a reconfigurable transmitter-based IPT coupler with switched series-series compensation circuit. The proposed coupler consists of a tapping-based circular-shaped coil on the transmitter side and a hexagonal-shaped coil on the receiver side. The proposed IPT coil is designed to charge the battery packs at level-1/level-2 power levels with a bifurcation-free phenomenon using the analytical approach, and its performance is evaluated in the ANSYS-Maxwell software platform. The proposed single-stage multi-power level IPT charger is validated through MATLAB simulations under different power levels and operating conditions.