Abstract:
This paper examines the high power density bidirectional dc-dc converter with interleaving, soft-switching, and near critical conduction mode (near-CRM). Systematic design and control methods improve passive current balancing between multiple interleaved phases without phase current feedbacks. This paper first analyzes zero voltage turn-on operation, including energy diversion by the added snubber capacitor and turn-off resonance models. Second, the intrinsic inverse co-relation between phase current deviation and effective duty cycle variation is quantified and modeled as a closed-loop mechanism that passively balances currents. Then, the near-CRM mode’s snubber capacitance, dead time, and valley currents are designed to effectively counteract the current unbalance. Finally, a variable switching frequency control actively controls the valley current and maintains current balancing effectiveness throughout the operating range. An IGBT-based 20-kW three-phase interleaved prototype with 99.1% efficiency is built to test the design and control methods.
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