KR102158184B1 - Method of controlling air conditioner - Google Patents

Abstract

In the control method of an air conditioner according to an embodiment of the present invention, the operation of the compressor is started according to a predetermined operation mode, the power consumption of the compressor is determined, and the power consumption is greater than the first reference value and less than the second reference value. , Determining whether the fluctuation of the operating frequency of the compressor during the first period is within the reference range, and when the fluctuation of the operating frequency of the compressor during the first period is within the reference range, the first consumption, which is the average value of power consumption during the second period Calculating an average power value, inverting a state of the power factor correcting unit from a first state to a second state, calculating a second average power consumption value that is an average power consumption value for two periods in the second state, and If the first average power consumption value is not greater than the second average power consumption value, the step of inverting the state of the power factor corrector from the second state to the first state may be included.

Description

Control method of air conditioner {METHOD OF CONTROLLING AIR CONDITIONER}

The present invention relates to an air conditioner and a control method thereof, and more particularly, to an air conditioner capable of efficiently performing power factor compensation and a control method thereof.

The air conditioner is installed to provide a more comfortable indoor environment to humans by discharging cold and hot air into the room to create a pleasant indoor environment, adjusting the indoor temperature, and purifying the indoor air. In general, an air conditioner includes an indoor unit configured with a heat exchanger and installed indoors, and an outdoor unit configured with a compressor and a heat exchanger to supply refrigerant to the indoor unit.

In general, electronic devices such as air conditioners are provided with a power conversion device and are operated by converting input power.

In this case, there have been attempts to improve stability by applying hysteresis control to the control of the power conversion device.

For example, prior art 1 (Korean Patent Laid-Open Publication No. 10-2016-0133599, publication date November 23, 2016), power conversion that implements fast response characteristics while maintaining low power consumption and stability of the output voltage. It aims to provide a device and a hysteresis buck converter.

Air conditioners often include a power factor correction (PFC) for converting reactive power into active power in consideration of the characteristics of the AC power supply voltage.

Hysteresis control can be applied to power factor compensation control to increase stability by preventing frequent on/off of the power factor correction unit.

In this case, the stability is improved according to the hysteresis control, but there is a problem that the power factor correction efficiency of the power factor correcting unit decreases.

An object of the present invention is to provide an air conditioner capable of efficiently performing power factor compensation and a control method thereof.

It is an object of the present invention to provide an air conditioner and a control method thereof in which an outdoor unit can always be operated at the highest efficiency condition.

In the control method of an air conditioner according to an embodiment of the present invention for achieving the above object, the operation of the compressor is started according to a predetermined operation mode, the step of determining the power consumption of the compressor, and the power consumption is less than a first reference value. If it is larger and less than the second reference value, determining whether the fluctuation of the operating frequency of the compressor during the first period is within the reference range, and when the fluctuation of the operating frequency of the compressor during the first period is within the reference range, consumption during the second period Calculating a first average power consumption value that is an average power value, inverting a state of the power factor correction unit from a first state to a second state, calculating a second average power consumption value that is an average power consumption value for two periods in the second state And, if the first average power consumption value is not greater than the second average power consumption value, inverting the state of the power factor corrector from the second state to the first state.

According to at least one of the embodiments of the present invention, power factor compensation can be efficiently performed.

Further, according to at least one of the embodiments of the present invention, the outdoor unit can always be operated under the highest efficiency condition.

Meanwhile, other various effects will be directly or implicitly disclosed in the detailed description according to the embodiments of the present invention to be described later.

1 is a diagram illustrating a configuration of an air conditioner according to an embodiment of the present invention.
2 is a schematic diagram of the outdoor unit and the indoor unit of FIG. 1.
3 is a simplified internal block diagram of a compressor driving device provided in the air conditioner of FIG. 1.
4 and 5 are diagrams referred to for explanation of hysteresis control of a power factor correction unit.
6 is a flowchart of a control method of an air conditioner according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, it goes without saying that the present invention is not limited to these embodiments and may be modified in various forms.

In the drawings, in order to clearly and briefly describe the present invention, the illustration of parts not related to the description is omitted, and the same reference numerals are used for identical or extremely similar parts throughout the specification.

Meanwhile, the suffixes "module" and "unit" for the constituent elements used in the following description are given in consideration of only ease of writing in the present specification, and do not impart a particularly important meaning or role by themselves. Therefore, the "module" and "unit" may be used interchangeably with each other.

