Exploration of The Non – Commensurate Performance Objectives of Bi – Directional Vehicle to Grid Resonant Converter Based Battery Charger

In bidirectional Wireless power transfer (BDWPT) for electric vehicle battery chargers, aside improving efficiency, the effects of stray magnetic field on users and the general public is also of concern. Hence, the stray magnetic field and power loss are key performance indicators to be optimized. The optimization, reported in literature, is obtained with Pareto front which is derived by sweeping the physical parameters of the coil. This optimization is realized at the design stage. This work explores the optimization of these performance indicators from the control point of view and can be achieved on-line. The method discussed here involves the control of the duty cycle and displacement angles of the inverter and rectifier voltages to meet the objective of reducing the stray field and power losses. To this end, the classical Lagrange optimization procedure is employed to simultaneously minimize the stray magnetic field and power loss for a given output power condition.