Optimization of Impedance-Source Galvanically Isolated DC–DC Converters With Reduced Number of Switches

Fakhri, Naser; Naderi, Mohammad Salay; Farkoush, Saeid Gholami; Khoshdel, Adel; Aghili, Soroush; Choi, Seung Kil; Oh, Seung-Ryle; Rhee, Sang-Bong

doi:10.1109/access.2021.3139948

Cited by 8 publications

(4 citation statements)

References 32 publications

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“…In [125] (Figure 17a), the isolated transformer and unique ZSN indicate a suggested converter in terms of its design. A ZSN is constructed of one power switch, a diode, inductors, and capacitors.…”

Section: Impedance Network Cell (Znc)mentioning

confidence: 99%

Topologies and Design Characteristics of Isolated High Step-Up DC–DC Converters for Photovoltaic Systems

Meshael,

Elkhateb,

Best

2023

Electronics

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This paper aims to investigate the state-of-the-art isolated high-step-up DC–DC topologies developed for photovoltaic (PV) systems. This study categorises the topologies into transformer-based and coupled inductor-based converters, as well as compares them in terms of various parameters such as component count, cost, voltage conversion ratio, efficiency, voltage stress, input current ripple, switching mode, and power rating. The majority of the topologies examined exhibit peak efficiencies of 90% to 97%, with voltage conversions in excess of eight, as well as power ratings ranging from 100 W to 2 kW. The existing literature has found that most isolated DC–DC converters increase their turn ratios in order to achieve high step-up ratios. As a result, voltage spikes have increased significantly in switches, resulting in a decrease in overall system efficiency. In this research, the use of passive and active snubbers to provide soft switching in isolated step-up DC–DC converters is investigated. Moreover, a comprehensive analysis of the three most widely used boost techniques is provided. A reduction in turn ratio and a decrease in voltage stress were the results of this process. The main purpose of this study is to provide a comprehensive overview of the most used high-boost isolated DC–DC topologies in PV systems, including flyback, isolated SEPIC, forward, push-pull, half- and full-bridge, and resonant converter, with a focus on the recent research in the field and the recent advancements in these topologies. This study aims to guide further research and analysis in selecting appropriately isolated topologies for PV systems.

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Section: Impedance Network Cell (Znc)mentioning

confidence: 99%

Topologies and Design Characteristics of Isolated High Step-Up DC–DC Converters for Photovoltaic Systems

Meshael,

Elkhateb,

Best

2023

Electronics

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“…One of the renewable energy sources, photovoltaic (PV) energy, has experienced rapid development during the past few decades. PV sources' output power and voltage are variable, nonlinear, and dependent on the surrounding temperature, solar radiation levels, and load values 1 . To connect the PV sources to the electricity grid and obtain the maximum energy possible from these sources under different operating conditions, high step-up voltage DC/DC converters with greater efficiency are used to emphasize the right tracking of the maximum power and lift the low PV voltage level to proper DC levels needed for inverters 2 .…”

Section: Introductionmentioning

confidence: 99%

A new extended single-switch high gain DC–DC boost converter for renewable energy applications

Mansour

Zaky

2023

Sci Rep

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High-gain DC/DC converters are considered one of the most important components of green energy systems. Large numbers of these converters are used for increasing the voltage gain by using an extreme duty cycle. However, it increases losses and the cost, degrades the system performance, and hence obtains a low efficiency. In this article, a new design of a high-gain DC/DC boost converter is proposed. This converter has the potential to be used in low input voltage applications that need a high voltage gain such as systems powered by solar photovoltaic panels and fuel cells. The new topology is characterized by its simplicity of operation, high voltage gain, better efficiency, continuity of the input current, reduced number of inductors and capacitors, and can be extended to get higher gains. The converter structure, principle of operation, and design consideration of inductors and capacitors are presented in detail. Derivation of power losses and efficiency is presented. A laboratory prototype is implemented, and various experimental tests are given. The achievement of the suggested design is confirmed and compared with other recent high-gain converters.

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“…Due to the pursuit of power density in converters, high-frequency converters usually need to solve switching losses and other issues. Therefore, high-frequency switches must achieve soft switching, and DC/DC converters with soft switching characteristics are gradually receiving attention [4,5]. Converters with bi-directional energy flow topologies are numerous while the topologies that guarantee high efficiency are limited.…”

Section: Introductionmentioning

confidence: 99%

An Input-Series-Output-Parallel Cascaded Converter System Applied to DC Microgrids

Wang

Wei

et al. 2023

Symmetry

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Direct current transformer (DCT) is a key piece of equipment in direct current (DC) microgrids, and the mainstream topologies mainly include LLC resonant converter (LLC) and dual active bridge (DAB). In this paper, a novel bi-directional buck/boost + CLLLC cascade topology is proposed for the input-series-output-parallel cascade converter system of a DC microgrid. To solve the problem that frequency variation causes the converter to deviate from the optimal operating point, resulting in low efficiency, and the inability to achieve a soft switching function. The CLLLC converter operates near the resonant frequency point as a DCT, only providing electrical isolation and voltage matching, while the buck/boost converter controls the output voltage and the voltage and current sharing of each module. Compared to other cascaded converter systems, the cascaded converter proposed in this paper has high efficiency, simplifies the parameter design, and is suitable for wide input and wide output operating conditions. The system adopts a three-loop control strategy, establishes the small-signal modeling of the system, and its stability is verified by theoretical analysis and simulation. The simulation and experimental results verify the correctness of the proposed cascaded converter based on buck/boost + CLLLC and the effectiveness of the control strategy.

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Optimization of Impedance-Source Galvanically Isolated DC–DC Converters With Reduced Number of Switches

Cited by 8 publications

References 32 publications

Topologies and Design Characteristics of Isolated High Step-Up DC–DC Converters for Photovoltaic Systems

Topologies and Design Characteristics of Isolated High Step-Up DC–DC Converters for Photovoltaic Systems

A new extended single-switch high gain DC–DC boost converter for renewable energy applications

An Input-Series-Output-Parallel Cascaded Converter System Applied to DC Microgrids

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