Hybrid Wireless Power Transfer With Self-Resonance Coupler Based on Integrated Coil

摘要

According to the duality of inductive wireless power transfer (IPT) and capacitive wireless power transfer (CPT) in coupler and tuning method, an integrated coil is designed in this paper to constructs a compact hybrid wireless power transfer (HPT). The magnetic field coupling and the electric field coupling constructed by coils and plates share one energy transmission channel, which enhances the transmission power and energy density. The inductance of coils and capacitances of plates compensate for each other. The resonant frequency of integrated coils is adjusted to kHz. Additional tuning inductances and capacitances are eliminated to build a lighter self-resonance coupler. The stacked structure design of coils and plates enables compact integration and miniaturization of integrated coils. A 300W experimental platform was built, and some comparative experiments were conducted. Compared to the coupler of IPT, the self-resonance coupler has improved performance in transmission power, anti-offset, and over-coupling suppression. HPT performs better than CPT in transmission distance, transmission power, and transmission efficiency. It has some advantages in the medium-power application scenarios such as inspection robots and drones, which expect couplers to have a smaller volume, lighter weight, higher power density and better anti-offset.