JP3152560B2 - 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 air conditioner for performing indoor air conditioning.

[0002]

2. Description of the Related Art Buildings such as independent houses and condominiums are provided with electric wiring generally called a single-phase three-wire system. This single-phase three-wire electrical wiring is composed of a neutral wire and two 100 V wires, and one of the 100 V wires and the neutral wire supplies single-phase 100 V AC power, and two 100 V wires. Single-phase 200 V AC power can be selectively obtained.

The above-mentioned electric wiring is entrusted to a contractor other than a contractor, and the contractor refers to home appliances, for example, air conditioners, installed in the building with reference to drawings, materials, etc. given by the contractor. Wiring is performed so that the AC power required for the machine can be supplied to the outlet near the indoor unit installation position.

[0004]

However, there are air conditioners of the AC100V and AC200V types depending on their capabilities, including single and multi-type air conditioners. Accordingly, either one of the AC power is supplied.

However, in the electric wiring described above, a voltage error is caused due to an error in information transmission between traders and a rudimentary wiring error, that is, AC 200 V is supplied to an outlet to which AC 100 V is supplied, and AC 200 V is supplied to an outlet to which AC 100 V is to be supplied. An error may occur such that the outlet to be supplied is supplied with AC100V.

The conventional air conditioner does not have a function of detecting the above voltage error by itself, and there is no other way but to deal with the application of overvoltage by breaking the fuse, varistor and the like. Fuses and varistors can be damaged even when the air conditioner itself fails, so after all, even if the cause of the failure is incorrect voltage, it takes time and effort to find it. is there.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object 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 100 V or an electrical device compatible with AC 200 V, the AC voltage supplied from a commercial AC power supply is set. Input voltage detecting means for outputting a detection signal corresponding to either AC100V or AC200V based on the detected signal and whether the alternating current corresponds to the electric device based on the detected signal and the mounted electric device. Input voltage determining means for determining and outputting the determination signal, and display means for displaying at least that the alternating current does not correspond to the electric device based on the determination signal.

Also, in an air conditioner equipped with either an electric device compatible with AC 100 V or an electrical device compatible with AC 200 V based on the rated capacity, AC 100 V or A based on the AC voltage supplied from a commercial AC power supply.
Input voltage detection means for outputting a detection signal corresponding to any one of C200V, 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 judgment means for judging whether or not the electric device is operating, and display means for displaying at least that the alternating current does not correspond to the electric device based on the judgment signal. is there.

Further, in an air conditioner equipped with either an electric device compatible with AC 100 V or an electrical device compatible with AC 200 V based on the rated capacity, AC 100 V or A based on the AC voltage supplied from a commercial AC power supply.
Input voltage detection means for outputting a detection signal corresponding to any one of C200V, 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 power supply is operating and outputting a determination signal, and at least the alternating current does not correspond to the electric device based on the determination signal on a display unit indicating an operation state of the air conditioner. Is displayed on the display unit.

[0011]

According to the first aspect of the present invention, when power is supplied to the air conditioner by plugging into an outlet or the like, a detection signal corresponding to each of AC 100 V and AC 200 V is output from the input voltage detection means, and the detection signal is output. The input voltage determination means determines whether the input voltage is correct or not by comparing the input voltage with the electrical equipment mounted on the air conditioner. Then, based on the judgment signal output from the input voltage judgment means, at least an error in the input voltage is displayed on the display means, whereby the voltage error in the commercial AC power supply is notified to the air conditioner installer.

According to the second aspect of the present invention, the input voltage determining means determines whether the input voltage is correct or not based on the value of the rated capacity previously stored in the storage unit of the air conditioner.

According to the third aspect of the present invention, when there is an error in the input voltage, the error is displayed using the operation lamp of the indoor unit. Other operations are the same as those of the second aspect.

[0014]

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

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

In FIG. 1, reference numeral 1 denotes a plug which can be inserted into an air-conditioner outlet, F denotes a fuse, 2 denotes a rectifier circuit for rectifying AC power input through the plug 1, and 3 denotes a cross-flow fan for controlling temperature-controlled air. A DC brushless motor for driving the brushless motor 3 applies a DC voltage applied to the brushless motor 3 to 10 to 36 V based on a control signal from the microcomputer 5.
A power supply circuit for a motor (switching power supply circuit) for changing to a range of 6; a motor drive circuit 6 for switching energization to each winding of the brushless motor 3 based on a control signal from the microcomputer 5; The control power supply circuit generates a control DC power (5 V).

