Refrigerator defrosting control method and system and refrigerator

Abstract

The invention provides a refrigerator defrosting control method and system and a refrigerator, and relates to the technical field of refrigerator defrosting, the control system comprises a main control MCU, a temperature sensor, an optocoupler, a silicon controlled rectifier and a defrosting heater, and the optocoupler, the silicon controlled rectifier and the defrosting heater are electrically connected in sequence. And when the defrosting heater is started, defrosting is carried out by detecting the freezing evaporation temperature. The scheme has the advantages of low power consumption, high intelligent degree, high reliability, no noise, no device life limit and no cost exceeding a relay scheme; whether the defrosting process is executed or not is controlled according to the display control instruction, segmented control is conducted through software, initial direct heating is conducted, starting / stopping fine control is conducted, and the energy-saving effect is good.

Description

Technical Field

[0001] The present application relates to the technical field of refrigerator defrosting, and in particular to a refrigerator defrosting control method, a control system and a refrigerator. Background Art

[0002] A refrigerator is a refrigeration device that maintains a constant low temperature. It is also a civilian product that keeps food or other items at a constant low temperature.

[0003] Refrigerator frost refers to the phenomenon that frost or ice appears in the freezer or refrigerator compartment inside the refrigerator. This will not only affect the refrigeration effect of the refrigerator, but also increase energy consumption and reduce the service life of the refrigerator.

[0004] At present, the defrost control of refrigerators uses a relay to drive the defrost heater, which has the disadvantage that the defrost heater is continuously turned on, resulting in energy waste. Summary of the invention

[0005] The embodiments of the present application provide a refrigerator defrost control method, a control system and a refrigerator, which adopt an electronic control board MCU to receive display control commands through UART communication to realize the start and stop of the defrost heater. When the defrost heating is turned on, the defrost control rules are automatically adjusted by detecting the freezing evaporation temperature to achieve the purpose of defrosting and energy saving, thereby solving the problem of the existing refrigerator defrost method in which the defrost heater is continuously turned on, causing energy waste.

[0006] In a first aspect, an embodiment of the present application provides a refrigerator defrosting control method, comprising:

[0007] In response to an instruction for starting a defrost process, controlling a defrost heater to turn on;

[0008] Get the actual temperature of freezing and evaporation and compare it with the preset temperature;

[0009] When the actual temperature is lower than the first preset temperature, the defrost heater is kept turned on, and the first duration of the defrost heater being turned on is recorded;

[0010] When the first time length reaches the first time period, repeating the step of obtaining the actual temperature of the freezing evaporation and comparing it with the preset temperature;

[0011] When the actual temperature is greater than or equal to the third preset temperature, the defrost heater is controlled to be turned off.

[0012] In a feasible implementation, the refrigerator defrosting control method further includes:

[0013] When the actual temperature is greater than the first preset temperature and less than the second preset temperature, then:

[0014] Control the defrost heater to turn off and record the second duration of the turn-off;

[0015] When the second time reaches the second time period; controlling the defrost heater to turn on and maintain the third time period; judging whether the first total time reaches the fourth time period, the first total time is the sum of all the second time periods and the third time periods;

[0016] If the first total time reaches the fourth time period, the step of obtaining the actual temperature of the freezing evaporation and comparing it with the preset temperature is repeated;

[0017] If the first total time does not reach the fourth time period, the steps of controlling the defrost heater to be turned off and recording the second time period of the turning off are repeated.

[0018] In a feasible implementation, the refrigerator defrosting control method further includes:

[0019] When the actual temperature is greater than the second preset temperature and less than the third preset temperature, then:

[0020] Control the defrost heater to turn off and record the third duration of the shutdown;

[0021] When the third time reaches the fifth time period; controlling the defrost heater to turn on and maintain the sixth time period; judging whether the second total time reaches the seventh time period, the second total time is the sum of all the fifth time periods and the sixth time periods that have passed;

[0022] If the second total time reaches the seventh time period, the step of obtaining the actual temperature of the freezing evaporation and comparing it with the preset temperature is repeated;

[0023] If the second total time does not reach the seventh time period, the steps of controlling the defrost heater to be turned off and recording the third time period of the turning off are repeated.

[0024] In a feasible implementation manner, the second time period is equal to the fifth time period.

