| 摘要 |
PROBLEM TO BE SOLVED: To eliminate the need for new electric wiring, and miniaturize an indoor electrical appliance by receiving a commercial power supply by an indoor machine, by giving the starting timing of communication by an indoor control circuit via a modulation/demodulation circuit to indoor and outdoor machines, and by providing a communication prohibition zone. SOLUTION: A commercial power supply 9 being used as the power supply of an air conditioner is received by an indoor machine 13, and is transferred to an outdoor machine 14 by a connection line 18. A DC power supply circuit 12 being provided in the outdoor machine 14 creates a DC power supply being supplied to an indoor control circuit 10 from the commercial power supply being transmitted from the indoor machine 13, and is supplied to the indoor control circuit 10 by the connection line 19. The indoor control circuit 10 is operated by the DC power supply being supplied by the connection line 19 and at the same time communicates with the outdoor control circuit 12 via a modulation/demodulation circuit 17 being connected to the connection line 19. Communication is made by modulating the DC power supply with a high frequency signal based on a communication signal. As a result, a wall service outlet for a room air conditioner inside a room can be used, and also the need for large parts for high voltage can be eliminated from an electrical appliance of the indoor machine 13. |
