JPH10148372A - Control device of air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an unsafe condition such as the malfunction and burning of the equipment by comparing the operation data with the preliminarily obtained operation data of an air conditioner at the normal power source voltage, and judging the mistaken connection of the power source below the rated voltage. SOLUTION: In a control device of an air conditioner, a compressor is intentionally operated in the lock mode before entering the normal operation only for the first operation after resetting and turning on the main power source. The judgment point and the threshold are recorded in advance, and a compressor 34 is energized under the condition of the judgment point to detect the primary current, and it is judged that the 100V power source is not connected in a 200V power source model by whether the detected current value is larger or smaller than the threshold. As a result of the judgment, if result is normal, the operation is shifted to the normal one. If the result shows the different power source, it is indicated that the power source voltage is abnormal by an LED display 41, and no operation is performed unless the power source is tuned OFF/ON.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner and, more particularly, to protection against turning on a different power supply.

[0002]

[Prior art]

Conventional example 1. FIG. 13 shows, for example, Japanese Unexamined Patent Application Publication No.
FIG. 1 is a circuit diagram illustrating a conventional control device for an air conditioner disclosed in Japanese Unexamined Patent Application Publication No. H11-157,086. In the figure, 1 is a power supply, 2 is a transformer for converting a high-voltage AC voltage into a low-voltage AC voltage, 3 is an indoor unit control circuit, 9 is a connector provided in the indoor unit control circuit 3,
7 and 8 are connection terminals provided in the indoor unit control circuit 3. Reference numerals 10 and 12 are terminal boards, 11 is a remote controller, and 13 is an outdoor unit control circuit. 14 is a full-wave rectifier for converting AC to DC, 15 is a stabilized power supply circuit for smoothing the DC voltage obtained by the full-wave rectifier 14, and 16 is a voltage that generates an output when the DC voltage is lower than a set level. A detection circuit, 17 is a transistor connected to the output terminal of the voltage detection circuit 16, 18 is a reset circuit having an input terminal whose voltage level changes by the operation of the transistor 17, and an output terminal for operating the transistor 19, and 20 is the reset circuit. A microcomputer which is reset by the output voltage level of the output terminal 18 and sends an operation signal to the outdoor unit control circuit 13. A microcomputer 21 outputs a power cutoff signal of the remote controller 11 and an outdoor unit A cut-off circuit for interrupting the operation signal to the control circuit 13, and 22 is a buffer. On the other hand, 23 is a current detection circuit, and 24 is a transistor that operates with the output of the current detection circuit 23.
5 is connected in series, and its collector side is connected to the input terminal of the reset circuit 18. 26
Represents a DC voltage, and 27 represents 0V.

Next, the operation will be described. Remote control 11
When the abnormal current flows by connecting the terminal boards 10 and 12 by mistake or the outdoor unit control circuit 13 mistakenly detects the abnormal current by the current detection circuit 23 and immediately stops the operation of the microcomputer 20 by the reset circuit 18. With
The power supply of the remote controller 11 and the outdoor unit control circuit 13 is cut off by the cutoff circuit 21.

In the above-mentioned conventional example, the voltage in the control circuit of the indoor unit and the current flowing into the remote control and the outdoor control circuit are detected, and the microcomputer 20 of the indoor unit is reset by this detection signal to thereby control the power supply of the remote control and the outdoor. Since the signal to the machine control circuit is electrically cut off and the delay time set in the reset circuit is set to be longer than the time when the power supply voltage of the remote control is completely discharged, erroneous wiring or short circuit occurs in each control circuit. However, even if the power supply voltage drops due to an instantaneous voltage drop or the like, each control circuit is always reliably reset, so that malfunction and runaway of the microcomputer are prevented and reliability is improved. Further, there is an effect that the cost is reduced because the fuse is not required, and maintenance for replacing the fuse is not required.

