Performance Improvement of a Three-Phase Interleaved DC-DC Converter without Requiring Antisaturation Control for Postfault Conditions

Employing interleaved techniques in dc-dc converters provide fault-tolerant capability to the faulted switches of the converter. In the case of one-phase failure, the other phases can continue operating. However, in interleaved topologies, if the output power is maintained at the desired constant value for postfault conditions, there is a saturation risk of inductors. In this letter, a postfault reconfiguration process for the three-phase interleaved dc-dc converter is proposed, which guarantees the operation of the inductor without saturation risk after power switch failures. The reconfiguration steps do not require isolating the inductor of the corresponding faulty phase. Experimental results of the presented converter verify the operation of the inductor without saturation and the effectiveness of the proposed strategy.