[0025] In a feasible implementation, the third time period is greater than the sixth time period.

[0026] In a second aspect, an embodiment of the present application provides a control system, which executes the above-mentioned refrigerator defrosting control method.

[0027] In a feasible implementation, the control system includes:

[0028] A main control MCU, wherein the main control MCU is configured to receive a display control command to start a defrosting process;

[0029] An optocoupler, a thyristor and a defrost heater are electrically connected in sequence, and the optocoupler is electrically connected to the main control MCU; when the main control MCU controls the defrost heater signal to be set to a low level, the optocoupler, the thyristor and the defrost heater are all powered on and work; when the main control MCU controls the defrost heater signal to be set to a high level, the optocoupler, the thyristor and the defrost heater are all powered off and do not work;

[0030] A temperature sensor, the temperature sensor is electrically connected to the main control MCU, and the temperature sensor is configured to detect the actual temperature of the freezing evaporation and transmit it to the main control MCU;

[0031] The main control MCU has a timing module and a storage module, and the storage module stores a first preset temperature, a third preset temperature and a first time period; the main control MCU is configured as follows: when the actual temperature is lower than the first preset temperature, the main control MCU controls the defrost heater signal to be set to a low level, the optocoupler, the thyristor and the defrost heater are all turned on, and the timing module starts timing at the same time; when the timing module reaches the first time period, the main control MCU re-acquires the actual temperature of the freezing evaporation detected by the temperature sensor;

[0032] The main control MCU is further configured to: when the actual temperature is greater than or equal to a third preset temperature, the main control MCU controls the defrost heater signal to be set to a high level, and the optocoupler thyristor and the defrost heater are both turned off.

[0033] In a feasible implementation, the storage module further stores a second preset temperature, a second time period, a third time period, and a fourth time period;

[0034] The main control MCU is further configured to: when the actual temperature is greater than the first preset temperature and less than the second preset temperature, the main control MCU controls the defrost heater to be powered off, and the timing module starts timing at the same time;

[0035] When the timing module reaches the second time period and restarts the timing, the main control MCU controls the defrost heater to be powered on, and the timing module restarts the timing;

[0036] When the timing module reaches the third time period, the main control MCU calculates a first total time, where the first total time is the sum of all the second time periods and the third time periods that have passed;

[0037] When the first total time reaches the fourth time period, the main control MCU re-acquires the actual temperature of the freezing evaporation detected by the temperature sensor;

[0038] When the first total time does not reach the fourth time period, the main control MCU repeats the above control steps of controlling the defrost heater to be turned off and the timing module starts timing.

[0039] In a feasible implementation, the storage module further stores a fifth time period, a sixth time period, and a seventh time period;

[0040] The main control MCU is further configured to: when the actual temperature is greater than the second preset temperature and less than the third preset temperature, the main control MCU controls the defrost heater to be powered off, and the timing module starts timing at the same time;

[0041] When the timing module reaches the fifth time period and restarts the timing, the main control MCU controls the defrost heater to be powered on, and the timing module restarts the timing;

[0042] When the timing module reaches the sixth time period, the main control MCU calculates a second total time, where the second total time is the sum of all the fifth time periods and the sixth time periods that have passed;

[0043] When the second total time reaches the seventh time period, the main control MCU re-acquires the actual temperature of the freezing evaporation detected by the temperature sensor;

[0044] When the second total time does not reach the seventh time period, the main control MCU repeats the above control steps of controlling the defrost heater to be turned off and the timing module starts timing.

[0045] In a third aspect, an embodiment of the present application provides a refrigerator comprising the above-mentioned control system.

[0046] This application adopts the electronic control board MCU to accept the display control command through UART communication to realize the start and stop of the defrost heater. When the defrost heater is turned on, defrosting is performed by detecting the freezing evaporation temperature. This solution has low power consumption, high intelligence, high reliability, no noise, no device life limit, and the cost is not higher than the relay solution; it controls whether to execute the defrost process according to the display control command, and performs segmented control through software, from the initial direct heating to the refined control of start / stop, with good energy saving effect.

