JPS6252346A - Control device for air conditioner - Google Patents

Abstract

PURPOSE:To make it possible to carry out an indoor/outdoor bidirectional communication by connecting rectifying elements reversely and symmetrically between both poles of each of power lines on the indoor side and the outdoor side, connecting junction points of respective rectifying elements with a single signal line, and controlling signal transfer elements interposed in the middle of the signal line. CONSTITUTION:In a separate type air conditioner, a pair of rectifying elements 11a and 11b are connected in series, reversely between both poles of a power line 2 on the indoor A side. A pair of rectifying elements 12a and 12b are connected between both poles of a power line 2 on the outdoor B side. Further, a signal line 4 is connected between a junction point of indoor side rectifying elements and a junction point of outdoor side rectifying elements so that a signal current flows from one pole of the indoor side power line and the other pole of the outdoor side power line. In the door side signal line, a signal transfer element 15 for transmission and a signal transfer element 16 for reception are interposed in series, and further in the outdoor the signal line, a signal transfer element 17 for transmission and a signal transfer element 18 for reception are interposed in series, and even when wiring is made irrespective of the polarity of the power line on the outdoor side, the signal transfer elements are controlled so that the the bidirectional communication is performed both indoors and outdoors.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a control device for a separate air conditioner, and particularly to an air conditioner that performs communication control for indoor and outdoor sides using a single signal line. The present invention relates to a control device.

[Conventional technology]

FIG. 7 is a circuit diagram showing a control device for a conventional separate type air conditioner of this type. In the figure, 1 is indoor unit A
AC power supply installed in 2#: outdoor unit) B
The two power lines that energize the compressor 3 are connected to one signal a4 that transmits a control signal from one pole on the indoor side to the other pole on the outdoor side. 05 is the signal line 4 on the indoor side. 7 optical couplers are interposed as receiving signal transmission elements, and are composed of a photodiode 5a and an original transistor 5b. 6 is a communication control circuit composed of a microcomputer or the like, 1 is a variable resistor for temperature adjustment, 8 is an indoor temperature detection element, and 9ri is a relay driven by the communication control circuit 6, which is interlocked with the open/close switch 9a. ing. 10
is a thermal reed switch that operates by sensing the outdoor temperature.

A separate air conditioner configured as described above can be used indoors (
As an internal/external connecting wire between the till unit A and the outdoor unit B, there are a minimum of two silver power lines 2 and one signal line. Then, normally a variable resistor 7, an i degree detection element 8
The communication control circuit 6 drives the relay 9 in accordance with signals from the compressor 3, etc., and controls the d-power and stop of the compressor 3. Here, when the outdoor temperature exceeds a predetermined temperature, the switch 10 is closed, the photodiode 5a of the photocoupler 5 lights up, and the phototransistor 5b is turned on.Thus, the communication control circuit 6 detects the outdoor temperature. be able to. in this way,
Information outside the room can be detected, but this is relay 9
The above-mentioned information can be detected while the switch 9a is closed by driving, and at this time, the signal line 4 and the communication control circuit 6 are insulated by the photocoupler 5,
The communication control circuit 6 is insulated from high-voltage alternating current and can receive and receive information from outside the room.

[Problem that the invention seeks to solve]

The conventional air conditioner control device f is configured to transmit only information from the outdoor side to the indoor side, as described above.
There was a problem in that information from the indoor side could not be transmitted to the outdoor side, and only simple information such as whether the outdoor temperature was above a certain value could be communicated. Furthermore, there is a problem in that if the polarity of the power line 2 is reversed (reversed) on the indoor side, communication cannot be performed.

This invention was made to solve these problems, and allows bidirectional communication between the indoor and outdoor sides, as well as transmitting various necessary information. It is an object of the present invention to provide a control device for an air conditioner that can perform communication operations even if the polarities are reversed.

