Intelligent defrosting controller for refrigerator

Abstract

The utility model discloses an intelligent defrosting controller for a refrigerator, which comprises a PCB (Printed Circuit Board) provided with a plurality of ADC (Analog to Digital Converter) interface modules; the display module is connected with the PCB circuit board; the storage battery is integrated on the PCB and is electrically connected with the timing chip; the signal input end of the compressor control unit is electrically connected with the control chip, and the signal output end of the compressor control unit is electrically connected with the compressor; the input end of the signal control unit is connected with the signal output end of the control chip, and the output end of the signal control unit is connected with the temperature control unit; and the signal output end of the sensor unit is electrically connected with the input end of the control chip. The control chip can receive environmental parameters from the sensor unit and accurately control operation of the temperature control unit through PID control according to the parameters, and intelligent management of the refrigerator environment is achieved.

Description

Technical Field

[0001] The utility model relates to the field of control technology, in particular to an intelligent defrosting controller for a refrigerator. Background Art

[0002] For refrigerators equipped with electronic expansion valves, in order to achieve better cooling / heating effects, the opening of the electronic expansion valve is usually controlled based on the target exhaust temperature of the compressor. When the actual exhaust temperature of the compressor is lower than the target exhaust temperature, the opening of the electronic expansion valve is reduced to increase the actual exhaust temperature; conversely, when the actual exhaust temperature of the compressor is higher than the target exhaust temperature, the opening of the electronic expansion valve is increased to reduce the actual exhaust temperature.

[0003] In the prior art, a patent document with application number: CN202311804615.5 discloses a defrost control method for an air conditioner, wherein the air conditioner has a refrigerant heat exchange system consisting of a compressor, a four-way valve, an outdoor heat exchanger and an indoor heat exchanger; an outdoor fan is also arranged at the outdoor heat exchanger; when the outdoor heat exchanger is placed vertically, the coil of the outdoor heat exchanger is divided into a pipeline where the windward side is located and a pipeline where the leeward side is located according to the wind direction when the outdoor fan rotates forward, and a first bypass electronic expansion valve is arranged on the pipeline where the windward side of the coil of the outdoor heat exchanger is located, and a second bypass electronic expansion valve is arranged on the pipeline where the leeward side of the coil of the outdoor heat exchanger is located; the defrost control method for the air conditioner comprises: when the air conditioner is in heating operation, controlling the first bypass electronic expansion valve to be closed, and controlling the second bypass electronic expansion valve to be closed. ; Obtain the temperature of the pipe where the windward side of the coil of the outdoor heat exchanger is located, which is recorded as the first pipe temperature of the outdoor heat exchanger; and obtain the temperature of the pipe where the leeward side of the coil of the outdoor heat exchanger is located, which is recorded as the second pipe temperature of the outdoor heat exchanger; after the air conditioner enters the preset defrost mode, according to the first pipe temperature of the outdoor heat exchanger, combined with the opening and closing of the first bypass electronic expansion valve, and the steering of the outdoor fan, the pipe where the windward side of the coil of the outdoor heat exchanger is located is controlled to be defrosted; after determining that the defrosting of the pipe where the windward side of the coil of the outdoor heat exchanger is completed, according to the second pipe temperature of the outdoor heat exchanger, combined with the opening and closing of the second bypass electronic expansion valve, and the steering of the outdoor fan, the pipe where the leeward side of the coil of the outdoor heat exchanger is controlled to be defrosted; and, after determining that the defrosting of the pipe where the leeward side of the coil of the outdoor heat exchanger is completed, the air conditioner exits the preset defrost mode.

[0004] However, the above control method will have the following problems: in order to achieve the target exhaust temperature, the system controls the flow of the electronic expansion valve to gradually decrease, which leads to faster frost formation on the heat exchanger, causing the electronic expansion valve to be closed smaller and smaller, and more and more frost on the heat exchanger, resulting in a decrease in the heat exchange efficiency of the heat exchanger, affecting the normal operation of the heat exchanger. Therefore, it is necessary to improve such a structure to overcome the above defects. Utility Model Content

[0005] The utility model aims to provide an intelligent defrost controller for a refrigerator, which is used to solve the problem that the existing defrost controller has poor sensitivity, easily causing more and more frost on the heat exchanger, resulting in a decrease in the heat exchange efficiency of the heat exchanger and affecting the normal operation of the heat exchanger.

