KR100379458B1 - Refrigerator - Google Patents

Abstract

It is a refrigerator that enables the same level of control at a lower cost than micom using a one-chip control circuit using ASIC without using expensive components such as microcomputer and transformer. Compressor, defrost heater, damper, user A key input unit having a quench key for inputting a quench command, a detector for detecting at least one in-flight condition, and outputting the comparison result by comparing the output of the detector with predetermined reference values for determining an operating condition of the refrigerator And a defrost timer and a logic circuit for integrating the operating condition setting unit and the compressor driving time and outputting the result of the integration. The operation output and the defrost timer of the output of the operating condition setting unit and the quenching signal through the key input unit are calculated through the logic circuit. Outputs control signals for controlling compressor, defrost heater and damper drive according to output Including a one-chip control circuit including a control signal generator, a clock signal generator for generating a reference clock pulse for the operation of the control signal generator, and a regulator for converting commercial AC power into a DC power of a predetermined level for internal circuit operation. Since it is possible to reduce the manufacturing cost of the control device and eventually reduce the price of the product, it is possible to improve the competitiveness of the product.

Description

Refrigerator {Refrigerator}

The present invention relates to a refrigerator, and more particularly, to a refrigerator in which a control-related configuration of the refrigerator is designed in the form of a one-chip using an application specification integrated circuit (ASIC).

Generally, a refrigerator is a device that is used for long-term storage of fresh food, and mainly includes a main body, a freezer compartment for freezing food, a refrigerator compartment for cold storage of food, a compressor, a condenser, an evaporator, a capillary tube, and the like. And a refrigeration cycle associated configuration for cooling the freezer compartment and the refrigerating compartment.

In addition, a damper (Damper) is provided as a configuration for adjusting the amount of cold air flowing into the refrigerating chamber and the freezing chamber.

Hereinafter, a refrigerator according to the prior art will be described with reference to the accompanying drawings.

1 is a view schematically showing a refrigerator according to the prior art.

As shown in FIG. 1, the refrigerator according to the related art includes a power rectifier 10 for full-wave rectification by dropping the compressor 80, the defrost heater 90, and a commercial AC power source to a low voltage, and the power rectifier ( A constant voltage unit 20 for converting the full-wave rectified power into a DC voltage of a predetermined level, a reset unit 30 for outputting a reset signal when the output voltage of the constant voltage unit 20 is below a predetermined level, and A sensing unit 50 for sensing a state and an output of the constant voltage unit 20 as a driving voltage and a control signal for driving a corresponding load according to a high internal state input through the sensing unit 50. The microcomputer 40, a clock signal generator 60 providing a reference clock pulse for the operation of the microcomputer 40, and the compressor 80 and the defrost heater according to a control signal of the microcomputer 40. It consists of a drive circuit 70 for controlling the drive of the 90.

The power rectifier 10 includes a low voltage transformer T for strengthening a commercial AC power source to a low voltage, and a bridge diode BD for full-wave rectifying an AC power voltage dropped through the low voltage transformer T. .

The constant voltage unit 20 converts an output voltage of the first capacitor C1 and the output voltage of the power rectifier 1 into a DC voltage of a predetermined level, and performs a buffering function of the voltage rectified by the power rectifier 10. The regulator 21 and the 2nd capacitor C2 which buffers the output voltage of the said regulator 21 are comprised.

The reset unit 30 senses the output level of the regulator 21 and generates a reset signal when the level is less than a predetermined level, and a resistor R1 connected in parallel to the voltage detector 31. And a third capacitor C3.

The clock signal generator 60 includes a crystal oscillator (X-tal), fourth and fifth capacitors (C4) and C5 connected to both ends of the crystal oscillator (X-tal), and the crystal oscillator (X). -tal) and a second resistor R2 connected in parallel.

Referring to the operation of the refrigerator according to the prior art configured as described above are as follows.

First, when commercial AC power is applied through the power rectifying unit 10, the voltage drops through the low voltage transformer T1, and the voltage dropped power is full-wave rectified while passing through the bridge diode BD.

