GaN-Based T-Type Totem-Pole Rectifier with ZVS Control and Reactive Power Regulation

This paper proposes a high-efficiency single-phase GaN-based T-type totem-pole front-end rectifier with reactive power transfer. A full-range zero voltage switching (ZVS) modulation approach for both unity power factor (PF) operation and non-unity PF operation is proposed for the GaN-based rectifier in critical conduction mode (CRM) operation. T-type mode operation and switching frequency limitation are proposed to overcome the ac-line zero-crossing challenges. A digital-based control strategy is also proposed to regulate the active power and reactive power simultaneously. A 1.6 kVA prototype of the T-type totem-pole rectifier is built and demonstrated with full-range ZVS operation, 98.9% full-load efficiency, and flexible reactive power regulation.