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32 results on '"Mostaan, Ali"'

2. A Symmetric Bipolar Quadratic Buck–Boost Converter With Synchronous Triple Switches

Author

Mostaan, Ali, Esmaeili, Soroush, Hasanpour, Sara, Bakhshandeh Taleshani, Talieh, and Ali Khan, Ashraf

Abstract

A novel nonisolated bipolar dc–dc converter is described in this study. The proposed converter provides negative and positive outputs with the same voltage level and common ground. It exploits three power switches with the synchronous operation, resulting in a simple controller and driver implementation. Compared with the conventional counterpart dc–dc converters, the proposed converter offers buck–boost ability with a wide control range of the switching duty cycle. Additionally, the proposed converter draws a continuous and smooth current from the dc input source, making it an excellent choice for renewable energy sources and energy storage systems. Likewise, the proposed quadratic converter can provide a higher voltage boost ability with the same switching duty cycle compared to the existing transformerless bipolar converters. Hence, it offers lower conduction losses and higher efficiency for the same demanded output voltages. Theoretical analysis and experimental results based on a sample prototype are presented to prove the proposed converter's performance in continuous conduction mode (CCM) mode.

Published
2023
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8. High-Voltage Gain Quasi-SEPIC DC–DC Converter

Author

Siwakoti, Yam P., primary, Mostaan, Ali, additional, Abdelhakim, Ahmed, additional, Davari, Pooya, additional, Soltani, Mohsen N., additional, Khan, Md. Noman Habib, additional, Li, Li, additional, and Blaabjerg, Frede, additional

Published
2019
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21. Non-isolated buck-boost dc-dc converter with quadratic voltage gain ratio.

Author

Gorji, Saman A., Mostaan, Ali, Hung Tran My, and Ektesabi, Mehran

Abstract

A new transformer-less buck-boost converter is proposed, which owns a quadratic voltage gain ratio. The proposed converter (a) has only one active switch, which makes the implementation of the gate driver and control system simpler; (b) has a quadratic voltage gain without using a transformer, which equips the designers to obtain a high-voltage gain ratio and avoid the complexity of magnetic utilisations; (c) works both in step-up or step-down mode, while most of the existing quadratic topologies are able to work either in step-up or step-down mode; and (d) shares a common ground between the input and output terminals. The operating states of the proposed converter along with its steady-state performance are analysed. Then, the small-signal modelling and the power loss analysis are performed. A comparison shows the unique features of the converter, specifically in terms of voltage gain ratio and the count of power switches. Finally, the experimental results of a laboratory prototype, as well as the simulation results from PSIM software, are used for validation. The converter was tested in different conditions to inspect its transient response and to record its efficiency. The maximum recorded efficiencies in boost and buck modes, respectively were 94.7 and 93%. [ABSTRACT FROM AUTHOR]

Published
2019
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32. Dual Winding Magnetically Coupled Impedance-Source Inverters with DC-Rail Voltage Clamping Circuits

Author

Solmaz Kahourzade, Ali Mostaan, Soroush Esmaeili, Amin Mahmoudi, Esmaeili, Soroush, Mahmoudi, Amin, Kahourzade, Solmaz, Mostaan, Ali, and 2021 IEEE 12th Energy Conversion Congress & Exposition-Asia (ECCE-Asia) Online, Singapore 24-27 May 2021

Subjects
Leakage inductance, Materials science, business.industry, Electrical engineering, clamping circuit, High voltage, leakage inductance, Inductor, Inrush current, high voltage applications, law.invention, law, Inverter, business, Transformer, high frequency loop, Electrical impedance, Voltage
Abstract

This paper presents a class of high step-up impedance source inverters. The proposed topologies utilize an optimized coupled transformer with unique structure to reach high voltage boost capability with small turns ratio. In other words, high voltage boost ability is gained by decreasing the turns ratio to 1 which leads to lower cost and volume. The absorbing circuits are exploited to clamp dc-link voltage to reduce the effect of the leakage inductance. So, huge spikes across the inverter bridge are removed effectively. Input inductor and input dc-source are connected in series. It results in continuous input current with low start-up inrush current which is appropriate for renewable energy sources such as fuel cell and photovoltaic (PV). In addition, high output voltage is obtained with small shoot-through (ST) duty ratio and high modulation ratio which causes semiconductor voltage stress reduction and better quality of the output voltage. The simulation results confirm the operation of the introduced inverters. The paper also extracts the mathematical equations of the proposed inverter Refereed/Peer-reviewed

Published
2021

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