Performance Evaluation of the Multi-winding Redundancy Approach in MTB DC-DC Converters

The Multi-winding transformer-based (MTB) DCDC converter topologies have been investigated to be applied as the key component in different application fields, in particular those which are safety-critical ones, such as aerospace, energy distribution, and data-centers (data-processing). Thus, this paper presents a fault-tolerance concept associated with the possibility of operating the MTB topologies even under fault conditions, by only disconnecting the faulty cell and keeping the healthy ones operating continuously. In this approach, named Multi-winding redundancy (MWRed), the MTB converter is equipped with additional isolation switches which enhance its fault-tolerant capability. In contrast to competing approaches, MWRed utilizes the magnetic coupling of the MWT to reduce the use of several redundancies, which makes the strategy more appealing in critical applications. Further, in order to evaluate the impact of the isolation switches on MTB converters, the MWRed is assessed in terms of efficiency and reliability, so that the superior advantages to conventional approaches are presented and demonstrated. Finally, the investigated MWRed is evaluated experimentally to validate its effectiveness in different scenarios.


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