KR100207288B1 - Auto-temperature control device and its method - Google Patents

Abstract

The present invention provides a freezing / refrigerating driving unit and a power supply unit, a temperature sensing unit for detecting a change in a current temperature, a present temperature display unit for expressing a current temperature sensed by the temperature sensing unit, and a desired temperature by a user's operation. A set temperature input unit for setting and inputting a setting unit, an operating time input unit for setting and inputting an operating time of the refrigerating / refrigerating driving unit, and a display unit for displaying the set temperature and set time inputted by the set temperature input unit and the operating time input unit to the outside And a driving / stop input unit for switching operation of the freezing / refrigerating drive unit and a stop operation, and an operation state display unit for expressing an operation state of the freezing / refrigerating drive unit driven by a switching signal of the driving / stop input unit to the outside. A setting input through the current temperature input through the temperature sensing unit and the set temperature input unit Comparing the figures, the microcomputer outputs a sequential drive signal by performing a logical operation to sequentially drive the refrigeration / refrigeration drive unit for a predetermined time input through the operation time input unit, and receives a sequential drive signal of the microcomputer. It relates to an automatic temperature control device and a method comprising a contactless output unit for supplying the refrigeration / refrigeration drive unit, and a memory unit for storing the data read and logically calculated by the microcomputer, using a magnet conductor Instead of using the microcomputer to control the compression drive, the condensation drive and the evaporation drive in the refrigeration drive unit, the installation is simple, and the malfunction of the device is minimized. It works.

Description

Automatic temperature control device and method

The present invention relates to an automatic temperature control device and a method thereof, and in particular, a microcomputer can be configured to directly control a compression drive unit, a condensation drive unit, and an evaporation drive unit in a refrigerating / refrigeration drive unit to perform a more accurate temperature control function. The present invention relates to an automatic temperature control device and a method thereof.

In general, the automatic temperature control device refers to a device for controlling a refrigerating / freezing device which is driven to store various fruits and vegetables, fish, meat and the like at a low temperature or a frozen state.

The automatic temperature control apparatus according to the prior art defined as described above is mostly configured and used to indirectly control the compression drive unit, the condensation drive unit, and the evaporation drive unit through a magnet conductor.

At this time, when performing the long-term refrigeration / freezing function by the action of the refrigerant driven by the compression drive unit, the condensation drive unit and the evaporation drive unit, sometimes frost is generated, such generation of frost is frozen / refrigerated, such as various fruits and fish Since it causes the function to be degraded, a defrost heater driver, which is usually controlled by the operation of a timer, is installed to perform an appropriate defrost function.

However, since the automatic temperature control apparatus according to the prior art has a structure indirectly controlling the compression drive unit, the condensation drive unit, and the evaporation drive unit through the magnet conductor as described above, the control operation is difficult and the interconnection configuration is difficult, resulting in high productivity. Falling, there was a big disadvantage to make a more complex configuration because a separate device such as a timer must be installed in order to install the defrost heater drive required when removing the frost.

In addition, because of the complex configuration as described above, if the connection line is changed inadvertently by the installer, there is a problem that the malfunction of the device itself is easy to occur, and also difficult to repair, which is never convenient for maintenance.

In addition, there have been cases where a programmable logic controller has been used in the related art in order to compensate for the above-mentioned disadvantages and problems. However, the circuit configuration is complicated, and thus many connection lines are required, and a magnet conductor must be additionally installed. Discomfort was present.

Therefore, the present invention has been made in order to solve the above problems, the purpose is to install a structure that directly controls the refrigeration / refrigeration drive unit through a microcomputer instead of using a magnet conductor, The operation is simple and it provides an automatic temperature control device that can minimize the malfunction of the equipment.

In addition, another object of the present invention for solving the above problems can be optimized operation while minimizing damage to the product by the selective drive of the compression drive and the condensation drive, expansion valve, evaporation drive, etc. It is to provide an automatic temperature control method.