[0006] The above technical objectives of the utility model are achieved by using the following technical solutions:

[0007] An intelligent defrosting controller for a refrigerator, comprising:

[0008] A control chip, wherein the control chip is integrated on a PCB circuit board and is provided with a plurality of ADC interface modules;

[0009] A display module, which is connected to the control chip and is used to receive and display information or instructions sent by the control chip. An operation button is integrated on the display module, and the internal parameters of the control chip can be displayed and debugged through the operation button;

[0010] A storage battery, which is integrated on the PCB circuit board and electrically connected to the timing chip. The storage battery is used to supply energy to the timing chip when the city power is cut off to prevent the system clock from running incorrectly;

[0011] A compressor control unit, wherein a signal input end of the compressor control unit is electrically connected to the control chip, a signal output end of the compressor control unit is electrically connected to the compressor, and the compressor control unit is used to receive instructions from the control chip and control the operation of the compressor;

[0012] A signal control unit, wherein the input end of the signal control unit is connected to the signal output end of the control chip, the output end of the signal control unit is connected to the temperature control unit, and the signal control unit is used to receive instructions from the control chip and control the operation of the temperature control unit;

[0013] A sensor unit, wherein a signal output end of the sensor unit is electrically connected to an input end of a control chip through an ADC interface module, and the sensor unit is used to obtain the ambient temperature, ambient humidity and ambient color temperature of the refrigerator.

[0014] The utility model is further configured as follows:

[0015] A communication module, wherein a signal input end of the communication module is connected to the control chip, an output end of the communication module is connected to a cloud database, and the cloud database obtains information data of the control chip through the communication module and stores it.

[0016] The utility model is further configured as follows: the signal control unit includes:

[0017] A transistor, wherein the input end of the transistor is connected to the PWM port of the control chip, the output end of the transistor is connected to the temperature control unit, and the transistor is used to receive the output signal of the PWM port of the control chip and control the switch of the temperature control unit;

[0018] After the ADC interface module receives the electrical signal sent back by the temperature sensor, it transmits it back to the control chip. The control chip calculates the difference between the value and the set value, makes an output or disconnection instruction, controls the relay module or transistor module to operate, and controls the temperature adjustment unit to work, thereby achieving the purpose of cooling and stabilizing the temperature in the cabinet.

[0019] The utility model is further configured as follows: the temperature control unit comprises:

[0020] Demisting electric heating, which is used to remove dew on the heat exchanger;

[0021] A defrosting electric heating tube, wherein the defrosting electric heating tube is used to remove frost on the heat exchanger;

[0022] The throttle / shut-off valve is used to control the flow rate of the coolant and thus control the exhaust temperature of the compressor.

[0023] The utility model is further configured as follows: the sensor unit comprises:

[0024] A temperature sensor, wherein the signal output end of the temperature sensor is connected to the control chip, and the temperature sensor is used to obtain the ambient temperature or the pipe temperature and send it to the control chip;

[0025] A temperature and humidity sensor, wherein the signal output end of the temperature and humidity sensor is connected to the control chip, and the temperature and humidity sensor is used to obtain the ambient humidity and send it to the control chip;

[0026] A color temperature sensor, wherein a signal output end of the color temperature sensor is connected to the control chip, and the color temperature sensor is used to obtain the color temperature of the heat exchanger and send it to the control chip.

[0027] The utility model is further configured as follows: the compressor control unit comprises:

[0028] A relay, wherein a signal input end of the relay is connected to a signal output end of the control chip, and the relay is used to receive a control signal from the control chip and perform a switching operation according to the signal, thereby controlling the on and off of the compressor control unit;

[0029] A compressor, wherein a signal input terminal of the compressor is connected to a relay, and the switch of the compressor is controlled by the relay;

[0030] A fan, wherein the input end of the fan is connected to a relay, and the switch of the fan is controlled by the relay;

[0031] The lighting module has an input end connected to a relay, and the switch of the lighting module is controlled by the relay.

[0032] In summary, the utility model has the following beneficial effects:

[0033] 1. Intelligent control: The control chip can receive environmental parameters from the sensor unit and accurately control the operation of the temperature control unit through PID adjustment based on these parameters, thus realizing intelligent management of the refrigerator environment.

