A New High Voltage Gain Transformer-Less Step-Up DC–DC Converter With Double Duty-Cycles: Design and Analysis

Imanlou, Arash; Behkam, Reza; Nadermohammadi, Ali; Nafisi, Hamed; Heydari-Doostabad, Hamed; Gharehpetian, Gevork B.

doi:10.1109/access.2024.3425724

IEEE Access

2024

DOI: 10.1109/access.2024.3425724

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A New High Voltage Gain Transformer-Less Step-Up DC–DC Converter With Double Duty-Cycles: Design and Analysis

Arash Imanlou,

Reza Behkam,

Ali Nadermohammadi

et al.

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2024

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Cited by 6 publications

References 55 publications

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A New High Voltage Gain Common‐Ground Step‐Up DC‐DC Converter Integrating Coupled‐Inductors and Switched‐Capacitors

Imanlou,

Babaei,

Hosseini

2024

Circuit Theory & Apps

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This study proposes a new high‐voltage gain quadratic‐structured common‐ground step‐up DC‐DC converter, integrating coupled‐inductors and switched‐capacitors. This configuration achieves a significant voltage gain without necessitating either a substantial duty cycle or an elevated turn ratio in the coupled‐inductors. A critical innovation is the embedding of the secondary windings of the coupled‐inductors into the switched‐capacitor cell, which not only enhances voltage gain but also effectively suppresses the inrush current typical in such cells. The converter's features include the successful recycling of energy from the leakage inductors; low voltage stress exerted on power switches; zero‐current switching (ZCS) turn‐on of the main switch; ZCS conditions for the diodes' turn‐off; reduced switching losses because of the application of a quasi‐resonant (QR) operation between the leakage inductors and middle capacitors; simultaneous operation of the power switches; continuous input current; a wide duty cycle range; and a common‐ground output–input connection. The operating principle, steady‐state analysis (CCM and DCM), design considerations, efficiency calculation, small‐signal modeling with controller design, and comparisons with other related converters are provided. Finally, experimental results from a 100‐ to 300‐W prototype with 20‐ to 30‐V input and 400‐V output are given to validate the proposed converter's theoretical analysis and feasibility.

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A New High Voltage Gain Common‐Ground Step‐Up DC‐DC Converter Integrating Coupled‐Inductors and Switched‐Capacitors

Imanlou,

Babaei,

Hosseini

2024

Circuit Theory & Apps

View full text Add to dashboard Cite

show abstract

Cost-effective soft-switching ultra-high step-up DC–DC converter with high power density for DC microgrid application

Nadermohammadi,

Abolhassani,

Seifi

et al. 2024

Sci Rep

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DC microgrids are integral to smart grids, enhancing grid reliability, power quality, and energy efficiency while enabling individual grid independence. They combine distributed and renewable energy sources, reducing overall energy consumption. High-gain DC–DC converters are crucial for elevating voltages from low-voltage DC sources like solar panels and wind turbines in DC microgrids. This paper introduces a non-isolated DC–DC converter designed to achieve ultra-high step-up (UHSU) voltage conversion utilizing a two-winding coupled inductor (CI). The propounded UHSU configuration achieves a substantial voltage increase by employing low duty cycles and a decreased turn ratio for the CI, resulting in a smaller core size. Moreover, this UHSU circuit incorporates soft-switching capabilities for both power switches and diodes, enhancing its efficiency. By keeping the voltage stress on the switches low, the design minimizes losses and improves overall efficiency. The operational modes are thoroughly analyzed, and comparisons with other topologies are presented to demonstrate the effectiveness of the proffered UHSU circuit. Finally, the performance of the UHSU circuit is validated through the construction and testing of a 150-W laboratory prototype operating at a switching frequency of 50 kHz, with Vin = 20 V and Vout = 300 V.

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A high voltage gain solid-state transformer for integration of renewable energy and AC sources

Hashemzadeh,

Al-Hitmi,

Islam

et al. 2024

Sci Rep

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This paper introduces a novel high-voltage gain topology for a solid-state transformer, integrating a DC-DC converter and dual active bridge converters. The proposed design features three DC links operating at different voltage levels. The first DC link connects to a single-switch high step-up DC-DC converter, while the second DC link interfaces with an AC source via a rectifier, allowing the use of both DC and AC inputs. A high-frequency transformer ensures galvanic isolation between the sources and the third DC link. The DC-DC converter employs coupled inductors and voltage multiplier cells, offering distinct advantages such as a high voltage gain, reduced voltage stress on semiconductors, and minimized current ripple. These features make the topology highly suitable for transferring power from renewable energy sources, such as photovoltaic panels, to a high-voltage DC link in microgrid or nanogrid applications. The novelty lies in the combination of multiple voltage levels, high-frequency isolation, and the ability to handle both DC and AC inputs efficiently. An experimental prototype, delivering 620 W with a 25 V DC input and 110 V AC input, is built, and the results validate the converter’s effectiveness.

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A New High Voltage Gain Transformer-Less Step-Up DC–DC Converter With Double Duty-Cycles: Design and Analysis

Cited by 6 publications

References 55 publications

A New High Voltage Gain Common‐Ground Step‐Up DC‐DC Converter Integrating Coupled‐Inductors and Switched‐Capacitors

A New High Voltage Gain Common‐Ground Step‐Up DC‐DC Converter Integrating Coupled‐Inductors and Switched‐Capacitors

Cost-effective soft-switching ultra-high step-up DC–DC converter with high power density for DC microgrid application

A high voltage gain solid-state transformer for integration of renewable energy and AC sources

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