EPE Association: EPE 2025 - LS4a: DC/DC Converter Topologies

EPE 2025 - LS4a: 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 - LS4a: DC/DC Converter Topologies

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   Analysis of Imbalance in Input-Series Output-Parallel Configuration of Series Resonant Converters
By Minho KWON, Yojung JEON, Jong-Pil LEE [View]
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Abstract: This paper analyses the power imbalance in input series output parallel (ISOP) configurations of series resonant converters (SRC), which are crucial for MVDC to LVDC conversion where electrical isolation and bidirectional operation are required. The dual active bridge (DAB)-based ISOP structure presents a promising solution, but it requires careful management of power distribution among modules to prevent imbalances. This study provides analysis on imbalance among SRC modules for a partial power control method, which contributes to reducing communication costs and complexity by minimizing the number of active control modules. Experimental results with two prototype SRC modules validate the theoretical analysis, demonstrating that power imbalances are negligible in the ISOP configuration.

   Bidirectional Single Input Multiple OutputPower Converters: Model and PerformanceAnalysis
By Diego BERNAL COBALEDA, Hans WOUTERS, Fanghao TIAN, Yu ZUO, Wilmar MARTINEZ [View]
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Abstract: \_This paper introduces a small-signal transformation model based on the cantilever approximation for transformers commonly used in LLC converters. The proposed transformation is evaluated towards extending resonant converters in multiport applications. The transformation is compared in a traditional LLC multi-active bridge against a cascade multilevel inverter configuration on the secondary side. The objective is to analyze the differences and similarities in their implementation and assess their impact on system efficiency based on topology, with a focus on comprehensively describing losses in resonant multioutput converters. Two low-power prototypes were developed to validate the proposed model and approximation. The case study examines the efficiency and cross-regulation trade-offs between the configurations. Simulation and experimental results verify the accuracy of the analytical approach, offering valuable insights for designing and implementing high-frequency transformers in multiport applications.

   Reconfigurable Interleaved LLC Resonant Converter Using Hybrid Modulation for Ultrawide Output Voltage Range
By Tae-Seok KANG, Hyun-Gyu KOH, Yoo-Seop KIM, Yeong-Jun CHOI [View]
[Download]

Abstract: Applications such as renewable energy, electric vehicle (EV) battery charger, EV electronic Components, energy storage system, and electrolyzer demand DC/DC converters with a wide voltage range. The LLC resonant converter is widely applied due to their high efficiency advantage. This paper proposes a reconfigurable interleaved LLC resonant converter with hybrid modulation for ultra-wide output voltage range applications. The proposed converter achieves three operating modes with extended voltage gain within a narrow frequency range by regulating the switching frequency and phase-shift angle. This allows the selection of a large magnetizing inductance and reduces circulating current and conduction losses. Additionally, the converter achieves zero voltage switching of the MOSFETs at full load. To verify the performance of the proposed converter, a 3.3kW rated converter with 400V input and 150V-800V output is designed.

EPE 2025 - LS4a: 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 - LS4a: DC/DC Converter Topologies
	[return to parent folder]

	Analysis of Imbalance in Input-Series Output-Parallel Configuration of Series Resonant Converters By Minho KWON, Yojung JEON, Jong-Pil LEE	[View] [Download]
Abstract: This paper analyses the power imbalance in input series output parallel (ISOP) configurations of series resonant converters (SRC), which are crucial for MVDC to LVDC conversion where electrical isolation and bidirectional operation are required. The dual active bridge (DAB)-based ISOP structure presents a promising solution, but it requires careful management of power distribution among modules to prevent imbalances. This study provides analysis on imbalance among SRC modules for a partial power control method, which contributes to reducing communication costs and complexity by minimizing the number of active control modules. Experimental results with two prototype SRC modules validate the theoretical analysis, demonstrating that power imbalances are negligible in the ISOP configuration.

	Bidirectional Single Input Multiple OutputPower Converters: Model and PerformanceAnalysis By Diego BERNAL COBALEDA, Hans WOUTERS, Fanghao TIAN, Yu ZUO, Wilmar MARTINEZ	[View] [Download]
Abstract: \_This paper introduces a small-signal transformation model based on the cantilever approximation for transformers commonly used in LLC converters. The proposed transformation is evaluated towards extending resonant converters in multiport applications. The transformation is compared in a traditional LLC multi-active bridge against a cascade multilevel inverter configuration on the secondary side. The objective is to analyze the differences and similarities in their implementation and assess their impact on system efficiency based on topology, with a focus on comprehensively describing losses in resonant multioutput converters. Two low-power prototypes were developed to validate the proposed model and approximation. The case study examines the efficiency and cross-regulation trade-offs between the configurations. Simulation and experimental results verify the accuracy of the analytical approach, offering valuable insights for designing and implementing high-frequency transformers in multiport applications.

	Reconfigurable Interleaved LLC Resonant Converter Using Hybrid Modulation for Ultrawide Output Voltage Range By Tae-Seok KANG, Hyun-Gyu KOH, Yoo-Seop KIM, Yeong-Jun CHOI	[View] [Download]
Abstract: Applications such as renewable energy, electric vehicle (EV) battery charger, EV electronic Components, energy storage system, and electrolyzer demand DC/DC converters with a wide voltage range. The LLC resonant converter is widely applied due to their high efficiency advantage. This paper proposes a reconfigurable interleaved LLC resonant converter with hybrid modulation for ultra-wide output voltage range applications. The proposed converter achieves three operating modes with extended voltage gain within a narrow frequency range by regulating the switching frequency and phase-shift angle. This allows the selection of a large magnetizing inductance and reduces circulating current and conduction losses. Additionally, the converter achieves zero voltage switching of the MOSFETs at full load. To verify the performance of the proposed converter, a 3.3kW rated converter with 400V input and 150V-800V output is designed.