Hitachi Appliances, Inc

Hitachi, Ltd.

Noriyuki Bunkou

Tatsumi Yamauchi

Noboru Akiyama

Yasuyuki Kojima

Takeshi Onaka

Koichi Taniguchi

Koichi Tokushige

Keiji Sato

Masamichi Mochizuki

Tatsuya Sugiyama

Keiji Satou

Yoshiyukie Yamanashi

Masami Ozaki

An air conditioning system is arranged to use a power line for communication. The air conditioning system includes one or more indoor units, one or more outdoor units, and a system controller for controlling the indoor units or outdoor units and executes communications between the indoor units and the outdoor units as overlapping a signal on the power line for supplying electric power. The outdoor units are connected with the system controller through a leased communication line. The indoor unit provides a power line communication device being connected with the power line. The outdoor unit provides a leased communication device being connected with the leased communication line. A bridge is also provided for connecting the leased communication line and the power line. The control information is exchanged mutually between the indoor units, the outdoor units and the system controller through the power line.

Indoor and outdoor unit communication via signal from a power line

An air-conditioning system having a plurality of air conditioners, each air conditioner including an outdoor transmission/receiving unit for transmitting by superposing the operation data on an outdoor power line for supplying power to an outdoor unit and receiving the operation data superposed on the outdoor power line, an indoor transmission/receiving unit for transmitting by superposing the operation data on an indoor power line for supplying power to an indoor unit and receiving the operation data superposed on the indoor power line, an outdoor conversion unit for transmitting by converting the operation data superposed on the outdoor power line into a signal and receiving and superposing the signal on the outdoor power line, and an indoor conversion unit for transmitting by converting the operation data superposed on the indoor power line into a signal and receiving and superposing the signal on the indoor power line.

Air conditioning system

Growing community of inventors

Shizuoka, Japan

Noriyuki Bunkou