[0034] 2. Intelligent defrost function: The defrost color temperature sensor detects the frosting status of the evaporator in real time and can accurately control the start and end timing of defrosting. Compared with the traditional timed defrost control, the addition of the defrost color temperature sensor can reduce the defrosting frequency when the ambient humidity is low, ensuring that the internal environment of the refrigerator is always kept in the best state and avoiding the impact of frost on the performance of the refrigerator.

[0035] 3. Real-time monitoring and feedback: The sensor unit can monitor the ambient temperature, humidity and color temperature in real time, and feed this information back to the control chip, so that the control chip can make timely and accurate adjustments.

[0036] 4. Intelligent defog function: The temperature and humidity sensors detect the temperature and humidity of the glass surface in real time and calculate the dew point temperature. When the surface temperature is close to the dew point temperature, the defog electric heating is turned on at a certain ratio to raise the glass temperature, thereby achieving the purpose of defog. Due to the ability to calculate the dew point in real time, the glass defog may be turned off when the ambient temperature or humidity is low. Compared with the traditional control logic of constant heating of the glass, the energy consumption of defog can be effectively reduced without reducing the glass transparency.

[0037] 5. Remote supervision and control: The communication module transmits the operating status and parameter values ​​of the controller back to the cloud server. In case of abnormality or failure, the operating status of the equipment can be determined by analyzing the cloud data records in the background. If necessary, parameter modification commands can be sent remotely to restore or optimize abnormal parameters and eliminate controller failures, effectively reducing the labor cost of after-sales maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0039] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with illustrations and specific embodiments.

[0040] like Figure 1 As shown, the utility model proposes an intelligent defrost controller for a refrigerator, including a control chip, which is integrated on a PCB circuit board, and the control chip adopts an MCU chip, and a plurality of ADC interface modules are provided on the control chip; a display module, which is installed on the control chip, and the display module is used to receive and display information or instructions sent by the control chip; a display module, which is connected to the control chip, and the display module is used to receive and display information or instructions sent by the control chip, and an operation button is integrated on the display module, and the internal parameters of the control chip can be displayed and debugged through the operation button; a battery, which is integrated on the PCB circuit board and electrically connected to the timing chip, and the battery is used to supply energy to the timing chip when the city power is cut off to prevent the system clock from running incorrectly; a compressor control unit, the signal input end of the compressor control unit is electrically connected to the control chip, the signal output end of the compressor control unit is electrically connected to the compressor, and the compressor control unit is used to receive instructions from the control chip and control the operation of the compressor;

[0041] The signal control unit has an input end connected to the signal output end of the control chip, and an output end connected to the temperature control unit. The signal control unit is used to receive instructions from the control chip and control the operation of the temperature control unit. By receiving instructions from the control chip, the signal control unit can accurately control the operation of the temperature control unit, including the switch and adjustment of the defogger, defrost and throttle / shutoff valves. The environmental parameters and working status of the heat exchanger can be obtained to perform accurate dew and defrost operations, thus avoiding the impact of frost on the performance of the refrigerator;

[0042] The sensor unit, the signal output end of the sensor unit is electrically connected to the input end of the control chip. The sensor unit is used to obtain the ambient temperature, ambient humidity and ambient color temperature of the refrigerator. The data obtained by the sensor unit can accurately determine the working status of the heat exchanger, and feed this information back to the control chip. The control chip formulates corresponding control strategies based on this information, and realizes precise control of the heat exchanger through the signal control unit and the temperature control unit.

[0043] In this embodiment, the defrost control chip also includes a communication module. Preferably, the communication module adopts a 485 communication module. The signal input end of the communication module is connected to the control chip, and the output end of the communication module is connected to the cloud database. The cloud database obtains the information data of the control chip through the communication module. The introduction of the communication module enables the control chip to establish a connection with the cloud database to achieve real-time information interaction and remote monitoring. These data include not only the data collected by sensors such as the ambient temperature, humidity, and color temperature inside the refrigerator, but also the operating status, fault information, and control strategy of the defrost control chip. By transmitting these data to the cloud database in real time, users can understand the operation of the refrigerator anytime and anywhere.

