A Novel Simultaneous Wireless Power and Data Transfer Scheme for Two-stage Inductive Power Transfer Systems

Simultaneous wireless power and data transfer (SWPDT) is proposed to realize the functions including closed-loop control, state monitoring, instruction delivering, and information exchange in inductive power transfer systems. However, the significant interference from power transfer to data transfer (P2D interference) limits the practical implementation of SWPDT. To solve this problem, this paper proposes a novel SWPDT scheme. The data is not transferred in the transition stages of the power switches. A dedicated frame header and end are designed to demodulate the data correctly in the receiving side. The proposed SWPDT scheme is verified by simulation. The output power is 11.1 kW while the data transfer rate is 1.6 Mbps. No bit error is observed, validating the reliability of the proposed SWPDT scheme.

I. Introduction

Inductive power transfer (IPT) shows the advantages of convenience, flexibility, galvanic isolation, low maintenance, and weather proofing. It has been employed in various fields including electrified transportation, home appliances, consumer electronics, underwater vehicles [1]. To realize the functions such as closed-loop control, state monitoring, instruction delivering, and information exchange in IPT systems, high-rate and reliable wireless communication between the primary and secondary sides is inevitable. However, conventional radio frequency communication is sensitive to the magnetic flux around the IPT systems. The bit error rate (BER) increases when the transferred power is raised. Hence, simultaneous wireless power and data transfer (SWPDT) is proposed [2].