Two-Input DC-DC Converter For DC-Grid Applications

A new two-input DC-DC converter suitable to draw power from two different dc sources feeding a common dc-bus is presented in this paper. This is a two-switch converter belongs to sixth-order family and performs bucking operation for one dc source while it allows both bucking as well as boosting feature with the second source. The salient feature of the proposed converter is that both the sources either individually or simultaneously supply power to the downstream load at reduced ripple current. This feature is particularly attractive for photovoltaic power processing applications. A digital voltage-mode controller is designed for downstream dc-bus regulation while the current controller regulates the power from the weak input power source. A 24 V, 100 Watt converter performance is analyzed through simulations and then compared with the experimental observations.