[0044] In this embodiment, the signal control unit includes a PID control circuit, the signal input end of the PID control circuit is connected to the signal output end of the control chip, and the PID control circuit is used to receive the PWM on-off signal generated by the control chip; a transistor, the input end of the transistor is connected to the PID control circuit, the output end of the transistor is connected to the temperature control unit, and the transistor is used to receive the output signal of the PID control circuit and control the switch of the temperature control unit; through the coordinated use of the PID control circuit and the transistor, the defrost control chip can realize the intelligent and refined adjustment of the temperature control unit. Including the control of the defogger electric heating, the defrost electric heating pipe and the throttling / shutoff valve, all can be accurately adjusted according to actual needs to ensure the stability of the internal environment of the refrigerator and the optimization of the refrigeration effect.

[0045] In this embodiment, the temperature control unit includes a defogger, which is used to remove dew on the heat exchanger. The heat exchanger surface of the refrigerator is prone to condensation of dew, which not only affects the heat dissipation effect of the heat exchanger, but also may cause the formation of frost. The defogger heats the surface of the heat exchanger to make the dew evaporate quickly, thereby keeping the heat exchanger clean and running efficiently; a defrosting electric heating pipe, which is used to remove frost on the heat exchanger. When the refrigerator is running for a long time or the ambient temperature is too low, frost may form on the surface of the heat exchanger, which will seriously affect the refrigeration effect of the refrigerator. The defrosting electric heating pipe can quickly heat the surface of the heat exchanger when needed, melt and evaporate the frost, and ensure the normal operation of the heat exchanger; a throttling / shut-off valve, which is used to control the flow of the coolant, and then control the exhaust temperature of the compressor; so that the temperature control unit can flexibly adjust the refrigeration effect according to the ambient temperature and the operating state of the refrigerator, and ensure the stability and uniformity of the temperature inside the refrigerator.

[0046] In this embodiment, the temperature control unit includes a defrosting electric heating pipe, which is used to remove frost on the heat exchanger. The heat exchanger surface of the refrigerator is prone to condensation, which not only affects the heat exchange effect of the heat exchanger, but also may cause the formation of frost. When the refrigerator is operated for a long time or the ambient temperature is too low, frost may form on the heat exchanger surface, which will seriously affect the refrigeration effect of the refrigerator. The defrosting electric heating pipe can quickly heat the heat exchanger surface when needed to melt and evaporate the frost, ensuring the normal operation of the heat exchanger;

[0047] In this embodiment, the temperature control unit includes a defogger, which is used to remove dew on the glass or surface of the display cabinet. The internal temperature of the display cabinet is relatively low, usually lower than the ambient dew point temperature, so the surface of the display cabinet glass is prone to fogging, and then dew is formed, affecting the appearance and glass display effect. The defogger is turned on when necessary to heat the glass surface to make the glass surface temperature higher than the dew point, prevent fog from being generated, and ensure that the glass perspective reaches the best effect;

[0048] In this embodiment, the throttle / stop valve is used to control the flow rate of the coolant, thereby controlling the exhaust temperature of the compressor; enabling the temperature control unit to flexibly adjust the refrigeration effect according to the ambient temperature and the operating status of the refrigerator, thereby ensuring the stability and uniformity of the temperature inside the refrigerator.

[0049] In this embodiment, the sensor unit includes a temperature sensor, the signal output end of the temperature sensor is connected to the control chip, the temperature sensor is used to obtain the ambient temperature and send it to the control chip. When the ambient temperature is lower than a certain threshold, the control chip can intelligently start the defrosting operation according to the data of the temperature sensor to prevent frost from affecting the performance of the refrigerator;

[0050] Temperature and humidity sensor: The signal output end of the temperature and humidity sensor is connected to the control chip. The temperature and humidity sensor is used to obtain the ambient humidity and send it to the control chip. Through the temperature and humidity sensor, the control chip can understand the humidity level of the current environment in real time, so as to more accurately determine whether it is necessary to adjust the operating status of the refrigerator or start the defog operation. When the humidity is too high, the control chip can respond in time and prevent dew from condensing on the glass surface of the display cabinet by adjusting the working status of the temperature control unit;

[0051] Color temperature sensor: The signal output end of the color temperature sensor is connected to the control chip. The color temperature sensor is used to obtain the color temperature of the heat exchanger and send it to the control chip. When the heat exchanger surface is frosted, its color temperature will change. The color temperature sensor can capture this change and send relevant information to the control chip. The control chip can determine whether the heat exchanger needs to be defrosted based on the data of the color temperature sensor, so as to start the defrosting program in time to keep the heat exchanger clean and running efficiently.

