KR100364777B1 - A Refrigerator - Google Patents

Abstract

The refrigerator relates to a control-related configuration of the refrigerator in the form of a one-chip using an application specification integrated circuit (ASIC), comprising: a compressor, a defrost heater, a sensing unit for sensing at least one in-fault condition, A display driver for outputting a signal so that an operation state according to the internal temperature sensed by the sensor is displayed on the display unit, and an operation condition setting unit for comparing the output of the sensor with predetermined reference values and outputting a comparison result And a control signal generator which controls driving of the compressor or defrost heater according to the output of the operation condition setting unit, detects an abnormal operation of the compressor or defrost heater, and outputs a control signal to generate a warning sound accordingly. A regulator for converting a commercial AC power source into a DC power source having a predetermined level for internal circuit operation; A one-chip control circuit having a built-in abnormality discrimination unit for discriminating an output voltage of the radar and a temperature abnormality inside the one-chip control circuit, a first driving circuit for driving the compressor according to the output of the one-chip control circuit, and the one-chip control circuit. And a second driving circuit for driving the defroster according to the output of the compressor, and a warning sound generator for generating a warning sound during abnormal operation of the compressor or the defrost heater. When abnormal operation of the heater can be recognized by the user by generating a warning sound has the effect of minimizing the power consumption and at the same time improve the energy efficiency.

Description

Refrigerator {A 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).

In general, a refrigerator is a device used for long-term storage of fresh food, and includes a main body, a freezer compartment for freezing food, a refrigerator compartment for storing food, and a freezing cycle for cooling the freezer compartment and refrigerator compartment. It is composed.

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 compressor 8, a defrost heater 9, a power rectifier 1 for full-wave rectification by dropping a commercial AC power source AC to a low voltage, and the power source. A constant voltage unit 2 for converting the electric power rectified by the rectifier 1 into a DC voltage of a predetermined level, and a reset unit 3 for outputting a reset signal when the output voltage of the constant voltage unit 2 is lower than or equal to a predetermined level; And a sensing unit 5 for detecting at least one fault state and a load corresponding to the output of the constant voltage unit 2 as a driving voltage and at least one fault state input through the detector 5. The microcomputer 4 for outputting a control signal for driving the microcontroller, a clock signal generator 6 for providing a reference clock pulse for the operation of the microcomputer 4, and the microcomputer 4 according to the control signal of the microcomputer 4; A driving circuit for controlling driving of the compressor 8 and the defrost heater 9 7) and a warning sound generating unit 10 for displaying the outside when the compressor 8 or the defrost heater 9 is driven abnormally according to the control signal of the microcomputer 4. Here, the reference numerals are the first to third capacitors C1, C2, C3, and resistor R1.

The power rectifier 1 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 rectification of an AC power voltage dropped through the low voltage transformer T. .

The constant voltage unit 2 includes a first capacitor C1 for buffering the full-wave rectified voltage in the power rectifier 1 and a regulator 21 for converting the output voltage of the power rectifier 1 into a DC voltage having a predetermined level. ) And a second capacitor C2 buffering the output voltage of the regulator 21.

The reset unit 3 senses the output level of the regulator 21 and generates a reset signal when the level is below a predetermined level, and a resistor R1 connected in parallel to the voltage detector 31. And a third capacitor C3.

The clock signal generator 6 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 1, the voltage is dropped through the low voltage transformer T1, and the voltage drop 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 2 and applied to the driving voltage of the microcomputer 4.

On the other hand, the reset unit 3 detects whether the voltage level applied as the driving voltage of the microcomputer 4 is below a predetermined level, and resets the reset signal for initializing the microcomputer 4 when the driving voltage is below the predetermined level. Output

Subsequently, the microcomputer 4 receives the evaporator (not shown) and the freezing chamber internal temperature detection signal through the detection unit 5 to drive the compressor 9 and the defrost heater 10. The control signal is output in synchronization with the reference pulse input from 7).

