Software-Based Power Sharing Control in Parallel Dual-Output Phase-Shift Full-Bridge Converters

Achieving effective power sharing among paralleled power converters is challenging due to diverse component technologies, environmental conditions, diode working points, parasitic parameters, and component tolerances. These disparities can lead to uneven thermal stress and aging, negatively impacting component lifetime and reliability. To address these issues, this paper introduces a novel modulation strategy for parallel dual-output phase-shift full-bridge converters. This software-based power-sharing control technique leverages MOSFET control and allows power transfer from a parallel connected diode-bridge to the active-bridge on the secondary side of the converter providing an effective means to mitigate thermal stress. The approach can also enable a complete shutdown of the diode-bridge. Detailed analytical developments of the proposed technique are presented and validated numerically.