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Accurate Small-Signal Model for the Digital Control of an Automotive Bidirectional Dual Active Bridge

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2 Author(s)
Krismer, F. ; Power Electron. Syst. Lab., ETH Zurich, Zurich, Switzerland ; Kolar, J.W.

The derivation of an accurate small-signal model for a galvanically isolated, bidirectional dc-dc converter and the implementation of a corresponding controller on a DSP as well as key methods and functions required for the digital implementation are detailed in this paper. The investigated dc-dc converter, an automotive dual active bridge (DAB) system, enables power transfer between a low-voltage port (ranging from 11 to 16 V) and an HV port (240 to 450 V). The nominal power rating is 2 kW. The developed small-signal model yields highly accurate results for the DAB system, but the proposed modeling procedure could also be applied to arbitrary resonant power converters with unidirectional or bidirectional power transfer.

Published in:

Power Electronics, IEEE Transactions on  (Volume:24 ,  Issue: 12 )

Date of Publication:

Dec. 2009

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