JP2000121135A - Controller for air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To operate an air conditioner continuously with low capacity even if power supply voltage is dropped by limiting the frequency of a compressor and a fan to a lower level as compared with normal operation when power supply voltage drop is detected. SOLUTION: Power supply 31 of the controller for an air conditioner is connected with a current detector 51 and a voltage detector 52 which deliver detected AC current and AC voltage to an indoor controller 54 having an MCU (microcomputer unit) 53. The indoor controller 54 is connected with an outdoor unit 56 having an MCU 55 through an interconnecting line 57 in order to communicate information between them. The voltage detector 52 comprises two voltage detectors detecting a voltage higher than a specified level and a voltage lower than the specified level, respectively, and delivering a detection signal to the MCU 53 of the indoor controller 54. According to the arrangement, the air conditioner can be operated continuously even if power supply voltage is dropped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] The present invention relates to an air conditioner control device that continuously operates an air conditioner when a power supply voltage drops or the like.

[0002] The present invention also relates to a control device for an air conditioner which reduces discomfort when a power supply voltage is lowered.

[0003]

2. Description of the Related Art Generally, a split type air conditioner 1 is disclosed.
Numeral 0 includes an outdoor unit 11 installed in an outdoor OD, an indoor unit 13 installed on a wall 12 having an indoor ID, and a connecting pipe 14 connecting these units, as shown in FIG.

[0004] The air conditioner 10 is provided with a refrigeration cycle and electric parts as shown in FIG.
Refrigeration cycle components such as the four-way solenoid valve 16, the outdoor heat exchanger 17, and the decompressor 21 and electric components such as the outdoor blower 18 are provided in the outdoor unit 11, and refrigeration cycle components such as the indoor heat exchanger 19 and the indoor blower are provided. Electrical components such as 20 are provided in the indoor unit 13.

The four-way solenoid valve 16 includes a DC power supply type and an AC power supply type. Recently, as shown in FIG. 15, an AC power supply type which does not require a rectifying device or a constant voltage device and has a low cost is widely used. are doing.

[0006] Generally, the four-way solenoid valve 16 is mounted on the compressor 1.
The four-way solenoid valve 16 and the outdoor heat exchanger 1
7, during a refrigerating operation in which the refrigerant is circulated to the compressor 15 via the decompressor 21, the indoor heat exchanger 19, and the four-way solenoid valve 16, the electromagnetic coil 16a is kept in a non-energized state, and the refrigerant compressed by the compressor 15 At the time of heating operation circulating to the compressor 15 via the electromagnetic valve 16, the indoor heat exchanger 19, the decompressor 21, the indoor heat exchanger 17, and the four-way electromagnetic valve 16, the electromagnetic coil 1
6a is switched to the energized state, and the refrigeration cycle is maintained by the switching force.

The air conditioner 10 is provided with a control device 30 as shown in FIG.
0, the outdoor blower 18 and the like are controlled.

[0008] The control device 30 is connected to a power supply 31, a reactor 32, a rectifier 33, and a smoothing capacitor 34 in order, so as to convert AC power into DC power. Inverters 35, 36, and 37, each of which is a bridge-connected semiconductor switching circuit, are connected to the smoothing capacitor 34 that has become the DC power, and the variable-frequency AC power is supplied to the compressor 15, the indoor blower 20, the outdoor blower 18, and the like. Supply.

[0009] A transformer 38 is connected to the power supply 31 so as to reduce the power supply voltage. The electromagnetic coil 16a of the four-way solenoid valve 16 is connected to the transformer 38 via a relay 39, so that the refrigeration cycle cycle is set to the cooling operation state when not energized, and the refrigeration cycle is switched to the heating operation state when energized. I have.

A microcomputer unit (MCU) 4 provided in the outdoor unit 11 of the control device 30
The outdoor control device 41 having 0 or the like includes a sensor 4 such as an external temperature sensor and a discharge temperature sensor attached to the outdoor heat exchanger 17.
The variable frequency supplied to the compressor 15 and the outdoor blower 18 is controlled by the detection data of No. 2, and the switching control of the four-way solenoid valve 16 is performed.

The indoor unit 13 is provided with an indoor control device 44 having a microcomputer unit (MCU) 43 and the like, and detects data of a sensor 45 such as a temperature sensor and a humidity sensor attached to the indoor heat exchanger 19. Controls the variable frequency supplied to the indoor blower 20.