In addition, in this specification, terms such as first and second may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.

1 is a diagram illustrating a configuration of an air conditioner according to an embodiment of the present invention.

Referring to FIG. 1, an air conditioner 100 according to the present invention may include an indoor unit 21 and an outdoor unit 31 connected to the indoor unit 21.

The indoor unit 21 of the air conditioner is applicable to any of a stand type air conditioner, a wall-mounted type air conditioner, and a ceiling type air conditioner, but in the drawings, the stand type indoor unit 21 is illustrated.

Meanwhile, the air conditioner 100 may further include at least one of a ventilation device, an air cleaning device, a humidifying device, and a heater, and may operate in conjunction with the operation of the indoor unit and the outdoor unit.

The outdoor unit 31 includes a compressor (not shown) that receives and compresses a refrigerant, an outdoor heat exchanger (not shown) that exchanges heat between the refrigerant and outdoor air, and an accumulator (not shown) that extracts gaseous refrigerant from the supplied refrigerant and supplies it to the compressor. Si) and a four-way valve (not shown) for selecting a flow path of the refrigerant according to the heating operation. In addition, a plurality of sensors, valves, oil collectors, and the like are further included, but a description of the configuration thereof will be omitted below.

The outdoor unit 31 operates an installed compressor and an outdoor heat exchanger to compress or heat exchange the refrigerant according to a setting to supply the refrigerant to the indoor unit 21. The outdoor unit 31 may be driven by a remote controller (not shown) or a demand of the indoor unit 21. In this case, as the cooling/heating capacity is varied in correspondence with the driven indoor unit, the number of operation of the outdoor unit and the number of operation of the compressor installed in the outdoor unit may be varied.

At this time, the outdoor unit 31 supplies the compressed refrigerant to the connected indoor unit 21.

The indoor unit 21 receives a refrigerant from the outdoor unit 31 and discharges cold and hot air into the room. The indoor unit 21 includes an indoor heat exchanger (not shown), an indoor unit fan (not shown), an expansion valve (not shown) through which the supplied refrigerant is expanded, and a plurality of sensors (not shown).

At this time, the outdoor unit 31 and the indoor unit 21 are connected by a communication line to transmit and receive data, and the outdoor unit and the indoor unit are connected by wire or wirelessly to a remote controller (not shown) and operate according to the control of a remote controller (not shown). can do.

A remote control (not shown) may be connected to the indoor unit 21, input a user's control command to the indoor unit, and receive and display status information of the indoor unit. In this case, the remote control may communicate by wire or wirelessly according to a connection type with the indoor unit.

2 is a schematic diagram of the outdoor unit and the indoor unit of FIG. 1.

Referring to FIG. 2, the air conditioner 100 is largely divided into an indoor unit 21 and an outdoor unit 31.

The outdoor unit 31 includes a compressor 102 that compresses a refrigerant, a compressor motor 102b that drives the compressor, an outdoor heat exchanger 104 that dissipates the compressed refrigerant, and an outdoor unit. An outdoor blower 105 comprising an outdoor fan 105a which is disposed on one side of the heat exchanger 104 to promote heat dissipation of the refrigerant and a motor 250 that rotates the outdoor fan 105a, and expansion to expand the condensed refrigerant A mechanism or expansion valve 106, a cooling/heating switching valve or four-way valve 110 that changes the flow path of the compressed refrigerant, and a refrigerant having a constant pressure are transferred to the compressor by temporarily storing the gasified refrigerant to remove moisture and foreign substances. It may include an accumulator 103 and the like to supply.

The indoor unit 21 includes an indoor heat exchanger 109 disposed indoors to perform a cooling/heating function, an indoor fan 109a disposed at one side of the indoor heat exchanger 109 to promote heat dissipation of refrigerant, and And an indoor blower 109 composed of an electric motor 109b that rotates the fan 109a.

At least one indoor heat exchanger 109 may be installed. At least one of an inverter compressor and a constant speed compressor may be used as the compressor 102.

In addition, the air conditioner 100 may be composed of a cooler that cools the room, or may be configured with a heat pump that cools or heats the room.

Meanwhile, the outdoor fan 105a in the outdoor unit 31 may be driven by an outdoor fan driving unit (not shown) that drives the motor 250.

