KR100364774B1 - A Refrigerator - Google Patents

Abstract

It relates to a refrigerator that can reduce the failure rate and power consumption rate of parts by performing efficient control with a one chip type control circuit using an ASIC instead of a mechanical part. The compressor, the evaporator, the defrost heater, and at least one internal state A sensing unit for sensing, an operating condition setting unit for comparing the output of the sensing unit with predetermined reference values for determining an operating condition of the refrigerator, and outputting a comparison result, and driving the compressor and the defrost heater according to the output of the operating condition setting unit A control signal generator for outputting a control signal for controlling a signal, a clock signal generator for generating a reference clock pulse for the operation of the control signal generator, and converting a commercial AC power source into a DC power source having a predetermined level for internal circuit operation. It consists of a one-chip control circuit with a built-in regulator to improve the cooling efficiency and reduce the power consumption. It is possible to improve the reliability of the product.

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 the configuration of a refrigerator according to the prior art, Figures 2a to 2c is a view showing a change in the operating state according to the intermittent operation and the defrosting operation of the refrigerator according to the prior art.

As shown in FIG. 1, the refrigerator according to the related art is a power source 10 for supplying a commercial AC power, a compressor 80 for converting a low / low pressure gas refrigerant into a high / high pressure gas refrigerant, and installed in a freezer compartment. The thermostat 20 for maintaining the freezer compartment at a predetermined temperature by controlling the operation of the compressor 80 according to a predetermined temperature condition, the defrost heater 50 for removing the defrost on the surface of the evaporator (not shown) Defrost timer 30 for switching the power supply to the defrost heater 50 and the compressor 80 according to the operation time of the compressor 80, and a defrost heater through the defrost timer 30 in accordance with a predetermined temperature condition ( And a first Def-Thermo (Defrost- Thermostat) 40 for determining whether power is supplied to the 50 and a fuse 60 and 70 for preventing overcurrent.

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

First, when power is applied through the power source 10, power is supplied to the compressor 80 through the thermostat 20 and the defrost timer 30 as shown in FIG. 2A, and the compressor 80 is driven accordingly.

At this time, since the internal temperature of the freezer compartment is high at the initial power input, the thermostat 20 is maintained in an 'on' state. That is, the thermostat 20 is configured to intermittently drive the compressor 80 within a preset temperature range. When the temperature in the freezer compartment high temperature exceeds the upper limit, the thermostat 20 operates the compressor 80 by operating 'on', If the temperature inside the freezer compartment drops below the lower limit, it will be 'off'. At the beginning of power input, the temperature inside the freezer compartment is high, so it remains 'on'.

In addition, when the initial power is applied, the defrost timer 30 is contacted to the compressor 80 and accordingly the compressor 80 is supplied with power and driven, and the driving is controlled within the set temperature range by the thermostat 20. .

Subsequently, as the compressor 80 and the fan motor (not shown) operate, cold air flows in the refrigerating chamber and the freezer compartment, and as the freezing cycle of the refrigerator proceeds, the temperature of the evaporator (not shown) is lower than that of the surroundings. Sexuality is conceived.

When the defrost timer 30 accumulates the driving time of the compressor 80 and the predetermined time (6 hours 40 minutes) elapses, the compressor 80 moves the contact toward the defrost heater 50 as shown in FIG. 2B. The drive of the defrost heater 50 is supplied with power through the contact of the defrost timer 30 and the dip thermostat 40 and generates heat to remove the defrost on the evaporator surface.

On the other hand, the deep-thermo 40 is 'off' as shown in Figure 2c when the surface temperature of the evaporator increases by more than a predetermined temperature (13 ℃) due to the operating characteristics according to the temperature change.

Therefore, since the defrost heater 50 is not supplied with power and stops its operation, and current flows through the timer T, the timer T moves the contact point toward the compressor 80 and simultaneously drives the compressor 80. The time integration operation resumes.

On the other hand, as the surface temperature of the evaporator is lowered again by the progress of the refrigeration cycle according to the operation of the compressor 80, when the temperature is lower than the predetermined temperature (13 ° C), the deep thermo 40 is 'on' again and the defrosting operation is performed. Is done.

As described above, after the defrosting is completed, the normal refrigeration cycle is resumed by driving the compressor 80 as shown in FIG. 2A.

The refrigerator according to the prior art has the following problems.

First, since various mechanical parts such as a defrost timer and a defrost thermostat are used, the failure rate increases when used for a long time, which in turn leads to a decrease in refrigeration efficiency.

Second, power consumption increases because defrosting operation is performed by using a defrost heater that consumes about twice as much power per day regardless of the degree of eroticism of the evaporator.

