Thermal Simulation and Optimization Study for Magnetic Coupler of Static Electric Vehicle Wireless Power Transfer Systems

Zhu, Chunbo; Fu, Chaoye; Wang, De’an; Xiao-hua, Huang; Zhang, Hailong; Dong, Shuai; Wei, Guo; Song, Kai

doi:10.1109/icems.2019.8921715

Cited by 14 publications

(3 citation statements)

References 5 publications

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“…A high-current wireless charging system uses a high-power density coil, which has high loss and causes the coil temperature to rise. If the temperature of the system is too high, it will affect the material properties of the magnetic core, reduce the coupling of the primary and secondary side coils, affect the transmission efficiency of the system, and cause a lot of security risks [23][24][25]. The loss of the system is obtained through finite element simulation, and then the temperature of the coupling mechanism can be obtained through thermal simulation.…”

Section: Introductionmentioning

confidence: 99%

Research on the Multiple Capacitor Current Sharing of High-Current Receiving Coils in a Series–Series Wireless Charging System

Xie,

Cai,

et al. 2024

WEVJ

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In order to improve wireless charging power and reduce heating problems, the optimal design of the high-current wireless charging coil has always been the research focus of wireless charging system research. This paper proposes a multi-branch and multi-capacitance current sharing method for series–series (SS) receiving coils. Firstly, the current sharing model with n branches that are connected parallel to multiple compensation capacitors is established. The current sharing situation of parallel coils with three branches and three capacitors with independently resonant compensation is analyzed. Then, the wireless charging system with the parallel coils of 48 V/100 A receiving coils is simulated. The results show that when one capacitor is used for compensation, the three-coil currents highly differ; when three capacitors are compensated independently, the three-coil currents are basically equal. The simulation results show that the current sharing method can effectively improve the charging power of the system and reduce the maximum temperature of the receiving coil, which proves the effectiveness of this method. Finally, through the experimental comparison, it is verified that the current sharing measure can make the current of each wire basically equal.

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Section: Introductionmentioning

confidence: 99%

Research on the Multiple Capacitor Current Sharing of High-Current Receiving Coils in a Series–Series Wireless Charging System

Xie,

Cai,

et al. 2024

WEVJ

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“…The thermal management of CPMs featuring a high volumetric power density is a major challenge [7][8][9]. The local proximity of the coil, ferrites and shielding, being the main generators of the power losses of CPMs, is very challenging [7,10,11].…”

Section: Introductionmentioning

confidence: 99%

Multiphysics Investigation of an UltrathinVehicular Wireless Power Transfer Module for Electric Vehicles

Helwig

Zimmer

Lucas³

et al. 2021

Sustainability

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The functional and spatial integration of a wireless power transfer system (WPTS) into electric vehicles is a challenging task, due to complex multiphysical interactions and strict constraints such as installation space limitations or shielding requirements. This paper presents an electromagnetic–thermal investigation of a novel design approach for an ultrathin onboard receiver unit for a WPTS, comprising the spatial and functional integration of the receiver coil, ferromagnetic sheet and metal mesh wire into a vehicular underbody cover. To supplement the complex design process, two-way coupled electromagnetic–thermal simulation models were developed. This included the systematic and consecutive modelling, as well as experimental validation of the temperature- and frequency-dependent material properties at the component, module and system level. The proposed integral design combined with external power electronics resulted in a module height of only 15mm. The module achieved a power of up to 7.2 kW at a transmission frequency of f0=85kHz with a maximum efficiency of 92% over a transmission distance of 110mm to 160mm. The proposed simulations showed very good consistency with the experimental validation on all levels. Thus, the performed studies provide a significant contribution to coupled electromagnetic and thermal design wireless power transfer systems.

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“…Two methods were proposed in [16] to suppress the decline of system efficiency, including improving coil performance while choosing temperature-robust capacitors, and controlling temperature by applying a heat sink. Furthermore, the thermal characteristics of the magnetic coupler were investigated by simulation [17]. The results showed that the thermal performance of the magnetic coupler could be improved by adequately adjusting the mechanical structure and materials within the allowable range of electrical parameters under the condition of natural cooling.…”

Section: Introductionmentioning

confidence: 99%

Determining the Optimal Range of Coupling Coefficient to Suppress Decline in WPTS Efficiency Due to Increased Resistance With Temperature Rise

Zhao

Wang

Eldeeb

et al. 2020

IEEE Open J. Ind. Electron. Soc.

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The continuous operation of the wireless power transfer system (WPTS) under high-frequency switching activity might cause a temperature rise in various system's components. That temperature rise might increase the resistance of the primary and secondary coils, which will lead to a significant decline in the system's efficiency. To address this problem at the design stage, we investigate the optimal range of the coupling coefficient that suppresses the efficiency drop due to the increasing resistance of the WPTS components. The proposed optimal range of the coupling coefficient can also ensure the output power requirements of the WPTS. Using four different WPTSs, the determination method for the optimal range of coupling coefficients under different system operational frequencies was developed and implemented. A 3-kW resonant experimental prototype WPTS was designed and built to validate the proposed coupling coefficients experimentally. The experimental results show that the optimized coupling range successfully suppressed the efficiency decline resulting from the increasing resistance caused by temperature rise. INDEX TERMS Wireless power transfer system (WPTS), efficiency, temperature rise, optimal coupling coefficient.

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Thermal Simulation and Optimization Study for Magnetic Coupler of Static Electric Vehicle Wireless Power Transfer Systems

Cited by 14 publications

References 5 publications

Research on the Multiple Capacitor Current Sharing of High-Current Receiving Coils in a Series–Series Wireless Charging System

Research on the Multiple Capacitor Current Sharing of High-Current Receiving Coils in a Series–Series Wireless Charging System

Multiphysics Investigation of an UltrathinVehicular Wireless Power Transfer Module for Electric Vehicles

Determining the Optimal Range of Coupling Coefficient to Suppress Decline in WPTS Efficiency Due to Increased Resistance With Temperature Rise

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