High-Power Bidirectional DC–DC Converter for Aerospace Applications

Naayagi, R. T.; Forsyth, A.J.; Shuttleworth, R.

doi:10.1109/tpel.2012.2184771

Cited by 269 publications

(107 citation statements)

References 26 publications

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“…In contrast to the buck mode, the phase of the V ab square wave is shifted by the phase of the V cd square wave. Thus, bidirectional power flow is enabled through the transformer and inductor, and power flows through the bridge, thus generating the leading square wave [4], [9].…”

Section: Dual Active Bridge Dc/dc Convertermentioning

confidence: 99%

“…However, this topology requires additional snubber circuits to restrain the voltage stress of the switches, which increases circuit complexity and decreases power conversion efficiency [1], [2]. A bi-directional phase-shift full-bridge converter was suggested with high-frequency galvanic isolation for energy storage systems [3], [4]. This converter improves power conversion efficiency by using a soft-switching feature.…”

Section: Introductionmentioning

confidence: 99%

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Optimized Design of Bi-Directional Dual Active Bridge Converter for Low-Voltage Battery Charger

Jeong¹,

Ryu²,

Kim³

et al. 2014

Journal of Power Electronics

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This study proposes an optimized design of a dual active bridge converter for a low-voltage charger in a military uninterrupted power supply (UPS) system. The dual active bridge converter is among various bi-directional DC/DC converters that possess a high-efficiency isolated bi-directional converter. In the general design, the zero-voltage switching(ZVS) region is reduced when the battery voltage is high. By contrast, efficiency is low because of high conduction losses when the battery voltage is low. Variable switching frequency is applied to increase the ZVS region and the power conversion efficiency, depending on battery voltage changes. At the same duty, the same power is obtained regardless of the battery voltage using the variable switching frequency. The proposed method is applied to a 5 kW prototype dual active bridge converter, and the experimental results are analyzed and verified.

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Section: Dual Active Bridge Dc/dc Convertermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimized Design of Bi-Directional Dual Active Bridge Converter for Low-Voltage Battery Charger

Jeong¹,

Ryu²,

Kim³

et al. 2014

Journal of Power Electronics

View full text Add to dashboard Cite

show abstract

“…Applications such as plug-in hybrid electric vehicles [1], renewable energy storage [2], uninterruptible power supply (UPS) systems [3], aerospace applications [4] and smart grids [5] usually need an energy storage device, which increase the popularity of the bidirectional DC-DC converters. As the DAB converter has many advantages, such as galvanic isolation, zero-voltage switching, high power density, high efficiency, and symmetric structure [6], it has been drawn more attention compared with other bidirectional DC-DC converters.…”

Section: Introductionmentioning

confidence: 99%

Stability analysis of digitally controlled dual active bridge converters

Shi

Liu

et al. 2017

J. Mod. Power Syst. Clean Energy

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The dual active bridge (DAB) converters are widely used in the energy storage equipment and the distributed power systems. However, the existence of switching nonlinearity and control delay can cause serious stability problem to the DAB converters. Thus, this paper, studies the stability of a digitally controlled DAB converter with an output voltage closed loop controller. Firstly, to accurately study the stability in a DAB converter, a discrete-time model established in a whole switching period is obtained. The model considers the output capacitor ESR, the digital control delay, and sample-and-hold process. By using this model, the stabilities of the DAB converter versus the proportional controller parameter and the output capacitor ESR are analyzed and the critical values are predicted accurately. Moreover, the stability boundary of the proportional controller parameter and the output capacitor ESR is also obtained. The result shows that the value of the output capacitor ESR can have a great effect on the stability region of the proportional controller parameter. Finally, the theoretical analyses are verified by the simulation and experimental results.

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“…In addition, these voltages may fluctuate, which is characteristic of storage and renewable energy sources [4,5]. An important application field of these converters is also automotive and aeronautical engineering, where there are multi-voltage DC systems [6,7].…”

Section: Introductionmentioning

confidence: 99%

Analytical description of power losses in a transformer operating in the dual active bridge converter

Barlik

Nowak

Grzejszczak

et al. 2016

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. The paper presents an analytical approach to the determination of power losses in a high-frequency transformer operating in the dual active bridge (DAB). This transformer, having two single-phase transistor bridge inverters, couples two DC circuits that significantly differ in voltages (280 V and 51 V ±20%). Power losses in the core and windings of the planar transformer 5600 VA /100 kHz were calculated taking into account changes in the value and direction of the energy flow between the coupled DC circuits. These circuits represent storage or renewable energy sources and intermediate circuits of the converters used in distributed generation systems. Calculations were performed using the Steinmetz's and Dowell's equations. The analytical results have been verified experimentally.Key words: core and windings losses, ferrite, planar transformer, Steinmetz's equation, Dowell's model, dual active bridge. determining the power losses in the core and windings of high frequency transformers. However, the results reported in these publications are obtained in an experimental way and confirmed using a complex analytical description, which is difficult to use in practice. In a number of publications (e.g. [11,[13][14][15]17]), attention is paid to the impact of the growth of the winding resistance for the harmonic current of the transformer, but with no reference to the operation in the DAB system. This paper presents the analytical determination of the power losses in the core and windings of the high-frequency transformer which operates in a dual active bridge. For the determination of these losses, the Steinmetz and Dowell models were used [18,19]. The results of the power losses calculations include the influence of the transformer temperature different relationships between the DC voltages and varying shift modulation ratios of the DAB converter. Analytical description of power losses in a transformerSection 2 presents an overview of a DAB system that includes the transformer being the main subject of this study. Section 3 provides a description of the construction of the transformer and its basic parameters. Sections 4 and 5 are devoted to the discussion of the analytical models used to determine the power loss, as well as the presentation of the results of calculations of the losses in the core and windings of the transformer under consideration. Section 6 provides the results of calculations of the total power loss and transformer energy efficiency with respect to the DAB system. In Section 7, the results obtained analytically and the results of experimental measurements are compared. Section 8 is a summary of the study, containing a brief assessment of the results and conclusions regarding the suitability of the proposed analytical description. The dual active bridge (DAB)Among different versions of dual active bridges, the most commonly presented in the literature are single-phase systems. They

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High-Power Bidirectional DC–DC Converter for Aerospace Applications

Cited by 269 publications

References 26 publications

Optimized Design of Bi-Directional Dual Active Bridge Converter for Low-Voltage Battery Charger

Optimized Design of Bi-Directional Dual Active Bridge Converter for Low-Voltage Battery Charger

Stability analysis of digitally controlled dual active bridge converters

Analytical description of power losses in a transformer operating in the dual active bridge converter

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