Novel Isolated Multilevel DC–DC Power Converter

An isolated multilevel dc-dc power converter is proposed in this paper. The proposed isolated multilevel dc-dc power converter consists of an isolated power converter, a series/parallel switching circuit, and an output L-C filter. The isolated power converter is composed of a half-bridge inverter, a three-winding transformer, and two full-bridge rectifiers. The half-bridge inverter is switched in constant duty to generate two output dc voltages through two secondary windings of the three-winding transformer and two full-bridge rectifiers, respectively. The series/parallel switching circuit is used to control the two output dc voltages of the isolated power converter connected in series or in parallel, to control the output voltage of isolated multilevel dc-dc power converter. To verify the performance of the proposed isolated multilevel dc-dc power converter, a prototype is developed and tested. The experimental results show that the proposed isolated multilevel dc-dc power converter has the expected performance.

[1]  Akshay Kumar Rathore,et al.  Optimal Low-Switching Frequency Pulsewidth Modulation of Medium Voltage Seven-Level Cascade-5/3H Inverter , 2015 .

[2]  Fan Zhang,et al.  Study of the multilevel converters in DC-DC applications , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[3]  Gun-Woo Moon,et al.  A three-level converter with reduced filter size using two transformers and flying capacitors , 2011, 8th International Conference on Power Electronics - ECCE Asia.

[4]  Leon M. Tolbert,et al.  Bi-directional power management and fault tolerant feature in a 5-kW multilevel dc-dc converter with modular architecture , 2009 .

[5]  Alex Q. Huang,et al.  Coupling Effect Reduction of a Voltage-Balancing Controller in Single-Phase Cascaded Multilevel Converters , 2012, IEEE Transactions on Power Electronics.

[6]  Kui Wang,et al.  Stability and Voltage Balance Control of a Modular Converter With Multiwinding High-Frequency Transformer , 2014, IEEE Transactions on Power Electronics.

[7]  Fan Zhang,et al.  Power losses and efficiency analysis of multilevel dc-dc converters , 2005, Twentieth Annual IEEE Applied Power Electronics Conference and Exposition, 2005. APEC 2005..

[8]  Leon M. Tolbert,et al.  Modular Multilevel Inverter with New Modulation Method and Its Application to Photovoltaic Grid-Connected Generator , 2013, IEEE Transactions on Power Electronics.

[9]  June-Seok Lee,et al.  Comparison of Tolerance Controls for Open-Switch Fault in a Grid-Connected T-Type Rectifier , 2015, IEEE Transactions on Power Electronics.

[10]  Bhatkar Anup Ashok,et al.  A solar power generation system with a seven-level inverter , 2018 .

[11]  Hirofumi Akagi,et al.  Low-Modulation-Index Operation of a Five-Level Diode-Clamped PWM Inverter With a DC-Voltage-Balancing Circuit for a Motor Drive , 2012, IEEE Transactions on Power Electronics.

[12]  Peter W. Lehn,et al.  Design and control of a bidirectional triangular modular multilevel DC-DC converter , 2013, 2013 IEEE 14th Workshop on Control and Modeling for Power Electronics (COMPEL).

[13]  L. Zhang,et al.  Multilevel DC-Link Inverter and Control Algorithm to Overcome the PV Partial Shading , 2013, IEEE Transactions on Power Electronics.

[14]  L. Solero,et al.  Multi-level configurations for three-phase AC-DC 48V power supply , 2010, 2010 IEEE International Symposium on Industrial Electronics.

[15]  Feng Zhao,et al.  Design of a high-frequency isolated DTHB CLLC bidirectional resonant DC-DC converter , 2014, 2014 IEEE Conference and Expo Transportation Electrification Asia-Pacific (ITEC Asia-Pacific).