The present invention has been made to solve the above problems, and provides a refrigerator that can reduce the failure rate and power consumption rate of the components by performing efficient control with a one-chip type control circuit using ASIC instead of mechanical components. There is a purpose.

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

2a to 2c is a view showing a change in the operating state according to the intermittent operation and defrosting operation of the refrigerator according to the prior art

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

4 is a view showing a detailed configuration of FIG.

Explanation of symbols for main parts of the drawings

100: power 200: detector

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

306: protection circuit portion 306a: first end gate

306b: second and gate 400: first driving circuit

401: first triac 402: relay

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

700: defrost heater

The refrigerator according to the present invention compares a compressor, an evaporator, a defrost heater, a sensing unit for sensing at least one internal condition, and an output of the sensing unit with predetermined reference values for determining an operating condition of the refrigerator. An operation condition setting unit for outputting a control signal, a control signal generator for outputting a control signal for controlling driving of the compressor and the defrost heater according to the output of the operation condition setting unit, and generating a reference clock pulse for the operation of the control signal generator. And a one-chip control circuit including a clock signal generator and a regulator for converting a commercial AC power source into a DC power source having a predetermined level for internal circuit operation.

The refrigerator according to the present invention includes a compressor, a defrost heater, a first driving circuit for driving the compressor, a second driving circuit for driving the defrost heater, a sensing unit for sensing at least one in-fault condition, and An operating condition setting unit for comparing the negative output with predetermined reference values for determining an operating condition of the refrigerator and outputting a comparison result, and a control signal for controlling the driving of the compressor and the defrost heater according to the output of the operating condition setting unit. A control signal generator for outputting, a clock signal generator for generating a reference clock pulse for 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, and a regulator output An abnormality discrimination unit for discriminating an abnormality of the voltage and the internal temperature of the one-chip control circuit, and a control signal generator according to the output of the abnormality discrimination unit And a control signal is configured to include a one-chip control circuit built-in protection circuit to ensure that the output to the first or the drive circuit or the second drive circuit block to another feature.

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

3 is a view showing a refrigerator according to the present invention, Figure 4 is a view showing in more detail the refrigerator shown in FIG.

As shown in FIG. 3, the refrigerator according to the present invention includes a power supply (100) for supplying a commercial AC power supply, a diode (D1) and a capacitor for rectifying and smoothing the commercial AC power inputted through the power supply (100). C1), the compressor 600 for converting the low temperature / low pressure gas refrigerant into the high temperature / high pressure gas refrigerant, the defrost heater 700 for removing the defrost on the surface of the evaporator (not shown), detecting at least one in-high state One chip control circuit 300 for outputting a control signal for controlling the driving of the compressor 600 and the defrost heater 700 according to the detection unit 200, the detection signal of the detection unit 200, the one chip control The first driving circuit 400 for driving the compressor 600 according to the control signal output from the circuit 300, and the defrost heater 700 for driving the control signal output from the one chip control circuit 300 Second driving circuit 500, first to third for preventing overcurrent And fuses 101, 102, and 103.

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

The first driving circuit 400 is the first triac 401 is turned on / off according to the control signal of the one chip control circuit 300, 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 a control signal of the one chip control circuit 300.

As illustrated in FIG. 4, 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. 301, a control signal generator 302 for outputting a control signal for controlling driving of the compressor 600 and the defrost heater 700 according to the output of the operation condition setting unit 301, and the control signal generator The rectified and smoothed power supply through the clock signal generator 303 generating the reference clock pulse for the operation of the operation 302 and the diode D1 and the capacitor C1 is a DC power supply of a predetermined level for internal circuit operation. According to the output of the regulator 304, the output voltage of the regulator 304 and the abnormality determination unit 305 for determining the temperature abnormality inside the one-chip control circuit 300, the abnormality determination unit 305 The control signal of the control signal generator 302 The protection circuit unit 306 is output to the first and second driving circuits 400 and 500 or cut off.

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 each of the defrost sensor 201, the freezing sensor 202, and the slide volume 203.

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).

The abnormality determining unit 305 compares the output voltage level of the regulator 304 with a reference voltage level and outputs a result of the comparison, and when the temperature inside the one-chip control circuit 300 is equal to or higher than the reference temperature. An overheat detector 305b outputs a signal for protecting the internal circuit.

The protection circuit unit 306 logically multiplies the control signal output by 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, a second AND gate 306b that logically multiplies the control signal output by the control signal generator 302 to control the defrost heater 700 and the output of the abnormality discriminator 305 and outputs the result. It consists of. 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.

