EPE Association: EPE 2023 - LS5d: Vehicle Battery Chargers & Powertrain

EPE 2023 - LS5d: Vehicle Battery Chargers & Powertrain
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2023 ECCE Europe - Conference > EPE 2023 - Topic 08: Electric Vehicle Propulsion Systems and their Energy Storage > EPE 2023 - LS5d: Vehicle Battery Chargers & Powertrain

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   An EV Drivetrain Integrated Auxiliary Battery Charger using a Dual Wound Three Phase Synchronous Machine
By Sukhjit SINGH, Chatumal PERERA, Caniggia VIANA, Peter LEHN [View]
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Abstract: An electric vehicle (EV) drivetrain integrated auxiliary battery charger is presented, eliminating the need for a separate auxiliary converter. Energy for the auxiliary battery is harvested from the switching ripple existing within the drivetrain. The topology adds a medium frequency isolation transformer, an LC resonant tank and a diode rectifier to a dual wound synchronous machine drivetrain, a drive common for medium and heavy duty vehicles (MHDV). The proposed topology allows auxiliary battery charging without interfering with the drivetrain operation. A 984W, 200V/12V experimental concept validation is provided.

   Analytical and Experimental Efficiency Evaluation of a Voltage Balancer Based Three-Phase Unfolding EV Powertrain
By Mohammad Saleh KHAN, Soumya Shubhra NAG, Anandarup DAS [View]
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Abstract: Three-phase unfolding based converters have emerged as promising solutions for achieving two-stage dc to three-phase ac conversion, particularly for electric vehicle (EV) powertrains. This paper presents a comprehensive loss model of a novel non-isolated buck-boost three-phase unfolding based powertrain. The proposed converter incorporates a voltage balancer circuit in the dc-dc stage to generate the required varying dc-link voltages, subsequently unfolded by the unfolder stage operating at motor fundamental frequency. The paper outlines the analytical characterization of the system currents, followed by detailed calculations of semiconductor and inductor losses. Experimental measurements conducted on a hardware prototype affirm the accuracy of the analysis, demonstrating peak efficiencies surpassing 98\% for power levels up to 5 kW.

   Switching Loss Reduction for an Active Buffer DAB AC-DC Converter
By Sindisiwe MALANDA, Kain ARAI, Shohei KOMEDA, Hiroyasu KIFUNE, Shunsuke TAKUMA, Yoshiya OHNUMA [View]
[Download]

Abstract: This paper proposes a new control method which can reduce a switching loss for an active buffer dual-active-bridge (DAB) AC-DC converter. The proposed control method extends a conventional phase-shifted control method for the DAB converter to control the power from the single-phase AC line and buffer capacitor to absorb the power pulsation into the buffer capacitor. The required phase-shift angle and switching frequency of the DAB converter are theoretically obtained to realize a constant output power, a sinusoidal AC-line current, and a regulated buffer capacitor voltage at the same time. Experimental results demonstrate the operation of the DAB converter with reducing the number of switching of the discharging switch to half, and thus, the power conversion efficiency has been improved from 93.4\% to 94.4\% at the 5.5-kW output.

EPE 2023 - LS5d: Vehicle Battery Chargers & Powertrain
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2023 ECCE Europe - Conference > EPE 2023 - Topic 08: Electric Vehicle Propulsion Systems and their Energy Storage > EPE 2023 - LS5d: Vehicle Battery Chargers & Powertrain
	[return to parent folder]

	An EV Drivetrain Integrated Auxiliary Battery Charger using a Dual Wound Three Phase Synchronous Machine By Sukhjit SINGH, Chatumal PERERA, Caniggia VIANA, Peter LEHN	[View] [Download]
Abstract: An electric vehicle (EV) drivetrain integrated auxiliary battery charger is presented, eliminating the need for a separate auxiliary converter. Energy for the auxiliary battery is harvested from the switching ripple existing within the drivetrain. The topology adds a medium frequency isolation transformer, an LC resonant tank and a diode rectifier to a dual wound synchronous machine drivetrain, a drive common for medium and heavy duty vehicles (MHDV). The proposed topology allows auxiliary battery charging without interfering with the drivetrain operation. A 984W, 200V/12V experimental concept validation is provided.

	Analytical and Experimental Efficiency Evaluation of a Voltage Balancer Based Three-Phase Unfolding EV Powertrain By Mohammad Saleh KHAN, Soumya Shubhra NAG, Anandarup DAS	[View] [Download]
Abstract: Three-phase unfolding based converters have emerged as promising solutions for achieving two-stage dc to three-phase ac conversion, particularly for electric vehicle (EV) powertrains. This paper presents a comprehensive loss model of a novel non-isolated buck-boost three-phase unfolding based powertrain. The proposed converter incorporates a voltage balancer circuit in the dc-dc stage to generate the required varying dc-link voltages, subsequently unfolded by the unfolder stage operating at motor fundamental frequency. The paper outlines the analytical characterization of the system currents, followed by detailed calculations of semiconductor and inductor losses. Experimental measurements conducted on a hardware prototype affirm the accuracy of the analysis, demonstrating peak efficiencies surpassing 98\% for power levels up to 5 kW.

	Switching Loss Reduction for an Active Buffer DAB AC-DC Converter By Sindisiwe MALANDA, Kain ARAI, Shohei KOMEDA, Hiroyasu KIFUNE, Shunsuke TAKUMA, Yoshiya OHNUMA	[View] [Download]
Abstract: This paper proposes a new control method which can reduce a switching loss for an active buffer dual-active-bridge (DAB) AC-DC converter. The proposed control method extends a conventional phase-shifted control method for the DAB converter to control the power from the single-phase AC line and buffer capacitor to absorb the power pulsation into the buffer capacitor. The required phase-shift angle and switching frequency of the DAB converter are theoretically obtained to realize a constant output power, a sinusoidal AC-line current, and a regulated buffer capacitor voltage at the same time. Experimental results demonstrate the operation of the DAB converter with reducing the number of switching of the discharging switch to half, and thus, the power conversion efficiency has been improved from 93.4\% to 94.4\% at the 5.5-kW output.