The converted DC power is converted into a constant voltage of a predetermined level through the regulator 21 of the constant voltage unit 20 is applied to the driving voltage of the microcomputer 40.

Meanwhile, the reset unit 30 detects whether the voltage level applied as the driving voltage of the microcomputer 40 is lower than or equal to a predetermined level, and resets the reset signal for initializing the microcomputer 40 when the driving voltage is lower than or equal to the predetermined level. Output

Subsequently, the microcomputer 40 receives an evaporator (not shown) and a freezing chamber internal temperature detection signal through the sensing unit 50 and drives a control signal for driving the compressor 80 and the defrost heater 90 accordingly. Output to the furnace 70.

At this time, when the operation time of the compressor accumulated in the timer (not shown) elapses for a predetermined time or more, the microcomputer 40 stops the driving of the compressor 80 through the driving circuit 70 and evaporator in accordance with the freezing cycle. The defrosting heater 90 is driven to remove the frost formed on the surface and deteriorating the freezing performance.

Subsequently, the microcomputer 40 senses the temperature of the evaporator through the sensing unit 50 and stops the driving of the defrost heater 90 when the temperature reaches a predetermined temperature to end the defrosting operation.

The refrigerator according to the related art uses expensive components such as a transformer for power supply, a microcomputer for control, a crystal oscillator for oscillation, and thus, a manufacturing cost increases.

Accordingly, the present invention has been made to solve the above-described problems, and the same level of control can be performed at a lower cost as compared to the microcomputer by using a one-chip control circuit using an ASIC without using expensive components such as a microcomputer and a transformer. Its purpose is to provide a refrigerator so that it can.

1 is a view showing the configuration of a refrigerator according to the prior art

2 is a view showing the configuration of a refrigerator according to the present invention

3 is a diagram illustrating a detailed configuration of a control signal generator of FIG. 2;

Explanation of symbols for main parts of the drawings

200: detection unit 201: defrost sensor

202: refrigeration sensor 203: slide volume

300: one-chip control circuit 301: operating condition setting unit

302: control signal generator 303: clock signal generator

304: regulator 305: abnormality determination unit

306: protection circuit 400: first drive circuit

500: second drive circuit (second triac) 600: compressor

700: defrost heater 810: defrost timer

820: first logic circuit portion 830: power failure timer

840: second logic circuit portion 900: key input portion

1000: damper

The present invention provides a compressor, a defrost heater, a damper, a key input unit having a quench key for a user to input a quench command, a detector for detecting at least one in-flight condition, and an output of the detector for determining an operating condition of the refrigerator. An operation condition setting unit for comparing the predetermined reference values and outputting the comparison result, and a defrost timer and logic circuit for accumulating the compressor driving time and outputting the corresponding integration result, and outputting the quenching signal through the output of the operating condition setting unit and the key input unit. The control signal generator outputs a control signal for controlling the driving of the compressor, the defrost heater, and the damper according to the operation output calculated through the logic circuit and the output of the defrost timer, and generates a reference clock pulse for the operation of the control signal generator. Regulator converts the clock signal generator and commercial AC power into DC power of predetermined level for internal circuit operation It characterized by configured to include a one-chip control circuit with a built-in emitter.

The present invention provides a compressor, a defrost heater, a damper, a first drive circuit for driving the compressor, a second drive circuit for driving the defrost heater, a key input unit having a quench key for the user to input a quench command, at least one A detector for detecting an in-flight condition, an output of the detector by comparing an output of the detector with predetermined reference values for determining an operation condition of the refrigerator, and a result of the integration operation by integrating an operation condition setting unit for outputting the comparison result and a compressor driving time A control signal having a defrost timer and a logic circuit and controlling the operation of the compressor, the defrost heater and the damper according to the operation output calculated through the logic circuit and the output of the operation condition setting unit and the quenching signal through the key input unit. A clock signal generator for generating a reference clock pulse for the operation of the control signal generator and a control signal generator; The control signal generator outputs a control signal according to a regulator for converting the AC power supply to a DC power supply having a predetermined level for internal circuit operation, and an abnormality determining unit for determining an abnormality in the output voltage and internal temperature of the regulator. Another feature is that it comprises a one-chip control circuit with a built-in protection circuit to be output or cut off to the first drive circuit or the second drive circuit.

