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In this paper, a new critical-conduction-mode (CRM)-based modulation is proposed for three-phase inverters. With this modulation, soft switching is achieved and the efficiency of the inverter is improved, especially for high frequency operation with SiC MOSFET. In three-phase string PV inverter applications, by operating at switching frequency above 300 kHz, power density of the inverter is estimated...
This paper focuses on how to implement critical conduction mode (CRM) control for GaN-based MHz totem-pole PFC with a commercial low-cost microcontroller (MCU), including basic CRM operation, programmed on-time control for achieving low current THD, off-time extension for achieving ZVS for whole line cycle operation, and two-phase interleaving control for input current ripple cancellation and EMI...
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