Wireless power transfer using separately tunable resonators

A circuit comprising:

• a resonator circuit for wireless transmission of energy, the circuit comprising:
• a transmitter coil having a large number of windings N1;
• a variable capacitance device connected in shunt across the transmitter coil with the transmitter coil and the variable capacitor and intrinsic capacitance of the transmitter coil forming the resonator circuit;
• an input coil configured to be coupled to an input RF source, with the input coil having a low number of windings N2 compared to the number of windings N1 of the transmitter coil, and the input coil being inductively coupled to the transmitter coil to provide power output from the circuit with the resonator circuit having a resonant frequency in a range of about 100 kHz to 30 MHz.

A system for wireless energy transfer, the system comprises:

• a circuit for wireless transmission of energy, the circuit comprises:
• a first resonator circuit comprising:
• a transmitter coil having a large number of windings N1;
• a variable capacitance device connected in shunt across the transmitter coil with the transmitter coil and the variable capacitor and intrinsic capacitance of the transmitter coil forming the resonator circuit;
• an input coil configured to be connected to an input RF source, with the input coil having a low number of windings N2 compared to the number of windings N1 of the transmitter coil, and the input coil being inductively coupled to the transmitter coil to provide power output from the resonator circuit at a resonant frequency in a range of about 100 kHz to 30 MHz;
• a circuit for wireless reception of energy, the circuit comprises:
• a second resonator circuit comprising:
• a receiver coil inductively coupled to the transmitter coil, the receiver coil having a large number of windings N3;
• a variable capacitance device connected in shunt across the receiver coil with the receiver coil and the variable capacitor and intrinsic capacitance of the receiver coil forming the second resonator circuit;
• an output coil with a low number of windings N2 compared to the number of windings N1 of the receiver coil, the output coil being inductively coupled to the receiver coil to provide power output from the circuit, with the resonator circuit having a resonant frequency in a range of about 100 kHz to 30 MHz.

A system for wireless energy transfer, the system comprises:

• a table;
• a circuit embedded in the table for wireless transmission of energy, the circuit comprises:
• a first resonator circuit comprising:
• a transmitter conductor;
• a variable capacitance device connected in shunt across the transmitter conductor with the transmitter coil and the variable capacitor and intrinsic capacitance of the transmitter coil forming the resonator circuit.