[0052] The inconsistent spacing between the color temperature sensor and the evaporator fins can easily lead to a large deviation in the detected value. In order to avoid errors, preferably, during the installation of the sensor, a limit plate can be set on the temperature difference sensor to fix the spacing between the sensor and the fins.

[0053] The existing evaporator fins are generally made of aluminum, which has certain reflective properties, resulting in errors in the obtained color temperature difference. Preferably, the corresponding detection position of the sensor can be sprayed in a dark color, which can effectively increase the color temperature difference before and after frosting.

[0054] In order to prevent the color temperature sensor from being covered by frost or condensation on the probe surface, thereby affecting the sensitivity of the sensor, preferably, a heating plate can be installed at the bottom of the sensor to maintain the surface temperature of the sensor and prevent condensation or frost on the surface.

[0055] In this embodiment, the compressor control unit includes a relay, wherein the signal input end of the relay is connected to the signal output end of the control chip, and the relay is used to receive a control signal from the control chip and perform a switching operation according to the signal, thereby controlling the on and off of the compressor control unit; a compressor, wherein the signal input end of the compressor is connected to the relay, and the switch of the compressor is controlled by the relay; a fan, wherein the input end of the fan is connected to the relay, and the switch of the fan is controlled by the relay; and a lighting module, wherein the input end of the lighting module is connected to the relay, and the switch of the lighting module is controlled by the relay.

[0056] The use process of the utility model is as follows: Step 1: defrosting; the color temperature sensor is installed on the side of the evaporator that is prone to frost, and the control chip analyzes the color temperature data sent back in real time by the color temperature sensor probe, and can analyze the current frost thickness of the evaporator fins, and start defrosting at a suitable color temperature threshold. When the color temperature reaches the set defrost termination threshold, the defrost program is terminated, and refrigeration is restarted, and the cycle is repeated in sequence;

[0057] Step 2: Refrigeration; When the temperature sensor reaches the set temperature, refrigeration stops and enters the PID adjustment state, allowing the electronic expansion valve to continue refrigeration at a certain opening, so that the refrigeration capacity and the cold capacity lost by the refrigerator reach a relative balance. The refrigerator can be maintained near the set temperature, the cabinet temperature fluctuates less, and it is easier to maintain the temperature of the goods;

[0058] Step 3: Demisting: The temperature and humidity sensors detect the temperature and humidity of the glass surface in real time and calculate the dew point temperature. When the surface temperature is close to the dew point temperature, the defogger is turned on at a certain ratio to raise the glass temperature, thereby achieving the purpose of defogger. Due to the ability to calculate the dew point in real time, when the ambient temperature or humidity is low, the glass defogger may be turned off. Compared with the traditional control logic of constant heating of the glass, it can effectively reduce energy consumption.

[0059] The defrosting method in step 1 can be selected as follows:

[0060] Natural defrosting: There is no heating device. The air above 0 degrees inside the freezer circulates continuously to blow off the frost on the evaporator surface.

[0061] Electric defrosting: An electric heating tube is installed near the evaporator. During defrosting, the controller outputs the corresponding port, and the electric heating tube heats and removes the frost on the evaporator.

[0062] Hot gas defrost: Remove frost from the evaporator by introducing the heat from the compressor exhaust gas into the evaporator.

[0063] The principle of the utility model is as follows: the sensor unit obtains the ambient temperature, humidity and color temperature of the refrigerator in real time, and these data are the basis for the subsequent control strategy formulation. The high precision and real-time performance of the sensor unit ensure that the control chip can accurately understand the operating status of the refrigerator.

[0064] The PID control circuit and transistor work together to control the switch of the temperature control unit according to the result of PID calculation. This combination realizes the precise adjustment of the internal environment of the refrigerator. Whether it is the defogger, defrost heater or throttling / shutoff valve, it can be precisely controlled according to actual needs.

[0065] During the whole process, the control chip will continuously monitor the changes in environmental parameters and adjust the control strategy as needed. This cyclic monitoring and adjustment method ensures that the internal environment of the refrigerator is always kept in the best state, improving the operating efficiency and stability of the refrigerator.

