KR100301502B1 - Method for controlling operation of inverter refrigerator - Google Patents

Abstract

The present invention relates to a method for controlling the operation of an inverter refrigerator. In the related art, the compressor is operated by a sensed temperature difference regardless of the size of a load placed in the refrigerator, regardless of whether the load is large or small, so that the actual load is detected before reaching a predetermined temperature. Since the sensor temperature falls within the set temperature range and judges that the internal temperature is stable, the frequency is lowered and the operation is performed. Therefore, the loaded load maintains a high temperature state for a long time and causes food to be deteriorated. Since it affects the sensor even at the time of opening, frequent frequency conversion occurs due to the difference from the set temperature, which causes noise to increase power consumption. Therefore, the present invention provides a first step of operating the compressor for a predetermined time after starting the compressor when the load is input, and a second step of detecting the freezer compartment temperature after the predetermined time operation and comparing it with the set temperature, and wherein the freezer compartment temperature is the set temperature. If it is higher than the third step of operating for a predetermined time at a high rotational frequency for a predetermined time and proceeds to the second step, and the fourth step of intermittent operation of the compressor when the freezer compartment temperature reaches the set temperature in the second step, and The fifth step of measuring the compressor off time during the intermittent operation, and the sixth step to perform the intermittent operation at a lower rotation frequency if the compressor off time is longer than the set time, and operates at a higher rotation frequency Stabilizes the temperature to the inside of the load within a short time, and unnecessary high frequency operation when low load is applied or when the door is opened. It is possible to minimize the power consumption according, to one so as to minimize the operation of the frequency of the compressor temperature sensor which is also sensitive under non-steady state, the temperature inside the food storage.

Description

Operation control method of inverter refrigerator {METHOD FOR CONTROLLING OPERATION OF INVERTER REFRIGERATOR}

The present invention relates to an operation control method of an inverter refrigerator capable of responding to a load. In particular, the present invention relates to an efficient operation control according to a load amount by efficiently detecting an input load amount, thereby reducing power consumption and maintaining freshness of stored foods. It relates to an operation control method of an inverter refrigerator.

Conventional refrigerator operation control method, the first step (S1) of comparing the internal temperature and the set temperature of the refrigerator, and when the internal temperature of the refrigerator is higher than the set temperature in the first step (S1) step by step to lower the rotation frequency to rotate the compressor The second step (S2) of lowering the number, and the third step (S3) to maintain a constant rotation frequency by recognizing the internal temperature stable interval if the internal temperature of the refrigerator is not different from the set temperature in the above.

Looking at the prior art made of each step as follows.

If a load is applied to the refrigerator or the refrigerator doors are frequently opened and closed, the temperature inside the refrigerator should be adjusted to keep the food fresh for a long time and prevent food from deteriorating.

Then, a method of maintaining a constant internal temperature of the refrigerator will be described. First, the internal temperature of the refrigerator is measured, and the measured internal temperature of the refrigerator is compared with the set temperature.

As a result of the comparison, when the internal temperature of the refrigerator is higher than the set temperature, the compressor rotation speed is increased at a high rotation frequency.

Then, the internal temperature of the refrigerator is slightly lowered by the high compressor speed.

Again, the rotation frequency is adjusted by comparing the internal temperature of the refrigerator with the set temperature, and the compressor is operated by gradually lowering the rotation frequency as shown in FIG. 1 (b) according to the internal temperature of the refrigerator as shown in FIG.

When operating in the same way as above, if there is no difference between the internal temperature of the refrigerator and the set temperature, it is recognized as the internal temperature stability section and maintained at a constant frequency, that is, 40 Hz.

In this way, the internal temperature of the refrigerator is kept constant.

