A Simplified Half-Duplex Simultaneous Wireless Power and Data Transfer Circuit Using Misalignment Tolerant Magnetic Coupler

This article proposes a simple and efficient half-duplex simultaneous wireless power and data transfer (SWPDT) method using a multi-objective optimized magnetic coupler with high anti-misalignment ability. First, the working principle of the proposed SWPDT system, which needs to add extra components less than half of similar studies, is analyzed, and its requirements for magnetic coupler parameters to achieve a high signal-to-noise ratio (SNR) are given. Second, a target-based multi-objective particle swarm optimization with the k-means (T-MOPSO) method to achieve multi-objective optimization is analyzed, and a suitable magnetic coupler for rotating and lifting situations is designed. Third, the parameters of the magnetic coupler are optimized to achieve high misalignment tolerance and satisfy the requirements of SWPDT based on the T-MOPSO method. The experimental results show that the optimized magnetic coupler achieved a mutual inductance fluctuation of less than 6% within the range of 70 mm, exceeding 45% of the transmitter length, and the mutual inductance remains constant even when the receiver rotates. When the output power is more than 250 W, half-duplex communication with a data rate of more than 40 kbps to the receiver and 20 kbps to the transmitter, respectively, is achieved.