JP3425215B2 - Air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indoor / outdoor separation type air conditioner.
About Waki. [0002] [Prior art]FIG.Is disclosed in, for example, Japanese Patent Application Laid-Open No. 57-553.
One of the conventional air conditioners disclosed in
1 is an overall configuration diagram showing an example, where 1 is a compressor, and 2 is an electric motor.
Machine, 3 is an indoor heat exchanger, 4 is an outdoor heat exchanger, 5 is a switch
Valve, 6 is a decompressor, 7 is an indoor blower, 8 is an outdoor blower,
9 is a power supply, 10 is an indoor control circuit, 11 is an outdoor control circuit,
12 is a DC power supply circuit, 17 is a modulation / demodulation circuit, and 19-a, 1
9-b is a connection line. [0003] In FIG.
Unit 1, indoor heat exchanger 3, outdoor heat exchanger 4, switching valve 5
And the decompressor 6 constitutes a refrigeration cycle. The outdoor unit 14 receives the commercial power 9 and supplies
Supply to the source circuit 12. The DC power supply circuit 12
A power supply for the indoor unit 13
DC power is supplied to the control circuit 10. Indoor control circuit 10
The control of the operation stop of the compressor 1 and the indoor
The control of the entire air conditioner such as the control of the blower 7 is performed. Room
The outdoor control circuit 11 controls the outdoor
The machine 14 is controlled. Indoor control circuit 10 and outdoor control circuit
The communication of the path 11 is performed by the modulation / demodulation circuit 1 connected to the connection line 19.
7 and is modulated at a high frequency by the DC power supply of the connection line 19.
This is performed by superimposing the signals. According to this prior art, the indoor unit 13 and the outdoor
Is that the connection line of the machine 14 only needs to be the connection line 19.
is there. [0006] In the prior art described above, the outdoor unit uses a commercial power supply.
Is receiving commercial AC power supply voltage from the
As described in JP-A-56-155326, indoors
The commercial AC voltage is received by the unit and sent to the outdoor unit.
It is also known that it is converted to a stream voltage and sent to indoor units.
ing. [0007] SUMMARY OF THE INVENTION
And a high-voltage AC power supply from the power supply line for the indoor blower
Drive circuit components such as the wind speed switching circuit
It is necessary to increase the size and to keep a sufficient space between parts.
The configuration of the whole circuit becomes large, and high voltage is applied
The entire circuit on an iron plate in case of overheating.
It was necessary to cover it. [0008] Further, in the above prior art, the indoor unit and the
Considerations when an error occurs in communication with the outdoor unit
Communication is not performed, the air
When the condition of the harmony machine becomes uncertain and repairs are performed,
BetweenWas necessary. Further, an indoor unit,Outdoor unitIncorrect connection of connecting wires between
There is a misconnection due to lack of consideration for connection
If the indoor control circuit and the DC power supply circuit break down,
There was a problem. [0010] [0011] [0012]An object of the present invention is to solve such a problem,Room
It can deal with erroneous connection of the connection line between the indoor unit and the outdoor unit.
An object of the present invention is to provide an air conditioner. [0013] [MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
According to the present invention, the commercial AC power is
The power is supplied to the outdoor unit via the connection line, and the outdoor unit
The commercial AC voltage is converted to a DC voltage by a
The indoor unit is supplied via a connection line, and the DC power is supplied to the indoor unit.
The voltage is controlled by the power supply of electrical equipment such as indoor control circuits and indoor blowers.
Pressure. [0014] [0015]AndDC power supply from outdoor unit to indoor unit
Indoor unit against incorrect connection of the second connection line for the supply of pressure
Means for protecting the indoor control circuit. [0016] [0017] [0018] [0019][Action] According to such a configuration, Against incorrect connection
Provide protection circuit in indoor unitBecause it ’s somethingWrong connection wire
When connected, failure of the indoor control circuit or DC power supply circuit
Can be prevented. [0020] Embodiments of the present invention will be described below with reference to the drawings.
You. FIG. 1 shows an embodiment of an air conditioner according to the present invention.
13-a and 13-b show the conversion.
Tuning circuits, 14-a and 14-b are oscillation circuits, and 18 and 19 are
The connection lines are the same as those in FIG.
And duplicate explanations are omitted. In FIG. 1, an indoor unit 13 and an outdoor unit 14
Between them, two connection lines 18 and 19 are provided,
One connecting line 18 is connected to the indoor unit
13 and connected to the DC power supply circuit 12 of the outdoor unit 14.
ing. Therefore, the commercial AC voltage from the commercial power supply 9 is
Is supplied to the outdoor unit 14 through the connection line 18 of the
The voltage is converted into a DC voltage by the circuit 12. The connection line 19 is
The DC power supply circuit 12 in the outdoor unit 14 and the indoor unit 13
Connected to electrical equipment such as the indoor control circuit 10
The DC voltage generated by the DC power supply circuit 12 is
It becomes the power supply voltage of the electric components such as the control circuit 10. Thus, the room provided in the room
Connect the indoor unit directly to the AC outlet for commercial exchange.