However, in the prior art as described above, since the compressor is operated by the sensed temperature difference regardless of the magnitude of the load to be put into the refrigerator, the sensor sensor temperature is set before the actual load reaches a predetermined temperature or less. It is determined that the internal temperature is stable, and the operation is performed by lowering the frequency. Therefore, the loaded load maintains a high temperature for a long time and causes food to be deteriorated. Since it affects the sensor, frequent frequency conversion occurs due to a difference from the set temperature, thereby increasing noise and power consumption.

Accordingly, an object of the present invention for solving the conventional problems as described above is to provide an operation control method of the inverter refrigerator to significantly reduce the power consumption of the compressor by performing an appropriate operation in accordance with the load applied.

Another object of the present invention is to provide an operation control method of the inverter refrigerator to minimize power consumption by operating by varying the rotation frequency according to the time measured from the time of starting the compressor when the door opening is detected.

Another object of the present invention is to provide an operation control method of the inverter refrigerator to minimize the power consumption and to minimize the operation of the compressor by operating by varying the rotation frequency according to the time measured from the time of opening the door when detecting the door opening. have.

1 is a schematic view of a conventional inverter refrigerator.

2 is a circuit diagram showing the configuration of a conventional inverter refrigerator.

3 is a temperature and frequency characteristic diagram showing a rotation frequency according to the conventional refrigerator compartment temperature.

Figure 4 is a compressor rotation frequency characteristics according to the present invention freezer compartment internal temperature and load input amount.

*** Explanation of symbols for main parts of drawing ***

21: key input unit 22: internal temperature detection unit

23: microcomputer 24: compressor drive unit

25: inverter drive unit 26: fan motor / damper drive unit

31 compressor 32 freezer

33: refrigerator compartment 34: evaporator

35: damper 36: fan motor

37: refrigeration sensor 38: refrigeration sensor

The present invention for achieving the above object is a first step of operating the compressor for a predetermined time after starting the compressor at the time of load, the second step of detecting the freezer compartment temperature after a predetermined time operation and comparing with the set temperature, and If the freezer compartment temperature is higher than the set temperature, the compressor operates at a higher rotational frequency for a predetermined time and then proceeds to the second stage, and if the freezer compartment temperature reaches the set temperature in the second stage, the compressor is rotated to the current rotational frequency. The fourth step of intermittent operation; the fifth step of measuring the compressor off time during the intermittent operation; and if the compressor off time is longer than the set time, it is determined that the temperature is stable to the inside of the load, Characterized in that the sixth step to perform the intermittent operation.

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

The operation control method of the inverter refrigerator of the present invention includes a first step of operating a compressor for a predetermined time after starting a compressor when a large load is input, and a second step of detecting a freezer compartment temperature after a predetermined time operation and comparing it with a set temperature; If the freezer compartment temperature is higher than the set temperature in the third step of operating for a predetermined time at a higher rotational frequency and proceeds to the second step, and when the freezer compartment temperature reaches the set temperature in the second step, the compressor rotates the current rotational frequency Step 4 for intermittent operation, step 5 for measuring the compressor off time during the intermittent operation, and when the compressor off time is longer than the set time, it is determined that the temperature is stable to the inside of the load. The sixth step is to perform an intermittent operation.

In addition, the operation control method of the inverter refrigerator according to the present invention checks whether the target temperature is reached by sensing the freezer temperature after a predetermined time operation after operating the compressor for a predetermined time after starting the compressor upon detecting a small load or opening of the door. A second step of performing an intermittent operation at a current rotation frequency when the target temperature is reached; a fourth step of measuring a time for reaching the intermittent operation from the time of starting the compressor; If the time measured in step 4 is within a certain time, the current rotation frequency is maintained at an intermittent operation, and if it is not within a predetermined time, a fifth step is performed to switch to a higher speed.

