Evaluation of Efficiency and Power Factor in 3-kW GaN-Based CCM/CRM Totem-Pole PFC Converters for Data Center Application

GaN-based totem-pole power factor correction (PFC) is widely used for data center applications to achieve high efficiency and high power density. In this paper, a design of GaN-based continuous conduction mode (CCM) and critical conduction mode (CRM) totem-pole PFC converters is proposed. Based on simulation and experiment, the efficiency and power factor (PF) for 3-kW applications in CCM and CRM are evaluated. It is concluded that, at the same 3-KW power level, although the CCM operation has lower peak current, the CRM operation shows a higher efficiency with smaller inductor size and moderate PF, thus more promising for the data center applications.