Conventional example 2. FIG.
It is a block diagram of the power supply short circuit protection device of the conventional air conditioner shown in 22472 gazette. The purpose of this is to protect the equipment from dead shorts in the power supply line without blowing the current protection device (current fuse) when a power supply dead short circuit occurs due to incorrect connection of the power supply line. As shown in FIG. 14, the overcurrent detection device 104 is connected to the NC terminal 103 of the overcurrent detection switching device 101 connected to the commercial power source, and the control device 108 has:
The voltage conversion means 109 for converting the voltage difference of the overcurrent detection device 104 into a digital signal is compared with the digital signal of the voltage difference of the overcurrent detection device 104 and the overcurrent set value 111 in which an overcurrent value at the time of abnormality is stored in advance. And a transmitting unit 112 for transmitting a signal to the overcurrent detection switching device 101 based on the result of the comparison operation, and controls the overcurrent detection switching device 101 when a dead short occurs due to a power supply loop erroneous connection. Thus, a commercial power supply to the indoor unit is stopped, and a power supply short-circuit protection device that does not cause an unsafe state such as smoking or ignition of the device can be provided.

Conventional example 3. In some cases, erroneous switching of the main power supply is considered.In such a case, protection is provided only for voltages higher than the rated power supply voltage that directly damages the equipment, and for voltages lower than the rated power supply voltage. There was no means.

[0007]

Since the conventional protection device for an air conditioner is configured as described above, measures have been taken against damage due to incorrect wiring of the connection lines. There was no protection against input (conventional example 1,
2). In addition, in the case of Conventional Example 3 in which erroneous input of the main power supply is considered, if a voltage lower than the rated voltage is connected, erroneous operation that is difficult to surface continues, and erroneous input of power supply voltage may not be known for a long time. There was a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and when a power supply having a voltage lower than the rated voltage is erroneously connected at the time of construction or the like, unsafe operation such as malfunction or burnout of the equipment. It is an object of the present invention to provide a control device for an air conditioner that can be protected from being in a state. It is still another object of the present invention to provide a control device for an air conditioner that can easily detect erroneous input of a power supply voltage and prevent erroneous replacement of components.

[0009]

According to a first aspect of the present invention, there is provided a control apparatus for an air conditioner, comprising: at the time of starting operation of a compressor, operating data of the air conditioner at that time; Means for judging an erroneous connection of a power supply having a rated voltage or less by comparing the operation data of the air conditioner with the power supply.

According to a second aspect of the present invention, there is provided an air conditioner control apparatus according to the first aspect, wherein:
It is characterized by comprising a means for detecting an input current during the lock operation of the compressor, and a means for determining an erroneous connection of a power supply having a rated voltage or less from the input current during the lock operation of the compressor.

According to a third aspect of the present invention, there is provided the air conditioner control device according to the first aspect,
At the start of the compressor operation, there are provided means for detecting a power factor during operation of the compressor, and means for judging an erroneous connection of a power supply having a rated voltage or less from the power factor during operation of the compressor.

According to a fourth aspect of the present invention, there is provided the air conditioner control device according to the first aspect,
Overcurrent protection means for protecting a compressor drive power supply or the like from overcurrent; means for operating the compressor by increasing the power supply voltage by a predetermined voltage; and operating the compressor by increasing the power supply voltage by a predetermined voltage. Means for determining that the voltage is equal to or lower than the rated voltage when the overcurrent protection means does not operate.

According to a fifth aspect of the present invention, there is provided the air conditioner control device according to the first aspect.
Power supply frequency detection means for detecting the frequency of the power supply, and means for determining erroneous connection of a power supply below the rated voltage based on the width of the power supply voltage waveform detected by the power supply frequency detection means are provided.

According to a sixth aspect of the present invention, there is provided the air conditioner control device according to the first aspect, wherein:
Refrigerant pipe temperature detecting means for detecting the temperature of the refrigerant pipe, and means for determining erroneous connection of a power supply having a voltage equal to or lower than the rated voltage based on a difference in time when the refrigerant pipe temperature detected by the refrigerant pipe temperature detecting means changes. Features.

