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A Microcontroller-Based High Efficiency Critical Conduction Mode Control for GaN-Based Totem-Pole PFC
Year: 2022 | Author: Xingyu Chen | Paper: H-S4.1
Fig. 1. 2.2kW two-phase interleaving GaN-based CRM totem-pole PFC prototype
In this paper, a microcontroller-based control method for the GaN-based critical conduction mode (CRM) totem-pole PFC is proposed. A simple digital control method based on synchronous rectifier (SR) on-time calculation which ensures zero-voltage switchign (ZVS) without zero current detection (ZCD) is proposed. Average current mode control is discussed and a compensator gain adjustment method is introduced to improve PF and restrain THD. Finally, all control functions are integrated in a microcontroller unit (MCU) and demonstrated on a 2.2 kW GaN-based two-phase interleaved CRM totem-pole PFC prototype as shown in Fig. 1. Fig. 2 shows the control diagram.
The prototype with proposed control method can reach a peak efficiency of 98.96% and full load efficiency of 98.55%. The converter reaches a PF of 0.996 at full load.
Fig. 2. Micro-controller based average current mode control with SR on-time calculation in a GaN-based two-phase interleaved CRM totem-pole CRM PFC
