KR100187219B1 - Defrost device and its control method of airconditioner - Google Patents

Abstract

The present invention relates to a defrosting apparatus of an air conditioner for performing a defrosting operation in accordance with an input power supply voltage changing during a defrosting operation of an air conditioner, and a control method thereof. Indoor piping temperature sensing means for sensing the pipe temperature of the air, Outdoor temperature sensing means for sensing the outdoor temperature changing during the heating operation of the air conditioner, and the appearance of the heat exchanger according to the indoor piping temperature and outdoor temperature Control means for controlling the defrosting operation by determining whether or not. Four-way valve driving means for controlling the four-way valve to change the flow path through which the refrigerant is circulated according to the control of the control means, Compressor manual means for driving control of the compressor to perform defrosting operation under the control of the control means; Current sensing means for detecting a varying consumption current of the compressor to determine whether frost formed on the outdoor heat exchanger has been removed during defrosting operation by control of a control means, and change during defrosting operation by control of the control means Characterized in that the input voltage detection means for detecting the input power supply voltage.

Description

Defroster of air conditioner and control method

1 is a cooling / heating cycle diagram of a general air conditioner.

2 is a control block diagram of a defrosting apparatus of an air conditioner according to an embodiment of the present invention.

3A to 3C are flowcharts showing the defrost control operation procedure of the air conditioner according to the present invention.

* Explanation of symbols for main parts of the drawings

10: DC power supply means 15: operation operation means

20: control means 25: input voltage detection means

30: indoor temperature sensing means 35: indoor piping temperature sensing means

40: outdoor temperature sensing means 50: four-way valve driving means

51: four-way valve 60: compressor driving means

61 compressor 65 current sensing means

70: outdoor fan motor driving means 71: outdoor fan

80: indoor fan motor driving means 81: indoor fan

90: display means

The present invention relates to a defrosting apparatus of an air conditioner and a control method thereof, which perform defrosting operation by accurately determining a freezing state of an outdoor heat exchanger according to an input power supply voltage changing during a defrosting operation of an air conditioner.

In general, in the case of heating in an inverter air conditioner (hereinafter referred to as an air conditioner) that also serves as heating and cooling, as shown by a dotted line (-) in FIG. The refrigerant is controlled by the compressor (61) → four-way valve (51) → indoor heat exchanger (52) → expansion valve (53) → heating expansion valve (54) → outdoor heat exchanger (55) → four-way valve (51) → compressor ( 61) to be circulated in order.

On the other hand, in the case of cooling, as shown by the solid line (→) in FIG. 1, the four-way valve 51 is controlled by the control means so that the refrigerant is compressed from the compressor 61 to the four-way valve 51 to the outdoor heat exchanger 55. ) One-way valve (56) → expansion valve (53) → indoor heat exchanger (52) → four-way valve (51) → compressor (61).

When the heating operation is performed for a predetermined time in the air conditioner for both heating and cooling as described above, when the air blown by the outdoor fan 71 is cooled by heat exchange in the outdoor heat exchanger 55 by the latent heat of evaporation of the refrigerant, The frost is implanted in the outdoor heat exchanger 55 by the discharged cold air, and the frost formed in the outdoor heat exchanger 55 becomes thicker as time passes, thereby lowering the heat exchange capacity of the outdoor heat exchanger 55, and thus heating. There has been a problem that power consumption increases due to a decrease in efficiency.

In addition, the freezing phenomenon of the outdoor heat exchanger 55 due to frost formed on the outdoor heat exchanger 55 may cause damage to the device.

Accordingly, in the conventional air conditioner, to solve this problem, the continuous operation time of the compressor 61 is countered while sensing the pipe temperature and the outdoor temperature of the indoor heat exchanger 52 which change during the heating operation of the air conditioner. If the defrosting operation condition set in advance in the control means is met, it is determined that frost is implanted in the outdoor heat exchanger 55.

When it is determined that frost has landed on the outdoor heat exchanger 55, the heating operation is stopped and the four-way valve 51 is controlled under the control of the control means to switch the air conditioner to cooling operation.

Accordingly, the refrigerant is compressed by the compressor 61 → four-way valve 51 → outdoor heat exchanger 55 → one-way valve 56 → expansion valve 53 → indoor heat exchanger 52 → four-way valve 51 → compressor ( By forming a refrigeration cycle circulating in the order of 61), a defrosting operation for removing frost formed on the outdoor heat exchanger 55 is started.

