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    A Battery-connected Switched-Capacitor-based Power Step-Up Converter for V2G Applications
    (Institute of Electrical and Electronics Engineers Inc., 2023) Tekin, Hakan; Setrekli, Göknur; Murtulu, Eren; Karşıyaka, Hikmet; Ertekin, Davut
    In this study, a novel power boost converter topology, which is characterized by a single-switch configuration and its connection to a battery, is introduced. The primary objective of this study is to explore its suitability for voltage enhancement in electrification transportation systems. An intrinsic advantage of the proposed converter lies in its ability to provide a continuous current output with a constrained magnitude, consequently reducing peak values on the battery input side current as a critical parameter impacting battery reliability and longevity. Furthermore, the gain achieved by this novel converter is substantial, rendering it a viable choice for high-voltage Vehicle-to-Grid (V2G) applications.Unlike traditional boost converters, which usually produce an output voltage twice that of the input voltage with a duty cycle of 0.5, the suggested converter exceeds this by providing an output voltage five times higher than the input voltage. The validity of the theoretical framework is substantiated through mathematical derivations and simulation outcomes. To control the proposed converter effectively, a fuzzy logic controller is employed, chosen for its suitability in managing nonlinear systems and its simplicity of implementation. © 2023 IEEE.
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    A Proposed Single-Input Multi-Output Battery-Connected DC-DC Buck-Boost Converter for Automotive Applications
    (Mdpi, 2023) Tekin, Hakan; Setrekli, Goknur; Murtulu, Eren; Karsiyaka, Hikmet; Ertekin, Davut
    In the realm of electric vehicles (EVs), achieving diverse direct current (DC) voltage levels is essential to meet varying electrical load demands. This requires meticulous control of the battery voltage, which must be adjusted in line with specific load characteristics. Therefore, the integration of a well-designed power converter circuit is crucial, as it plays a pivotal role in generating different DC voltage outputs. In this study, we also consider the incorporation of two additional doubler/divider circuits at the end of the proposed converter, further enhancing its capacity to produce distinct DC voltage levels, thus increasing its versatility. The standout feature of the proposed converter lies in its remarkable ability to amplify DC voltages significantly. For instance, when the input battery voltage is set at 48 VDC with a duty cycle (D) of 0.8, the resulting output demonstrates a remarkable augmentation, producing voltages 18, 36, and 72 times higher than the input voltage. Conversely, with a reduced D of 0.2 while maintaining the input voltage at 48 VDC, the converter yields diminished voltages of 0.1875, 0.375, and 0.75 times the initial voltage. This adaptability, based on the parameterization of D, underscores the converter's ability to cater to a wide range of voltage requirements. To oversee the intricate operations of this versatile converter, a high-speed DSP-based controller system is employed. It utilizes the renowned PID approach, known for its proficiency in navigating complex, nonlinear systems. Experimental results validate the theoretical and simulation findings, reaffirming the converter's practical utility in EV applications. The study introduces a simple control mechanism with a single power switch, high efficiency for high-power applications, wide voltage range, especially with VDC and VMC cells, and continuous current operation for the load in CCM mode. This study underscores the significance of advanced power conversion systems in shaping the future of electric transportation.