Browsing by Author "Sabahi, Mehran"

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    High Step-up Common Grounded Switched Quasi Z-Source DC-DC Converter Using Coupled Inductor with Small Signal Analysis
    (IEEE, 2023) Samadian, Ataollah; Marangalu, Milad Ghavipanjeh; Tarzamni, Hadi; Hosseini, Seyed Hossein; Sabahi, Mehran; Mehrizi-Sani, Ali; Department of Electrical Engineering and Automation; Industrial and Power Electronics; University of Tabriz; Virginia Polytechnic Institute and State University
    In this article, a new common grounded switched quasi Z-source DC-DC converter is proposed. In the proposed converter, an additional switch and a diode are used compared to the conventional quasi Z-source converter. The proposed converter provides some benefits by using a coupled inductor and switched capacitor unit. These features are providing voltage-boosting capability using a small range of duty cycles, low voltage stress on semiconductors (switches and diodes), and continuous input current waveform. In this topology, the null of the load is connected to the negative terminal of the input DC source, directly. So, the common mode voltage is kept constant. In this case, the proposed DC-DC converter is suitable for photovoltaic (PV) power generation systems to boost the voltage of PV panels. In this paper, the proposed converter and operation modes are described completely. Also, in order to show the advantages and differences of the proposed topology with other DC-DC high-step up converters, a comparative comparison study is considered. Also, the small signal analysis and control strategy of the proposed converter are provided. In addition, design considerations of the used components are given. Then, the power loss analysis of the converter is provided. Finally, in order to prove the accurate performance of the suggested topology and verify the advantages and analysis, an experimental prototype is built at 250 W output power and the related results are provided.
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    Non-Isolated High Step-Up DC-DC Converters: Comparative Review and Metrics Applicability
    (IEEE, 2024-01) Tarzamni, Hadi; Gohari, Homayon Soltani; Sabahi, Mehran; Kyyra, Jorma; Department of Electrical Engineering and Automation; Industrial and Power Electronics; K.N. Toosi University of Technology; University of Tabriz
    Due to the extensive role of non-isolated high step-up DC-DC converters (NHSDC)s in industrial applications and academic research, many of these pulse width modulation converters have been presented in recent years. For each of these NHSDCs, some claims are introduced to verify its capabilities and features, which has been investigated in some review papers with different frameworks. Dissimilar to previous review papers, which have focused on the classification and derivation of voltage boosting techniques, this paper aims to evaluate the converters from various topological and operational points of view, and determine the superiority of each technique and converter according to applications. Some of these metrics are voltage gain, stresses, ripple, cost, power density, weight, size, control complexity and components count which lead to a comprehensive comparative study. Then, as the main purpose of this paper, effectiveness of these metrics is assessed to show how well they can lead us to the fair comparison results. Moreover, some new figures of merit are proposed in this paper to provide a helpful guideline in power electronic converters comparison studies. Finally, the feasibility discussion of single- and multi-objective figures of merit is followed by general practical conclusion and outlook about the NHSDC structures.
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    Operation and Design Consideration of an Ultra High Step-Up DC-DC Converter featuring High Power Density
    (IEEE, 2021-10-01) Tarzamni, Hadi; Sabahi, Mehran; Rahimpour, Saeed; Lehtonen, Matti; Dehghanian, Payman; Department of Electrical Engineering and Automation; Power Systems and High Voltage Engineering; University of Tabriz; Guilan University; George Washington University
    A new dual-coupled inductor (CI) single-switch high step-up dc-dc topology featuring high power density is proposed in this study. Various capacitive power transfer methods, as well as inductive power transfer techniques, are utilized to act as a more efficient power interface between the input and the load. Three ports in the output terminal are employed to distribute the overall output voltage, diminish the voltage ripple in high-voltage gain ratios, and decrease the voltage stress on the port component. In the proposed converter, first, the voltage gain is high in lower duty cycles of the switching. Second, the stored energy of magnetizing and leakage inductances is recycled in both Cls. Third, the switch voltage spikes are alleviated. Fourth, the operation is done with no circulating current. Fifth, low-size passive components are presented. Sixth, high power density is obtained, and the voltage range is widened. Finally, a simple pulsewidth modulation (PWM) utilizing a wide control range is provided. In this study, the steady-state operation is analyzed under both continuous conduction mode (CCM) and discontinuous conduction mode (DCM), and the performance of the converter is evaluated using comparisons with similar works. In addition, the experimental results have been provided to justify the feasibility of the design.