Modeling the effect of dead-time on the soft-switching characteristic of variable-frequency modulated series-resonant DAB converter

Under wide-range variations in output current and voltage, dual-active-bridge (DAB) converter can operate with increased conduction and switching loss. A variable frequency-based power modulation scheme for an LC-type series resonant DAB converter is presented to achieve minimum-tank-current operation along with full-range soft switching. The proposed minimum-tank-current operation establishes an in-phase relationship between tank current and secondary-side voltage (low voltage and high current), which allows the switching devices of DAB converter to operate in soft-switching region. Resonant transitions of parasitic capacitances within the dead-time interval of switching devices are considered to avoid incomplete soft switching. Simulation and experimental results show the effectiveness of the proposed method with a maximum efficiency of 96.8 %.

[1]  Wenhua Liu,et al.  Overview of Dual-Active-Bridge Isolated Bidirectional DC–DC Converter for High-Frequency-Link Power-Conversion System , 2014, IEEE Transactions on Power Electronics.

[2]  D.M. Divan,et al.  A three-phase soft-switched high power density DC/DC converter for high power applications , 1988, Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting.

[3]  Ralph M. Burkart,et al.  ZVS of Power MOSFETs Revisited , 2016, IEEE Transactions on Power Electronics.

[4]  Wenhua Liu,et al.  Power Characterization of Isolated Bidirectional Dual-Active-Bridge DC–DC Converter With Dual-Phase-Shift Control , 2012, IEEE Transactions on Power Electronics.

[5]  H. Akagi,et al.  A Bidirectional DC–DC Converter for an Energy Storage System With Galvanic Isolation , 2007, IEEE Transactions on Power Electronics.

[6]  Wenhua Liu,et al.  Efficiency Characterization and Optimization of Isolated Bidirectional DC–DC Converter Based on Dual-Phase-Shift Control for DC Distribution Application , 2013, IEEE Transactions on Power Electronics.

[7]  Raimo Juntunen,et al.  Variable-Frequency Phase Shift Modulation of a Dual Active Bridge Converter , 2015, IEEE Transactions on Power Electronics.

[8]  Udaya K. Madawala,et al.  A Dual-Active Bridge Topology With a Tuned CLC Network , 2015, IEEE Transactions on Power Electronics.

[9]  Johann W. Kolar,et al.  Performance Optimization of a High Current Dual Active Bridge with a Wide Operating Voltage Range , 2006 .

[10]  M. Liserre,et al.  Future Energy Systems: Integrating Renewable Energy Sources into the Smart Power Grid Through Industrial Electronics , 2010, IEEE Industrial Electronics Magazine.

[11]  M. Yaqoob,et al.  Extension of Soft-Switching Region of Dual-Active-Bridge Converter by a Tunable Resonant Tank , 2017, IEEE Transactions on Power Electronics.

[12]  Xiaodong Li,et al.  Analysis and Design of High-Frequency Isolated Dual-Bridge Series Resonant DC/DC Converter , 2010, IEEE Transactions on Power Electronics.

[13]  Dushan Boroyevich,et al.  Switching condition and loss modeling of GaN-based dual active bridge converter for PHEV charger , 2016, 2016 IEEE Applied Power Electronics Conference and Exposition (APEC).

[14]  G.O. Garcia,et al.  Switching Control Strategy to Minimize Dual Active Bridge Converter Losses , 2009, IEEE Transactions on Power Electronics.

[15]  Dushan Boroyevich,et al.  The optimal design of GaN-based Dual Active Bridge for bi-directional Plug-IN Hybrid Electric Vehicle (PHEV) charger , 2015, 2015 IEEE Applied Power Electronics Conference and Exposition (APEC).

[16]  R. Zane,et al.  Minimum Current Operation of Bidirectional Dual-Bridge Series Resonant DC/DC Converters , 2012, IEEE Transactions on Power Electronics.

[17]  Udaya K. Madawala,et al.  A New Resonant Bidirectional DC–DC Converter Topology , 2014, IEEE Transactions on Power Electronics.