Analysis and design of parallel-connected peak-current-mode-controlled switching DC/DC power supplies

A parallel connected peak-current-mode-controlled (PCMC) switched- mode DC/DC power supply, together with single-wire autonomous current sharing, is proposed and analysed. To avoid the minor alarm of the current limit and reduce the unbalance of current distribution during the transient state, the nature of the fast response of the PCMC is integrated with a current-sharing circuit to adjust automatically the trim signal that exists in conventional DC/DC power converters. A design example of three 150 W (48/5 V, 30 A) full-brick type (2.4×4.6×0.5 inch) parallel modules has been constructed and experimental results verify the performance of current sharing.