| 摘要 |
PURPOSE:To prevent communication by connecting a coil and a capacitor in series and selecting combined impedance to be inductive at carrier frequencies thereby facilitating the insulation because of small size and blocking the signal. CONSTITUTION:A coil 13 and a capacitor 4 form a parallel resonance circuit to increase the impedance at the carrier frequencies thereby preventing the attenuation of the signal voltage. When the inductance of the coil 13 is selected to be 10muH and the capacitance of the capacitor 14 is selected to be 0.33muF, the series resonance frequency is 87.6kHz and the impedance is inductive at a carrier frequency of 125kHz of power line carrier communication. When the capacitance of the capacitor 4 of the device is selected to be 0.33muF, the impedance improving device 12 and the capacitor 4 cause parallel resonance at 125kHz, and the load impedance is infinite by a signal sent through a lighting line 2 to avoid the reduction in the signal voltage.
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