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The transmission cable and power conversion device need to be buried underground for dynamic wireless charging of an expressway, so cable insulation deterioration caused by aging and corrosion may occur. This paper presents an on-line insulation monitoring method based on BP neural network for dynamic wireless charging network. The sampling signal expression of the injection signal is derived, and the feasibility of this method is verified by experiments, which effectively overcomes the problem of large calculation error of insulation resistance when the cable capacitance to ground is large. The experimental results indicate that the error of the proposed method is less than 9%, which can meet the needs of insulation monitoring.
Feng Wen; Wenjie Pei; Qiang Li; Zhoujian Chu; Wenhan Zhao; Shuqi Wu; Xiang Zhang; Chen Han. Insulation Monitoring of Dynamic Wireless Charging Network Based on BP Neural Network. World Electric Vehicle Journal 2021, 12, 129 .
AMA StyleFeng Wen, Wenjie Pei, Qiang Li, Zhoujian Chu, Wenhan Zhao, Shuqi Wu, Xiang Zhang, Chen Han. Insulation Monitoring of Dynamic Wireless Charging Network Based on BP Neural Network. World Electric Vehicle Journal. 2021; 12 (3):129.
Chicago/Turabian StyleFeng Wen; Wenjie Pei; Qiang Li; Zhoujian Chu; Wenhan Zhao; Shuqi Wu; Xiang Zhang; Chen Han. 2021. "Insulation Monitoring of Dynamic Wireless Charging Network Based on BP Neural Network." World Electric Vehicle Journal 12, no. 3: 129.
With the rapid development of wireless power transfer (WPT) technology, the traditional single-transceiver WPT system has become more and more advanced; however, it is still difficult to meet its extensive application requirements. Aiming at the wireless charging of mobile phones in public places, electric vehicles (EVs) in multistorey garages, and electronic shelf labels (ESLs) in supermarket merchandise shelves, a multireceiver wireless power supply system with power equalization is proposed. The condition of power equalization is derived according to the equivalent circuit of the proposed WPT system, and the received power can be equally maintained by adjusting the transceiver loop resistance when the total load number or transmission distance changes. A simulation model is established to evaluate the electromagnetic environment of the proposed WPT system, and the results comply with the electromagnetic safety of the ICNIRP-2018 guidelines. Finally, the experimental results show that the power differential rate that meets the power equalization condition is 13 to 17% lower than that of the unsatisfied rate, which verifies the effectiveness of the proposed system in terms of power equalization.
Bin Shi; Feng Wen; Xiaohu Chu. A Multireceiver Wireless Power Supply System with Power Equalization in Stereoscopic Space. Electronics 2021, 10, 713 .
AMA StyleBin Shi, Feng Wen, Xiaohu Chu. A Multireceiver Wireless Power Supply System with Power Equalization in Stereoscopic Space. Electronics. 2021; 10 (6):713.
Chicago/Turabian StyleBin Shi; Feng Wen; Xiaohu Chu. 2021. "A Multireceiver Wireless Power Supply System with Power Equalization in Stereoscopic Space." Electronics 10, no. 6: 713.
In order to improve transmission performance of Wireless Power Transfer (WPT) system, this paper proposes the concept of optimal receiver radius. The planar square transmitter coil WPT system is studied to explore the variation rule of optimal receiver radius with the parameters of WPT system. The key parameters that affect optimal radius are transmitter coil turns, turn spacing, side length and transmission distance. On this basis, by introducing BP neural network to learn the variation rule, the accurate prediction of optimal receiver radius under different parameters is realized. Finally, the finite element simulation proves the existence of optimal receiver radius and the accuracy of the prediction value.
Feng Wen; Fansheng Jing; Wenhan Zhao; Chen Han; Zhoujian Chu; Qiang Li; Xiaohu Chu; Xueqiong Zhu. Research on optimal receiver radius of wireless power transfer system based on BP neural network. Energy Reports 2020, 6, 1450 -1455.
AMA StyleFeng Wen, Fansheng Jing, Wenhan Zhao, Chen Han, Zhoujian Chu, Qiang Li, Xiaohu Chu, Xueqiong Zhu. Research on optimal receiver radius of wireless power transfer system based on BP neural network. Energy Reports. 2020; 6 ():1450-1455.