At this time, if the current consumption sensor changes the current consumption of the compressor 61 and the detected current consumption is more than a predetermined predetermined current, the control means that the frost formed on the outdoor heat exchanger 55 is completely removed. By judging and releasing (stopping) the defrosting operation (cooling operation), the four-way valve 51 is controlled to switch the air conditioner back to the heating operation.

However, in such a defrosting operation method, since the defrosting operation release condition is based only on the current consumption of the compressor, it is not possible to accurately detect the frost state of the outdoor heat exchanger when the input power voltage of the AC power input stage changes. .

That is, when the input power voltage of the AC power input terminal increases, the current consumption flowing in the compressor decreases. When the input power voltage of the AC power input terminal decreases, the current consumption flowing in the compressor increases. Since the frost state of the heat exchanger cannot be detected accurately, the frost formed on the outdoor heat exchanger cannot be completely removed even when the defrosting operation is released, and the heat exchange capacity of the outdoor heat exchanger is not reduced, and thus the power consumption is reduced due to the decrease in the heating efficiency. There was a problem that this rises.

In addition, when the input power supply voltage is an abnormal voltage (less than 187V or more than 254V), there is a problem that the compressor is damaged and the device is damaged.

Therefore, the present invention has been made to solve the above problems, an object of the present invention is to accurately determine the freezing state of the outdoor heat exchanger according to the changing input power voltage of the AC power input stage to be implanted in the outdoor heat exchanger during heating operation. The present invention provides a defrosting device for an air conditioner and a method of controlling the same, which can completely remove frost and improve heating efficiency.

Another object of the present invention is to provide a defrosting apparatus of an air conditioner and a control method thereof, which can prevent an excessive operation of the compressor by stopping the compressor when the input power supply voltage is an abnormal voltage.

In order to achieve the above object, a defrosting apparatus of an air conditioner according to the present invention includes an indoor piping temperature sensing means for sensing a pipe temperature of an indoor heat exchanger which changes during a heating operation of the air conditioner; Outdoor heat exchange according to the outdoor temperature sensing means for sensing the outdoor temperature changing during the heating operation of the air conditioner, the indoor piping temperature sensed by the indoor pipe temperature sensing means and the outdoor temperature sensed by the outdoor temperature sensing means. A control means for controlling defrosting operation by determining whether or not there is a problem with the formation of the machine, a four-way valve driving means for controlling the four-way valve so as to change a flow path through which the refrigerant circulates according to the control of the control means, and the control of the control means. Compressor drive means for driving control of the compressor to perform defrosting operation according to the present invention, and the outdoor unit during defrosting operation by control of the control means. Current sensing means for detecting a change in the current consumption of the compressor to determine whether the frost formed on the heat exchanger has been removed, and input voltage sensing means for detecting the input power voltage changes during the defrost operation by the control of the control means Characterized in that made.

In addition, the defrosting control method of the air conditioner according to the present invention is a defrosting discrimination step of determining the defrost condition of the outdoor heat exchanger according to the indoor piping temperature, the outdoor temperature and the operating time of the compressor changes during the heating operation of the air conditioner And a defrosting operation for changing the flow path in which the refrigerant circulates during the defrosting step in the defrosting determining step to a cooling operation, and to remove frost formed on the outdoor heat exchanger according to the refrigerant flow path changed in the flow path changing step. Detects a defrosting operation step for performing a step, a current sensing step for detecting a current consumption of the compressor that is changed during the defrosting operation in the defrosting operation step, and an input power supply voltage that is changed during the defrosting operation in the defrosting operation step The frost formed on the outdoor heat exchanger according to the voltage sensing step and the input power supply voltage sensed by the voltage sensing step are removed. And a defrosting determination step of determining a defrosting release condition by comparing the current adjustment step of adjusting the reference current to determine a reference current, and the reference current adjusted in the current adjustment step with the consumption current sensed in the current sensing step. do.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, in the heating of the air conditioner, the refrigerant compressed by the compressor 61 to the gas state at high temperature and high pressure is controlled by the compressor 61 by controlling the four-way valve 51 under the control of the control means described later. When introduced into the indoor heat exchanger 52 through the 51, the indoor heat exchanger 52 cools the air blown by the indoor fan 81 with a coolant or air at room temperature to cool it with a high temperature refrigerant. In accordance with the warm air (hot air) is discharged to the room to perform the heating.

