Design of a Secondary Side Auxiliary Compensator for Current-Sharing Control of Input-Parallel Output-Parallel Phase-Shifted Full-Bridge Converters

In this article, a secondary side auxiliary current-sharing compensator (ACSC) for the input-parallel output-parallel (IPOP) phase-shift full-bridge (PSFB) converter is proposed, which can ensure balanced current sharing among the parallel converter modules. Moreover, the proposed scheme can minimize the output gain difference among all converter modules according to the dynamic tuning of duty cycles of ACSCs, which have the superiority of normal operation without extra current sensors and information of circuit parameters. To verify the effectiveness of the proposed method, experimental validation is conducted based on the prototype of 900 W three-phase IPOP PSFB converter, proving that the balanced current sharing and a wide range of high efficiency (>95.5%) can be simultaneously achieved.