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High power density dc/dc converter: Selection of converter topologyThe work involved in the identification and selection of a suitable converter topology is described. Three new dc/dc converter topologies are proposed: Phase-Shifted Single Active Bridge DC/DC Converter; Single Phase Dual Active Bridges DC/DC Converter; and Three Phase Dual Active Bridges DC/DC Converter (Topology C). The salient features of these topologies are: (1) All are minimal in structure, i.e., each consists of an input and output bridge, input and output filter and a transformer, all components essential for a high power dc/dc conversion process; (2) All devices of both the bridges can operate under near zero-voltage conditions, making possible a reduction of device switching losses and hence, an increase in switching frequency; (3) All circuits operate at a constant frequency, thus simplifying the task of the magnetic and filter elements; (4) Since, the leakage inductance of the transformer is used as the main current transfer element, problems associated with the diode reverse recovery are eliminated. Also, this mode of operation allows easy paralleling of multiple modules for extending the power capacity of the system; (5) All circuits are least sensitive to parasitic impedances, infact the parasitics are efficently utilized; and (6) The soft switching transitions, result in low electromagnetic interference. A detailed analysis of each topology was carried out. Based on the analysis, the various device and component ratings for each topology operating at an optimum point, and under the given specifications, are tabulated and discussed.
Document ID
19900005151
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Divan, Deepakraj M. (Wisconsin Univ. Madison, WI, United States)
Date Acquired
September 6, 2013
Publication Date
January 3, 1990
Subject Category
Electronics And Electrical Engineering
Report/Patent Number
NASA-CR-186129
NAS 1.26:186129
Accession Number
90N14467
Funding Number(s)
CONTRACT_GRANT: NAG3-804
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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