20150043660 | CLOSED-CIRCUIT POWER LINE COMMUNICATION SYSTEM FOR LARGE CAPACITY LOAD - The present invention relates to a power line communication system for a large capacity load which greatly improves the recognition ratio and accuracy of a communication signal even for a large capacity load in that it: includes a switch unit as a transmission means wherein a first switch made of semiconductor elements and a second switch made of relay elements are connected in parallel; and generates and transmits a communication signal by selectively using the switches. | 02-12-2015 |