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Electronics 2015, 4(2), 239-260; doi:10.3390/electronics4020239

Analysis of a Multilevel Dual Active Bridge (ML-DAB) DC-DC Converter Using Symmetric Modulation

The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA
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Author to whom correspondence should be addressed.
Academic Editor: Bimal K. Bose
Received: 30 January 2015 / Accepted: 2 April 2015 / Published: 20 April 2015
(This article belongs to the Special Issue Multi-Level Converters)

Abstract

Dual active bridge (DAB) converters have been popular in high voltage, low and medium power DC-DC applications, as well as an intermediate high frequency link in solid state transformers. In this paper, a multilevel DAB (ML-DAB) has been proposed in which two active bridges produce two-level (2L)-5L, 5L-2L and 3L-5L voltage waveforms across the high frequency transformer. The proposed ML-DAB has the advantage of being used in high step-up/down converters, which deal with higher voltages, as compared to conventional two-level DABs. A three-level neutral point diode clamped (NPC) topology has been used in the high voltage bridge, which enables the semiconductor switches to be operated within a higher voltage range without the need for cascaded bridges or multiple two-level DAB converters. A symmetric modulation scheme, based on the least number of angular parameters rather than the duty-ratio, has been proposed for a different combination of bridge voltages. This ML-DAB is also suitable for maximum power point tracking (MPPT) control in photovoltaic applications. Steady-state analysis of the converter with symmetric phase-shift modulation is presented and verified using simulation and hardware experiments. View Full-Text
Keywords: dual active bridge; DC-DC multilevel converter; neutral point clamped (NPC); symmetric modulation; soft-switching dual active bridge; DC-DC multilevel converter; neutral point clamped (NPC); symmetric modulation; soft-switching
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Moonem, M.A.; Pechacek, C.L.; Hernandez, R.; Krishnaswami, H. Analysis of a Multilevel Dual Active Bridge (ML-DAB) DC-DC Converter Using Symmetric Modulation. Electronics 2015, 4, 239-260.

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