A Simple Integrated and Low-Radiation Receiver for Inductive Power Transfer

It is promising to pursue an integrated low-profile receiver (RX) for inductive power transfer applications. However, the existing integration solutions suffer from the complicated structure and the insertion of dielectric material. This article proposes a novel excitation approach for the classical three-layer RX, and the structure inductance and capacitance are utilized for self-resonance. Without using additional dielectric material, proper magnetic material is evaluated and selected toward enhancing the structure capacitance and reducing the dielectric losses. The circuit model, radiation performance, and structure optimization are discussed in the simulation and experiment. A 750-kHz 100-W system is demonstrated to have a 92.4% coupler efficiency and 87.5% system efficiency. Compared to a classical RX, the proposed RX would slightly improve the shielding effect for the magnetic field and dramatically reduce the electric-field radiation by 15 dBm.