The microcomputer 5 stores a program for controlling the operation of each device according to the operation mode, a ROM for storing an input voltage determination program and a determination table which will be described in detail later, and stores operation data and control data. RAM
And a CPU for executing a program are housed in the same package. Note that a part of the above programs, tables, and data may be stored in an external ROM and connected to the microcomputer 5.

Reference numeral 8 denotes a switch board having an ON / OFF switch, a trial operation switch, and the like. 9 denotes a remote operation signal (ON / OFF signal, operation mode switching signal, room temperature setting signal, air volume setting signal, etc.) from the wireless remote controller 10. , A driving lamp 11a comprising an LED,
The display panel includes a cooling lamp, a heating lamp, a dehumidification lamp, and the like.

Reference numeral 12 denotes a room temperature sensor for detecting a room temperature.
Reference numeral 13 denotes a heat exchanger temperature sensor for detecting the temperature of the indoor heat exchanger, and reference numeral 14 denotes a humidity sensor for detecting the humidity in the room. . Reference numeral 15 denotes a step motor for driving a flap for varying the direction of temperature-controlled air blowing, and its rotation angle is controlled by a control signal (pulse train) from the microcomputer 5.

Reference numeral 16 denotes a heater for auxiliary heating which is energized during a defrosting operation or the like, reference numeral 17 denotes a relay, and reference numeral 18 denotes 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 to enable the microcomputer 5 to control the amount of heat generated.

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

A microcomputer 24 detects a voltage of the AC power input through the plug 1 and outputs a detection signal corresponding to the voltage value to the microcomputer 5.
, An input voltage detection circuit (see FIG. 2), and a motor 25 for driving a drain water discharge pump. Reference numeral 26 denotes 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 a motor 25 based on a drain pump signal from the input voltage detection circuit 24. Is switched in series / parallel.

The input voltage detection circuit 24 has a circuit configuration as shown in FIG. In the figure, I1 and I
2 is an AC power input terminal, I3 is a latch signal input terminal, O1 is a detection signal output terminal, O2 is a coil switching signal output terminal, 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.

The circuit is supplied with DC power of 5 V from the control power supply circuit 7. As shown in FIG. 3, the input terminals I1 and I2 are connected to the power line, and the input terminal I3 is connected to the NPN transistor Q5. Is connected to the microcomputer 5 via the. The output terminal O1 is supplied with 5 V DC power via a resistor R13. The output terminal O1 is connected to the microcomputer 5 via a resistor R14 and a scanning interface IF. Q6 in the figure is an NPN 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, when the input voltage to the input terminals I1 and I2 is AC200V
Outputs a low-level detection signal to the output terminal O1.
At the same time, a low-level coil switching signal is output to the output terminal O2. The operation of the circuit based on the latch signal will be described later in detail together with the input voltage determination program.

Motor drive circuit 2 for drain pump described above
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 respective 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 (for AC100).
(For 200 V).

As shown in the figure, the switch RS1 has its input side connected to the power line, the relay coil RL1 is connected to the microcomputer 5, and the relay coil RL2 is 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 position indicated by the solid line 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 100V AC. To connect the coils of the motor 25 in parallel. On the other hand, when a low-level coil switching signal is output from the output terminal O2 of the input voltage detecting circuit 24, that is, when 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 and close the switch RS1.

Next, an 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. .

Reference numeral 54 denotes a power terminal 51,
A varistor connected to 52; 55 a noise filter;
6 is a choke coil, 57 is a voltage doubler circuit that doubles voltage rectifies an AC power supply to generate 280 V DC power, 58 is a noise filter, 59 is a smoothing circuit that smoothes 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 above-described motor drive circuit 60 includes a microcomputer 63
And PWM control of energization to the compressor motor 61 based on a control signal from the inverter, using an inverter device in which six power transistors are connected in a three-phase bridge shape.

Reference numeral 62 denotes 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 converting a serial signal transmitted from the indoor unit side. 53. A current detection circuit 64 detects a current supplied to the load of the outdoor unit by the current transformer 65, smoothes the DC voltage, and outputs the DC voltage to the microcomputer 63.
A control power supply circuit for generating a control DC power (5 V) used for the control and the like.
0 is connected to the input side.

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

An outside air temperature sensor 67 detects the temperature of the outside air, a heat exchanger temperature sensor 68 detects the temperature of the outdoor heat exchanger, and a discharge temperature sensor 69 detects the refrigerant temperature on the discharge side of the compressor. The microcomputer 5 performs A / D conversion on the detection signals (analog signals) of these sensors and captures them.