Hereinafter, with reference to the accompanying drawings illustrating a preferred embodiment of the refrigerator according to the present invention.

2 is a view showing the configuration of a refrigerator according to the present invention, Figure 3 is a view showing the detailed configuration of the control signal generator of FIG.

As shown in Figure 2, the refrigerator according to the present invention is a compressor for converting the diode (D1) and capacitor (C1), low-temperature / low-pressure gas refrigerant for the rectification and smoothing of a commercial AC power supply to a high-temperature / high-pressure gas refrigerant 600, a defrost heater 700 to remove the defrost on the surface of the evaporator (not shown), a damper 1000 for adjusting the amount of cold air flowing into the refrigerating chamber and the freezing chamber, a sensing unit for detecting at least one internal condition The one-chip control circuit 300 and the one-chip control circuit 300 outputting a control signal for controlling the driving of the compressor 600 and the defrost heater 700 according to the detection signal of the detection unit 200. The first drive circuit 400 for driving the compressor 600 in accordance with the control signal output from the), the second drive circuit for driving the defrost heater 700 in accordance with the control signal output from the one-chip control circuit 300 Furnace 500, the user has various copper, including quench orders It consists of a key input unit 900 for inputting a command.

At this time, the detection unit 200 is composed of a thermistor defrost sensor 201 for detecting the surface temperature of the evaporator, consisting of thermistor refrigeration sensor 202 for detecting the temperature in the freezer compartment, consisting of a variable resistor in the freezer compartment set by the user It is composed of a slide volume 203 for sensing the temperature level and each end is connected in parallel to each other and is commonly supplied with 5V operating power.

The first driving circuit 400 is connected to the compressor 600 according to the output of the first triac 401 and the first triac 401, which are turned on and off according to the output of the one chip control circuit 300. It consists of a relay 402 for supplying power.

The second driving circuit 500 includes a second triac 500 that supplies power to the defrost heater 700 according to the output of the one chip control circuit 300.

The key input unit 900 includes a quench key for inputting a quench command.

The one-chip control circuit 300 compares the output of the sensing unit 200 with predetermined reference values for determining an operation condition of the refrigerator and outputs a comparison result thereof, and the operation condition setting unit. A control signal generator for outputting a control signal for controlling the driving of the compressor 600, the defrost heater 700 and the damper 1000 in accordance with the output of the 301 and the quenching signal input through the key input unit 900 302, an internal circuit for the power rectified and smoothed through the clock signal generator 303 for generating a reference clock pulse for the operation of the control signal generator 302, the diode D1 and the capacitor C1. The regulator 304 for converting to a DC power supply of a predetermined level for operation, the abnormality determination unit 305 for determining the output voltage of the regulator 304 and the temperature abnormality in the one-chip control circuit 300, the abnormality determination The control scene according to the output of the unit 305 A control signal generation unit 302 is composed of a protection circuit portion (306) such that the first output or shut off the first and the second driving circuit 400, 500.

In this case, the operation condition setting unit 301 receives the output of the defrost sensor 201 to the inverting terminal (-) and the first comparator 301a to which the first reference voltage V _ref1 is applied to the non-inverting terminal (+). , To a third comparator 301c and a non-inverting terminal (+), to which the second reference voltage V _ref2 is applied to the inverting terminal (-) and the output of the slide volume 203 is input to the non-inverting terminal (+). The second comparator 301b receives an output of the refrigeration sensor 202 and an output of the slide volume 203 into an inverting terminal (−). The first to third resistors R1, R2, and R3 for voltage dividing ends having a common ground are connected to each of the defrost sensor 201, the freezing sensor 202, and the slide volume 203.