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 4 outputs the driving stop signal of the compressor 9 and supplies a signal to drive the defrost heater 10. Output

That is, when the integration time of the timer (not shown) elapses for a predetermined time, the driving of the compressor 9 is stopped, and the defrost heater 10 is heated to melt ice.

Therefore, when the defrost heater 10 is heated and the temperature of the evaporator (not shown) reaches a predetermined temperature after the defrost is finished, the detection unit 5 detects this and outputs a signal to the microcomputer 4, and the microcomputer (4) terminates the defrosting operation when the temperature of the evaporator (not shown) rises above the set temperature.

At this time, when the operation rate of the compressor 8 is abnormal or when the operation time of the defrost heater 9 passes more than a predetermined time, the microcomputer 4 detects this and generates a warning sound in the warning sound generating unit 10. Control as possible.

As described above, the refrigerator according to the prior art has the following problems.

First, manufacturing cost is high because expensive components such as transformer for power supply, microcomputer for control, and crystal oscillator for oscillation are used.

Second, when displaying the internal temperature state selected by the user under the control of the microcomputer, high power is required at a predetermined level or higher, thereby reducing energy efficiency.

The present invention has been made to solve this problem, by designing a one-chip control circuit using ASIC without using expensive components such as microcomputers and transformers so that the user can recognize the alarm sound when abnormal operation of the compressor or defrost heater It is an object of the present invention to provide a refrigerator to be produced.

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

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

3 is a view illustrating in detail the control signal generator shown in FIG.

4 is a view illustrating in detail the duty ratio detector shown in FIG.

Explanation of symbols for main parts of the drawings

100: power input unit 200: detection unit

201: defrost sensor 202: refrigeration sensor

203: Slide volume 300: One chip control circuit

301: operating condition setting unit 301a: first comparator

301b: second comparator 303c: third comparator

302: control signal generator 303: clock signal generator

304: regulator 305: abnormality determination unit

305a: fourth comparator 305b: overheat detection unit

306: protection circuit section 306a: fourth and gate

306b: fifth and gate 307: reset unit

310: defrost timer 320: fire hydrant timer

330: control logic 331: first and gate

332: first SR flip-flop 333: second and gate

334: first NOR gate 335: second SR flip-flop

336: second nor gate 337: the first or gate

338: third and gate 340: abnormal operation determination unit

341: duty ratio detector 342: fifth comparator

343: timer 344: second or gate

345: Transition point detector 346: Third or gate

347: counter 348: first transmission gate

349: second transmission gate 350: first register

351: second register 352: multiplier

353: divider 400: first driving circuit

401: first triac 402: relay

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

700: defrost heater 800: warning sound generating unit

The refrigerator according to the present invention for achieving the above object includes a compressor, a defrost heater, a sensing unit for sensing at least one in-fault condition, and an operating state according to the in-flight temperature detected by the detecting unit. A display driver for outputting a signal to be displayed, an operating condition setting unit for comparing the output of the sensing unit with predetermined reference values, and outputting a comparison result; and driving the compressor or the defrost heater according to the output of the operating condition setting unit. And a control signal generator for detecting an abnormal operation of the compressor or the defrost heater and outputting a control signal to generate a warning sound according to the above, and converting commercial AC power into DC power of a predetermined level for internal circuit operation. Determining a regulator, an output voltage of the regulator, and an abnormal temperature inside the one-chip control circuit A one-chip control circuit having a built-in abnormality discrimination unit, a first drive circuit for driving the compressor according to the output of the one-chip control circuit, a second drive circuit for driving the defrost heater according to the output of the one-chip control circuit, and And, according to the output of the one-chip control circuit is configured to include a warning sound generating unit for generating a warning sound during abnormal operation of the compressor or defrost heater.

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

2 is a view showing a refrigerator according to the present invention, FIG. 3 is a view showing in detail a control signal generator shown in FIG. 2, and FIG. 4 is a view showing in detail a duty ratio detector shown in FIG.