The control device for an air conditioner according to the invention of claim 7 is the control device for an air conditioner according to claim 1,
The compressor further comprises means for detecting the operating current of the compressor, and means for judging an erroneous connection of a power supply having a rated voltage or less from the operating current.

An air conditioner control apparatus according to an eighth aspect of the present invention is the air conditioner control apparatus according to the first aspect,
Means for switching between the cooling operation and the heating operation, a pipe temperature detecting means for detecting the pipe temperature, and a rating by comparing the pipe temperature detected by the pipe temperature detecting means with a previously determined pipe temperature at a normal power supply voltage. Means for determining erroneous connection of a power supply having a voltage equal to or lower than the voltage.

A control device for an air conditioner according to a ninth aspect of the present invention is the control device for an air conditioner according to any of the second to eighth aspects, wherein the compressor operates when the power supply voltage is different. Is provided.

According to a tenth aspect of the present invention, there is provided the air conditioner control device according to any one of the second to eighth aspects, further comprising a means for displaying a determination result of a power supply voltage. It is characterized by.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. Hereinafter, a control device for an air conditioner according to Embodiment 1 of the present invention will be described with reference to the drawings. FIG.
FIG. 1 is a block diagram of a control device for an air conditioner according to Embodiment 1 of the present invention. In the figure, 1 is an external power supply,
Reference numeral 31 denotes a noise filter for removing noise of the power supply 1, and 39 denotes primary current detection means and power supply frequency detection means for detecting a current value and a voltage phase after passing through the noise filter 31. Reference numeral 40 denotes data conversion means for converting data detected by the primary current detection means / power supply frequency detection means 39 into a digital signal, and reference numeral 20 denotes a microcomputer to which the digital signal converted by the data conversion means 40 is input.

On the other hand, 14 is a full-wave rectifier, 32 is a smoothing capacitor, and the current for driving the compressor is converted into a DC current by the full-wave rectifier 14 and the smoothing capacitor 32. 35 is a thermistor for detecting pipe temperature, 37 is a detection circuit thereof, and the microcomputer 20 is a detection circuit 37 and a data conversion means 4.
The operation condition of the compressor 34 is calculated from 0 and operation request data (not shown) from the indoor unit.

A power transistor drive circuit 42 outputs a pulse signal for switching the power transistor 33 from the microcomputer 20. Reference numeral 43 denotes a compressor power factor detection circuit that detects the operating power factor of the compressor 34 from the compressor current and provides feedback to the microcomputer 20. Reference numeral 44 denotes an overcurrent detection means, which is mainly used to protect the power transistor 33. When an overcurrent is detected, the operation is stopped by the microcomputer 20 by software, and the operation of the hardware is also stopped by the drive circuit 42. I have. 3
Reference numeral 6 denotes a four-way valve for switching between cooling and heating, which is controlled by the microcomputer 20. Reference numeral 41 denotes a monitor LED that mainly performs an abnormality display and a protection display for a service.

Next, the operation will be described. FIG. 2 is a flowchart showing the operation of the control device for the air conditioner according to Embodiment 1 of the present invention, and FIG. 3 is a compressor lock current characteristic diagram in the control device for air conditioner according to Embodiment 1 of the present invention. . As shown in FIG. 2, the compressor is intentionally operated in the lock mode before the normal operation is performed only in the first operation after the reset and the main power is turned on (steps 200 and 20).
1). The reason for performing only the first time is to prevent the reliability of the compressor 34 from deteriorating during the lock operation and to eliminate the time lag until the shift to the normal operation. The locking method can be realized by performing high-frequency operation from the beginning when the compressor is started by outputting a voltage value lower than the appropriate voltage value.

The input current in the locked state has a substantially proportional relationship as shown in FIG. The judgment point and the threshold value at that time are stored in advance, and the primary current is detected by energizing the compressor 34 under the condition of the judgment point (step 202), and whether the detected current value is larger or smaller than the threshold value is determined. It is determined that the 100 V power supply is not connected in the 200 V power supply model (step 203). If the result of determination is normal, the operation shifts to normal operation (step 20).
4) If the power supply is different, the LED display 41 indicates that the power supply voltage is abnormal, and the operation is not performed unless the original power supply is turned off / on (step 205).