[Means for solving problems]

In a separate air conditioner that uses two power lines that supply AC power to the compressor and one signal line that transmits control signals as an indoor/outdoor connecting wire between the indoor side and the outdoor side, the power line on the indoor side A rectifying element is connected in series in opposite directions between the two poles of the power line, and a rectifying element is also connected in the opposite direction between both poles of the power line on the outdoor side, and the connection point of the rectifying element on the indoor side and the rectifying element on the outdoor side are connected. Connect the signal line between the points so that a signal [flow] flows from one pole of the indoor power line to the other pole of the outdoor power line, and connect the indoor signal line for transmission and reception. signal transmission elements are installed in series, and signal transmission elements for transmission and reception are installed in series in the signal line on the outdoor side, and these signal transmission elements are installed on the indoor side and the outdoor side, respectively. Equipped with a communication control circuit for control.

[For production]

The communication control circuit controls each signal transmission element to switch the shunt current from the AC power supply flowing through the signal line. This allows for two-way communication between the indoor and outdoor sides.
It is also possible to transmit complex information by turning ON and OFF the signal transmission elements. Furthermore, since the rectifying elements are connected symmetrically and in opposite directions, communication is possible even if the polarities of the power lines are reversed.Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the same or equivalent parts as those in the conventional FIG. 7 are given the same reference numerals and the details are omitted.

FIG. 1 is a circuit diagram showing an embodiment of the present invention, in which two power lines 2 and one signal line 4 are provided as an internal/external connecting wire between the indoor 11t11 and the outdoor 1111, as in the conventional case. In the figure, rectifying elements 12a, 12a, 12a, 12a, 12a, 12a, 12a, 12a, 12a, 12a, 12a, 12a, 12a, 12a, 12a, 12b, 12a, 12a, 12a, 12a, 12a, 12a, 12a, 12a, 12a, 12a, 12a, 12a, 12a, 12a, 12a, 12a, 12a, 12a, 12a, 12a, 12a, llb, 12a, lib, lib, and the power line 20 of the outdoor I11.
btf1 A rectifying element connected in opposite directions between the poles of the power line 2 on the outdoor side, so that the shunt current (signal current) from the source 1 always flows from one pole of the power line 2 on the indoor side to the power line 2 on the outdoor side. rectifier 11a, respectively, so that the flow flows to the other pole of the rectifier 11a,
If-b and 12a.

A signal line 4 is connected to each connection point of 12b via a resistor 13.14. 16. 16 is a photocoupler which is a signal transmission element for transmitting and receiving which is connected in series with the signal line 4 on the indoor side, respectively, and 11° 18 is a photocoupler which is connected in series with the signal line 4 on the outdoor side. Photocoupler, 19.20U, which is a signal transmission element for trust and reception.These photocouplers 1
This is a communication control circuit that controls 5.16 and 17.18 on the indoor 1 side and the outdoor side, respectively, and is composed of a microcomputer, etc.

Here, to explain the configuration of the indoor unit A in more detail, the anode of a rectifying element (diode) Ia is connected to one pole of the power line 2, and the current limiting resistor 13 is connected to the cathode of the rectifying element (diode) Ia.
The anodes of the photodiodes of the receiving photocoupler 16 on the indoor side are connected in sequence, the cathodes of which are connected to the collectors of the phototransistors of the transmitting photocoupler 15, and the emitters of the photodiodes connected to the internal and external switching signal lines 4. The phototransistor of the coupler 16 is connected to the receiving input I10 port (RXI) of the control circuit 19 such as a 1-chip microcomputer on the indoor side, and the photodiode of the photocoupler 15 is connected to the transmitting output I10 port 'L' of the control circuit 19.
are connected to XI respectively. Further, the communication control circuit 19 manually inputs signals from the operation input changeover switch 2I for turning on the air conditioner, adjusting the 0FF1 temperature, switching between cold and warm, and the indoor air temperature detecting element 8 such as a thermistor.

Further, the configuration of the outdoor unit B is such that the above-mentioned outdoor crossover signal line 4
is connected to the anode of the photodiode of the receiving photocoupler 18 on the outdoor side, its cathode is connected to the collector of the phototransistor of the transmitting photocoupler 11, and its emitter is connected to the rectifier element 1 through the current limiting resistor 14 on the outdoor side.
The anode of 21) is connected to the other pole of the power line 2 opposite to the cathode connected to the inside of the Hill chamber. Then, the phototransistor of the 7 optical coupler 218 is used for reception of the communication control circuit 20 on the outdoor side;
are connected to each other.

