| 摘要 |
The purpose of the present invention is to provide a power transmission device capable of highly accurate discrimination between a device placed on a secondary side and a foreign object without additional complex circuitry. The power transmission device comprises: a control unit (5a) for setting the drive frequency of a signal which drives a resonant circuit; an inverter unit (2) for driving the resonant circuit at three or more drive frequencies on the basis of the settings of the control unit (5a); and a waveform monitoring unit (4) for detecting the drive waveform of the resonant circuit. The control unit (5a), in accordance with the procedures of a program stored in a storage unit (5b), sets the three or more drive frequencies, compares signal data in each drive frequency detected by a drive waveform detection unit, and detects a power receiving device (50) on the basis of the comparison results. |
