EPE Association: EPE 2022 - DS2p: Vehicle Battery Chargers: Contact and Contactless

EPE 2022 - DS2p: Vehicle Battery Chargers: Contact and Contactless
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2022 ECCE Europe - Conference > EPE 2022 - Topic 08: Electric Vehicle Propulsion Systems and their Energy Storage > EPE 2022 - DS2p: Vehicle Battery Chargers: Contact and Contactless

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   A Novel Dual CC-CV Output Wireless EV Charger With Minimal Dependency on Both Coil Coupling and Load Variation
By Subhranil BARMAN [View]
[Download]

Abstract: Robust and efficient wireless EV charging requires load and coupling independent CC and CV modes. Existing literature focus either on CC or CV mode. The characteristics of the schemes which cater to both the modes are affected by load and coupling coefficient. In this paper, an improved dual output charger topology is proposed that is maximally independent from variations in coil coupling and load. Relevant analysis and simulation results are shown to validate the working of the proposed topology.

   A Reconfigurable Single-Stage Three-Phase Electric Vehicle DC Fast Charger Compatible with Both 400V and 800V Automotive Battery Packs
By Mojtaba FOROUZESH [View]
[Download]

Abstract: A novel three-phase Electric Vehicle (EV) DC fast charger with a wide output voltage range is proposed in this paper. One of the main features of the proposed EV charger is that it can provide a wide output voltage range (i.e., 250 V to 850 V) using low voltage rating mainstream switches/diodes (i.e., 650 V). The proposed EV charger takes advantage of Inductor-Inductor-Capacitor (LLC) resonant tanks for each phase allowing soft-switching performance for all switches so the major power loss will be only conduction loss. Consequently, by operating at a high switching frequency the size of passive components can be reduced leading to a high-power density. Moreover, as the AC to DC conversion is being realized in an isolated single-stage approach, the total conversion efficiency for the proposed EV charger is higher than conventional two-stage EV chargers. The analysis of the power circuit design and control of the proposed EV fast charger is provided in the paper for both 400 V and 800 V automotive battery systems. Moreover, the performance is verified by computer simulation results and experimental results of a 1.5 kW laboratory prototype.

   Analytic calculation of touch and leakage currents of non-isolated EV chargers using a fast common mode calculation method and non-ideal passive component models
By Christian STUTZ [View]
[Download]

Abstract: Non-isolated charging systems suffer from tremendous touch currents due to the significant extension of the common mode coupling path by the electric vehicle. Since safety limits are very tough, the selection of converter topology, modulation scheme and filters with respect to touch current behavior is a very ambitious process. With the aim to ease integral system design, research is done for common mode analysis methods, eliminating the demand for long duration time domain simulations. A time saving method to analyze the touch current behavior in common mode domain is applied on a single stage charging system setup by a 3-level converter, filter system and a major coupling path. Furthermore, this paper improves that time-saving failure current prediction method by including the influence of non-ideal passive component models on the calculation result. All calculation results are compared to laboratory measurements. Border conditions from corresponding standards are used to define the required frequency range. Besides the touch current, which typically occurs during the failure condition of a broken protective earth conductor, the leakage current flowing in the protective earth conductor during normal operation is analyzed. Finally, this paper points out the influence of an internal common mode bypass via the filter system on the touch and leakage current.

   Dynamic Wireless Power Transfer DWPT Time Domain model: xyz position and speed coupling effect
By Iosu AIZPURU [View]
[Download]

Abstract: The paper presents a DWPT system time domain model which considers speed (___,___,___) and position (__,__,__) coupling effects. The speed effect compared to static WPT, presents an active behavior that should be considered during the coil design stage. The model is generalized and validated for resonant WPT systems and dynamic speed influenced DWPT systems.

   Onboard ESU Sizing and Dynamic IPT Charging Scenarios for a Tramway Application
By Endika BILBAO MURUAGA [View]
[Download]

Abstract: In this paper a battery based Energy Storage Unit (ESU) sizing methodology is proposed for tramwayapplications. At the same time, the required recharging system is also defined. For that, a tramway ismodeled to define power and energy requirements. Then, the methodology is applied to obtain a set ofsolutions for LTO (power oriented) and sLFP (energy oriented) cell technologies, as well as, static anddynamic wireless recharging systems. The objective is to size the required system using batteries and itsassociated recharging system as an ESU for 15-year operation.

   Proposition and Comparison of Several Solutions for High Induced Voltage across Inactive Transmitting coils in a Series-Series Compensation DIPT System
By Wassim KABBARA [View]
[Download]

Abstract: Dynamic inductive power transfer technology (DIPT) has recently seen significant development. It isproposed as an alternative solution for increasing the range of electrical vehicles (EV) while decreasingthe battery size. Transmitting coils located under the road transfer the power to a receiving coilintegrated within the moving EV by inductive coupling. In a series-series DIPT system with multipletransmitting coils, a high induced voltage can occur on the adjacent inactive transmitting coils, thuscreating numerous risks. This high induced voltage risks reinjecting power to the grid and thussignificantly decreases the system's performance and efficiency. In this article, we present and compareseveral solutions for the high-induced voltage problem. A four-quadrant switch is designed, modeled,and realized based on two technologies: Saturable reactor and IGBT transistors. Then the 4Q-switchsolution is compared with the short-circuiting method. Experimental validation is performed using aseries-series DIPT platform using a 300 W resistive load with variable frequency control.

