Simultaneous Wireless Power and Data Transfer Systems Using LCC Network for High-quality Communication

This paper explores the merits for high-order data transfer circuits for a simultaneous wireless power and data transfer system, which adopts high-frequency data carrier injection. In order to improve the communication quality and low required injection current, the data transfer gain, cross-talk suppression, and input impedance of data channel are derived in a general manner when various networks are used. The limitation of one-element network is discussed, which further guides the design the two-element network. A three-element LCC network is proposed and shown to achieve a better multi-objective design. In the experiment, various data transfer circuits are compared in a 1-kW system. When a 20 kb/s signal is transferred with a carrier frequency at 1 MHz, the proposed LCC network is able to ensure sufficient data transfer gain (-8.4 dB), with high cross-talk suppression ability (-28.2 dB) and high input impedance (136 Ω). The total time delay is 4.5 μs.