Meanwhile, the compressor 102 in the outdoor unit 31 may be driven by a compressor motor driving unit (not shown) that drives the compressor motor 102b. The motor drive may also be referred to as a motor drive device or a compressor drive device.

Meanwhile, the indoor fan 109a in the indoor unit 21 may be driven by an indoor fan driving unit (not shown) that drives the indoor fan motor 109b.

The outdoor fan drive may also be referred to as an outdoor fan drive. In addition, the indoor fan driving unit may be referred to as an indoor fan driving device.

Hereinafter, an example of a driving unit will be described with reference to FIG. 3.

3 is a simplified internal block diagram of a compressor driving device provided in the air conditioner of FIG. 1.

Referring to FIG. 4, the compressor driving apparatus may include an input power supply unit 310, a power factor correction unit (PFC) 320, and an inverter 330.

Power is input to the input power unit 310. For example, AC power may be input to the input power unit 310. In addition, the input power unit 310 may further include a filter unit for removing noise from the input AC power.

The power factor corrector 320 may compensate for the power factor of the AC power. In addition, the power factor correcting unit 320 may convert the input AC power into DC power and simultaneously compensate a power factor for the supplied power.

In this case, the power factor compensation control may be performed by a control signal from the controller 350.

The power factor correction unit 320 may convert AC power into DC power and output the converted DC power.

To this end, the power factor correcting unit 320 may include a rectifier (not shown) and rectify the input AC power to output the rectified power. For example, the power factor correction unit 320 may include a bridge diode.

On the other hand, the internal configuration of the power factor correction unit 320 may apply any one of various known circuits.

For example, the power factor correction unit 320 may include a reactor (not shown) and an open capacitor (not shown) for improving the power factor from the input power, the reactor stores energy, and the capacitor continues charging and discharging. Thus, when there is a sudden change in the DC power, the reactor serves to supplement the current, thereby minimizing the influence of harmonic distortion.

In addition, the power factor correcting unit 320 may further include a switching element (not shown) that is operated by switching on or off by the control unit 350.

Alternatively, the power factor correction unit 320 may include a reactor to which rectified power is input, a reverse current prevention diode and a switching element connected to an output terminal of the reactor. When the switching element is turned off, the reverse current prevention diode conducts, a voltage obtained by subtracting the input voltage from the output voltage is applied to the reactor, and the reactor current linearly decreases. At this time, as power is supplied from the input terminal to the output terminal, the DC terminal capacitor is charged and energy is supplied to the compressor. When such an operation is repeated, the reactor current follows the phase of the input voltage, and the power factor can be improved.

The control unit 350 may control the switching element of the power factor correction unit 320 to turn on or off a power factor correction control function. In the present specification, when the power factor correction unit 320 is in an on state, the power factor correction control function is in an on state, and when the power factor correction unit 320 is in an off state, the power factor correction It may mean that the control function is turned off.

According to an embodiment, a rectifying unit for rectifying AC power may be separately provided outside the power factor correcting unit 320. In this case, the back-off correction unit 320 may be composed of elements that perform power factor correction.

Meanwhile, the compressor driving apparatus includes a dc terminal capacitor C for storing the DC power output from the power factor correction unit 320, and an inverter 330 for converting and outputting the DC power stored in the dc terminal capacitor C. Can include.

The dc terminal capacitor (C) smooths the input power and stores it. In the drawing, one device is illustrated as a dc-stage capacitor C, but a plurality of devices are provided to ensure device stability.

Meanwhile, since DC power is stored at both ends of the DC terminal capacitor C, it may be referred to as a dc terminal or a dc link terminal.

The DC power is converted to an AC voltage of a constant voltage or frequency through the inverter 330, and the converted power is supplied to the compressor motor 340.

The inverter 330 may drive the compressor motor 340 under control of the controller 350 to drive the compressor 102.

Meanwhile, in FIG. 3, an example in which one control unit 350 controls the power factor correction unit 320 and the inverter 330 is illustrated, but the present invention is not limited thereto.

For example, the air conditioner according to an embodiment of the present invention may include a PFC control unit that controls the power factor correction unit 320 and an inverter control unit that controls the inverter 330. Alternatively, the control unit 350 may include a PFC control unit and an inverter control unit. Here, the PFC controller may turn on/off the power factor compensation function, and the inverter controller may control the operation of the inverter 330.

