GaN-Based 5 kW Four-Level Totem-Pole PFC Converter for AI Server Power Supply

Inhalt:
This paper presents a compact flying capacitor multilevel (FCML) totem-pole bridgeless power-factor correction (PFC) rectifier for the high-efficiency and high-density switching power supplies of AI Servers. It is based on a 5 kW four-level FCML totem-pole PFC employing 200 V GaN devices. Compared to a two-level GaN FETs-based PFC, this paper's four-level FCML GaN totem-pole PFC utilizes only one single-stage EMI filter, allowing it to fit in the same cubic volume used for conventional 3 kW power supplies. The PFC is designed to follow the latest Open Compute Project (OCP) guidelines.