Optimal efficiency operation of non-isolated DC/DC converter for high voltage ratio applications

In this paper, a global optimal study of the efficiency of a cascaded structure with synchronous rectification composed of two sub-converters has been presented, this converter allows obtaining high voltage ratio and consists of two-interleaved boost converter which was chosen as 1st sub-converter and three-level boost converter which was chosen as 2nd sub-converter. An optimal efficiency operation as a function of the intermediate voltage and the branch number of the first converter is studied by the aid of an adaptive losses estimation algorithm to estimate the components losses for each DC/DC converter. The estimated power losses of the two converters are modeled by two estimated resistances. These estimated resistances are used to study and optimize the relation between the intermediate voltage and the global efficiency and also the influence of the number of branches of the interleaved converter on the total global losses. The algorithm is theoretically analyzed, developed and compared with the experimental results. Experimental results allow validating the proposed analysis for maximizing global efficiency.

[1]  Wonsuk Choi,et al.  Switching loss estimation of high voltage power MOSFET in power factor correction pre-regulator , 2011, 2011 Twenty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[2]  J. Kolar,et al.  A Novel Low-Loss Modulation Strategy for High-Power Bidirectional Buck ${\bm +}$ Boost Converters , 2009, IEEE Transactions on Power Electronics.

[3]  S. Pierfederici,et al.  New Method to Filter HF Current Ripples Generated by Current-Fed DC/DC Converters , 2011, IEEE Transactions on Power Electronics.

[4]  S. Pierfederici,et al.  Approximate novel loss formulae estimation for optimization of power controller of DC/DC converter , 2010, IECON 2010 - 36th Annual Conference on IEEE Industrial Electronics Society.

[5]  B. Nahid-Mobarakeh,et al.  Large Signal Stability Analysis Tools in DC Power Systems With Constant Power Loads and Variable Power Loads—A Review , 2012, IEEE Transactions on Power Electronics.

[6]  R. Murray,et al.  Differential flatness and absolute equivalence , 1994, Proceedings of 1994 33rd IEEE Conference on Decision and Control.

[7]  W. Eberle,et al.  A simple switching loss model for buck voltage regulators with current source drive , 2008, 2008 IEEE Power Electronics Specialists Conference.

[8]  S. Pierfederici,et al.  An Adapted Control Strategy to Minimize DC-Bus Capacitors of a Parallel Fuel Cell/Ultracapacitor Hybrid System , 2011, IEEE Transactions on Power Electronics.

[9]  Bernard Davat,et al.  New non-linear control strategy for non-isolated DC/DC converter with high voltage ratio , 2010 .

[10]  W. Eberle,et al.  A Practical Switching Loss Model for Buck Voltage Regulators , 2009, IEEE Transactions on Power Electronics.

[11]  T. Durbaum,et al.  Calculating core losses in transformers for arbitrary magnetizing currents a comparison of different approaches , 1996, PESC Record. 27th Annual IEEE Power Electronics Specialists Conference.

[12]  Serge Pierfederici,et al.  Flatness-Based Control of Three-Phase Inverter With Output $LC$ Filter , 2012, IEEE Transactions on Industrial Electronics.

[13]  P. Zumel,et al.  Simple Model and Experimental Identification of a Fuel-Cell-Based Power Supply Oriented to System-Level Analysis , 2011, IEEE Transactions on Power Electronics.

[14]  Jianjing Wang,et al.  An Investigation Into the Effects of the Gate Drive Resistance on the Losses of the MOSFET–Snubber–Diode Configuration , 2012, IEEE Transactions on Power Electronics.

[15]  M. Sippola,et al.  Accurate prediction of high-frequency power-transformer losses and temperature rise , 2002 .

[16]  S. Pierfederici,et al.  High voltage ratio non-isolated DC-DC converter for fuel cell power source applications , 2008, 2008 IEEE Power Electronics Specialists Conference.

[17]  B. Nahid-Mobarakeh,et al.  General Active Global Stabilization of Multiloads DC-Power Networks , 2012, IEEE Transactions on Power Electronics.

[18]  Sung-Soo Hong,et al.  A new mode changeable full bridge dc/dc converter for wide input voltage range , 2011, 8th International Conference on Power Electronics - ECCE Asia.

[19]  Wai Tung Ng,et al.  Predictive Efficiency Optimization for DC–DC Converters With Highly Dynamic Digital Loads , 2008, IEEE Transactions on Power Electronics.

[20]  Jean-Philippe Martin,et al.  High Voltage Ratio DC–DC Converter for Fuel-Cell Applications , 2010, IEEE Transactions on Industrial Electronics.