The abnormality determining unit 305 compares the output voltage level of the regulator 304 with a third reference voltage V _ref3 and outputs a result of the comparison. The fourth chip comparator 305a and the one-chip control circuit 300 are provided. If the temperature of more than the reference temperature of the overheat detector 305b for outputting a signal for protecting the internal circuit.

The protection circuit unit 306 logically multiplies the control signal output from the control signal generator 302 to control the compressor 600 and the output of the abnormality determination unit 305 and outputs a result of the first AND gate. 306a) to the second AND gate 306b which multiplies the output of the control signal output from the control signal generator 302 to control the defrost heater 700 and the output of the abnormality determination unit 305 and outputs the result. It is composed. In addition, the regulator 304 is provided with a second capacitor (C2) for performing the buffer role of the 5V DC power supplied to the sensing unit 200.

As shown in FIG. 3, the control signal generator 302 accumulates the operation time of the compressor 600 for the defrosting operation and outputs a predetermined signal when a predetermined time, that is, 6 hours and 40 minutes, is reached. Drive the compressor 600, the defrost heater 700, and the damper 1000 according to the output of the defrost timer 810 and the defrost setting signal / freezing setting signal and the quenching signal output from the operation condition setting unit 301. The first logic circuit unit 820 for generating a control signal for controlling, a sintering timer for limiting the operation of the defrost heater 700 for a predetermined time when the user selects the sintering mode, that is, the operation mode for minimizing the power consumption ( 830, the defrost timer 810 and the power dissipation according to the shunt signal / defrost setting signal output from the operation condition setting unit 301, the shunt timer 830, and the output of the first logic circuit unit 820. Second logic circuit for driving timer 830 The furnace 840 is configured.

In this case, the first logic circuit 820 is a third AND gate 821 and the third AND gate 821 to logically multiply the output of the defrost timer 810 and the defrost setting signal output from the operation condition setting unit 301. Control the defrost heater by inverting the output of the first SR flip-flop 822 and the first SR flip-flop 822, which receives the output of the output signal as the 'S' stage and receives the inverted defrost setting signal as the 'R' stage. Inverter 823 outputting a signal, a fourth AND gate 824, and the fourth logical AND of the output of the inverted first SR flip-flop 822 and the refrigeration setting signal output from the operation condition setting unit 301. The first or gate 825 is configured to OR the output of the AND gate 824 and the quench signal and output the result as a compressor control signal.

The second logic circuit 840 may output an output of the first NOR gate 841 and the timer 830 to the 'S' stage, which negatively ORs the shunt signal and the defrost setting signal of the operation condition setting unit 301. Output and operation of the second SR flip-flop 842 and the second SR flip-flop 842 that receive the input and inverted output of the first NOR gate 841 to the 'R' stage and output a signal accordingly. A negative timer by negatively ORing the output of the second OR gate 843 and the output of the second SR flip-flop 842 and the output of the first NOR gate 841 to the OR signal output from the condition setting unit 301. The output of the second nor gate 845 and the second or gate 843 and the output of the first or gate 825 of the first logic circuit unit 820 are output by a logical signal. The fifth end gate 844 outputs the start signal of the defrost timer 810.

Referring to the operation of the refrigerator according to the present invention configured as described above in detail.

When the commercial AC power is input, the diode D1 and the capacitor C1 rectify and smooth the same to output the pulsed power. Subsequently, the regulator 304 converts the pulse current power into a DC power of a predetermined level necessary for the operation of the internal circuit, and supplies the same to the respective parts and the sensing unit 200 of the one chip control circuit 300 to start the freezing cycle and the control operation of the refrigerator. .

First, the detection unit 200 detects the current freezer compartment internal temperature, the evaporator surface temperature, the user set temperature level and the ambient temperature and outputs the detected value, and the operating condition setting unit 301 detects the detected value of the detection unit 200. Set the operation condition according to the detailed operation as follows.

