KR19980023142A - Control method of sterilization lamp for refrigerator - Google Patents

Abstract

The present invention proposes a sterilization lamp control technology in a refrigerator equipped with a sterilization lamp.

A feature of the present invention is a microcomputer control method for driving on / off a sterilization lamp installed in a room by receiving a door open and a closed signal input by a door switch, and opening a door detected by a door switch in a normal operation mode of a refrigerator. Determining a time point, applying a maximum driving power continuously to the sterilization lamp according to the output of the microcomputer when the door open is detected by the microcomputer, and closing the door in the continuous driving mode of the sterilization lamp. And applying driving power halved to the germicidal lamp by a power control element controlled by the distribution angle according to the output of the microcomputer when detected at.

The present invention can be taken to minimize the increase in the temperature inside the high temperature sterilization lamp operation and also to reduce the power consumption of the refrigerator.

Description

Control method of sterilization lamp for refrigerator

The present invention relates to a sterilization apparatus installed in the refrigerator, and particularly, a sterilization lamp for a refrigerator which can avoid the problem of temperature rise due to continuous operation of the sterilization lamp installed in the refrigerating chamber and also reduce power consumption in the refrigerator. It relates to a control method of.

A flow piping diagram of a refrigerant for freezing in a general refrigerator is shown in FIG. 1.

As referred to herein, the high temperature refrigerant compressed by the compressor 10 is cooled by passing through the auxiliary heat dissipation pipe 11, the hot pipe 12, the thick plate pipe 13, and the wire condenser pipe 14, and then the dryer. Connect to (15).

The refrigerant passing through the dryer 15 is connected to the heat exchanger in the cooler 17 via the capillary tube 16, and the refrigerant passing through the heat exchanger 17 passes through the accumulator 18 to the compressor 10. Connect to supply.

The refrigeration cycle in such a refrigerator will be described in detail as follows.

First, the compressor 10 compresses a refrigerant, such as a freon gas, at high temperature and high pressure, and sends it out to the auxiliary heat dissipation pipe 11.

The auxiliary heat dissipation pipe 11 is disposed in a defrost water storage evaporation bowl installed at the lower end of the refrigerator, and the second heat dissipation pipe 11 is disposed in the evaporation bowl by a high temperature (70 ° C. to 80 ° C.) refrigerant flowing through the auxiliary heat dissipation pipe 11. Allow the constant to evaporate.

At this time, a dual effect is obtained in which the high temperature refrigerant is somewhat cooled.

The refrigerant passing through the auxiliary heat radiation pipe 11 passes through the hot pipe 12.

The hot pipe 12 is installed so as to pass through the front part of the inside of the refrigerator of the door side of the refrigerator, the function of the hot pipe 12 is the dew condensation phenomenon caused by the difference between the internal temperature and the external temperature when replacing the refrigerator indoor and outdoor air according to the door opening. To remove it.

Thereafter, the refrigerant is sufficiently cooled while passing through the thick plate pipe 13 and the wire condenser pipe 14 to become a liquefied state, and then passes through the dryer 15.

The refrigerant cooled from the high temperature while passing up to the wire condenser pipe 14 may generate moisture according to the temperature difference between the internal and external air in the pipe through which the refrigerant flows, and may be included in the liquid refrigerant.

If the heat exchange as it is, the cooling efficiency is significantly reduced by the heat exchange coefficient difference between the refrigerant and water.

Therefore, as a countermeasure against this phenomenon, the dryer 15 is provided at the rear end of the wire condenser pipe 14 so that the moisture component contained in the liquid refrigerant is removed therefrom.

The low temperature and high pressure refrigerant from which moisture is removed while passing through the dryer 15 is supplied to a capillary tube (capillary tube) 16.

In the capillary tube 16, the pressure of the refrigerant is rapidly adiabaticly expanded from high pressure to low pressure to make the refrigerant at low temperature and low pressure. In this process, a temperature drop of about -30 ° C can be obtained.

The low temperature low pressure liquid refrigerant passing through the capillary tube 16 rapidly vaporizes in the cooler 17 and takes the ambient temperature to create cold air to be supplied to the freezer compartment and the refrigerating compartment.

The accumulator 18 separates the liquid refrigerant that has not been sufficiently vaporized from the cooler 17 and serves to supply only the pure gaseous refrigerant to the compressor 10.

By the operation of the cooling cycle, the cold air heat-exchanged in the cooler 17 is introduced into the freezer compartment and the refrigerating compartment through the freezer compartment cold air vent and the refrigerating compartment cold air outlet, respectively.

On the other hand, the cold air circulated in the freezer compartment is recovered through the freezing cold air inlet provided at the bottom of the freezer compartment, and the cold air circulated in the freezer compartment is recovered through the cold air inlet provided at the top of the refrigerating compartment, and the conception is made first on the plate.

The cold air thus recovered is again cooled by the cooler and supplied to the freezing compartment and the refrigerating compartment, respectively.

Defrost heater is installed at the lower end of the cooler 17, when the frost occurs in the cooler 17, when the cooling efficiency is lowered, defrosting of the cooler is achieved by heating the defrost heater.

The defrost heater is driven by a microcomputer based on data such as a continuous operating time of the compressor, a temperature change in a high temperature, and the like, and is turned off by a defrost detection signal from a frost sensor.

If food is stored for a long time inside a refrigerator operating with such a refrigeration cycle and control system, the food is likely to decay.