Current voltage can be captured, and the prior art shown in FIG.
It is not necessary to provide a wiring outside the room as in the above. The indoor blower 7 of the indoor unit 13 and the indoor blower 7
The power supply voltage of an electric device such as the control circuit 10 is an outdoor unit.
14 from the DC power supply circuit 12 via a connection line 19.
DC voltage, and consider the maximum voltage required for these electrical products.
The voltage can be as low as about 35V. This
If a low DC voltage is used as the power supply voltage, the indoor unit 13
Electrical components do not require large components for high voltage,
Since there is no danger of heat ignition, the wind of the indoor blower 7
Covering the speed switching drive circuit with an iron plate
It becomes unnecessary. The power supply to the indoor units
Compared with the DC voltage, the peak value can be smaller than
The insulation distance of the board pattern etc. can be reduced, and the danger of ignition
Small wind speed switching drive circuit, etc. due to low ruggedness
it can. In the case of AC voltage, the peak value is 2 of the square root of the effective value.
In the case of DC, the peak value and the effective value are equal.
Generally, there is no danger of ignition at AC voltage below 30V
On the other hand, there is no danger of ignition at DC voltage of 42 V or less.
No. If the wind speed switching drive circuit can be downsized,
The room unit 13 has enough space, and parts and devices
Can be added to make the air conditioner multifunctional.
For example, additional devices include deodorizing devices and valves.
When adding a two-way valve, for example, indoor heat exchange
The heat exchanger is divided into two parts, which are connected via a two-way valve.
And, if necessary, replace one indoor heat exchanger with a reheater,
The indoor heat exchanger is operated as a cooler, and the dehumidified warm
It has a function to send air into the room.
Can be. A DC motor is used as the indoor blower 7.
Used and controlled by the indoor control circuit 10.
DC motors have a lower voltage than AC motors.
Can be controlled without stopping due to insufficient torque. The connection line 19 is connected to the indoor control circuit 10.
It is also used for communication of information with the outdoor control circuit 11.
For this reason, the indoor unit 13 has a connection line 19 connected to the oscillation circuit 14.
The modem 17-a to which the output signal of -a is supplied is connected.
The modulation and demodulation circuit 17-a and the indoor control circuit 1
An information signal is exchanged with 0. Outdoor unit 1
4soSimilarly, the output of the oscillation circuit 14-b is connected to the connection line 19.
A modem 17-b to which a signal is supplied is connected.
Information communication between the modem 17-b and the outdoor control circuit 11
The exchange of issues is performed. Information signal output from indoor control circuit 10
Is the DC power on the connection line 19 by the modulation / demodulation circuit 17-a.
The pressure is modulated and transmitted to the outdoor unit 14, where the outdoor unit 14
This information is demodulated by the demodulation circuit 17-b, and is output to the outdoor control circuit.
11 is supplied. Also, the output from the outdoor control circuit 11 is output.
The transmitted information signal is connected by the modem 17-b.
The DC voltage on the connection line 19 is modulated and transmitted to the indoor unit 13.
In the indoor unit 13, this information is decoded by the demodulation circuit 17-a.
And supplied to the indoor control circuit 10. Here, the outdoor control circuit is sent from the indoor control circuit 10.
The information signal transmitted to the road 11 is based on the conventional air conditioner described above.
Similarly to the control information, the control information for controlling the outdoor unit 14 is provided.
Supplied from the outdoor control circuit 11 to the indoor control circuit 10.
The information signal is a response to the control information from the indoor unit 13.
The information includes information indicating the state of each unit of the outdoor unit 14 and the like. As described above, in this embodiment, the above-described conventional empty space is used.
With the same number of control lines as the air conditioner,
Receiving the AC voltage, the quotient between the indoor unit 13 and the outdoor unit 14
AC voltage and DC voltage transmission for indoor control circuit 10, room
Communication of information between external control circuits 11
You. FIG. 2 shows the modulation and demodulation circuits 17-a, 17 in FIG.
FIG. 9 is a circuit diagram specifically showing a connection relationship of −b to the connection line 19.
19-a, 19-b are electric wires, 21-a, 21-
b is a capacitor, 22-a and 22-b are inductors.
And the parts corresponding to those in FIG.
Description is omitted. In the figure, a connecting wire 19 is composed of two electric wires 1.
9-a and 19-b, and one of the wires 19-b is
groundHave been. The modulation / demodulation circuit 17-a of the indoor unit 13 is
Connected to the transmission terminal and the reception terminal of the internal control circuit 10.
And a DC blocking capacitor 21-a
ThroughgroundConnected to the other wire 19-a
I have. Further, a capacitor 21-a is connected to the electric wire 19-a.