[0047] The defrost control device disclosed in the present application is a thyristor electronic control device for refrigerators. This solution has high intelligence, high reliability, no noise, and no life limit for components. The incremental power consumption during a single defrost and recovery period is significantly reduced, and the cost does not exceed that of a relay solution. Whether to execute the defrost process is controlled according to display control instructions, and segmented control is performed through software, from initial heating to fine control of start / stop, with good energy-saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a flow chart of the refrigerator defrosting control method provided by the present application;

[0049] Figure 2 It is a timing diagram of the refrigerator defrosting control method provided by the present application;

[0050] Figure 3 It is a circuit diagram of the control system provided by this application.

[0051] Description of reference numerals:

[0052] 10-main control MCU; 20-optical coupler; 30-thyristor; 40-defrost heater; 50-temperature sensor. DETAILED DESCRIPTION

[0053] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present application.

[0054] At present, the defrost control of refrigerators uses a relay to drive the defrost heater. The disadvantages include clicking noise when the relay is activated, slow switch response, and short life. The thyristor technology is very mature in China, with chip packaging, diversified specifications, low power consumption, and a lower price than relays of the same specifications. It has no noise, no life limit, and a fast switch response speed.

[0055] "A refrigerator defrosting device, control method and refrigerator" This patent mainly discloses that when the evaporator needs to be defrosted, the indoor ambient air can be directly used to assist in heating and defrosting the evaporator. Compared with ordinary electric heating defrosting, the power consumption and electricity consumption are small, and the overall energy consumption of the refrigerator will not increase significantly. It solves the problem of high power consumption during the defrosting process and increased overall energy consumption of the refrigerator due to increased defrosting increments.

[0056] The patent "A Refrigerator Defrosting Control Device" mainly describes how to achieve rapid defrosting and reduce energy consumption through the evaporator and the main control board, and spraying graphene coating on the evaporator surface.

[0057] The above two patents are different from the direction of this solution. This solution mainly proposes a new refrigerator defrosting device control method from the combination of software and hardware.

[0058] The present application aims to solve the deficiencies of the above-mentioned prior art and provide a highly reliable and intelligent new defrosting control device for refrigerators;

[0059] 1. This application adopts the electronic control board MCU to accept display control commands through UART communication to realize the start and stop of the defrost heater. When the defrost heating is turned on, the defrost control rules are automatically adjusted by detecting the freezing evaporation temperature to achieve the purpose of defrosting and energy saving.

[0060] 2. Since the present application uses thyristor to drive the AC defrost heater, the thyristor can be quickly turned on and off through MCU control. Different control rules are implemented in different temperature ranges by detecting the freezing evaporation temperature.

[0061] 3. This application adopts a combination of software and hardware to implement a segmented defrosting method for the freezing evaporation temperature, thereby avoiding the continuous opening of the defrost heater and causing energy waste.

[0062] The refrigerator defrost control method, control system and specific structure of the refrigerator provided in the present application are described in detail below in conjunction with the accompanying drawings.

[0063] Reference Figure 1-Figure 2 As shown, the embodiment of the present application provides a refrigerator defrosting control method. Figure 2 In the figure, the horizontal axis is time t, the vertical axis is defrost heater filter W, and the refrigerator defrost control method includes:

[0064] In response to an instruction for starting a defrost process, controlling a defrost heater to turn on;

[0065] S1: Obtain the actual temperature of the freezing evaporation and compare it with the preset temperature.

[0066] The main control MCU has an input module, a time module and a storage module. The input module can be a touch screen or a key. The user can input the preset temperature and preset time to the main control MCU through the input module. The storage module can be a memory card. The preset temperature data is stored in the storage module.

[0067] After the main control MCU receives the command to start the defrost process from the display control, the MCU first controls the defrost heater signal HSXH to a low level (DI1 is set to 0), and after the optocoupler N1 (high and low voltage isolation) is turned on, the gate of the thyristor TR1 is energized and controllably turned on, and the defrost heater Rw1 starts heating after being energized;

[0068] After the defrost heater is powered on, the temperature sensor and the time module work synchronously, the time module starts timing, the temperature sensor monitors the actual temperature of the freezing evaporator and transmits it to the main control MCU, and the main control MCU compares the actual temperature with the preset temperature.

