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Bidirectional Converters (DC-DC Focus)

D02.12 - Bidirectional DC-DC CLLLC Resonant Converter Parallel Modules with Current Sharing Technology

Thursday, March 26, 2026
12:00 PM - 1:45 PM CT
Location: Hemisfair Ballroom
Two bidirectional DC-DC CLLLC resonant converters in parallel with current sharing control is implemented. The dual loop control strategy is proposed for output voltage regulation and current balance for two modules. The outer loop is for output voltage regulation with pulse frequency modulation (PFM) and the inner loop with average current method is for output current balance by pulse width modulation (PWM). Finally, an experimental prototype is implemented to verify its theoretical feasibility. Two CLLLC resonant converter with total rated power of 1300 W, with high voltage of 390 V ~ 400 V, and low voltage of 130 V. The highest efficiency of a single converter under step-down and step-up stages are 96.9 % and 97.1 %, respectively. If the worst case is considered and under the parallel operations, the output voltage regulation error is less than 1 % and the current sharing error is less than 1 %.