That is, the defrost sensor 201 of the sensing unit 200 detects a resistance value change according to a change in the surface temperature of the evaporator and outputs it in the form of a voltage due to the operation characteristic of the thermistor, and the voltage value is divided with the third resistor R3. The voltage is divided by the ratio and input to the inverting terminal (-) of the first comparator 301a of the operation condition setting unit 301. The refrigerating sensor 202 detects a change in resistance value according to a temperature change in the freezer compartment and outputs it in the form of a voltage, and the voltage value is divided by the voltage dividing ratio with the second resistor R2 to set the operating condition setting unit 301. 2 is input to the non-inverting terminal (+) of the comparator 301b. The slide volume 203 senses a change in resistance value according to a user's adjustment and outputs it in the form of a voltage. The inverting terminal (-) of the comparator 301b and the non-inverting terminal (+) of the third comparator 301c are input.

At this time, since the output voltage of the slide volume 203 is the reference voltage of the second comparator 301b and the input voltage of the third comparator 301c, when the user adjusts the slide volume 203 to change the freezer setting temperature level. The output of the second comparator 301b is variable in proportion to the variable degree.

Subsequently, the first comparator 301a of the operation condition setting unit 301 determines whether the sensed voltage of the divided defrost sensor 201 and the first reference voltage V _ref1 , that is, the surface temperature of the evaporator is 13 ° C. or higher. The reference voltages are compared with each other. As a result, when the evaporator surface temperature is 13 ° C. or higher, “high” is output to the control signal generator 302 as a defrost setting signal when the evaporator surface temperature is lower than 13 ° C. The second comparator 301b compares the output voltage of the divided refrigeration sensor 202 with the output voltage of the divided slide volume 203 and the current freezer compartment high temperature is greater than or equal to the set temperature set by the slide volume 203. If the 'high' is less than the set temperature, 'low' is output to the control signal generator 302 as a refrigeration setting signal. Subsequently, the third comparator 301c compares the output voltage of the divided slide volume 203 with the second reference voltage V _ref2 , so that the output voltage of the divided slide volume 203 is equal to the second reference voltage V _ref2 . If it is above, 'high' is less than the second reference voltage V _ref2 , and 'low' is outputted to the control signal generator 302 as a sour signal.

In addition, the control signal generator 302 outputs a control signal for controlling the driving of the compressor 600 and the defrost heater 700 in accordance with the operating conditions according to the output of the operation condition setting unit 301, the details of which The operation is as follows.

When the initial power is applied, since the defrost timer 810 is before operation, the controller outputs 'low', and since the defrost setting signal is 'high', the third AND gate 821 of the first logic circuit unit 820 outputs 'low'. Accordingly, the first SR flip-flop 822 outputs 'low'. In addition, when the refrigeration setting signal is 'high', the fourth end gate 824 outputs 'high'. Accordingly, the first or gate 825 logically combines the output of the fourth end gate 824 with the quenching signal, and outputs 'high' as the compressor control signal because the output of the fourth end gate 824 is 'high'. .

Therefore, when only one of the output or the quench signal of the fourth end gate 824 is 'high', the compressor 600 is driven. At this time, the quench signal is input to the first or gate 825 and a signal for controlling the damper 1000 at the same time as the control signal for driving the compressor 600, the quench signal while the quench signal maintains 'high' Simultaneously driving the 600 and at the same time maximize the opening angle of the damper (1000) to ensure that the cold air generated by the compressor (600) drive as much and quickly as possible.

If the user does not select the fusion mode by manipulating the slide volume 203, since the fusion signal is 'high', the second or gate 843 of the second logic circuit 840 outputs 'high' and Accordingly, the 'high' signal is output from the fifth end gate 844 so that the defrost timer 810 starts the compressor driving time integration operation.

Therefore, the defrost timer 810 integrates the time at which the output of the fifth AND gate 844 of the second logic circuit unit 840 is 'high', that is, the driving time of the compressor 600, and the integration time is a predetermined time. That is, when it reaches 6 hours and 40 minutes, it outputs a 'high' signal through the output terminal (OUT).

