Generalized Average Modeling of Dual Active Bridge DC-DC Converter


Full-order continuous-time average modeling and dynamic analysis of bidirectional dc-dc dual active bridge (DAB) converters are studied. The transformer current in DAB converter is purely ac, making continuous-time modeling difficult. The proposed full-order continuous-time average model uses the dc terms and first order terms of transformer current and capacitor voltage as state variables, resulting in a third-order model, if capacitor equivalent series resistance (ESR) is not considered, and a sixth-order model if ESR is considered. A control-to-output-voltage transfer function is derived for DAB converters. Experimental results confirm that the proposed model correctly predicts the small-signal frequency response and an even more accurate prediction can be obtained if capacitor ESR is taken into account.


Electrical and Computer Engineering

Keywords and Phrases

Accurate Prediction; Average Model; Average Modeling; Bidirectional DC-DC Converters; Capacitor Voltages; Continuous Time; Dual Active Bridge Converter; Dual Active Bridges; Equivalent Series Resistance; First Order; Phase Shift Modulation; State Variables; Third-Order; Transformer Currents; Phase Shift Modulation; Capacitors; Continuous Time Systems; DC Transformers; Electric Resistance; Frequency Response; DC-DC Converters; Bidirectional DC-DC Converter

International Standard Serial Number (ISSN)

0885-8993; 1941-0107

Document Type

Article - Journal

Document Version


File Type





© 2012 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Apr 2012