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    A borohydride/peroxide fuel cell-Li-ion battery hybrid system controlled with a maximum peak power tracking algorithm
    (Pergamon-Elsevier Science Ltd, 2015) Yilmaz, Eyup; Canan, Belkis; Sanli, Ayse Elif; Mat, Mahmut D.; Gunlu, Goksel
    The present study was carried out to develop a direct borohydride/peroxide fuel cell (DBPFC)/Li-ion battery hybrid system. In the system, the battery was charged with DBPFC. The output power of the DBPFC was controlled by a MPPT algorithm. It consists of two main parts: a DC/DC converter and a DSP controller. TMS320F28027 DSP was used to manage the entire MPPT circuit. The DC/DC controller was placed between the fuel cell and the battery. The performance test results indicated that the output power remained constant at 1.3 W during the test. Moreover, the voltage ripples that are generally observed in the fuel cells were prevented. The fuel cell provided the power at the maximum peak power for approximately 211 min. It was obvious that the Li-Ion battery was charged with a stable DBPFC power. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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    Comparison of Power and Energy Density after Full Shunting-Balancing in Serial Connected Lithium-ion Batteries and Serial-Connected Supercapacitors
    (Ieee, 2015) Sertkaya, Melek Gulatik; Yilmaz, Eyup; Sanli, Ayse Elif; Gunlu, Goksel
    In this study, advantages and disadvantages of supercapacitors and batteries which are energy storing sources were examined and furthermore, energy density, voltage and current behaviors of 6 serial connected supercapacitors and 6 serial connected battery sequences were compared. While establishing these circuits, full shunting balancing methods were used. When 4 units of 6 serial connected batteries/supercapacitors reached to the 100% charged level, system passed to discharging mode from charging mode and total charge ratios of the systems were calculated.