JPH0820097B2 - Air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to an air conditioner including a master unit and a plurality of slave units that are simultaneously controlled by a single remote controller.

[Conventional technology]

In an air conditioner for business use, for example, 16 air conditioners A01, A02, ... A16 can be controlled all at once by a serial signal issued from one remote controller 1 as shown in FIG. is there.

In the case of such a simultaneous control, the remote controller 1 is operated by the master unit A01 between the remote controller 1 and the air conditioner A01 called the master unit.
A power line 2 for supplying electric power to the device, a signal line 3 for communication between the two, and a ground line 4 are connected to each other, which is called a slave unit.
The 15 air conditioners A02 to A16 are sequentially connected to the signal line 3 and the ground line 4 connected to the master unit A01.

As shown in FIG. 3, each of the air conditioners A01 to A16 is a power supply voltage unit that drives a compressor or the like (not shown).
16, a voltage conversion unit 17 for converting an AC voltage supplied from the power supply voltage unit 16 into a predetermined DC voltage, and the remote controller 1
And a transmission / reception circuit (not shown) for communicating with the low voltage section 18, and further, as shown in FIG. 4, a terminal T2 and the transmission / reception circuit in the low voltage section 18. The signal line 19 that connects the
R1 and diode D1 are installed in parallel and the same signal line
A diode D2 is connected between 19 and ground.

The circuit composed of the diodes D1 and D2 is a surge absorbing circuit.

[Problems to be Solved by the Invention]

However, in the case of simultaneously controlling a plurality of air conditioners configured as described above, even if the master A01 is operating normally, if any of the slaves A02 to A16 has a power failure,
The voltage at the DC power source terminal T6 (Fig. 4) of the slave unit that has experienced a power failure changes from 12V during operation to 0V.

At this time, when the input signal voltage 12V is applied from the signal line 3 from the remote controller 1 to the signal line 19 of the slave unit at the time of power failure, the internal impedance of the DC power supply in the slave unit is originally very small, and therefore, as shown in FIG. A large current will flow in the direction of the arrow shown, and this large current will decrease the potential between terminals T2 and T3, which will also decrease the input signal voltage of other normal masters and slaves. There is a problem that communication between the master unit and all slave units is disabled.

Therefore, the present invention provides an air conditioner that solves such a problem and can properly operate the other slaves and the master even if any one of the slaves has a power failure. It is an object.

[Means for solving the problem]

The present invention has been made to solve the above problems, and includes a master unit that supplies power to a remote controller, and a plurality of slave units that are sequentially connected to a signal line from the remote controller together with the master unit. In the air conditioner that is simultaneously controlled by the serial signal emitted from the remote controller, all the slave units except the master unit are provided with relays that open the signal line in the event of a power failure.

[Action]

With the above configuration, a relay that opens the signal line in the event of a power failure is provided in all of the multiple slaves that are connected to the signal line from the remote controller, so the signal voltage flowing to the DC power supply during a power failure can be reduced. It can be cut off and the signal voltage can be prevented from dropping.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a connection diagram for simultaneously controlling a plurality of air conditioners, where 1 is a remote controller, A01 to A16 are air conditioners controlled by the remote controller 1, and A01 is a parent for supplying power to the remote controller 1. Machines A02 to A16 are slaves that are controlled together with the master A01.

Connect the power supply line 2 between the remote controller 1 and the terminals T1 and T1 of the master unit A01, the signal line 3 between the terminals T2 and T2, and the ground line 4 between the terminals T3 and T3, and the master unit A01 and the slave unit. A signal line 3 and a ground line 4 are sequentially connected between A02 and terminals T2-T2 and terminals T3-T3 of adjacent child devices.

The terminals T4 and T5 of the master unit A01 and the slave units A02 to A16 are all terminals for connecting commercial power sources, and these terminals are connected to respective power sources via the plug 5 for each unit.

FIG. 2 is an internal configuration diagram in which one of a plurality of slave units A02 to A16 having the same content is taken out. Inside the power source voltage unit 6 for driving a compressor or the like (not shown), and this power source. Voltage section 6
There is a voltage conversion unit 7 for converting an AC voltage of 100 V supplied from the device into a DC voltage of 12 V, and a voltage stopping unit 8 including a transmission / reception circuit (not shown) composed of low voltage components such as a microcomputer. , A relay 11 is provided between the power lines 9-10 connecting the power supply pressure unit 6 and the terminals T4 and T5, and the relay 11
The contacts 11a and 11b of the interposition are interposed between the signal line 13 and the ground line 14 that connect the low voltage section 8 and the terminals T2 and T3, and
A power line 12 for supplying a predetermined DC voltage to the remote controller 1 side is connected between the terminal T1 and the terminal T1.

Both contacts 11a, 11b of the relay 11 are designed to be opened when a commercial power supply supplied to the power supply voltage section 6 is cut off and a power failure occurs. , T3 is automatically opened.

Therefore, the input signal voltage to the slave unit at the time of power failure can be cut off, and a large current generated in the slave unit at the time of power failure can be prevented by cutting off the input signal voltage. The voltage drop can be prevented, and all air conditioners except the slave unit at the time of power failure can be operated normally.

〔The invention's effect〕

In the case of the air conditioner as described above, a relay that opens the signal line of the slave unit at the time of power failure is installed in all of the slave units that are connected to the signal line from the remote controller. Since the signal voltage is prevented from dropping due to a large current generated in the slave unit at the time, it is convenient because all the units except the slave unit at the time of power failure can be continued.

[Brief description of drawings]

FIG. 1 is a simultaneous control connection diagram of an air conditioner showing the present invention and a conventional example, FIG. 2 is an internal configuration diagram of a slave unit showing an embodiment of the present invention, and FIG. 3 is an air conditioner showing a conventional example. FIG. 4 is an internal configuration diagram of the machine, and FIG. 4 is a main circuit diagram for explaining the flow of the input signal voltage at the time of power failure of the conventional machine. In the figure, 1 ... remote control, A01 ... main unit, A02 to A16 ... slave unit, 2 ... power line, 3 ... signal line, 4 ... ground line, 5
...... Plug, 6 ...... Power supply voltage section, 7 ...... Voltage conversion section, 8
...... Low voltage part, 9,10 ...... Power line, 11 ...... Relay, 11a, 11
b ... contact, 12 ... power line, 13 ... signal line, 14 ... ground line.

Claims (1)

[Claims] 1. A master unit for supplying electric power to a remote controller, and a plurality of slave units that are sequentially connected to a signal line from the remote controller together with the master unit, and are simultaneously controlled by a serial signal issued from the remote controller. In the air conditioner according to the present invention, all the slave units except the master unit are provided with a relay that opens a signal line in the event of a power failure.