EPE 2022 - DS2p: Vehicle Battery Chargers: Contact and Contactless
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2022 ECCE Europe - Conference > EPE 2022 - Topic 08: Electric Vehicle Propulsion Systems and their Energy Storage > EPE 2022 - DS2p: Vehicle Battery Chargers: Contact and Contactless
	[return to parent folder]

	A Novel Dual CC-CV Output Wireless EV Charger With Minimal Dependency on Both Coil Coupling and Load Variation By Subhranil BARMAN	[View] [Download]
Abstract: Robust and efficient wireless EV charging requires load and coupling independent CC and CV modes. Existing literature focus either on CC or CV mode. The characteristics of the schemes which cater to both the modes are affected by load and coupling coefficient. In this paper, an improved dual output charger topology is proposed that is maximally independent from variations in coil coupling and load. Relevant analysis and simulation results are shown to validate the working of the proposed topology.

	A Reconfigurable Single-Stage Three-Phase Electric Vehicle DC Fast Charger Compatible with Both 400V and 800V Automotive Battery Packs By Mojtaba FOROUZESH	[View] [Download]
Abstract: A novel three-phase Electric Vehicle (EV) DC fast charger with a wide output voltage range is proposed in this paper. One of the main features of the proposed EV charger is that it can provide a wide output voltage range (i.e., 250 V to 850 V) using low voltage rating mainstream switches/diodes (i.e., 650 V). The proposed EV charger takes advantage of Inductor-Inductor-Capacitor (LLC) resonant tanks for each phase allowing soft-switching performance for all switches so the major power loss will be only conduction loss. Consequently, by operating at a high switching frequency the size of passive components can be reduced leading to a high-power density. Moreover, as the AC to DC conversion is being realized in an isolated single-stage approach, the total conversion efficiency for the proposed EV charger is higher than conventional two-stage EV chargers. The analysis of the power circuit design and control of the proposed EV fast charger is provided in the paper for both 400 V and 800 V automotive battery systems. Moreover, the performance is verified by computer simulation results and experimental results of a 1.5 kW laboratory prototype.

	Analytic calculation of touch and leakage currents of non-isolated EV chargers using a fast common mode calculation method and non-ideal passive component models By Christian STUTZ	[View] [Download]
Abstract: Non-isolated charging systems suffer from tremendous touch currents due to the significant extension of the common mode coupling path by the electric vehicle. Since safety limits are very tough, the selection of converter topology, modulation scheme and filters with respect to touch current behavior is a very ambitious process. With the aim to ease integral system design, research is done for common mode analysis methods, eliminating the demand for long duration time domain simulations. A time saving method to analyze the touch current behavior in common mode domain is applied on a single stage charging system setup by a 3-level converter, filter system and a major coupling path. Furthermore, this paper improves that time-saving failure current prediction method by including the influence of non-ideal passive component models on the calculation result. All calculation results are compared to laboratory measurements. Border conditions from corresponding standards are used to define the required frequency range. Besides the touch current, which typically occurs during the failure condition of a broken protective earth conductor, the leakage current flowing in the protective earth conductor during normal operation is analyzed. Finally, this paper points out the influence of an internal common mode bypass via the filter system on the touch and leakage current.

	Dynamic Wireless Power Transfer DWPT Time Domain model: xyz position and speed coupling effect By Iosu AIZPURU	[View] [Download]
Abstract: The paper presents a DWPT system time domain model which considers speed (___,___,___) and position (__,__,__) coupling effects. The speed effect compared to static WPT, presents an active behavior that should be considered during the coil design stage. The model is generalized and validated for resonant WPT systems and dynamic speed influenced DWPT systems.

	Onboard ESU Sizing and Dynamic IPT Charging Scenarios for a Tramway Application By Endika BILBAO MURUAGA	[View] [Download]
Abstract: In this paper a battery based Energy Storage Unit (ESU) sizing methodology is proposed for tramwayapplications. At the same time, the required recharging system is also defined. For that, a tramway ismodeled to define power and energy requirements. Then, the methodology is applied to obtain a set ofsolutions for LTO (power oriented) and sLFP (energy oriented) cell technologies, as well as, static anddynamic wireless recharging systems. The objective is to size the required system using batteries and itsassociated recharging system as an ESU for 15-year operation.

	Proposition and Comparison of Several Solutions for High Induced Voltage across Inactive Transmitting coils in a Series-Series Compensation DIPT System By Wassim KABBARA	[View] [Download]
Abstract: Dynamic inductive power transfer technology (DIPT) has recently seen significant development. It isproposed as an alternative solution for increasing the range of electrical vehicles (EV) while decreasingthe battery size. Transmitting coils located under the road transfer the power to a receiving coilintegrated within the moving EV by inductive coupling. In a series-series DIPT system with multipletransmitting coils, a high induced voltage can occur on the adjacent inactive transmitting coils, thuscreating numerous risks. This high induced voltage risks reinjecting power to the grid and thussignificantly decreases the system's performance and efficiency. In this article, we present and compareseveral solutions for the high-induced voltage problem. A four-quadrant switch is designed, modeled,and realized based on two technologies: Saturable reactor and IGBT transistors. Then the 4Q-switchsolution is compared with the short-circuiting method. Experimental validation is performed using aseries-series DIPT platform using a 300 W resistive load with variable frequency control.