Control circuit for a cold freezer

Abstract

The application discloses a control circuit of a cold quick-freezing cabinet, which comprises a power module, a temperature acquisition module, a temperature conversion module, a first main control module and a load driving module. The temperature acquisition module is used for collecting the cabinet temperature and the food temperature in real time. The temperature conversion module is used for converting the cabinet temperature into a cabinet temperature value and converting the food temperature into a food temperature value. The first main control module compares the cabinet temperature value and the food temperature value with preset setting values of the first main control module, and outputs a first quick-freezing stage signal, a second quick-freezing stage signal or a third quick-freezing stage signal. The load driving module is used for driving the cold quick-freezing cabinet to perform corresponding quick-freezing operations. The application can automatically switch different quick-freezing stages according to the changes of the cabinet temperature and the food temperature, so that the cold quick-freezing cabinet can freeze food at a reasonable cooling rate, and the problems, such as that the cabinet temperature reaches the standard, but the food temperature is not frozen to an ideal state, that the food is not sufficiently frozen and that the food is easily deteriorated, can be avoided.

Description

[Technical Field]

[0001] This utility model relates to the field of refrigeration and quick-freezing cabinet technology, and in particular to a control circuit for a refrigeration and quick-freezing cabinet. [Background Technology]

[0002] With the improvement of living standards and changes in consumption habits, people have placed more stringent demands on the preservation and freezing quality of food. Quick-freezing cabinets, which rapidly freeze food to a set temperature to ensure quality and delay spoilage, are key equipment for food storage, and their performance directly affects the taste, nutritional value, and safety of food. Traditional quick-freezing cabinet control logic typically relies on detecting the air temperature inside the cabinet (i.e., ambient temperature) to start and stop the compressor. While this method is simple, it has significant drawbacks: due to the thermal inertia of food, its internal temperature decreases much slower than the ambient temperature inside the cabinet. This results in the cabinet temperature reaching the set value, but the food temperature not being frozen to the ideal state, easily leading to problems such as insufficient freezing, damage to cell structure by ice crystals, and quality degradation.

[0003] Existing solutions include food temperature monitoring, but most only use it as a signal to determine when freezing is complete. They fail to achieve multi-parameter coordination and segmented optimization control of cabinet temperature and food temperature in the dynamic adjustment of the entire quick-freezing process, resulting in a large amount of unnecessary energy waste and reduced energy utilization efficiency. [Utility Model Content]

[0004] To solve the above-mentioned technical problems, this utility model provides a control circuit for a quick-freezing cabinet.

[0005] To achieve the above objectives, this utility model is implemented by the following technical solution:

[0006] A control circuit for a refrigerated freezer includes:

[0007] A power module, the input terminal of which is connected to the mains power supply, is used to provide a stable operating voltage for the control circuit;

[0008] A temperature acquisition module, wherein the power supply terminal of the temperature acquisition module is connected to the output terminal of the power supply module, and the temperature acquisition module is used to acquire the cabinet temperature and food temperature in real time.

[0009] A temperature conversion module is provided, wherein the input end of the temperature conversion module is connected to the output end of the temperature acquisition module, and the temperature conversion module is used to convert the real-time acquired cabinet temperature into a cabinet temperature value. The temperature conversion module is also used to convert the real-time acquired food temperature into a food temperature value.

[0010] The first main control module has its control signal input terminal connected to the output terminal of the temperature conversion module. The first main control module outputs a first quick-freezing stage signal if the cabinet temperature value is greater than a first preset refrigeration and quick-freezing temperature value. When the food temperature value reaches the first preset food refrigeration and quick-freezing temperature value and the cabinet temperature value is greater than a second preset refrigeration and quick-freezing temperature value, the first main control module outputs a second quick-freezing stage signal. When the food temperature value reaches the second preset food refrigeration and quick-freezing temperature value and the cabinet temperature value is greater than a third preset refrigeration and quick-freezing temperature value, the first main control module outputs a third quick-freezing stage signal.

[0011] The load drive module has its input terminal connected to the control signal output terminal of the first main control module. The load drive module is used to drive the refrigerated freezer to perform the corresponding quick-freezing operation when it receives the first quick-freezing stage signal, the second quick-freezing stage signal, or the third quick-freezing stage signal.

[0012] By adopting the above technical solution, the first main control module can monitor the cabinet temperature and the food temperature stored in the blast freezer in real time through the temperature acquisition module. It automatically switches between different blast freezing stages based on changes in both the cabinet and food temperatures, enabling the blast freezer to freeze food at a reasonable cooling rate. This avoids problems such as insufficient freezing and spoilage when the cabinet temperature meets the standard but the food temperature is not yet ideal. Secondly, because the blast freezer dynamically adjusts its operating status based on the actual cabinet and food temperatures, and performs targeted control by dividing the blast freezing into different stages, it avoids unnecessary energy waste compared to traditional continuous high-intensity refrigeration equipment, effectively reducing energy consumption and improving energy efficiency, while also helping to maintain food quality.

