JPH07286746A - Air conditioner - Google Patents

Abstract

PURPOSE:To detect and display a voltage error at a commercial AC power source for an air conditioner at the conditioner side. CONSTITUTION:When a power is applied to an air conditioner by inserting a plug 1 into a plug socket, a detection signal of high or low level responsive to a voltage level (100V or 200V) of an AC power source is input from an input voltage detector 24 to a microcomputer 5. Correct or incorrect of the input voltage is decided by comparing the detection signal with capacity data intrinsic for an air conditioner. If a voltage error exists at the input AC power, an operation lamp 11a of an indoor unit is caused to fleshs to inform an air conditioner installing operator of the fact.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for indoor air conditioning.

[0002]

2. Description of the Related Art Electric wiring generally called single-phase three-wire system is provided in a building such as an independent house or an apartment house. This single-phase three-wire type electrical wiring is composed of a neutral wire and two 100V wires. One of the 100V wires and the neutral wire supplies a single-phase 100V AC power, and two 100V wires. Single-phase 200V AC power can be selectively obtained.

The above-mentioned electric wiring is entrusted to a contractor other than the contractor, and the contractor refers to the drawings, materials, etc. provided by the contractor, for household appliances installed in the building, such as air conditioning. The wiring is so that the AC power necessary for the machine can be supplied to an outlet near the indoor unit installation position.

[0004]

By the way, there are AC100V and AC200V air conditioners, including single type and multi type, depending on their capabilities. Depending on which one of the alternating current powers is supplied.

However, the above-mentioned electric wiring is erroneous in voltage due to a mistake in information transmission between traders or a rudimentary wiring mistake, that is, AC200V and AC200V are supplied to an outlet to which AC100V should be supplied. An error may occur such that AC100V is supplied to an appropriate outlet.

The conventional air conditioner does not have a function of detecting the above-mentioned voltage error by itself, and the application of an overvoltage can only be dealt with by breaking a fuse or a varistor. Since fuses, varistors, etc. are damaged even when a failure occurs in the air conditioner itself, after all, even if the cause of the failure is a wrong voltage, it takes time and labor to discover it. is there.

The present invention has been made in view of the above problems, and an object thereof is to provide an air conditioner capable of detecting and displaying a voltage error in a commercial AC power supply for an air conditioner on the air conditioner side. It is in.

[0008]

In order to achieve the above object, in an air conditioner equipped with either an electric device compatible with AC 100V or an electric device compatible with AC 200V, an AC voltage supplied from a commercial AC power source. Based on the input voltage detection means for outputting a detection signal corresponding to either AC100V or AC200V, and whether or not the alternating current corresponds to the electric device based on the detection signal and the mounted electric device. It is provided with an input voltage determining means for making a determination and outputting the determination signal, and a display means for displaying at least that the alternating current does not correspond to the electric device based on the determination signal.

Further, in an air conditioner equipped with either an electric device compatible with 100 V AC or an electric device compatible with 200 V AC based on rated capacity, AC 100 V or A based on the AC voltage supplied from a commercial AC power source.
The AC corresponds to the electric device based on the input voltage detection means that outputs a detection signal corresponding to any of C200V and the value of the rated capacity stored in advance in the storage unit of the air conditioner. And an input voltage determining means for determining whether or not the output is present, and a display means for displaying at least that the alternating current does not correspond to the electric device based on the determining signal. is there.

Further, in an air conditioner equipped with either an electric device compatible with 100 V AC or an electric device compatible with 200 V AC based on the rated capacity, AC 100 V or A based on the AC voltage supplied from the commercial AC power source.
The AC corresponds to the electric device based on the input voltage detection means that outputs a detection signal corresponding to any of C200V and the value of the rated capacity stored in advance in the storage unit of the air conditioner. Input voltage determining means for determining whether or not the output is performed, and at least the alternating current does not correspond to the electric device on the basis of the determination signal on the display section showing the operating state of the air conditioner. And an abnormality display means for displaying.