In the above-described embodiment, the compressor 34 is intentionally operated in the locked state, and the current value detected by the current detecting means is compared with the data at the time of the normal power supply voltage which is obtained in advance from the actual machine test and stored. Thus, a control device for an air conditioner that can determine whether the power supply voltage is correct is obtained.

Embodiment 2 Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a flowchart showing the operation of the control device for an air conditioner according to Embodiment 2 of the present invention. FIG. 5 is a flowchart showing Embodiment 2 of the present invention.
FIG. 4 is a power factor characteristic diagram of the control device for the air conditioner according to the first embodiment after a fixed time period from the start of compressor operation. The same or corresponding parts as in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
FIG. 5 shows the power factor data after a fixed time from the start of the compressor operation. The operating power factor of the compressor 34 is detected by the compressor power factor detection circuit 43 of FIG. If the voltage waveform data for driving the compressor is fixed, the difference in the power supply voltage will be the difference in the voltage applied to the compressor 34 as it is. Since a relatively large electric power is required for the torque for driving the compressor, the difference in the voltage applied to the compressor 34 appears directly in the difference in the power factor. Therefore, by comparing the power factor during the operation of the compressor with data confirmed in advance using a normal power supply voltage and an incorrect power supply voltage, it is possible to determine whether the power supply voltage is correct.

FIG. 4 is a flowchart showing the operation. The compressor is operated for a short time before the normal operation is performed only in the first operation after the reset and the main power is turned on (steps 400 and 401). FIG. 5 shows that the determination is performed only for the first time.
The power factor value depends on the operating mode, temperature conditions,
This is because the difference greatly changes depending on the operation time and the like, and erroneous determination is eliminated. The compressor 34 is operated for a short time for the same reason. The power factor is detected by the compressor power factor detection circuit 43 (step 402), and it is determined whether or not the 100V power supply is not connected to the 200V power supply model based on whether the detected power factor value is larger or smaller than the threshold value (step 402). 403).
As a result of the determination, if the power is normal, the operation shifts to the normal operation (step 404). If the power is different, the LED display 41 indicates that the power supply voltage is abnormal. Not performed (405).

In the second embodiment, the compressor 3 is in operation.
An air conditioner control device that can determine whether the power supply voltage is correct by comparing the power factor value of No. 4 with the data at the time of the normal power supply voltage that is obtained in advance from the actual machine test and stored is obtained.

Embodiment 3 Next, a third embodiment of the present invention will be described with reference to the drawings. FIG. 6 is a flowchart showing the operation of the control device for an air conditioner according to Embodiment 3 of the present invention, and FIG. 7 is Embodiment 3 of the present invention.
FIG. 4 is a V / F characteristic diagram of a compressor in a control device for an air conditioner according to the present invention. Note that the same or corresponding parts as in the first and second embodiments are denoted by the same reference numerals, and description thereof will be omitted.

The optimum value of the voltage applied to the compressor 34 for operating the compressor 34 depends on the operating frequency of the compressor 34 and the type of the compressor 34. If the voltage value is too large or too small, the compressor 34 locks or overcurrent flows too much, and the overcurrent detection circuit 4 shown in FIG.
4, and the compressor 34 stops. Therefore, the power supply voltage is determined by intentionally applying a voltage other than the optimum voltage value to the compressor 34 to determine whether or not to enter overcurrent protection.

As shown in FIG. 7, when the output voltage is intentionally increased by a during the operation at the operation frequency at the determination point, overcurrent protection is started. However, when the power supply voltage is 100 V, it is necessary to increase the voltage by b (a <b) without going into the overcurrent protection by merely increasing the voltage by a.