As shown in FIG. 2, the refrigerator according to the present invention includes a power input unit 100 for supplying commercial AC power, and a diode D1 for rectifying and smoothing the commercial AC power input through the power input unit 100. And a capacitor (C1), a compressor (600) for converting a low-temperature / low-pressure gas refrigerant into a high-temperature / high-pressure gas refrigerant, a defrost heater (700) for removing defrost on an evaporator (not shown), and at least one The sensing unit 200 for detecting the internal temperature of the high temperature and the desired internal temperature of the user, and for controlling the driving of the compressor 600 and the defrost heater 700 according to the detection signal of the detection unit 200. One chip control circuit 300 for outputting a control signal, a first drive circuit 400 for driving the compressor 600 according to the control signal output from the one chip control circuit 300, and the one chip control circuit 300 The defrost heater 700 according to the control signal output from Warning sound generator 800 for generating a warning sound to express the abnormal operation of the compressor 600 or the defrost heater 700 in accordance with the output of the second driving circuit 500 and the one-chip control circuit 300 to drive And first to third fuses 101 and 102 and 103 for preventing overcurrent.

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 thermistors consisting of a refrigeration sensor 202 for detecting the temperature in the freezer compartment, variable resistance is set by the user It is composed of a slide volume 203 for detecting a temperature level in a freezer compartment and each end is connected in parallel to each other and is commonly supplied with 5V operating power.

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 setting the operation condition. The control signal to control the driving of the compressor 600 or the defrost heater 700 according to the output of the unit 301, detect the abnormal operation of the compressor 600 or the defrost heater 700 and generate a warning sound accordingly. A control signal generator 302 for outputting a signal, a clock signal generator 303 for generating a reference clock pulse for the operation of the control signal generator 302, and the diode D1 and the capacitor C1. Regulator 304 for converting the rectified and smoothed power supply to a DC power supply of a predetermined level for internal circuit operation, and for determining the output voltage of the regulator 304 and the temperature abnormality inside the one-chip control circuit 300 The abnormality determining unit 305, A protection circuit unit 306 for outputting or blocking the control signals of the control signal generator 302 to the first and second driving circuits 400 and 500 according to the output of the abnormality determining unit 305, When the output voltage of the regulator 304 is less than or equal to the reference voltage, the reset unit 307 for outputting a reset signal to the control signal generator 302 and the operation state according to the internal temperature selected by the sensing unit 200 may be determined. And a display driver 308 for outputting a driving signal to be displayed on the display unit 800.

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 (+). The third comparator 301c is applied with the second reference voltage V _ref2 to the inverting terminal (-) and the output of the slide volume 203 is input to the non-inverting terminal (+), and the non-inverting terminal (+). The output of the refrigeration sensor 202 is input to the second comparator (301b) is input to the output of the slide volume 203 to the inverting terminal (-). The first to third resistors R1, R2, and R3 for voltage dividing ends having a common ground are connected to the defrost sensor 201, the freezing sensor 202, and the slide volume 203, respectively.

The control signal generator 302 is a logic designed to operate the compressor 600 and the defrost heater 700 according to the operation state table for each input condition by using the output of the operation condition setting unit 301 as an input condition. It is configured with (Logic).

In more detail, as shown in FIG. 3, the control signal generator 302 is output from the defrost timer 310 and the third comparator 301c for accumulating the driving time of the compressor 600. The drive of the defrost timer 310 or the burnout timer 320 is controlled according to the burnout timer 320 for accumulating the burnout time by receiving the burnout signal and the output signal of the operation condition setting unit 301. The abnormality of the control logic 330 for controlling the operation of the compressor 600 and the defrost heater 800 and the abnormal operation of the compressor 600 or the defrost heater 800 is determined and outputted to the warning sound generator 800. The operation determination unit 340 is configured.