[0011]

According to the first aspect of the invention, when power is supplied to the air conditioner by inserting a plug into an outlet or the like, the input voltage detection means outputs detection signals corresponding to AC100V and AC200V, respectively. The input voltage determination means determines the correctness of the input voltage by comparing the input voltage with the electric device mounted on the air conditioner. Then, based on the determination signal output from the input voltage determination means, at least the input voltage error is displayed on the display means, thereby notifying the air conditioner installer of the voltage error in the commercial AC power supply.

According to the second aspect of the present invention, the input voltage determining means determines whether the input voltage is correct or false based on the rated capacity value stored in advance in the storage unit of the air conditioner.

According to the third aspect of the invention, when there is an error in the input voltage, it is displayed using the operation lamp of the indoor unit. Other functions are similar to those of the invention of claim 2.

[0014]

1 to 6 show an example in which the present invention is applied to a separation type air conditioner composed of an indoor unit and an outdoor unit. This air conditioner includes an indoor heat exchanger mounted on an indoor unit and an outdoor heat exchanger mounted on an outdoor unit, a compressor, a pressure reducing means (motorized expansion valve, capillary tube, etc.), a four-way valve and a solenoid valve as refrigerants. A heat pump type refrigerant circuit is configured by connecting with a pipe, and a cooling operation, a heating operation, and a dehumidifying operation can be appropriately performed by switching the four-way valve and / or the electromagnetic valve.

First, the electric circuit of the indoor unit will be described with reference to FIG.

In the figure, 1 is a plug which can be inserted into an outlet for an air conditioner, F is a fuse, 2 is a rectifying circuit for rectifying the AC power input through the plug 1, and 3 is a cross-flow fan for temperature-controlled air blowing. A DC brushless motor 4 for driving the DC voltage applied to the brushless motor 3 is 10 to 36V based on a control signal from the microcomputer 5.
A power supply circuit for a motor (switching power supply circuit), 6 is a motor drive circuit that switches energization to each winding of the brushless motor 3 based on a control signal from the microcomputer 5, and 7 is used for the microcomputer 5 and the like. It is a control power supply circuit that generates a controlled DC power (5 V).

The microcomputer 5 stores a program for controlling the operation of each device according to the operation mode, a ROM storing an input voltage determination program and a determination table, which will be described in detail later, and operation data and control data. RAM
And a CPU for executing the program are housed in the same package. It is also possible to store some of the above programs, tables and data in an external ROM and connect them to the microcomputer 5.

Reference numeral 8 is a switch board equipped with an ON / OFF switch, a trial operation switch, etc., 9 is a remote operation signal from the wireless remote controller 10 (ON / OFF signal, operation mode switching signal, room temperature setting signal, air flow rate setting signal, etc.). Receiver 11 for receiving a driving lamp 11a composed of an LED,
This is a display board equipped with a cooling lamp, a heating lamp, a dehumidifying lamp, and the like.

Reference numeral 12 denotes a room temperature sensor for detecting the temperature inside the room,
Reference numeral 13 is a heat exchanger temperature sensor that detects the temperature of the indoor heat exchanger, and 14 is a humidity sensor that detects the indoor humidity. The detection signals (analog signals) of these sensors are taken in by the microcomputer 5 after A / D conversion. . Reference numeral 15 denotes a step motor that drives a flap for varying the blowing direction of the temperature-controlled air, and its rotation angle is controlled by a control signal (pulse train) from the microcomputer 5.

Reference numeral 16 is a heater for auxiliary heating that is energized during defrosting operation, 17 is a relay, and 18 is a triac for the heater. Reference numeral 19 denotes a driver, which controls the relay 17 and the triac 18 based on a control signal from the microcomputer 5 so that the amount of heat generated by the microcomputer 5 can be controlled.

Reference numeral 20 is a serial for converting control data (frequency of AC power supplied to the compressor motor, four-way valve switching signal, etc.) from the microcomputer 5 into a serial signal or converting a serial signal transmitted from the outdoor unit side. Circuit. Reference numerals 21 and 22 are power terminals for transmitting the AC power input through the plug 1 to the outdoor unit, and 23 is a communication terminal for performing serial communication between both units.

