Comparison of soft-switching voltage-fed and current-fed bi-directional isolated Dc/Dc converters for fuel cell vehicles

Rathore, Akshay Kumar; Prasanna, Udupi R.

doi:10.1109/isie.2012.6237093

Cited by 70 publications

(20 citation statements)

References 18 publications

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“…However, recently current-fed converters have been justified and demonstrated to be meritorious over voltage-fed converters for low voltage high current applications [7][8] owing to lower input current ripple, lower HF transformer turns ratio, negligible diode ringing, no duty cycle loss, and easier current control ability. Usually current-fed converters employ RCD snubber [9][10], active-clamping [11][12][13] or other passive snubber to absorb device turn-off voltage spike.…”

mentioning

confidence: 99%

Naturally Clamped Soft-Switching Current-Fed Three-Phase Bidirectional DC/DC Converter

Pan

Rathore

2015

IEEE Trans. Ind. Electron.

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Abstract-A novel bidirectional snubberless naturally clamped soft-switching three-phase current-fed dc/dc converter is proposed. Proposed secondary modulation technique naturally clamps the voltage across the primary side devices with zero current commutation (ZCC) eliminating the necessity for active-clamp circuit or passive snubbers and solving the traditional problem of device turn-off voltage spike. Switching losses are reduced significantly owing to zero-current switching (ZCS) of primary side devices and zero-voltage switching (ZVS) of secondary side devices. Soft-switching and natural voltage-clamping (NVC) are inherent and load independent. The proposed bidirectional converter achieves high efficiency, high density, high reliability, small volume, light weight and low cost compared to active-clamped ZVS counterpart. Steady state operation, analysis, and design of the proposed topology are explained. Experimental results are demonstrated to verify the natural clamping, soft-switching, operation, and analysis.

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confidence: 99%

Naturally Clamped Soft-Switching Current-Fed Three-Phase Bidirectional DC/DC Converter

Pan

Rathore

2015

IEEE Trans. Ind. Electron.

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“…Soft switching CSC topologies have been proven to outperform their voltage-source counterparts due to a wider soft switching range over the power and the input voltage variations, lower rms current of semiconductors, low input current ripple, lower turns ratio of the transformer, resulting in smaller parasitic elements, higher part-load efficiency, simpler requirements to the isolation transformer design, etc. [18][19][20][21] At the same time, a number of CSC topologies exist that feature clamping and soft switching without auxiliary circuits. In general, these can be attributed to resonant [22][23][24][25][26][27] and secondary-modulated ones (also referred to as snubberless).…”

Section: Discussionmentioning

confidence: 99%

Snubberless boost full‐bridge converters: Analysis of soft switching performance and limitations

Blinov

Kosenko

Chub

et al. 2019

Circuit Theory & Apps

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Summary This paper analyses current‐fed (current source) isolated dc‐dc converters that are proposed for various renewable energy and dc microgrid applications, such as photovoltaic, fuel cell, or energy storage systems. The analysis addresses current‐fed (boost) full‐bridge converters that achieve clamping and soft switching without dedicated external auxiliary circuits, such as snubbers or clamps. Such converters have certain limitations that can lead to degraded performance and feasibility due to high circulating energy or low silicone utilization at some operating points. The current study reveals these limitations, highlighting advantages and drawbacks of selected snubberless converters at different operating conditions. The relation between the rms input current and the isolation transformer primary current as well as the cumulative rms current of primary semiconductors is used as figure of merit for converter characterization. This approach can be extended and applied to other topology types and used as a universal tool for performance assessment of snubberless converters without auxiliary circuits for particular operating conditions in various systems.

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“…Studies have already been done to prove the validity of the current-fed DAB for photovoltaic applications [6], [8], [9]. As demonstrated in [10], current-fed DAB converters can achieve 93.4% efficiency over 91.5% efficiency of the voltage-fed DAB by adding minimal conduction losses in exchange for reducing switching losses.…”

Section: List Ofmentioning

confidence: 98%

Analytical Treatment of the Power Transfer Relationships for a Coupled, Current-Fed, Multi-Port Dual Active Bridge Converter

Smith

Grainger

2019

2019 IEEE Electric Ship Technologies Symposium (ESTS)

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Existing research has demonstrated that mutual inductors within the load ports of a Dual Active Bridge (DAB)-based converter enable fault tolerant operation. Similar research efforts with the DAB converter have also proven that incorporating a multi-winding transformer in the design can result in an interconnection of multiple DC buses with isolation and reduced switching losses. Therefore, a current-fed, multi-port DAB converter is proposed with the intention of capturing the benefits of both features. The performance of the proposed converter is evaluated against the traditional multi-port DAB. In particular, the potentially non-ideal square waveforms at load port voltages are mathematically described. The converter characteristic equations are then verified with PLECS simulations. Finally, the effects of inductor size on port voltages and power transfer are explored. The results of the analyses provide the conditions in which simplification to power flow equations for voltage-fed multi-port converters is applicable. v Table of Contents

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Comparison of soft-switching voltage-fed and current-fed bi-directional isolated Dc/Dc converters for fuel cell vehicles

Cited by 70 publications

References 18 publications

Naturally Clamped Soft-Switching Current-Fed Three-Phase Bidirectional DC/DC Converter

Naturally Clamped Soft-Switching Current-Fed Three-Phase Bidirectional DC/DC Converter

Snubberless boost full‐bridge converters: Analysis of soft switching performance and limitations

Analytical Treatment of the Power Transfer Relationships for a Coupled, Current-Fed, Multi-Port Dual Active Bridge Converter

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