The control logic 330 of the first AND gate 331 and the first AND gate 331 of the logical AND of the output of the defrost timer 310 and the defrost signal output from the first comparator 301a The first SR flip-flop 332 and the output and the freezing signal of the first SR flip-flop 332 for receiving the output to the S stage, the inverted signal of the defrosting signal to the R stage, The second AND gate 333, the first NOR gate 334 that receives the defrost signal and the sour signal, and performs an NOR and the output of the first NOR gate 334 are inverted to be input to the 'R' terminal. And negatively OR the output of the second SR flip-flop 335 and the output of the first NOR gate 334 and the second SR flip-flop 335 to receive the output of the power failure timer 320 at an 'S' end. A first OR gay for ORing the second NOR gate 336, the output of the second SR flip-flop 335, and the sour signal 337 and the third AND gate 338 which logically multiplies the output of the first or gate 337 and the output of the second AND gate 333 as a start signal of the defrost timer 310. It is composed.

The abnormal operation determination unit 340 compares the duty ratio detector 341 for detecting the on / off duty ratio of the compressor with the duty ratio detected by the duty ratio detector 341 and a preset reference duty ratio. A fifth comparator 342 for outputting the comparison result, a timer 343 for integrating a driving time of the defrost heater 700, an output of the comparator and an output of the timer, and the alarm sound generating unit ( And a second orifice 344 which outputs to 800.

At this time, the duty ratio detector 341 is a transition point detector 345 for detecting the rising or falling transition point of the compressor driving pulse, and the transition point detection unit 345 detected The third NOR gate 346 and the output of the third NOR gate 346 are input as a start signal to negatively sum the outputs according to the rising or falling transition points. A counter 347 for counting, a first transmission gate 348 which is turned on when the falling point detection unit 345 detects the falling transition point, and a second that is turned on when the rising point detection unit 345 detects the rising transition point In accordance with the output of the transmission gate 349, the first resistor 350 and the output of the second transmission gate 349 to accumulate the on time of the compressor drive pulse in accordance with the output of the first transmission gate (349) Pressure The second register 351 for integrating the off time of the pre-drive pulse, a multiplier 352 for multiplying the output A of the first register by a predetermined multiple (× 100), and the output of the multiplier 352 And a divider 353 for dividing (A / B) the output B of the second register.

The abnormality determining unit 305 compares an output voltage level of the regulator 304 with a reference voltage level and outputs a comparison result, and a temperature inside the one-chip control circuit 300 is a reference value. It is composed of an overheat detector 305b for outputting a signal for protecting the internal circuit if the temperature is higher than the temperature.

The protection circuit unit 306 performs a fourth AND gate for performing an AND operation on the control signal output from the control signal generator 302 to control the compressor 600 and the output of the abnormality determination unit 305 to output the result. 306a) to the fifth end gate 306b that 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.

The first driving circuit 400 is turned on / off according to the output of the fourth end gate 306a and the compressor 600 according to the output of the first triac 401. 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 fifth and gate 306b.

In addition, the regulator 304 is provided with a second capacitor (C2) for performing a buffer role of the 5V DC power supplied to the sensing unit 200.

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 pulse current 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 outputs the detected value, and the operation condition setting unit 301 operates according to the detected value of the detection unit 200. Set the condition. The detailed operation is 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 an evaporator (not shown) and outputs it in the form of a voltage due to the operation characteristic of the thermistor. The voltage is divided by the voltage dividing ratio with and) 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 the temperature change in the freezer compartment and outputs it in the form of a voltage. 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 voltage value is divided by the voltage dividing ratio with the third resistor R3 so that the second value of the operating condition setting unit 301 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 detected 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.

In addition, the second comparator 301b compares the output voltage of the divided refrigeration sensor 202 with the output voltage of the divided slide volume 203 so that the current freezing chamber inside 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.

That is, when the initial power is applied, a compressor control signal, ie, a 'high' signal, for driving the compressor 600 is output from the second AND gate 333.

The third AND gate 338 performs an AND operation on the compressor control signal and the output signal of the first OR gate 337, and outputs the start signal of the defrost timer 310.

Therefore, the defrost timer 310 accumulates the time at which the output of the third end gate 338 is 'high', that is, the driving time of the compressor 600, and the integration time reaches a predetermined time (6 hours 40 minutes). Outputs the 'high' signal through the corresponding output stage.

