A Multi-Active-Half-Bridge Converter based Soft-switched Fast Voltage Equalizer for Multi-cell to Multi-cell Charge Transfer

Dam, Shimul Kumar

doi:10.1109/itec-india48457.2019.itecindia2019-176

Cited by 6 publications

(10 citation statements)

References 12 publications

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“…2(a). This equalizer topology is selected due to its capability of equalizing all cells simultaneously and maintaining almost constant cell current levels throughout the equalization duration to achieve fast cell balancing [28]. It also has inherent soft-switching, allowing a high switching frequency design with small passives.…”

Section: Proposed Modularization Methodsmentioning

confidence: 99%

“…4) Modularized control structure, eliminating the need for controller redesign. The details of the proposed modularization method are explained in Section II, utilizing a transformer-less equalizer [28]. Section III introduces a modularized control structure, while Section IV compares the proposed method with existing approaches.…”

Section: Inter-cell Equalizermentioning

confidence: 99%

“…The operating principle and control strategy of the equalizer in Fig. 2(a) are discussed in detail in [28] and summarized here. The equalizer has one half-bridge, two capacitors, and one inductor connected to each cell.…”

Section: A Operation and Control Of Equalizer Modulementioning

confidence: 99%

“…The signal S ch lags S dis by a predetermined phase that is selected to achieve the required equalization current level. The peak current in inductor L i is given by [28],…”

Section: A Operation and Control Of Equalizer Modulementioning

confidence: 99%

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A Direct Modularization Method for Multi-cell to Multi-cell Equalizer with Large Cell Count

Dam,

John

2023

Preprint

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<p>A modular voltage equalizer can be used in a wide variety of applications without changing the module design. However, the modularization of an equalizer topology often involves slow inter-module equalization, additional energy loss, and cost. A study on available modularization techniques shows that the transformer-based equalizers offer simple and low-cost modularization methods. Conversely, the transformer-less equalizers can offer more compact design, but their modularization methods suffer from either high complexity and loss, or slow inter-module equalization speed. In this work, one two-winding transformer is introduced into a transformer-less equalizer module to leverage the modularization benefits of transformer isolation while still achieving a more compact design than transformer-based equalizers. The proposed direct modularization method achieves fast inter-module equalization and fixed design for a variety of applications with a small increase in cost and size. The proposed method is implemented on a transformer-less equalizer and its effectiveness is validated experimentally with a three-module prototype.</p>

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Section: Proposed Modularization Methodsmentioning

confidence: 99%

Section: Inter-cell Equalizermentioning

confidence: 99%

Section: A Operation and Control Of Equalizer Modulementioning

confidence: 99%

“…The signal S ch lags S dis by a predetermined phase that is selected to achieve the required equalization current level. The peak current in inductor L i is given by [28],…”

Section: A Operation and Control Of Equalizer Modulementioning

confidence: 99%

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A Direct Modularization Method for Multi-cell to Multi-cell Equalizer with Large Cell Count

Dam,

John

2023

Preprint

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“…A resonant tank can be used to reduce the voltage oscillations within the circuit as shown in [26]. Furthermore, the resonant tank can be used to increase the balancing speed of the DC-voltages of the MAB which was presented for battery balancing in [27] . In [28], the authors derived soft-switching conditions for MABs and gave guidelines for the selection of a suitable operating point.…”

mentioning

confidence: 99%

An Isolated Gate Driver for Multi-Active Bridges with Soft Switching

Grimm¹,

Kolahian²,

Wood³

et al. 2022

Preprint

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The design of gate drivers is an important topic in power converter topologies that can help reduce switching losses and increase power density. Gate driving techniques that offer zero-voltage switching and/or zero current switching have recently been successfully proposed for different modular multilevel converters such as the cascaded H bridge. Previous papers on other multilevel converters such as the multi-active bridge, however, do not sufficiently assess the topics of gate driver design for this topology. This work presents a novel isolated gate driver architecture tailored to the multi-active bridge topology. Zero voltage switching is then achieved using two multi-winding transformers. The advantages of the proposed topology are not only a reduction of switching losses but also reduced component count. The topology is evaluated on a prototype using experimental results. It was shown using simulation and experiments that the proposed topology has a high efficiency while providing compact power packaging. Especially for converters with many levels, the proposed topology is therefore advantageous compared to existing solutions.

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Performance evaluation of an automatic resonant switched capacitor-based voltage balancing circuits for series connected batteries

Hafiz,

Wijaya,

Kurniawan

2024

Eng. Res. Express

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Electrical energy storage (EES) plays a crucial role in various power applications. Voltage imbalance is a common issue that can negatively affect the efficiency, reliability, and safety of EESs. Several types of voltage balancing (VB) circuits have been proposed in much of the literature. Among these VB circuits, switched capacitor (SC)-based circuits have attracted significant interest due to their efficiency, cost-effectiveness, compact size, and ease of control, but their balancing performance is not yet satisfactory. As a result, structural modifications in SC-based circuits have been widely proposed to improve balancing performance. However, not all of these circuit structures have been implemented into a resonant switched capacitor (RSC)-based voltage balancing, which has higher efficiency. Hence, this study aims to assess the efficiency of RSC-based VB circuits by conducting analog simulation using the Matlab Simulink software. This research evaluates the performance of the VB circuit not only in terms of its speed and efficiency, but also in terms of its energy distribution. The results show that the delta structure is the fastest in terms of balancing speed when completing the balancing process, followed by the mesh structure and the parallel structure. The best energy distribution is produced by a parallel structure, as indicated by the change in voltage of all battery cells always moving towards a convergent value, regardless of the variations in initial imbalance conditions. Meanwhile, other circuit structures distribute energy randomly, allowing the voltage of the battery cells to change not directly towards a convergent value. Lastly, the paper summarizes the balancing speed, efficiency, circuit complexity, and quality of energy distribution.

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A Multi-Active-Half-Bridge Converter based Soft-switched Fast Voltage Equalizer for Multi-cell to Multi-cell Charge Transfer

Cited by 6 publications

References 12 publications

A Direct Modularization Method for Multi-cell to Multi-cell Equalizer with Large Cell Count

A Direct Modularization Method for Multi-cell to Multi-cell Equalizer with Large Cell Count

An Isolated Gate Driver for Multi-Active Bridges with Soft Switching

Performance evaluation of an automatic resonant switched capacitor-based voltage balancing circuits for series connected batteries

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