As shown in FIG. 2, the circuit configuration of the inverter refrigerator for performing the method consisting of each step includes a key input unit 21 for selecting the operation function of the refrigerator as a key, and an internal temperature of the freezer compartment and the refrigerating compartment. In order to control the temperature of the freezer compartment and the refrigerating compartment according to the input from the internal temperature sensor 22 and the key input unit 21 and the internal temperature sensor 22 to transmit various control signals to each of the necessary parts A microcomputer 23, a compressor driver 24 for driving a compressor necessary for cooling the freezer compartment and the refrigerating compartment of the refrigerator according to the control signal of the microcomputer 23, a voltage and a rotation frequency for driving the compressor. Inverter drive unit 25 for providing a fan motor / for controlling the operation of the fan motor and damper for supplying cold air to the freezer compartment and the refrigerating compartment The drive unit consists of a buffer (26).

3 is a schematic view showing an inverter refrigerator, and as shown in FIG. 3, an evaporator for cooling the freezer compartment 32 and the refrigerating compartment 23 while changing the low temperature low pressure refrigerant from the compressor 31 into a gas state. 34), a damper 35 for supplying or blocking cold air from the freezing chamber 32 to the refrigerating chamber 33 to control the temperature of the refrigerating chamber, and a freezing unit for cooling the cold air to the freezing chamber 32 by acting as a cold air circulation. A refrigeration fan motor 36 for driving the fan, a freezing sensor 37 for detecting the internal temperature of the freezing chamber 32, and a refrigerating sensor 38 for detecting the internal temperature of the refrigerating chamber 33.

Referring to the operation and effect of the present invention configured as described in detail as follows.

In FIG. 2, when the control function key of the inverter refrigerator is input from the key input unit 21, the microcomputer 23 first controls the inverter driver 25 to drive the compressor 31 of FIG. 3. Supply a rotation frequency of 60 Hz.

The microcomputer 23 then controls the compressor driver 24 to provide a drive signal to the compressor 31.

Thus, the compressor motor maintains 3600 RPM, driving the compressor 31.

The compressor 31 is driven to compress the gaseous refrigerant at high temperature and high pressure, and supply the compressed refrigerant to the evaporator 34.

Accordingly, the evaporator 34 cools the freezer compartment 32 while absorbing heat in the freezer compartment 32 and releasing it to the outside.

Then, the microcomputer 23 drives the fan motor 36 through the fan motor / damper driver 26 for cold air circulation.

Accordingly, the fan motor 36 is driven to blow cold air.

As a result, the freezing chamber 32 is cooled.

When the cooling is performed in this way, the microcomputer 23 reads the temperature of the freezing chamber 32 from the freezing sensor 37 attached to the freezing chamber 32 through the internal temperature sensing unit 22.

When the temperature of the freezer compartment 32 thus read reaches the set temperature, the microcomputer 23 stops the operation of the compressor 31 through the compressor drive unit 24.

In addition, the damper 35 is turned on or off to control the cold air of the refrigerating compartment 33, thereby controlling the temperature in the refrigerating compartment refrigerator in an operation of supplying or blocking cold air of the freezing compartment 32 to the refrigerating compartment 33.

That is, the microcomputer 23 controls the fan motor / damper driver 26 to turn on the damper 35.

Then, the cold air of the freezer compartment 32 is transmitted to the refrigerator compartment 33, and the temperature of the refrigerator compartment 33 falls.

Then, the internal temperature of the refrigerating chamber is sensed through the refrigerating sensor 38, and the detected temperature is read through the internal temperature detecting unit 22.

When the internal temperature of the refrigerating chamber thus read reaches the target temperature, the microcomputer 23 turns off the damper 35 through the fan motor / damper driving unit 26 to block the cold air from the freezing chamber 32.

When the load is applied to the refrigerator while performing such an operation, the microcomputer 23 starts the compressor 31 through the compressor driving unit 24, and for a predetermined time t1 as shown in FIG. 4 from the starting point of the compressor. Drive.

At this time, the operating frequency is 40Hz.

When the compressor 31 operates as described above, the microcomputer 23 detects the freezer compartment temperature detected by the freezing sensor 37 through the internal temperature sensor 22.