Reference numeral 24 is a microcomputer 5 that detects the voltage of the AC power input through the plug 1 and outputs a detection signal corresponding to the voltage value.
An input voltage detection circuit (refer to FIG. 2) for outputting to the motor, and 25 are motors for driving a drain water discharge pump. Reference numeral 26 is a motor drive circuit provided with a relay and the like, which controls the supply of AC power to the motor 25 based on a control signal from the microcomputer 5 and also controls the motor 25 based on a drain pump signal from the input voltage detection circuit 24. Switch the coil connection of serial / parallel.

The input voltage detection circuit 24 has a circuit configuration as shown in FIG. In the figure, I1 and I
2 is an input terminal for AC power, I3 is an input terminal for a latch signal, O1 is an output terminal for a detection signal, O2 is an output terminal for a coil switching signal, Q1 is a PNP transistor, and Q2 to Q4.
Is an NPN transistor, R1 to R12 are resistors, C1
~ C3 is a capacitor, ZD is a Zener diode, PH
C is a photocoupler.

Direct current power of 5V is supplied from the control power supply circuit 7 to the circuit, its input terminals I1 and I2 are connected to a power line, and the input terminal I3 is an NPN transistor Q5 as shown in FIG. Is connected to the microcomputer 5 via. Further, 5V DC power is supplied to the output terminal O1 via the resistor R13, and the output terminal O1 is connected to the microcomputer 5 via the resistor R14 and the scanning interface IF. Q6 in the figure is an NPN type transistor that controls the interface IF based on a signal from the microcomputer 5. Further, the output terminal O2 is connected to a relay coil RL2 of the motor drive circuit 26 described later.

The input voltage detection circuit 24 has an input terminal I
When the input voltage to 1 and I2 is AC100V, a high level detection signal is output to the output terminal O1 and a high level coil switching signal is output to the output terminal O2. On the other hand, the input voltage to the input terminals I1 and I2 is AC200V.
At this time, a low level detection signal is output to the output terminal O1,
At the same time, a low level coil switching signal is output to the output terminal O2. The operation by the latch signal of the circuit will be described later in detail together with the input voltage determination program.

Motor drive circuit 2 for the above drain pump
6 has a circuit configuration as shown in FIG. In the figure, RL1 and RL2 are relay coils, and RS1 and RS2 are switches driven by the relay coils RL1 and RL2. The switch RS1 is for controlling the supply of AC power to the motor 25, and the switch RS2 is for connecting the coils of the motor 25 in parallel (for AC100) and in series (AC100).
It is for switching to 200V).

As shown in the figure, the switch RS1 has its input side connected to the power line, the relay coil RL1 connected to the microcomputer 5, and the relay coil RL2 connected to the output terminal O2 of the input voltage detection circuit 24. .

The motor drive circuit 26 switches the relay switch RS2 to the solid line position in the figure when a high level coil switching signal is output from the output terminal O2 of the input voltage detection circuit 24, that is, when the input voltage is AC100V. The coils of the motor 25 are connected in parallel. On the other hand, when a low level coil switching signal is output from the output terminal O2 of the input voltage detection circuit 24, that is, the input voltage is AC200V.
At this time, the relay switch RS2 is switched to the position indicated by the broken line in the figure to connect the coils of the motor 25 in series. The relay coil RL1 is driven by a control signal from the microcomputer 5 to open / close the switch RS1.

Next, the electric circuit of the outdoor unit will be described with reference to FIG.

In the figure, 51 and 52 are power terminals connected to the power terminals 21 and 22 of the outdoor unit via a power line, and 53 is a communication terminal connected to the communication terminal 23 of the outdoor unit via a communication line. .

