This paper presents a boundary control scheme for dual active bridge (DAB) converters using the natural switching surface (NSS). The implementation of a curved switching surface for DAB converters is a new area of research undertaken in this paper. The proposed technique brings the benefit of unprecedented dynamic performance, already developed for nonisolated topologies (e.g., buck and boost), to this more complex isolated topology. The analysis provides insight into the natural trajectories of the DAB converters and creates an accurate framework in the normalized geometrical domain. As a result, the physical limits of the converter under study become evident. Those physical limits are exploited by employing the NSS to obtain fast transient response under start-up, sudden load transients, and reference change. In addition, fixed-frequency operation is one of the key features of the proposed control scheme, which allows optimizing the design of the high-frequency transformer. Experimental results are presented to validate the NSS for DAB converters and illustrate the benefits of the normalization technique. Index Terms-Boundary control, dc-dc isolated converters, dual active bridge (DAB) converter, natural switching surface (NSS).

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A boundary control scheme for boost converters with enhanced performance using the natural switching surface (NSS) is presented in this paper. The derivation of the Switching Surface (SS) is performed in the normalized domain to obtain a general geometrical representation that is applicable to any combination of boost converter parameters. The resulting SS provides an excellent dynamic response during start-up and sudden load changes, achieving steady state in only one switching action. In order to illustrate the characteristic features and the superior performance of the natural SS, a geometrical analysis is fully developed and compared to other recent SSs. A design example is presented to illustrate the benefits of the normalization technique, and the qualities of the natural SS are confirmed with experimental results of a 30 W, 10 V/22 V converter.978-1-4577-0541-0/11/$26.00 ©2011 IEEE

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