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Optimization of Dynamic Wireless Power Transfer for Maximum Power Transmission to Electric Vehicles

Sarmast Ghahfarokhi, Shahriar | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52949 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Tahami, Farzad
  7. Abstract:
  8. Nowadays, due to environmental problems, electric cars are becoming more and more popular. The main drawback of these cars is due to the large volume, weight, and price of the battery and its long charging time. Charging the battery at short intervals or even in moving, can help to use a smaller battery and reduce battery problems. Therefore, the dynamic wireless power transmission technology that provides power without having to stop the car to recharge its batteries can revolutionize the electric car industry. The ever-expanding advance of power electronics and wireless power transmission technologies has made it possible to transfer power to moving electric cars. Barriers to this industry include permanent load changes, misalignment, parasitic elements, poor coil coupling, and so on.Since one of the most important obstacles facing this industry is the misalignment in the power transmission structure, studies in this thesis have been conducted to improve the shape of the coils. The results of these studies provide a formulation to calculate the mutual inductance of elliptical and super- elliptical sections. Also, by defining the normalized integral for different shapes, the optimal coil shape is chosen for power transfer. Due to the permanent change of mutual inductance, the switching frequency floating method and its estimation using the primary side’s voltage and current without the need for secondary side’s voltage and current are presented which will increase the efficiency and output power. In this thesis, an improved topology was investigated to address the problems of the Class φ2 converter in dynamic wireless power transmission, and it is possible to change the switching frequency of the Class φ2 converter, one of the most important limitations of this converter. The results show the increase of the transmitted power, elimination of undesired voltage harmonics and optimization of mutual inductance for maximum power transfer
  9. Keywords:
  10. Dynamic Wireless Power Transfer ; Band-Rejection Filter ; Decrease the Peak Amplitude of the Voltage ; Coil’s Shape Optimization ; Float Switching Frequency

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