54 is a power terminal 51 through a fuse F,
A varistor connected to 52, 55 is a noise filter, 5
Reference numeral 6 is a choke coil, 57 is a voltage doubler circuit for rectifying an AC power supply to generate 280 V DC power, 58 is a noise filter, 59 is a smoothing circuit for smoothing the doubled voltage, and 60 is a smoothing circuit via a fuse F. A motor drive circuit connected to 60, 61 is a three-phase induction motor for driving the compressor of the refrigeration circuit. The motor drive circuit 60 is a microcomputer 63
It is for PWM control of energization to the compressor motor 61 based on the control signal from, and an inverter device in which six power transistors are connected in a three-phase bridge shape is used.

Reference numeral 62 is a serial circuit for converting control data (outside air temperature, current rotation speed of the compressor motor, etc.) from the microcomputer 63 into a serial signal or a serial signal transmitted from the indoor unit side, which is a communication terminal. It is connected to 53. Reference numeral 64 denotes a current detection circuit that detects the current supplied to the load of the outdoor unit by the current transformer 65, smoothes it to a DC voltage, and then outputs it to the microcomputer 63, and 66 denotes the microcomputer 63.
A power supply circuit for control that generates direct current power (5 V) for control used for the motor drive circuit 6 through a fuse F.
It is connected to the input side of 0.

The microcomputer 63 has a ROM storing a program for controlling the operation of each device based on the control data transmitted from the indoor unit side, a RAM storing the control data, and a CPU executing the program. Etc. are housed in the same package.

67 is an outside air temperature sensor for detecting the temperature of the outside air, 68 is a heat exchanger temperature sensor for detecting the temperature of the outdoor heat exchanger, and 69 is a discharge temperature sensor for detecting the refrigerant temperature on the discharge side of the compressor. The microcomputer 5 A / D-converts the detection signals (analog signals) of these sensors and fetches them.

Reference numeral 70 is an induction motor for driving a fan for an outdoor heat exchanger, 71 is an air volume adjusting circuit having a plurality of switching contacts and open / close contacts, and which of the speed adjusting terminals of the motor 70 is supplied with AC power. Is selected to change the rotation speed of the motor 70 in three steps. 72 is a four-way valve for the refrigeration circuit, 73 is a triac for the four-way valve, 74 is a solenoid valve for the refrigeration circuit, 75 is a triac for a solenoid valve, and 76 is an air volume adjusting circuit 71 and a triac 7 based on a control signal from the microcomputer 63.
It is a driver for controlling 3,75.

Next, the procedure for determining the input voltage in the air conditioner described above will be described with reference to FIG.

After the installation of the air conditioner is completed, when the plug 1 of the indoor unit is inserted into the outlet for the air conditioner and the power is turned on (step ST1), both the judgment counter n and the judgment timer t are reset, and the judgment timer t Starts (step ST2). Then, the judgment counter n is set to 1
Is added and the first determination of the input voltage is performed (step ST3).

In this judgment, the detection signal is fetched from the input voltage circuit 24, and this is read by the R of the microcomputer 5 on the indoor unit side.
Comparison judgment using the judgment table stored in the OM,
Specifically, it is performed by comparing the detection signal with the capacity data unique to the air conditioner (steps ST4 and ST5). As described above, from the output terminal O1 of the input voltage circuit 24, a high-level detection signal is output to the microcomputer 5 when the AC power input through the plug 1 is AC100V, and a low-level detection signal is input to the microcomputer 5 when the AC power is AC200V. Is entered.

There are a single type air conditioner for AC100V and one for AC200V depending on its capability. By the way, the ones with the abilities of 20 & 25, 28 and 32 (each unit is 100 Kcal) shown in FIG.
For C100V, capacity 40 and 50 (both units are 100
Kcal) is for AC200V.

As shown in FIG. 6, the ability is 20 & 25 and 28.
In the cases of 32 and 32, when the input detection signal is at the high level, OK is determined, and when the input detection signal is at the low level, NG is determined. When the capability is 40 and 50, the determination of OK is made when the input detection signal is at the low level, and the determination is NG when the input detection signal is at the high level.
The judgments are made respectively.

