Single-phase matrix converter-based wireless power transfer using bidirectional GaN-FETs

Abstract

Wireless power transfer (WPT) is expanding beyond low-power consumer electronics to medium-power applications, driving the need for more compact and efficient power conversion. Conventional AC-DC-AC topologies suffer from increased size, losses, and reliance on bulky electrolytic capacitors, limiting their durability and scalability. This paper proposes a single-phase matrix converter (SPMC) for WPT, newly utilizing two gallium nitride (GaN) monolithic bidirectional switches (MBDSs) to achieve direct AC-AC conversion from 50 Hz to 100 kHz. The proposed topology eliminates rectifiers and power factor correction (PFC) circuits connected to the power grid, enhancing power density and improving system efficiency while reducing component count. As the first application of GaN MBDSs for WPT, the feasibility of the proposed system is validated through both theoretical analysis and experimental results based on a proof-of-concept prototype.