Wireless Charging Experience That Made for You

By introducing a wireless charging system many benefits can be achieved including smart user interaction, reachability, availability and on a top of that an autonomous charging experience where the wireless charger and the vehicle are communicating to Park – Charge – Go.

To simplify the wireless power transmission, the power is being transfer between the transmitter pad which is installed on the parking ground and a receiver pad which is installed on the vehicle side. When the AC supply is applied to the transmitter pad, it creates AC electromagnetic field that interact with the receiver pad resulting in induced AC voltage at the receiver pad terminals. This AC output is then rectified and filtered to charge the EV’s energy storage system. This is called an induction power transfer. The main drop point of the induction power transfer is that the power transfer efficiency will drop down as the distance between the transmitter and receiver pads increase. To increase the power transfer efficiency, we at MAGNEKS are introducing the resonance inductive power transfer.

RESONANCE INDUCTIVE WIRELESS CHARGING SYSTEM

Resonant is a physical phenomenon in which two objects are vibrating at the same natural frequency resulting in adding efficient energy to an oscillating system. In order to increase the power transfer efficiency of the wireless charging system, the frequencies of the electromagnetic fields of the transmitter and receiver pads should operate at resonance. Resonant coupling occurs when the natural frequencies of the transmitter and receiver pads are approximately the same which allows to transmit energy at high and efficient rate. By operating at resonance, the power can be transferred to wide distance (airgap between transmitter and receiver pad) with high power transfer efficiency. Max power transfer over the airgap happens when the transmitter and receiver pads are tuned. To get good resonant frequencies, additional impedance matching networks (IMN) in the series and parallel combinations are added to the transmitter and receiver pads. This additional impedance matching network (IMN) also reduces the system power loses to minimum.