A Multiphysics Design and Optimization Method for Air-Core Planar Transformers in High-Frequency <i>LLC</i> Resonant Converters

Ho, Godwin Kwun Yuan; Fang, Yaoran; Pong, M.H.

doi:10.1109/tie.2019.2910023

Cited by 31 publications

(14 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Ultimately, the multi-physics approach to design optimization aims at intelligently coupling the most relevant physical domains, typically including transport phenomena, full-wave electromagnetics (EM), electrical, thermal and mechanical domains. Pioneering work on multiphysics optimization of RF and microwave circuits has been reported [86]- [90]. Manufacturability assessment, statistical design and yield optimization of high-frequency structures considering high-fidelity multi-physical performance is still absent in the scientific literature.…”

Section: Space Mapping Machine Learning and Bayesian Approachesmentioning

confidence: 99%

Advanced RF and Microwave Design Optimization: A Journey and a Vision of Future Trends

2021

View full text Add to dashboard Cite

Section: Space Mapping Machine Learning and Bayesian Approachesmentioning

confidence: 99%

Advanced RF and Microwave Design Optimization: A Journey and a Vision of Future Trends

2021

View full text Add to dashboard Cite

“…The P t can be represented in terms of the total thermal loss due to convection (P TH ) using Newton's law of cooling [44] as, P t = P fe + P cu = P TH = h t T r A srf (16) where, h t is the coefficient of heat-transfer (typically 10W / (m 2• C) for natural-convection). By using (3) to (5) in (16), V t can be represented in terms of P t as follows,…”

Section: ) the Optimality Conditionmentioning

confidence: 99%

“…The analytical model (25) can be made independent of the GFs by incorporating the ACGFE models (4) and (5) in (25) as follows: Equation 25is the proposed OCDM, based on the optimality condition (23), the ACGFE models, the core material parameters, the A prod value, and the T r limit, subject to the optimal LSS criteria (15).…”

Section: ) the Optimal J W Model (Ocdm)mentioning

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

View full text Add to dashboard Cite

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.

show abstract

“…batteries and wireless chargers, are included in the design optimization problem. New components will require the design process to learn new design guidelines to achieve an optimal solution appropriately (Ho et al, 2019;Mogorovic and Dujic, 2019). Therefore, discovering the associated knowledge should be considered as the major stage of any design process (Muller et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…Regarding the design requirements determined by the designer, a set of objectives can be defined and used for optimizing the device structure. However, dealing with the optimization is not the focus here, as different optimization techniques are available in the literature (Zhao et al, 2006;Ho et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Design concepts of low-frequency electromagnetic devices based on a data-driven approach

Ghorbanian

Mohammadi

Lowther

2019

COMPEL

View full text Add to dashboard Cite

PurposeThis paper aims to propose a data-driven approach to determine the design guidelines for low-frequency electromagnetic devices.Design/methodology/approachTwo different devices, a core-type single-phase transformer and a motor-drive system, are used to show the usefulness and generalizability of the proposed approach. Using a finite element solver, a large database of design possibilities is created by varying design parameters, i.e. the geometrical and control parameters of the systems. Design rules are then extracted by performing a statistical analysis and exploring optimal and sub-optimal designs considering various targets such as efficiency, torque ripple and power factor.FindingsIt is demonstrated that the correlation of the design parameters influences the way the data-driven approach must be made. Also, guidelines for defining new design constraints, which can lead to a more efficient optimization routine, are introduced for both case studies.Originality/valueUsing the proposed approach, new design guidelines, which are generally not obtainable by the classical design methods, are introduced. Also, the proposed approach can potentially deal with different parameter–objective correlations, as well as different number of connected systems. This approach is applicable regardless of the device type.

show abstract

A Multiphysics Design and Optimization Method for Air-Core Planar Transformers in High-Frequency LLC Resonant Converters

Cited by 31 publications

References 19 publications

Advanced RF and Microwave Design Optimization: A Journey and a Vision of Future Trends

Advanced RF and Microwave Design Optimization: A Journey and a Vision of Future Trends

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

Design concepts of low-frequency electromagnetic devices based on a data-driven approach

Contact Info

Product

Resources

About