| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a coil component which has an inductance value changing according to the magnitude of a load current (a DC superimposed current) and is suitable for simplification of the manufacturing and downsizing, and to provide a power supply device using the coil component.SOLUTION: A coil component 100 includes: a ring shaped first magnetic core forming a closed magnetic circuit; and a coil 2 which is wound around the first magnetic core in a spiral manner. The coil component 100 includes a second magnetic core 3, which has the magnetic permeability lower than that of the first magnetic core and forms a closed magnetic circuit, at the inner side of the coil. It is preferable to dispose the second magnetic core between an outer peripheral surface of the first magnetic core and the coil.</p> |
