COUPLER DEVICE AND POWER LINE COMMUNICATION SYSTEM HAVING THE SAME

摘要

A coupler device and a power line communication system including the same are provided to reduce an installation cost and a device cost by excluding an external device such as a cutout switch. A coupler device(130) comprises a fuse(131), a coupling capacitor(133), an inductor(135), a transformer(137), and a signal line(139). The fuse blocks an abnormal current. The abnormal current is an overload current or a transient current. The coupling capacitor separates a power line communication signal from an electric signal. The inductor grounds a signal of a low frequency band passing the coupling capacitor, and delivers a signal of a high frequency band to the signal line. The transformer receives a communication signal separated by the coupling capacitor, changes a level of a received communication signal, and delivers the communication signal to the signal line. The signal line delivers the communication signal received from the transformer to a power line communication modem.