Chicago/Turabian StyleFeng Wen; Fansheng Jing; Wenhan Zhao; Chen Han; Zhoujian Chu; Qiang Li; Xiaohu Chu; Xueqiong Zhu. 2020. "Research on optimal receiver radius of wireless power transfer system based on BP neural network." Energy Reports 6, no. : 1450-1455.
This study aims to solve a problem that exists with impedance matching networks in terms of extra cost and power loss of electronic components in a four-coil wireless power transfer (WPT) system using class E power amplifier as power supply, which is not conducive to the improvement of system efficiency and output power. A design method of sharing the resonant inductor in class E power amplifier and the excitation coil in the four-coil WPT system is proposed. This method comprehensively considers the output power and transfer efficiency of the system, the number of coil turns, coil size and many other factors. Compared with the traditional four-coil system using a class E power amplifier as a power supply, the proposed method simplified the system structure by leaving out a resonant inductor and load matching circuit, which can reduce the power loss of system and improve efficiency. Moreover, the precisely tuning of resonant inductor was not necessary, which improved the stability of the system. The correctness and feasibility of the parameter design method were verified by experiments. The experimental results showed that the output power of the system was increased by 18.7%, the efficiency was increased by 11%, and the transmission distance was up to 0.7 m, which is suitable for wireless power supply of electronics and sensors.
Feng Wen; Xingchen Cheng; Qiang Li; Jianqiao Ye. Wireless Charging System Using Resonant Inductor in Class E Power Amplifier for Electronics and Sensors. Sensors 2020, 20, 2801 .
AMA StyleFeng Wen, Xingchen Cheng, Qiang Li, Jianqiao Ye. Wireless Charging System Using Resonant Inductor in Class E Power Amplifier for Electronics and Sensors. Sensors. 2020; 20 (10):2801.
Chicago/Turabian StyleFeng Wen; Xingchen Cheng; Qiang Li; Jianqiao Ye. 2020. "Wireless Charging System Using Resonant Inductor in Class E Power Amplifier for Electronics and Sensors." Sensors 20, no. 10: 2801.
For wireless charging of electric vehicles (EVs), increasing the output power level is particularly important. In this paper, the purpose of improving the output power while maintaining optimal transmission efficiency is achieved by optimizing the parameters of the compensation topology under the premise that the coupled coils of the system does not need to be redesigned. The series-series (SS) and hybrid-series-parallel (LCC, composed by an inductor and two capacitors) compensation topology are studied. The influence factors of load resistance to achieve optimal efficiency, the influence of LCC compensation parameters on the power output level, and the influence of parameter changes on system safety are analyzed. Theorical results show that by rationally designing the LCC compensation parameters, larger output power and optimal transfer efficiency can be achieved under different load resistance by adjusting the inductances of the primary and secondary compensation circuits. The output power of the optimized system with adjusted LCC compensation topology is increased by 64.2% with 89.8% transfer efficiency under 50 ohms load in experiments. The correctness and feasibility of this parameter design method are verified by both theorical and experimental results.
Feng Wen; Xiaohu Chu; Qiang Li; Wei Gu. Compensation Parameters Optimization of Wireless Power Transfer for Electric Vehicles. Electronics 2020, 9, 789 .
AMA StyleFeng Wen, Xiaohu Chu, Qiang Li, Wei Gu. Compensation Parameters Optimization of Wireless Power Transfer for Electric Vehicles. Electronics. 2020; 9 (5):789.
Chicago/Turabian StyleFeng Wen; Xiaohu Chu; Qiang Li; Wei Gu. 2020. "Compensation Parameters Optimization of Wireless Power Transfer for Electric Vehicles." Electronics 9, no. 5: 789.
With the rapid development and extensive application requirements of wireless power transfer (WPT) technology, the common symmetrical WPT system is growing more mature, but it may still struggle to meet the vast demands. When the WPT system has a long transmission distance and the dimensions of transmitter and receiver coil are asymmetric, the current in the transmitter coil of traditional two-coil symmetrical structure may be excessive. The addition of a relay coil between the transmitter and the receiver coil can effectively reduce the current of transmitter coil, thereby improving system efficiency and reducing electromagnetic field (EMF) leakage. In this article, the parameters of relay coil are optimized by theoretical calculation and multiobjective genetic algorithm. The results show that the optimized three-coil system can reduce the current of transmitter coil by 73.1%, improve the efficiency by 10.7%, and suppress the EMF leakage by 12 dB simultaneously. Finally, the effectiveness of the proposed system is verified by experiments.