[0069] S2: When the actual temperature is lower than the first preset temperature, the defrost heater is kept turned on, and the first duration of the defrost heater being turned on is recorded;

[0070] When the first time length reaches the first time period, repeating the step of obtaining the actual temperature of the freezing evaporation and comparing it with the preset temperature;

[0071] The preset temperature includes a first preset temperature, and the preset time includes a first time period. When the actual temperature is lower than the first preset temperature, the main control MCU controls the defrost heater to continue to be turned on to heat the freezing evaporator, and the time module starts to record the first time length of the defrost heater being turned on until the first time length reaches the first time period T1;

[0072] When the first time reaches the first time period T1, the steps of obtaining the actual temperature of the freezing evaporator and comparing it with the preset temperature are repeated, specifically: the main control MCU monitors the actual temperature of the freezing evaporator again through the temperature sensor and compares it with the preset temperature.

[0073] S3: When the actual temperature is greater than or equal to the third preset temperature, the defrost heater is controlled to be turned off.

[0074] The preset temperature also includes a third preset temperature, which is greater than the first preset temperature. The main control MCU compares the actual temperature with the third preset temperature. When the actual temperature is greater than or equal to the third preset temperature, it means that the refrigeration evaporator does not need heating and defrosting, so the main control MCU controls the refrigeration evaporator to cut off the power.

[0075] like Figure 1 and Figure 2 As shown, in some embodiments, the refrigerator defrost control method further includes:

[0076] The preset temperature also includes a second preset temperature, the first preset temperature is less than the second preset temperature and less than the third preset temperature; when the actual temperature is greater than the first preset temperature and less than the second preset temperature, then:

[0077] S4: Control the defrost heater to turn off, and record the second duration of the turn-off;

[0078] When the actual temperature is greater than the first preset temperature, it means that the defrost heater does not need to heat the refrigeration evaporator at full power, and the main control MCU controls the defrost heater to power off, and the time module records the second time length from the shutdown time;

[0079] S5: when the second time reaches the second time period; control the defrost heater to turn on and maintain the third time period; determine whether the first total time reaches the fourth time period, the first total time is the sum of all the second time periods and the third time periods;

[0080] If the first total time reaches the fourth time period, the step of obtaining the actual temperature of the freezing evaporation and comparing it with the preset temperature is repeated;

[0081] If the first total time does not reach the fourth time period, the steps of controlling the defrost heater to be turned off and recording the second time period of the turning off are repeated.

[0082] The preset time includes a second time period T2, a third time period T3 and a fourth time period T4;

[0083] When the second time length recorded by the time module reaches the second time period T2, the main control MCU controls the defrost heater to turn on and maintain the third time period T3;

[0084] The main control MCU calculates a first total time, where the first total time is the sum of all the second time periods T2 and the third time periods T3 that have passed;

[0085] When the first total time is less than the fourth time period T4, the defrost heater is repeatedly controlled to be turned off, and the second duration of the turn-off is recorded;

[0086] When the first total time is greater than or equal to the fourth time period T4, the steps of obtaining the actual temperature of freezing and evaporation and comparing it with the preset temperature are repeated.

[0087] In some embodiments, the refrigerator defrost control method further includes:

[0088] When the actual temperature is greater than the second preset temperature and less than the third preset temperature, then:

[0089] S6: Control the defrost heater to turn off, and record the third duration of the turn-off;

[0090] When the actual temperature is greater than the second preset temperature, it means that the defrost heater does not need high power to heat the refrigeration evaporator, and the main control MCU controls the defrost heater to be powered off, and the time module records the third time length from the shutdown time;

[0091] S7: When the third time reaches the fifth time period; control the defrost heater to turn on and maintain the sixth time period; determine whether the second total time reaches the seventh time period, and the second total time is the sum of all the fifth time periods and the sixth time periods that have passed;

[0092] If the second total time reaches the seventh time period, the step of obtaining the actual temperature of the freezing evaporation and comparing it with the preset temperature is repeated;

[0093] If the second total time does not reach the seventh time period, the steps of controlling the defrost heater to be turned off and recording the third time period of the turning off are repeated.

