High Step-up DC-DC Converter with Reconfiguration Capability

In this paper a high step-up DC-DC converter is proposed with reconfiguration capability that can operate safely without redundancy even if one of its power electronic switches fails. The proposed converter topology provides continuous input current, reduce voltage stress, uniform current sharing among power electronic switches, common grounding features, and also reduces the power handled by the power electronic devices using alternate paths, thereby improves the converter overall efficiency. Further, the control technique used for the converter reduces the transients during the healthy and fault operations. A fuse-MOSFET pair has been used to protect the converter from short-circuit faults. The proposed converter characteristic is analyzed in the continuous current mode (CCM), and its features are discussed in detail for both healthy and fault operation. The proposed converter was designed, fabricated and experimentally tested in a closed loop at 100 W to verify the operation and feasibility of the controller designed for both healthy and fault operation.