Asymmetric Phase-Shift Modulation Strategy of DAB Converters for Improved Light-Load Efficiency

Chen, Gen; Chen, Zhangyong; Chen, Yong; Feng, Chenchen; Zhu, Xintong

doi:10.1109/tpel.2022.3157375

Cited by 20 publications

(5 citation statements)

References 28 publications

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“…As an alternative to the symmetrical modulation methods explained above, by bringing another degree of freedom to the modulator, recently a few asymmetrical modulation methods have been proposed [144,147]. In [147], the duty cycle of the low-voltage side is fixed at 50%, while the other side is operated at a lower duty cycle without following the half wave symmetry. Reportedly, the proposed approach has better ZVS performance, although full ZVS operation is not possible when compared to SPS, DPS, and EPS modulation methods under light load.…”

Section: • Dab Modulation Methodsmentioning

confidence: 99%

A Comprehensive Review of GaN-Based Bi-directional On-Board Charger Topologies and Modulation Methods

et al. 2023

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The wide-scale adoption and accelerated growth of electric vehicle (EV) use and increasing demand for faster charging necessitate the research and development of power electronic converters to achieve high-power, compact, and reliable EV charging solutions. Although the fast charging concept is often associated with off-board DC chargers, the importance of on-board AC fast charging is undeniable with the increasing battery capacities. This article comprehensively reviews gallium nitride (GaN) semiconductor-based bidirectional on-board charger (OBC) topologies used in both 400 V and 800 V EV applications. Moreover, comparative evaluations of GaN-based bi-directional OBC topologies regarding power conversion losses (conduction loss and soft switching capabilities), power density, implementation considerations, power quality, electromagnetic interference, and reliability aspects have been presented. The status of commercially available GaN power modules, advancements in GaN technology, applicable industry standards, and application requirements for OBCs have been also included in this study. Finally, in light of forthcoming advancements in GaN power transistor technology, this study highlights potential areas of research related to the reviewed topologies. Such research can aid researchers and designers in improving the performance and user experience of electric vehicles, ultimately supporting the widespread adoption of EVs.

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Section: • Dab Modulation Methodsmentioning

confidence: 99%

A Comprehensive Review of GaN-Based Bi-directional On-Board Charger Topologies and Modulation Methods

et al. 2023

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“…By optimizing both the internal phase shifts and the voltage phase shifts, it is possible to improve efficiency, improve voltage gain, and lower transformer loss. In [155], the asymmetric phase shift (APS) method is presented and the light load efficiency is improved significantly. In [156], the double band peak current control method is used to improve the light-load efficiency by extending the ZVS range.…”

Section: Dab Convertermentioning

confidence: 99%

A Review of DC Fast Chargers with BESS for Electric Vehicles: Topology, Battery, Reliability Oriented Control and Cooling Perspectives

et al. 2023

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The global promotion of electric vehicles (EVs) through various incentives has led to a significant increase in their sales. However, the prolonged charging duration remains a significant hindrance to the widespread adoption of these vehicles and the broader electrification of transportation. While DC-fast chargers have the potential to significantly reduce charging time, they also result in high power demands on the grid, which can lead to power quality issues and congestion. One solution to this problem is the integration of a battery energy storage system (BESS) to decrease peak power demand on the grid. This paper presents a review of the state-of-the-art use of DC-fast chargers coupled with a BESS. The focus of the paper is on industrial charger architectures and topologies. Additionally, this paper presents various reliability-oriented design methods, prognostic health monitoring techniques, and low-level/system-level control methods. Special emphasis is placed on strategies that can increase the lifetime of these systems. Finally, the paper concludes by discussing various cooling methods for power electronics and stationary/EV batteries.

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“…In addition, asymmetric phase-shift modulation with a non-50% duty cycle of the drive signals has been used to increase the degree of freedom of DAB control [25]. In [26], an asymmetric duty cycle and internal phase-shift modulation method is proposed to eliminate the backflow power at a light load.…”

Section: Introductionmentioning

confidence: 99%

A Collaborative Modulation Method of Dual-Side Backflow Power Optimization and Zero-Voltage Switching for Dual Active Bridge

Zhang,

Liu,

et al. 2024

Energies

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Dual active bridge (DAB) converters are widely used in DC microgrids because of their superior bidirectional energy flow regulation capability and characteristics, such as wide voltage gain and zero-voltage switching (ZVS). However, due to the inherent contradiction between the minimum backflow power and the ZVS of the power switches, the existing modulation methods are difficult to optimize and coordinate. Most of the studies increase the complexity of energy flow regulation in the optimization process. To solve the above problems, this paper proposes a collaborative modulation method of dual-side backflow power optimization and ZVS for DAB. The method constructs a dual-side backflow power optimization modulation strategy that is simple to control and uniform in all working conditions by analyzing the mathematical model of backflow power. Meanwhile, based on this optimized modulation strategy, a regulatory factor of phase-shift ratio is introduced to collaborate with the ZVS of the power switches, which reduces the backflow power while ensuring the ZVS of the primary and secondary sides. Finally, a 500W DAB prototype is built, and the experimental results verify the feasibility and effectiveness of the proposed modulation method.

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Asymmetric Phase-Shift Modulation Strategy of DAB Converters for Improved Light-Load Efficiency

Cited by 20 publications

References 28 publications

A Comprehensive Review of GaN-Based Bi-directional On-Board Charger Topologies and Modulation Methods

A Comprehensive Review of GaN-Based Bi-directional On-Board Charger Topologies and Modulation Methods

A Review of DC Fast Chargers with BESS for Electric Vehicles: Topology, Battery, Reliability Oriented Control and Cooling Perspectives

A Collaborative Modulation Method of Dual-Side Backflow Power Optimization and Zero-Voltage Switching for Dual Active Bridge

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