EPE Association: EPE 2019 - LS6e: Industrial Power Converters for Electric Vehicles

EPE 2019 - LS6e: Industrial Power Converters for Electric Vehicles
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2019 ECCE Europe - Conference > EPE 2019 - Topic 08: Electric Vehicle Propulsion Systems and their Energy Storage > EPE 2019 - LS6e: Industrial Power Converters for Electric Vehicles

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   Concept design and performance assessment of an electric powertrain for a L7e category vehicle
By Alberto LEGA [View]
[Download]

Abstract: Global legislation about CO2 and non-CO2 polluting emissions is getting stricter and stricter leadingOriginal Equipment Manufacturer (OEM) to propose new powertrain topologies in order to fulfil newregulations avoiding therefore possible fees. Nevertheless, local legislation regulating accesses forpolluting vehicles to particularly congested areas, once limited to big cities centres, are now extendedalso to towns creating further obstacles people movement and to goods delivery.Powertrains electrification is playing a major role in the clean power solution scenario because of thewide efficiency improvement capabilities and scalability of components behaviours towards drivelinearchitectures despite the technology assessment shows some weakness: even if motors, inverters andelectric control devices have borrowed main characteristics to adjacent industrial and railway fields,they shall improve to implement automotive peculiar features at achievable prices. Nevertheless, cellsare the weakest components because chemistry technology of the accumulator: even if cells ensure agood performance ration in terms of energy density, recharge time is still too long and energydistribution infrastructure is blossoming nowadays creating the so called 'range anxiety' on potentialcustomers.Present paper proposes an outlook on efficient Battery Electric Vehicle (BEV) for L7e category(named EPIC0) aimed to commercial use in particular for good delivery in cities restricted areas orinside industrial plants.

   EV BMS with Distributed Switch Matrix for Active Balancing, Online Electrochemical Impedance Spectroscopy, and Auxiliary Power Supply
By Zhe GONG [View]
[Download]

Abstract: A distributed switch matrix is proposed that enables balancing of series-connected groups of batterycells in a pack through dc-dc converters. The switch matrix is used to develop a multi-function electricvehicle Battery Management System (BMS) that features active cell balancing, online electrochemical impedance spectroscopy, and 12V auxiliary bus power supply. The BMS is designed for 6S2P,88Ah custom liquid-cooled modules. A prototype system is demonstrated using a 1S2P, 0.5mO nominalimpedance battery unit. Bidirectional active balancing operates at 2.5A while power is exchanged withthe auxiliary bus. The 88Ah battery impedance is measured from 11 to 2000Hz for a varying range oftemperatures. Based on a Monte-Carlo battery pack simulation under randomised cell capacity imbalance, an estimated 20\% average increase in usable pack capacity can be achieved with active balancingengaged.

   Fast Current Control of the Single-phase DC-AC Converter Using Digital Peak Current Mode Control
By Naoto KOBAYASHI [View]
[Download]

Abstract: Peak current mode controlled converters can be made in a small size because it has fast response tosuppress overshoot current, which can decrease the maximum rated current of various components such as a grid interconnected reactor, switching devices, etc. This paper presents a digital peak current mode controlled single-phase DC-AC converter with a new current control method which can reduce harmonic distortion of output current. This converter is mainly composed of a half-bridge at DC input side, full-bridge at AC output side and a reactor which is connected to the two bridges. The new current control method can estimate and compensate the drop of reactor current which is caused by current ripple and slope compensation. We performed experiments using a prototype converter rated at 3.3kW. The results showed that the proposed method could reduce the harmonic distortion of the output current. Furthermore, the effectiveness for suppression of overshoot current caused by disturbance of the AC grid voltage is also verified.

   Proposal of Integrated Structure with Boost Motor Drive and On-board Charging for 48 V Battery System
By Teck Chiang GOH [View]
[Download]

Abstract: An integrated circuit structure is proposed for a 48V power system. This paper discusses the operating principle of the proposed circuit and the control algorithms. The circuit structure integrates a boost motor drive with a three-phase AC on-board charger (OBC). An integrated magnetic device (IMD) that consists of two functionalities is used in the boost converter, where the IMD is performed as a boost inductor during motor drive and also performed as an isolated transformer during AC charging, respectively. Then a matrix converter is used in the OBC to reduce the capacitive component. As a result, the overall circuit structure is only consisting of one capacitive and two inductive components (IMD and grid inductor). A 3kW A4 size prototype was developed and tested in order to validate the performance of the proposed circuit. From the results, the conversion efficiency achieves 94\% for boost motor drive and 93\% for a three-phase AC charging.

