A New Optimization Method for Gapped and Distributed Core Magnetics in LLC Converter

Lordoglu, Abdulsamed; Gülbahçe, Mehmet Onur; Kocabaş, Derya Ahmet; Dusmez, Serkan

doi:10.1109/access.2023.3242869

Cited by 6 publications

(3 citation statements)

References 31 publications

(45 reference statements)

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“…The power loss includes core loss, temperature dependent copper loss, and AC winding loss due to the skin effect. More information on the magnetic design for gapped cores can be found in [25].…”

Section: Transformer and Resonance Inductor Designmentioning

confidence: 99%

A Holistic Design Optimization Method for LLC Converters in Light Electric Vehicle Chargers

Lordoglu¹,

Gülbahçe²,

Kocabaş³

et al. 2024

IEEE Trans. Transp. Electrific.

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The passive components of LLC resonance converters are traditionally designed based on a resonance frequency and switching frequency range considering required voltage conversion rate while ensuring zero-voltage-switching of the primary side power devices. Afterwards, the sub-elements such as transformer, power stage, and heat-sink are locally designed. However, this may only lead to locally optimized designs. In this paper, a systematic design framework is proposed that attempts to determine the resonance frequency by considering non-linear battery load profile, power loss, volume and cost of all main components. To achieve smaller sized transformer, a series connected primary and parallel connected secondary windings with a multi-core configuration is also considered. The proposed algorithm aids designers to optimally size the LLC, and provides a step-by-step design methodology. An LLC stage of a light electric vehicle battery charger converting 370 V-430 V to an output voltage range of 36 V-54 V rated at 3700 W with a peak efficiency of 98.2% has been designed validating the proposed design procedure.

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Section: Transformer and Resonance Inductor Designmentioning

confidence: 99%

A Holistic Design Optimization Method for LLC Converters in Light Electric Vehicle Chargers

Lordoglu¹,

Gülbahçe²,

Kocabaş³

et al. 2024

IEEE Trans. Transp. Electrific.

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“…The DM filter size, boost inductor volume, and inductor power loss variations with respect to switching frequency variations are shown in Fig. 10 for CCM TP PFC variants, where the inductors are designed using the framework presented in [24]. According to this, the inductor design is optimized based on volume and losses.…”

Section: B Dm Filter and Boost Inductor Volume Comparisons Of Ccm Tp ...mentioning

confidence: 99%

A Unified Differential Mode Noise Estimation Method and Filter Size Comparison in Single-Phase Multileg and Multilevel Totem-Pole PFC Converters

Tausif

Dusmez²

2023

IEEE Trans. Power Electron.

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Wide-bandgap power devices have enabled singlephase totem-pole (TP) power factor correction (PFC) converter designs to be switched at several tens of kilohertz under hardswitching and hundreds of kilohertz under soft-switching. It is straightforward to analyze and compare the volume of boost inductor for TP PFC converters having multileg and multilevel configurations operating under continuous-conduction-mode (CCM) and critical-conduction-mode (CrM) at various switching frequencies; however, the impact of topology and switching frequency selections remains unchallenged for generated differential mode (DM) noise. This article proposes a unified and generalized DM noise estimation method for multileg, and multilevel TP PFC converters operated under both CCM and CrM operation modes. The method has been verified with simulation results obtained from various TP PFC topologies, as well as experimental results obtained from singleleg CCM and 4-Level CCM TP PFC converters. The empirically determined boxed sizes of DM filters have been compared among various TP PFC topologies, and the best switching frequency for each topology has been determined with the integration of boost inductor volume comparison.

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“…For example, a study detailed in [15] presents a systematic design framework for LLC converters that optimizes resonance frequency and switching frequency limits, ensuring required voltage gains across various quality factors. Similarly, [16] introduces a design tool for gapped core magnetics in LLC converters, selecting the optimal magnetic flux density by minimizing a fitness function that encompasses power loss, cost, and volume, leveraging the Big-Bang Big-Crunch Algorithm.…”

Section: Introductionmentioning

confidence: 99%

Meta-Heuristics Based Design and Optimization of Active Clamp Flyback Converter for USB PD

Aydin,

Lordoglu,

Lordoglu

et al. 2024

IEEE Access

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The escalating demand for small, compact, and economical consumer electronics necessitates efficient power conversion at higher switching frequencies. The active-clamp flyback (ACF) converter, offering isolation, efficient performance at low and medium power levels, and cost and volume efficiency, is frequently employed in consumer electronics, including USB PD devices. However, designing and selecting components for the ACF converter remains a challenging task, particularly for fast charging and USB-PD standards. This paper introduces a comprehensive design and optimization methodology for the ACF converter under constraints of power loss, volume, and efficiency. This methodology employs the particle swarm optimization algorithm, a nature-inspired optimization technique. The proposed design and optimization algorithm provides a detailed design process and aids designers in determining the optimal size of the ACF converter. The optimization algorithm orchestrates the circuit design by selecting design parameters within a certain frequency range, utilizing transformer, switches, and diode elements from the database. In consideration of the requirement for high-frequency operation, the database also includes GaN semiconductor switches and high-frequency operated magnetic components. The design presenting the highest benefits in terms of volume, cost, and losses is selected using the converter level fitness function, which incorporates cost, volume, and loss considerations. To evaluate the proposed design and optimization methodology, a USB PD converter capable of providing 5V/9V/15V/20V DC voltages (max. 65W) from a 230 VAC/50 Hz supply was designed and its performance analyzed.INDEX TERMS Active clamp, active clamp flyback circuit, nature-inspired optimization techniques, particle swarm optimization, synchronous rectifier, USB PD.

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A New Optimization Method for Gapped and Distributed Core Magnetics in LLC Converter

Cited by 6 publications

References 31 publications

A Holistic Design Optimization Method for LLC Converters in Light Electric Vehicle Chargers

A Holistic Design Optimization Method for LLC Converters in Light Electric Vehicle Chargers

A Unified Differential Mode Noise Estimation Method and Filter Size Comparison in Single-Phase Multileg and Multilevel Totem-Pole PFC Converters

Meta-Heuristics Based Design and Optimization of Active Clamp Flyback Converter for USB PD

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