1 is a block diagram showing an automatic temperature control apparatus according to the present invention

* Explanation of symbols for main parts of the drawings

10: refrigeration / refrigeration drive unit 11: compression drive unit

12 condensation drive unit 13 expansion valve

14: evaporation drive unit 20: power supply unit

30: temperature sensing unit 31: current temperature display unit

41: set temperature input unit 42: operation time input unit

43: defrost time input unit 44: compression drive delay time input unit

45: evaporation drive delay time input unit 46: current temperature correction input unit

50: display unit 60: run / stop input unit

61: operation status display unit 70: microcomputer

80: solid state output unit 90: memory unit

100: defrost heater driving unit 110: electromagnetic valve driving unit

120: self diagnosis unit 130: warning sound output unit

140: manual defrost input unit

The automatic temperature control device according to the present invention for achieving the above object is at least a compression drive unit for compressing the refrigerant at a high temperature and high pressure, and a liquefaction by the condensation drive unit and the condensation drive unit for liquefying the high temperature and high pressure refrigerant by the compression drive unit In the automatic temperature control device comprising a refrigeration / refrigeration drive unit consisting of an expansion valve for expanding the refrigerant is evaporated and an evaporation drive unit for evaporating the refrigerant expanded through the expansion valve, and a power supply for converting the AC voltage into a DC drive voltage. A temperature sensing unit for detecting a change in the current temperature, a current temperature display unit for displaying the current temperature sensed by the temperature sensing unit to the outside, a set temperature input unit for setting and inputting a desired temperature by a user's operation; Driving to set and input an operation time of the refrigeration / refrigeration drive unit; A time input unit, a display unit for displaying the set temperature and the set time inputted by the set temperature input unit and the operation time input unit to the outside, a run / stop input unit for switching the operation and stop of the refrigeration / refrigeration drive unit, and the An operation state display unit for displaying the operation state of the freezer / refrigeration drive unit driven by a switching signal of an operation / stop input unit to the outside, a present temperature input through the temperature sensing unit, and a set temperature input through the set temperature input unit; Compared with the microcomputer for outputting the sequential drive signal by performing a logical operation to sequentially drive the refrigeration / refrigeration drive unit by the set time input through the operation time input unit, and receiving the sequential drive signal of the microcomputer And a contactless output unit for supplying a cooling / refrigeration drive unit and the microphone And a memory unit for storing data read and logically calculated by a computer.

In addition to the above configuration, a defrost heater driving unit for receiving a control signal of the microcomputer from the contactless output unit to increase the temperature to remove frost generated by the driving of the refrigeration / refrigeration driving unit, and the defrost heater driving unit It is preferable to further include a defrost time input unit for inputting a driving time to the microcomputer and being displayed on the display unit.

In addition to the above configuration, if the frost generated inside the refrigeration / refrigeration drive unit is not completely removed by external temperature and humidity despite the drive of the defrost heater drive unit, the defrost heater drive unit is manually driven to remove the remaining frost. It is preferable to further include a manual defrost input unit for inputting a manual drive signal to the microcomputer so as to be possible.

In addition to the above configuration, the control signal of the microcomputer is input from the contactless output unit to store and discharge the refrigerant according to the flow of pressure generated during the sequential stroke of the compression driving unit, the condensation driving unit, the expansion valve, and the evaporation driving unit. It is preferable to further provide an electromagnetic valve driving unit to maintain the pressure difference of.

In addition to the above configuration, in order to prevent self-damage caused by frequent operation and stop during on / off driving of the compression driver, a compression driver delay time input unit for inputting a driving delay time to the microcomputer, and after operation of the defrost heater driver. An evaporation driver delay time input unit for inputting a driving delay time to the microcomputer to stop the evaporation driver until latent heat in the evaporation driver until the normal operation of the refrigeration / refrigeration driver is absorbed by the compression driver. It is preferable to further provide.

In addition to the above configuration, if an error occurs when the present temperature recognized by the microcomputer through the temperature sensing unit is displayed on the present temperature display unit, the present temperature correction input unit corrects the error and inputs the correction to the microcomputer. It is preferable to provide.

In addition to the above configuration, if the compression drive unit, the condensation drive unit, the expansion valve, and the evaporation drive unit in the refrigeration / refrigeration drive unit is self-diagnosed and confirmed to be abnormal, the drive stops so that the microcomputer can stop the operation of the refrigeration / refrigeration drive unit. A self-diagnosis unit for generating a signal and transmitting an error signal to the display unit, and when it is determined that the freezing / refrigerating drive unit is abnormal through the self-diagnostic unit, generates a warning sound externally linked to a control signal of the microcomputer. It is preferable to further provide a warning sound output unit.