Subsequently, the first AND gate 331 respectively multiplies the output of the defrost timer 310 and the defrost set time, and outputs 'low' when the current evaporator surface temperature is less than 13 ° C. and the surface temperature is 13 ° C. or more. In this case, since a high signal is output, when the output of any one of the defrost timer 310 or the defrost setting time is high, the high signal is output.

In addition, the first SR flip-flop 332 receives the output of the first AND gate 331 at the 'S' stage, and receives the inverted signal of the defrost setting time at the 'R' stage. When the 'low' signal is applied to the stage and the 'high' signal is applied to the 'R' stage, the input of the 'S' stage is maintained and outputted. When the 'low' signal is applied to the 'end' outputs a 'high' signal and outputs the drive control signal of the defrost heater (700).

In addition, the output of the first SR flip-flop 332 and the refrigeration signal that is variable according to the high internal temperature is received and outputs the drive control signal of the compressor 600.

In addition, the first NOR gate 334 receives a signal obtained by inverting a negative set-up signal with a predetermined signal and inverts the signal to the 'R' end of the second SR flip-flop 335, and outputs the shunt timer 32. Is inputted into the 'S' terminal and the result of the calculation is logically multiplied by the sour signal at the first or gate 337 and input to the third AND gate 338.

At this time, the scavenger timer 320 receives a result of the negative OR of the output of the scavenger signal and the second SR flip-flop 335 as a start signal, and when a predetermined time (72 hours) elapses after the scavenger timer 320 is driven, Output high signal.

That is, when the scavenger timer 320 is driven for a predetermined time, the defrost timer 310 may be driven, and the driving of the scavenger timer 320 is stopped.

Meanwhile, in order to determine whether the compressor 600 or the defrost heater 700 is normally driven, the abnormal operation determination unit 340 turns on / off the duty ratio detector 341 when the compressor 600 is driven. After detecting the duty ratio, the fifth comparator 342 compares the reference value with a preset reference value and compares the result with the output value of the timer 343 according to the operation time of the defrost heater 700. It is decided whether or not to generate a warning sound.

The operation of the duty ratio detector 341 will now be described.

When the power is applied and the compressor driving signal is output, the rising or falling transition point of the compressor driving pulse is detected by the transition point detecting unit 345.

In this case, when one of the rising transition point and the falling transition point of the compressor driving pulse is detected, a 'low' signal is output from the third NOR gate 346, and if neither the rising transition point nor the falling transition point is detected, the first transition point is generated. A 'high' signal is output from the three NOR gate 342.

When a 'high' signal is output from the third NOR gate 346, the compressor driving time is integrated in the counter 347, and the first transmission gate 344 is detected when the falling point detection unit 341 detects the falling transition point. Is conducted so that the 'on' time is integrated in the first register 345. On the other hand, when the transition point detection unit 342 detects the rising transition point, the second transmission gate 345 is turned on, and an 'off' time is accumulated in the second register 346.

Subsequently, the 'on' time accumulated in the first register 345 is input to the multiplier 347 to be multiplied by a predetermined multiple 100, and the multiplied operation value is input to the divider 348 to receive the second fp. It is divided by the 'off' time accumulated in the jitter 346.

The output of the divider 348 calculated as described above is input to the fifth comparator 342 to determine whether the compressor 600 is normally driven through comparison with a preset reference value. That is, when the output of the divider 348 is greater than or equal to the reference value, it is determined to be abnormally operated and the 'high' signal is output from the fifth comparator 342.

Meanwhile, the timer 343 detects an operation time of the defrost heater 700. When the defrost heater 700 outputs a driving signal, the timer 343 is applied as a start signal to drive the timer 343 for a set time. After the set time has elapsed, the timer 343 outputs a 'high' signal. At this time, the setting time is about 20 minutes.