[0012]

The outdoor control device 41 and the indoor control device 44 of such a control device for an air conditioner.
When the power supply voltage is 200 V, the data of the sensors 42 and 45 are subjected to arithmetic processing and a normal control signal is generated.

The inverter devices 35, 36, 37, etc. receiving the normal control signal generate a predetermined variable frequency according to the control signal, variably drive the compressor 15, etc., and
9 is cooled for cooling operation or heated for heating operation.

In such an air conditioner, if the power supply voltage drops to 170 V or abnormally drops to 140 V for some reason, the compressor 15 or the like may not only be inoperable but also reduce the air conditioning capacity. In order to prevent this, the conventional apparatus stops the operation of the air conditioner when the power supply voltage drops abnormally.

As a result, the room temperature rises or falls suddenly, which sometimes gives the user a very uncomfortable feeling.

If the power supply voltage drops or abnormally drops during the heating operation, the electromagnetic coil 16a of the four-way solenoid valve 16 loses its holding power and may return to the cooling operation. If the operation is continued in this returned state, the air conditioner 10 is in a cooling cycle, and the heating expected by the user cannot be obtained, which may give a great discomfort.

It is an object of the present invention to provide a control device for an air conditioner in which the air conditioner can be continuously operated with low power and low capacity even if the power supply voltage is lowered.

It is another object of the present invention to provide a control device for an air conditioner which does not cause a user to feel uncomfortable when a power supply voltage decreases during a heating operation.

[0019]

According to a first aspect of the present invention, there is provided a control device for an air conditioner which variably drives a compressor and a blower by controlling the energization of a variable frequency. An object of the present invention is to provide a control device for an air conditioner, wherein the frequency is limited to a value lower than that during normal operation.

According to a second aspect of the present invention, there is provided a control device for an air conditioner in which a compressor and a blower are variably driven by variable frequency energization control, wherein the frequency of the compressor is set to a value lower than that in the normal operation when the power supply voltage is reduced. The present invention provides an air conditioner control device characterized in that the air blower is stopped at predetermined time intervals or the frequency is reduced at predetermined time intervals.

Further, the invention according to claim 3 is characterized in that the fluctuation range of the power supply voltage is detected in a plurality of stages, and the maximum allowable frequency limit value is provided in a plurality of stages corresponding to the decrease of the power supply voltage. It is intended to provide a control device for a harmonic machine.

Further, the invention of claim 4 provides a control device for an air conditioner, wherein the operation of the compressor and the blower is stopped when the power supply voltage has been continuously lowered for a predetermined time.

Furthermore, the invention of claim 5 provides a control device for an air conditioner, characterized by detecting a drop in the power supply voltage and detecting again the power supply voltage for operating the compressor and the blower after operating for a predetermined time. Things.

Further, according to a sixth aspect of the present invention, in a control device for an air conditioner that variably drives a compressor and a blower by variable-frequency energization control, when the decrease in power supply voltage is detected, the duty ratios of the compressor and the blower are reduced. An object of the present invention is to provide a control device for an air conditioner, which is characterized in that the control is reduced.

Further, according to the invention of claim 7, the compressor, the four-way solenoid valve, the outdoor heat exchanger, the decompressor, and the indoor heat exchanger are sequentially connected by piping, and the four-way solenoid valve is turned on or off. By switching between the cooling operation and the heating operation, the controller of the air conditioner that variably drives the compressor and the blower at a variable frequency detects a drop in the power supply voltage while the air conditioner is stopped, It is an object of the present invention to provide a control device for an air conditioner, wherein starting of a compressor is prohibited in an operation mode in which a solenoid valve is energized.

Further, according to the invention of claim 8, a compressor, a four-way solenoid valve, an outdoor heat exchanger, a decompressor, and an indoor heat exchanger are sequentially connected by piping, and the heating operation is performed when the four-way solenoid valve is energized. In addition, in the control device of the air conditioner that variably drives the compressor and the blower with the variable frequency, when the decrease of the power supply voltage is detected during the heating operation, while the temperature of the indoor heat exchanger is in a low-temperature release region below a predetermined value. The present invention provides an air conditioner control device characterized by limiting command frequencies of a compressor and an indoor blower to low values.

