An Isolated Three-Phase Matrix Converter Rectifier For AI Server Infrastructure

In this paper, an isolated three-phase matrix converter-based industrial rectifier with high frequency isolation is proposed for powering AI servers. By directly modulating the input three-phase AC, the matrix converter eliminates the need for bulky DC-link capacitors typically used for intermediate energy storage. This direct conversion enhances power density and improves overall system reliability. A digital dual 4-step switching strategy is employed to optimize bidirectional switch commutation and prevent shoot-through faults, ensuring efficient and safe operation. Additionally, a high-frequency transformer provides galvanic isolation and supports efficient power transfer, further improving operational performance and load protection. A design example is presented to demonstrate a compact, robust, and reliable three-phase AC-to-DC conversion solution for demanding industrial HVDC applications targeting AI workloads. Experimental validation is carried out on a 208V, 3-phase 1 kW prototype implementing the proposed algorithm.