Automatic temperature control method according to the present invention for achieving the above another object, defrost step by the temperature to switch to the operating state ignoring the remaining defrost time when the defrost temperature controller is operated during the defrost heater drive unit defrost operation, defrost time The defrosting step by the time of continuously maintaining the defrost state for the set time input through the input unit and when the freezing / refrigerating drive unit is automatically operated by the comparison of the present temperature and the set temperature, only the compression drive unit stops and the evaporation drive unit continues to operate. Operation of the evaporation driver / compression driver for selecting an operation of driving the compression driver and the evaporation driver together, and automatically maintains the operation state when the power is applied again after the power failure or the power is cut off during normal operation. Input data storage step and all the states to reset A method of maintaining an optimal operating state by selecting and performing a call step on a microcomputer is applied.

Hereinafter, a preferred embodiment of the automatic temperature control device according to the present invention will be described with reference to FIG. 1.

1 is a block diagram showing an automatic temperature control apparatus according to the present invention.

As shown in FIG. 1, the automatic temperature control apparatus according to the present invention includes a power supply unit 20 for converting and supplying an AC voltage into a DC driving voltage, a compression drive unit 11 for compressing a refrigerant at high temperature and high pressure, and the compression. The condensation drive unit 12 for liquefying the high temperature and high pressure refrigerant by the drive unit 11 and the expansion valve 13 for expanding the refrigerant liquefied by the condensation drive unit 12 and the expansion valve 13 is expanded through The refrigerator / refrigeration drive unit 10 including the evaporation drive unit 14 for evaporating the refrigerant, the temperature sensing unit 30 for detecting a change in the current temperature, and the current temperature detected by the temperature sensing unit 30 The current temperature display unit 31 to display the display, a set temperature input unit 41 for setting and inputting a desired temperature by a user's operation, and an operation time input unit 42 for setting and inputting an operating time of the freezing / refrigerating driving unit 10. )Wow, Switching operation of the display unit 50 for expressing the set temperature and the set time inputted by the set temperature input unit 41 and the operation time input unit 42 to the outside, and the operation and stop of the refrigerating / refrigerating driving unit 10. An operation state display unit 61 for expressing an operation state of the freezing / refrigeration drive unit 10 driven by a switching signal of the operation / stop input unit 60 and the operation / stop input unit 60 to the outside; The freezing / refrigerating driving unit 10 is compared with the set temperature input through the operation time input unit 42 by comparing the current temperature input through the temperature sensing unit 30 and the set temperature input through the set temperature input unit 41. ) And a microcomputer 70 for outputting a sequential drive signal by performing a logical operation so as to drive sequentially, and receiving the sequential drive signal of the microcomputer 70 and supplying the sequential drive signal to the refrigeration / refrigeration drive unit 10. The contactless output section 80 and a memory section 90 for storing data read and logically calculated by the microcomputer 70, respectively.

At this time, the defrost heater driving unit for receiving a control signal of the microcomputer 70 to increase the temperature to remove the frost generated by the drive of the refrigeration / refrigeration drive unit 10 to the contactless output unit 80. 100 is connected, and the refrigerant is stored and discharged in accordance with the flow of pressure generated during the sequential stroke of the compression drive unit 11, the condensation drive unit 12, the expansion valve 13, the evaporation drive unit 14 to optimize The electromagnetic valve driving unit 110 to maintain the pressure difference is connected.

On the other hand, despite the drive of the defrost heater driving unit 100, the microcomputer 140 does not completely remove the frost generated inside the freezing / refrigerating drive unit 10 by external temperature and humidity. The manual defrosting input unit 140 for inputting a manual driving signal is connected so that the remaining frost can be completely removed by manually driving the driving unit 100.

A defrost time input unit 43 is connected to the microcomputer 70 to determine the driving time of the defrost heater driving unit 100 and to display the driving time on the display unit 50. The microcomputer 70 causes the microcomputer 70 to self-diagnose the compression drive 11, the condensation drive 12, the expansion valve 13, and the evaporation drive 14 in the refrigeration / refrigeration drive unit 10. The self-diagnosis unit 120 is configured to generate a driving stop signal to stop the operation of the refrigeration / refrigeration drive unit 10 and to transmit an error signal to the display unit 50.

On the other hand, when it is confirmed that the freezer / refrigeration drive unit 10 is abnormal through the self-diagnostic unit 120, the microcomputer 70 interlocks with a control signal of the microcomputer 70 to generate a warning sound to the outside. Warning sound output unit 130 is connected.

