Siemens' contactless charging station is connected to the grid by wires buried underground. A secondary coil is attached to an electrified vehicle and a charge, induced by a magnetic field, is sent across an air gap of up to six inches. The wireless charging process is claimed to be more than 90 percent efficient.
Starting in May, a prototype 3.6 kW contactless charger will be tested. Then, in June, the test trials in Berlin, which aim to determine if modifications are needed before integrating the inductive charging system into mass-produced vehicles, will kick off.
[Source: Green Car Congress]