KR100565572B1 - A Refrigerator - Google Patents

Abstract

The refrigerator and the defrost heater are designed to display the operation status according to the internal temperature selected by the user by designing the control-related configuration of the refrigerator in the form of a one-chip using an ASIC (Application Specification Integrated Circuit). A sensing unit for sensing at least one in-vehicle state and selecting a desired in-vehicle temperature, a display unit for displaying an operating state according to the in-vehicle temperature selected by the sensing unit, and an in-vehicle temperature sensed by the sensing unit A display driver for outputting a signal so that an operation state according to the display unit can be displayed on the display unit, an operation condition setting unit for comparing the output of the sensing unit with predetermined reference values, and outputting a comparison result; Outputting a control signal for controlling the driving of the compressor or the defrost heater according to One chip with a built-in control signal generator, a regulator for converting commercial AC power into a DC power of a predetermined level for internal circuit operation, and an abnormality discriminating part for discriminating an output voltage of the regulator and an abnormal temperature inside the one chip control circuit. It is composed of a control circuit, and one-chip type control circuit using ASIC can display the operation status according to high internal temperature, thereby minimizing power consumption and improving energy efficiency.

 One Chip Control Circuit / Display

Description

Refrigerator {A Refrigerator}

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 display driver and the display 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 portion 306a: first and gate

306b: second and gate 307: reset unit

308: display driver 308a: fifth comparator

308b: Sixth Comparator 308c: Seventh Comparator

308d: eighth comparator 400: first driving circuit

401: first triac 402: relay

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

700: defrost heater 800: display unit

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 9, a defrost heater 10, a power rectifier 1 for full-wave rectification by dropping a commercial AC power source 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; A sensing unit (5) for detecting at least one in-flight condition, a key input unit (6) for selecting a desired internal temperature, and an output of the constant voltage unit (2) as a driving voltage and the sensing unit (5) and the microcomputer 4 for outputting a control signal for driving the load according to the at least one internal state input through the key input unit 6, and the reference clock pulse for the operation of the microcomputer 4 The clock signal generator 7 and the microcomputer 4 The driving circuit 8 which controls the driving of the compressor 9 and the defrost heater 10 in accordance with a control signal, and the internal temperature selected by the key input unit 6 according to the control signal of the microcomputer 4 are displayed. It is composed of a display unit 11 for. Here, reference numerals are the first to third capacitors C1 (C2) (C3) and resistors (R).

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 rectifying 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 predetermined level is less than or less, and a resistor R1 connected in parallel to the voltage detector 31. ) And capacitor C3.

The clock signal generator 7 is parallel with a crystal oscillator X-tal, capacitors C4 and C5 connected to both ends of the crystal oscillator X-tal, and the crystal oscillator X-tal. It consists of a resistor R2 to be connected.

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) has elapsed for a predetermined time or more, the microcomputer 4 outputs a 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 temperature of the evaporator (not shown) reaches a predetermined temperature after the defrosting heater 10 is heated and the defrosting is finished, the detection unit 5 detects this and outputs a signal to the microcomputer 4. (4) ends the defrosting operation when the temperature of the evaporator (not shown) rises above the set temperature.

In addition, the microcomputer 4 outputs a control signal for displaying the internal temperature or the operating state selected by the user through the key input unit 6, and the display unit 11 is connected to the control signal of the microcomputer 4. The high temperature or operating status is displayed accordingly.

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 high internal temperature state selected by the user under the control of the microcomputer, high power is required at a predetermined level or higher, thereby lowering 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 can display the operation state according to the high internal temperature so that the user can recognize Its purpose is to provide a refrigerator.

According to an embodiment of the present invention, a refrigerator includes a compressor, a defrost heater, a detector configured to detect at least one internal temperature and a user select a desired internal temperature, and the internal temperature selected by the detection unit. A display unit for displaying an operation state, a display driver for outputting a signal so that the operation state according to the internal temperature detected by the sensor is displayed on the display unit, and the output of the sensor unit by comparing the outputs with predetermined reference values An operating condition setting unit for outputting a comparison result, a control signal generating unit for outputting a control signal for controlling the driving of the compressor or the defrost heater according to the output of the operating condition setting unit, and a commercial AC power source for internal circuit operation. A regulator for converting to a DC power supply having a predetermined level, and an output voltage of the regulator and Is composed, including at least determine additional built-in one-chip control circuitry to determine the one-chip control circuit group than temperature inside has its features.

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, Figure 3 is a view showing the display driver and the display in detail 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 It is configured to include a display unit 800 for displaying the state in chamber signal output from the second driver circuit for driving 500 and the chip control circuit 300.