Between the connection point between the cable and the electric wire 19-a and the indoor control circuit 10
Is provided with an inductor 22-a for blocking a transmission signal.
I have. Similarly, the modulation / demodulation circuit 17-b on the outdoor unit 14 side
Is connected to the transmission terminal and the reception terminal of the indoor control circuit 11.
And a capacitor 21-
via bgroundConnected to the other wire 19-a.
Have been. Furthermore, the capacitor 21 is connected to the electric wire 19-a.
-B and the connection point between the electric wire 19-a and the DC power supply circuit 12
In between, an inductor 22-b for blocking a transmission signal is provided.
ing. Next, the operation of this specific example will be described with reference to FIG.
This will be described with reference to FIG. As mentioned above, DC
The DC voltage generated by the power supply circuit 12 corresponds to the electric wires 19-a, 1
9-b, the indoor control circuit 10, the indoor blower 7, etc.
The power is supplied to the indoor unit 13 as a power supply voltage. At this time,
This DC voltage is modulated and demodulated by the capacitor 21-b.
7-b is prevented from being supplied to
1-a supplies this DC voltage to the modulation / demodulation circuit 17-a.
Is prevented from being fed. Therefore, this DC voltage
The power supply voltage is supplied to the internal control circuit 10 and the indoor blower 7, etc.
Be paid. Now, from the transmission terminal of the indoor control circuit 10,
When a transmission information signal as shown in FIG.
Is supplied to the modulation / demodulation circuit 17-a, and the transmission information signal of FIG.
The carrier wave from the oscillation circuit 14-a as shown in FIG.
Adjust. This carrier has a frequency sufficiently higher than the transmitted information signal.
This is a number signal. The resulting modulated signal is
The electric power is supplied to the electric wire 19-a via the
It is superimposed on the DC voltage from the power supply circuit 12. This
The transmission information signal is sent to the outdoor unit 14 via the electric wire 19-a.
Supplied. The transmission information from the modem 17-a
The signal is transmitted to the indoor control circuit 10 by the inductor 22-a.
And to the indoor blower 7 etc.
Only pressure is supplied to the indoor control circuit 10, the indoor blower 7, etc.
It is. Here, the modem 19-a sends the electric wire 19
The amplitude value of the transmission information signal supplied to -a
Is set smaller than the DC voltage value of
Thus, as shown in FIG. 3C, the DC voltage is
No interruptions due to traffic lights. Therefore, the indoor control circuit
Power is sufficiently supplied to the road 10 and the indoor blower 7
become. Transmission information transmitted via the electric wire 19-a
The signal is output from the outdoor unit 14 by the capacitor 21-b.
And is extracted and separated from the DC voltage.
-B, demodulated and received as shown in FIG.
Supplied from the receiving terminal to the outdoor control circuit 11 as a communication information signal
Is done. As described above, from the indoor unit 13 to the outdoor unit 14
Is communicated. The communication from the outdoor unit 14 to the indoor unit 13 is the same.
As shown in FIG. 3B from the oscillation circuit 14-b,
Such a carrier is transmitted to the outdoor control circuit 11 by the modulation / demodulation circuit 17-b.
Transmission information output from the transmission terminal as shown in FIG.
And modulated via the capacitor 21-b.
As shown in FIG.
3 is transmitted. In the indoor unit 13, only this transmission signal
It is extracted by the capacitor 21-a and is extracted by the modulation / demodulation circuit 17-a.
The signal is demodulated as shown in FIG.
Supplied from the receiving terminal. In this way, one connection line 19
The DC power supply voltage from the DC power supply circuit 12 to the indoor unit 13
Between the indoor control circuit 10 and the outdoor control circuit 11
Information communication. FIG. 4 shows a modulation / demodulation circuit 17-a,
One of the modulation section and the oscillation circuits 14-a and 14-b at 17-b
It is a circuit diagram showing a specific example. Here, the modem 17
-A and 17-b and the oscillation circuits 14-a and 14-b have the same configuration.
The modulation / demodulation circuit 17-a and the oscillation circuit 1
4-a will be described. In the figure, resistors R16 to R20 and capacitors
Oscillator circuit 14- composed of capacitor C06 and voltage comparator COM2
a is constituted. Output signal of this oscillation circuit 14-a
Are increased by the transistors Q3 and Q4 so as to have the above amplitude.
And supplied to the electric wire 19-a via the capacitor 21-a.
Be paid. Input terminal 15-a is normally set to high level
The transistor Q2 is turned on and the capacitor C
06 is short-circuited. This stops the oscillation circuit
ing. Transmission information signal is input terminal as low level signal
15-a, and turns off the transistor Q2.
You. As a result, the oscillation circuit generates a carrier wave. That is,
The carrier wave is generated during the period of the low-level transmission information signal.
Transmission signal modulated by the transmission information signal
Obtained from Q4. FIG. 5 shows the modulation / demodulation circuits 17-a, 17-a in FIG.