Feng Wen; Xiaohu Chu; Qiang Li; Rui Li; Li Liu; Fansheng Jing. Optimization on Three-Coil Long-Range and Dimension-Asymmetric Wireless Power Transfer System. IEEE Transactions on Electromagnetic Compatibility 2020, 62, 1859 -1868.
AMA StyleFeng Wen, Xiaohu Chu, Qiang Li, Rui Li, Li Liu, Fansheng Jing. Optimization on Three-Coil Long-Range and Dimension-Asymmetric Wireless Power Transfer System. IEEE Transactions on Electromagnetic Compatibility. 2020; 62 (5):1859-1868.
Chicago/Turabian StyleFeng Wen; Xiaohu Chu; Qiang Li; Rui Li; Li Liu; Fansheng Jing. 2020. "Optimization on Three-Coil Long-Range and Dimension-Asymmetric Wireless Power Transfer System." IEEE Transactions on Electromagnetic Compatibility 62, no. 5: 1859-1868.
This paper investigates the tapered and curved coil used in wireless power transfer (WPT) system for the purpose of improving flexibility in specific applications. The WPT transmission performance is always declined by coil bending. To solve this problem, the models of the coils are built and their magnetic flux are analyzed. The phenomenon of curvature angle splitting is researched, the mechanism is revealed and the method is proposed to avoid the splitting. Formulas are derived to determine whether the system is working in curvature angle splitting state. By optimizing the coil parameters to make the system work in critical splitting state, the maximum output power and excellent stability under different angles are achieved. Experimental results show that when the optimally designed receiver coil is bent in the range of 50° to 130°, the maximum current change rate is only 4.3%. The study in this article will further promote the application of wireless power transfer technology in a wider range of fields.
Feng Wen; Fansheng Jing; Qiang Li; Rui Li; Li Liu; Xiaohu Chu. Curvature Angle Splitting Suppression and Optimization on Nonplanar Coils Used in Wireless Charging System. IEEE Transactions on Power Electronics 2020, 35, 9070 -9081.
AMA StyleFeng Wen, Fansheng Jing, Qiang Li, Rui Li, Li Liu, Xiaohu Chu. Curvature Angle Splitting Suppression and Optimization on Nonplanar Coils Used in Wireless Charging System. IEEE Transactions on Power Electronics. 2020; 35 (9):9070-9081.
Chicago/Turabian StyleFeng Wen; Fansheng Jing; Qiang Li; Rui Li; Li Liu; Xiaohu Chu. 2020. "Curvature Angle Splitting Suppression and Optimization on Nonplanar Coils Used in Wireless Charging System." IEEE Transactions on Power Electronics 35, no. 9: 9070-9081.
Hongjie Song; Wei Zhang; Lin Liu; Zhengwei Yang; Anbo Ming; Feng Wen; Xueliang Huang; Lixing Chen. Simulation of a heat pipe receiver with high-temperature latent heat thermal energy storage during the charging process. Automotive, Mechanical and Electrical Engineering 2017, 313 -320.
AMA StyleHongjie Song, Wei Zhang, Lin Liu, Zhengwei Yang, Anbo Ming, Feng Wen, Xueliang Huang, Lixing Chen. Simulation of a heat pipe receiver with high-temperature latent heat thermal energy storage during the charging process. Automotive, Mechanical and Electrical Engineering. 2017; ():313-320.
Chicago/Turabian StyleHongjie Song; Wei Zhang; Lin Liu; Zhengwei Yang; Anbo Ming; Feng Wen; Xueliang Huang; Lixing Chen. 2017. "Simulation of a heat pipe receiver with high-temperature latent heat thermal energy storage during the charging process." Automotive, Mechanical and Electrical Engineering , no. : 313-320.
Dapeng Yin; Lin Liu; Zhong Chen; Tao Zhou; Zhiqiang Shi; Chen Lixing; Xueliang Huang; Feng Wen. Load forecasting of expressway EV charging based on travel characteristics. Automotive, Mechanical and Electrical Engineering 2017, 263 -268.
