5 research outputs found

    Investigation of a bidirectional DC/DC converter with zero-voltage switching operation for battery interfaces

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    This paper proposes a bidirectional DC-DC converter with soft-switching capabilities. The main characteristic of this converter is that it can be operated in both boost and buck modes. The major advantages of this converter are high efficiency and reduced switching loss in high-power and high-voltage applications. The soft-switching capability is obtained by additional dual auxiliary resonant circuits connected to the conventional non-isolated bidirectional DC-DC converter. Except for the auxiliary switches, all main switches turn on with zero-voltage switching in this proposed bidirectional DC-DC converter. The auxiliary switches turn off with zero current transition. The principle of operation, theoretical analysis and experimental results of a 175 V/385 V bidirectional DC-DC converter at 2 KW output power with switching frequency of 50 kHz are provided. The experimental results verified the zero-voltage switching operation for boost and buck modes with efficiencies 96.5% and 96%, respectively, at full load.This research has been supported by the Ministry of Education, Youth and Sports of the Czech Republic under the project OP VVV Electrical Engineering Technologies with High-Level of Embedded Intelligence CZ.02.1.01/0.0/0.0/18_069/0009855 and project No. SGS-2018-009.Scopu

    Novel soft-switching interleaved boost converters for renewable energy conversion systems

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    This paper proposes new soft-switching interleaved boost converters (SSIBC) for photovoltaic power generation systems. The SSIBCs presented comprises with additional dual and single auxiliary cells. The main active switches of these converters are able to provide zero voltage switching (ZVS) and zero current switching (ZCS) operation by means of dual auxiliary and single auxiliary cells, respectively. The proposed converters are capable to reduce turn on and turn off switching power losses with their soft-switching operation and consequently, they mitigate the overall efficiency. In addition, the auxiliary switches also achieve soft-turn on and turn off operation, during the total softswitching region of main switches. The detailed principle of operation and simulation evaluations presented in this paper validate the effectiveness and soft-switching ability of the proposed interleaved boost converters

    A Novel Soft-Switching Bidirectional DC-DC Converter for Energy Storage Applications

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    In this paper, a soft-switching bidirectional DC-DC converter is proposed. In order to achieve soft-switching conditions ZVS turn on / ZCS turn off, the auxiliary circuit including a switch, a capacitor, a diode and a small inductor are adapted to the bidirectional converter. The soft-switching characteristics in this converter are achieved regardless of power transfer. Due to the existence of auxiliary circuit, the switching losses are reduced and thus improve the overall efficiency. The switching devices achieved ZVS turn on and ZCS turn off operations, while converter operated in boost and buck modes, respectively. The operating principles are described and verify the soft-switching characteristics by its simulation analysis. The proposed converter system 100V/340V/650W is validated by simulation analysis

    A novel soft-switching bidirectional DC-CD converter for energy storage applications

    No full text
    In this paper, a soft-switching bidirectional DC-DC converter is proposed. In order to achieve softswitching conditions ZVS turn on / ZCS turn off, the auxiliary circuit including a switch, a capacitor, a diode and a small inductor are adapted to the bidirectional converter. The soft-switching characteristics in this converter are achieved regardless of power transfer. Due to the existence of auxiliary circuit, the switching losses are reduced and thus improve the overall efficiency. The switching devices achieved ZVS turn on and ZCS turn off operations, while converter operated in boost and buck modes, respectively. The operating principles are described and verify the soft-switching characteristics by its simulation analysis. The proposed converter system 100V/340V/650W is validated by simulation analysis
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