The inverter 330 includes a plurality of inverter switching elements, converts DC power smoothed by an on/off operation of the switching element into three-phase AC power having a predetermined frequency, and outputs it to the compressor motor 340.

In the inverter 330, a pair of upper-arm switching elements and lower-arm switching elements connected in series with each other, respectively, and a total of three pairs of upper and lower arm switching elements are connected in parallel with each other. Diodes are connected in reverse parallel to each switching element.

The switching elements in the inverter 330 perform on/off operations of each switching element based on an inverter switching control signal from the inverter controller. Accordingly, three-phase AC power having a predetermined frequency is output to the compressor motor 340.

The inverter controller may output a pulse width modulation method (PWM) inverter switching control signal to the inverter to control the switching operation of the inverter.

The compressor motor 340 is at least one of a sensor motor and a sensorless motor, and the sensor motor and the sensorless motor may be separately driven at the same time.

In addition, the compressor motor 340 may operate by varying an operating frequency according to the control of the controller 350 according to the load capacity of the compressor 102.

The motor 340 includes a stator and a rotor, and AC power of each phase of a predetermined frequency is applied to a coil of the stator of each phase, so that the rotor rotates. As the type of the motor 230, various types, such as a brushless DC electric motor (BLDC) and a synchronous reluctance motor (synRM), are possible.

The control unit 350 outputs a switching control signal to the power factor correcting unit 320 in order to control the switching operation of the power factor correcting unit 320. The switching control signal may be generated based on the detected input current and the DC link end voltage and output to the power factor corrector 320.

In addition, the controller 350 outputs a switching control signal for an inverter to the inverter 330 in order to control the switching operation of the inverter 330. The switching control signal for the inverter is a switching control signal for PWM, which is generated based on the detected output current and output to the inverter 330.

3, the input current detection means 361 detects an input current from a commercial AC power source. The input current detection means 361 is located between the commercial AC power source and the power factor correction unit 320, but may be located between the commercial AC power source and the filter unit in some cases. As the input current detection means 361, a current sensor, a current trnasformer (CT), a shunt resistor, or the like may be used. The input current detection means 151 applies the detected input current to the control unit 350, and the detected input current is used for generation of a switching control signal and for protection operations such as overcurrent.

The dc link end voltage detection means 362 detects the voltage at the dc link end. As the dc link end voltage detection means 362, a resistance or the like may be used between both ends of the dc link end. The detected voltage of the dc link terminal is applied to the control unit 350 and is used for generation of a switching control signal and protection operation such as overvoltage.

The output current detection means 363 detects the output current of the output terminal of the inverter 330, that is, the current applied to the motor 340.

The output current detection means 363 may be located between the inverter 330 and the motor 340, and for current detection, a current sensor, a current trnasformer (CT), a shunt resistor, or the like may be used. In addition, the output current detection means 363 may be a shunt resistor having one end connected to the three lower arm switching elements in the inverter 330, respectively. The detected output current is applied to the control unit 350 and is used for generation of an inverter switching control signal and protection operation such as overcurrent.

Meanwhile, the controller 350 may estimate a voltage according to a sensorless algorithm, and calculate an operating frequency and power consumption of the compressor.

Alternatively, in the case of an embodiment including a sensor, data measured by the sensor is transmitted to the controller 350, and the controller 350 may calculate the operating frequency and power consumption of the compressor based on the data received from the sensor.

When generating a switching control signal for controlling the power factor correction unit 320, the control unit 350 may control the power factor correction control of the power factor correction unit 320 to be performed in consideration of the operating frequency and power consumption of the compressor. .

Meanwhile, a hysteresis zone for controlling power factor compensation hysteresis may be set.

The controller 350 may determine the power factor correction unit 320 on/off by determining the power consumption in the operating state in the hysteresis zone.

4 and 5 are diagrams referred to for explanation of hysteresis control of a power factor correction unit.

FIG. 4 shows an example of setting hysteresis for 3kW PFC driving, and FIG. 5 shows drive efficiency according to PFC on/off of the power factor corrector 320 in the setting of FIG. 4.

Referring to FIGS. 4 and 5, a first reference value of a hysteresis zone may be set to 1000W, and a second reference value of 1200W may be set.

In this case, the control unit 350 may control the power factor correction unit 320 so that the PFC is turned on when the determined power consumption is greater than 1200W. That is, when the power consumption is greater than 1200W, the PFC control can be entered.

