| 摘要 |
PURPOSE:To improve the characteristics of a duplicated direct current in order to increase an inductance in the case of a small direct current in a choke coil by winding a ring wound iron core inserted with a high permeability material in a gap provided in the part of the cross section of the ring iron core. CONSTITUTION:In the case of a small duplicated direct current in a chock coil and the smaller current wherein a high permeability material 3 is not magnetically saturated, the value of an inductance is determined by the sum of the permeability of a ring wound iron core 11 inserted with the high permeability material and the permeability of a ring wound iron core 12 without a gap. If the current is increased and the high permeability material 3 is magnetically saturated, the valve of the inductance is determined by the sum of the permeability of the ring wound iron core 11 which has a gap and the permeability of the ring wound iron core 12 which has not a gap. If the duplicated direct current is increased and the ring wound iron core 12 without a gap is magnetically saturated, the value of the inductance is determined by the permeability of the ring wound iron core 11 which has the gap. In this way, the choke coil wherein the inductance is rapidly increased can be obtained if the duplicated direct current is less compared with the inductance when the duplicated direct current is greater. |