Then, the second or gate 344 receives the output of the fifth comparator 342 and the output of the timer 343 and performs a logical sum, wherein the fifth comparator 342 or the timer 343 is performed. If any one of the output of 'high' outputs a 'high' signal, and if the output of the fifth comparator 342 or the timer 343 is all 'low' outputs a 'low' signal.

Accordingly, the warning sound generator 800 determines whether the warning sound is generated according to whether the output of the second or gate 344 is 'high' or 'low'.

Subsequently, in the abnormality determining unit 305, the fourth comparator 305a compares the output voltage of the regulator 304 with the third reference voltage V _ref3 , so that the output voltage of the regulator 304 becomes the third reference voltage V _ref1. Less than), a 'low' signal is output to the protection circuit unit 306 to prevent a malfunction of the circuit.

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 fourth and fifth end gates 306a and 306b of the protection circuit unit 306 determine abnormality according to their operating 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, the first driving circuit 400 and the second driving circuit 500, which receive the control signal of the control signal generator 302 through the protection circuit unit 306, respectively, according to the control signal, respectively, the compressor 600 and the defrost heater. Driving 700, the detailed operation is as follows.

That is, 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 turned on. Since it is excited, it is contacted with the power supply stage, and power is supplied to the compressor 600. Accordingly, the compressor 600 is driven and the refrigeration cycle is performed.

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 any one of 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 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.

As described above, the refrigerator according to the present invention has the following effects.

First, by using the one-chip type control circuit using the ASIC with rectifier and oscillation element without using expensive microcomputer, transformer and crystal oscillator, it detects this in case of abnormal operation of compressor or defrost heater and generates warning sound. Power consumption can be minimized.

Second, since various loads such as a compressor and a defrost heater are efficiently controlled through a one-chip control circuit, the manufacturing cost of the control device can be reduced.

Third, since the manufacturing cost can be reduced, the price of the entire product can be reduced and the competitiveness of the product can be improved.

Claims (4)

compressor; Defrost heater; A detector for detecting at least one in-fault condition; A display driver for outputting a signal so that an operation state according to the internal temperature sensed by the sensor is displayed on the display unit, and an operation condition setting unit for comparing the output of the sensor with predetermined reference values and outputting a comparison result And a control signal generator which controls driving of the compressor or defrost heater according to the output of the operation condition setting unit, detects an abnormal operation of the compressor or defrost heater, and outputs a control signal to generate a warning sound accordingly. A one-chip control circuit incorporating a regulator for converting commercial AC power into a DC power supply having a predetermined level for internal circuit operation, and an abnormality discriminating unit for discriminating an output voltage of the regulator and an abnormal temperature inside the one-chip control circuit; A first driving circuit driving the compressor according to a control signal output from the one chip control circuit; A second driving circuit for driving the defrost heater in accordance with a control signal output from the one chip control circuit; And, And a warning sound generating unit for generating a warning sound during abnormal operation of the compressor or the defrost heater according to the output of the one-chip control circuit. The method of claim 1, wherein the control signal generator A defrost timer for integrating a driving time of the compressor; A digestion timer for integrating a digestion time when the sensing unit detects the digestion mode; A control logic for outputting a control signal for controlling the driving of the compressor or the defrost heater according to the output of the operation condition setting unit; And, And an abnormal operation determination unit for detecting an abnormal operation of the compressor or the defrost heater and outputting a signal to the warning sound generating unit to generate a warning sound. The method of claim 2, wherein the abnormal operation determination unit A duty ratio detector for detecting an on / off duty ratio of the compressor; A comparator for comparing the duty ratio detected by the duty ratio detector with a preset reference duty ratio and outputting a comparison result; A timer for integrating a driving time of the defrost heater; And an OR gate configured to logically combine the output of the comparator and the output of the timer and output the logic signal to the alarm sound generator. The method of claim 1, The one chip control circuit A protection circuit unit for allowing the control signal output from the control signal generator to be output or cut off to the first and second driving circuits according to the output of the abnormality determination unit; And a reset unit configured to output a reset signal to the control signal generator if the output voltage of the regulator is equal to or less than a reference voltage.