[0066] In the description of the present utility model, it should be noted that the terms "upper", "lower", "inner", "outer", "left", "right" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use, or the orientation or positional relationship commonly understood by those skilled in the art, which is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the equipment or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model. In addition, the terms "first", "second" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of the present utility model, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "connection" and the like should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances. In this document, the terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of elements other than those listed and may also include additional elements not expressly listed.

[0067] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. The utility model may have various changes and improvements without departing from the spirit and scope of the utility model. These changes and improvements fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. An intelligent defrost controller for a refrigerator, characterized in that: include, A control chip, wherein the control chip is integrated on a PCB circuit board and is provided with a plurality of ADC interface modules; A display module, which is connected to the control chip and is used to receive and display information or instructions sent by the control chip. An operation button is integrated on the display module, and the internal parameters of the control chip can be displayed and debugged through the operation button; A storage battery, which is integrated on the PCB circuit board and electrically connected to the timing chip. The storage battery is used to supply energy to the timing chip when the city power is cut off to prevent the system clock from running incorrectly; A compressor control unit, wherein a signal input end of the compressor control unit is electrically connected to the control chip, a signal output end of the compressor control unit is electrically connected to the compressor, and the compressor control unit is used to receive instructions from the control chip and control the operation of the compressor; A signal control unit, wherein the input end of the signal control unit is connected to the signal output end of the control chip, the output end of the signal control unit is connected to the temperature control unit, and the signal control unit is used to receive instructions from the control chip and control the operation of the temperature control unit; A sensor unit, wherein a signal output end of the sensor unit is electrically connected to an input end of a control chip through an ADC interface module, and the sensor unit is used to obtain the ambient temperature, ambient humidity and ambient color temperature of the refrigerator.

2. The intelligent defrost controller for a refrigerator according to claim 1, characterized in that: Also includes, A communication module, wherein the signal input end of the communication module is connected to the control chip, and the output end of the communication module is connected to the cloud database signal. The cloud database obtains the information data of the control chip through the communication module and stores it.

3. The intelligent defrost controller for a refrigerator according to claim 1, characterized in that: The signal control unit comprises: A transistor, wherein the input end of the transistor is connected to the PWM port of the control chip, the output end of the transistor is connected to the temperature control unit, and the transistor is used to receive the output signal of the PWM port of the control chip and control the switch of the temperature control unit; After the ADC interface module receives the electrical signal sent back by the temperature sensor, it transmits it back to the control chip. The control chip calculates the difference between the value and the set value, makes an output or disconnection instruction, controls the relay module or transistor module to operate, and controls the temperature adjustment unit to work, thereby achieving the purpose of cooling and stabilizing the temperature in the cabinet.

4. The intelligent defrost controller for a refrigerator according to claim 1, characterized in that: The temperature control unit comprises: Demisting electric heating, which is used to remove dew on the glass or surface of the cabinets; A defrosting electric heating tube, wherein the defrosting electric heating tube is used to remove frost on the heat exchanger; The throttling / shut-off valve is used to control the flow of the coolant and thus control the temperature of the refrigerator.

5. The intelligent defrost controller for a refrigerator according to claim 1, characterized in that: The sensor unit comprises, A temperature sensor, wherein the signal output end of the temperature sensor is connected to the control chip, and the temperature sensor is used to obtain the ambient temperature or the pipe temperature and send it to the control chip; A temperature and humidity sensor, wherein the signal output end of the temperature and humidity sensor is connected to the control chip, and the temperature and humidity sensor is used to obtain the ambient humidity and send it to the control chip; A color temperature sensor, wherein a signal output end of the color temperature sensor is connected to the control chip, and the color temperature sensor is used to obtain the color temperature of the heat exchanger and send it to the control chip.

6. The intelligent defrost controller for a refrigerator according to claim 1, characterized in that: The compressor control unit comprises, A relay, wherein a signal input end of the relay is connected to a signal output end of the control chip, and the relay is used to receive a control signal from the control chip and perform a switching operation according to the signal, thereby controlling the on and off of the compressor control unit; A compressor, wherein a signal input terminal of the compressor is connected to a relay, and the switch of the compressor is controlled by the relay; A fan, wherein the input end of the fan is connected to a relay, and the switch of the fan is controlled by the relay; The lighting module has an input end connected to a relay, and the switch of the lighting module is controlled by the relay.

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