Originating from Nikola Tesla proposed WPT in the late 19th century, with his 1899 "Tesla Tower" experiment being one of the first to attempt to transmit electrical energy through the air using resonance. A Wireless Power Transfer (WPT) system for EV charging is a technology that transfers electrical energy from a power grid to an electric vehicle (EV) battery without physical cables or plugs. It uses magnetic fields—specifically magnetic resonance coupling —between a ground-based transmitter pad and a vehicle-based receiver pad to charge safely and conveniently. RF inverter converts the frequency of the power. Typically, RF inverter also converts the voltage of the power. Considering that the power is P = VI and the impedance is Z = V/I, the RF inverter also converts the impedance of the power. The rectifier in Rx side also changes the frequency of the power. Depicts the base  components of a WPT system for EV charging. It consists of two prime sub-systems, one of which is existing underneath the road surface and the second is found into the vehicle underbody. The electrification of transportation is underway and wireless charging is poised to play a significant role. Wireless charging systems provide a convenient hands-off method to charge electric vehicles at the same speed and efficiency as standard conductive AC chargers. More recently, the SAE J2954 standard has established guidelines, allowing for, in some cases, charging efficiencies over 93%.

Keywords:  Wireless Power Transfer system (WPT), Solar Power Satellite. Electrification, Voltage and Electric Vehicle.