Further, according to the ninth aspect of the present invention, the compressor, the four-way solenoid valve, the outdoor heat exchanger, the pressure reducer, and the indoor heat exchanger are sequentially connected by piping, and the heating operation is performed when the four-way solenoid valve is energized. In addition, in the control device of the air conditioner that variably drives the compressor and the blower with the variable frequency, the control unit detects a drop in the power supply voltage at the time of starting the heating operation, and when the temperature of the outdoor heat exchanger is in a high temperature region of a predetermined value or more. It is an object of the present invention to provide an air conditioner control device characterized in that the operation of a compressor is prohibited during a certain period.

Further, according to a tenth aspect of the present invention, when the command frequency for restarting the compressor is equal to or less than a predetermined value and the four-way solenoid valve is energized, the compressor is compressed with a set value larger than the predetermined value set in advance. The present invention provides a control device for an air conditioner, wherein the control frequency is reduced to the command frequency after the air conditioner is operated for a predetermined time.

Further, the invention of claim 11 is a compressor,
A four-way solenoid valve, an outdoor heat exchanger, a decompressor, and an indoor heat exchanger are sequentially connected by piping, and a compressor and a blower are variably driven by variable-frequency energization control. A control device for an air conditioner, comprising: a normal power supply voltage electromagnetic coil and an abnormally low power supply voltage electromagnetic coil used when the voltage is lower than a normal power supply voltage. is there.

Further, the invention according to claim 12 is characterized in that the electromagnetic coil is changed into a normal power supply voltage electromagnetic coil or an abnormally reduced power supply voltage electromagnetic coil by changing the number of windings by switching taps. It is intended to provide a control device for a harmonic machine.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a control device for an air conditioner according to the present invention will be described below with reference to the drawings.

Since the control device 50 of the air conditioner of the present invention is basically constructed in substantially the same manner as the control device 30 of the conventional air conditioner, the same parts are denoted by the same reference numerals and detailed description is omitted. Will be explained.

The power supply 31 of the control device 50 of this air conditioner
As shown in FIG. 1, a current detecting device 51 and a voltage detecting device 52 are connected to each other, and the AC current and the AC voltage detected by these devices are supplied to an indoor control device 54 having a microcomputer unit (hereinafter referred to as MCU) 53. To be sent.

An outdoor control unit 56 having a microcomputer unit (hereinafter referred to as MCU) 55 is connected to the indoor control unit 54 through a communication line 57 such as a power line and a communication line (not shown). The information is sent to the outdoor controller 56 and the information of the outdoor controller 56 is sent to the indoor controller 54.

The voltage detector 52 includes two voltage detectors 60a and 60a as shown in FIG.
0b is provided. This voltage detector 60a has 170
A voltage exceeding V (hereinafter referred to as "A1" voltage) and a voltage lower than V (hereinafter referred to as "dropped voltage") are detected separately, and this detection signal is sent to the MCU 53 of the indoor control device 54. ing. Similarly, the voltage detector 60b distinguishes between a voltage exceeding 140V (hereinafter referred to as “A2” voltage) and a voltage lower than this (hereinafter referred to as “abnormally reduced voltage”). MCU5 of device 54
3.

In the voltage detector 60a, a zener diode 62a is connected in parallel with the diode 61a to the photodiode 64a of the photocoupler 63a. When a voltage exceeding A1 is applied, the zener diode 62a is turned on. This is made non-conductive.

When the voltage of the Zener diode 62a exceeds the voltage A1 from the reduced voltage, the voltage does not reach 173V (hereinafter referred to as "release voltage of A1 + δ value"). It has become. This prevents erroneous operation due to micro-vibration and instantaneous power supply voltage chattering.

The zener diode 62a is connected to a photodiode 64a of a photocoupler 63a.
Light is emitted when the Zener diode 62a is turned on, and is not emitted when the Zener diode 62a is turned off.

The photodiode 64a is provided with a phototransistor 65a, which is a light receiving element, at intervals. The light is emitted from the photodiode 64a to make it conductive, and if no light is emitted, it becomes non-conductive.

A transistor 66a is connected to the phototransistor 65a of the photocoupler 63a. The transistor 66a is turned on when the phototransistor 65a is turned on, and is turned off when the phototransistor 65a is turned off. .

The indoor control device 5 is connected to the transistor 66a.
4 is connected, and when this is non-conductive, the MCU 53
Sends a signal "1" indicating that it is equal to or greater than A1. When the signal is conductive, a signal "0" indicating that the signal is less than A1 is sent to the MCU 53.

The voltage detector 60b includes a voltage detector 6
It is configured similarly to Oa and operates almost the same, except that the Zener diode 62b is conductive when the voltage is A2, and is non-conductive when the voltage is abnormally lower than A2.