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 generator 302 for outputting a control signal for controlling the driving of the compressor 600 and the defrost heater 700 according to the output of the unit 301, and the operation of the control signal generator 302 Clock signal generator 303 for generating a reference clock pulse for the regulator and the regulator 304 for converting the rectified and smoothed power to a DC power of a predetermined level for internal circuit operation through the diode (D1) and capacitor (C1) And an abnormality determining unit 305 for determining an output voltage of the regulator 304 and a temperature abnormality in the one-chip control circuit 300 and the output of the control signal according to the output of the abnormality determining unit 305. The control signal of the unit 302 is the first and second spheres A protection circuit unit 306 for outputting or interrupting the circuit 400 and 500 and a reset unit for outputting a reset signal to the control signal generator 302 when an output voltage of the regulator 304 is less than or equal to a reference voltage. 307 and a display driver 308 for outputting a driving signal to display the driving state according to the internal temperature selected by the sensing unit 200 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 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 comparison result, and the temperature inside the one-chip control circuit 300 is based on the fourth comparator 305a. It is composed of an overheat detection unit 305b which provides a signal for protecting the internal circuit to another input of the fourth and fifth end gates 306a and 306b if the temperature is higher than the temperature.

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 thereof. 306a) to the second AND 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 first 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 second 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.

Meanwhile, as shown in FIG. 3, the display driver 308 receives an output that is variable according to the internal temperature selected by the user through the slide volume 203, compares the preset reference values with the preset reference values, and outputs the comparison result. The fifth to eighth comparators 308a, 308b, 308c, and 308d, the first transistor Q1 turned on in response to the output of the fifth comparator 308a, and the sixth comparator 308b. The second transistor Q2 turned on according to the output of the second transistor, the third transistor Q3 turned on according to the output of the seventh comparator 308c, and the second transistor Q3 turned on according to the output of the eighth comparator 308d. Consisting of a fourth transistor Q4.

Subsequently, the display unit 800 includes a first light emitting diode LED1 that is turned on when the first transistor Q1 is turned on and a second light emitting diode LED2 that is turned on when the second transistor Q2 is turned on. And a third light emitting diode LED3 which is turned on when the third transistor Q3 is turned on, and a fourth light emitting diode LED4 which is turned on when the fourth transistor Q4 is turned on.

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 detection value, and the operation condition setting unit 301 operates according to the detection 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 operation condition setting unit 301 is obtained. 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, if the evaporator surface temperature is 13 ° C. or more, “high” is less than 13 ° C. and “low” is output to the control signal generator 302 as a defrost setting signal.

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 may provide a control signal for controlling the driving of the compressor 600 and the defrost heater 700 in accordance with an operation condition according to the output of the operation condition setting unit 301. )

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.

In addition, 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, 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 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.

In addition, the display driver 308 compares the output according to the high temperature level selected by the user through the slide volume 203 of the sensing unit 200 with preset reference values, and according to the fifth to fifth temperatures according to the high temperature level. Eight comparators 308a, 308b, 308c and 308d will output a 'high' signal.

When the 'high' signal is output from the fifth comparator 308a, the first transistor Q1 is turned on to light up the first light emitting diode LED1. . When the 'high' signal is output from the sixth comparator 308b, the second transistor Q2 is turned on to light up the second light emitting diode LED2. It is a state.

In addition, when the 'high' signal is output from the seventh comparator 308c, the third transistor Q3 is turned on to light up the third light emitting diode LED3. to be. When the 'high' signal is output from the eighth comparator 308d, the fourth transistor Q4 is turned on to light up the fourth light emitting diode LED4. .

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

First, the one-chip control circuit using ASIC can display the operation status according to the high internal temperature, thereby minimizing the power consumption and improving the energy efficiency.

Second, since it is designed to efficiently control various loads such as a compressor and a defrost heater 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 product can be reduced and the competitiveness of the product can be improved.

Claims (3)

compressor; Defrost heater; A sensing unit for sensing at least one internal temperature and selecting a desired internal temperature of the user; A display unit for displaying an operation state according to the selected internal temperature through the detection unit; And, 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 for outputting a control signal for controlling the driving of the compressor or the defrost heater according to the output of the operating condition setting unit, and a regulator for converting commercial AC power into DC power of a predetermined level for internal circuit operation. And a one-chip control circuit in which an abnormality discrimination unit for determining an output voltage of the regulator and a temperature abnormality inside the one-chip control circuit is included. The method of claim 1, The display unit is a refrigerator, characterized in that composed of a plurality of light emitting diodes for displaying the operating state in the refrigerator according to the output of the display driver. The method of claim 1, The display driver A comparison unit which receives an output according to the selected internal temperature through the sensing unit and compares the output with preset reference values and outputs a comparison result; And a switching unit which is turned on according to the output of the comparing unit.

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