A high-power-density DC/DC converter for high-power distributed power systems

Canales, Francisco; Barbosa, Peter; Aguilar, C.; Lee, F.C.

doi:10.1109/pesc.2003.1218267

Cited by 53 publications

(7 citation statements)

References 12 publications

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“…Soft-switching techniques are usually used in these power converters in order to reduce switching losses and to improve global efficiency. These improvements have already been described in the literature for SAB [6], SRC [7] or DAB [8] topologies.…”

Section: Introductionmentioning

confidence: 70%

Comparison of multi-phase SAB converters vs. multi-phase SRC converters

Garcia-Bediaga¹,

Villar²,

Etxeberria-Otadui³

et al. 2013

2013 IEEE Energy Conversion Congress and Exposition

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This paper presents a novel comparative study of two multi-phase medium-frequency (MF) dc-dc converters: a single-active-bridge (SAB) and series-resonant-converter (SRC). Moreover, a new parametric model of SAB converters is developed, where the number of phases is a parameter within the expressions. The analytical comparison is verified with simulation and experimental results, using PLECS software and a 10 kW / 20 kHz / 500 V laboratory prototype.

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Section: Introductionmentioning

confidence: 70%

Comparison of multi-phase SAB converters vs. multi-phase SRC converters

Garcia-Bediaga¹,

Villar²,

Etxeberria-Otadui³

et al. 2013

2013 IEEE Energy Conversion Congress and Exposition

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“…The hybrid FB three-level (H-FB TL) LLC converter [9] (Fig. 3) is used as the UDC because it integrates the following advantages of the H-FB TL converter [10] and the LLC resonant converter [11]- [13]: 1) ZVS capability from nearly zero to full load; 2) the rectifier diodes sustain only the output voltage, and they can realize ZCS; 3) high efficiency can be achieved over a wide input voltage range; and 4) it can operate in three-level (3L) and two-level (2L) modes, so the output filter and input current ripple can be reduced. This is a very important attribute for a fuel cell power system.…”

Section: B Unidirectional Convertermentioning

confidence: 99%

A Hybrid Fuel Cell Power System

Jin

Ruan

Yang

et al. 2009

IEEE Trans. Ind. Electron.

268

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This paper proposes a hybrid fuel cell power system, which consists of a fuel cell, an isolated unidirectional converter, a bidirectional converter, an inverter, and a battery. The fuel cell and the battery are connected to the same voltage bus through an appropriate hybrid full-bridge LLC resonant unidirectional converter and a three-level buck/boost bidirectional converter, respectively. The battery is an auxiliary energy source, powers the load during the system's start state to make it easy for the system to cold start, and provides or absorbs the dynamic power when the load varies and the fuel cell cannot respond immediately, so the system dynamic characteristics are improved. Furthermore, the battery can also provide peak power at overload, so the power rating of the fuel cell can be decreased, which reduces the total system cost. In order to ensure that the system operates with high efficiency, this paper also proposes a power management control scheme, which controls the bidirectional converter operating under buck, boost, or shutdown mode according to the operation condition of the fuel cell and battery, so that the battery can be charged or discharged. The operation of the system during cold start and overload are analyzed in detail. A 1-kW fuel cell power system was built in the laboratory. Experimental results are shown to verify the theoretical analysis.

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Section: Introductionmentioning

confidence: 99%

“…These topologies are currently being tested for industrial applications [1] [2]. Soft-switching techniques are usually required in these power converters in order to reduce switching losses and to improve the global efficiency; as has already been described in the literature for dual-active-bridge (DAB) [3], single-active-bridge (SAB) [4] and series-resonant-converter (SRC) topologies [5].The high number of possible topologies makes the optimal design of MF converters complex. Moreover, the operating range and the specifications of the application usually emphasize only the advantages or drawbacks of some power circuits.…”

mentioning

confidence: 99%

New optimal design methodology of medium-frequency soft-switching converters

Garcia-Bediaga¹,

Villar²,

Rujas³

et al. 2013

2013 IEEE Energy Conversion Congress and Exposition

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This paper presents a new simple design methodology aimed at reaching the best medium-frequency (MF) converter for a given application. For a proper methodology the characterization of the semiconductors is essential. Thus this work analyzes the behavior of different semiconductors under hard and soft-switching conditions, providing some design practices for their selection. Soft-switching components have been designed for different topologies using an optimization process. The proposed methodology has been validated with a small-scale prototype (10 kW / 500 V), and experimental results are presented.Index Terms-medium frequency, semiconductor characterization, soft-switching, high-power density. I. INTRODUCTIONThe volume of power converters is an important restriction in several medium-voltage (MV) applications, such as transport or offshore wind-farms. MF transformers offer an efficient light-weight solution, where an isolation or an electrical energy transformation is needed. Nevertheless, the reduced space makes difficult the dissipation of losses in high-power converters, requiring optimal designs and the implementation of soft-switching techniques in the power converters.Medium-frequency dc-dc topologies can be classified in two categories: non-resonant and resonant converters. Several efficient isolated circuits have been proposed in the literature for high power MV applications. These topologies are currently being tested for industrial applications [1] [2]. Soft-switching techniques are usually required in these power converters in order to reduce switching losses and to improve the global efficiency; as has already been described in the literature for dual-active-bridge (DAB) [3], single-active-bridge (SAB) [4] and series-resonant-converter (SRC) topologies [5].The high number of possible topologies makes the optimal design of MF converters complex. Moreover, the operating range and the specifications of the application usually emphasize only the advantages or drawbacks of some power circuits. The interest of optimal design methodologies [6] for mediumfrequency conversion systems is increasing. The objective of this paper is to propose a new optimal design methodology for various dc-dc power topologies: SAB, DAB and SRC.

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A high-power-density DC/DC converter for high-power distributed power systems

Cited by 53 publications

References 12 publications

Comparison of multi-phase SAB converters vs. multi-phase SRC converters

Comparison of multi-phase SAB converters vs. multi-phase SRC converters

A Hybrid Fuel Cell Power System

New optimal design methodology of medium-frequency soft-switching converters

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