[0013] The control circuit for a quick-freezing cabinet as described above, wherein the power supply module includes:

[0014] A rectifier unit, the input terminal of which is connected to the mains power supply, is used to convert the mains power supply into DC power supply;

[0015] The first step-down unit has its input terminal connected to the output terminal of the rectifier unit. The first step-down unit is used to step down the DC power supply to a first DC voltage.

[0016] The second step-down unit has its input terminal connected to the output terminal of the first step-down unit, and is used to step down the first DC voltage to a second DC voltage.

[0017] The control circuit for a quick-freezing cabinet as described above includes a temperature acquisition module comprising:

[0018] The cabinet temperature acquisition unit has its input terminal electrically connected to the cabinet temperature probe and its output terminal connected to the cabinet temperature signal input terminal of the temperature conversion module. The cabinet temperature acquisition unit is used to acquire the current cabinet temperature of the refrigerated freezer in real time.

[0019] The food temperature acquisition unit has an input terminal electrically connected to a temperature sensing probe and an output terminal connected to the food temperature signal input terminal of the temperature conversion module. The food temperature acquisition unit is used to acquire the current temperature of the food in real time.

[0020] As described above, the control circuit for a refrigerated freezer includes a cabinet temperature acquisition unit comprising a cabinet temperature probe interface J3, a capacitor C3, a resistor R2, and a resistor R3. The signal output terminal of the cabinet temperature probe interface J1 is connected to one end of the capacitor C3, the other end of the capacitor C3 is connected to one end of the resistor R3, and the other end of the resistor R3 is connected to the cabinet temperature signal input terminal of the temperature conversion module. The resistor R2 is connected between the grounding terminal of the cabinet temperature probe interface J1 and ground.

[0021] As described above, the control circuit of a quick-freezing cabinet includes a food temperature acquisition unit comprising a temperature probe interface J4, a capacitor C27, a resistor R7, and a resistor R29. The signal output terminal of the temperature probe interface J4 is connected to one end of the capacitor C27, the other end of the capacitor C27 is connected to one end of the resistor R29, and the other end of the resistor R29 is connected to the food temperature signal input terminal of the temperature conversion module. The resistor R7 is connected between the ground terminal of the temperature probe interface J4 and ground.

[0022] As described above, in the control circuit of a quick-freezing cabinet, the temperature conversion module includes a temperature conversion chip U2. The cabinet temperature signal input terminal of the temperature conversion chip U2 is connected to the output terminal of the cabinet temperature acquisition unit, the food temperature signal input terminal of the temperature conversion chip U2 is connected to the output terminal of the food temperature acquisition unit, and the output terminal of the temperature conversion chip U2 is connected to the control signal input terminal of the first main control module.

[0023] As described above, in the control circuit of a blast freezer, the load drive module includes:

[0024] A drive unit, the input terminal of which is connected to the control signal output terminal of the first main control module, is used to output a drive signal when it receives the first quick-freezing stage signal, the second quick-freezing stage signal, or the third quick-freezing stage signal.

[0025] A load unit, the input of which is connected to the output of the drive unit, is used to drive the blast freezer to perform a corresponding blast freezer operation when it receives the drive signal.

[0026] As described above, in the control circuit of a refrigeration and quick-freezing cabinet, the load unit includes a relay RE1, the first output terminal of the drive unit is connected to the first coil terminal of the relay RE1, the output terminal of the rectifier unit is connected to the second coil terminal of the relay RE1, the common terminal of the relay RE1 is connected to the live wire terminal of the mains power supply, and the normally open terminal of the relay RE1 is electrically connected to the compressor.

[0027] The control circuit of the blast freezer described above also includes:

[0028] A function mode selection module is used to select the function mode of the refrigeration and quick-freezing cabinet and output a function mode selection signal.

[0029] The second main control module has its mode selection terminal connected to the signal output terminal of the function mode selection module. The second main control module is used to output a mode switching signal when it receives the function mode selection signal.

[0030] The communication module has a communication signal terminal connected to the communication signal terminal of the second main control module, and a communication control terminal electrically connected to the blast freezer. The communication module is used to control the blast freezer to execute the corresponding functional mode when it receives the mode switching signal.

[0031] As described above, in the control circuit of a refrigerated freezer, the communication module includes a communication chip U7 and a communication interface J2. The communication signal terminal of the second main control module is connected to the communication signal terminal of the communication chip U7, and the communication control terminal of the communication chip U7 is connected to the input terminal of the communication interface J2.