At 17-bDemodulation unitFIG. 3 is a circuit diagram showing one specific example. This
Here, the modulation and demodulation circuits 17-a and 17-b have the same configuration.
Therefore, the modulation / demodulation circuit 17-a will be described. In the figure, extraction is performed by the capacitor 21-a.
The transmitted transmission information signal is supplied to the voltage comparator COM1,
This is compared with a reference voltage determined by the resistors R05 and R06. Carrying
When the transmission information signal that modulates the transmission is not sent
Means that the input voltage of the voltage comparator COM1 is lower than the reference voltage.
In addition, the output voltage of the voltage comparator COM1 is zero. to this
When a transmission information signal is sent,
Since the transmission amplitude is higher than the reference voltage, the voltage comparator CO
M1 outputs a signal of this carrier frequency. Electric
This output signal of the pressure comparator COM1 is connected to the diode D and the capacitor.
The current is rectified and smoothed by the capacitor C03 and the transistor Q1 is driven.
Move. Thereby, the reception information signal is output from the output terminal 16-a.
No. is obtained. This received information signal is transmitted to the indoor control circuit shown in FIG.
It is supplied to the receiving terminal of the path 10. As described above, in this embodiment, the DC voltage
Is not interrupted by transmission signals,
Power from the outdoor unit 13
The DC power supply circuit 12 provided in the outdoor unit 14
And the power supplied to the indoor unit 13 can be reduced.
The airflow of the indoor blower 7 can be prevented from decreasing.
Can be. In the above embodiment, the commercial power supply voltage is
Although the internal unit 13 receives power, the outdoor unit 14 receives power.
You can also make it. In this case, the outdoor unit 14
If one or more indoor units 13 are connected to
The connection line 18 for the source voltage becomes unnecessary, and the DC voltage is transmitted.
Connection line19Supply of power supply voltage to indoor unit 13 and indoor
Communication between the control circuit 10 and the outdoor control circuit 11 becomes possible.
Therefore, only two connection lines are required. As described above, the commercial power supply voltage is
For indoor and outdoor air conditioners that receive power, the outdoor unit and the indoor unit
The feature is that only two connection lines are required between the machine and the machine. FIG. 6 shows an embodiment of an air conditioner according to the present invention.
FIG. 2 is a block diagram showing a portion corresponding to FIG.
Are denoted by the same reference numerals, and redundant description is omitted. [0049] In FIG.
9 and the indoor control circuit 10, a modem 17-a is connected.
In the outdoor unit 14, the connection line 19 and the outdoor control circuit 1 are connected.
The modulation / demodulation circuit 17-b is connected between the first and second circuits. Indoor
controlcircuitThe transmission information signal output from 10 is modulated and demodulated.
The path 17-a modulates the DC voltage on the connection line 19
The transmission information is transmitted to the outdoor unit 14, and the transmission information is transmitted to the outdoor unit 14.
The signal is demodulated by the demodulation circuit 17-b and the outdoor control circuit 11
Supplied to In addition, output from the outdoor control circuit 11
The transmission information signal is transmitted to the connection line 1 by the modem 17-b.
9 is transmitted to the indoor unit 13 after being modulated.
In the transmitter 13, the transmission information signal is converted by the modulation / demodulation circuit 17-a.
The signal is demodulated and supplied to the indoor control circuit 10. As described above, in this embodiment, the transmission information signal
The signal modulates the DC voltage to produce a chamber for this information signal.
Communication between the indoor control circuit 10 and the outdoor control circuit 11 is performed.
Also, in this embodiment, the same as the above-described conventional air conditioner is used.
Of the commercial AC voltage from the indoor unit 13
Receiving electric power, the commercial AC voltage between the indoor unit 13 and the outdoor unit 14
DC voltage transmission, indoor control circuit 10, outdoor control circuit 1
1 can communicate information. FIG. 7 shows the modulation / demodulation circuits 17-a and 17-17 in FIG.
19 is a circuit diagram showing a specific example of -b, 19-a and 19-b.
-B is an electric wire, 20-a and 20-b are transformers, 21-
a, 21-b are capacitors, 22-a, 22-b are capacitors.
Dacta, 23-a1, 23-a2, 23-a3, 23-
b1, 23-b2 and 23-b3 are windings, and FIG.
Corresponding parts have the same reference characters allotted and redundant description will be omitted.
You. In the figure, the modulation / demodulation circuit 1 of the indoor unit 13
7-a is a transformer 20-a and a DC blocking capacitor
21-a and an inductor 22- for increasing impedance
a. Indoor control circuit 10, DC power supply circuit
The connection line 19 between the two 12 is two electric wires 19-a, 19-b
And one of the windings 23-a1 in the transformer 20-a.
The terminal is directly connected to the electric wire 19-b, and the other terminal is connected to the capacitor 2
1-a are connected to the electric wires 19-a, respectively. Ma
Further, the winding 23-a2 of the transformer 20-a is an indoor control circuit.
