NONCONTACT POWER TRANSMISSION DEVICE

摘要

PROBLEM TO BE SOLVED: To optimize power transmission efficiency. SOLUTION: A noncontact power transmission device is composed of a transformer 12 which has a primary coil L1 to which a high frequency voltage is applied by a high frequency power supply 11 and a secondary coil L2, in which an electromotive force is induced in accordance with the high frequency voltage applied to the primary coil L1 to obtain the induced voltage, and is constructed so as to have the primary coil L1 and secondary coil L2 detachably attached to each other in a noncontact manner with a predetermined gap therebetween; a capacitor C1 connected in parallel to the secondary coil L2; and a half-wave rectifier diode D1 which rectifies the voltage induced in the secondary coil L2 into a DC voltage which is transmitted to a secondary battery B. If the capacitance of the capacitor C1 is set to match the time when the polarities of the high frequency voltage and the induced voltage are reversed and the time when an oscillation voltage value produced in the capacitor C1 reaches an extreme value, the efficiency of power transmission to the secondary battery B can be optimized.