Method and apparatus for wireless power transmission with harmonic noise cancellation

A wireless power transmission apparatus comprising:

• a source resonator configured to transmit an output power to a wireless power reception apparatus by resonating with a target resonator of the wireless power reception apparatus;
• a resonant power generator comprising:
• a first power amplifier comprising a first notch filter and configured to generate a first input signal;
• and
• a second power amplifier comprising a second notch filter and configured to generate a second input signal;
• wherein the resonant power generator is configured to cancel an even-order harmonic component of the output power by differentially inputting the first input signal and the second input signal to the source resonator, and cancel a third harmonic component of the output power using the first notch filter and the second notch filter;
• and
• a low-pass filter (LPF) coupled to the first and second notch filters and configured to cancel a fifth or higher odd-order harmonic component of the output power;
• wherein the source resonator is further configured to transmit, to the wireless power reception apparatus, the output power from which the even-order harmonic component, the third harmonic component, and the fifth or higher odd-order harmonic component have been cancelled.

A wireless power transmission method in a wireless power transmission apparatus, the method comprising:

• generating, via a resonant power generator, a first input signal and a second input signal;
• differentially inputting, via the resonant power generator, the first input signal and the second input signal to a source resonator and cancelling an even-order harmonic component of the output power;
• cancelling, via a low-pass filter (LPF) and first and second notch filters coupled to the LPF, a harmonic component comprising a third harmonic component and a fifth or higher odd-order harmonic component of an output power of the source resonator;
• and
• transmitting, via the source resonator, the output power from which the harmonic component including the third harmonic component and the fifth or higher odd-order harmonic component has been cancelled to a wireless power reception apparatus by resonating with a target resonator of the wireless power reception apparatus.