A defrosting control method, control system, and refrigerator for a refrigerator

Abstract

This application provides a refrigerator defrosting control method, control system, and refrigerator, relating to the field of refrigerator defrosting technology. The control system includes a main control MCU, a temperature sensor, and an optocoupler, a thyristor, and a defrosting heater connected in sequence. This application uses the MCU on the control board to receive display commands via UART communication to control the start and stop of the defrosting heater. When the defrosting heater is on, defrosting is performed by detecting the freezing evaporation temperature. This solution features low power consumption, high intelligence, high reliability, no noise, no component lifespan limitation, and a cost no higher than relay solutions. It controls whether to execute the defrosting process according to the display commands, and uses software for segmented control, from initial direct heating to fine-grained start / stop control, resulting in good energy-saving performance.

Description

Technical Field

[0001] This application relates to the field of refrigerator defrosting technology, and in particular to a refrigerator defrosting control method, control system and refrigerator. Background Technology

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

[0003] Frost buildup in a refrigerator refers to the formation of frost or ice crystals in the freezer or refrigerator compartments. This not only affects the refrigerator's cooling efficiency but also increases energy consumption and reduces its lifespan.

[0004] Currently, refrigerator defrosting control uses a relay-driven defrosting heater, which has the disadvantage of the defrosting heater being continuously turned on, resulting in energy waste. Summary of the Invention

[0005] This application provides a refrigerator defrosting control method, control system, and refrigerator. The defrosting heater is turned on and off by the MCU on the electronic control board receiving display and control commands through UART communication. When the defrosting heater is turned on, the defrosting control rules are automatically adjusted by detecting the freezing evaporation temperature to achieve defrosting and energy saving. This solves the problem of energy waste caused by the continuous operation of the defrosting heater in existing refrigerator defrosting methods.

[0006] In a first aspect, embodiments of this application provide a refrigerator defrosting control method, including:

[0007] In response to a command to initiate the defrosting process, the defrosting heater is turned on.

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

[0009] When the actual temperature is lower than the first preset temperature, the defrosting heater will remain on, and the first duration of the defrosting heater being on will be recorded.

[0010] When the first time period is reached, repeat the step of obtaining the actual temperature of freezing and evaporation and comparing it with the preset temperature.

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

[0012] In one feasible implementation, the refrigerator defrosting control method also includes;

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

[0014] Control the defrosting heater to turn off and record the second duration of the shutdown;

[0015] When the second duration reaches the second time period; control the defrosting heater to turn on and maintain the third time period; determine whether the first total time has reached the fourth time period, the first total time being the sum of all the second and third time periods that have passed;

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

[0017] If the first total time does not reach the fourth time period, repeat the steps of controlling the defrost heater to turn off and recording the second duration of the shutdown.

[0018] In one feasible implementation, the refrigerator defrosting control method also includes;

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

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

[0021] When the third duration reaches the fifth time period; control the defrosting heater to turn on and maintain the sixth time period; determine whether the second total time has reached the seventh time period, the second total time being the sum of all the fifth and sixth time periods that have passed;

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

[0023] If the second total time does not reach the seventh time period, repeat the steps of controlling the defrost heater to turn off and recording the third duration of the shutdown.

[0024] In one possible implementation, the second time period is equal to the fifth time period.

[0025] In one feasible implementation, the third time period is longer than the sixth time period.

[0026] Secondly, embodiments of this application provide a control system that executes the aforementioned refrigerator defrosting control method.

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

[0028] The main control MCU is configured to receive a command to start the defrosting process via display control.

[0029] An optocoupler, a thyristor, and a defrost heater are connected in sequence, with the optocoupler being electrically connected to the main control MCU. When the main control MCU controls the defrost heater signal to a low level, the optocoupler, thyristor, and defrost heater are all powered on and operate. When the main control MCU controls the defrost heater signal to a high level, the optocoupler, thyristor, and defrost heater are all powered off and do not operate.

[0030] A temperature sensor, electrically connected to the main control MCU, is configured to detect the actual temperature of the freeze-evaporation process and transmit the data to the main control MCU.

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

[0032] The main control MCU is also 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 a high level, and both the optocoupler thyristor and the defrost heater are turned off.

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

[0034] The main control MCU is also 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 defrosting heater to turn off the power, and at the same time the timing module starts timing;

[0035] When the timing module reaches the second time period and restarts the timing, the main control MCU controls the defrosting heater to be powered on and work, and at the same time the timing module restarts the timing.

