High Frequency Transformer Design and Optimization using Bio-inspired Algorithms

Banumathy, Jeyapradha Ravichandran; Veeraraghavalu, Rajini

doi:10.1080/08839514.2018.1506969

Cited by 9 publications

(7 citation statements)

References 11 publications

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“…Nevertheless, this leads to a challenging design of magnetic circuits where parasitic effects play a key role. According to [23,24], most of the proposed designs are based on optimization routines, depending on the temperature rise and assuming uniform heat dissipation. Some authors consider the desired efficiency as a design input for the HFT [24]; otherwise, the optimization is focused on the A p area [25,26].…”

Section: Transformer Modelingmentioning

confidence: 99%

High Frequency Transformers for Solid-State Transformer Applications

et al. 2023

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This paper focuses on the study of the high frequency transformer incorporated in solid- state transformers, specifically on the development of the steps that enable the design of an optimized high frequency transformer and its equivalent model based on the desired characteristics. The impact of operating a transformer at high frequency and the respective solutions that allow this impact to be reduced are analyzed, alongside the numerous advantages that the utilization of these transformers has over traditional 50/60 Hz transformers. Furthermore, the power scheme of the solid-state transformer is outlined, focusing on the power converters, which are immediately before and after the high frequency transformer (HFT). We also investigate a control technique that allows for correct operation and the existence of power bidirectionality. In a novel approach, this paper demonstrates the systematic steps for designing an HFT according to the desired specifications of each given project, helping students and engineers achieve their objectives in power-electronic applications. Moreover, this paper aims at increasing the knowledge of this area of power electronics and facilitating the development of new topologies with high power density, which are very important to the integration of renewable power sources and other applications. Finally, a simulation is presented to validate a high frequency transformer and its control technique.

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Section: Transformer Modelingmentioning

confidence: 99%

High Frequency Transformers for Solid-State Transformer Applications

et al. 2023

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“…This is a lengthy process because whenever an operating parameter violates the bounds, the algorithm hunts for a new optimal solution that satisfies the limits. With all the above concerns in mind, the work reported in [25] was intended to develop a novel optimization procedure for the design of HFT which takes into account the core geometry coefficient (in cm 5 ) [6] with a constraint inflicted on loss density. The method proposed confines all the working parameters within expected limits while preserving desired efficiency.…”

Section: Literature Backgroundmentioning

confidence: 99%

Optimal design of minimal footprint high frequency transformer

Banumathy¹,

Veeraraghavalu²

2021

Serb J Electr Eng

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Transformer design procedure may vary essentially in respect of the transformer type and its operating frequency (ranging between 50/60 Hz and a few megahertz). This paper presents a simple and straightforward method based on the optimal choice of core geometry of a high frequency transformer (HFT) used in Solid State Transformer (SST) applications. The core of SST is the HFT which largely influences its size and overall performance. The proposed design procedure for HFT focuses on optimizing the core geometry coefficient (in cm5) with a constraint inflicted on loss density. The core geometry coefficient has direct impact on the regulation and copper loss and the procedure results in a robust overall design with minimal footprint. Also, the procedure intends to bring all the operating parameters like regulation, losses and temperature rise within permissible limits while retaining desired efficiency. Thus an energy-efficient design is achieved with minimal footprint. The optimization procedure is implemented using recently developed Moth-flame Optimization (MFO) algorithm. The results of the MFO algorithm are compared with the wellestablished PSO technique. An experimental prototype is built to validate the findings.

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“…Equation 14may be considered as the second condition that needs to be satisfied to ensure the minimization of the HFF. Therefore, combining both (10) and (14) leads to the desired sufficient condition for which the HFF may be considered as minimized. Hence, we have,…”

Section: ) Hff Response Of Litz-wire Winding In 200w Lhfgt (Verificamentioning

confidence: 99%

“…In order to utilize the benefit of these A prod and K G CWSS models, researchers have combined these models with brute-force iterative techniques to reduce the number of iterations for obtaining the optimal design. The A prod model has been integrated into the iterative methods proposed in [11], [15], [31]- [36], whereas the K G model has been employed in [14], [37]. Although, these improved techniques with the incorporation of the CWSS models result in a feasible design with reduced iterations, however, the limitations of these conventional A prod and K G models reduce the overall applicability.…”

Section: Introductionmentioning

confidence: 99%

Optimal Area-Product Model (OAPM) Based Non-Iterative Analytical Design Methodology for Litz-Wired High-Frequency Gapped- Transformer (LHFGT) in LLC Converters

Ahmed

Wang

2020

IEEE Access

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In dc-dc LLC resonant converters, the Litz-wired high-frequency gapped-transformer (LHFGT) plays an important role, as it provides the necessary isolation, the required voltage-conversion, and the desired magnetizing inductance (L m) for efficient converter operation. Since the LHFGT makes a significant contribution to the overall converter weight and size, so the converter designers must rely on complicated and advanced optimization techniques, with a large number of iterations, for its design. This dependence is due to the shortcomings in the conventional analytical modeling techniques for optimal sizeselection of the core and winding in the LHFGT. Hence, this manuscript proposes an optimal area-product (A prod) model (OAPM)-based non-iterative LHFGT design methodology that maximizes the efficiency and power density, minimizes the losses and volume, integrates the L m , and maintains the temperature-rise within limits. The method takes into consideration the LLC circuit parameters, the Litz-wire strand-radius (r s), the core material and geometrical parameters, the excitation-waveform shape, the stored energy due to coreairgap, and the peak flux-density (B pk) inside the core. The accuracy improvement is attained through the proposal of accurate A prod-based core-geometry features estimation (ACGFE) models and by keeping in view the interdependency between the transformer-design parameters (TDPs). The optimized design is obtained in a single iteration, based on the proposed OAPM, the proposed optimal r s selection model, and the proposed optimal TDPs' models. The proposed design routine is validated through the analytical and experimental results of a prototype LHFGT for a 200W-110kHz-400VDC/12VDC LLC resonant converter. INDEX TERMS Area-product based core-geometry features estimation (ACGFE) parameters, Litz-wired high-frequency gapped-transformer (LHFGT), LLC resonant converter, optimal area-product model (OAPM), optimal Litz-wire strand-radius selection (LSS) model, optimal transformer-design parameters' models (OTDPMs), optimization.

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High Frequency Transformer Design and Optimization using Bio-inspired Algorithms

Cited by 9 publications

References 11 publications

High Frequency Transformers for Solid-State Transformer Applications

High Frequency Transformers for Solid-State Transformer Applications

Optimal design of minimal footprint high frequency transformer

Optimal Area-Product Model (OAPM) Based Non-Iterative Analytical Design Methodology for Litz-Wired High-Frequency Gapped- Transformer (LHFGT) in LLC Converters

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