KR19980073243A - Compressor drive control method of refrigerator and its control device - Google Patents

Abstract

The present invention detects a change in the power supply voltage applied to the compressor of the refrigerator and adjusts it so that the optimum power supply voltage is always applied to the compressor so that the operation of the compressor is in an optimal state and the power consumption of the refrigerator is reduced. A compressor drive control method and a control device therefor. Compressor driving control method of the refrigerator of the present invention for this purpose, the first step of recognizing the magnitude of the power voltage input to the refrigerator, the voltage applied to the compressor of the refrigerator according to the magnitude of the voltage recognized in the first step And a third step of varying the magnitude of the power supply voltage so as to be constant, and a third step of applying the voltage changed in the second step to the compressor to drive the compressor, and the compressor of the refrigerator of the present invention. The driving control apparatus includes an input power supply voltage sensing means for sensing a magnitude of an input power supply voltage and a duty adjustment for providing a constant voltage to the compressor according to the magnitude of the input power supply voltage connected in common with the input power supply voltage detection means. Duty adjusting means for outputting a pulse and a voltage such that the voltage applied to the compressor is a voltage having a predetermined magnitude; A voltage varying means for varying the voltage, a voltage varying means, a power supply voltage sensing means, and a duty adjusting means respectively receiving input signals of the power supply voltage sensing means and the duty adjusting means and applying the voltage varying means to the compressor; And control means for controlling and driving the voltage to be a voltage having a predetermined magnitude. As a result, the present invention provides an advantage of solving the noise / vibration problem of the compressor due to the change in the power supply voltage, and the advantage of reducing the power consumption of the refrigerator.

Description

Compressor drive control method of refrigerator and its control device

The present invention relates to a compressor driving control method of a refrigerator and a control device thereof, and more particularly, to detect a change in a power supply voltage applied to a compressor and to adjust the same so that an optimum power supply voltage is always applied to the compressor. The present invention relates to a compressor driving control method of a refrigerator and a control apparatus thereof in which an optimum state is achieved and power consumption of the refrigerator is reduced.

Generally, a refrigerator includes components such as a compressor, a condenser, a capillary tube, and an evaporator. In a refrigerator including the above components, a predetermined refrigerant is changed from liquid to gas and gas to liquid while circulating the components, and the temperature inside the refrigerator is lowered by the circulation of the refrigerant. . 1 schematically shows a refrigerant circulation cycle of a refrigerator.

Referring to FIG. 1, the liquid refrigerant in the evaporator 1 gradually evaporates around the evaporator 1 while losing heat necessary for evaporation, that is, latent heat of evaporation. The ambient air deprived of heat is cooled and circulated by natural convection or the fan 2 to keep the inside of the refrigerator at a low temperature. In the evaporator 1, the liquid refrigerant sent from the capillary tube 7 and the evaporated gas refrigerant coexist, and a state change from liquid to gas occurs. As described above, the refrigerant evaporated in the evaporator 1 flows into the compressor 3, and the compressor 3 compresses the introduced refrigerant into a state in which the refrigerant can be easily liquefied by air at room temperature. Made of gaseous refrigerant. The high temperature and high pressure gas refrigerant leaving the compressor 3 is heat-exchanged by ambient air at room temperature in the condenser 5 to become a liquid refrigerant at room temperature and high pressure. The heat released from the condenser 5 is the heat of condensation. The liquid refrigerant of normal temperature and high pressure which changed state in the condenser 5 turns into the liquid refrigerant of normal temperature and low pressure, passing through the capillary tube 7. The capillary tube 7 acts to depressurize the liquid refrigerant at room temperature and high pressure, which has been changed in the condenser 5, to a state that is easy to evaporate before being sent to the evaporator 1. The capillary tube 7 also functions to control the flow rate of the liquid refrigerant in addition to the action of lowering the pressure as described above. Reference numeral 6 is a fan for the condenser.

In the refrigerator having the above configuration, the driving of the compressor changes the refrigerant flowing into the refrigerant having a high temperature and high pressure by varying the rotation speed and the compression capacity according to the change of the input power voltage.

However, in the conventional refrigerator, when the input power supply voltage is low during the drive control of the compressor, for example, 200 volts or less, if the predetermined voltage variable control (or phase control) is performed, the compressor does not start smoothly. There was this. In addition, when the input power supply voltage is applied to the compressor as it is, there is a problem that the noise / vibration occurs in the compressor in accordance with the change in the power supply voltage.

The present invention has been made to solve the above problems, by measuring the voltage value applied to the compressor through a predetermined voltage sensing means through which the voltage variable control to a voltage value suitable for the minimum power consumption value, through It is an object of the present invention to provide a compressor driving control method and a control apparatus of the refrigerator which can improve the compressor efficiency of the refrigerator and reduce power consumption by driving the compressor.

