A Magnetic Switch Sensor Based Inductive Power Transfer System With Power Control and Efficiency Maximization for Vehicular Applications

In order to establish an efficient inductive power transfer (IPT) mechanism for electric vehicles (EVs) it is necessary that a system with effective power control and efficiency maximization is established. As the equivalent resistance of the on-board battery charger continuously fluctuates during operation, a battery charging algorithm based on an improvised continuous current (CC)–constant voltage (CV) is proposed. This article introduces the design of an integrated stationary IPT system to inductively transfer power from a transmitter pad positioned on the ground and the receiver pad embedded under the chassis of an EV. An innovative feature of the design is the implementation of a magnetic switch sensor that is incorporated into both the transmitting and receiving wireless charging circuitry to ensure optimum alignment for IPT. The power electronics design focuses on the implementation of an H-bridge converter incorporating series–series (SS) compensation topology to use an innovative control algorithm to prioritize battery charging operations. The system is validated through a simulation model in PSIM and a hardware-in-the-loop (HIL) simulation in Typhoon before hardware implementation and testing of the developed prototype. At a test resonant frequency of 23.74 kHz and a nominal air gap separation of 120 mm, the developed IPT system had an overall efficiency of 93.41%.