Subsequently, the third AND gate 821 of the first logic circuit unit 820 logically multiplies the 'high' signal output from the defrost timer 810 and the defrost setting signal. When the evaporator surface temperature is less than 13 ° C, the first SR flip-flop 822 outputs 'low' and finally outputs 'high' through the inverter 823 as a defrost heater control signal to remove the frost formed on the surface of the evaporator. The defrost heater 700 is driven to operate.

However, even if the compressor driving integration time reaches 6 hours 40 minutes, if the defrost setting signal is 'high', that is, if the current evaporator surface temperature is 13 ° C. or more, it is not necessary to operate the defrost heater 700. Therefore, even if 'high' is output from the defrost timer 810, if the current defrost setting signal is 'high', the first SR flip-flop 822 outputs 'high' and finally 'low' is defrosted through the inverter 823. The defrost heater 700 is not driven by outputting the heater control signal.

On the other hand, when the user selects the power consumption mode through the slide volume 203 and the power consumption signal is 'low' and the current defrost setting signal is 'high', the first NOR gate 841 outputs 'low', Since the 2 SR flip-flop 842 outputs 'low' according to the initial output 'low' of the sorption timer 830, the output of the second NOR gate 845 becomes 'high'. Subsequently, when the scavenger timer 830 reaches the predetermined time, that is, 72 hours, the integration timer 830 outputs high. As such, since the second SR flip-flop 842 continuously outputs 'low' for 72 hours, the fifth AND gate 844 also outputs 'low' to stop the integration operation of the defrost timer 810. That is, when the integration time of the defrost timer 810 reaches 6 hours 40 minutes, the defrost heater 700 is driven according to the defrost setting signal, and the integration operation of the defrost timer 810 is stopped to stop the integration operation of the defrost heater 700. Shut off the drive to perform the solstice mode.

On the other hand, after 72 hours, when the sorption timer 830 outputs a 'high' signal, the surface temperature of the evaporator is lowered because the compressor 600 is driven while the defrost heater 700 is not operated for 72 hours. Is low, the first NOR gate 841 of the second logic circuit unit 840 outputs high, the second SR flip-flop 842 outputs high, and the second or gate 843. Outputs 'high'.

The third AND gate 821 of the first logic circuit unit 820 receives the defrost setting signal 'low' and outputs 'low', and the first SR flip-flop 822 also outputs 'low', and freezing When the set signal is 'high', since the fourth end gate 824 outputs 'high', the first or gate 825 also outputs 'high'. Accordingly, since the fifth AND gate 844 of the second logic circuit 840 outputs 'high', the defrost timer 810 starts to accumulate the compressor driving time.

Meanwhile, the detailed operation of driving the compressor 600 and the defrost heater 700 according to the control signal for controlling the driving of the compressor 600 or the defrost heater 700 in the control signal generator 302 is as follows. same.

As described above, when the control signal generator 302 outputs the control signal to the protection circuit unit 306, the fourth comparator 305a determines that the output voltage of the regulator 304 and the third reference in the abnormality determination unit 305. comparing a voltage (V _ref3) to the output voltage of the regulator 304, and outputs it to the third reference voltage (V _ref3) "low" driving signal generating unit 306 a signal for preventing the malfunction of the circuit is less than. The overheat detection unit 305b outputs a low signal to the protection circuit unit 306 when the temperature of the one-chip control circuit 300 is higher than the reference temperature in order to prevent circuit damage or malfunction due to overheating.

Therefore, the first and second end gates 306a and 306b of the protection circuit unit 306 determine abnormality according to their operation characteristics, that is, the output characteristics become low when any one of the inputs is 'low'. When the outputs of the unit 305 are all high, the control signal generator 302 outputs the control signal of the compressor 600 and the defrost heater 700 to the first driving circuit 400 and the second driving circuit, respectively. Output to the furnace 500.

