| 摘要 |
PURPOSE:To stop both normal and common mode noises of high frequency over a wide band range by additionally using a magnetic material such as a core or a magnetic sheet having less decrease of effective magnetic permeability in high frequency. CONSTITUTION:When a high frequency common noise Nc is fed from input terminals 1, 1', magnetic fluxes phic4, phic5 generated in closed magnetic paths of cores 4, 5 are generated by windings 8, 9 in the same direction. Accordingly, the both magnetic fluxes strengthen each other to operate at large inductance for common mode noise Nc of high frequency at the primary side. Then, when the normal mode noise Nn of high frequency wave is input from the input side, magnetic fluxes generated in the closed magnetic paths of the cores 4, 5 becomes by windings 8, 9 opposite directions, and cancel each other. Thus, the windings 8, 9 and the cores 4, 5 do not affect influence to the primary side Nn for the nornal mode noise Nn. |
