Wireless power transmitter including miniaturized inverter for reducing harmonics

A wireless power transmitter comprising:

• a transistor configured to output an amplified signal based on an input signal and a driving voltage;
• a first capacitor coupled to the transistor in parallel;
• a first LC resonant circuit coupled to the transistor in parallel and including a first inductor and a second capacitor coupled to the first inductor in series;
• a transformer coupled to an output terminal of the transistor and including a first coil coupled to the first LC resonant circuit in parallel and a second coil wound on a ferrite core on which the first coil is wound;
• a third capacitor coupled to the second coil in series;
• a feeding coil, including a first part and a second part, coupled to the third capacitor in series and configured to form a second LC resonant circuit with the third capacitor, wherein the first part of the feeding coil and the third capacitor form the second LC resonant circuit, and wherein an inductance value of the second part of the feeding coil is determined based on at least one of an inductance value of the transmission coil or a magnetic coupling coefficient between the transmission coil and the feeding coil;
• and
• a transmission resonator including a transmission coil and a fourth capacitor coupled to the transmission coil in series,
• wherein at least a part of the transmission coil is magnetically coupled with the feeding coil, and
• wherein at least a part of power received from the feeding coil is output to an outside through the transmission resonator.