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

[0037] When the first total time reaches the fourth time period, the main control MCU will reacquire the actual freezing and evaporation temperature detected by the temperature sensor.

[0038] If the first total time has not reached the fourth time period, the main control MCU repeats the control steps described above, which involve turning off the defrosting heater and simultaneously starting the timing module.

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

[0040] The main control MCU is also 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 turn off the power, and at the same time the timing module starts timing;

[0041] When the timing module reaches the fifth time period and restarts the timing, the main control MCU controls the defrosting heater to be powered on and work, and at the same time the timing module restarts the timing.

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

[0043] When the second total time reaches the seventh time period, the main control MCU will reacquire the actual freezing and evaporation temperature detected by the temperature sensor.

[0044] If the second total time has not reached the seventh time period, the main control MCU repeats the control steps described above, which involve turning off the defrosting heater and simultaneously starting the timing module.

[0045] Thirdly, embodiments of this application provide a refrigerator, including the control system described above.

[0046] This application employs a control board MCU that receives display commands via UART communication to control the start and stop of the defrosting heater. When the defrosting heater is on, defrosting is performed by detecting the freezing and evaporation temperature. This solution features low power consumption, high intelligence, high reliability, no noise, no component lifespan limitations, and a cost no higher than relay solutions. It controls whether to execute the defrosting process based on display commands, using software for segmented control, from initial direct heating to fine-grained start / stop control, resulting in good energy-saving performance.

[0047] The defrosting control device disclosed in this application is a refrigerator silicon controlled rectifier (SCR) electronic control device. This solution has a high degree of intelligence, high reliability, no noise, no device lifespan limit, and significantly reduced power consumption increase during a single defrosting and recovery period, with a cost no higher than that of a relay solution. It controls whether to execute the defrosting process according to the display control command, and performs segmented control through software, from initial continuous heating to fine-grained on / off control, resulting in good energy-saving effect. Attached Figure Description

[0048] Figure 1 This is a flowchart illustrating the refrigerator defrosting control method provided in this application;

[0049] Figure 2 This is a timing diagram of the refrigerator defrosting control method provided in this application;

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

[0051] Explanation of reference numerals in the attached figures:

[0052] 10-Main control MCU; 20-Optical coupler; 30-SCR; 40-Defrosting heater; 50-Temperature sensor. Detailed Implementation

[0053] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of this application.

[0054] Currently, refrigerator defrosting control uses a relay-driven defrosting heater. Disadvantages include: clicking noise when the relay operates, slow switching response, and short lifespan. In contrast, thyristor technology is very mature in China, with surface-mount packaging, diverse specifications, low power consumption, and a price lower than relays of the same specifications. It is noiseless, has no lifespan limit, and has a fast switching response.

[0055] The patent, titled "A Refrigerator Defrosting Device, Control Method, and Refrigerator," primarily discloses a method that utilizes ambient indoor air to assist in defrosting the evaporator when defrosting is required. Compared to ordinary electric defrosting, this method consumes less power and electricity, and does not significantly increase the overall energy consumption of the refrigerator. It solves the problem of high power consumption and increased defrosting volume leading to increased overall energy consumption of the refrigerator.

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

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

[0058] To address the shortcomings of the existing technology, this application provides a highly reliable and intelligent new defrosting control device for refrigerators.

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

[0060] 2. This application utilizes a thyristor-driven AC defrosting heater, which can be rapidly started and stopped via MCU control. Furthermore, different control rules are implemented at different temperature ranges by detecting the freezing and evaporation temperature.

[0061] 3. This application adopts a combination of hardware and software to realize a segmented defrosting method for freezing and evaporation temperature, avoiding the continuous operation of the defrosting heater and the resulting energy waste.

[0062] The following detailed description, in conjunction with the accompanying drawings, illustrates the refrigerator defrosting control method, control system, and specific structure of the refrigerator provided in this application.

[0063] Reference Figures 1-2 As shown, this application provides a refrigerator defrosting control method. Figure 2 In the diagram, the horizontal axis represents time t, and the vertical axis represents the defrost heater filter W. The refrigerator defrost control methods include:

[0064] In response to a command to initiate the defrosting process, the defrosting heater is turned on.

[0065] S1: Obtain the actual temperature of the freeze-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 buttons. Users can input preset temperature and preset time into the main control MCU through the input module. The storage module can be a memory card, and the preset temperature data is stored in the storage module.