10 is connected to the winding 23-a3 of the transformer 20-a.
Are connected to the reception terminals of the indoor control circuit 10, respectively.
Furthermore, the electric wire 19-a has a capacitor 21-a and an electric wire.
Between the connection point 19-a and the indoor control circuit 10.
A ductor 22-a is provided. Similarly, the modulation / demodulation circuit 1 on the outdoor unit 14 side
7-b is a transformer 20-b and a DC blocking capacitor
21-b and an inductor 22- for increasing impedance
b. Winding 23- in transformer 20-b
One terminal of b1 is directly connected to the electric wire 19-b, and the other terminal is connected to
Each is connected to the electric wire 19-a via the capacitor 21-b.
Have been. The winding 23-b2 of the transformer 20-b is
The transformer 20-b is wound around the transmission terminal of the outdoor control circuit 11.
Lines 23-b3 are connected to the receiving terminals of the outdoor control circuit 11, respectively.
Have been. Further, the capacitor 2 is connected to the electric wire 19-a.
1-b and the connection point between the electric wire 19-a and the DC power supply circuit 12
The inductor 22-b is provided therebetween. Next, the operation of this specific example will be described with reference to FIG.
This will be described with reference to FIG. As mentioned above, DC
The DC voltage generated by the power supply circuit 12 corresponds to the electric wires 19-a, 1
The signal is supplied to the indoor control circuit 10 via 9-b. This and
When this DC voltage is transmitted by the capacitor 21-b,
Supply to the power supply 20-b, and
This DC voltage is supplied to the transformer 20-a by the
It is prevented from being supplied. Therefore, this DC voltage is
The power is supplied to the indoor control circuit 10 and the like as a power supply voltage. Now, from the transmission terminal of the indoor control circuit 10,
Transmission information signal having positive and negative levels as shown in FIG.
Is output, the transmission information signal is transmitted to the transformer 20-a.
Through the windings 23-a2 and 23-a1 of the electric wires 19-a,
19-b, and as shown in FIG.
The pressure is modulated and transmitted to the transformer 20-b. This and
To increase the impedance of the inductor 22-a.
Thus, the transmission information signal is transmitted to the indoor control circuit 10.
Is blocked. In the transformer 20-b, the transmission information signal
The modulated DC voltage is transmitted by the capacitor 21-b.
Only the communication information signal is extracted (FIG. 8 (c)).
Outdoor control via 0-b windings 23-b1, 23-b3
The signal is received at the receiving terminal of the circuit 11. At this time,
The transmission information is increased by the impedance-up effect of the
Signal is prevented from being transmitted to the DC power supply circuit 12.
You. Similarly, the transmission terminal of the outdoor control circuit 11
Is transmitted from the transformer 20-b.
Wires 23-b2, 23-b1, wires 19-a, 19-b,
Via the windings 23-a1, 23-a3 of the transformer 20-a
Is sent to the reception terminal of the indoor control circuit 10. in this case
Are transmitted by the inductors 22-a and 22-b.
Is supplied to the indoor control circuit 10 and the DC power supply circuit 12
Is prevented. In this way, one connection line 19
And the indoor control circuit 1 of the indoor unit 13 from the DC power supply circuit 12.
Supply of the DC power supply voltage to the power supply 0 and the like, and the indoor control circuit 10
Information communication with the outdoor control circuit 11 becomes possible. FIG. 9 shows another embodiment of the air conditioner according to the present invention.
It is a block diagram showing an example, 20 is a display circuit,
Parts corresponding to those in FIG.
Is omitted. In the figure, connection line 19 and modulation / demodulation circuit 1
Indoor control circuit 10 and outdoor control via 7-a, 17-b
Your circuit11During communication with the
(The time differs depending on the contents, etc.)
And the indoor control circuit 10 and the outdoor control circuit11Is this
Is determined to be abnormal in the communication circuit, and the indoor unit 13 and the outdoor unit 1
4. In other words, stop the operation of the air conditioner and
The control circuit 10 drives the display device 20 to display a fault.
Let me know. Examples of such a failure display include a display device.
For example, the indoor unit 13 of the air conditioner
Use the display device provided, and use this for other than normal display
Display method (for example, blinking)
No. Thus, it is possible to easily know the communication abnormality.
And promptly take measures such as repairs.
Can be. FIG. 10 shows an air conditioner according to the present invention.
FIG. 14 is a block diagram showing another embodiment, wherein reference numeral 21 denotes a cutoff circuit.
The parts corresponding to those in FIG.
The description of the operation will be omitted. In the figure, a DC power supply is connected to the outdoor unit 14 side.
An interruption circuit 21 for interrupting the DC voltage from the path 12 is provided.
Have been. This shutoff circuit 21 is controlled by the outdoor control circuit 11.
