| 摘要 |
<p>This wireless power feeder (110) according to one embodiment of the present invention is a wireless power feeder for supplying power, without contact therewith, to a wireless power receiver (120) having a power-receiving resonant circuit (122) that contains a power-receiving coil (7) and a power-receiving capacitor (8), the wireless power feeder (110) being provided with: a power-feeding coil (1); a resonant current detector (6) for detecting the resonant current of the power-receiving resonant circuit (122); and a control circuit (111) for causing power to be supplied from the power-feeding coil (1) to the power-receiving coil (7) on the basis of the magnetic field resonance phenomenon between the power-feeding coil (1) and the power-receiving coil (7), by supplying the power-feeding coil (1) with an alternate current, and for associating the frequency of the alternate current with the frequency of the resonant current detected by the resonant current detector (6). Therein: the power-feeding coil (1) does not substantially configure a resonant circuit; the resonant current detector (6) has a detection resonant circuit (112) including a detection coil (6a) and a detection capacitor (6c), and detects the resonant current of the power-receiving resonant circuit (122) on the basis of the magnetic field resonance phenomenon between the detection coil (6a) and the power-receiving coil (7); the coiling region of the detection coil (6a) in the resonant current detector (6) is smaller than the coiling region of the power-feeding coil (1); and the detection coil (6a) in the resonant current detector (6) is positioned in a manner such that the coiling center axis thereof forms an angle of 80-100°C in relation to a magnetic field vector formed by the power-feeding coil.</p> |