The refrigerant liquefied in the indoor heat exchanger (52) is decompressed to the low temperature and low pressure refrigerant through the expansion valve (53) and the heating expansion valve (54) and flows into the outdoor heat exchanger (55).

Therefore, in the outdoor heat exchanger 55, the refrigerant depressurized by the expansion valve 53 and the heating expansion valve 54 is cooled by heat exchange with air blown by the outdoor fan 71, and the outdoor heat exchanger 55 is cooled. The low-temperature low-temperature gas refrigerant is sucked back into the compressor 61 through the four-way valve 51 to form a refrigeration cycle that is repeatedly circulated as shown by the dotted line (---) of FIG. Do this.

On the other hand, when the air conditioner is cooled, when the refrigerant compressed by the compressor 61 to the gas of high temperature and high pressure flows into the outdoor heat exchanger 55 by controlling the four-way valve 51 under the control of the control means. In the outdoor heat exchanger (55), the gas refrigerant compressed at high temperature and high pressure is liquefied by forcibly cooling with air blown by the outdoor fan (71).

The low temperature and high pressure liquid refrigerant liquefied in the outdoor heat exchanger (55) passes through an expansion valve (53) which expands to the evaporation pressure through the one-way valve (56) and is decompressed to a low-temperature, low-pressure free refrigerant to obtain an indoor heat exchanger (52). Flows into. Therefore, in the indoor heat exchanger (52), when the low-temperature low-pressure free refrigerant reduced in the expansion valve (53) evaporates and vaporizes through a plurality of pipes, it takes away heat from the air blown by the indoor fan (81). After cooling the air, the cooled air (cold air) is discharged to the room for cooling, and the low-temperature low-pressure gas refrigerant cooled by the indoor heat exchanger 52 is again sucked into the compressor 61 and the solid line of FIG. As shown by (→), room cooling is performed while forming a recirculating refrigeration cycle.

A block diagram of an apparatus for controlling the heating and cooling by the refrigeration cycle as described above will be described with reference to FIG.

As shown in FIG. 2, the DC power supply unit 10 receives a power supply voltage of a commercial AC power supplied from an AC power input terminal (not shown) and converts it into a predetermined DC voltage required for the operation of the air conditioner. In addition, the operation operation means 15 is a plurality of function keys to input the operating conditions (cooling, heating, dehumidification, cleaning and blowing operation, etc.), the set temperature (Ts), the air volume and the wind direction of the air conditioner desired by the user. It is provided on the control panel and remote control of the air conditioner.

In addition, the control unit 20 receives the DC voltage output from the DC power supply unit 10 to initialize the air conditioner, as well as the air conditioner according to the operation condition input by the operation operation unit 15. A microcomputer that controls the overall air conditioning operation of the air conditioner, the control means 20 is a frost formed on the outdoor heat exchanger 55 according to the input power supply voltage of the AC power input terminal sensed by the voltage sensing means described later. By varying the reference current data of the compressor 61 to determine whether it has been removed, it is accurately determined whether the outdoor heat exchanger 55 is implanted regardless of the change in the input power voltage.

In addition, the input voltage detection means 25 detects the input power voltage of the commercial AC power supplied from the AC power input terminal and outputs it to the control means 20, the indoor temperature detection means 30 is the operation operation By controlling the temperature (Ts) set by the user by the means 15 to detect the temperature (Tr) of the indoor air sucked through the inlet (not shown) of the air conditioner to perform the air conditioning operation Output to the means 20.

In addition, the indoor pipe temperature detecting means 35 detects the pipe temperature Tp of the indoor heat exchanger 52 that is changed during the heating operation of the air conditioner, that is, the refrigerant temperature passing through the indoor heat exchanger 52. It outputs to the control means 20, the outdoor temperature detecting means 40 detects the outdoor temperature (To) changes during the heating operation of the air conditioner and outputs to the control means (20).

The four-way valve driving means 50 receives the control signal output from the control means 20 so as to change the flow path through which the refrigerant circulates according to the operating conditions (cooling or heating) input by the driving operation means 15. Drive control of the valve (51).

