Power Factor Correction, CCM, DCM, CRM/BCM Control, Bridgeless
Technical Lecture Session
High-Power AC-DC Converters
Figure-of-Merit (FoM), multilevel, high-density and high-efficiency, GaN
In space-limited applications, multilevel converters have shown great advantages in efficiency and power density. In traditional design process, for a selected voltage level number, the voltage rating of devices is decided; and, the loss of each device should be calculated. Furthermore, with selectable numbers of voltage level increasing, the complexity of design grows rapidly. In this paper, a simplified method based on device Figure-of-Merit (FoM) is proposed. Given the efficiency requirement, optimal frequency and voltage level can be easily obtained. According to the method, a 2kW prototype is built, achieving over 99% efficiency and 1400W/in3 power density.