The outdoor control circuit 11 determines that the communication circuit is abnormal.
Then, while stopping the air conditioner, the shutoff circuit 2
1 to cut off the supply of the DC voltage to the indoor unit 13
You. According to this, the failure of the indoor unit 13
Can be protected electrically. The cutoff circuit 21 is connected in series with the connection line.
It can be composed of connected relays and semiconductor switches.
it can. FIG. 11 shows an air conditioner according to the present invention.
FIG. 14 is a block diagram showing another embodiment, in which 22 is a
The same reference numerals are assigned to portions corresponding to FIG.
A duplicate description will be omitted. In the figure, the indoor unit 13 has a connection line 1
The diode 22 is connected between 9-a and 19-b.
You. Here, the diode 22 has an anode connected to the connection line 1.
9-b, the cathodes are respectively connected to the connection lines 19-a.
You. Therefore, the connection line 19-a is connected to the + side of the DC voltage,
The connection line 19 is positive so that 19-b is on the negative side of the DC voltage.
Reverse voltage is applied to the diode 22
Is turned off, and the DC power supply circuit 12
3 is normally supplied with a DC voltage. However, the connection line 19-a is incorrectly
The anode 22 of the diode 22 and the connection line 19-b
Is connected to the indoor unit 13 so as to be on the cathode side of
Assuming that the DC voltage is
Is applied to turn on the diode 22. Because of this,
Overcurrent flows through the DC power supply circuit 12 and
The overcurrent protection circuit operates and stops the DC voltage supply.
You. As a result, the indoor control circuit 10 protects against overcurrent.
Protected. The DC power supply circuit 12 has an overcurrent protection circuit.
If no is provided, as shown in FIG.
At least one of the connection lines 19-a and 19-b has a current hue.
To prevent overcurrent due to incorrect connection of the connection line 19.
When it comes off, the current fuse 23 blows and the indoor unit 13
Cut off the supply of DC voltage. This allows
The indoor control circuit 10 is protected against electric current. In the embodiment shown in FIGS. 11 and 12,
DC power supply by diode 22 and current fuse 23
There is no voltage drop or loss, and the capacity of the DC power supply circuit is reduced.
The temperature rise of the indoor control circuit 10 can be reduced. FIG. 13 shows the embodiment described above in more detail.
Is a block diagram shown in FIG.
102 is an indoor control microcomputer, 103 is a thermistor circuit,
104 is a wireless remote control, 105 is a wireless reception
Circuit, 106 is a buzzer circuit, 107 is a vertical
108, a reset circuit, 109 is an indoor control circuit,
10 is an indoor blower drive circuit, 201 is an electromagnetic contactor, 20
2 is a power supply circuit, 203 is a power module, 204 is a room
External control microcomputer, 205 is a position detection circuit, 206 beats
Path, 207 is a power supply control circuit, 208 is a switching valve drive circuit,
209 is an outdoor blower drive circuit, 210 is a thermistor circuit
Path, 211 is a display circuit, 212 is a reset circuit,
Parts corresponding to the above-mentioned drawings are denoted by the same reference numerals. Referring to FIG.
And via the power switch 101, the connection line 18
To the outdoor unit 14. The power switch 101
A switch for the entire air conditioner,
It is turned off when not in use. The above-mentioned indoor control circuit 10 is used for the indoor control microcomputer.
The configuration is centered on the component 102. Indoor control microcomputer 1
02 is room temperature data detected by the thermistor circuit 103
Take in. User by wireless remote control 104
Set the set temperature, operation mode, wind speed, etc.
The setting signal from the remote control 104 is
Received by the communication circuit 105 and supplied to the indoor control microcomputer 102.
Be paid. The indoor control microcomputer 102 is a thermistor circuit 1
03 and the pressure corresponding to the difference between the room temperature and the set temperature
The ON / OFF signal of the compressor 1 (FIG. 6) and the rotational speed command signal
Calculate and create The buzzer circuit 106 is a wireless remote control
When a signal is received from 104, a confirmation tone is generated. table
The indicating circuit 20 usually indicates the operating state of the air conditioner.
Operation, such as by operating lamps or dehumidifying ramps.
It is configured. The direction of the wind blown out of the air conditioner
Up and down to move the up-down direction board (not shown)
A wind direction plate motor 107 is provided. Also reset
The circuit 108 controls the indoor control microcomputer 102 when the power is turned on.
And a reset signal. Power is supplied to the outdoor unit 14 via the connection line 18.
The commercial AC voltage is supplied to the switching valve 5, outdoor blower 8, DC power supply
A power supply circuit 202 via a path 12 and an electromagnetic contactor 201,
The power is supplied to the power module 203. Electromagnetic contactor 20
1 turns on when the compressor 1 operates, and turns off when the compressor 1 is stopped.