[0094] like Figure 1 and Figure 2 As shown, the preset time includes a fifth time period T5, a sixth time period T6 and a seventh time period T7;

[0095] When the third time length recorded by the time module reaches the fifth time period T5, the main control MCU controls the defrost heater to turn on and maintain the sixth time period T6;

[0096] The main control MCU calculates a second total time, where the second total time is the sum of all the fifth time periods T5 and the sixth time periods T6 that have passed;

[0097] When the second total time is less than the seventh time period T7, the defrost heater is repeatedly controlled to be turned off, and the third duration of the turn-off is recorded;

[0098] When the second total time is greater than or equal to the seventh time period T7, the steps of obtaining the actual temperature of the freezing evaporation and comparing it with the preset temperature are repeated.

[0099] Reference Figure 2 As shown, in some embodiments, the second time period and the fifth time period may be equal in length or unequal in length.

[0100] In some embodiments, the duration of the third time period T3 is greater than the duration of the sixth time period T6.

[0101] Reference Figure 3 As shown, an embodiment of the present application provides a control system, which executes the above-mentioned refrigerator defrost control method.

[0102] Reference Figure 3 As shown, in some embodiments, the control system includes;

[0103] The main control MCU 10 is configured to receive a display control command to start a defrosting process;

[0104] The optocoupler 20, the thyristor 30 and the defrost heater 40 are electrically connected in sequence, and the optocoupler 20 is electrically connected to the main control MCU 10; when the main control MCU 10 controls the defrost heater signal to be set to a low level, the optocoupler 20, the thyristor 30 and the defrost heater 40 are all powered on and work; when the main control MCU controls the defrost heater signal to be set to a high level, the optocoupler 20, the thyristor 30 and the defrost heater 40 are all powered off and do not work;

[0105] A temperature sensor 50, wherein the temperature sensor 50 is electrically connected to the main control MCU 10, and the temperature sensor 50 is configured to detect the actual temperature of the freezing evaporation and transmit it to the main control MCU 10;

[0106] The main control MCU 10 has a timing module and a storage module, and the storage module stores a first preset temperature, a third preset temperature and a first time period; the main control MCU 10 is configured as follows: when the actual temperature is lower than the first preset temperature, the main control MCU 10 controls the defrost heater signal to be set to a low level, the optical coupler 20, the thyristor 30 and the defrost heater 40 are all turned on, and the timing module starts timing at the same time; when the timing module reaches the first time period, the main control MCU 10 re-acquires the actual temperature of the freezing evaporation detected by the temperature sensor 50;

[0107] The main control MCU 10 is further configured to: when the actual temperature is greater than or equal to the third preset temperature, the main control MCU controls the defrost heater signal to be set to a high level, and the optical coupler 20, the thyristor 30 and the defrost heater 40 are all turned off.

[0108] In some embodiments, the storage module further stores a second preset temperature, a second time period, a third time period, and a fourth time period;

[0109] The main control MCU 10 is further configured to: when the actual temperature is greater than the first preset temperature and less than the second preset temperature, the main control MCU 10 controls the defrost heater to be powered off, and the timing module starts timing at the same time;

[0110] When the timing module reaches the second time period and restarts the timing, the main control MCU10 controls the defrost heater to be powered on, and the timing module restarts the timing;

[0111] When the timing module reaches the third time period, the main control MCU 10 calculates a first total time, where the first total time is the sum of all the second time periods and the third time periods that have passed;

[0112] When the first total time reaches the fourth time period, the main control MCU 10 re-acquires the actual temperature of the freezing evaporation detected by the temperature sensor 50;

[0113] When the first total time does not reach the fourth time period, the main control MCU 10 repeats the above control steps of controlling the defrost heater to be turned off and the timing module starts timing.

[0114] In some embodiments, the storage module further stores a fifth time period, a sixth time period, and a seventh time period;

[0115] The main control MCU 10 is further configured to: when the actual temperature is greater than the second preset temperature and less than the third preset temperature, the main control MCU 10 controls the defrost heater to be powered off, and the timing module starts timing at the same time;

[0116] When the timing module reaches the fifth time period and restarts the timing, the main control MCU 10 controls the defrost heater to be powered on, and the timing module restarts the timing;

[0117] When the timing module reaches the sixth time period, the main control MCU 10 calculates a second total time, where the second total time is the sum of all the fifth time periods and the sixth time periods that have passed;

[0118] When the second total time reaches the seventh time period, the main control MCU 10 reacquires the actual temperature of the freezing evaporation detected by the temperature sensor 50;

[0119] When the second total time does not reach the seventh time period, the main control MCU 10 repeats the above control steps of controlling the defrost heater to be turned off and the timing module starts timing.

