Design of an Integrated Magnetic Structure for Hybrid IPT Charger to Achieve Misalignment Tolerance and Constant Output Current

To address output current fluctuations caused by magnetic coupler mismatches in Inductive Power Transfer (IPT) chargers, a double-D quadrature (Double DDQ) coupler with LCC-S hybrid topology is proposed. This topology combines an LCC compensator (with an inductor and two capacitors) and series capacitors, along with added coupling between primary and secondary circuits. Integrating compensator inductance within the magnetic coupler enhances mismatch tolerance, ensures constant output current, and eliminates extra coils on the PCB, reducing size. This cost-effective approach is ideal for wireless charging of Electric Road Vehicles (ERVs), tolerating coupler mismatches from free movement. The magnetic coupler's performance in ensuring smooth output current under X- and Y-axis misalignments is analysed. A 1-kW prototype validates the design and demonstrates its effectiveness.