This shuts off the power. The power supply circuit 202 is a commercial AC
The voltage is rectified and smoothed to form a high DC voltage. Power
-Module 203 consists of six switching elements
The DC voltage is switched to
The electric power is supplied to the electric motor 2 for driving the contractor. The above outdoor control circuit 11 is an outdoor control microcomputer.
The main part 204 is mainly configured. Outdoor microcomputer 204
Is to drive the electric motor 2. here
Uses a DC brushless motor as the electric motor 2
You. DC brushless motor has high efficiency and excellent controllability
However, it detects the magnetic pole position of the rotor.
Need to be In this rotor position arrangement detection circuit 205,
Is detected and calculated by the outdoor control microcomputer 204, and
Signal for switching the power module 203
It is formed. The driving circuit 206 is an outdoor control microcomputer 204
Amplifies the signal output from the power module 203
Is to be driven. Also, the current limiting circuit 207
Power source circuit 202, power module 203, etc.
Detecting the current to control the current flowing through the motor 3,
Power module 203 so that excessive current does not flow.
Protection. The switching valve 5 and the outdoor blower 8 are connected to an outdoor control
The switching valve drive circuit 208 and the chamber
It is driven by an external blower drive circuit 209. The thermistor circuit 210 of the outdoor heat exchanger 4
Detects temperature, outside air temperature, temperature of compressor 1, etc.
One rotation speed control is performed. The display circuit 211 is in the operating state or tripped.
Display the cause of the stop at the time of
What do you do? The reset circuit 212 is connected to the outdoor control microcomputer 2
04 reset control is performed. The commercial AC voltage is supplied to the DC power supply circuit of the outdoor unit 14.
12 is supplied. This DC power supply circuit 12 includes an indoor unit 13
A DC voltage of a voltage to be supplied to the DC power supply is formed. Outdoor control circuit
The power supply voltage used in 11 is created by the DC power supply circuit 12
Alternatively, another power supply circuit may be provided. DC voltage generated by DC power supply circuit 12
Is supplied to the indoor unit 13 via the connection line 19. Room
The internal control circuit power supply 109 is connected to the direct power supplied from the outdoor unit 14.
The power supply voltage used in the indoor control circuit 10 is
Form. The indoor blower driving circuit 110 includes the outdoor unit 14
The indoor blower 7 is driven by the DC voltage supplied from the
Voltage. DC blower as the indoor blower 7
Motor is used and the indoor control microcomputer 102
By controlling the drive voltage with these commands,
The air volume of the blower 7 can be controlled. Also, the air blower 7
When a large current flows, the indoor blower driving circuit 110
A signal is sent to the indoor control microcomputer 102, thereby
Inside control microcomputer 102 is indoorBlower7 is stopped. The indoor control microcomputer 102 and the outdoor control microcomputer
The communication with the component 204 is performed by the modulation / demodulation circuits 17-a, 17-
b and the connection line 19. Modulation / demodulation circuit 17-
a is connected to the connection line 19 and the indoor control microcomputer 1
02 on the connection line 19 according to the transmission signal output from the
By modulating the voltage at a high frequency, the transmitted signal is
Superimposed on the flowing voltage. The modulation / demodulation circuit 17-b is connected to the connection line 19
High-frequency signal is detected from the DC voltage of the outdoor control microcomputer
204. Indoor control from outdoor control microcomputer 204
The same applies when communicating with the control microcomputer 102. In this communication method, two-way simultaneous communication
Since communication is not possible, communication is performed alternately. The content of the communication is
ON / OFF signal of compressor 1, rotation speed signal, outdoor blower 8
Instructions. In addition, the outside air temperature and the
It also communicates information on the cause of the loop. The communication uses the above data in a predetermined unit (embodiment
In this case, it is divided into 8 bits. 8-bit data
Start and stop bits are added to the
In addition, there is a leader section as a whole. Communication is continuous and alternating
But communication stops or the above bits are incorrect.
If data cannot be read, etc., it is determined that a communication error has occurred.
I do. The initiative of communication is held by the outdoor control circuit 11.
The communication abnormality is determined by the outdoor control circuit 11.
You. As for communication abnormality, indoor control is performed by the outdoor control circuit 11.
Even if communication is performed with the circuit 10,
If there is no answer, incorrect data from the indoor control circuit 10
There are two cases: receiving the message. In the former case, FIG.
As shown in FIG. 4 (a), the indoor control circuit 10
If there is no response, it is determined that communication is abnormal.
As shown in FIG. 14 (b), whether the received data is correct or not is detected.
Then, when the data is incorrect, it is determined that the communication is abnormal. Or
Such data errors are defined as start bit and stop bit.
Whether the reader has a regular waveform or not.
Can be determined based on whether or not they match. This
In the case of
Or if the number of data errors is equal to or
Data is incorrect. In any case, the communication failure occurs for a predetermined time.
Alternatively, when a predetermined number of times are continued, it is determined that the communication is abnormal. [0088] As described above, according to the present invention,
Since the indoor unit is operated with a low DC power supply voltage,
No need for large parts for high voltage in the blower drive circuit
And there is no danger of overheating and ignition.
