Wireless high power transfer

A method for wirelessly transferring power from a primary side across an airgap to a secondary side, including the steps of

• f) converting an input power to an AC primary output power by means of an input stage, receiving the AC primary output power and inducing a magnetic field for wireless power transfer by means of a primary resonator,
• g) converting the power received through the magnetic field to an AC secondary output power by means of a secondary resonator and converting the AC secondary output power to a DC secondary output power by means of an output stage,
• characterised in that the steps of converting the power received through the magnetic field to an AC secondary output power and converting the AC secondary output power to a DC secondary output power include the steps of
• h) converting the power received through the magnetic field to a plurality of AC secondary output power parts by means of at least two secondary resonating circuits connected in parallel,
• i) converting the plurality of AC secondary output power parts to a plurality of DC secondary output power parts and
• j) combining the plurality of DC secondary output power parts to provide the DC secondary output power by connecting them in parallel,
• wherein
• k) converting the power received through the magnetic field by a secondary resonating circuit includes converting the power received through the magnetic field by a resonating path with a series connection of a resonating capacitor and a resonating inductor including a winding wound on a magnetic core element and
• l) balancing a current flow within the resonating path by providing the resonating path with a symmetry inductance connected in series with the resonating inductor and the resonating capacitor of that resonating path.