1 is a schematic view showing a refrigerant circulation cycle of a typical refrigerator;

2 is a block diagram showing a compressor driving control apparatus of a refrigerator according to the present invention;

3 is a flowchart of a compressor driving control method of a refrigerator according to the present invention;

Explanation of symbols for main parts of the drawings

3: compressor 4: rectifier

6 power supply voltage detection unit 8: duty adjustment unit

10 control unit 12 voltage variable unit

Compressor drive control method of the refrigerator according to the present invention to achieve the above object,

In the method for driving control of the compressor of the refrigerator,

A first step of recognizing the magnitude of the power supply voltage input to the refrigerator, and a step of varying the magnitude of the power supply voltage such that the voltage applied to the compressor of the refrigerator is constant according to the magnitude of the voltage recognized in the first step. It is characterized in that it comprises a second step, and a third step of applying a voltage changed in the second step to the compressor to drive it.

In a preferred embodiment of the present invention, when 220 volts of commercial AC power is used as the power supply voltage, a voltage finally applied to the compressor is about 200 volts, and the second step is an applied voltage to the compressor. Duty-controlling the input power supply voltage to match 200 volts.

In addition, the compressor drive control apparatus for a refrigerator according to the present invention for implementing the compressor drive control method of the refrigerator,

In the apparatus for driving control of the compressor of the refrigerator,

An input power voltage sensing means for sensing a magnitude of an input power voltage and a duty connected to the input power voltage sensing means in common and outputting a duty adjustment pulse for providing a constant voltage to the compressor according to the magnitude of the input power voltage A voltage varying means for varying a voltage so that a voltage applied to the compressor is a voltage of a predetermined magnitude; and connected to the voltage varying means, the power supply voltage sensing means, and the duty adjusting means, respectively; It is characterized in that it comprises a control means for receiving the output signal of the duty adjustment means for controlling the voltage variable means to drive the voltage applied to the compressor to a voltage of a predetermined magnitude.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the compressor drive control method and a control device of the refrigerator according to the present invention.

Compressor driving control method and a control device of the refrigerator according to the present invention is to reduce the power consumption of the refrigerator and to ensure the efficiency of the compressor by constantly applying a voltage of a predetermined size to the compressor regardless of the fluctuation of the power supply voltage applied to the refrigerator As shown in FIG. 2, the input power supply voltage sensing unit 6 sensing the magnitude of the input power supply voltage and the input power supply voltage sensing unit 6 are commonly connected to the input power supply voltage as shown. Accordingly, the duty adjuster 8 outputs a duty adjustment pulse for providing a voltage of a predetermined magnitude to the compressor 3, and a voltage variable part that varies the voltage so that the voltage applied to the compressor 3 becomes a voltage of a predetermined magnitude ( 12) and connected to the voltage varying part 12, the power supply voltage sensing section 6, and the duty adjusting section 8, respectively, and input the respective output signals of the power supply voltage sensing section 6 and the duty adjusting section 8, respectively. Receiving a variable voltage unit 12 the voltage applied to the compressor (3) is made by a control unit 10 which controls the driving voltage so that a predetermined size. Here, the control unit 10 includes a microcomputer 11 having an A / D conversion unit 11 'for converting predetermined analog information into digital information. In addition, the present invention rectifies the voltage output from the transformer 2 and the transformer 2 for converting the input power supply voltage into a predetermined magnitude, and the rectifier 4 for supplying it to the power supply voltage detector 6 and the duty controller 8 ). Here, the power supply voltage detector 6 is made of distribution resistors R1 and R2. Reference numeral R2 denotes a current limiting resistor, and C denotes a noise removing capacitor.

With reference to the accompanying drawings, the operation and operation of the compressor drive control device of the refrigerator according to the present invention configured as described above and the compressor drive control method of the refrigerator of the present invention implemented through the drive control device will be described.

For example, when a commercial power source (AC 220 volts) is applied to a refrigerator, the commercial power source is voltage-converted by the transformer 2, and the voltage scaled by the transformer 2 is converted into a plurality of diodes (not shown). It is converted into direct current by the rectifying section 4 of the bridge circuit. Here, the DC voltage output from the rectifier 4 is proportional to the magnitude of the commercial input power supply voltage.

The DC voltage output from the rectifier 4 is input to the duty controller 8 and the power supply voltage detector 6 including the distribution resistors R1 and R2. When the DC voltage is input to the duty controller 8, the duty controller 8) inputs a duty pulse related to the DC voltage to the controller 10. The duty cycle control unit 8 is 50% duty if the voltage (Vin) of the input power supply is 220V or more, 30% duty if less than 220V and 200V or more, 0% duty if less than 200V To preferably output. That is, the duty controller 8 preferably outputs a duty trigger pulse corresponding to the voltage Vin of the input power source.

