| 摘要 |
PURPOSE: A coupling circuit for a PLC(Power Line Communication) is provided to improve communication efficiency by minimizing an RF(Radio Frequency) noise of a communication signal transmitted through a power line. CONSTITUTION: A transformer(41) connects to an AC power line, has the uniform number of winding between a primary coil and a secondary coil, and electrically isolates the primary coil and the secondary coil. An RC parallel circuit(42) installed in the primary coil of the transformer(41) and the power line corrects an impedance change according to the length change of the power line. The RC parallel circuit(42) prevents a signal attenuation, and prevents an RF noise by a residual communication signal.
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