In addition, in the drawing, the compressor driving means 60 is a control signal output from the control means 20 in accordance with the difference between the temperature Ts set by the user by the driving operation means 15 and the room temperature Tr. Drive control of the compressor (61), and the current sensing means (65) determines whether the frost formed on the outdoor heat exchanger (55) is completely removed when the compressor (61) is driven by the compressor driving means (60). In order to determine the current consumption of the compressor 61 is detected and output to the control means (20).

In addition, the outdoor fan motor driving means 70 receives the control signal output from the control means 20 and controls the rotation speed of the outdoor fan motor to blow the air heat-exchanged by the outdoor heat exchanger 55 to the outdoor The fan 71 is driven and controlled, and the indoor fan motor driving means 80 receives the control signal output from the control means 20 according to the air volume set by the user by the driving operation means 15 to exchange the indoor heat. The indoor fan 81 is controlled to drive by controlling the rotation speed of the indoor fan motor to blow the air (cold or warm air) heat-exchanged in the machine 52 to the room.

In addition, the display means 90 displays the operation conditions set by the user by the operation operation means 15 under the control of the control means 20, as well as display the operation state of the air conditioner.

Hereinafter, the effect of the defrosting device of the air conditioner and the control method configured as described above will be described.

3A to 3A are flowcharts showing the defrost control operation procedure of the air conditioner according to the present invention. 3A to 3A, S denotes a step.

First, when power is applied to the air conditioner, the DC power supply unit 10 receives commercial AC power from an AC power input terminal (not shown) and converts the AC power into a predetermined DC voltage required for driving the air conditioner. Output to the control means 20.

Therefore, in step S1, the DC voltage output from the DC power supply means 10 is inputted from the control means 20, and the air conditioner is initialized. In step S2, operation conditions of the air conditioner desired by the user (cooling, heating, Dehumidification, cleanness, etc.), the set temperature (Ts) and the indoor discharge air volume are inputted by the operation operation means 15, and then the operation / stop button is pressed.

Subsequently, in step S3, the control means 20 determines whether the driving condition input by the driving operation means 15 is 'heating operation', and if it is not 'heating operation' (No), the step S2. The operation of step S2 and below is repeated while the air conditioner is kept in operation standby state.

As a result of the discrimination in step S3, when the operation condition input by the operation operation means 15 is 'heating operation' (Yes), it is supplied to the current air conditioner before the heating operation of the air conditioner is performed. Since it is necessary to check whether the input power voltage is a normal voltage or an abnormal voltage, in step S4, the input voltage detecting means 25 detects the input power voltage of the commercial AC power supplied from the AC power input terminal and detects the control means ( 20).

Accordingly, in step S5, the control means 20 determines whether the input power supply voltage sensed by the input voltage sensing means 25 is an abnormal voltage (less than 180V, 260V or more), and is not an abnormal voltage (NO day). The four-way valve 51 to control the four-way valve 51 in order to perform the heating operation of the air conditioner, the control means 20 controls the four-way valve 51 in step S6. 50).

Accordingly, in the four-way valve driving means 50, the refrigerant is driven by the four-way valve 51 under the control of the control means 20, so that the refrigerant is compressed from the compressor 61 to the four-way valve 51 to the indoor heat exchanger 52 to the expansion valve. (53) → heating expansion valve (54) → outdoor heat exchanger (55) → four-way valve (51) → compressor (61).

At this time, in step S7 the control means 20 outputs a control signal for driving the indoor fan 81 to the indoor fan motor driving means (80).

Therefore, the indoor fan motor driving means 80 receives the control signal output from the control means 20 according to the set air volume input by the driving operation means 15 to control the rotation speed of the indoor fan motor to indoor The fan 81 is driven.

When the indoor fan 81 is driven, indoor air starts to be sucked into the air conditioner through an entrance (not shown). In step S8, the indoor temperature sensing means (Tr) of indoor air sucked through the entrance is detected. Detected by the 30 and output to the control means (20).

Subsequently, in step S9, it is determined whether the room temperature Tr sensed by the room temperature sensing means 30 is smaller than the set temperature Ts input by the driving operation means 15, and the room temperature Tr. Is not smaller than the set temperature Ts (NO), the air conditioner does not need to be heated, and the process returns to step S8 to repeat the operation below step S8 while continuously detecting the room temperature Tr. .

