Review of high efficiency bidirectional dc-dc topologies with high voltage gain

IEEE Trans. on Ind. Applicat.

Jørgensen

et al. 2019

Self Cite

High efficiency and low cost power converters for interfacing energy storage have become critical in renewable energy systems. In this paper a fractional charging converter (FCC) is proposed to reduce power rating as well as cost of the dcdc converter for hydrogen production by alkaline electrolyzer cells. The FCC configuration only processes the partial power resulting from the voltage difference between the source and the energy storage element. Moreover, the converter employed in such configuration can be either isolated or non-isolated, which simplifies topology selection. An analysis and comparison of two dcdc topologies using a high-frequency transformer based on component stress factor (CSF) is performed to determine the optimal solution for the evaluated application. Based on the results of the CSF analysis, and due to its capability of handling wide input voltage, the isolated full-bridge boost (IFBB) converter is designed, built and tested. Experimental results prove the feasibility of the fractional charging configuration with a reduction of 80% of the power rating compared to the traditional interconnection, which implies a reduction in cost, weight and an increase in efficiency. The converter's maximum voltage gain achieved is 25 and the highest measured system efficiency is 98.2 %.

Section: Comparing Dab and Ifbb Converter By Component Stress Famentioning

confidence: 99%

Fractional Charging Converter With High Efficiency and Low Cost for Electrochemical Energy Storage Devices

Mira

IEEE Trans. on Ind. Applicat.

Jørgensen

et al. 2019

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“…An analysis and review of high efficiency bidirectional dc/dc converters with high voltage gain is performed [8]. Based on the analysis and the system specifications, the topology selection is narrowed down to two candidate topologies: dual active bridge (DAB) and isolated full bridge boost (IFBB) converter.…”

Section: Ecmentioning

confidence: 99%

Analysis and Comparison of dc/dc Topologies in Partial Power Processing Configuration for Energy Storage Systems

Mira

2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia)

Andersen

2018

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“…Several converters with comparable specifications to the one in this paper is found in existing literature. [1] lists a few relevant converter prototypes: [2] [3] [4] [5] [6], while some other are discussed in: [7] and [8]. These converters all have peak efficiencies in the range from 96% to slightly below 98%.…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient EV Battery Charger Using Fractional Charging Concept with SiC Devices

Kanstad

Lillholm

2019 IEEE Applied Power Electronics Conference and Exposition (APEC)

2019

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This paper describes the implementation of the fractional power conversion concept for use in an on-board charger for Electric Vehicles (EV). High gain step up topologies are required and an efficiency analysis of the full bridge boost converter is made. A comparison of many power devices including Si, GAN and SiC devices concludes that SiC devices are well suited for this application. Using loss equations and battery charging characteristics the converter is optimized for low loss in a full battery charge cycle. Switching-average methods model the small signal characteristics and a PI controller is implemented. The fractional charging configuration results in a very high current gain. A 100 kHz prototype was tested on a 300 V EV battery, achieving a converter efficiency of 97.6%. For a 400 V battery the charger can charge 4 kW at more than 98% efficiency. The power density of the charger is 3.6 kW/L.