Controlled Single-Phase-Shift Modulation Method for a Fully Integrated Dual Active Bridge Converter

This paper focuses on control techniques for an integrated Dual Active Bridge (DAB) converter designed for low-voltage (5V) and low-power (2W) applications. The analysis concentrates on the single-phase-shift (SPS) modulation, as it offers the best balance between implementation simplicity and power efficiency for a control loop circuit that must be embedded within the system. Moreover, an innovative modulation technique called controlled single-phase-shift (CSPS) is introduced, which dynamically adjusts the phase-shift to maximize current flow through the load. This approach enhances the output power range by 33%, achieving an increase in the average efficiency throughout the phase-shift interval up to 4% when compared to the conventional SPS modulation. Circuit-level simulations have been conducted in Cadence Virtuoso environment to verify the effectiveness of the proposed approach.