| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide inductance adjustment means that excels in mass productivity and does not induce magnetic saturation or require standby power. <P>SOLUTION: Coils 21, 22 are wound around a coil part 11 of a core case via gaps 161, 162. The core case houses a soft-magnetic toroidal core, and magnetic fluxes that once rotate in the toroidal core are generated when the coils 21, 22 are energized. When a magnet flux generated in the magnetic core by conduction current flowing to the coil 21 and a magnet flux generated in the magnetic core by conduction current flowing to the coil 22 are reversely arranged at the points nearest to the gaps 161, 162, inductance in a normal mode is generated. When the two magnet fluxes are arranged in the same direction, inductance in a common mode is generated. When a gap equals to or is longer than one-sixth of magnetic path length of the core, inductance in the normal mode increases. When a gap is made equal to or smaller than five eighteenth of the magnetic path length of the core, inductance decrease in the common mode can be suppressed. <P>COPYRIGHT: (C)2012,JPO&INPIT |