As a result of the discrimination in step S9, when the room temperature Tr is smaller than the set temperature Ts (YES), the room must be heated. In step S10, the predetermined time after driving the indoor fan 81 in step S7. (Delay time for protecting the compressor; about 3 minutes) is determined. If the predetermined time has not elapsed (NO), the process returns to step S7 and the indoor fan ( 81) Drive only.

As a result of the discrimination in step S10, when a predetermined time has elapsed (YES), even when the compressor 61 is driven due to a constant current consumption, there is no problem in the compressor 61, so the control means 20 in step S11. Determines the operating frequency of the compressor 61 according to the difference between the room temperature Tr and the set temperature Ts, and outputs a control signal for driving the compressor 61 to the compressor driving means 60.

Therefore, the compressor driving means 60 drives the compressor 61 according to the operating frequency determined by the control means 20.

When the compressor 61 is driven, the refrigerant compressed by the compressor 61 into gas of high temperature and high pressure is introduced into the indoor heat exchanger 52 through the four-way valve 51, and the indoor heat exchanger ( In 52), the air blown by the indoor fan 81 is heated by cooling water or air at room temperature to cool it with a refrigerant of room temperature and high pressure, thereby discharging warmed air (hot air) to the room to perform heating.

The refrigerant liquefied in the indoor heat exchanger (52) is decompressed to the low temperature and low pressure refrigerant through the expansion valve (53) and the heating expansion valve (54) and flows into the outdoor heat exchanger (55).

Therefore, in the outdoor heat exchanger 55, the refrigerant depressurized by the expansion valve 53 and the heating expansion valve 54 is cooled by heat exchange with air blown by the outdoor fan 71, and the outdoor heat exchanger 55 is cooled. The low-temperature low-temperature gas refrigerant is sucked back into the compressor 61 through the four-way valve 51 to form a refrigeration cycle that is repeatedly circulated as shown by the dotted line (---) of FIG. Do this.

When the heating operation is performed as described above, the outdoor air is discharged to the outside when the air blown by the outdoor fan 71 is cooled by heat exchange by the latent heat of evaporation of the refrigerant in the outdoor heat exchanger 55. The frost is implanted on the surface of the heat exchanger 55, and the frost formed as the ice becomes thicker as time passes, causing freezing of the outdoor unit.

Accordingly, in order to prevent freezing of the outdoor unit, in step S13, the control means 20 changes the indoor piping temperature Tp, the outdoor temperature To, and the compressor 61, which are changed during the heating operation of the air conditioner. The defrosting condition according to the operation time Tt is determined.

That is, in the control means 20, the pipe temperature Tp of the indoor heat exchanger 52 sensed by the indoor pipe temperature sensing means 35 is frosted on the outdoor heat exchanger at a predetermined temperature (Tps: heating operation). Pipe temperature at which freezing occurs) or less, and the outdoor temperature (To) detected by the outdoor temperature sensing means 40 is a minimum temperature at which the frost formed on the outdoor heat exchanger can be naturally removed. Temperature, about 0 [deg.] C. or less, the operating time Tt of the compressor 61 is a predetermined time Tts (minimum operating time of the compressor that can cause frost to form on the outdoor heat exchanger during heating operation of the air conditioner). 20 minutes), frost is formed on the outdoor heat exchanger 55 and a freezing phenomenon occurs, that is, it is determined that it is a defrost condition.

As a result of the determination in step S13, if it is not the defrosting condition (NO), the operation of step S13 or less is repeatedly performed while continuing heating operation, and if it is the defrosting condition (YES), the outdoor heat exchanger In step S14, the control means 20 controls the four-way valve 51 to perform defrosting operation of the air conditioner while the control means 20 determines that the frost has been frozen on the 55. The control signal is output to the four-way valve driving means 50.

Accordingly, in the four-way valve driving means 50, the four-way valve 51 is driven under the control of the control means 20, so that the refrigerant flows from the compressor 61 to the four-way valve 51 to the outdoor heat exchanger 55 in step S15. → one-way valve (56) → expansion valve (53) → indoor heat exchanger (52) → four-way valve (51) → compressor (61) to form a refrigeration cycle circulating in the frost formed on the outdoor heat exchanger (55). Start to perform defrosting operation to remove.

At this time, in step S16, the current consumption means I of the compressor 61 that changes during the defrosting operation of the air conditioner is held by the current sensing means 65 and output to the control means 20. In step S17, the air In the defrosting operation of the conditioner, the input power voltage V of the commercial AC power supplied from the AC power input terminal is sensed by the input voltage detecting means 25 and output to the control means 20.