As described above, the voltage detecting device 52 can detect the fluctuation range of the power supply voltage in a plurality of steps, and the indoor control device 54 and the outdoor control device 56, which will be described later, determine the control value of the maximum allowable frequency. A plurality are provided corresponding to the amount of decrease in the power supply voltage.

Although not shown, the MCU 53 of the indoor control unit 54 includes an arithmetic processing unit, a timer device, a remote control receiver, and other various programs.
Command signals, data, information, and the like from the sensor 60b, the sensor 45, the indoor control device 54, and the like are received, processed, and the inverter device 37 and the like are controlled.

Although not shown, the MCU 55 of the outdoor control device 56 is provided with an arithmetic processing unit, a timer device, various programs, and the like. The temperature sensor 42 of the outdoor heat exchanger 17, a command signal from the indoor control device 54, and the like, data, Information and the like are received and arithmetically processed to control the inverter devices 35 and 36 and the like.

When the MCU 53 receives the detection signal "1" from each of the voltage detectors 60a and 60b, the power supply voltage is determined to be a normal power supply voltage, and the inverter devices 35, 36, 3
A control signal for controlling the control signal 7 to the normal command frequency is generated.

As shown in FIG. 3, the frequency range is from 0 Hz to 1 as shown in FIG.
An energizing pulse having a variable frequency of 30 Hz (hereinafter referred to as "α1") which is not restricted at all is generated. Similarly, the frequency range from the inverter devices 36 and 37 is 0 Hz as shown in FIG.
5 to 130 Hz (hereinafter referred to as "β1"), and generates an energizing pulse of a variable frequency which is not limited at all.
% (Hereinafter, referred to as “γ1”).

Here, when the MCU 53 receives the detection signal "0" from the voltage detector 60a and the detection signal "1" from the voltage detector 60b, it is determined that the voltage of the power supply 31 is a reduced voltage of A1 or less and A2 or more. , And a suppression control signal to the inverter device 35.

The frequency range of the command frequency from the inverter device 35 which has received the suppression control signal is limited to 0 Hz to 60 Hz (hereinafter referred to as "α2") as shown in FIG. An energizing pulse of a variable frequency is generated, and similarly, the inverter devices 36 and 37 output signals shown in FIG.
As shown in the figure, the frequency range is from 0 Hz to 90 Hz (hereinafter "β2").
5), and the duty ratio of each inverter device 35 etc. is limited to 0% to 70% (hereinafter referred to as “γ2”) as shown in FIG. 5. Is performed.

When the MCU 53 receives the detection signal "0" from the voltage detectors 60a and 60b, it is determined that the voltage of the power supply 31 is an abnormally low voltage lower than A2, and
An abnormality suppression control signal is generated at 5, 36, and the like.

The frequency range is restricted to zero as shown in FIG. 3 from the inverter device 35 which has received the abnormality suppression control signal. Similarly, the command frequency range is controlled from the inverter devices 36 and 37 as shown in FIG. Is from 0 Hz to 50 Hz (hereinafter “β
3) is generated, and the duty ratio of each inverter device 35 and the like is reduced to 0% to 50% (hereinafter referred to as "γ3") as shown in FIG. It has become.

A control example of the control device 50 of the air conditioner will be described with reference to a flowchart shown in FIG. First, when the power supply voltage is a normal voltage exceeding 170 V of A1 when the air conditioner 10 is in the cooling operation, as shown in FIG.
A detection signal is detected from each of 0a and 60b (S1).

When any of the detection signals is "1", the MCU 5
3, a normal control signal is generated, and the inverter device 35 and the like generate energizing pulses in the normal variable frequency ranges α1, β1 at the normal energizing rate γ1.

For this reason, the inverter device 35 and the like operate the compressor 16, the outdoor blower 18, and the indoor blower 20 without any restrictions according to the data received by the indoor control device 54 and the outdoor control device 56, and the normal variable frequency ranges α 1 and β 1 The indoor ID can be cooled under comfortable conditions by variably driving with the normal duty ratio γ1.

However, when the power supply voltage drops for some reason, this is detected by the voltage detectors 60a and 60b (S2).

Due to this reduced voltage, the MCU 53 receives the detection signal “0” from the voltage detector 60a, receives the detection signal “1” from the voltage detector 60b, and based on the detection signal, the MCU 5
3 generates a suppression control signal.