[0067] After the main control MCU receives the command to start the defrosting process, it first controls the defrosting heater signal HSXH to 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 can be controlled to conduct. After the defrosting heater Rw1 is energized, it starts heating.

[0068] After the defrosting heater is powered on, the temperature sensor and time module work synchronously. The time module starts timing, the temperature sensor monitors the actual temperature of the freezer evaporator and transmits it to the main control MCU. 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, keep the defrosting heater on and start recording the first duration of the defrosting heater being on.

[0070] When the first time period is reached, repeat the step of obtaining the actual temperature of freezing and 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 turn on to heat the freezer evaporator. In addition, the time module starts to record the first duration of the defrost heater being turned on until the first duration reaches the first time period T1.

[0072] When the first time period T1 is reached, the step of obtaining the actual temperature of the freeze evaporator and comparing it with the preset temperature is repeated. Specifically, the main control MCU monitors the actual temperature of the freeze 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 defrosting heater will 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 evaporator does not need to be heated for defrosting. In this case, the main control MCU controls the evaporator to shut down.

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

[0076] The preset temperature also includes a second preset temperature, where 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 defrosting heater to turn off and record the second duration of the shutdown;

[0078] When the actual temperature is greater than the first preset temperature, it means that the defrosting heater does not need to heat the freezer evaporator at full power. In this case, the main control MCU controls the defrosting heater to power off and shut down. The time module starts recording the second duration from the moment of shutdown.

[0079] S5: When the second duration reaches the second time period; control the defrosting heater to turn on and maintain the third time period; determine whether the first total time has reached the fourth time period, the first total time being the sum of all the second and third time periods that have passed;

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

[0081] If the first total time does not reach the fourth time period, repeat the steps of controlling the defrost heater to turn off and recording the second duration of the shutdown.

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

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

[0084] The main control MCU calculates the first total time, which is the sum of all the elapsed second time intervals T2 and third time intervals T3;

[0085] If the first total time is less than the fourth time period T4, then repeat the process of controlling the defrosting heater to turn off, and record the second duration of the shutdown.

[0086] If the first total time is greater than or equal to the fourth time period T4, then repeat the step of obtaining the actual temperature of freezing and evaporation and comparing it with the preset temperature.

[0087] In some embodiments, the refrigerator defrosting control method further includes;

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

[0089] S6: Control the defrosting heater to turn off and record the third duration of the shutdown;

[0090] When the actual temperature is greater than the second preset temperature, it means that the defrosting heater does not need to heat the freezer evaporator with high power. Then the main control MCU controls the defrosting heater to power off and shut down. The time module starts recording the third duration from the moment of shutdown.

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

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

[0093] If the second total time does not reach the seventh time period, repeat the steps of controlling the defrost heater to turn off and recording the third duration of the shutdown.

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

[0095] When the third duration recorded by the time module reaches the fifth time period T5, the main control MCU controls the defrosting heater to turn on and maintain it for the sixth time period T6.

[0096] The main control MCU calculates the second total time, which is the sum of all the fifth time intervals T5 and the sixth time intervals T6 that have elapsed;

[0097] If the second total time is less than the seventh time period T7, then repeat the process of controlling the defrosting heater to turn off and record the third duration of the shutdown.

[0098] If the second total time is greater than or equal to the seventh time period T7, then repeat the step of obtaining the actual temperature of freezing and evaporation and comparing it with the preset temperature.

[0099] Reference Figure 2 As shown, in some embodiments, the second time period and the fifth time period may have the same or different durations.

[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 in the embodiment of this application, a control system is provided, which executes the above-described refrigerator defrosting control method.

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

[0103] The main control MCU10 is configured to receive a command to start the defrosting process.

[0104] An optocoupler 20, a silicon controlled rectifier 30, and a defrost heater 40 are connected in sequence. The optocoupler 20 is electrically connected to the main control MCU 10. When the main control MCU 10 controls the defrost heater signal to a low level, the optocoupler 20, the silicon controlled rectifier 30, and the defrost heater 40 are all powered on and work. When the main control MCU controls the defrost heater signal to a high level, the optocoupler 20, the silicon controlled rectifier 30, and the defrost heater 40 are all de-powered and do not work.

[0105] Temperature sensor 50, which is electrically connected to the main control MCU 10, is configured to detect the actual temperature of the freeze-evaporation process and transmit the data to the main control MCU 10.

