Single-wire current-share paralleling of current-mode controlled DC power supplies

This paper presents a new single-wire autonomous current-share paralleling of current-mode controlled DC power supplies. The proposed control scheme makes use of the nature of fast response of the inner current loop and the share bus injected signal to improve the response of the power system. It reduces the unbalance of current distribution during the transient state and avoids the fault alarm for the current limit. Through the theoretical derivation, the design of the proposed control can be used by the multi-loop control method. A design example of a system of two 400 V/48 V 20 A modules is set up and experimental recordings verify the performance of current sharing.