Reference numeral 70 denotes an induction motor for driving a fan for an outdoor heat exchanger, and reference numeral 71 denotes an air volume control circuit having a plurality of switching contacts and switching contacts. Is selected to change the rotation speed of the motor 70 in three stages. 72 is a four-way valve of the refrigeration circuit, 73 is a triac for the four-way valve, 74 is a solenoid valve of the refrigeration circuit, 75 is a triac for the solenoid valve, and 76 is an air volume control circuit 71 and a triac 7 based on a control signal from the microcomputer 63.
3 and 75.

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

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

In this determination, a detection signal is fetched from the input voltage circuit 24 and is input to the R of the microcomputer 5 of the indoor unit.
Comparison judgment using a judgment table stored in the OM,
More specifically, the detection is performed by comparing the detection signal with performance data unique to the air conditioner (steps ST4 and ST5). As described above, a high-level detection signal is output from the output terminal O1 of the input voltage circuit 24 to the microcomputer 5 when the AC power input through the plug 1 is AC 100V, and a low-level detection signal is output when the AC power is AC 200V. Is entered.

There are two types of single type air conditioners, one for AC 100V and the other for AC 200V, depending on the capacity. By the way, those with the abilities 20 & 25, 28 and 32 (each unit is 100 Kcal) shown in FIG.
For C100V, capacity 40 and 50 (unit is 100
Kcal) is for AC200V.

As shown in FIG. 6, the abilities are 20 & 25 and 28.
In the cases of and 32, an OK determination is made when the input detection signal is at a high level, and an NG determination is made when the input detection signal is at a low level. If the capability is 40 or 50, OK is determined when the input detection signal is at a low level, and NG is determined if the input detection signal is at a high level.
Are determined respectively.

The above determination is repeated three times in succession.
It is determined that the input voltage is appropriate with the times coincidence, and the others are determined to be inappropriate (step ST6). In addition, there is a time limit in the above determination by the determination timer t. If the determination cannot be made within one second after the power is turned on, an inappropriate determination 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 output to the drain pump motor 25 due to incorrect voltage.
To prevent damage due to overvoltage when AC200V is supplied to AC100V, as shown in FIG. 6, when the capacity is 20 & 25, 28, and 32 and the input voltage is AC100V, low. A level latch signal is output to the input terminal I3 of the input voltage detection circuit 24, and a high level coil switching signal is output from the output terminal O2 of the input voltage detection circuit 24 to the motor drive circuit 26 according to the latch signal. Is AC1000V
Are connected in parallel to correspond to. When the capability is 40 and 50 and the input voltage is AC 200 V, a high-level latch signal 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 output a low signal. The level coil switching signal is output to the motor drive circuit 26 and the coil of the motor 25 is
V are connected in parallel to correspond to V. Thereafter, the normal operation is enabled, and the cooling operation, the heating operation, and the dehumidifying operation are appropriately performed based on the operation of the switch board 8 and the wireless remote controller 10 (step ST9).

On the other hand, when it is determined that the input voltage is inappropriate, the latch signal is output to the input voltage detection circuit 2 in the same manner as described above.
4 (step ST10). In this case, FIG.
As shown in (1), a low level latch signal is output to the input terminal I3 of the input voltage detection circuit 24 for all the capabilities, and the latch signal outputs the output terminal O2 of the input voltage detection circuit 24.
From the motor drive circuit 26
At the same time, 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 panel 11
Is blinked at intervals of 3 seconds (step ST11), and this blinking indicates to the air conditioner installer that the input voltage is incorrect, that is, the voltage of the AC power supplied to the air conditioner outlet does not correspond to the installed model. Encourage interruption and rework of electrical wiring work.

As described above, according to the air conditioner of the present embodiment, even if the AC power supplied to the air conditioner outlet has a voltage error, the AC power is turned on and the operation lamp 11a of the indoor unit is turned on and off at the same time. There is an advantage that it is possible to promptly notify the air conditioner installer of the voltage error and promptly take measures such as shutting down the power supply and redoing the electrical wiring work.

Moreover, since the input voltage is determined based on the performance data unique to the air conditioner, it is not necessary to newly input data dedicated to the determination, and the determination process suitable for the model can be realized.