Further, the control circuit 20 is connected to an inverter PWM Hasugi generation section 22, and the waveform generation section 22 is further connected to a power transistor module section 24 which receives a power rectification section 23 as an input, and the compressor 3 is energized by this module section 24. It is now possible to do so.

This is a 25r1 outdoor temperature display element. Also, indoor 1li1
1, the anode is connected to the power line 2 symmetrically with the rectifying element 11a.
A rectifying element 11b connected to the electric power m2 is provided, and a rectifying element 12a having a cathode connected to the electric power m2 is provided symmetrically to the outdoor rectifying element 121).

Note that 26 and 27 are synchronization signal generation circuits that generate signals synchronized with the AC power supply l. FIG. 2 shows the actual wiring of the internal and external connecting wires, with the power line 2 fixed to the terminal board 28 and the signal line 4a screwed onto it.

Next, the operation will be explained.

First, as a first operation, a transmission operation from indoors to outdoors in a case where, for example, inverter compressor 30 rotation speed command information is transmitted from the indoor side will be explained. A transmission request signal is sent to the photocoupler 15 from the transmission output port TXI to the communication control circuit 19. At this time, outside the room (IJll's blessing control circuit 1pr20, if reception is possible, photocoupler 1
The photocoupler 17 connected to 8 is turned on. This causes electric current frt, ri from one pole of the power line 2 to be removed from the rectifying element 118 . Resistor 13, photocoupler 16 diode,
It passes through the transistor of the photocoupler 15, the transfer signal side 12, the diode of the photocoupler 18 on the outdoor side, the transistor of the photocoupler 17, and the rectifying element 12k), and returns to the other pole of the power line 2. As a result, a current flows to the photodiode of the indoor photocoupler 16 and lights up, so that the indoor communication control circuit 1
9 itself determines that the transmission request signal has been accepted and starts transmitting the transmission data. In other words, photocoupler 1
The switching control of transistor No. 5 is performed and information is transmitted as a time-division digital signal. Also, outside the room,
The communication control circuit 20 receives the signal from the photocoupler 18 . At this time, if the transmission data includes rotation speed command data for the compressor 3, the data can be sent serially, and if you want to end the transmission, include a code indicating the end of the transmission signal and send it. Circuit 20Ifi is capable of detecting the end of the transmission signal.Next, as a second operation, a description will be given of an operation in which, for example, outdoor temperature detection information is transmitted from the outside of the room and received on the inside of the room.

The desired communication is possible by performing an operation viewed from the outdoor side in the exact opposite direction to the first operation, but as an alternative method, after the transmission of the communication control circuit 19 on the indoor side in the first operation is completed, the photocoupler 15 is turned on continuously. In other words,
By switching the photocoupler 11 with a signal from the transmission output boat TXO of the communication control circuit 20 on the outdoor side, the loop current is output as a time-division transmission signal, the photodiode of the photocoupler I6 blinks, and the communication control circuit 19 can receive the data. By repeating these steps, two-way communication between indoors and outdoors becomes possible. Here, an even more important effect is that even if the rectifying element 12a were to be connected incorrectly and the outdoor power line 2 was connected in reverse, the loop current would flow through the rectifying element 12a instead of the rectifying element 121). Therefore, communication between the inside and outside can be carried out normally. In addition, there is no effect on the inverter drive rectifier 23 at the subsequent stage, and internal and external communication, air conditioning control, pressure miso 3 drive, etc. are normal!
It is self-evident that it works.

In the above example, the communication speed is 1lt.
Since it has no limit, the transmission rate is 11% indoors and outdoors.
The 11 signal control circuits 19 and 20 each decide.

