Volume 37, Number 4, August 2019
|Page(s)||830 - 837|
|Published online||23 September 2019|
Small-Signal Model for Dual Active Bridge Series Resonant DC-DC Converters with Variable-Frequency and Phase-Shift Modulation
School of Automation, Northwestern Polytechnical University, Xi’an 710072, China
2 Department of Information Engineering, University of Padova, Padova 35131, Italy
Variable frequency and phase shift modulation can achieve zero-voltage switching (ZVS) of dual active bridge series resonant DC-DC converters(DABSRCs) over a wide operating range so as to effectively improving system efficiency and reliability. In order to study the dynamics of DABSRCs and provide the basis for the closed-loop compensator design, a continuous-time small-signal model is proposed. The generalized average modelling approach is adopted, in which the DC component of the output voltage and the fundamental component of the inductor current and resonant capacitor voltage are selected as the state variables, precisely describing impacts of the resonance on the system dynamics. On the above-mentioned basis, a closed-loop compensator is designed, which achieves the stable operation with the ZVS variable frequency and phase shift modulation. The analysis results are verified by the simulation and experimental results.
Key words: DC-DC converters / dual active bridge / series resonant / small-signal modeling / variable frequency / phase shift
关键字 : DC-DC变换器 / 双有源 / 串联谐振 / 小信号建模 / 变频 / 移相
© 2019 Journal of Northwestern Polytechnical University. All rights reserved.
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