Fully Soft-Switched Dual-Active-Bridge Series-Resonant Converter With Switched-Impedance-Based Power Control

Both conduction loss and switching loss can contribute significantly to the overall power loss of an isolated bidirectional dual-active-bridge series-resonant dc–dc converter (DABSRC) operating at high frequency. To achieve soft switching and minimum-tank-current operation under wide-range variations in output voltage and current, a switched-impedance-based DABSRC is proposed. Minimum-tank-current operation aims to reduce conduction loss arising from circulating current at the low voltage, high-current side of DABSRC. Full-range soft switching is achieved in all switches, thus, switching loss is significantly reduced. With this new topology, power control is achieved by controlling a switch-controlled capacitor in the series resonant tank while ensuring minimum-tank-current operation and soft switching in all switches. The proposed topology and modulation scheme are validated by means of a 1-kW experimental prototype of DABSRC operating at 100 kHz designed to interface a 250-V dc bus to a supercapacitor with a rated output voltage of 48 V. The effectiveness of the proposed topology for charging/discharging a supercapacitor at a maximum rated power of 1 kW is verified by simulations and experimental results with a maximum efficiency of 97.5%.

[1]  Yan-Fei Liu,et al.  An interleaved LLC resonant converter operating at constant switching frequency , 2014, 2012 IEEE Energy Conversion Congress and Exposition (ECCE).

[2]  Yan Xing,et al.  A Secondary-Side Phase-Shift-Controlled LLC Resonant Converter With Reduced Conduction Loss at Normal Operation for Hold-Up Time Compensation Application , 2015, IEEE Transactions on Power Electronics.

[3]  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.

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

[5]  Bijan Abbasi Arand,et al.  High step-up dual full-bridge ZVS DC–DC converter with improved integrated magnetics and new resonant switched capacitor cell , 2017 .

[6]  Qingguang Yu,et al.  Extended-Phase-Shift Control of Isolated Bidirectional DC–DC Converter for Power Distribution in Microgrid , 2012, IEEE Transactions on Power Electronics.

[7]  T. G. Habetler,et al.  A wide input voltage range ZVS isolated bidirectional DC-DC converter for ultra-capacitor application in hybrid and electric vehicles , 2012, 2012 IEEE International Electric Vehicle Conference.

[8]  Brendan P. McGrath,et al.  ZVS Soft Switching Boundaries for Dual Active Bridge DC–DC Converters Using Frequency Domain Analysis , 2017, IEEE Transactions on Power Electronics.

[9]  Shaojun Xie,et al.  Voltage-Fed Dual Active Bridge Bidirectional DC/DC Converter With an Immittance Network , 2014, IEEE Transactions on Power Electronics.

[10]  Bo-Hyung Cho,et al.  Fundamental Duty Modulation of Dual-Active-Bridge Converter for Wide-Range Operation , 2016, IEEE Transactions on Power Electronics.

[11]  K. Harada,et al.  A new method to regulate resonant converters , 1988 .

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

[13]  Guowei Liu,et al.  Universal High-Frequency-Link Characterization and Practical Fundamental-Optimal Strategy for Dual-Active-Bridge DC-DC Converter Under PWM Plus Phase-Shift Control , 2015, IEEE Transactions on Power Electronics.

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

[15]  Johann W. Kolar,et al.  Accurate Power Loss Model Derivation of a High-Current Dual Active Bridge Converter for an Automotive Application , 2010, IEEE Transactions on Industrial Electronics.

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

[17]  C. C. Chan,et al.  The State of the Art of Electric, Hybrid, and Fuel Cell Vehicles , 2007, Proceedings of the IEEE.

[18]  Douglas J. Nelson,et al.  Energy Management Power Converters in Hybrid Electric and Fuel Cell Vehicles , 2007, Proceedings of the IEEE.

[19]  Goro Fujita,et al.  Investigation of ZVS condition for dual-active-bridge converter using dual-phase-shift modulation , 2014, 2014 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC).

[20]  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.

[21]  J. Kolar,et al.  Closed Form Solution for Minimum Conduction Loss Modulation of DAB Converters , 2012, IEEE Transactions on Power Electronics.

[22]  H. Akagi,et al.  A Bidirectional Isolated DC–DC Converter as a Core Circuit of the Next-Generation Medium-Voltage Power Conversion System , 2007, IEEE Transactions on Power Electronics.

[23]  Yoichi Ishizuka,et al.  A Power Efficiency Improvement Technique for a Bidirectional Dual Active Bridge DC–DC Converter at Light Load , 2014, IEEE Transactions on Industry Applications.

[24]  Hui Li,et al.  A Soft Switching Three-phase Current-fed Bidirectional DC-DC Converter With High Efficiency Over a Wide Input Voltage Range , 2012, IEEE Transactions on Power Electronics.

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

[26]  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.

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

[28]  Wenhua Liu,et al.  A Synthetic Discrete Design Methodology of High-Frequency Isolated Bidirectional DC/DC Converter for Grid-Connected Battery Energy Storage System Using Advanced Components , 2014, IEEE Transactions on Industrial Electronics.

[29]  German G Oggier,et al.  Modulation strategy to operate the dual active bridge DC-DC converter under soft switching in the whole operating range , 2011, IEEE Transactions on Power Electronics.

[30]  Kaushik Rajashekara,et al.  Power Electronics and Motor Drives in Electric, Hybrid Electric, and Plug-In Hybrid Electric Vehicles , 2008, IEEE Transactions on Industrial Electronics.

[31]  Paulo P. Praca,et al.  Steady-State Analysis of a ZVS Bidirectional Isolated Three-Phase DC–DC Converter Using Dual Phase-Shift Control With Variable Duty Cycle , 2016 .

[32]  Jee-Hoon Jung,et al.  Design Methodology of Bidirectional CLLC Resonant Converter for High-Frequency Isolation of DC Distribution Systems , 2013, IEEE Transactions on Power Electronics.

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

[34]  Johann W. Kolar,et al.  Efficiency-Optimized High-Current Dual Active Bridge Converter for Automotive Applications , 2012, IEEE Transactions on Industrial Electronics.

[35]  A. Khaligh,et al.  Power electronics intensive solutions for advanced electric, hybrid electric, and fuel cell vehicular power systems , 2006, IEEE Transactions on Power Electronics.

[36]  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.

[37]  Hua Bai,et al.  Eliminate Reactive Power and Increase System Efficiency of Isolated Bidirectional Dual-Active-Bridge DC–DC Converters Using Novel Dual-Phase-Shift Control , 2008, IEEE Transactions on Power Electronics.

[38]  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.