The outdoor control unit 55 is controlled by this suppression control signal.
The variable frequency range of the inverter device 35 is limited to α2 and the duty ratio is limited to γ2 via the MCU 56, and the compressor 15 is variably driven at a speed more limited than usual by the limited value. Similarly, the inverter device 37 is connected to the MCU 5
3, the inverter device 36 receives the suppression control signal from the MCU 55 and limits the variable frequency range to β2 and the duty ratio to γ2, thereby variably driving the indoor blower 20 and the outdoor blower 18 at a speed lower than normal (S3). ), (S4), (S
5), (S6).

Therefore, the inverter device 35 and the like operate the compressor 16, the outdoor blower 18, and the indoor blower 20 with low power and low air conditioning capacity based on data received by the indoor control device 54 and the outdoor control device 56. Although this air conditioning cannot be satisfied, the cooling of the room ID can be continued within a range that does not cause excessive discomfort.

Further, when the power supply voltage drops to an abnormally low voltage, the MCU 53 receives a detection signal "0" from any of the voltage detectors 60a and 60b as shown in FIG. 7 (S1).
1).

For this reason, an abnormality suppression control signal is generated from the MCU 53, and the inverter device 35 receives this signal, and the variable frequency is zero, that is, the compressor 15 is stopped (S1).
2), the inverter devices 36 and 37 have a variable frequency range β2,
Variable drive with reduced capacity based on duty ratio γ2 (S1
3).

That is, the compressor 15 is stopped, the indoor and outdoor blowers 20 and 18 are driven with very low electric power, and the ventilation and air conditioning with controlled residual heat is performed. By this ventilation air conditioning, it is possible to protect the equipment of the control device by suppressing an excessive rise in the use current, and further, it is possible to reduce the discomfort caused by the stagnation of the high-temperature air.

The power supply voltage drop or abnormal drop may occur instantaneously or may take a long time. In order to operate the air conditioner 10 smoothly, the above control is performed only when the low voltage or the abnormal low voltage continues for a long time. This control example will be described with reference to FIG.

When the power supply voltage drops, a timer is set and counts up (S1), (S2), and (S21). If the timer counts up from 60 to 120 and the power supply voltage maintains the reduced voltage, the compressor 15 is variably driven at the reduced speed (S22), (S23), (S24), and (S25).

When the power supply voltage drops abnormally, a timer is set and count-up is performed (S26), (S27) and (S28). If the timer counts up from 60 to 120 and the power supply voltage maintains the abnormally low voltage, the compressor 15 is stopped,
The outdoor blower 18 and the indoor blower 20 are variably driven at a reduced speed (S29), (S30), (S31), and (S32).

When the power supply voltage or the abnormal drop has occurred in this way, these controls are performed so that the operation of the air conditioner 10 can be performed smoothly.

When the power supply voltage drops or abnormally drops when or when the air conditioner 10 is in the heating operation, the holding power of the electromagnetic coil 16a of the four-way solenoid valve 16 switched to the heating side decreases, and the cooling operation side May be returned to If the heating operation is performed in this state, the room ID is cooled and the user may be very uncomfortable.

Hereinafter, when performing the heating operation, the air conditioner 10 will be described.
FIG. 9 shows a means for reducing discomfort caused by the cooling operation performed by the user.
It will be described with the like.

It is detected whether the power supply voltage has dropped or abnormally dropped during the heating operation (S41), (S42). When the pressure is reduced or abnormally reduced, the compressor 15 is subjected to the suppression control or the abnormality suppression control and the energizing mode of the four-way solenoid valve 16, that is, whether or not the operation is switched to the heating operation, and whether or not the compressor 15 is stopped. Are detected (S43), (S44), and (S45). When the compressor 15 stops in the energizing mode with the four-way solenoid valve 16 detected by this detection, the holding power of the four-way solenoid valve 16 becomes weak due to a decrease in the power supply voltage, and the compressor 15 may be returned to the cooling side. Is prohibited (S46).

Thereafter, the detection of the power supply voltage eliminates the power supply voltage drop or the abnormal drop, and the prohibition of restarting the compressor 15 is released and restarted (S47) and (S48).

Thus, during the heating operation, the four-way solenoid valve 1
6 prevents the cooling cycle from going against the user's expectation due to the decrease in the holding power of the electromagnetic coil 16a.

