| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and equipment for keeping the stable magnetic coupling condition between a primary and a secondary coils. SOLUTION: An inverter circuit 22 installed in a power equipment 20 is provided with a switching circuit 26 for switching the voltage from a source of DC power 21 to the one having positive and negative voltages and then applying it to a primary coil 23. The switching circuit 26 switches the DC power according to a control circuit 27 and applies AC voltage E1 with one cycle, constituted of positive pulse voltage P1 of a large pulse duration and negative voltage P2 of a small pulse duration, to the primary coil 23. Due to this operation, current S1 in the primary coil 23 includes a DC component, which generates an attractive force between cores 24, 13 of the primary and the secondary coil. With this attractive force, the primary and the secondary cools 23, 12 are kept in a stable coupled condition. |
