Air conditioner

摘要

An indoor-unit transmission/reception unit and an outdoor-unit transmission/reception unit are connected via a first signal line, and another indoor-unit transmission/reception unit and another outdoor-unit transmission/reception unit are connected via a second signal line. A first return switch is connected between a first power supply line and the first signal line, and a second return switch is connected between the first power supply line and the second signal line. A first end of a second switch is connected to the first power supply line, and a second end of the second switch is connected to the cathodes of two diodes. The anodes of the first and the second diodes are connected to the first and the second signal lines, respectively. A common end of the second switch is connected to the first end or the second end thereof. An outdoor-power supply unit is fed with electric power from the common end of the second switch and the second power supply line.

主权项

1. An air conditioner comprising:
a first power supply line and a second power supply line between which electric power is applied; an outdoor unit; a plurality of indoor units; and a plurality of signal lines which are provided corresponding to each of said indoor units and each serves as a medium of transmission and reception of signals between each of said indoor units and said outdoor unit, each of said indoor units including: an indoor unit control unit; an indoor-power supply unit which is fed with electric power from said first power supply line and said second power supply line and supplies indoor-unit controlling power to said indoor-unit control unit; an indoor-unit transmission/reception unit which is connected to one of said signal lines, the one corresponding to each of said indoor units, and performs said transmission and reception of signals with said outdoor unit; and a return switch which is connected between said one of said signal lines and said first power supply line, and whose conduction/non-conduction is controlled by said indoor-unit control unit, said outdoor unit including: an outdoor-unit control unit; a first switch which has one end connected to said first power supply line and the other end, and whose conduction/non-conduction between said first end and said other end is controlled by said outdoor-unit control unit; a second switch which has a first end connected to said first power supply line, a second end, and a common end to which only one of said first end and said second end is connected based on a control by said outdoor-unit control unit; a plurality of diodes which are provided corresponding to each of said indoor units and respectively have anodes connected to corresponding one of said signal lines and a cathode connected to said second end; an outdoor-power supply unit which is connected to said common end and said second power supply line; connected to said first power supply line via said second switch, or via said second switch, said diodes and said return switches; and supplies outdoor-unit controlling power to said outdoor-unit control unit; a plurality of outdoor-unit transmission/reception units which are provided corresponding to each of said indoor units and each connected to corresponding one of said signal lines; and a compressor which receives electric power from said second power supply line and said other end, wherein said outdoor-unit control unit makes said first switch have conduction upon a start of power feeding of said outdoor-unit controlling power, and makes said first switch have non-conduction and makes said common end of said second switch connect with said second end upon a transition from a normal operation of said air conditioner to an operation standby; and wherein the transition into said normal operation is performed by making any of said return switches of said indoor units have conduction in said operation standby.