Subsequently, when the output of the first AND gate 306a of the protection circuit unit 306 is 'high', the first driving circuit 400 conducts the first triac 401 so that the excitation coil of the relay 402 is excited. Therefore, the power is supplied to the compressor 600 in contact with the power stage, and thus the compressor 600 is driven and the refrigeration cycle proceeds. When the output of the second AND gate 306b of the protection circuit unit 306 is 'high', the second driving circuit 500 conducts the second triac and supplies power to the defrost heater 700. The 700 generates heat and performs defrosting on the surface of the evaporator.

On the other hand, when either the fourth comparator 305a or the overheat detection unit 305b of the abnormality determination unit 305 outputs a 'low' signal, that is, an abnormality occurs in the output voltage of the regulator 304 or the one-chip control circuit. When the internal temperature is overheated above the reference temperature and detects a 'low' signal, the output of the protection circuit unit 306 becomes 'low' regardless of the control signal of the control signal generator 302. Operation of the 600 and the defrost heater 700 is blocked.

The refrigerator according to the present invention is designed to efficiently control various loads such as compressors and defrost heaters by a one-chip type control circuit using an ASIC with a rectifier element and an oscillation element without using expensive microcomputers, transformers, crystal oscillators, etc. Since the manufacturing cost of the control device can be reduced, and thus, the price of the product can be reduced, the competitiveness of the product can be improved.

Claims (9)

compressor; Defrost heaters; Damper; A first driving circuit for driving the compressor; A second driving circuit for driving the defrost heater; A key input unit having a quench key for the user to input a quench command; A detector for detecting at least one in-fault condition; And, An operation condition setting unit for comparing the output of the detection unit with predetermined reference values for determining an operation condition of the refrigerator, and outputting a comparison result; a defrost timer and a logic circuit for accumulating the compressor driving time and outputting the integration result; Outputting a control signal for controlling the operation of the compressor, the defrost heater and the damper according to the operation output of the operation condition setting unit and the quenching signal through the key input unit through the logic circuit and the output of the defrost timer. A control signal generator, a clock signal generator for generating a reference clock pulse for the operation of the control signal generator, a regulator for converting commercial AC power into a DC power of a predetermined level for internal circuit operation, an output voltage of the regulator and the An abnormality determining unit for determining an abnormality in the internal temperature of the one-chip control circuit; According to the determination output of the refrigerator, characterized by configured by comprising a one-chip control circuit built-in protection circuit to ensure that the control signal of said control signal generating the second or output to the drive circuit 1 or to the second drive circuit block. According to claim 1, The sensing unit A refrigeration sensor for detecting a temperature in the freezer compartment, Defrost sensor for sensing the surface temperature of the evaporator, And a slide volume whose output voltage is varied according to a high temperature level within the user. According to claim 1, The control signal generator Defrost timer for outputting a predetermined signal by integrating the operating time of the compressor for the defrost operation, A first logic circuit unit for generating a compressor, a defrost heater, and a damper control signal according to a defrost setting signal / freezing setting signal and a quenching signal output from the defrost timer and the operation condition setting unit; Cast timer, And a second logic circuit unit for driving the defrost timer and the sour timer in accordance with the shunt signal / defrost setting signal output from the operation condition setting unit, the shunt timer output, and the output of the first logic circuit section. Refrigerator The method of claim 1, The one chip control circuit And an abnormality determining unit for determining an abnormality in an output voltage of the regulator and an internal temperature of the one-chip control circuit. The method of claim 4, wherein The abnormality determination unit A comparator for determining an abnormality of the regulator output voltage; And an overheat detector for determining an abnormal temperature inside the one-chip control circuit. delete According to claim 1, The first driving circuit A first triac determining whether conduction is determined according to an output of the protection circuit; And a relay for supplying power to the compressor according to the conduction of the first triac. According to claim 1, The second driving circuit And a second triac for supplying power to the defrost heater in accordance with the output of the protection circuit unit. According to claim 1, The protection circuit part A first AND gate which logically multiplies the outputs of the abnormality determining unit and the control signal generating unit and outputs the result to the first driving circuit; And a second end gate multiplied by an output of the abnormality determining unit and the control signal generating unit and output to the second driving circuit.