EPE Association: EPE 2019 - LS5e: Wireless Charging

EPE 2019 - LS5e: Wireless Charging
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 - LS5e: Wireless Charging

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   A PCB Integrated Winding Using a Litz Structure for a Wireless Charging Coil
By Philipp REHLAENDER [View]
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Abstract: The market of electric vehicles has experienced a rapid growth in the recent time due to global warming, increasing oil prices and pollution regulations. Wireless charging has gained recent attention through the increased customer convenience and the higher robustness compared to conventional charging systems. A key design factor for the vehicular coil is the limited space - thus, high power density is mandatory. This paper presents a novel planar secondary coil design. The utilization of PCBs interconnected by soldering pins results in a very cheap design while having a low height. To overcome high conductions losses, the PCB utilizes litz wires designed using FEM analysis. A three-step design procedure is described. In a first step, different litz wire geometries are compared. In a second step, the PCB's height is optimized to minimize losses for the chosen geometry. Finally, the strand width is chosen according to a loss optimization. The produced prototype shows a significant reduction of the winding losses by more than 50 \% compared to the non-litz design.

   Efficiency improvement of a wireless power transfer system using a receiver side voltage doubling rectifier
By Mehanathan PATHMANATHAN [View]
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Abstract: This paper proposes the implementation of a receiver-side voltage doubler into a WPT (wireless power transfer) charging system to reduce the transmitter currents at the cost of increased receiver current for a fixed power transfer level. For a WPT system with a multi-coil transmitter and simple receiver, this results in an efficiency improvement due to the overall reduction in copper losses. A WPT system with a three-coil transmitter and single coil receiver is investigated, and up to a 13\% system coil efficiency improvement was obtained from simulations for 3.3 kW output power with a receiver-side voltage doubler compared to if a standard full-bridge rectifier was used. Experimental results were then obtained for a reduced scale 1 kW WPT system using a voltage doubler, validating the performance of the applied models.

   LCLC resonant converter with PWM control
By Alberto M. PERNÍA [View]
[Download]

Abstract: This paper describes the theoretical and practical aspects of an LCLC resonant topology, operating at constant frequency (PWM control). This topology combines the behavior of LLC and LCC converters, introducing the advantage of reducing the value of the series resonant inductor to get high power factor for the resonant tank. The inclusion of a new resonant element, the parallel capacitor, allows reducing the resonant current through the magnetizing inductance, thus reducing the power losses in the transformer. Although part of the transformer losses are transferred to the parallel resonant capacitor, they can be minimized with a correct selection of this resonant component.

   Sensorless Vehicle Detection for Dynamic Wireless Power Transfer
By Karim KADEM [View]
[Download]

Abstract: A sensorless dynamic charging vehicle detection technic using only the transmitting and receiving coils is proposed. It consists in sending a current pulse using the transmitting coil. To improve the vehicle detection, the receiver coil may also send the same pulse. A simulation and experimental tests are carried out to validate this strategy.

EPE 2019 - LS5e: Wireless Charging
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 - LS5e: Wireless Charging
	[return to parent folder]

	A PCB Integrated Winding Using a Litz Structure for a Wireless Charging Coil By Philipp REHLAENDER	[View] [Download]
Abstract: The market of electric vehicles has experienced a rapid growth in the recent time due to global warming, increasing oil prices and pollution regulations. Wireless charging has gained recent attention through the increased customer convenience and the higher robustness compared to conventional charging systems. A key design factor for the vehicular coil is the limited space - thus, high power density is mandatory. This paper presents a novel planar secondary coil design. The utilization of PCBs interconnected by soldering pins results in a very cheap design while having a low height. To overcome high conductions losses, the PCB utilizes litz wires designed using FEM analysis. A three-step design procedure is described. In a first step, different litz wire geometries are compared. In a second step, the PCB's height is optimized to minimize losses for the chosen geometry. Finally, the strand width is chosen according to a loss optimization. The produced prototype shows a significant reduction of the winding losses by more than 50 \% compared to the non-litz design.

	Efficiency improvement of a wireless power transfer system using a receiver side voltage doubling rectifier By Mehanathan PATHMANATHAN	[View] [Download]
Abstract: This paper proposes the implementation of a receiver-side voltage doubler into a WPT (wireless power transfer) charging system to reduce the transmitter currents at the cost of increased receiver current for a fixed power transfer level. For a WPT system with a multi-coil transmitter and simple receiver, this results in an efficiency improvement due to the overall reduction in copper losses. A WPT system with a three-coil transmitter and single coil receiver is investigated, and up to a 13\% system coil efficiency improvement was obtained from simulations for 3.3 kW output power with a receiver-side voltage doubler compared to if a standard full-bridge rectifier was used. Experimental results were then obtained for a reduced scale 1 kW WPT system using a voltage doubler, validating the performance of the applied models.

	LCLC resonant converter with PWM control By Alberto M. PERNÍA	[View] [Download]
Abstract: This paper describes the theoretical and practical aspects of an LCLC resonant topology, operating at constant frequency (PWM control). This topology combines the behavior of LLC and LCC converters, introducing the advantage of reducing the value of the series resonant inductor to get high power factor for the resonant tank. The inclusion of a new resonant element, the parallel capacitor, allows reducing the resonant current through the magnetizing inductance, thus reducing the power losses in the transformer. Although part of the transformer losses are transferred to the parallel resonant capacitor, they can be minimized with a correct selection of this resonant component.

	Sensorless Vehicle Detection for Dynamic Wireless Power Transfer By Karim KADEM	[View] [Download]
Abstract: A sensorless dynamic charging vehicle detection technic using only the transmitting and receiving coils is proposed. It consists in sending a current pulse using the transmitting coil. To improve the vehicle detection, the receiver coil may also send the same pulse. A simulation and experimental tests are carried out to validate this strategy.