In addition, the microcomputer 70 is connected to a compression driver delay time input unit 44 for inputting a driving delay time in order to prevent self-damage caused by frequent driving and stopping during the on / off driving of the compression driver 11. The evaporation driver (until the latent heat in the evaporation driver 14 is absorbed by the compression driver 11 from the operation of the defrost heater driver 100 to the normal operation of the refrigeration / refrigeration driver 10). An evaporation driver delay time input unit 45 for inputting a driving delay time is connected to stop 14).

In addition, when an error occurs when the present temperature recognized by the microcomputer 70 is displayed on the present temperature display part 31, the microcomputer 70 corrects the error. The current temperature correction input unit 46 for inputting correction to the microcomputer 70 is connected.

Referring to the operation of the automatic temperature control device according to the present invention made of the above configuration as follows.

First, when the present temperature is 25 ° C (hereinafter referred to as the present temperature), the temperature sensor 30 detects the present temperature and supplies the present temperature to the microcomputer 70. The microcomputer 70 supplies the present temperature. Output to the current temperature display unit 31 and at the same time to store the data of the current temperature in the memory unit 90.

Thereafter, when the user inputs the microcomputer 70 through the set temperature input unit 41 to maintain a temperature of 20 ° C. (hereinafter referred to as a set temperature), the data signal of the set temperature is stored in the memory unit 90. It is compared with the current temperature stored in).

On the other hand, when the setting operation time is input to the microcomputer 70 through the operation time input unit 42 to operate the refrigeration / refrigeration driving unit 10 for about 10 hours (hereinafter referred to as the setting operation time), Data of the set operation time is stored in the memory unit 90 and displayed on the display unit 50.

And, in order to drive the defrost heater driving unit 100 for about 30 minutes (hereinafter referred to as the set defrost time) in order to remove the frost generated by the long-term driving of the refrigeration / refrigeration drive unit 10 defrost time input unit 43 When the defrosting time data is input to the microcomputer 70 through the data, the defrosting time data is also stored in the memory unit 90 and displayed on the display unit 50.

After that, when the user operates and operates the operation / stop input unit 60, the microcomputer 70 compares the present temperature and the set temperature stored in the memory unit 90 with each other and performs logical operation. The driving time and the set defrosting time are respectively read and the driving signal is sequentially output to the freezing / refrigeration driving unit 10 through the contactless output unit 80.

At this time, the compression drive unit 11 in the refrigerating / refrigerating drive unit 10 converts the refrigerant into high temperature and high pressure, and then liquefies through the condensation drive unit 12 so as to be expanded through the expansion valve 13 again. Then, it is possible to maintain the desired set temperature (20 ℃) by being injected through the evaporation drive unit (14).

In this operation, the defrost heater driving unit 100 is driven to remove frost for about 30 minutes which is already input through the defrosting time input unit 43 after the set operation time is maintained for 10 hours. And the sequential driving state at that time is displayed on the driving state display unit 61 to be visually confirmed to the user.

Here, when the defrost generated in the freezer / refrigeration drive unit 10 is not completely removed by the external temperature and humidity despite the drive of the defrost heater drive unit 100, the manual defrost input unit 140 may be manually operated. By operating the manual driving signal to the microcomputer 70 by operating the defrost heater driving unit 100 can be manually driven to completely remove the frost remaining in the freezing / refrigeration driving unit 10.

On the other hand, the electromagnetic valve drive unit 110 receives the control signal of the microcomputer 70 from the contactless output unit 80, the compression drive unit 11, condensation drive unit 12, expansion valve 13, The refrigerant is stored and discharged in accordance with the flow of pressure generated during the sequential stroke of the evaporation drive unit 14 to maintain the optimum pressure difference.

In addition, the compression driving unit 11, the condensation driving unit 12, the expansion valve 13, and the evaporation driving unit 14 in the freezing / refrigerating driving unit 10 are self-diagnosed by the self-diagnostic unit 120, respectively. When it is confirmed that the diagnosis result is abnormal, the microcomputer 70 generates a driving stop signal to stop the operation of the freezing / refrigerating driving unit 10 and simultaneously transmits an error signal to the display unit 50. .

