Design and Analysis of a Modified Dual Phase Shift Control Method for a Wireless EV Charger Considering Coupling Uncertainty

Abstract

Wireless chargers emerged as effective means for increasing the safety and reliability of EV charging systems. Wireless charging of an EV based on a dual active bridge is studied here. It is shown that the conventional dual phase shift (DPS) control method imposes high stresses on system components, especially when the coupling coefficient is unknown. Such voltage and current stresses decrease the lifetime of power switches. Then, a novel DPS method is proposed which is able to control the output power while limiting the stress on components. The proposed method is investigated using MATLAB Simulink. It is proved that the proposed controller guarantees the proper operation of the system for coupling coefficients between 5% and 35%.