Therefore, in recent years, as a device for suppressing bacterial propagation in the food stored in the refrigerator has been proposed a technology for installing a sterilization lamp separately from the lamp in the refrigerator.

Sterilization lamps applied in this technology are commonly coated with infrared transparent coatings on general transparent lighting lamps to generate infrared wavelengths with sterilization effect.

However, until now, the drive current is always supplied to the sterilization lamp irrespective of opening or closing of the door, so that the internal temperature rises due to the heat generated by the sterilization lamp, which leads to rapid decay of food stored in the interior. There is a problem.

In addition, the continuous lighting of the sterilization lamp in the oven will eventually increase the power consumption of the refrigerator.

An object of the present invention is to control the sterilization lamp for refrigerators that can effectively control the point of the sterilization lamp to prevent the bacteria propagation of the food stored in the high storage to minimize the rise of the internal temperature and also to minimize the power consumption related to the point of the sterilization lamp. To provide a method.

A feature of the present invention is a microcomputer control method for driving on / off a sterilization lamp installed in a room by receiving a door open and a closed signal input by a door switch, and opening a door detected by a door switch in a normal operation mode of a refrigerator. Determining a time point; if the door is detected by the microcomputer by the step, applying a maximum driving power to the sterilization lamp according to the output of the microcomputer; and closing the microcomputer in the continuous driving mode of the sterilization lamp. The control method of the sterilization lamp for a refrigerator comprising the step of applying the drive power halved to the sterilization lamp by the power control element controlled by the distribution angle in accordance with the output of the microcomputer.

1 is a refrigeration piping diagram for explaining a refrigeration cycle in a typical refrigerator.

2 is a circuit diagram of a refrigerator control system for implementing the present invention.

Figure 3 is a graph for explaining the power control process of the sterilizing lamp according to the present invention.

4 is a flowchart for explaining the present invention.

＊＊ Explanation of symbols for main parts of drawings *＊

20: microcomputer 21: door switch

22: door switch detection circuit 23: power control circuit

24: sterilization lamp

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

2 is a block diagram of a sterile lamp driving control circuit for applying to the present invention, the door open and closed contact signal detected by the door switch 21 is processed to the microcomputer input signal level in the door sensor circuit 22 to the microcomputer ( 20) to be applied.

The sterilization lamp driving control signal output from the microcomputer 20 is applied to the power control circuit 23 and connected to selectively limit the amount of power to be supplied to the sterilization lamp 24.

The power control circuit 23 includes a power control element for controlling the distribution angle of the thyristor series.

When describing the present invention based on the hardware configuration for the sterilization lamp drive control as follows.

Figure 3 shows the voltage waveform to be put into the sterilization lamp in accordance with the open and closed conditions of the door.

3A shows a waveform of a commercial AC voltage supplied to the power control circuit 23.

3B shows a voltage waveform in the first power control mode (power control mode I) supplied from the power control circuit 23 to the sterilization lamp 24 side when the door is closed.

3C shows a voltage waveform in the second power control mode (power control mode II) supplied from the power control circuit 23 to the sterilization lamp 24 side when the door is opened.

The driving voltage for the sterilization lamp which is controlled by the power control circuit and output is made by the microcomputer control that determines the opening and closing of the door of the refrigerator through the door switch.

The process will be described with reference to FIG. 4.

In the normal operation mode in which the refrigerator operates based on the data value set by the user, the door switch detection circuit 22 determines whether the door switch 21 generates a contact signal and gives the result to the microcomputer 20. The microcomputer performs the step of determining a door opening time.

When the opening of the door is detected by the microcomputer in the step, the microcomputer outputs a control command for controlling the sterilization lamp 24 to the full voltage applied to the power control circuit 23.

Accordingly, the sterilization lamp 24 executes the first power control mode (power control mode I) step of applying the continuous maximum driving power from the power control circuit as shown in Fig. 3C.

The maximum power continuous drive mode of the sterilization lamp continues until the door close is detected by the microcomputer 20.

Then, when the door close by the door switch 21 is detected by the microcomputer 20, the microcomputer causes the magnitude of the voltage to be supplied to the sterilization lamp 24 to be controlled by the distribution angle by the power control circuit 23 to supply the thyristor. A second power control mode (power control mode II) of applying the driving power whose size is halved to the sterilization lamp by the power control circuit composed of a power control element as shown in FIG. Will be performed.

Therefore, when the door is opened, there is almost no influence of the internal temperature due to the heat generated by the germicidal lamp. At this time, sterilization is performed at the maximum efficiency, and when the door is closed, the sterilization is minimized by the reduction of the output of the sterilizing power. This will be done.

According to the present invention as described above, in the refrigerator equipped with a sterilizing lamp to prevent bacterial growth of food in the refrigerator, the sterilizing lamp is always operated at full power regardless of the internal temperature condition or the opening and closing of the refrigerator door. The unique effect of suppressing the high temperature rise problem and unnecessary power loss will appear.

Claims (1)

A microcomputer control method for driving a sterilization lamp installed in a room on / off by receiving a door open and a closed signal input by a door switch, the method comprising: determining a door opening time detected by a door switch in a normal operation mode of a refrigerator; And, if the door is detected by the microcomputer by the above steps, applying the maximum driving power to the sterilization lamp according to the output of the microcomputer; and when the door close is detected by the microcomputer in the continuous driving mode of the microcomputer, And applying driving power halved to the sterilization lamp by a power control element controlled by the distribution angle according to the output.