| 摘要 |
A power line noise filter for effectively reducing the sadden noise as well as the continuous noise in a wide frequency band on a power line. A detection circuit (11) of a power line noise filter (10) detects fluctuation of the current flowing through a conductive lines (1a, 1b) of a power line (1) to detect current common mode noise on the power line (1). An opposite-phase signal generating circuit (12) generates an opposite-phase signal the phase of which is opposite to that of the noise detected by the detection circuit (11). A pouring circuit (13) imparts the same current variation as that of the opposite-phase signal to the two conductive lines (1a, 1b). Thus, the current common mode noise on the power line (1) is canceled.
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