EPE Association: EPE 2017 - LS6f: EV's Battery chargers: Contact and Contactless

EPE 2017 - LS6f: EV's Battery chargers: Contact and Contactless
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2017 ECCE Europe - Conference > EPE 2017 - Topic 08: e-Mobility > EPE 2017 - LS6f: EV's Battery chargers: Contact and Contactless

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   A Simple Technique To Optimize SiC Device Selection For Minimum Loss
By Nina ROSCOE [View]
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Abstract: SiC devices are now achieving voltage and current ratings which challenge applications previously dominated by IGBTs. Unlike with IGBTs parallel connection of SiC devices may be used to reduce conduction losses. SiC conduction loss is reduced with low Rds(on), or large die area, while switching loss reduction requires small Coss, and small die area. An improved analytical model is presented to accurately predict SiC switching loss. Extensive experimental data is used to verify the accuracy of the model for two different SiC devices. This paper then presents a simple technique for identifying optimum Rds(on) at a given switching frequency using a Figure of Merit (FOM) for SiC. The FOM is then used in a simple model to approximate SiC losses and is combined with a simple filter model to attempt to identify optimum switching frequency, and this is compared with the full model. It is shown that the FOM model comes close to predicting optimum switching frequency, but the full model must be used to accurately pinpoint optimum switching frequency. The FOM technique therefore has value in identifying optimum die area and device choice so that the full, more complex model need only be implemented once.

   Design considerations for a misalignment tolerant wireless inductive power system for electric vehicle (EV) charging
By Soumya BANDYOPADHYAY [View]
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Abstract: Misalignment during wireless charging of electric vehicles can lead to low efficiency (less than 85\%) of power transferwhich can lead to thermal issues and high leakage fields. This paper explores the most optimal solutiontowards a misalignment tolerant system. To that end, a DD-DDQ coil system with series-seriescompensation combined with an impedance matching control algorithm is explored. A multi-objectiveoptimization approach is presented to visualize the trade-off between the design aspects which result inhigh misalignment tolerance. Finally, the results are compared with DD-DD coil designs to quantify theadvantage of the proposed system.

   Design, Modeling and Control of a Bidirectional Wireless Power Transfer for Light-Duty Vehicles: G2V and V2G Systems
By Yang YANG [View]
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Abstract: Design approach and control strategy have a significant impact on the performance of the wireless power transfer systems in electric vehicles powertrains in terms of efficiency, charging power, charging modes (i.e. G2V and V2G) and charging time, etc. Thus, this paper proposes new design methodology and control system for a bidirectional 3.7 kW wireless power-transfer (WPT) of light-duty electric vehicles (EVs); operating at frequency 85 kHz and at frequency 140 kHz. In this paper, Series/Series (SS) WPT compensation topology is optimally designed and controlled for G2V and V2G modes using MATLAB/Simulink. A simulation study is performed for a selected WPT for both G2V and V2G operating modes to ensure its functionality and performance at different switching frequencies. Moreover, the impact on the grid quality is investigated for both operation modes.

   Minimizing Coil Power Loss in a Direct AC/AC Converter-based Contactless Electric Vehicle Charger
By Ferdi Perdana KUSUMAH [View]
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Abstract: This paper explains an optimum load analysis to reduce power loss in a direct AC/AC converter-based contactless electric vehicle charger. The converter has a fewer number of bi-directional switches than a matrix converter and it uses a resonant circuit to utilize zero-current switching. Output power and power loss depend on coupling factor and output load. A proper load value leads to low loss and maximum transmission efficiency. The value was derived using an iterative-based Weierstrass' method due to converter dynamic switching frequency. Other parameters such as link efficiency, link gain and power loss ratio were derived based on steady-state analysis. Simulation results are then presented to validate the theoretical analyses.

EPE 2017 - LS6f: EV's Battery chargers: Contact and Contactless
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2017 ECCE Europe - Conference > EPE 2017 - Topic 08: e-Mobility > EPE 2017 - LS6f: EV's Battery chargers: Contact and Contactless
	[return to parent folder]

	A Simple Technique To Optimize SiC Device Selection For Minimum Loss By Nina ROSCOE	[View] [Download]
Abstract: SiC devices are now achieving voltage and current ratings which challenge applications previously dominated by IGBTs. Unlike with IGBTs parallel connection of SiC devices may be used to reduce conduction losses. SiC conduction loss is reduced with low Rds(on), or large die area, while switching loss reduction requires small Coss, and small die area. An improved analytical model is presented to accurately predict SiC switching loss. Extensive experimental data is used to verify the accuracy of the model for two different SiC devices. This paper then presents a simple technique for identifying optimum Rds(on) at a given switching frequency using a Figure of Merit (FOM) for SiC. The FOM is then used in a simple model to approximate SiC losses and is combined with a simple filter model to attempt to identify optimum switching frequency, and this is compared with the full model. It is shown that the FOM model comes close to predicting optimum switching frequency, but the full model must be used to accurately pinpoint optimum switching frequency. The FOM technique therefore has value in identifying optimum die area and device choice so that the full, more complex model need only be implemented once.

	Design considerations for a misalignment tolerant wireless inductive power system for electric vehicle (EV) charging By Soumya BANDYOPADHYAY	[View] [Download]
Abstract: Misalignment during wireless charging of electric vehicles can lead to low efficiency (less than 85\%) of power transferwhich can lead to thermal issues and high leakage fields. This paper explores the most optimal solutiontowards a misalignment tolerant system. To that end, a DD-DDQ coil system with series-seriescompensation combined with an impedance matching control algorithm is explored. A multi-objectiveoptimization approach is presented to visualize the trade-off between the design aspects which result inhigh misalignment tolerance. Finally, the results are compared with DD-DD coil designs to quantify theadvantage of the proposed system.

	Design, Modeling and Control of a Bidirectional Wireless Power Transfer for Light-Duty Vehicles: G2V and V2G Systems By Yang YANG	[View] [Download]
Abstract: Design approach and control strategy have a significant impact on the performance of the wireless power transfer systems in electric vehicles powertrains in terms of efficiency, charging power, charging modes (i.e. G2V and V2G) and charging time, etc. Thus, this paper proposes new design methodology and control system for a bidirectional 3.7 kW wireless power-transfer (WPT) of light-duty electric vehicles (EVs); operating at frequency 85 kHz and at frequency 140 kHz. In this paper, Series/Series (SS) WPT compensation topology is optimally designed and controlled for G2V and V2G modes using MATLAB/Simulink. A simulation study is performed for a selected WPT for both G2V and V2G operating modes to ensure its functionality and performance at different switching frequencies. Moreover, the impact on the grid quality is investigated for both operation modes.

	Minimizing Coil Power Loss in a Direct AC/AC Converter-based Contactless Electric Vehicle Charger By Ferdi Perdana KUSUMAH	[View] [Download]
Abstract: This paper explains an optimum load analysis to reduce power loss in a direct AC/AC converter-based contactless electric vehicle charger. The converter has a fewer number of bi-directional switches than a matrix converter and it uses a resonant circuit to utilize zero-current switching. Output power and power loss depend on coupling factor and output load. A proper load value leads to low loss and maximum transmission efficiency. The value was derived using an iterative-based Weierstrass' method due to converter dynamic switching frequency. Other parameters such as link efficiency, link gain and power loss ratio were derived based on steady-state analysis. Simulation results are then presented to validate the theoretical analyses.