In this case, when it is confirmed that the freezing / refrigerating driving unit 10 is abnormal through the self-diagnosis unit 120, the user may take a predetermined maintenance action by generating a warning sound to the outside through the warning sound output unit 130. To help.

On the other hand, the drive delay time data input through the compression driver delay time input unit 44 is calculated by the microcomputer 70 to prevent self-damage due to frequent operation and stop during on / off driving of the compression driver 11. The driving delay time data input through the evaporation driver delay time input unit 45 is also calculated by the microcomputer 70 to prevent the defrost heater driving unit 100 from being operated. It is possible to stop the evaporation drive unit 14 until the latent heat in the evaporation drive unit 14 until normal operation of 10) is absorbed by the compression drive unit 11.

The current temperature correction input unit 46 may generate an error when the current temperature recognized by the microcomputer 70 through the temperature sensor 30 is displayed on the current temperature display unit 31. The function of correcting and inputting the correction to the microcomputer 70 is modified.

On the other hand, the automatic temperature control method for achieving another object of the present invention, if the defrost temperature controller is operated during the defrost operation of the defrost heater driving unit 100 by the microcomputer 70 to ignore the remaining defrost time to switch to the operating state The refrigeration / refrigeration drive unit 10 is automatically operated by the defrosting step by the temperature and the comparison of the present temperature and the setting temperature by the defrosting step by the time of continuously maintaining the defrosting state for the set time inputted through the defrosting time input unit 43 and the defrosting time input unit 43. Evaporation drive 14 / compression that selects an operation to stop only the compression drive 11 and continue to drive the evaporation drive 14, or to drive the compression drive 11 and the evaporation drive 14 together when operated. An operation selection step of the drive unit 11 and an input data storage step and mode for automatically maintaining an operation state when power is applied again after a power failure or power is cut off during normal operation. To initialize the state each performing a selected self-protection step to prevent damage to the product, and while minimizing the damage to the product to maintain optimum operating conditions.

As described above, according to the automatic temperature control device and the method according to the present invention, instead of using a magnet conductor, the microcomputer controls the compression drive unit, the condensation drive unit, and the evaporation drive unit in the refrigeration / refrigeration drive unit. By the configuration, the installation work is simple, the malfunction of the device is minimized, and the productivity and accuracy are greatly improved.

In addition, by receiving input signals inputted through peripheral devices such as set temperature input unit and operation time input unit, the microcomputer can program and control the refrigeration / refrigeration drive unit automatically. The driving state and temperature of the product can be displayed to the outside, so the user can directly check the driving state of the product while driving the refrigerating / refrigerating drive unit, thereby achieving a more convenient and more accurate operation of the product.

In addition, the defrost heater driving unit which raises the temperature to remove the frost generated by the drive of the refrigeration / refrigeration drive unit can be operated manually and automatically, respectively, to prevent the phenomenon that the refrigeration / freezing function due to frost falls. It has a useful effect.

In addition, a smooth stroke of the refrigerating / refrigerating drive unit is provided by installing an electromagnetic valve driving unit for storing and discharging refrigerant according to the flow of pressure generated during the sequential stroke of the compression driving unit, the condensation driving unit, the expansion valve, and the evaporation driving unit to maintain an optimum pressure difference. There is a useful effect that can be achieved.

In addition, the latent heat in the evaporation drive unit from the compression drive unit delay time input unit and the defrost heater drive unit to the normal operation of the refrigeration / refrigeration drive unit to prevent self-damage caused by frequent operation and stop during the on / off drive of the compression drive unit. By providing an evaporation drive unit delay time input unit to stop the evaporation drive unit until it is absorbed by the compression drive unit, it is possible to prevent damage to the product due to frequent operation of the compression drive unit and the defrost heater drive unit, and at the same time save power. ) Has the effect of).

In addition, the self-diagnosis unit and the warning sound output unit is installed to notify the user so as to self-diagnose the product in the event of failure of the freezing / refrigerating drive unit, so that the user can take a more rapid action.

The principle, including the multifunctional advantages obtained from the automatic temperature control device and the method according to the present invention described so far, is not limited to the claims of the present invention described below, and its application and function are also skilled in the art. If it can be applied well through the embodiment of the detailed description.