AMA StyleDapeng Yin, Lin Liu, Zhong Chen, Tao Zhou, Zhiqiang Shi, Chen Lixing, Xueliang Huang, Feng Wen. Load forecasting of expressway EV charging based on travel characteristics. Automotive, Mechanical and Electrical Engineering. 2017; ():263-268.
Chicago/Turabian StyleDapeng Yin; Lin Liu; Zhong Chen; Tao Zhou; Zhiqiang Shi; Chen Lixing; Xueliang Huang; Feng Wen. 2017. "Load forecasting of expressway EV charging based on travel characteristics." Automotive, Mechanical and Electrical Engineering , no. : 263-268.
In this paper, we propose a new type of brushless excitation mechanism. Powering the motor exciting winding by wireless power transmission (WPT) based on magnetically-coupled resonance can be an efficient way to avoid mechanical connection of the rotor and the external terminal, and achieve brushless excitation conveniently and economically in a novel method. The constituent parts of this excitation mechanism and the way they work together are introduced. We also design different types of resonators for different excitation demands. The electromagnetic environment of this mechanism is studied and some confirmatory experiments are carried out, the results reveal the effectiveness.
Feng Wen; Xueliang Huang; Linlin Tan. A new type of power supply for excitation mechanism of motor in electrical appliance. 2017 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW) 2017, 139 -142.
AMA StyleFeng Wen, Xueliang Huang, Linlin Tan. A new type of power supply for excitation mechanism of motor in electrical appliance. 2017 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW). 2017; ():139-142.
Chicago/Turabian StyleFeng Wen; Xueliang Huang; Linlin Tan. 2017. "A new type of power supply for excitation mechanism of motor in electrical appliance." 2017 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW) , no. : 139-142.
The scenario of multiple wireless power transfer (WPT) systems working closely, synchronously or asynchronously with phase difference often occurs in power supply for household appliances and electric vehicles in parking lots. Magnetic field leakage from the WPT systems is also varied due to unpredictable asynchronous working conditions. In this study, the magnetic field leakage from parallel WPT systems working with phase difference is predicted, and the induced electric field and specific absorption rate (SAR) in a human body standing in the vicinity are also evaluated. Computational results are compared with the restrictions prescribed in the regulations established to limit human exposure to time-varying electromagnetic fields (EMFs). The results show that the middle region between the two WPT coils is safer for the two WPT systems working in-phase, and the peripheral regions are safer around the WPT systems working anti-phase. Thin metallic plates larger than the WPT coils can shield the magnetic field leakage well, while smaller ones may worsen the situation. The orientation of the human body will influence the maximum magnitude of induced electric field and its distribution within the human body. The induced electric field centralizes in the trunk, groin, and genitals with only one exception: when the human body is standing right at the middle of the two WPT coils working in-phase, the induced electric field focuses on lower limbs. The SAR value in the lungs always seems to be greater than in other organs, while the value in the liver is minimal. Human exposure to EMFs meets the guidelines of the International Committee on Non-Ionizing Radiation Protection (ICNIRP), specifically reference levels with respect to magnetic field and basic restrictions on induced electric fields and SAR, as the charging power is lower than 3.1 kW and 55.5 kW, respectively. These results are positive with respect to the safe applications of parallel WPT systems working simultaneously.
Feng Wen; Xueliang Huang. Human Exposure to Electromagnetic Fields from Parallel Wireless Power Transfer Systems. International Journal of Environmental Research and Public Health 2017, 14, 157 .
AMA StyleFeng Wen, Xueliang Huang. Human Exposure to Electromagnetic Fields from Parallel Wireless Power Transfer Systems. International Journal of Environmental Research and Public Health. 2017; 14 (2):157.
Chicago/Turabian StyleFeng Wen; Xueliang Huang. 2017. "Human Exposure to Electromagnetic Fields from Parallel Wireless Power Transfer Systems." International Journal of Environmental Research and Public Health 14, no. 2: 157.
