Active Saturation Mitigation in High-Density Dual-Active-Bridge DC–DC Converter for On-Board EV Charger Applications

Assadi, Seyed Amir; Matsumoto, Hirokazu; Moshirvaziri, Mazhar; Nasr, Miad; Zaman, Mohammad Shawkat; Trescases, Olivier

doi:10.1109/tpel.2019.2939301

Cited by 68 publications

(23 citation statements)

References 17 publications

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“…Energies 2021, 14, x FOR PEER REVIEW 14 of 22 from auxiliary magnetic cores [45], extra flux density sensors [46], or measurements of the transformer current slopes near the saturation boundaries [47]. The uncut toroidal structure has limited choices for the prevention of saturation in the core.…”

Section: Discussionmentioning

confidence: 99%

“…Transformer core saturation can be passively prevented by adding air gaps [43] or adding a DC-blocking capacitor in series with the primary winding of the transformer [44]. The volt-second imbalance can be actively compensated with a duty offset obtained from auxiliary magnetic cores [45], extra flux density sensors [46], or measurements of the transformer current slopes near the saturation boundaries [47]. The uncut toroidal structure has limited choices for the prevention of saturation in the core.…”

Section: Operating Performance Of the Mf Transformers With The Dab Dc-dc Convertermentioning

confidence: 99%

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Performance Comparison of Ferrite and Nanocrystalline Cores for Medium-Frequency Transformer of Dual Active Bridge DC-DC Converter

et al. 2021

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This article reports an investigation into ferrite and nanocrystalline materials for the medium-frequency transformer of a dual active bridge DC-DC converter, which plays a key role in the converter’s efficiency and power density. E65 MnZn ferrite cores and toroidal and cut nanocrystalline cores are selected for the construction of 20-kHz transformers. Transformer performance is evaluated with a 1.1-kW (42–54 V)/400 V dual active bridge DC-DC converter with single-phase shift and extended phase shift modulations. The experimental results indicate that the toroidal nanocrystalline transformer had the best performance with an efficiency range of 98.5–99.2% and power density of 12 W/cm3, whereas the cut-core nanocrystalline transformer had an efficiency range of 98.4–99.1% with a power density of 9 W/cm3, and the ferrite transformer had an efficiency range of 97.6–98.8% with a power density of 6 W/cm3. A small mismatch in the circuit parameters is found to cause saturation in the nanocrystalline toroidal core, due to its high permeability. The analytical and experimental results suggest that cut nanocrystalline cores are suitable for the dual active bridge DC-DC converter transformers with switching frequencies up to 100 kHz.

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Section: Discussionmentioning

confidence: 99%

Section: Operating Performance Of the Mf Transformers With The Dab Dc-dc Convertermentioning

confidence: 99%

Performance Comparison of Ferrite and Nanocrystalline Cores for Medium-Frequency Transformer of Dual Active Bridge DC-DC Converter

et al. 2021

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“…The phase-shifted DAB converter is one of the most popular bidirectional DC/DC converters in the OBC market [117], [118]. Fig.…”

Section: ) Phase-shifted Dabmentioning

confidence: 99%

A Review of Bidirectional On-Board Chargers for Electric Vehicles

et al. 2021

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The fast development of electric vehicles (EVs) provides significant opportunities to further utilize clean energies in the automotive. On-board chargers (OBCs) are widely used in EVs because of their simple installation and low cost. Limited space in the vehicle and short charging time require an OBC to be power-dense and highly efficient. Moreover, the possibility for EVs to deliver power back to the grid has increased the interest in bidirectional power flow solutions in the automotive market. This paper presents a comprehensive overview and investigation on the state-of-the-art solutions of bidirectional OBCs. It reviews the current status, including architectures and configurations, smart operation modes, industry standards, major components, and commercially available products. A detailed overview of the promising topologies for bidirectional OBCs, including two-stage and single-stage structures, is provided. Future trends and challenges for topologies, wide bandgap technologies, thermal management, system integration, and wireless charging systems are also discussed in this paper.

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“…Dual active bridge (DAB) DC-DC converters, as shown in Fig. 1, is becoming a popular topology in applications such as DC microgrids and distribution networks [1], battery storage systems [2], on-board EV chargers [3], and power electronic transformers [4], due to bidirectional power capability, high power density, electrical isolation, and zerovoltage-switching (ZVS) [5]. A concern in operation is that the isolation transformer may be easily subject to DC bias [6]- [10] because of:…”

Section: ⅰ Introductionmentioning

confidence: 99%

A Fluxgate-Based Current Sensor for DC Bias Elimination in a Dual Active Bridge Converter

Qiu

Feng

et al. 2022

IEEE Trans. Power Electron.

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A concern with the isolation transformer in a dual active bridge (DAB) DC-DC converter is the DC bias in magnetization. This paper proposes a fluxgate-based current sensor to measure the DC component mixed with a large, high-frequency AC current. Compared with a commercial Hall effect current sensor, the proposed sensor significantly reduces measurement error. This paper presents the working principle and design considerations. A prototype is demonstrated for DC bias elimination control in a DAB converter. 1

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Active Saturation Mitigation in High-Density Dual-Active-Bridge DC–DC Converter for On-Board EV Charger Applications

Cited by 68 publications

References 17 publications

Performance Comparison of Ferrite and Nanocrystalline Cores for Medium-Frequency Transformer of Dual Active Bridge DC-DC Converter

Performance Comparison of Ferrite and Nanocrystalline Cores for Medium-Frequency Transformer of Dual Active Bridge DC-DC Converter

A Review of Bidirectional On-Board Chargers for Electric Vehicles

A Fluxgate-Based Current Sensor for DC Bias Elimination in a Dual Active Bridge Converter

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