The above judgment is repeated 3 times in succession, and 3
It is judged that the input voltage is proper upon coincidence of times, and the others are judged to be inappropriate (step ST6). Further, there is a time limit by the judgment timer t in the above judgment, and if the judgment cannot be made within 1 second after the power is turned on, an improper judgment is made (step ST7).

If it is determined that the input voltage is appropriate, then a drain pump control latch signal is output to the input voltage detection circuit 24 (step ST8). This latch signal is the drain pump motor 25 due to incorrect voltage.
Is to prevent the damage (damage due to overvoltage when AC200V is supplied to the one for AC100V). As shown in FIG. 6, when the capacity is 20 & 25, 28 and 32 and the input voltage is AC100V, it is low. The level latch signal is output to the input terminal I3 of the input voltage detection circuit 24, and the latch signal outputs a high level coil switching signal from the output terminal O2 of the input voltage detection circuit 24 to the motor drive circuit 26 to output the coil of the motor 25. Is AC1000V
Are connected in parallel to correspond to. When the capability is 40 and 50 and the input voltage is AC200V, a high-level latch signal is output to the input terminal I3 of the input voltage detection circuit 24, and the latch signal causes a low level output from the output terminal O2 of the input voltage detection circuit 24. A level coil switching signal is output to the motor drive circuit 26 so that the coil of the motor 25 is AC200.
It is connected in parallel so as to correspond to V. After that, the normal operation becomes possible, and the cooling operation, the heating operation, and the dehumidifying operation are appropriately performed based on the operations of the switch substrate 8 and the wireless remote controller 10 (step ST9).

On the other hand, when it is determined that the input voltage is improper, the latch signal is input to the input voltage detection circuit 2 as in the above.
4 is output (step ST10). In this case,
As shown in, a low-level latch signal for all capabilities is output to the input terminal I3 of the input voltage detection circuit 24, and the latch signal causes the output terminal O2 of the input voltage detection circuit 24 to be output.
A high level coil switching signal from the motor drive circuit 26
In addition, the switch RS1 is opened and the power supply to the drain pump motor 25 is cut off to prevent its failure. After this, the operation lamp 11a of the display board 11
Blinking at 3 second intervals (step ST11), and this blinking indicates to the air conditioner installer that the input voltage is incorrect, that is, the AC power voltage supplied to the air conditioner outlet does not correspond to the installed model. Encourage shutting down and re-doing electrical wiring work.

As described above, according to the air conditioner of the present embodiment, even if the AC power supplied to the outlet for the air conditioner has a voltage error, the operation lamp 11a on the indoor unit side is turned on and off at the same time when the power is turned on. It is possible to display the error by accurately indicating to the air conditioner installer that the voltage is wrong, and it is possible to quickly take measures such as shutting down the power supply and re-doing the electric wiring work.

Moreover, since the input voltage is determined based on the capacity data unique to the air conditioner, it is not necessary to newly input the data dedicated to the determination, and the determination processing adapted to the model can be realized.

Further, since the determination of the input voltage is repeated three times in succession and the proper determination is made with the coincidence three times, it is possible to prevent the determination error due to the external influence such as noise and to accurately determine the correctness. In addition, it is possible to further improve the reliability by giving a time limit to the determination. . In addition, an error in the input voltage can be detected by the existing operation lamp 11a
Since it is carried out by utilizing, it is not necessary to provide a new display means for displaying, which is advantageous in terms of cost.

The example in which the present invention is applied to a single type air conditioner has been described above, but the present invention is also applied to a multi type air conditioner having a plurality of indoor units with respect to one outdoor unit. be able to. There are multi-type air conditioners having the ability as shown in FIG. 7 as well as the single type air conditioners, but normally 200V AC power is used for all the ability. In this multi-type air conditioner, as shown in FIG. 7, the detection signals input for all capabilities are low level (AC200
V), OK is determined, and when the input detection signal is at a high level (AC100V), NG is determined. In addition, the latch signal output to the input voltage detection circuit 24 when the input voltage is determined to be proper is at a high level in all capabilities, and when the input voltage is determined to be inappropriate, the latch signal is input to the input voltage detection circuit 24. The latch signal that is output is at a low level for all capabilities. Incidentally, in the multi-type air conditioner, the capability data transmitted from each outdoor unit by serial communication may be added to the determination table, and the input voltage may be determined using this as the determination reference.