Before the first operation after resetting and turning on the main power supply and before the normal operation is started, the compressor is operated at a non-optimal voltage whose output voltage is increased by a at the judgment point (step 600, 601). Then, the overcurrent protection detection means 44 detects overcurrent protection (step 602).
If the overcurrent protection is activated, the voltage is determined to be normal, and if not, the voltage is determined to be incorrect (step 603). As a result of the determination, if the power is normal, the operation shifts to the normal operation (step 604). If the power supply is different, the LED display 41 indicates that the power supply voltage is abnormal, and the operation is continued unless the original power supply is turned off / on. Not performed (step 605).

In the third embodiment, the power supply voltage can be determined by intentionally applying a voltage other than the optimum voltage value to the compressor 34 to determine whether to enter overcurrent protection. A control device can be obtained.

In the third embodiment, the compressor 3
Although the method of detecting by driving the fourth embodiment has been described, the same effect can be obtained by executing the third embodiment in the lock operation mode described in the first embodiment.

Embodiment 4 Next, a fourth embodiment of the present invention will be described with reference to the drawings. FIG. 8 is a flowchart showing the operation of the control device for an air conditioner according to Embodiment 4 of the present invention, and FIG. 9 is Embodiment 4 of the present invention.
And FIG. 10 is a time chart showing the operation of the control device for an air conditioner according to Embodiment 4 of the present invention. Embodiment 1
The same or corresponding parts as those of Nos. 1 to 3 are denoted by the same reference numerals, and description thereof is omitted.

FIG. 9 is a circuit diagram showing an example of the power supply frequency detecting means of the primary current detecting means / power supply frequency detecting means 39 of FIG. Since the photocoupler 45 is turned off only near the zero cross of the AC power supply, the microcomputer 2
The input waveform to 0 is as shown in FIG.

The power supply frequency detection circuit measures the power supply frequency only immediately after the power is turned on, and determines 50/60 Hz based on the length c shown in FIG. Therefore, in the present embodiment, the determination of the power supply voltage is performed by utilizing the fact that the length of d changes depending on the power supply voltage.

Before the first operation after resetting and turning on the main power supply, and before the normal operation is started, the waveform width of the power supply voltage is measured (steps 800 and 801). Then, the power supply voltage is determined based on the waveform width (step 802). If the result of the determination is normal, the operation shifts to the normal operation (step 80).
3) If the power supply is different, the LED display 41 indicates that the power supply voltage is abnormal, and the operation is not performed unless the original power supply is turned off / on (step 804).

Embodiment 5 Next, a fifth embodiment of the present invention will be described with reference to the drawings. FIG. 11 is a flowchart showing the operation of the control device for an air conditioner according to Embodiment 5 of the present invention. Next, a fifth embodiment will be described with reference to the drawings. In the case where the compressor 34 is locked and does not operate, as well as in the case where the difference in the power supply voltage is large even when the compressor 34 is operated, the operable capacity of the compressor 34 is different. It will be different. The flowchart shown in FIG. 11 illustrates that a difference in power supply voltage is detected using the difference in temperature change. The reason why the amount of temperature change is used without using the absolute temperature is to reduce an error generated due to a difference in environmental conditions such as temperature. When operating with a 100 V power supply, the operating capacity of the compressor is lower than when operating with a 200 V power supply, so that the range of change in pipe temperature is smaller.

Before starting normal operation only for the first operation after resetting and turning on the main power supply, first, the pipe temperature is measured (steps 1100 and 1101). Next, the compressor 34 is operated for a predetermined time (step 1102). Then, in step 1103, the pipe temperature is re-measured to calculate the change width. In step 1104, it is determined whether the power supply voltage is correct based on the change width. As a result of the determination, if the power is normal, the operation shifts to the normal operation (step 1105). If the power is different, the LED display 41 indicates that the power supply voltage is abnormal, and the operation is continued unless the original power supply is turned off / on. Not performed (step 1106).

In the fifth embodiment, the change rate of the pipe temperature during the operation of the compressor is determined in advance from an actual machine test and is compared with the data at the normal power supply voltage to determine whether the power supply voltage is correct. A control device for the air conditioner to be performed can be obtained.