The need for an iron plate cover for heat ignition protection is eliminated,
Can be downsized. In addition, the blower of the outdoor unit, etc.
Driving with a DC power supply has the same effect as an indoor unit
Needless to say. [0089] [0090] [0091] [0092]AndEven if connection wires are incorrectly connected,
Control circuit can be prevented from being destroyed, and protection for this
No DC power supply voltage drop or loss
The circuit capacity can be reduced, and the temperature of the indoor control circuit rises.
Can also be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing one embodiment of an air conditioner according to the present invention. FIG. 2 is a block diagram showing the connection relationship between the modem and the connection lines in FIG. 1 in more detail; FIG. 3 is a waveform chart showing signals of respective units in FIG. 2; FIG. 4 is a circuit diagram showing a specific example of a modulation unit and an oscillation circuit of the modulation / demodulation circuit in FIG. FIG. 5 is a circuit diagram illustrating a specific example of a demodulation unit of the modulation / demodulation circuit in FIG. 1; FIG. 6 is a block diagram showing another embodiment of the air conditioner according to the present invention. FIG. 7 is a circuit diagram showing a specific example of the modulation / demodulation circuit in FIG. 6; FIG. 8 is a waveform chart showing signals of respective units in FIG. 7; FIG. 9 is a block diagram showing still another embodiment of the air conditioner according to the present invention. FIG. 10 is a block diagram showing still another embodiment of the air conditioner according to the present invention. FIG. 11 is a block diagram showing still another embodiment of the air conditioner according to the present invention. FIG. 12 is a block diagram showing still another embodiment of the air conditioner according to the present invention. FIG. 13 is a block diagram more specifically showing the embodiment shown in FIGS. 6, 9 to 12; FIG. 14 is a flowchart illustrating a specific example of a communication abnormality determination method. FIG. 15 is a block diagram illustrating an example of a conventional air conditioner. [Description of Signs] 1 Compressor 2 Electric motor 3 Indoor heat exchanger 4 Outdoor heat exchanger 5 Switching valve 6 Pressure reducer 7 Indoor blower 8 Outdoor blower 9 Commercial power supply 10 Indoor control circuit 11 Outdoor control circuit 12 DC power supply circuit 13 Indoor unit 14 Outdoor units 14-a, 14-b Oscillation circuits 17-a, 17-b Modulation / demodulation circuits 18, 19 Connection line 20 Display circuit 21 Cutoff circuit 22 Diode 23 Current fuse

──────────────────────────────────────────────────続 き Continuing on the front page (31) Priority claim number Japanese Patent Application No. 5-223072 (32) Priority date September 8, 1993 (9.8.9.8) (33) Priority claim country Japan (JP) (72) Inventor Satoshi Ono 709 Tomita, Odamachi, Ohira-machi, Shimotsuga-gun, Tochigi Prefecture Within Hitachi Tochigi Electronics Co., Ltd. In-Business Department (72) Inventor Hiroyuki Shono 800, Tomita, Oda-machi, Ohira-cho, Shimotsuga-gun, Tochigi Prefecture Living Equipment Hitachi, Ltd. Within business division (72) Inventor Tomoya Hosoya Hitachi Tochigi Co., Ltd. 709 Tomita, Ohira-cho, Shimotsuga-gun, Tochigi (56) References JP-A-58-108948 (JP, A) JP-A-57-55314 (JP, A) JP-A-56-155326 (JP, A) JP-A-6-341700 (JP, A) A) JP-A-6-319171 (JP, A) JP-A-6-14617 (JP, A) JP-A-6-2930 (JP, A) JP-A-4-106350 (JP, A) −68759 (JP, U) Actually open 57-88347 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24F 11/02 103

Claims (1)

(57) [Claims] [Claim 1] An indoor unit that is provided with electric devices such as an indoor control circuit and an indoor blower and receives a commercial power supply voltage, and an electric device such as a compressor, an indoor control circuit, and a DC power circuit. And a commercial power supply voltage received by the indoor unit is supplied to the outdoor unit via the first connection line, and the DC power is supplied to the outdoor unit via the first connection line. The air conditioner is converted to a DC voltage by a power supply circuit, and the DC voltage is supplied to the indoor unit via the second connection line and is used as a power supply voltage for the various electric components of the indoor unit . The connection line is composed of two electric wires, and as means for protecting the indoor control circuit of the indoor unit against erroneous connection of the second connection line, the second connection line of the second connection line is provided on the indoor unit side. Between the wires
When the second connection line is incorrectly connected, the power supply voltage
A diode connected thereto so as to be turned on, and a current flowing through the second connection line when the diode is turned on
Detecting an overcurrent and detecting the indoor unit via the second connection line;
Means for stopping supply of power supply voltage to the air conditioner.