As a means for preventing a cooling cycle from occurring during the heating operation when the power supply voltage is reduced, when the temperature of the indoor heat exchanger 19 is equal to or higher than a predetermined value when the compressor 15 is stopped due to an abnormal decrease in the power supply voltage. There is a method of prohibiting the restart of the compressor 15 and preventing the cooling cycle operation during the heating operation. This prevention means will be described with reference to FIG. After the power supply voltage drops abnormally and the compressor 15 is stopped, the indoor heat exchanger 1
It is detected whether or not the temperature in Step 9 is in a low-temperature release region below a predetermined value (S41), (S42), (S43), and (S51).

By this detection, the indoor heat exchanger 19 is
According to the detection data of No. 5, the operation is continued without being in the low-temperature release region, and the compressor 1 is not in the low-temperature release region.
It is detected whether or not 5 is stopped (S52). If the detection indicates that the region is the low-temperature release region and the compressor 15 is stopped, the restart of the compressor 15 is prohibited (S53).

Thereafter, when the power supply voltage is detected and the drop in the power supply voltage or abnormal drop is eliminated and the four-way solenoid valve 16 returns to the state where it can be switched to the heating operation side by energizing the electromagnetic coil 16a, the heating operation is performed. The stop of the compressor 15 is continued (S53), (S54).

As described above, the temperature of the indoor heat exchanger 19 during the heating operation is determined based on the detection data of the sensor 45 by using the four-way solenoid valve 1.
It is possible to grasp the switching state of No. 6 and not perform the operation in the cooling cycle during the heating operation.

Note that the compressor 15 may be stopped when the temperature of the outdoor heat exchanger 17 is equal to or higher than a predetermined value instead of the temperature of the indoor heat exchanger 19 of the above embodiment.

When the compressor 15 is stopped, there is a method of detecting whether the temperature of the outdoor heat exchanger 17 after the completion of defrosting is equal to or higher than a predetermined value, and preventing the cooling cycle operation of the air conditioner 10. This prevention means will be described with reference to FIG.

With the power supply voltage lowered and the frequency of the compressor 15 reduced, the four-way solenoid valve 16 is switched to the cooling side in the non-energizing mode, the indoor blower 20 is stopped, and the defrosting operation of the outdoor heat exchanger 19 is started. (S41), (S4
2), (S43), (S61).

With this detection, a defrosting operation for defrosting the outdoor heat exchanger 17 is performed, and whether or not the operation has been completed is determined by the detection data received from the sensor 42 provided in the outdoor heat exchanger 17. The operation state of the outer heat exchanger 17 is detected.
If the temperature of the outdoor heat exchanger 17 has not risen by this detection, the defrosting operation is continued, and if the temperature has risen, the compressor 15
Stop and prohibit restart (S62), (S63), (S6
4), (S65).

After that, if the power supply voltage drop is resolved by the detection of the power supply voltage and the four-way solenoid valve 16 is switched to the heating operation side by energizing the electromagnetic coil 16a, the prohibition of the restart of the compressor 15 is released and the heating is stopped. Return to operation (S66).

As described above, in the above embodiment, the four-way solenoid valve 16
Consider the possibility that the power supply voltage drops in the defrosting operation in which the four-way solenoid valve 16 is in the non-energizing mode and the four-way solenoid valve 16 is returned to the cooling side because the holding power of the four-way solenoid valve 16 is weak even if the heating operation is performed with the four-way solenoid valve 16 set As a result, operation in the cooling cycle is prevented beforehand.

In the above embodiment, the power supply voltage is 17
The case where the air conditioner 10 is continuously operated when the voltage drops to 0 V or less and abnormally drops to 140 V has been described. However, the power supply voltage is reduced by five, seven, regardless of the two voltage detectors 60a and 60b.
When the variable frequency range is gradually increased and the variable frequency range is subdivided, the control for suppressing the fine adjustment can be performed. Thereby, discomfort of the user can be reduced.

Further, it is also possible to take measures such as stopping the blower at a predetermined time interval when the power supply voltage decreases or operating an inverter device for reducing the frequency.

Further, regarding the four-way solenoid valve 16, FIG.
As shown in FIG.
If the electromagnetic coil 16a2 having a large number of turns is used for the reduced voltage or abnormally reduced voltage using the 6a1, the holding force can be increased at the time of the reduced voltage or the abnormally reduced voltage, and the cooling cycle can be prevented from returning during the heating operation.

Further, the electromagnetic coil 16 of the four-way solenoid valve 16
It is possible to prevent a return to the cooling cycle during the heating operation by adjusting the holding force of the electromagnetic coil 16a by taking out a number of turns from the tap corresponding to the drop or abnormal drop from the multi-turn electromagnetic coil.