Embodiment 6 FIG. Next, a sixth embodiment of the present invention will be described with reference to the drawings. FIG. 12 is a flowchart showing the operation of the control device for an air conditioner according to Embodiment 6 of the present invention. The determination based on the detected value of the primary current is the same, except that the compressor 34 is operated normally. As described above, the compressor 34
Since the operation load varies greatly depending on the surrounding operation conditions and operation modes, the operation time is shortened, and the judgment conditions are changed between cooling and heating or the power supply frequency of 50 Hz and 60 Hz.

In FIG. 12, the power supply frequency is first read before starting the normal operation only in the first operation after the reset and the power supply is turned on (steps 1200 and 1201).
In step 1202, the operation mode is checked, and in step 1203, the compressor 34 is operated for a short time. The primary current is detected by the primary current detecting means / power supply frequency detecting means 39 in FIG. 1 (step 1204), and if it is determined in step 1205 whether or not the value is normal, normal operation is performed (step 1206). LED display 41 if power supply is different
Indicates that the power supply voltage is abnormal,
Operation is not performed unless FF / ON is performed (step 1207).

In the sixth embodiment, the current value during the operation of the compressor is obtained from an actual machine test in advance, and is compared with the data at the time of the normal power supply voltage to determine whether the power supply voltage is correct. Machine control device is obtained.

In the above-described sixth embodiment, both the difference between the cooling and heating and the power supply frequency are taken into consideration. However, if it is possible to determine one of them, it is sufficient to determine only one of them.

Embodiment 7 Next, a seventh embodiment of the present invention will be described. The four-way valve 36 in FIG. 1 receives a signal from the microcomputer 20 and operates the drive circuit 38, but uses a power supply voltage for direct operation. However, a four-way valve for a power supply voltage of 200 V has 100
It does not operate at the voltage of V. Therefore, when a four-way valve that switches to heating when operated is used, even if the heating operation is performed with the power supply voltage of 100 V, the cooling operation is performed without switching the four-way valve. That is, since the temperature of the refrigerant pipe is completely different from that in the normal state, the determination can be made based on the absolute temperature.

The detected pipe temperature is obtained from an actual machine test in advance and stored in comparison with the data at the normal power supply voltage, and the power supply voltage is correct based on whether or not the four-way valve which does not operate at the low power supply voltage is operating normally. Is determined.

In the above-described seventh embodiment, the case where a four-way valve which switches to heating when operated is used is taken as an example.
If you use a four-way valve for heating and cooling when not operating,
It is clear that heating is performed during cooling operation.

[0048]

The control device for an air conditioner according to any one of the first to eighth aspects of the present invention is characterized in that at the start of the compressor operation, the operation data of the air conditioner at that time and the normal power supply voltage obtained in advance. By providing a means for determining the incorrect connection of the power supply below the rated voltage by comparing the operation data of the air conditioner of Can be protected from becoming an unsafe state such as malfunction or burnout. Further, it is possible to easily find an erroneous input of the power supply voltage, and prevent erroneous replacement of parts.

According to a ninth aspect of the present invention, in the air conditioner control device according to any one of the second to eighth aspects, when the power supply voltage is equal to or lower than the rated voltage, the compression is performed. By having means to stop the operation of the machine,
When the power supply is at a voltage lower than the rated voltage, the operation is immediately stopped, thus greatly improving safety.

According to a tenth aspect of the present invention, there is provided the air conditioner control device according to any one of the second to eighth aspects, wherein the determination result of whether the power supply voltage is equal to or lower than the rated voltage is obtained. By providing the display means, the fact that the power supply voltage is a voltage power supply that is equal to or lower than the rated voltage is displayed by itself, so that there is an effect that erroneous determination and erroneous parts replacement are not performed at the time of service. .

[Brief description of the drawings]

FIG. 1 is a block diagram showing an operation of a control device for an air conditioner according to Embodiment 1 of the present invention.

FIG. 2 is a flowchart showing an operation of the control device for the air conditioner according to Embodiment 1 of the present invention.

FIG. 3 is a compressor lock current characteristic diagram in the control device for the air conditioner according to Embodiment 1 of the present invention.