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

As shown in FIG. 4, when a commercial AC power is input through the power supply 100, the diode D1 and the capacitor C1 rectify and smooth the same to output pulse 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 inside temperature, the evaporator surface temperature and the user set temperature and outputs the detected value, and the operating condition setting unit 301 according to the detected value of the detection unit 200. The detailed operation is as follows.

That is, the defrost sensor 201 of the sensing unit 200 outputs a change in resistance value according to a change in the surface temperature of the evaporator in the form of a voltage due to the operation characteristics of the thermistor, and the voltage value is determined by the voltage division ratio with the third resistor R3. The voltage is divided by the input signal and input to the inverting terminal (-) of the first comparator 301a of the operation condition setting unit 301. The refrigeration sensor 202 outputs the resistance value change according to the temperature change in the freezer compartment in the form of a voltage, and the voltage value is divided by the voltage dividing ratio with the second resistor R2 to generate the second operation condition setting unit 301. The non-inverting terminal (+) of the comparator 301b is input. In addition, the slide volume 203 outputs a change in resistance value according to a user's adjustment in the form of a voltage, and the voltage value is divided by the voltage division ratio with the first resistor R1, so that the second comparator of the operating condition setting unit 301 is divided. The inverting terminal (-) of 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 compartment set temperature, The output of the second comparator 301b varies in proportion to the degree of change.

Subsequently, the first comparator 301a of the operation condition setting unit 301 compares the output voltage of the divided defrost sensor 201 with the first reference voltage V _ref1 and transmits the result to the control signal generator 302. Output 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 outputs the result to the control signal generator 302. In addition, the third comparator 301c compares the output voltage of the divided slide volume 203 with the second reference voltage V _ref2 and outputs the result to the control signal generator 302.

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, the control signal generator 302 is currently configured to operate according to the output of the first to third comparators 301a, 301b, and 301c based on the reference clock pulse supplied from the clock signal generator 303. The control signal for controlling the driving of the compressor 600 or the defrost heater 700 is output to the protection circuit unit 306 so as to fit.

In more detail, the output of the first to third comparators 301a, 301b, and 301c is logically operated according to internal logic as an input condition, and the operation result is output through the corresponding control signal line.

On the other hand, the fourth comparator 305a of the abnormality determination unit 305 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. FIG. If less than _ref1 ), a 'low' signal for preventing a malfunction of the circuit is output to the driving signal generator 306. 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. The first and second AND gates 306a and 306b of the protection circuit unit 306 determine abnormality according to their operating characteristics, that is, when the output is 'low' if any one of its 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 terminal to supply power to the compressor 600, and thus, the compressor 600 is driven and the refrigeration cycle is performed. In addition, 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. Defrosting on the surface of the evaporator is performed.

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 has the following effects.

First, the one-chip type control circuit using ASIC controls various loads such as compressors and defrost heaters, enabling accurate control and improving the refrigeration efficiency.

Second, since the one-chip type control device is used, the power consumption of the control device itself is low, and various loads such as the compressor and the defrost heater are efficiently controlled according to the operation state of the refrigerator.

Third, because the one-chip type control device is used, the reliability of the product can be improved even if the performance is degraded or the failure rate is low even when used for a long time.

Claims (9)

compressor; evaporator; Defrost heater; A first driving circuit for driving the compressor; A second driving circuit for driving the defrost heater; 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, and controlling the operation of the compressor and the defrost heater according to the output of the operation condition setting unit; A control signal generator for outputting a control signal, 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 at a predetermined level for internal circuit operation; And an abnormality determining unit for determining an abnormality in the output voltage of the regulator and an internal temperature of the one-chip control circuit, and a control signal of the control signal generating unit is output to the first driving circuit or the second driving circuit according to the output of the abnormality determining unit. It consists of a one-chip control circuit with a built-in protection circuit for output or cut off Refrigerator with. 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 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 3, 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. compressor; Defrost heaters; A first driving circuit for driving the compressor; A second driving circuit for driving the defrost heater; 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, and controlling the operation of the compressor and the defrost heater according to the output of the operation condition setting unit; A control signal generator for outputting a control signal, 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 at a predetermined level for internal circuit operation; And an abnormality determining unit for determining an abnormality in the output voltage of the regulator and an internal temperature of the one-chip control circuit, and a control signal of the control signal generating unit is output to the first driving circuit or the second driving circuit according to the output of the abnormality determining unit. It consists of a one-chip control circuit with a built-in protection circuit for output or cut off Refrigerator. The method of claim 5, The operating condition setting unit And at least one comparator configured to compare each sensing signal with a preset reference signal and output a comparison result. The method of claim 5, 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. The method of claim 5, 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. The method of claim 5, 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.