Various changes may be made without departing from the spirit of the present invention.

[0086]

According to a first aspect of the present invention, there is provided an air conditioner control device for an air conditioner in which a compressor and a blower are variably driven by variable frequency energization control. Is limited to a value lower than that during normal operation, so that the air conditioner can be continuously operated even if the power supply voltage drops or abnormally drops.

According to the second aspect of the present invention, when the power supply voltage is reduced, the frequency of the compressor is limited to a low value, and the blower is stopped at a predetermined frequency or the frequency is reduced. Can drive.

According to a sixth aspect of the present invention, in a control device for an air conditioner in which a compressor and a blower are variably driven by variable-frequency energization control, when the power supply voltage drops, the duty ratio is limited. The air conditioner can be continuously operated even if the air conditioner decreases or abnormally decreases.

According to a seventh aspect of the present invention, when the power supply voltage decreases,
When the four-way solenoid valve is in the energized mode of operation, the restart of the compressor is prohibited, so that operation contrary to the operation mode required by the user can be prevented.

According to the eighth and ninth aspects of the invention, when the power supply voltage decreases, it is used to detect whether or not the four-way solenoid valve is in the set operation mode from the temperature change of the indoor heat exchanger or the outdoor heat exchanger. Driving that does not meet the requirements of the driver can be prevented.

According to the eleventh aspect of the present invention, since the four-way solenoid valve is provided with the abnormally low voltage solenoid coil, the cooling / heating cycle is reliably switched in the operation mode in which the four-way solenoid valve is energized even when the power supply voltage drops. be able to.

[Brief description of the drawings]

FIG. 1 is an electric block diagram showing an outline of an air conditioner control device of the present invention.

FIG. 2 is an electric block diagram showing an outline of the voltage detection device of FIG. 1;

FIG. 3 is an explanatory diagram illustrating an example of control for suppressing the frequency of the compressor and abnormality suppression control.

FIG. 4 is a control for suppressing frequencies of an indoor blower and an outdoor blower.
Explanatory drawing which shows an example of abnormality suppression control.

FIG. 5 is an explanatory diagram showing an example of control for suppressing the duty ratio of the compressor and the like, and control for abnormality suppression.

FIG. 6 is a flowchart showing the operation of FIG. 1;

FIG. 7 is another flowchart showing the operation of FIG. 1;

FIG. 8 is still another flowchart showing the operation of FIG. 1;

FIG. 9 is still another flowchart showing the operation of FIG. 1;

FIG. 10 is still another flowchart showing the operation of FIG. 1;

FIG. 11 is still another flowchart showing the operation of FIG. 1;

FIG. 12 is a schematic view showing an example of a four-way solenoid valve of the air conditioner of the present invention.

FIG. 13 is a side view showing an outline of a generally used split-type air conditioner.

FIG. 14 is an explanatory view showing an outline of a refrigeration cycle of a commonly used air conditioner.

FIG. 15 is a schematic view showing an example of a four-way solenoid valve of a conventional air conditioner.

FIG. 16 is an electric block diagram showing an outline of a conventional air conditioner control device.

[Explanation of symbols]

Reference Signs List 10 air conditioner 11 outdoor unit 13 indoor unit 15 compressor 16 four-way solenoid valve 17 outdoor heat exchanger 18 outdoor blower 19 indoor heat exchanger 20 indoor blower 30, 50 air conditioner control device 35, 36, 37 inverter device 40, 43, 53, 55 Microcomputer unit (MCU) 41, 56 Outdoor controller 42 Sensor 44, 54 Outdoor controller 52 Voltage detector 57 Connecting line 60a, 60b Voltage detector 61a, 61b Diode 62a, 62b Zener diode 63a, 63b Phototransistor 66a, 66b Transistor

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yui Igarashi, 336 Tatehara, Fuji, Shizuoka Prefecture, Toshiba Fuji Plant (72) Inventor Yasushi Yasashi 336 Tatehara, Fuji City, Shizuoka Prefecture, Toshiba Fuji Plant (72) Inventor Shingo Igawa 336 Tatehara, Fuji-shi, Shizuoka Prefecture Inside Toshiba Fuji Plant (72) Inventor Shoichiro Shirakawa 336 Tatehara, Fuji City, Shizuoka Prefecture Inside Toshiba Fuji Plant (72) Inventor Hiroyoshi Morimoto Tokyo Metropolitan Port (72) Inventor Akihiko Kubono 3-3-9, Shimbashi, Minato-ku, Tokyo Toshiba A-V EE Co., Ltd. ) Inventor Yukio Obana 3-3-9, Shimbashi, Minato-ku, Tokyo F-term in Toshiba AV EE Corporation (reference) 3L060 AA02 CC04 CC08 CC19 DD01 DD02 EE04 EE05 EE06 EE 10 3L061 BA07 BE01 BE02 BF04 BF06 BF08