In addition, when the DC voltage output from the rectifier 4 is input to the power supply voltage detector 6, the power supply voltage detector 6 inputs the voltage values distributed by the distribution resistors R1 and R2 to the controller 10. The control unit 10 controls the voltage variable unit 12 so that the magnitude of the voltage applied to the compressor 12 becomes a predetermined size (for example, AC 220 volts). Here, the controller 12 preferably includes a microcomputer 11 provided with the A / D converter 11 ', wherein the divided voltage value is input to the A / D converter 11' and the controller ( 10 inputs a predetermined signal to the voltage varying unit 12 so that a voltage of a predetermined magnitude can be constantly applied to the compressor 3 regardless of a change in the power supply voltage. When the voltage variable unit 12 receives a signal from the control unit 12, the voltage variable unit 12 operates so that the voltage applied to the compressor 3 is constant to a predetermined size according to the signal of the control unit 10. The above content is described in more detail with reference to the flowchart of FIG. 3 as follows.

For example, when the input power supply voltage Vin is 220 volts or more (S2), the duty controller 8 outputs a 50% duty pulse to the controller 10 (S8), and the controller 10 controls the voltage variable unit. (12) causes the compressor 3 to be supplied with a predetermined voltage, for example 200 volts, to drive the compressor 3 until the internal temperature reaches the set temperature (S16, S18). ). The controller 10 stops driving the compressor 3 when the internal temperature reaches the set temperature (S14). When the input power supply voltage Vin is 200 volts or more and less than 220 volts (S4), the duty cycle controller 8 outputs a 30% duty pulse to the controller 10 (S10), and the controller 10 receives the voltage. The variable unit 12 causes a constant voltage of a predetermined magnitude, for example, 200 volts, to be applied to the compressor 3 to drive the compressor 3 until the internal temperature reaches the set temperature (S20). S22). The controller 10 stops driving the compressor 3 when the internal temperature reaches the set temperature (S14). In addition, when the input power supply voltage Vin is less than 200 volts (S6), the duty cycle controller 8 outputs a pulse of 0% duty to the controller 10, and the controller 10 causes the voltage varying unit 12 to cause the voltage varying unit 12 to perform a voltage change. The input power supply voltage is applied to the compressor 3 so as to drive the compressor 3 until the internal temperature reaches the set temperature (S12 and S24). The controller 10 stops driving the compressor 3 when the internal temperature reaches the set temperature (S14). As a result, the present invention is capable of stably driving the compressor at a predetermined magnitude of voltage under optimum conditions irrespective of fluctuations in the input power supply voltage.

According to the compressor driving control method and the control apparatus of the refrigerator of the present invention as described above, it is possible to solve the noise / vibration problem of the compressor according to the change in the power supply voltage, it is possible to reduce the power consumption of the refrigerator.

On the other hand, the drive control method and the control apparatus of the present invention the refrigerator as described above is not limited to the above embodiment and can be carried out by adding many modifications without departing from the spirit and scope of the present invention.

Claims (7)

In the method for driving control of the compressor of the refrigerator, A first step of recognizing the magnitude of the power supply voltage input to the refrigerator, and a step of varying the magnitude of the power supply voltage such that the voltage applied to the compressor of the refrigerator is constant according to the magnitude of the voltage recognized in the first step. And a third step of applying the voltage changed in the second step to the compressor to drive the compressor. The method of claim 1, wherein when a commercial AC power source of 220 volts is used as the input power voltage, a voltage finally applied to the compressor is about 200 volts. 3. The compressor of claim 1 or 2, wherein the second step further comprises duty control of the input power supply voltage to meet 200 volts applied to the compressor. Drive control method. In the apparatus for driving control of the compressor of the refrigerator, An input power voltage sensing means for sensing a magnitude of an input power voltage and a duty connected to the input power voltage sensing means in common and outputting a duty adjustment pulse for providing a constant voltage to the compressor according to the magnitude of the input power voltage A voltage varying means for varying a voltage so that a voltage applied to the compressor is a voltage of a predetermined magnitude; and connected to the voltage varying means, the power supply voltage sensing means, and the duty adjusting means, respectively; And a control means for receiving the respective output signals of the duty adjustment means and controlling the voltage varying means to drive the voltage applied to the compressor to a voltage having a predetermined magnitude. 5. The compressor driving control apparatus for a refrigerator according to claim 4, wherein the input power voltage sensing means includes a predetermined distribution resistor. 5. The compressor driving control apparatus according to claim 4, further comprising a transformer for converting the magnitude of the input power supply voltage and a rectifier for rectifying the voltage output from the transformer to convert the voltage into a direct current. The apparatus of claim 4, wherein the control unit comprises a microcomputer having an A / D converter for converting analog information into digital information.