In addition, when the determined power consumption is less than 1000W, the control unit 350 may control the power factor correction unit 320 to turn off the PFC. That is, if the power consumption is less than 1000W, it is possible to escape from the PFC control.

In terms of the efficiency of the outdoor unit, the determination of the PFC entry point has an important meaning. At this time, the hysteresis zone is set to prevent frequent entry and exit of the drive from the PFC, thereby improving stability.

However, as the hysteresis zone rises and falls reference values are set, there is a certain band for entering/exiting the PFC, and the maximum efficiency is achieved due to the band depending on the direction of load rise or fall during actual operation. There was a problem that you couldn't drive.

As shown in FIG. 5, an efficiency loss area section that loses efficiency occurs according to a hysteresis zone setting and a load direction.

However, according to the present invention, when several conditions are satisfied in a hysteresis zone, the outdoor unit can always be operated at the highest efficiency condition while the air conditioner is operating by entering/exiting the PFC.

Accordingly, it is possible to improve power consumption that is wasted due to a decrease in driving efficiency in the hysteresis zone.

When the value of the power consumption calculated by voltage/current sensing in the compressor driving unit is within the hysteresis zone, the control unit 350 may control the PFC control on/off of the power factor correction unit 320 in consideration of an additional condition. have. Here, the compressor driving unit may be the compressor driving apparatus described with reference to FIG. 3.

Referring to an example in which the first reference value of the hysteresis zone is set to 1000W and the second reference value is 1200W, as shown in FIGS. 4 and 5, if the current load is within the hysteresis zone as follows, the controller 450 Confirms that the current load is not changing.

Condition 1: 1000W <operating load ≤ 1200W

The controller 350 may determine that the compressor operation is stabilized when there is no fluctuation in the compressor operation frequency for a predetermined time. For example, when there is no change in the operating frequency of the compressor during two cycles of the compressor control period (30s * 2), the control unit 350 may enter the process of calculating/comparison of an average power consumption value.

In reality, the measured or calculated operating frequency is likely to have a predetermined fluctuation width, and therefore, the controller 350 may enter the average power consumption calculation/comparison process when the fluctuation of the compressor operating frequency for a predetermined time is within a predetermined range.

In the process of calculating/comparing the average power consumption value, the control unit 350 may invert the state of the power factor corrector 350 to calculate and compare the average power consumption value in the two states.

For example, in the case of the current PFC On (Off), the average value of the power consumption for one minute is calculated, and the power consumption for one minute can be calculated and compared by turning the PFC Off (On).

At this time, the control unit 350 may operate on (Off) when the power consumption of the PFC On (Off) is low. That is, the driving state of the power factor correcting unit 350 may be determined in the direction of the lower power consumption among the two states. Accordingly, it is possible to improve power consumption that is wasted due to a decrease in driving efficiency in the hysteresis zone.

6 is a flowchart of a control method of an air conditioner according to an embodiment of the present invention.

Referring to FIG. 6, first, when the operation of the compressor is started according to a predetermined operation mode (S610), the controller 350 may determine the power consumption of the compressor (S620).

Meanwhile, the power consumption of the compressor may be calculated based on voltage and current values measured by a driving unit of the compressor. Here, the compressor driving unit may be the compressor driving apparatus described with reference to FIG. 3.

The controller 350 may estimate a voltage according to a sensorless algorithm, and may calculate an operating frequency and power consumption of the compressor.

Alternatively, in the case of an embodiment including a sensor, data measured by the sensor is transmitted to the controller 350, and the controller 350 may calculate the operating frequency and power consumption of the compressor based on the data received from the sensor.

If the determined power consumption is greater than the first reference value and less than the second reference value (S630), the controller 350 may determine whether the fluctuation of the operating frequency of the compressor during the first period is within a reference range (S640).

That is, if the current load is within the hysteresis zone set as the first reference value and the second reference value as in the above-described first condition (S630), the control unit 450 changes the operating frequency of the compressor during the first period under the second condition. It is determined whether it is within this reference range, and it is confirmed that the current load is not changing (S640).

If the fluctuation of the operating frequency of the compressor during the first period is within the reference range (S640), the control unit 350 may calculate a first average power consumption value (A), which is an average value of power consumption during the second period. (S650).

