Design and Application of Underground Wireless Power Transfer Charging System in Electric Cars

In the recent years there is a significant development in the field of wireless power transfer. In the future, gasoline and oil powered engines are going to become obsolete. And hence as a result these oil powered cars and bikes are going to be replaced by EV also known as electric vehicles. Electric Vehicles (EV) are very much environmental friendly and they act as a perfect alternative source of energy .There is a gradual increase in the usage of electric cars. But there are also drawbacks and require a technological breakthrough to overcome them. One of the major drawbacks is the battery limitations and the time required to charge it to reach its maximum potential. In this project inductive coupling and magneto dynamic coupling methods are used to charge the batteries of EV. Wireless power transmission (WPT) or Electromagnetic power transfer (EPT) is the transfer of electrical power from the power source to a receiver without any physical connections by the use of varying electromagnetic field. WPT circuitry is placed inside the vehicle which gets activated when the vehicle reaches the charging spot on the road. The primary circuit is supplied from the charging station and the coils are placed under the surface of the road i.e., underground. Electromagnetic flux is radiated out of the primary coil and gets induced with secondary coil present in the EV. The induced voltage from secondary coil is then regulated, rectified and used to charge the EV battery. In this report different wireless power transmissions are compared and how Efficient wireless power transmission is done and control over electromagnetic induction and effective charging of battery will be achieved.