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    Bidirectional Converters (AC-DC Focus)

    T38.3 - ZVS Turn-on Integrated Triangular Current Mode Control for Three-Phase Three-Level Flying Capacitor Bidirectional PFC

    Thursday, March 26, 2026
    11:00 AM - 11:20 AM CT
    Location: 217B
    As power demand for on-board chargers (OBC) is increasing to meet the fast-charging requirements, 800 V DC bus voltage is being adopted for PFCs to reduce the copper losses in OBCs. For higher voltage operation, multi-level converter topologies employ the benefit of reducing device stress and common-mode voltage. The flying capacitor multi-level (FCML) converter has the added advantage of frequency multiplication. However, switching frequency is still limited by the high turn-on losses, hence ZVS turn-on integrated Triangular Current Mode (iTCM) control is presented in this paper for multi-level PFCs. As compared to Triangular Current Mode (TCM) control, iTCM has the benefit of very low high frequency current in the main boost inductor which is achieved by adding an LC-branch to the converter such that the high frequency current is filtered by this branch. Hence, iTCM is introduced in this paper for three-level FCML converter with one single common LC branch for ZVS turn-on of all the devices. The proposed technique is implemented on a GaN based three-level FCML 800 V PFC at 11 kW. The efficiency achieved is 98.6% at a minimum inductor current frequency of 330 kHz.