| 摘要 |
<p>A wireless power transmission device is provided with: a plurality of oscillators (103) for converting DC energy into RF energy having frequency f0; delivery antennas (107) for delivering the RF energy; and receiving antennas (109) for receiving at least part of the RF energy delivered by the delivery antennas (107). Energy received by the receiving antennas is combined in a parallel arrangement and then outputted. Each of the delivery antennas (107) is a series resonant circuit in which a delivery inductor (107a) and a first capacitive element (107b) are connected in series; and each of the receiving antennas (109) is a parallel resonant circuit in which a receiving inductor (109a) and a second capacitive element (109b) are connected in parallel. The relationship (L2/L1) = 4(k/Voc)2 is satisfied, where Voc is the step-up ratio of the oscillators (103), L1 the inductance of the delivery inductor (107a), L2 is the inductance of the receiving inductor (109a), and k is the coupling coefficient between the delivery antennas (107) and the receiving antennas (109). The absolute value ?res of the phase difference between resonant magnetic fields in a first resonant antenna pair and a second resonant antenna pair is set to 90-180 degrees.</p> |
