Transmitter Control for Harmonics Reduction in Inductive Power Transfer System.

Magnetic field leakage is a significant problem in inductive power transfer systems. In particular, harmonics in the magnetic field leakage can interfere with wireless communication and affect adjacent devices. In this study, harmonics in the magnetic field leakage generated from a transmitter and receiver are suppressed by designing the waveform of the input voltage at the transmitter. The input voltage required to suppress the harmonics is formulated using the harmonic current extracted at the receiver. Simulation results show that the proposed method can reduce the 3rd to 9th harmonics in the magnetic field leakage by more than 62.5 dB compared with a method using a sinusoidal voltage source at the fundamental frequency.