| 摘要 |
<p>The present invention relates to a wireless power transmission device and method, wherein power is wirelessly transmitted to a power receiving device by high transmission efficiency, and the wireless power transmission device comprises: a first power transmission coil which transmits a first power signal; a second power transmission coil which is the same as the first power transmission coil in terms of size and winding number, is stacked concentrically with the first power transmission coil, and transmits a second power signal having a phase difference of 180° from the first power signal; and a power supply unit which supplies alternating current power to the first power transmission coil and the second power transmission coil such that the first power signal and the second power signal have the phase difference of 180°.</p> |