Thereafter, the control unit 350 inverts the state of the power factor correction unit 320 from the first state to the second state (S660), and the second power consumption is an average value of the power consumption during the second period in the second state. The average value B may be calculated (S670).

Here, when the first state is on, the second state may be off, and when the first state is off, the second state may be on. That is, the control unit 350 may calculate an average value of power consumption in the on/off state while reversing the state of the power factor correcting unit 320.

When the first average power consumption value A is not greater than the second average power consumption value B (S680), the control unit 350 determines the state of the power factor correcting unit 320 in the second state. It can be reversed to the state (S690).

If the first average power consumption value A is greater than the second average power consumption value B, the control unit 350 may maintain the state of the power factor correcting unit 320 in the second state.

That is, the control unit 350 may determine the operating state of the power factor correction unit 350 in the direction in which the power consumption is lower among the two states. Accordingly, it is possible to improve power consumption that is wasted due to a decrease in driving efficiency in the hysteresis zone.

Meanwhile, when the power consumption during the first period is less than or equal to the first reference value, the control unit 350 may control the state of the power factor correction unit 320 to an off state, and during the first period When the power consumption of is greater than the second reference value, the state of the power factor correcting unit 320 may be controlled to be an on state.

That is, the control unit 350 may prevent excessively frequent switching by performing the conventional hysteresis control in the same manner in a section other than the range between the first reference value and the second reference value, thereby maintaining high safety.

According to an embodiment, the first period and the second period may be set to be the same. For example, the first period, which is the load variation determination period of the compressor, and the second period, which is the average power consumption value calculation period, may be set equal to 1 minute. Accordingly, the timer and control can be performed more simply.

According to at least one of the embodiments of the present invention, power factor compensation can be efficiently performed.

Further, according to at least one of the embodiments of the present invention, the outdoor unit can always be operated under the highest efficiency condition.

The air conditioner and the control method thereof according to the present invention are not limited to the configuration and method of the embodiments described as described above, but the embodiments are all or part of each embodiment so that various modifications can be made. May be configured by selectively combining.

Meanwhile, the control method of a home air conditioner according to an embodiment of the present invention can be implemented as a code that can be read by a processor on a recording medium that can be read by a processor. The processor-readable recording medium includes all types of recording devices that store data that can be read by the processor. Examples of recording media that can be read by the processor include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage, etc., and also include those implemented in the form of carrier waves such as transmission through the Internet. . Further, the processor-readable recording medium is distributed over a computer system connected through a network, so that the processor-readable code can be stored and executed in a distributed manner.

In addition, although the preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above, and the technical field to which the present invention belongs without departing from the gist of the present invention claimed in the claims. In addition, various modifications are possible by those of ordinary skill in the art, and these modifications should not be individually understood from the technical spirit or prospect of the present invention.

Power: 310
Power factor correction unit: 320
Inverter: 330
Control: 350

Claims (7)

Starting operation of the compressor according to a predetermined operation mode;
Determining power consumption of the compressor;
Determining whether the power consumption is greater than a first reference value and less than a second reference value, and whether a fluctuation of the operating frequency of the compressor during a first period is within a reference range;
Calculating a first power consumption average value, which is an average power consumption value during a second period, when the fluctuation of the operating frequency of the compressor during the first period is within the reference range;
Inverting the state of the power factor correction unit from the first state to the second state;
Calculating a second average power consumption value that is an average value of power consumption during the second period in the second state; And,
If the average value of the first power consumption is not greater than the average value of the second power consumption, inverting a state of the power factor correcting unit from the second state to the first state,
The first period, which is a load variation determination period of the compressor, is set equal to two periods of the compressor control period, and
The second period, which is the average power consumption value calculation period, is set equal to the first period. The method of claim 1,
When the first average power consumption value is greater than the second average power consumption value, the power factor correcting unit maintains the second state. The method of claim 1,
An air conditioner, characterized in that when the first state is on, the second state is off, and when the first state is off, the second state is on. Control method. The method of claim 1,
When the power consumption during the first period is less than or equal to the first reference value, controlling a state of the power factor correction unit to an off state. The method of claim 1,
When the power consumption during the first period is greater than the second reference value, controlling a state of the power factor correction unit to an on state. delete The method of claim 1,
The power consumption of the compressor is calculated based on voltage and current values measured by a driving unit of the compressor.

Images