[0106] The main control MCU 10 has a timing module and a storage module. The storage module stores a first preset temperature, a third preset temperature, and a first time period. The main control MCU 10 is configured to: when the actual temperature is lower than the first preset temperature, the main control MCU 10 controls the defrost heater signal to a low level, and the optocoupler 20, the silicon controlled rectifier 30, and the defrost heater 40 are all turned on, while the timing module starts timing; when the timing module reaches the first time period, the main control MCU 10 re-acquires the actual freezing and evaporation temperature detected by the temperature sensor 50.

[0107] The main control MCU 10 is also 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 a high level, and the optocoupler 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 MCU10 is also configured to: when the actual temperature is greater than the first preset temperature and less than the second preset temperature, the main control MCU10 controls the defrost heater to turn off the power, and at the same time the timing module starts timing;

[0110] When the timing module reaches the second time period and restarts the timing, the main control MCU10 controls the defrosting heater to be powered on and work, and at the same time the timing module restarts the timing.

[0111] When the timing module reaches the third time period, the main control MCU10 calculates the first total time, which is the sum of all the second and third time periods that have passed.

[0112] When the first total time reaches the fourth time period, the main control MCU10 re-acquires the actual freezing and evaporation temperature detected by the temperature sensor 50;

[0113] If the first total time has not reached the fourth time period, the main control MCU10 repeats the control steps described above, which involve turning off the defrosting heater and starting the timing module.

[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 MCU10 is also configured to: when the actual temperature is greater than the second preset temperature and less than the third preset temperature, the main control MCU10 controls the defrost heater to turn off the power, and at the same time the timing module starts timing;

[0116] When the timing module reaches the fifth time period and restarts the timing, the main control MCU10 controls the defrosting 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 MCU10 calculates the second total time, which is the sum of all the fifth and sixth time periods that have passed.

[0118] When the second total time reaches the seventh time period, the main control MCU10 re-acquires the actual freezing and evaporation temperature detected by the temperature sensor 50;

[0119] If the second total time has not reached the seventh time period, the main control MCU10 repeats the control steps described above, which involve turning off the defrosting heater and starting the timing module.

[0120] After receiving the command to start the defrosting process, the main control MCU (U1) first sets the defrosting heater signal HSXH to 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. The defrosting heater Rw1 is then energized and begins heating.

[0121] When the main control MCU detects that the freezing evaporation temperature (Rt1) is lower than the first preset temperature, it keeps the defrosting heater on continuously (i.e., during the T1 period) to achieve rapid heating.

[0122] When the detected freezing evaporation temperature is greater than the first preset temperature but less than the second preset temperature, the second stage of defrosting begins. The main control MCU controls the defrost heater signal (HSXH) to be high during time T2 (DI1 set to 1), causing the defrost heater to stop heating. The main control MCU controls the defrost heater signal (HSXH) to be low during time T3 (DI1 set to 0), causing the defrost heater to turn on. This cycle continues (during time T4). The segmented start-stop method avoids high power consumption from continuous operation and also ensures more even heating of the refrigerator walls.

[0123] When the freezing evaporation temperature is greater than the second preset temperature but less than the third preset temperature, the system enters the fine defrosting mode. The main control MCU controls the defrosting heater signal (HSXH) to be high (DI1 set to 1) during time T5, causing the defrosting heater to stop heating. The main control MCU controls the defrosting heater signal (HSXH) to be low (DI1 set to 0) during time T6 (T6 < T3), causing the defrosting heater to start. The system works in cycles (during time T7) for more thorough defrosting and lower energy consumption (the defrosting increment can be reduced by more than 5% compared to the same period last year).

[0124] When the freezing and evaporation temperature is higher than the third preset temperature, the MCU's DI1 port is set to 1, the optocoupler N1 is turned off, the thyristor is turned off, the defrosting heater stops working, and the defrosting process ends.

[0125] This application provides a refrigerator that includes the control system described above.

[0126] It is readily understood that, based on the several embodiments provided in this application, those skilled in the art can combine, split, or reorganize the embodiments of this application to obtain other embodiments, none of which exceed the protection scope of this application.

[0127] The above detailed embodiments further illustrate the purpose, technical solution, and beneficial effects of the embodiments of this application. It should be understood that the above are merely specific embodiments of the embodiments of this application and are not intended to limit the protection scope of the embodiments of this application. Any modifications, equivalent substitutions, improvements, etc., made on the basis of the technical solutions of the embodiments of this application should be included within the protection scope of the embodiments of this application.

