EPE Association: EPE 2025 - LS6a: DC/DC Converter Topologies

EPE 2025 - LS6a: DC/DC Converter Topologies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2025 - Conference > EPE 2025 - Topic 09: Power Converter Topologies > EPE 2025 - LS6a: DC/DC Converter Topologies

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   Adaptative Resonant Tank of Bidirectional CLLC Resonant Converters for Electric Vehicle Charging Applications
By Borja PRIETO, Ander ÁVILA, David GARRIDO, Iosu AIZPURU, Alejandro RUJAS [View]
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Abstract: This paper focuses on optimizing the design of CLLC converters for asymmetric bidirectional operation, a critical requirement in electric vehicle (EV) charging systems. Previous research has shown that CLLC converters are effective due to their soft-switching characteristic, achieving high performance in terms of efficiency and power density. However, challenges remain in optimizing their operation for bidirectional power flow, particularly for wide voltage and load applications such as vehicle-to-grid (V2G). To address this, we evaluate a novel approach that adds a parallel inductor to the primary side of the resonant tank in reverse operation to improve the gain characteristics and efficiency. The research uses theoretical analysis and simulations. The results show a resonant converter capable of meeting the requirements of a wide voltage and load range application without compromising the performance of the main operating mode, all while keeping the magnetizing/leakage inductance relation within the design criteria for integrated transformers.

   DC-DC converter with low components voltage stress and reduced conduction losses by branches parallel connection
By Robert STALA, Filip ORLOWSKI [View]
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Abstract: This paper presents modular DC-DC bi-directional converter, which is characterized by reduced voltage and current stress of components as well as increased frequency of current ripple. The converter is dedicated to work with a high voltage step-down ratio, because the output current is divided among many switches, reducing their resistive losses. In addition, the synchronous branches of the system conduct the in parallel connection. The converter can be implemented from discrete components or half-bridge modules, which can simplify its design. Concept of the converter, its modular design, basic waveforms and efficiency results are demonstrated. Basic experimental results are presented as well. The advantages resulting from the multi-division input voltage and the parallel operation of transistors branches are discussed.

   Trapezoidal Wave Operation of High-power Non-isolated DC/DC Converter for Current Stress Reduction
By Ning WANG, Binbin LI, Yingzong JIAO, Dianguo XU [View]
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Abstract: All-DC offshore wind farms are crucial for advancing large-scale offshore wind power in deep-sea applications. Overcoming the technical bottleneck of high-power DC/DC converters is essential for these farms. This paper presents a trapezoidal wave operation method for non-isolated DC/DC converters, introducing design constraints for minimum current stress and minimum root-mean-square (RMS) of current. These innovations significantly reduce converter current stress, enhancing the power capacity of DC/DC converter. The operation principle of two-phase and three-phase structures are introduced, and the effectiveness has been confirmed by simulation and experiment results.

EPE 2025 - LS6a: DC/DC Converter Topologies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2025 - Conference > EPE 2025 - Topic 09: Power Converter Topologies > EPE 2025 - LS6a: DC/DC Converter Topologies
	[return to parent folder]

	Adaptative Resonant Tank of Bidirectional CLLC Resonant Converters for Electric Vehicle Charging Applications By Borja PRIETO, Ander ÁVILA, David GARRIDO, Iosu AIZPURU, Alejandro RUJAS	[View] [Download]
Abstract: This paper focuses on optimizing the design of CLLC converters for asymmetric bidirectional operation, a critical requirement in electric vehicle (EV) charging systems. Previous research has shown that CLLC converters are effective due to their soft-switching characteristic, achieving high performance in terms of efficiency and power density. However, challenges remain in optimizing their operation for bidirectional power flow, particularly for wide voltage and load applications such as vehicle-to-grid (V2G). To address this, we evaluate a novel approach that adds a parallel inductor to the primary side of the resonant tank in reverse operation to improve the gain characteristics and efficiency. The research uses theoretical analysis and simulations. The results show a resonant converter capable of meeting the requirements of a wide voltage and load range application without compromising the performance of the main operating mode, all while keeping the magnetizing/leakage inductance relation within the design criteria for integrated transformers.

	DC-DC converter with low components voltage stress and reduced conduction losses by branches parallel connection By Robert STALA, Filip ORLOWSKI	[View] [Download]
Abstract: This paper presents modular DC-DC bi-directional converter, which is characterized by reduced voltage and current stress of components as well as increased frequency of current ripple. The converter is dedicated to work with a high voltage step-down ratio, because the output current is divided among many switches, reducing their resistive losses. In addition, the synchronous branches of the system conduct the in parallel connection. The converter can be implemented from discrete components or half-bridge modules, which can simplify its design. Concept of the converter, its modular design, basic waveforms and efficiency results are demonstrated. Basic experimental results are presented as well. The advantages resulting from the multi-division input voltage and the parallel operation of transistors branches are discussed.

	Trapezoidal Wave Operation of High-power Non-isolated DC/DC Converter for Current Stress Reduction By Ning WANG, Binbin LI, Yingzong JIAO, Dianguo XU	[View] [Download]
Abstract: All-DC offshore wind farms are crucial for advancing large-scale offshore wind power in deep-sea applications. Overcoming the technical bottleneck of high-power DC/DC converters is essential for these farms. This paper presents a trapezoidal wave operation method for non-isolated DC/DC converters, introducing design constraints for minimum current stress and minimum root-mean-square (RMS) of current. These innovations significantly reduce converter current stress, enhancing the power capacity of DC/DC converter. The operation principle of two-phase and three-phase structures are introduced, and the effectiveness has been confirmed by simulation and experiment results.