Patent ID: 8594567

Claim:
A method for contactless charging of an energy storage unit of an energy sink by an energy source, wherein both carrier signals as well as sidebands of alternating fields must be maintained, with their radiated power, within limiting values defined for these wavebands, comprising the steps: providing at least two devices operating in a first operating mode, wherein each of the at least two devices are usable as an energy source or an energy sink in the first operating mode; exchanging data in the first operating mode to determine which of the at least two devices acts as the energy source and as the energy sink; switching the devices to a second operating mode or a third operating mode; transferring data between the energy source and the energy sink via an alternating field in the second operating mode of the energy source, wherein the alternating field comprises a carrier signal and modulation sidebands; and transferring energy necessary for charging from the energy source to the energy sink via the alternating field in the third operating mode of the energy source; wherein in the third operating mode no data are transferred from the energy source to the energy sink, the alternating field thus does not include pronounced sidebands, and the alternating field is produced with a field strength that is greater than a maximum possible field strength defined by the limiting values upon simultaneous transfer of data and charging energy, wherein the energy source changes to the third operating mode only after an end of a predetermined minimal dwell time of the energy sink in the alternating field, and wherein the predetermined minimal dwell time of the energy sink staying in the alternating field is measured after an end of a completed transaction between energy source and energy sink.