Accordingly, in step S18, the control means 20 determines whether the input power supply voltage V sensed by the input voltage detection means 25 is A, that is, 180V or more and less than 190V, thereby determining the input power supply voltage (V). If () is not A (NO), the flow advances to step S19 to determine whether the input power supply voltage V sensed by the input voltage detecting means 25 is B, that is, 190V or more and less than 200V.

As a result of the discrimination in step S19, when the input power supply voltage V is not B (NO), the flow advances to step S20 to determine whether the input power supply voltage V is C, that is, 200V or more and less than 210V. If the input power supply voltage V is not C (NO), the flow advances to step S21 to determine whether the input power supply voltage V is D, that is, 210V or more and less than 220V.

As a result of the discrimination in step S21, if the input power supply voltage V is not D (NO), the flow advances to step S22 to determine whether the input power supply voltage V is E, that is, 220V or more and less than 230V, If the input power supply voltage V is not E (NO), the flow advances to step S23 to determine whether the input power supply voltage V is F, that is, 230V or more and less than 240V.

As a result of the discrimination in step S23, when the input power supply voltage V is not F (NO), the flow advances to step S24 to determine whether the input power supply voltage V is G, that is, 240V or more and less than 250V. If the input power supply voltage V is not G (NO), the flow advances to step S25 to determine whether the input power supply voltage V is H, that is, 250V or more and less than 260V.

As a result of the discrimination in step S25, when the input power supply voltage V is H (YES), the flow advances to step S26, whereby the control means 20 of the compressor 61 sensed by the current sensing means 65. It is discriminated whether or not the current consumption I is equal to or greater than the preset reference current data (Ih: current consumption of the compressor determined to completely remove frost formed on the outdoor heat exchanger when the input power supply voltage is 250V or more and less than 260V).

As a result of the discrimination in step S26, when the current consumption I of the compressor 61 is not equal to or greater than the reference current data Ih (NO), frost formed on the outdoor heat exchanger 55 is not completely removed. It judges that it is a state, and returns to the said step S15, repeating operation of step S15 or less, continuing defrosting operation.

On the other hand, when the discrimination result in step S26 is that the current 61 of the compressor 61 is equal to or greater than the reference current data Ih (YES), the frost formed on the outdoor heat exchanger 55 is completely removed. In step S27, the control means 20 outputs a control signal for controlling the four-way valve 51 to the four-way valve driving means 50.

Therefore, in the four-way valve driving means 50, the four-way valve 51 is driven under the control of the control means 20, and in step S28, as shown by the dotted line (---) in FIG. 61) → four-way valve (51) → indoor heat exchanger (52) → expansion valve (53) → heating expansion valve (54) → outdoor heat exchanger (55) → four-way valve (51) → compressor (61) A refrigeration cycle is formed to complete the indoor heating operation and terminate the operation.

On the other hand, when the determination result in the step S18, if the input power supply voltage (V) is A (YES), the flow advances to step S30, the control means 20 is a compressor 61 sensed by the current sensing means (65). Discriminate whether or not the current consumption (I) of is greater than the preset reference current data (la: the current consumption of the compressor that is determined to have completely removed the frost formed on the outdoor heat exchanger when the input power supply voltage is more than 180V and less than 190V). .

As a result of the discrimination in step S30, when the current consumption I of the compressor 61 is not greater than or equal to the reference current data la (NO), frost formed on the outdoor heat exchanger 55 is not completely removed. If it is determined that the state is returned to step S15, the operation of step S15 or less is repeated, and if the current consumption I of the compressor 61 is greater than or equal to the reference current data la (YES), the outdoor heat exchanger 55 It is determined that the frost conceived in step 1) is completely removed, and the flow proceeds to step S27 to repeat the operation of step S27 and below.

In addition, when the determination result in step S19 indicates that the input power supply voltage V is B (YES), the controller 20 proceeds to step S31 and the control means 20 detects the compressor 61 by the current sensing means 65. Discriminate whether the current consumption (I) of the power supply is greater than the preset reference current data (Ib: current consumption of the compressor that is determined to have completely removed frost formed on the outdoor heat exchanger when the input power supply voltage is more than 190V and less than 200V). .

