EPE Association: EPE 2025 - LS2b: Electromobility

EPE 2025 - LS2b: Electromobility
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2025 - Conference > EPE 2025 - Topic 01: Electromobility - The Powerful Factor in Reducing CO2 > EPE 2025 - LS2b: Electromobility

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   Comparative Stability Study of a Dual Active Bridge-Based Battery Charger with Advanced Modulation Schemes
By Martin SCOHIER, Olivier DEBLECKER, Bashir BAKHSHIDEH ZAD [View]
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Abstract: Thanks to their galvanic isolation and bidirectional power transfer features, the Dual Active Bridge (DAB) converters can offer a promising solution for interconnecting battery chargers to emerging DC grid applications. When cascaded with LC filters, the charger stability can be affected by the impedance interactions caused by the closed-loop charging process. This is exacerbated by the wide range of operating points in terms of DC voltages as well as the numerous Modulation Schemes (MS). To address this, the current paper extends the averaged small-signal model to the case of a Constant Current Constant Voltage (CC-CV) charging process. A stability analysis method is proposed to compare Single, Extended, Dual and Triple Phase Shift MS during a charging cycle. Simulation results validate the proposed models and highlight the flaws of advanced MS under varying operating conditions.

   Design Considerations and Validation of a GaN e-HEMT-Based Cryogenic Power Converter
By Jisun HAM, Junyeol MAENG, Chaemin IM, Dongsu SEO, Jaheum KOO, Seungyong HAHN, Shenghui CUI [View]
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Abstract: As efforts to reduce CO2 emissions grow, cryogenic power electronic converters are gaining attention for applications in electric propulsion, aerospace, and superconducting technologies. This paper presents the design and experimental validation of a power converter using GaN enhancement-mode high electron mobility transistors (e-HEMTs) optimized for cryogenic environments. Losses and efficiency are compared at room temperature (RT) and cryogenic temperature (CT), highlighting the influence of temperature on device characteristics and converter performance. Results show significant loss reductions at CT, with air cooling for RT testing and liquid nitrogen for CT experiments. These findings demonstrate the viability of GaN e-HEMT-based converters in cryogenic applications.

   Vehicle-Driven Operation of an Adaptive IPT System with Tolerance to Large Magnetic Coupling Coefficient Variations
By Francisco Javier LÓPEZ-ALCOLEA, Emilio José MOLINA-MARTÍNEZ, Alfonso PARREÑO-TORRES, Jaime GARCÍA-JIMÉNEZ, Javier VAZQUEZ, Pedro RONCERO-SÁNCHEZ [View]
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Abstract: This paper proposes an adaptive operation of a bidirectional inductive power transfer (IPT) system designed for the wireless charging of electric vehicles (EVs). It is composed of two controllers and an expert control layer that monitors the operation, giving the system this adaptability feature. Experimental results demonstrate its correct operation.

EPE 2025 - LS2b: Electromobility
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2025 - Conference > EPE 2025 - Topic 01: Electromobility - The Powerful Factor in Reducing CO2 > EPE 2025 - LS2b: Electromobility
	[return to parent folder]

	Comparative Stability Study of a Dual Active Bridge-Based Battery Charger with Advanced Modulation Schemes By Martin SCOHIER, Olivier DEBLECKER, Bashir BAKHSHIDEH ZAD	[View] [Download]
Abstract: Thanks to their galvanic isolation and bidirectional power transfer features, the Dual Active Bridge (DAB) converters can offer a promising solution for interconnecting battery chargers to emerging DC grid applications. When cascaded with LC filters, the charger stability can be affected by the impedance interactions caused by the closed-loop charging process. This is exacerbated by the wide range of operating points in terms of DC voltages as well as the numerous Modulation Schemes (MS). To address this, the current paper extends the averaged small-signal model to the case of a Constant Current Constant Voltage (CC-CV) charging process. A stability analysis method is proposed to compare Single, Extended, Dual and Triple Phase Shift MS during a charging cycle. Simulation results validate the proposed models and highlight the flaws of advanced MS under varying operating conditions.

	Design Considerations and Validation of a GaN e-HEMT-Based Cryogenic Power Converter By Jisun HAM, Junyeol MAENG, Chaemin IM, Dongsu SEO, Jaheum KOO, Seungyong HAHN, Shenghui CUI	[View] [Download]
Abstract: As efforts to reduce CO2 emissions grow, cryogenic power electronic converters are gaining attention for applications in electric propulsion, aerospace, and superconducting technologies. This paper presents the design and experimental validation of a power converter using GaN enhancement-mode high electron mobility transistors (e-HEMTs) optimized for cryogenic environments. Losses and efficiency are compared at room temperature (RT) and cryogenic temperature (CT), highlighting the influence of temperature on device characteristics and converter performance. Results show significant loss reductions at CT, with air cooling for RT testing and liquid nitrogen for CT experiments. These findings demonstrate the viability of GaN e-HEMT-based converters in cryogenic applications.

	Vehicle-Driven Operation of an Adaptive IPT System with Tolerance to Large Magnetic Coupling Coefficient Variations By Francisco Javier LÓPEZ-ALCOLEA, Emilio José MOLINA-MARTÍNEZ, Alfonso PARREÑO-TORRES, Jaime GARCÍA-JIMÉNEZ, Javier VAZQUEZ, Pedro RONCERO-SÁNCHEZ	[View] [Download]
Abstract: This paper proposes an adaptive operation of a bidirectional inductive power transfer (IPT) system designed for the wireless charging of electric vehicles (EVs). It is composed of two controllers and an expert control layer that monitors the operation, giving the system this adaptability feature. Experimental results demonstrate its correct operation.