[0120] After the main control MCU (U1) receives the command to start the defrost process from the display control, the main control MCU first controls the defrost heater signal HSXH to a low level (DI1 is set to 0). After the optocoupler N1 (high and low voltage isolation) is turned on, the gate of the thyristor TR1 is energized and controllably turned on, and the defrost heater Rw1 starts heating after being energized.

[0121] When the main control MCU detects that the freezing evaporation temperature (Rt1) is lower than the first preset temperature, the defrost heater is kept on continuously (i.e. within the T1 period) to achieve the purpose of rapid temperature rise;

[0122] When it is detected that the freezing evaporation temperature is greater than the first preset temperature and less than the second preset temperature, the second stage of defrosting is entered. The main control MCU controls the defrost heater signal (HSXH) to be built-in high (DI1 is set to 1) during the T2 time, so that the defrost heater stops heating. The defrost heater signal (HSXH) is controlled to be built-in low (DI1 is set to 0) during the T3 time, and the defrost heater is turned on. This cycle works (within the T4 period), and the segmented start-stop method is adopted to avoid high power consumption when continuously turned on, and also make the refrigerator wall heated more evenly.

[0123] When the refrigeration evaporation temperature is greater than the second preset temperature and less than the third preset temperature, the fine defrost mode is entered, and the main control MCU controls the defrost heater signal (HSXH) to be built-in high (DI1 is set to 1) at T5 time, so that the defrost heater stops heating, and controls the defrost heater signal (HSXH) to be built-in low (DI1 is set to 0) at T6 time (T6<T3), the defrost heater is turned on, and the cycle work (within T7 period) is more thorough in defrosting and lower in energy consumption (the minimum increase in defrosting compared with the same period can be reduced by more than 5%);

[0124] When the freezing evaporation temperature is greater than the third preset temperature, the DI1 port of the MCU is set to 1, the optocoupler N1 is turned off, the thyristor is turned off, the defrost heater stops working, and the defrost ends.

[0125] An embodiment of the present application provides a refrigerator, comprising the above-mentioned control system.

[0126] It is easy to understand that those skilled in the art can combine, split, reorganize, etc. the embodiments of the present application to obtain other embodiments based on the several embodiments provided in the present application, and these embodiments do not exceed the protection scope of the present application.

[0127] The above specific implementation methods further explain in detail the purpose, technical solutions and beneficial effects of the embodiments of the present application. It should be understood that the above are only specific implementation methods of the embodiments of the present application and are not used to limit the protection scope of the embodiments of the present application. Any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. A refrigerator defrosting control method, characterized in that: include; In response to an instruction for starting a defrost process, controlling a defrost heater to turn on; Get the actual temperature of freezing and evaporation and compare it with the preset temperature; When the actual temperature is lower than the first preset temperature, the defrost heater is kept turned on, and the first duration of the defrost heater being turned on is recorded; When the first time length reaches the first time period, repeating the step of obtaining the actual temperature of the freezing evaporation and comparing it with the preset temperature; When the actual temperature is greater than or equal to the third preset temperature, the defrost heater is controlled to be turned off.

2. The refrigerator defrosting control method according to claim 1, characterized in that: The refrigerator defrost control method also includes: When the actual temperature is greater than the first preset temperature and less than the second preset temperature, then: Control the defrost heater to turn off and record the second duration of the turn-off; When the second time reaches the second time period; controlling the defrost heater to turn on and maintain the third time period; judging whether the first total time reaches the fourth time period, the first total time is the sum of all the second time periods and the third time periods; If the first total time reaches the fourth time period, the step of obtaining the actual temperature of the freezing evaporation and comparing it with the preset temperature is repeated; If the first total time does not reach the fourth time period, the steps of controlling the defrost heater to be turned off and recording the second time period of the turning off are repeated.

