JUYOKANAITEIATSUDENRYOKUSENNYORUTSUSHINHOSHIKI

摘要

PURPOSE:To provide a communication system by a low voltage power line in the customer's premise for surely transmitting information with a simple circuit structure. CONSTITUTION:A switching control element 6 is connected in series in the transmitting side of a low voltage power line 2 of the commercial frequency in a customer's premise and the rise from zero potential of the fall of the commercial frequency voltage 3 of the low voltage power line 2 is delayed selectively for the predetermined electrical angle alpha with the switching control element 6 in order to form a cutout portion 4 of the voltage. The number of cutout portions and interval are determined corresponding to communication information and such communication information can be received by detecting the number of cutout portions and the interval in the receiving side.