Claims

1. A method for controlling defrosting in a refrigerator, characterized in that: include; In response to a command to initiate the defrosting process, the defrosting heater is turned on. Obtain the actual freezing and evaporation temperature and compare it with the preset temperature; When the actual temperature is lower than the first preset temperature, the defrosting heater will remain on, and the first duration of the defrosting heater being on will be recorded. When the first time period is reached, repeat the step of obtaining the actual temperature of freezing and evaporation and comparing it with the preset temperature. When the actual temperature is greater than or equal to the third preset temperature, the defrosting heater is turned off. Refrigerator defrosting control methods also include; When the actual temperature is greater than the first preset temperature and less than the second preset temperature, then: Control the defrosting heater to turn off and record the second duration of the shutdown; When the second duration reaches the second time period; control the defrosting heater to turn on and maintain the third time period; determine whether the first total time has reached the fourth time period, the first total time being the sum of all the second and third time periods that have passed; If the first total time reaches the fourth time period, then repeat the step of obtaining the actual temperature of freezing and evaporation and comparing it with the preset temperature. If the first total time does not reach the fourth time period, repeat the steps of controlling the defrost heater to turn off and recording the second duration of the shutdown. When the actual temperature is greater than the second preset temperature but less than the third preset temperature, then: Control the defrosting heater to turn off and record the third duration of the shutdown; When the third duration reaches the fifth time period; control the defrosting heater to turn on and maintain the sixth time period; determine whether the second total time has reached the seventh time period, the second total time being the sum of all the fifth and sixth time periods that have passed; If the second total time reaches the seventh time period, then repeat the step of obtaining the actual temperature of freezing and evaporation and comparing it with the preset temperature. If the second total time does not reach the seventh time period, repeat the steps of controlling the defrost heater to turn off and recording the third duration of the shutdown.

2. The refrigerator defrosting control method according to claim 1, characterized in that: The second time period is equal to the fifth time period.

3. The refrigerator defrosting control method according to claim 1, characterized in that: The third time period is longer than the sixth time period.

4. A control system applied to a refrigerator, characterized in that: The control system performs the refrigerator defrosting control method according to any one of claims 1-3.

5. The control system according to claim 4, characterized in that: The control system includes; The main control MCU (10) is configured to receive a command to start the defrosting process. An optocoupler (20), a thyristor (30), and a defrost heater (40) are connected in sequence. The optocoupler (20) is electrically connected to the main control MCU (10). When the main control MCU (10) controls the defrost heater signal 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 a high level, the optocoupler (20), the thyristor (30), and the defrost heater (40) are all de-powered and do not work. Temperature sensor (50), the temperature sensor (50) is electrically connected to the main control MCU (10), the temperature sensor (50) is configured to detect the actual temperature of freezing evaporation and transmit it to the main control MCU (10). The main control MCU (10) has a timing module and a storage module. 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 less than the first preset temperature, the main control MCU (10) controls the defrost heater signal to a low level, and the optocoupler (20), the thyristor (30), and the defrost heater (40) are all turned on. At the same time, the timing module starts timing. When the timing module reaches the first time period, the main control MCU (10) re-acquires the actual freezing and evaporation temperature detected by the temperature sensor (50). The main control MCU (10) is also 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 optocoupler (20), thyristor (30), and defrost heater (40) are all turned off.

6. The control system according to claim 5, 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 also 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 power off, and at the same time the timing module starts timing; When the timing module reaches the second time period and restarts the timing, the main control MCU (10) controls the defrosting 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 the first total time, which is the sum of all the second and third time periods that have passed; When the first total time reaches the fourth time period, the main control MCU (10) re-acquires the actual freezing and evaporation temperature detected by the temperature sensor (50); If the first total time has not reached the fourth time period, the main control MCU (10) repeats the above-mentioned control steps of turning off the defrosting heater and starting the timing module.

7. The control system according to claim 6, characterized in that: The storage module also stores the fifth time period, the sixth time period, and the seventh time period; The main control MCU (10) is also 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 defrosting heater to power off, and at the same time the timing module starts timing; When the timing module reaches the fifth time period and restarts the timing, the main control MCU (10) controls the defrosting 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 the second total time, which is the sum of all the fifth and sixth time periods that have passed; When the second total time reaches the seventh time period, the main control MCU (10) re-acquires the actual freezing and evaporation temperature detected by the temperature sensor (50); If the second total time does not reach the seventh time period, the main control MCU (10) repeats the above-mentioned control steps of turning off the defrosting heater and starting the timing module.

8. A refrigerator, characterized in that: Includes the control system described in any one of claims 4-7.

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