FIG. 3 is a circuit diagram showing another embodiment of the invention. In this system, communication is performed by synchronizing the commercial power source frequency with the source frequency, and a signal waveform synchronized with the commercial AC power source 1 is introduced into the communication control circuit 19 on the indoor side. That is, a full-wave rectified waveform is obtained from the electric power @2 through an isolation transformer 29 and a fully fatigued current flow element 30, and further, the transistor 31 uses the 1& current waveform as a commercial AC synchronizing signal source. FIG. 4 shows the waveform at points A9 and B in FIG. 3. in this way,
Signals synchronized with the commercial AC power source 1 are input to the communication control circuits 19 and 20 on the indoor side and the outdoor side, respectively, and it is advantageous in terms of the configuration that these inputs are respectively input as interrupt signals. To explain the operation, for example, when transmitting from the indoor side as shown in FIG. 5, the transistor of the photocoupler 15 is switched at the rising edge of the synchronizing signal to generate a pulsed digital signal 'Wt''l. The commercial wave passes through the rectifying element 118 and becomes the pulse signal (-'1
synchronous signal waveform to the outdoor photocoupler 15)
It is conveyed as.

At this time, the operation is such that the signal waveform of the photocoupler 17 has a waveform (E).

Communication is performed in this way, and here the rectifying element 11
t)ri It serves to form an internal and external communication current loop in full-wave bipolar directions.

Each of the embodiments has been described above, and as shown in FIG. 2, the signal #Ifj4i is thin and can be distinguished from the others by looking at it, but it is generally recommended to be aware of the polarity of the power line 2. In this embodiment, even if the polarity of the power line 2 is reversed, it has no effect on the operation, and therefore wiring can be carried out as per common sense. Further, in the case of a recent inverter air conditioner as shown in FIG. 6, it is possible to utilize the fact that an inverter's force rectifier 23 is used outdoors and substitute the rectifier elements 12a and 12b. That is, the diode of the rectifier 32 inside the rectifying section 23 is replaced by the rectifying element 12a.

+21), and in this case,
There is no need to use a new rectifying element, which helps reduce costs. This is the rectifying element 11a, llb on the indoor side.
The same can be said for

〔Effect of the invention〕

As clarified above, according to the present invention, 1! The i-stream elements are connected symmetrically in opposite directions, the connection points of each rectifying element are connected with a single signal line, and a signal transmission element inserted in the middle of this signal line is connected between the indoor I11 and the outdoor side. Since the power lines are controlled individually, two-way communication is possible between the indoor and outdoor sides, complex information can be transmitted, and there is no need to consider the polarity of the power line, which improves reliability. This also has the effect of improving workability during construction.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing one embodiment of the present invention, FIG. 2 is a perspective view showing the wiring situation of the crossover wire in FIG. 1, FIG. 3 is a circuit diagram showing another embodiment of the invention, and FIG. Figure 4 is a diagram showing the waveforms at each point in Figure 3, Figure 5 is a waveform diagram to explain the process of generating a signal synchronized with a commercial AC power source, and Figure 6 is a diagram showing the waveforms at each point in Figure 3. FIG. 7 is a circuit diagram showing an applied example, and FIG. 7 is a circuit diagram showing a conventional example. 1......AC power supply 2...'Power line 3...Compressor 4...Signal line I Ia , Ilb, 12a, 12'o... Rectifying element +5.16.17.18... Photocoupler (signal transmission element) 19, 20... Communication control circuit A.・・・・・・
. . . Indoor unit B . . . Outdoor one-rule unit Note that the same reference numerals in the drawings indicate the same or equivalent parts.

Claims (2)

[Claims] (1) In a separate air conditioner that uses two power lines that supply AC power to the compressor and one signal line that transmits control signals as an indoor/outdoor connecting line between the indoor side and the outdoor side, A rectifying element is connected in series between both poles of the power line in the opposite direction, and a rectifying element is connected in the opposite direction between both poles of the power line on the outdoor side, and the connection point of the rectifying element on the indoor side and the rectifying element on the outdoor side are connected in series. The signal line is connected between the connection point of the element so that a signal current flows from one pole of the power line on the indoor side to the other pole of the power line on the outdoor side, and the signal line on the indoor side is connected for transmission and In addition to installing signal transmission elements for reception in series, signal transmission elements for transmission and reception are also installed in series in the signal line on the outdoor side, and these signal transmission elements are connected to the indoor side and outdoor side. 1. A control device for an air conditioner, comprising a communication control circuit that controls each of the air conditioners. (2) The control device for an air conditioner according to claim 1, wherein the communication control circuits for the indoor side and the outdoor side each control each signal transmission element in synchronization with an AC power supply.