Claims (12)

[Claims] An air conditioner control device for variably driving a compressor and a blower by variable-frequency energization control, wherein when a decrease in power supply voltage is detected, the frequency of the compressor and the blower is limited to a value lower than that during normal operation. A control device for an air conditioner, comprising: 2. A control device for an air conditioner that variably drives a compressor and a blower by means of variable frequency energization control, wherein when the power supply voltage is reduced, the frequency of the compressor is limited to a lower value than during normal operation, and the blower is operated. A control device for an air conditioner, characterized by stopping at a predetermined time interval or decreasing a frequency at a predetermined time interval. 3. The air conditioner according to claim 1, wherein a fluctuation range of the power supply voltage is detected in a plurality of stages, and a maximum allowable frequency limit value is provided in a plurality of stages corresponding to a decrease in the power supply voltage. Machine control device. 4. The control device for an air conditioner according to claim 1, wherein the operation of the compressor and the blower is stopped when the power supply voltage drops for a predetermined time. 5. The control device for an air conditioner according to claim 1, wherein a decrease in the power supply voltage is detected, and after a predetermined time of operation, the power supply voltage for operating the compressor and the blower is detected again. 6. A control device for an air conditioner that variably drives a compressor and a blower by means of variable-frequency energization control, wherein when a decrease in power supply voltage is detected, the duty ratio of the compressor and the blower is reduced. Control device for air conditioner. 7. A cooling operation and a heating operation by connecting a compressor, a four-way solenoid valve, an outdoor heat exchanger, a decompressor, and an indoor heat exchanger in sequence by piping and turning on or off the four-way solenoid valve. In the control device of the air conditioner that switches the compressor and the blower variably with the variable frequency while detecting the drop of the power supply voltage while the air conditioner is stopped, and
A control device for an air conditioner, wherein starting of a compressor is prohibited in an operation mode in which a four-way solenoid valve is energized at that time. 8. A compressor, a four-way solenoid valve, an outdoor heat exchanger, a decompressor, and an indoor heat exchanger are sequentially connected by piping, and when the four-way solenoid valve is energized, a heating operation is performed. In the control device of the air conditioner variably driven by the variable frequency, when the temperature of the indoor heat exchanger is in a low-temperature release region where the temperature of the indoor heat exchanger is equal to or less than a predetermined value when a decrease in the power supply voltage is detected during the heating operation, the compressor and the indoor blower are controlled. A control device for an air conditioner, wherein a command frequency is limited to a low value. 9. A compressor, a four-way solenoid valve, an outdoor heat exchanger, a decompressor, and an indoor heat exchanger are sequentially connected by piping to perform heating operation when the four-way solenoid valve is energized and to change a compressor and a blower. A control device for an air conditioner variably driven by a frequency detects a decrease in the power supply voltage at the time of starting the heating operation, and operates the compressor while the temperature of the outdoor heat exchanger is in a high temperature region equal to or higher than a predetermined value. A control device for an air conditioner, wherein the control is prohibited. 10. When the command frequency in restarting the compressor is equal to or lower than a predetermined value and the four-way solenoid valve is energized, the compressor is operated for a predetermined time at a set value larger than the predetermined value set in advance. The control device for an air conditioner, wherein the control frequency is reduced to the command frequency after the start. 11. A compressor, a four-way solenoid valve, an outdoor heat exchanger, a decompressor, and an indoor heat exchanger are sequentially connected by piping, and the compressor,
In a control device for an air conditioner that variably drives a blower with variable frequency energization control, a four-way solenoid valve has a normal power supply voltage solenoid coil and an abnormally low power supply voltage used when the voltage drops below the normal power supply voltage. A control device for an air conditioner, comprising: an electromagnetic coil for use in an air conditioner. 12. The air conditioner according to claim 11, wherein the electromagnetic coil is changed into a normal power supply voltage electromagnetic coil or an abnormally reduced power supply voltage electromagnetic coil by changing the number of windings by switching taps. Machine control device.