If the detected freezer temperature does not fall below a certain temperature T as shown in FIG. 4 (b) even when the freezer temperature is operated for a predetermined time t1, the microcomputer 23 determines that the food has a large load and the inverter driver 25. By operating the compressor (31) at a higher rotational frequency, that is, 60Hz through)) to increase the freezing capacity.

When the compressor 31 is driven at the rotation frequency of 60 Hz to lower the temperature of the freezing chamber 32 to reach the target temperature, the microcomputer 23 performs the intermittent operation of the compressor 31 at the current rotation frequency of 60 Hz. do.

When the intermittent operation is performed, if the internal temperature detected by the freezing sensor 37 and the internal temperature sensor 22 is a target temperature, the compressor 31 is turned off. ) To operate.

When intermittent operation is performed in this manner, the microcomputer 23 compares the compressor off time and the set time, and if a phenomenon longer than the set time occurs, determines that the temperature is stable up to the load inside the refrigerator. Intermittent operation should be performed at 40Hz, the rotation frequency lower than 60Hz.

In other words, if a food with a heavy load is put in the freezer compartment by operating it at a rotational frequency of 40 Hz for a certain time (t1), but if the internal temperature of the freezer does not reach the desired temperature, it operates at a rotational frequency of 60 Hz, one step higher than the current rotational frequency. Until it reaches the desired temperature.

When the desired temperature is reached, intermittent operation is performed at the current rotation frequency. During this intermittent operation, the compressor off time is checked, and if the phenomenon occurs longer than the set time, it is judged that the temperature is stable to the inside of the loaded load. Intermittent operation at frequency controls the freezer temperature.

And when a small load of food is put in or when the door is opened and closed to take out the food in the high, the microcomputer 23 starts the compressor 31 through the compressor drive unit 24, as shown in FIG. Operate for a predetermined time (t1).

At this time, the operating frequency is 40Hz.

When the compressor 31 operates as described above, the microcomputer 23 detects the freezer compartment temperature detected by the freezing sensor 37 through the internal temperature sensor 22.

When the detected freezer temperature reaches the target temperature, the microcomputer 23 intermittently operates the compressor 31 at 40 Hz, which is the current rotation frequency, through the compressor driver 24 and the inverter driver 25, as shown in FIG. 4. Let's do it.

Then, the microcomputer 23 measures the time at which the compressor 31 reaches the intermittent operation when the compressor 31 starts the intermittent operation, and maintains the current rotational frequency when the measured time is within a predetermined time. If not within a certain period of time, switch to the next higher speed to operate.

In addition, the same effect can be obtained even if the operation is controlled by measuring the predetermined time t1 measured from the starting point as described above from the opening point of the door.

Therefore, the present invention operates at a higher rotational frequency when high load food is input, stabilizes the temperature to the inside of the load within a short time, and prevents the deterioration of the stored food, and at the time of low load input or the door is opened. In this case, it is possible to minimize power consumption due to unnecessary high frequency operation, and to minimize the frequent operation of the compressor by a temperature sensor that reacts sensitively even when the temperature inside the stored food is not stable.

Claims (3)

A first step of operating the compressor for a predetermined time after starting the compressor upon loading the load; and a second step of detecting the freezer compartment temperature after the predetermined time operation and comparing it with the set temperature; and a step if the freezer compartment temperature is higher than the set temperature. A third step of operating at a high rotational frequency for a predetermined time and proceeding to the second step; and a fourth step of intermittently operating the compressor when the freezer compartment temperature reaches the set temperature in the second step, and during the intermittent operation. And a fifth step of measuring a compressor off time and a sixth step of intermittent operation at a lower rotational frequency when the compressor off time is longer than a predetermined time. The method of claim 1, wherein the rotation frequency of one step higher in the third step is 60Hz. The method of claim 1, wherein the rotation frequency lower by one step in the sixth step is 40 Hz.