Inductive power supply with device identification

A method of manufacturing a remote device for receiving wireless power from an inductive power supply, said method comprising:

• providing a secondary circuit including a secondary for receiving operating wireless power from the inductive power supply for the remote device at one or more resonant power transfer frequencies;
• electrically connecting resonant frequency signature circuitry including an identification capacitance in parallel the secondary, wherein the resonance frequency circuitry is selected to provide the remote device with a predetermined resonant frequency signature including one or more resonant identification frequencies different from the one or more resonant power transfer frequencies, wherein the predetermined resonant frequency signature identifies at least one of the remote device, a type of the remote device, a class of the remote device, and a manufacturer of the remote device;
• and
• whereby the resonant frequency signature allows the remote device to be identified.

A remote device for receiving wireless power from an inductive power supply, said remote device comprising:

• a secondary for receiving operating wireless power from the inductive power supply at one or more operating power transfer frequencies;
• resonant frequency signature circuitry including an identification capacitance in parallel the secondary that provides one or more predetermined resonant identification frequencies different from the one or more resonant power transfer frequencies, wherein the resonant frequency signature circuitry provides a resonant frequency signature that identifies at least one of the remote device, a type of the remote device, a class of the remote device, and a manufacturer of the remote device;
• and
• whereby the resonant frequency signature allows the remote device to be identified.

A remote device for receiving wireless power from an inductive power supply, said remote device comprising:

• a secondary for receiving wireless power at an operating power transfer frequency and for receiving wireless power at a predetermined identification frequency, wherein the wireless power received at the operating power transfer frequency is used as operating wireless power and the wireless power received at the predetermined identification frequency is used for identification;
• resonant frequency signature circuitry including an identification capacitance in parallel to the secondary, the resonant frequency signature including one or more predetermined resonant identification frequencies different from the operating power transfer frequency, wherein the resonant frequency signature identifies at least one of the remote device, a type of the remote device, a class of the remote device, and a manufacturer of the remote device;
• and
• wherein in response to the remote device receiving wireless power at the resonant frequency signature, resonance is established at the one or more predetermined resonant identification frequencies and conveyed through reflected impedance.