| 摘要 |
PURPOSE:To provide a switching device for decreasing noises ranging from 20 to 30kHz without enlarging the electronic capacities of a common mode choke coil and a capacitor, and also decreasing common and normal mode noises that are transmitted to an AC power source 2. CONSTITUTION:A switching device comprises a common mode choke coil (L2) that is provided with a low-frequency voltage from an AC power source (2) so as to decrease a high-frequency common mode noise transmitted through a line, a common mode filter (3) with a capacitor, a rectifying means (D1) for rectifying a low-frequency voltage received through the common mode filter, a normal mode filter (4) that decreases a high-frequency normal mode noise transmitted through a DC line and at the same time, smoothes the rectified waveform received from the rectifying means to generate an output, and a switching means that provides switching operation for the output received from the normal mode filter. |
