| 摘要 |
<p>The present invention relates to a pickup coil which is installed at a moving unit moving along a power supply track in a wireless power transmission device supplying power wirelessly to the moving unit and to which electromotive force is induced by magnetic flux generated on an induction line, and to a secondary protection circuit supplying power to the moving unit by the high frequency alternating current electromotive force induced by the pickup coil. The wireless power transmission device generally has a drawback in that there is no proper solution for blocking a primary inverter if a secondary circuit has irregularities such as over voltage, over current, and overheating, since the distance between the first inverter supplying high frequency power to the induction line and a second device including a pickup coil installed at the moving unit, a resonant circuit, and a rectifying unit is great and it is difficult to know the state of the secondary device without a separate communication device. In order to overcome said disadvantage, the present invention provides a secondary protection circuit which senses an irregularity if the secondary device has the irregularity, heats a magnetic heat wire by means of induction, and quickly shorts both terminals of the pickup coil to completely block rectifier input.</p> |