3. The refrigerator defrosting control method according to claim 2, characterized in that: The refrigerator defrost control method also includes: When the actual temperature is greater than the second preset temperature and less than the third preset temperature, then: Control the defrost heater to turn off and record the third duration of the shutdown; When the third time reaches the fifth time period; controlling the defrost heater to turn on and maintain the sixth time period; judging whether the second total time reaches the seventh time period, the second total time is the sum of all the fifth time periods and the sixth time periods that have passed; If the second total time reaches the seventh time period, the step of obtaining the actual temperature of the freezing evaporation and comparing it with the preset temperature is repeated; If the second total time does not reach the seventh time period, the steps of controlling the defrost heater to be turned off and recording the third time period of the turning off are repeated.

4. The refrigerator defrosting control method according to claim 3, characterized in that: The second time period is equal to the fifth time period.

5. The refrigerator defrosting control method according to claim 3, characterized in that: The third time period is greater than the sixth time period.

6. A control system, applied to a refrigerator, characterized in that: The control system executes the refrigerator defrosting control method according to any one of claims 1 to 5.

7. The control system according to claim 6, characterized in that: The control system comprises: A main control MCU (10), the main control MCU (10) being configured to receive a display control command for starting a defrosting process; An optocoupler (20), a thyristor (30) and a defrost heater (40) are electrically connected in sequence, and the optocoupler (20) is electrically connected to the main control MCU (10); when the main control MCU (10) controls the defrost heater signal to be set to a low level, the optocoupler (20), the thyristor (30) and the defrost heater (40) are all powered on and work; when the main control MCU controls the defrost heater signal to be set to a high level, the optocoupler (20), the thyristor (30) and the defrost heater (40) are all powered off and do not work; A temperature sensor (50), the temperature sensor (50) being electrically connected to the main control MCU (10), the temperature sensor (50) being configured to detect an actual temperature of freezing and evaporation and transmit the temperature to the main control MCU (10); The main control MCU (10) comprises a timing module and a storage module, wherein the storage module stores a first preset temperature, a third preset temperature and a first time period; the main control MCU (10) is configured such that: when the actual temperature is lower than the first preset temperature, the main control MCU (10) controls the defrost heater signal to be set to a low level, the optical coupler (20), the thyristor (30) and the defrost heater (40) are all turned on, and the timing module starts timing at the same time; when the timing module reaches the first time period, the main control MCU (10) re-acquires the actual temperature of the frozen evaporation detected by the temperature sensor (50); The main control MCU (10) is also configured such that: when the actual temperature is greater than or equal to a third preset temperature, the main control MCU controls the defrost heater signal to be set to a high level, and the optical coupler (20), the thyristor (30) and the defrost heater (40) are all turned off.

8. The control system according to claim 7, characterized in that: The storage module also stores a second preset temperature, a second time period, a third time period, and a fourth time period; The main control MCU (10) is further configured to: when the actual temperature is greater than the first preset temperature and less than the second preset temperature, the main control MCU (10) controls the defrosting heater to be powered off, and the timing module starts timing at the same time; When the timing module reaches the second time period and restarts the timing, the main control MCU (10) controls the defrost heater to be powered on, and the timing module restarts the timing; When the timing module reaches the third time period, the main control MCU (10) calculates a first total time, where the first total time is the sum of all the second time periods and the third time periods that have passed; When the first total time reaches a fourth time period, the main control MCU (10) reacquires the actual freezing and evaporation temperature detected by the temperature sensor (50); When the first total time does not reach the fourth time period, the main control MCU (10) repeats the above control steps of controlling the defrost heater to be turned off, and the timing module starts timing.

9. The control system according to claim 8, characterized in that: The storage module also stores a fifth time period, a sixth time period and a seventh time period; The main control MCU (10) is further configured to: when the actual temperature is greater than the second preset temperature and less than the third preset temperature, the main control MCU (10) controls the defrost heater to be powered off, and the timing module starts timing at the same time; When the timing module reaches the fifth time period and restarts the timing, the main control MCU (10) controls the defrost heater to be powered on, and the timing module restarts the timing; When the timing module reaches the sixth time period, the main control MCU (10) calculates a second total time, where the second total time is the sum of all the fifth time periods and the sixth time periods that have passed; When the second total time reaches the seventh time period, the main control MCU (10) reacquires the actual freezing and evaporation temperature detected by the temperature sensor (50); When the second total time does not reach the seventh time period, the main control MCU (10) repeats the above control steps of controlling the defrost heater to be turned off and the timing module starts timing.

10. A refrigerator, characterized in that: A control system comprising any one of claims 6 to 9.

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