Optimization of Magnetic Core Structure for Wireless Charging Coupler

Zeng, Hao; Liu, Zhizhen; Hou, Yanjin; Tong, Hei; Zhou, Bo

doi:10.1109/tmag.2017.2657544

Cited by 46 publications

(9 citation statements)

References 6 publications

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“…Coil Structure Efficiency Improvement (If Optimized) [7] UDD -−50% in cost [8] DD 85% - [12] DD -25% in coupling coefficient [13] Rectangular 95.5% - [15] DD 80% 6% in efficiency…”

Section: Referencesmentioning

confidence: 99%

“…Although a large number of magnetic core calculation methods have been proposed and can be selected in different situations, many of the optimal design methods of the magnetic core structure are still only in the continuous simulation and experimental process, and there is no corresponding response to a certain shape of the coil [15]. Reference [15] proposed a magnetic core optimization method for DD-shaped coupling coils. Through the cooperation of FEA simulation software and MATLAB, the magnetic field distribution at different positions is analyzed, and the thickness of the magnetic core is optimized to make the magnetic field distribution more uniform.…”

Section: Referencesmentioning

confidence: 99%

“…Since there are two coils connected in series on the primary side but with opposite winding directions, there will be two different excitation sources. Through the previously adopted magnetic circuit analysis method, the relationship between the coupling coefficient of the DD coil and various design parameters can be obtained, and the expression can be found in Equation (15).…”

Section: Coupling Coefficientmentioning

confidence: 99%

“…Ref [8] also proposed the use of DD and Q coils for electric vehicles that has been seen to be a recent trend for EV wireless coils. Combined with the finite element analysis, the aspect ratio of the coil and the ferrite can also be optimized to make the coupling of the system and the placement of the ferrite more effective [9][10][11][12][13][14][15][16]. In order to increase the robustness of the air core system during operation, it is often necessary to add additional circuits and coils to control the stability of the system [10].…”

Section: Introductionmentioning

confidence: 99%

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Optimization of Ferrites Structure by Using a New Core-Less Design Algorithm for Electric Vehicle Wireless Power Transfer

et al. 2021

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In order to improve the customers’ continuous usage of electrical vehicles (EVs) and reduce the weight of the energy storage devices, wireless charging technology has been widely studied, updated, and commercialized in recent decades, regarding to its distinct superiority of great convenience and low risk. A higher coupling coefficient is the key factor that impacts the transmission efficiency, thus in most medium-power (hundreds of watts) to high-power (several kilowatts) wireless charging systems, ferrites are used to guide the magnetic flux and intensify the magnetic density. However, the weight of the ferrite itself puts an extra burden on the system, and the core loss during operation also reduces the total efficiency and output power. This paper proposes an optimized design algorithm based on a core-less method for the magnetic core, where the core loss and the coupling coefficient are consequently balanced, and the overall weight and efficiency of the system can be optimized. The iteration procedure is applied on the basis of removed ferrite length and thickness in the algorithm. In the simulation, a square coupler with a total volume of 300 mm × 150 mm, a circular coupler of 150 mm × 150 mm and a Double-D (DD) coupler of 300 mm × 150 mm are used to verify the advantages of the proposed method. The optimized ferrite structures are specific for each coupler shape, and the improvement is proved to be universal in current scale by means of 3-D finite element analysis.

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“…Coil Structure Efficiency Improvement (If Optimized) [7] UDD -−50% in cost [8] DD 85% - [12] DD -25% in coupling coefficient [13] Rectangular 95.5% - [15] DD 80% 6% in efficiency…”

Section: Referencesmentioning

confidence: 99%

Section: Referencesmentioning

confidence: 99%

Section: Coupling Coefficientmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optimization of Ferrites Structure by Using a New Core-Less Design Algorithm for Electric Vehicle Wireless Power Transfer

et al. 2021

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“…Different power levels of WCS have been researched to analyze the distribution characteristics of EMF. Some kinds of method were proposed to reduce magnetic field exposure, including adding a shield plate, optimizing coils shape and ferrite arrangement, matching impedance and adding a reverse magnetic field [14][15][16][17]. The fast switching of these power semiconductor devices such as MOSFET used in invertor of WCS is controlled by PWM, as result in generation of conducted EMI and low power quality.…”

Section: Introductionmentioning

confidence: 99%

Mitigation Conducted Emission Strategy Based on Transfer Function from a DC-Fed Wireless Charging System for Electric Vehicles

et al. 2018

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The large dv/dt and di/dt outputs of power devices in wireless charging system (WCS) in electric vehicles (EVs) always introduce conducted electromagnetic interference (EMI) emissions. This paper proposes a mitigation conducted emission strategy based on transfer function from a direct current fed (DC-fed) WCS for EVs. A complete test for the DC-fed WCS is set up to measure the conducted emission of DC power cables in a frequency range of 150 kHz-108 MHz. An equivalent circuit with high-frequency parasitic parameters for WCS for EV is built based on measurement results to obtain the characteristics of conducted emission from WCS. The transfer functions of differential mode (DM) interference and common mode (CM) interference were established. A judgment method of using transfer functions to determine the dominated interference mode responsible for EMI is proposed. From the comparison of simulation results between CM or DM and CM+DM interference, it can be seen that the CM interference is the dominated interference mode which causes the conducted EMI in WCS in EVs. A strategy of giving priority to the dominated interference mode is proposed for designing the CM interference filter. Finally, the conducted voltage experiment is performed to verify the mitigation conducted emission strategy. The conducted voltage of simulation and experiment is decreased respectively by 21.17 and 21.4 dBµV at resonance frequency 30 MHz. The conduced voltage at frequency range of 150 kHz-108 MHz can be mitigated to below the limit level-3 of CISPR25 standard (GB/T 18655-2010) by adding the CM interference filters.

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Magnetic Field Distribution of Resonance Coupling Coils of 7.7 kW Wireless Charging System

Zhong

Zhai

et al. 2019

Lecture Notes in Electrical Engineering

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Optimization of Magnetic Core Structure for Wireless Charging Coupler

Cited by 46 publications

References 6 publications

Optimization of Ferrites Structure by Using a New Core-Less Design Algorithm for Electric Vehicle Wireless Power Transfer

Optimization of Ferrites Structure by Using a New Core-Less Design Algorithm for Electric Vehicle Wireless Power Transfer

Mitigation Conducted Emission Strategy Based on Transfer Function from a DC-Fed Wireless Charging System for Electric Vehicles

Magnetic Field Distribution of Resonance Coupling Coils of 7.7 kW Wireless Charging System

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