Claims (8)

At least a compression drive unit for compressing the refrigerant at high temperature and high pressure, a condensation drive unit for liquefying the high temperature and high pressure refrigerant by the compression drive unit, an expansion valve for expanding the refrigerant liquefied by the condensation drive unit and a refrigerant expanded through the expansion valve In the automatic temperature control device comprising a refrigeration / refrigeration drive unit consisting of an evaporation drive unit for evaporating and a power supply unit for converting and supplying an AC voltage to a DC drive voltage, A temperature sensor for detecting a change in current temperature; A current temperature display unit displaying the current temperature sensed by the temperature sensing unit to the outside; A set temperature input unit for setting and inputting a desired temperature by a user's operation; An operation time input unit for setting and inputting an operation time of the refrigeration / refrigeration drive unit; A display unit which displays the set temperature and the set time inputted by the set temperature input unit and the operation time input unit to the outside; A driving / stop input unit for switching and operating the stop and the refrigeration / refrigeration drive unit; An operation state display unit displaying an operation state of the freezing / refrigerating drive unit driven by a switching signal of the operation / stop input unit to the outside; Comparing the current temperature input through the temperature sensing unit and the set temperature input through the set temperature input unit, the logical operation is sequentially performed to sequentially drive the freezing / refrigerating driving unit by the set time input through the operation time input unit. A microcomputer for outputting a driving signal, A contactless output unit which receives the sequential drive signal of the microcomputer and supplies it to the refrigeration / refrigeration drive unit; And a memory unit for storing data read and logically calculated by the microcomputer, respectively. The method of claim 1, A defrost heater driving unit which receives a control signal of the microcomputer from the contactless output unit and raises a temperature to remove frost generated by driving of the freezing / refrigerating driving unit; And a defrost time input unit configured to input the driving time of the defrost heater driving unit to the microcomputer and to be displayed on the display unit. The method according to claim 1 or 2, If the defrost generated inside the freezing / refrigerating drive unit is not completely removed by external temperature and humidity despite the drive of the defrost heater drive unit, the micro defroster may be manually driven to remove the remaining frost. And a manual defrost input unit for inputting a manual drive signal to the computer. The method of claim 1, The control signal of the microcomputer is input from the contactless output unit to store and discharge the refrigerant according to the flow of pressure generated during the sequential stroke of the compression driving unit, the condensation driving unit, the expansion valve, and the evaporation driving unit to maintain an optimum pressure difference. Automatic temperature control device characterized in that it further comprises an electronic valve drive to be made. The method of claim 1, A compression driver delay time input unit for inputting a driving delay time to the microcomputer to prevent self damage due to frequent driving and stopping during the on / off driving of the compression driver; A driving delay time is input to the microcomputer to stop the evaporation drive until the latent heat in the evaporation drive from the defrost heater drive to the normal operation of the refrigeration / refrigeration drive is absorbed by the compression drive. Automatic temperature control device characterized in that it further comprises an evaporation drive delay time input. The method of claim 1, If an error occurs when the current temperature recognized by the microcomputer through the temperature sensor is displayed on the current temperature display, the current temperature correction input unit for correcting the error and input the correction to the microcomputer further comprises Automatic temperature control. The method of claim 1, When the compression driving unit, the condensation driving unit, the expansion valve and the evaporation driving unit in the refrigeration / refrigeration drive unit is self-diagnosed, and generates an abnormality, the microcomputer generates a drive stop signal to stop the operation of the refrigeration / refrigeration drive unit and A self diagnosis unit for transmitting an error signal to the display unit at the same time; And a warning sound output unit configured to generate a warning sound externally linked with a control signal of the microcomputer when it is confirmed that the abnormality of the freezing / refrigerating drive unit is through the self-diagnosis unit. Defrost step by the temperature for ignoring the remaining defrost time and switching to the operating state if the defrost temperature controller operates during the defrost heater drive defrost operation; Defrost step by the time to maintain the defrost state for a predetermined time input through the defrost time input unit, The evaporation drive / compression selects an operation in which only the compression drive is stopped and the evaporation drive continues to be driven when the refrigeration / refrigeration drive is automatically operated by the comparison of the present temperature and the set temperature, or the operation of driving the compression drive and the evaporation drive together. An operation selection step of the driving unit; When the power is supplied again after the power failure or the power is cut off during normal operation, the microcomputer selects the input data storage step that automatically maintains the operating state and the self-protection step that initializes all states to prevent damage to the product. Automatic temperature control method characterized in that.

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