EPE 2019 - LS6e: Industrial Power Converters for Electric Vehicles
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2019 ECCE Europe - Conference > EPE 2019 - Topic 08: Electric Vehicle Propulsion Systems and their Energy Storage > EPE 2019 - LS6e: Industrial Power Converters for Electric Vehicles
	[return to parent folder]

	Concept design and performance assessment of an electric powertrain for a L7e category vehicle By Alberto LEGA	[View] [Download]
Abstract: Global legislation about CO2 and non-CO2 polluting emissions is getting stricter and stricter leadingOriginal Equipment Manufacturer (OEM) to propose new powertrain topologies in order to fulfil newregulations avoiding therefore possible fees. Nevertheless, local legislation regulating accesses forpolluting vehicles to particularly congested areas, once limited to big cities centres, are now extendedalso to towns creating further obstacles people movement and to goods delivery.Powertrains electrification is playing a major role in the clean power solution scenario because of thewide efficiency improvement capabilities and scalability of components behaviours towards drivelinearchitectures despite the technology assessment shows some weakness: even if motors, inverters andelectric control devices have borrowed main characteristics to adjacent industrial and railway fields,they shall improve to implement automotive peculiar features at achievable prices. Nevertheless, cellsare the weakest components because chemistry technology of the accumulator: even if cells ensure agood performance ration in terms of energy density, recharge time is still too long and energydistribution infrastructure is blossoming nowadays creating the so called 'range anxiety' on potentialcustomers.Present paper proposes an outlook on efficient Battery Electric Vehicle (BEV) for L7e category(named EPIC0) aimed to commercial use in particular for good delivery in cities restricted areas orinside industrial plants.

	EV BMS with Distributed Switch Matrix for Active Balancing, Online Electrochemical Impedance Spectroscopy, and Auxiliary Power Supply By Zhe GONG	[View] [Download]
Abstract: A distributed switch matrix is proposed that enables balancing of series-connected groups of batterycells in a pack through dc-dc converters. The switch matrix is used to develop a multi-function electricvehicle Battery Management System (BMS) that features active cell balancing, online electrochemical impedance spectroscopy, and 12V auxiliary bus power supply. The BMS is designed for 6S2P,88Ah custom liquid-cooled modules. A prototype system is demonstrated using a 1S2P, 0.5mO nominalimpedance battery unit. Bidirectional active balancing operates at 2.5A while power is exchanged withthe auxiliary bus. The 88Ah battery impedance is measured from 11 to 2000Hz for a varying range oftemperatures. Based on a Monte-Carlo battery pack simulation under randomised cell capacity imbalance, an estimated 20\% average increase in usable pack capacity can be achieved with active balancingengaged.

	Fast Current Control of the Single-phase DC-AC Converter Using Digital Peak Current Mode Control By Naoto KOBAYASHI	[View] [Download]
Abstract: Peak current mode controlled converters can be made in a small size because it has fast response tosuppress overshoot current, which can decrease the maximum rated current of various components such as a grid interconnected reactor, switching devices, etc. This paper presents a digital peak current mode controlled single-phase DC-AC converter with a new current control method which can reduce harmonic distortion of output current. This converter is mainly composed of a half-bridge at DC input side, full-bridge at AC output side and a reactor which is connected to the two bridges. The new current control method can estimate and compensate the drop of reactor current which is caused by current ripple and slope compensation. We performed experiments using a prototype converter rated at 3.3kW. The results showed that the proposed method could reduce the harmonic distortion of the output current. Furthermore, the effectiveness for suppression of overshoot current caused by disturbance of the AC grid voltage is also verified.

	Proposal of Integrated Structure with Boost Motor Drive and On-board Charging for 48 V Battery System By Teck Chiang GOH	[View] [Download]
Abstract: An integrated circuit structure is proposed for a 48V power system. This paper discusses the operating principle of the proposed circuit and the control algorithms. The circuit structure integrates a boost motor drive with a three-phase AC on-board charger (OBC). An integrated magnetic device (IMD) that consists of two functionalities is used in the boost converter, where the IMD is performed as a boost inductor during motor drive and also performed as an isolated transformer during AC charging, respectively. Then a matrix converter is used in the OBC to reduce the capacitive component. As a result, the overall circuit structure is only consisting of one capacitive and two inductive components (IMD and grid inductor). A 3kW A4 size prototype was developed and tested in order to validate the performance of the proposed circuit. From the results, the conversion efficiency achieves 94\% for boost motor drive and 93\% for a three-phase AC charging.