The batteries of some Audi e-tron models can be charged inductively by Audi Wireless Charging (AWC) in the near future. This new, convenient charging technology involves the use of a floor pad that induces an alternating current in the secondary coil mounted in the car under the front axle. Once the driver has positioned the car over the floor pad – with visual assistance on the MMI provided by the parking system – the charging station’s charging coil automatically extends upward and starts the charging process at 3.6 kW.
The alternating magnetic field induces an alternating voltage in the secondary coil mounted in vehicle underbody across an air gap. The integrated electronics convert the alternating current to direct current and feed it into the high-voltage electrical system. The efficiency of the energy transfer from the electrical grid to the battery is more than 90 percent. As soon as the battery is fully charged, the charging process stops automatically, and the charging station’s coil is automatically retracted. The driver can also interrupt the process at any time.
AWC technology is ideal for a home garage or office parking place. Its operation is not impaired by rain or a thin layer of snow. The technology is suitable for outdoor use, and it is protected against theft by screw bolts in the ground. There is no risk to people or animals, because the magnetic field is only generated when a car is positioned over the pad and the charging process is actively running. The safety concept is rounded out by detection of metal objects and mechanical pinch protection.