Magnetic Energy Minimization for Suppressing Magnetic Field Intensity of Inductive Power-Transfer Systems

This study solves the magnetic energy minimization problem in inductive power-transfer systems to suppress the magnetic field intensity and formulate the lowest boundary of the magnetic energy. The theoretical analysis shows that the minimum value of the magnetic energy is a function only of the coupling coefficient, quality factor of a receiver, and transmitting power and it converges to 0 under the condition that the coils and their coupling are ideal. The electromagnetic simulations verify the suppression effects of the magnetic field intensity by magnetic energy minimization and show quite a small loss in the transfer efficiency.