To meet the regulations established to limit human exposure to time-varying electromagnetic fields (EMFs) such as the International Committee on Non-Ionizing Radiation Protection (ICNIRP) guidelines, thin metallic sheets are often used to shield magnetic field leakage in high power applications of wireless power transfer (WPT) systems based on magnetic field coupling. However, the metals in the vicinity of the WPT coils cause the decrease of self and mutual inductances and increase of effective series resistance; as such, the electric performance including transmission power and the efficiency of the system is affected. With the research objective of further investigating excellent shielding effectiveness associated with system performance, the utilization of the optimal magnetic field shielding method by metallic sheets in magnetic field coupling WPT is carried out in this paper. The circuit and 3D Finite Element Analysis (FEA) models are combined to predict the magnetic field distribution and electrical performance. Simulation and experiment results show that the method is very effective by obtaining the largest possible coupling coefficient of the WPT coils within the allowable range and then reducing the value nearest to and no smaller than the critical coupling coefficient via geometric unbroken metallic sheets. The optimal magnetic field shielding method which considers the system efficiency, transmission power, transmission distance, and system size is also achieved using the analytic hierarchy process (AHP). The results can benefit WPT by helping to achieve efficient energy transfer and safe use in metal shielded equipment.
Feng Wen; Xueliang Huang. Optimal Magnetic Field Shielding Method by Metallic Sheets in Wireless Power Transfer System. Energies 2016, 9, 733 .
AMA StyleFeng Wen, Xueliang Huang. Optimal Magnetic Field Shielding Method by Metallic Sheets in Wireless Power Transfer System. Energies. 2016; 9 (9):733.
Chicago/Turabian StyleFeng Wen; Xueliang Huang. 2016. "Optimal Magnetic Field Shielding Method by Metallic Sheets in Wireless Power Transfer System." Energies 9, no. 9: 733.
Wireless power transfer via strongly coupled magnetic resonance is an effective and convenient technology to transfer energy. The output power splitting in close distances and monotonic decay of the output power in longer distances exist when it comes to single-transmitter case. For the sake of more stable output power in a broader space, the authors proposed a novel wireless power system with multiple transmitters. Further analysis of features of both single-transmitter and multiple-transmitter systems was presented with the adoption of MATLAB and High-Frequency Structure Simulator. The authors demonstrated the superiority of the multiple-transmitter system and then investigated the impact of transmitter spacing on output power. To stabilise the output power as much as possible, an optimisation strategy is designed by setting transmitter spacing as decision variables and the minimum power variance as the target. The measurement shows that for a load demand of 5 W, a stable area with a standard deviation of 0.32 can be achieved when transmitters are placed 0.33 m apart. Both theoretical and simulation results make it possible to power the movable devices more stably.
Linlin Tan; Jinpeng Guo; Xueliang Huang; Feng Wen. Output power stabilisation of wireless power transfer system with multiple transmitters. IET Power Electronics 2016, 9, 1374 -1380.
AMA StyleLinlin Tan, Jinpeng Guo, Xueliang Huang, Feng Wen. Output power stabilisation of wireless power transfer system with multiple transmitters. IET Power Electronics. 2016; 9 (7):1374-1380.
Chicago/Turabian StyleLinlin Tan; Jinpeng Guo; Xueliang Huang; Feng Wen. 2016. "Output power stabilisation of wireless power transfer system with multiple transmitters." IET Power Electronics 9, no. 7: 1374-1380.
On-line electric vehicles (OLEVs) powered along their way by wireless power transfer (WPT) are an attractive option since they are convenient, safe, lightweight, and have unlimited cruising range by increasing the length of the power supply rails . There exists the possibility to run the rails and high voltage AC power lines parallel to each other in a relatively narrow strip of land . Due to this sharing of the right-of-way, power lines may lead to serious adverse effects . In this paper, a WPT system for OLEV is introduced and exposed under a 500kV single circuit horizontal transmission line . We discuss the possible effects of the phase conductors, low frequency magnetic field, induced voltage, and electromagnetic field exposure on the WPT system for OLEV charging by the transmission lines .
F. Wen; X. Huang. Transmission lines effects on charging system for on-line electric vehicle sharing the same corridor. 2015 IEEE Magnetics Conference (INTERMAG) 2015, 1 -1.
AMA StyleF. Wen, X. Huang. Transmission lines effects on charging system for on-line electric vehicle sharing the same corridor. 2015 IEEE Magnetics Conference (INTERMAG). 2015; ():1-1.
Chicago/Turabian StyleF. Wen; X. Huang. 2015. "Transmission lines effects on charging system for on-line electric vehicle sharing the same corridor." 2015 IEEE Magnetics Conference (INTERMAG) , no. : 1-1.