FIG. 4 is a flowchart showing an operation of a control device for an air conditioner according to Embodiment 2 of the present invention.

FIG. 5 is a power factor characteristic diagram of the control device for an air conditioner according to Embodiment 2 of the present invention.

FIG. 6 is a flowchart showing an operation of the control device for the air conditioner according to Embodiment 3 of the present invention.

FIG. 7 is a V / F characteristic diagram of a compressor of a control device for an air conditioner according to Embodiment 3 of the present invention.

FIG. 8 is a flowchart showing the operation of the control device for an air conditioner according to Embodiment 4 of the present invention.

FIG. 9 is a main part circuit diagram of an air conditioner control device according to Embodiment 4 of the present invention.

FIG. 10 is a time chart illustrating an operation of a control device for an air conditioner according to Embodiment 4 of the present invention.

FIG. 11 is a flowchart showing the operation of the control device for an air conditioner according to Embodiment 5 of the present invention.

FIG. 12 is a flowchart showing the operation of the control device for an air conditioner according to Embodiment 6 of the present invention.

FIG. 13 is a circuit diagram of a conventional control device for an air conditioner.

FIG. 14 is a block diagram of another conventional control device for an air conditioner.

[Explanation of symbols]

1 power supply, 20 microcomputer, 34 compressor, 35 thermistor, 36 four-way valve, 39 primary current detecting means / power frequency detecting means, 41 monitor LED,
43 Compressor power factor detection circuit, 44 Overcurrent protection detection means.

Claims (10)

[Claims] 1. At the start of compressor operation, the operation data of the air conditioner at that time is compared with the operation data of the air conditioner at the time of a normal power supply voltage which is obtained in advance. A control device for an air conditioner, comprising: means for judging an incorrect connection of the air conditioner. 2. A compressor comprising: a means for detecting an input current during a lock operation of the compressor; and a means for determining an erroneous connection of a power supply having a rated voltage or less from the input current during the lock operation of the compressor. The control device for an air conditioner according to claim 1, wherein: 3. A means for detecting a power factor during operation of the compressor at the start of operation of the compressor; a means for determining erroneous connection of a power supply having a rated voltage or less based on the power factor during operation of the compressor; The control device for an air conditioner according to claim 1, further comprising: 4. An overcurrent protection means for protecting the compressor drive power supply and the like from overcurrent; a means for operating the compressor by increasing a power supply voltage by a predetermined voltage; and increasing the power supply voltage by a predetermined voltage. 2. The control device for an air conditioner according to claim 1, further comprising: means for judging a voltage equal to or lower than a rated voltage when the overcurrent protection means does not operate when the compressor is operated. 5. A power supply frequency detecting means for detecting a frequency of a power supply, and a means for judging an erroneous connection of a power supply having a rated voltage or less from a width of a power supply voltage waveform detected by the power supply frequency detecting means. The control device for an air conditioner according to claim 1, wherein: 6. A refrigerant pipe temperature detecting means for detecting a temperature of a refrigerant pipe, and an erroneous connection of a power supply having a rated voltage or less is determined based on a difference in a change time of the refrigerant pipe temperature detected by the refrigerant pipe temperature detecting means. And means.
The control device for an air conditioner as described in the above. 7. The air conditioner according to claim 1, further comprising: means for detecting an operating current of the compressor; and means for judging an erroneous connection of a power supply having a rated voltage or less based on the operating current. Machine control device. 8. A means for switching between a cooling operation and a heating operation, a pipe temperature detecting means for detecting a pipe temperature, and a pipe temperature detected by the pipe temperature detecting means at a normal power supply voltage determined in advance. Means for judging an erroneous connection of a power supply having a rated voltage or less by comparing with a control voltage of the air conditioner. 9. The control device for an air conditioner according to claim 2, further comprising means for stopping the operation of the compressor when the power supply voltage is a different voltage. 10. The control device for an air conditioner according to claim 2, further comprising means for displaying a result of the determination of the power supply voltage.