A Normalization Method of Delimiting the Electromagnetic Hazard Region of a Wireless Power Transfer System

Zhang, Kehan; Du, Lifei; Zhu, Zhengbiao; Song, Baowei; Xu, Demin

doi:10.1109/temc.2017.2752300

Cited by 22 publications

(11 citation statements)

References 14 publications

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“…The second step is the parameter design of the filter angular frequency w 0 . For w 0 , we can know from Formulae (12) and (14) and Fig. 6b that the smaller the w 0 value, the worse the filtering effect, but the higher the efficiency, and vice versa.…”

Section: Design Of the Filter Parametersmentioning

confidence: 95%

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Design of wireless power transfer system with inputfilter

Zhao

2020

IET Power Electronics

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For power electronic systems, adding filters to eliminate harmonic interference is a general and effective method, but the position and parameters of filters in wireless power transmission (WPT) system will greatly affect the system characteristics of WPT. The main reason for the harmonic interference in WPT is that the harmonics in the output square wave are loaded on the resonant coil of the transmitter, so in this study, a method of harmonic elimination by adding a second-order LCR filter to the resonant part (LCR-WPT) is studied. However, the WPT resonant part is precisely matched and designed; if a filter is added at the resonant part, it inevitably affects the resonance state, system output power and efficiency of the WPT. To ensure that the LCR-WPT has good system characteristics, this study analyses the mathematical model of the LCR-WPT and deduces a design method for the filter and an efficiency optimisation formula. This study also introduces LCR-WPT applications in two different control schemes. The experimental results show that the harmonic interference of the system is significantly attenuated after the filter is added; additionally, the efficiency of the system decreases by <10%, and the system still maintains sufficient output power.

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Section: Design Of the Filter Parametersmentioning

confidence: 95%

“…In some standards, the harmonic interference of traditional WPT will exceed the limit by >20 dB. Attenuating the electromagnetic interference of WPT is a challenge [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Design of wireless power transfer system with inputfilter

Zhao

2020

IET Power Electronics

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“…For a given WPT class, the magnetic field is maximum for small size vehicles with maximum ground clearance and maximum offset. The goal of this study was to numerically predict the magnetic field in the environment [11][12][13][14][15][16][17][18][19][20][21][22][23][24]. The numerical simulations were carried out by a hybrid technique based on the solution of an electromagnetic (EM) field/circuit coupled problem.…”

Section: Wpt Equivalent Circuit and Compensation Networkmentioning

confidence: 99%

Magnetic Field during Wireless Charging in an Electric Vehicle According to Standard SAE J2954

et al. 2019

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The Society of Automotive Engineers (SAE) Recommended Practice (RP) J2954 (November 2017) was recently published to standardize the wireless power transfer (WPT) technology to recharge the battery of an electric vehicle (EV). The SAE J2954 RP establishes criteria for interoperability, electromagnetic compatibility (EMC), electromagnetic field (EMF) safety, etc. The aim of this study was to predict the magnetic field behavior inside and outside an EV during wireless charging using the design criteria of SAE RP J2954. Analyzing the worst case configurations of WPT coils and EV bodyshell by a sophisticated software tool based on the finite element method (FEM) that takes into account the field reflection and refraction of the metal EV bodyshell, it is possible to numerically assess the magnetic field levels in the environment. The investigation was performed considering the worst case configuration—a small city car with a Class 2 WPT system of 7.7 kVA with WPT coils with maximum admissible ground clearance and offset. The results showed that the reference level (RL) of the International Commission on Non-Ionizing Radiation Protection (ICNIRP) guidelines in terms of magnetic flux density was exceeded under and beside the EV. To mitigate the magnetic field, the currents flowing through the WPT coils were varied using the inductor-capacitor-capacitor (LCC) compensation instead of the traditional series-series (SS) compensation. The corresponding calculated field was compliant with the 2010 ICNIRP RL and presented a limited exceedance of the 1998 ICNIRP RL. Finally, the influence of the body width on the magnetic field behavior adopting maximum offset was investigated, demonstrating that the magnetic field emission in the environment increased as the ground clearance increased and as the body width decreased.

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“…There is an extremely restricted receiver size and weight of the receiver side on the AUV, so the receiver should be as compact as possible. The research focus covers the power electronics converters, coil optimization [9], compensation topologies [10][11][12][13][14][15][16][17][18][19][20], foreign object detection [21] and safety issues [22]. Among these fields, the compensation topologies, or the matching networks, are crucial to increase the overall efficiency and minimize the VA rating of the power electronics converters by using additional inductors and capacitors to adjust the reactive power.…”

Section: Introductionmentioning

confidence: 99%

An LCC-P Compensated Wireless Power Transfer System with a Constant Current Output and Reduced Receiver Size

Zhang

Song

et al. 2019

Energies

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Wireless Power Transfer (WPT) for autonomous underwater vehicles (AUVs) has been a research focus in recent years. This paper studies the inductor-capacitor-capacitor and parallel (LCC-P) compensation topology to achieve a compact receiver for AUVs. Unlike the series-series (SS) compensation topology, the LCC-P topology retains the advantages of the double-sided LCC topology and has a more compact receiver than the double-sided LCC topology with fewer elements used on the receiver side. The analytical model of such a WPT system is established to analyze the output power and transfer efficiency. The LCC-P topology has a higher efficiency compared to the SS topology due to the smaller conduction loss of the inverter. Moreover, a method of eliminating the DC filter inductor L0 is proposed to further decrease the size and weight of the receiver. The amplitude of the withstanding voltage on the receiver compensation capacitor without L0 is approximately decreased by 40% compared to that with L0. Both cases of with and without L0 have a constant current output and the peak efficiency without L0 is about 94%, which is 1% lower than that with L0. A prototype was built and the experimental results verified the theoretical analysis.

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A Normalization Method of Delimiting the Electromagnetic Hazard Region of a Wireless Power Transfer System

Cited by 22 publications

References 14 publications

Design of wireless power transfer system with inputfilter

Design of wireless power transfer system with inputfilter

Magnetic Field during Wireless Charging in an Electric Vehicle According to Standard SAE J2954

An LCC-P Compensated Wireless Power Transfer System with a Constant Current Output and Reduced Receiver Size

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