As a result of the determination in step S31, when the current consumption I of the compressor 61 is not equal to or greater than the reference current data Ib (NO), it is determined that frost formed on the outdoor heat exchanger is not completely removed. After returning to step S15, the operation of step S15 or less is repeated, and if the current consumption I of the compressor 61 is greater than or equal to the reference current data Ib (YES), frost formed on the outdoor heat exchanger is completely removed. In step S27, the operation after step S27 is repeated.

As a result of the discrimination in step S20, when the input power supply voltage V is C (YES), the flow advances to step S32, whereby the control means 20 detects the compressor 61 by the current sensing means 65. Discriminate whether the current consumption (I) of the power supply is equal to or greater than the preset reference current data (Ic: the current consumption of the compressor determined to be completely removed from the frost formed on the outdoor heat exchanger when the input power supply voltage is 200V or more and less than 210V). .

As a result of the determination in step S32, when the consumption current I of the compressor 61 is not equal to or greater than the reference current data Ic (NO), frost formed on the outdoor heat exchanger 55 is not completely removed. If it is determined that the state is returned to step S15, the operation of step S15 or less is repeated, and when the current consumption I of the compressor 61 is equal to or greater than the reference current data Ic (YES), the outdoor heat exchanger 55 In step S27, it is determined that the frost conceived in step 2) has been completely removed, and the operation of step S27 and below is repeated.

As a result of the discrimination in step S21, when the input power supply voltage V is D (YES), the flow advances to step S33, whereby the control means 20 detects the compressor 61 by the current sensing means 65. Discriminate whether the current consumption (I) of the is greater than the preset reference current data (Id: current consumption of the compressor that is determined to have completely removed frost formed on the outdoor heat exchanger when the input power supply voltage is 210V or more and 220V or less).

As a result of the discrimination in step S33, when the current consumption I of the compressor 61 is not greater than or equal to the reference current data Id (NO), frost formed on the outdoor heat exchanger 55 is not completely removed. If it is determined that the state is returned to step S15, the operation of step S15 or less is repeated, and if the current consumption I of the compressor 61 is equal to or greater than the reference current data Id (YES), the outdoor heat exchanger 55 In step S27, it is determined that the frost conceived in step 2) has been completely removed, and the operation of step S27 and below is repeated.

On the other hand, when the determination result in the step S22, if the input power supply voltage (V) is E (YES), the flow advances to step S34, the control means 20 is a compressor 61 sensed by the current sensing means (65) Discriminate whether or not the current consumption (I) of is greater than the preset reference current data (le: the current consumption of the compressor which is determined to have completely removed the frost formed on the outdoor heat exchanger when the input power supply voltage is 220V or more and less than 230V). .

As a result of the discrimination in step S34, when the current consumption I of the compressor 61 is not greater than or equal to the reference current data le (NO), frost formed on the outdoor heat exchanger 55 is not completely removed. If it is determined that the state is returned to step S15, the operation of step S15 or less is repeated, and if the current consumption I of the compressor 61 is equal to or greater than the reference current data le (YES), the outdoor heat exchanger 55 In step S27, it is determined that the frost conceived in step 2) has been completely removed, and the operation of step S27 and below is repeated.

In addition, when the determination result in step S23 indicates that the input power supply voltage V is F (YES), the process proceeds to step S35, whereby the control means 20 detects the compressor 61 detected by the current sensing means 65. Discriminate whether the current consumption (I) of the power supply is greater than the preset reference current data (If: the current consumption of the compressor that is determined to have completely removed the frost formed on the outdoor heat exchanger when the input power supply voltage is more than 230V and less than 240V). .

As a result of the determination in step S35, when the current consumption I of the compressor 61 is not equal to or greater than the reference current data If (NO), frost formed on the outdoor heat exchanger 55 is not completely removed. If it is determined that the state is returned to step S15 and the operation of step S15 or less is repeated, and the current consumption I of the compressor 61 is equal to or greater than the reference current data If (YES), the outdoor heat exchanger 55 In step S27, it is determined that the frost conceived in step 2) has been completely removed, and the operation of step S27 and below is repeated.

As a result of the discrimination in step S24, when the input power supply voltage V is G (YES), the flow advances to step S36, whereby the control means 20 detects the compressor 61 detected by the current sensing means 65. Discriminate whether the current consumption (I) is greater than or equal to the preset reference current data (Ig: current consumption of the compressor which is determined to have completely removed frost formed on the outdoor heat exchanger when the input power supply voltage is more than 240V and less than 250V). .

