Interphase transformer based rectifier for wireless power transfer

A wireless power transfer system comprising:

• a transmitter circuit comprising an inverter adapted to receive a DC input voltage and generate an AC output voltage for application to a transmitter coil;
• and
• a receiver circuit comprising:
• a receiver coil configured to have an alternating current induced therein by the transmitter coil;
• a rectifier coupled to the receiver coil and configured to rectify a current delivered to a load;
• and
• an interphase transformer coupled to the rectifier, the receiver coil, and the load, wherein the interphase transformer is configured so that respective winding currents of the interphase transformer sum together to deliver to the load a current that is twice the alternating current induced in the receiver coil.

A wireless power transfer receiver circuit comprising:

• a receiver coil having a first terminal and a second terminal, the receiver coil being configured to have an alternating current induced therein by a transmitter coil;
• an interphase transformer having a first terminal coupled to a first terminal of the receiver coil, a second terminal coupled to a first terminal of a load, and a third terminal coupled to the second terminal of the receiver coil;
• and
• a rectifier comprising first and second switching devices, the first switching device having a first terminal coupled to a second terminal of the load and a second terminal coupled to the second terminal of the receiver coil, and the second switching device having a first terminal coupled to the second terminal of the load and a second terminal coupled to the first terminal of the receiver coil.