In the above embodiment, the erroneous voltage is displayed by blinking the operation lamp on the indoor unit side. However, when the indoor unit display plate has a display such as a liquid crystal panel, etc. You may make it display the error message which concerns on an incorrect voltage. Further, if the drive circuit of the drain pump motor can be controlled directly from the microcomputer without passing through the input voltage detection circuit, the output circuit O2, the input terminal I3 in FIG. Can be simplified.

[0049]

As described above in detail, according to the invention of claim 1, even when the commercial AC power supply for the air conditioner has a voltage error, it can be displayed by the display means at the same time when the power is turned on. However, there is an advantage that the air conditioner installer can be accurately notified of the voltage error and that the power supply can be cut off and the electric wiring work can be redone. Moreover, since the input voltage is determined based on the capacity data unique to the air conditioner, it is not necessary to newly input the data dedicated to the determination, and the determination processing adapted to the model can be realized.

According to the second aspect of the present invention, the input voltage determination is repeated a plurality of times to make the appropriate determination based on the previous coincidence. Therefore, the determination error due to external influence such as noise can be prevented and the correctness determination can be accurately performed. It can be carried out. The other effects are the same as those of the invention of claim 1.

According to the invention of claim 3, since the input voltage is erroneously utilized by using the existing operation lamp, it is not necessary to provide a new display means for displaying, which is advantageous in cost. . Other effects are similar to those of the invention of claim 2.

[0052]

[Brief description of drawings]

FIG. 1 is an electric circuit diagram of an indoor unit

FIG. 2 is a specific circuit diagram of an input voltage detection circuit.

FIG. 3 is a specific circuit diagram of a drain pump motor drive circuit.

FIG. 4 is an electric circuit diagram of the outdoor unit.

FIG. 5 is a flowchart of an input voltage determination program.

[Figure 6] Single type air conditioner judgment table

Figure 7: Multi-type air conditioner judgment table

[Explanation of symbols]

 1 Plug 5 Microcomputer 11a Operation lamp 24 Input voltage detection circuit.

Claims (3)

[Claims] 1. An air conditioner equipped with either an electric device compatible with 100 V AC or an electric device compatible with 200 V AC, which is compatible with either AC 100 V or AC 200 V based on the AC voltage supplied from a commercial AC power source. Input voltage detection means for outputting the detected signal and an input voltage determination device for determining whether or not the alternating current corresponds to the electric device based on the detected signal and the mounted electric device and outputting the determination signal. An air conditioner comprising: a means and a display means for displaying that at least the alternating current does not correspond to the electric device based on the determination signal. 2. In an air conditioner equipped with either an electric device compatible with 100 V AC or an electric device compatible with 200 V AC based on its rated capacity, AC 100 V or AC 2 based on the AC voltage supplied from a commercial AC power source.
Input voltage detection means for outputting a detection signal corresponding to any of 00V, and the alternating current corresponds to the electric device based on the detection signal and the value of the rated capacity stored in advance in the storage unit of the air conditioner. An input voltage determining means for determining whether or not the output voltage is output, and a display means for displaying that at least the alternating current does not correspond to the electric device based on the determination signal. A characteristic air conditioner. 3. In an air conditioner equipped with either an electric device compatible with 100 V AC or an electric device compatible with 200 V AC based on rated capacity, AC 100 V or AC 2 based on the AC voltage supplied from a commercial AC power source.
Input voltage detection means for outputting a detection signal corresponding to any of 00V, and the alternating current corresponds to the electric device based on the detection signal and the value of the rated capacity stored in advance in the storage unit of the air conditioner. Input voltage determining means for determining whether or not the output is performed, and at least the alternating current does not correspond to the electric device on the basis of the determination signal on the display section showing the operating state of the air conditioner. An air conditioner comprising: an abnormality display means for displaying.