Further, since the input voltage is determined three times in succession and the match is determined three times, an appropriate determination is made. Therefore, it is possible to prevent a determination error due to an external influence such as noise and to make an accurate determination. In addition, the reliability can be further improved by giving a time limit to the determination. . Further, the error of the input voltage is detected by using the existing operation lamp 11a.
Therefore, there is no need to provide new display means for display, which is advantageous in terms of cost.

Although the example in which the present invention is applied to a single-type air conditioner has been described above, the present invention is also applied to a multi-type air conditioner having a plurality of indoor units for one outdoor unit. be able to. The multi-type air conditioner has a capacity as shown in FIG. 7 similarly to the single type, but usually 200 V AC power is used for all the performances. In this multi-type air conditioner, as shown in FIG. 7, the detection signals inputted for all the capabilities are low level (AC200).
V), an OK determination is made, and an NG determination is made when the input detection signal is at a high level (AC 100 V). The latch signal output to the input voltage detection circuit 24 when the input voltage is determined to be appropriate is at a high level in all the abilities, and the latch signal is output to the input voltage detection circuit 24 when the input voltage is determined to be inappropriate. The output latch signal is at a low level for all capabilities. Incidentally, in the multi-type air conditioner, the capability data transmitted by serial communication from each outdoor unit may be added to the determination table, and the input voltage may be determined based on the added data.

In the above-described embodiment, an example is shown in which the operation lamp on the indoor unit side is blinked to indicate a voltage error. However, when the indoor unit has a display such as a liquid crystal panel on the display panel. An error message relating to a voltage error may be displayed on this. Also, if the drive circuit of the drain pump motor can be directly controlled by the microcomputer without passing through the input voltage detection circuit, the circuit can be omitted by excluding the components such as the output terminal O2, the input terminal I3 and the transistor in FIG. Can be simplified.

[0049]

As described above in detail, according to the first aspect of the present invention, even if the commercial AC power supply for an air conditioner has a wrong voltage, the voltage can be displayed on the display means simultaneously with the power-on. In addition, there is an advantage that it is possible to promptly take measures such as shutting off the power supply and redoing the electric wiring work by accurately notifying the air conditioner installer of the voltage error. In addition, since the input voltage is determined based on the performance data unique to the air conditioner, it is not necessary to newly input dedicated data for the determination, and the determination process suitable for the model can be realized.

According to the second aspect of the present invention, the input voltage is repeatedly judged a plurality of times, and the proper judgment is made based on the previous coincidence. It can be carried out. Other effects are the same as those of the first aspect.

According to the third aspect of the present invention, since the input voltage error is detected by using the existing operation lamp, it is not necessary to provide a new display means for displaying, and this is advantageous in cost. . Other effects are the same as those of the second aspect.

[0052]

[Brief description of the 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 motor drive circuit for a drain pump.

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

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

FIG. 6 is a determination table of a single type air conditioner.

FIG. 7 is a determination table for a multi-type air conditioner.

[Explanation of symbols]

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

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-210612 (JP, A) JP-A-64-30460 (JP, A) JP-A-2-287382 (JP, A) (58) Survey Field (Int.Cl. ⁷ , DB name) F24F 11/02 F24F 11/02 102 F24F 11/02 105

Claims (3)

(57) [Claims] An air conditioner equipped with either an electric device compatible with AC 100 V or an electrical device compatible with AC 200 V supports either AC 100 V or AC 200 V based on an AC voltage supplied from a commercial AC power supply. Input voltage detection means for outputting a detected signal, and input voltage determination for determining whether or not the alternating current corresponds to the electrical device based on the detection signal and the mounted electrical device, and outputting the determination signal An air conditioner comprising: means for displaying at least the alternating current does not correspond to the electric device based on the determination signal. 2. An air conditioner equipped with either an electrical device compatible with AC 100 V or an electrical device compatible with AC 200 V based on the rated capacity, based on the AC voltage supplied from a commercial AC power supply.
Input voltage detection means for outputting a detection signal corresponding to any one 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 judging means for judging whether or not the input is performed and outputting a judgment signal, and display means for displaying at least that the alternating current does not correspond to the electric device based on the judgment signal. A characteristic air conditioner. 3. An air conditioner equipped with either an electrical device compatible with AC 100V or an electrical device compatible with AC 200V based on the rated capacity, based on an AC voltage supplied from a commercial AC power supply.
Input voltage detection means for outputting a detection signal corresponding to any one 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 power supply is operating and outputting a determination signal, and at least the alternating current does not correspond to the electric device based on the determination signal on a display unit indicating an operation state of the air conditioner. An air conditioner comprising: an abnormality display means for displaying a message.