As a result of the discrimination in step S36, when the consumption current I of the compressor 51 is not more than the reference current data 1g (NO), frost formed on the outdoor heat exchanger 55 is not completely removed. It is determined that the state is returned to step S15 and the operation of step S15 or less is repeated, and when the current consumption I of the compressor 61 is equal to or greater than the reference current data Ig (YES), the outdoor heat exchanger 55 In step S27, it is determined that the frost conceived in step 2) has been completely removed, and the operation of step S27 and below is repeated.

On the other hand, when the determination result in step S5 indicates that the input power supply voltage V sensed by the input voltage detecting means 25 is an abnormal voltage (less than 180 V and more than 260 V) (YES), the compressor 61 Since it is necessary to protect the compressor 61 by preventing excessive driving, the control means 20 outputs a control signal for stopping the compressor 61 to the compressor driving means 60.

Therefore, the compressor driving means 60 ends the operation while stopping the compressor 61 under the control of the control means 20.

As a result of the determination in step S25, when the input power supply voltage V is not H (NO), the input voltage of the commercial AC power supply supplied from the AC power supply input terminal during the defrosting operation of the air conditioner is abnormal. Since the voltage (less than 180V, 260V or more), the process proceeds to the step S40 described above and repeats the operation of the step S40 or less.

According to the defrosting apparatus and the control method of the air conditioner according to the present invention as described above, by accurately determining the freezing state of the outdoor heat exchanger according to the changing input power voltage of the AC power input terminal to the outdoor heat exchanger during heating operation. Not only can the frost form be completely removed, but the heating efficiency can be improved. When the input power supply voltage is an abnormal voltage, the compressor can be stopped to prevent excessive operation of the compressor. .

Claims (3)

An air conditioner comprising: an indoor piping temperature sensing means for sensing a pipe temperature of an indoor heat exchanger that is changed during a heating operation of the air conditioner, and an outdoor temperature for sensing an outdoor temperature that is changed during a heating operation of the air conditioner A sensing means, a current sensing means for sensing a current consumption of the compressor which is changed during the defrosting operation, an input voltage sensing means for sensing an input power supply voltage changing during the defrosting operation, and the indoor piping temperature sensing means. The defrosting operation is controlled by determining whether the outdoor heat exchanger is implanted according to the indoor piping temperature and the outdoor temperature detected by the outdoor temperature sensing means, and the defrosting operation is controlled according to the input power voltage sensed by the input voltage sensing means. Adjust the reference current and compare the reference current of the compressor and the current consumption of the compressor sensed by the current sensing means to the outdoor thermal bridge Control means for controlling the defrosting operation by determining whether the frost formed on the ventilation is removed, Four-way valve driving means for controlling the four-way valve to change the flow path through which the refrigerant circulates under the control of the control means, and the control means Defroster of the air conditioner, characterized in that the compressor drive means for controlling the drive to perform the defrosting operation under the control of. Refrigerant circulates during the defrosting step of determining the defrosting condition of the outdoor heat exchanger according to the indoor piping temperature, the outdoor temperature, and the operating time of the compressor which change during the heating operation of the air conditioner, and the defrosting condition during the defrosting condition in the defrosting step. A flow path changing step for changing the flow path to the cooling operation; a defrosting step for performing defrosting to remove frost formed on the outdoor heat exchanger according to the refrigerant flow path changed in the flow path changing step; and defrosting in the defrosting step. A current sensing step of sensing a current consumption of the compressor that changes in operation, a voltage sensing step of sensing an input power supply voltage changing in the defrosting operation of the defrosting operation step, and an input power source detected in the voltage sensing step A current adjusting step of adjusting the reference current of the compressor according to the voltage, and a reference current of the compressor adjusted in the current adjusting step The defrosting control step of the air conditioner, characterized in that the defrosting determination step of determining the defrosting release condition compared to the current consumption of the compressor sensed in the current sensing step. The air conditioner according to claim 2, wherein in the defrost release determining step, if the current consumption of the compressor is equal to or greater than the reference current, the defrost release condition is determined, and a heating operation is performed by changing a flow path through which the refrigerant circulates. Defrost Control Method.