Comparative Analysis of Power Devices in Power Supply Units for AI Server Applications

Each server rack within the data center necessitates a Power Supply Unit (PSU) to facilitate power delivery. The PSU is designed as a combination of a Power Factor Correction (PFC) converter and a half-bridge LLC resonant converter, specifically employed at the front end of AI servers to convert 110 V AC to 48 V DC. This study focuses on the comparative analysis of different power devices utilized as switching components. In particular, the effects of Silicon (Si), Silicon Carbide (SiC), and Gallium Nitride (GaN) on power factor and efficiency are investigated. The findings aim to provide insights into the optimal selection of power devices for enhancing the performance of power supply circuits in AI server applications.