[0032] Compared with the prior art, the control circuit of the refrigerated freezer proposed in this utility model has the following advantages:

[0033] Beneficial effects:

[0034] 1. The control circuit proposed in this utility model has a first main control module that can monitor the cabinet temperature and the food temperature stored in the freezer in real time through the temperature acquisition module. It can automatically switch between different quick-freezing stages according to the changes in cabinet temperature and food temperature, so that the freezer can freeze the food at a reasonable cooling rate. This avoids problems such as insufficient freezing and easy spoilage of food when the cabinet temperature reaches the standard but the food temperature is not frozen to the ideal state. [Attached Image Description]

[0035] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0036] Figure 1 This is a block diagram illustrating the circuit principle structure of this utility model;

[0037] Figure 2 This is another circuit principle structure block diagram of this utility model;

[0038] Figure 3 This is a circuit diagram of the power module of this utility model;

[0039] Figure 4 This is a partial circuit diagram of the temperature acquisition module and temperature conversion module of this utility model;

[0040] Figure 5 This is a circuit diagram of the first main control module of this utility model;

[0041] Figure 6 This is a schematic diagram of the driving unit part of this utility model.

[0042] Figure 7 This is a circuit diagram of the load unit part of this utility model.

[0043] Figure 8 This is a circuit diagram of the function mode selection module of this utility model.

[0044] Figure 9 This is a circuit diagram of the second main control module of this utility model.

[0045] Figure 10 This is a schematic diagram of the communication chip part of this utility model.

[0046] Figure 11 This is a circuit schematic diagram of the communication interface part of this utility model;

[0047] Figure 12 This is a circuit diagram of the alarm notification module of this utility model;

[0048] Figure 13 This is a circuit diagram of the display module of this utility model.

Detailed Implementation Methods

[0049] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0050] Specific embodiments, combined with Figures 1 to 13 As shown, further illustrating the technical solution of this utility model, a control circuit for a quick-freezing cabinet includes a power supply module 100, a temperature acquisition module 200, a temperature conversion module 300, a first main control module 400, and a load drive module 500. The input terminal of the power supply module 100 is connected to the mains power supply, and the power supply module 100 provides a stable operating voltage for the control circuit. The power supply terminal of the temperature acquisition module 200 is connected to the output terminal of the power supply module 100, and the temperature acquisition module 200 is used to acquire the cabinet temperature and food temperature in real time. The input terminal of the temperature conversion module 300 is connected to the output terminal of the temperature acquisition module 200, and the temperature conversion module 300 is used to convert the real-time acquired cabinet temperature into a cabinet temperature value. The temperature conversion module 300 is also used to convert the real-time acquired food temperature into a food temperature value. The first main control module... The control signal input terminal of the first main control module 400 is connected to the output terminal of the temperature conversion module 300. The first main control module 400 outputs a first quick-freezing stage signal if the cabinet temperature value is greater than the first preset quick-freezing temperature value. When the food temperature value reaches the first preset food quick-freezing temperature value and the cabinet temperature value is greater than the second preset quick-freezing temperature value, it outputs a second quick-freezing stage signal. When the food temperature value reaches the second preset food quick-freezing temperature value and the cabinet temperature value is greater than the third preset quick-freezing temperature value, it outputs a third quick-freezing stage signal. The input terminal of the load drive module 500 is connected to the control signal output terminal of the first main control module 400. The load drive module 500 is used to drive the quick-freezing cabinet to perform the corresponding quick-freezing operation when it receives the first quick-freezing stage signal, the second quick-freezing stage signal, or the third quick-freezing stage signal.

[0051] In this embodiment, the first main control module can monitor the cabinet temperature and the food temperature stored inside the blast freezer in real time through the temperature acquisition module. It automatically switches between different blast freezing stages based on changes in both the cabinet and food temperatures, ensuring the blast freezer freezes food at a reasonable cooling rate. This avoids situations where the cabinet temperature meets the standard, but the food temperature is not yet ideal, leading to insufficient freezing and spoilage. Secondly, because the blast freezer dynamically adjusts its operation based on the actual cabinet and food temperatures, and performs targeted control by dividing the blast freezing process into different stages, it avoids unnecessary energy waste compared to traditional continuous high-intensity refrigeration equipment, effectively reducing energy consumption and improving energy efficiency, while also helping to maintain food quality.

[0052] Furthermore, as a preferred embodiment of this solution and not a limitation thereof, the power module 100 includes a rectifier unit 110, a first buck unit 120, and a second buck unit 130. The input terminal of the rectifier unit 110 is connected to the mains power supply, and the rectifier unit 110 is used to convert the mains power supply into DC power. The input terminal of the first buck unit 120 is connected to the output terminal of the rectifier unit 110, and the first buck unit 120 is used to step down the DC power supply to a first DC voltage. The input terminal of the second buck unit 130 is connected to the output terminal of the first buck unit 120, and the second buck unit 130 is used to step down the first DC voltage to a second DC voltage.

[0053] The mains power supply outputs a 12V DC voltage after being rectified and converted by the rectifier unit 110. The first DC voltage output after the 12V DC voltage is stepped down by the first step-down unit 120 is a 5V DC voltage. The second DC voltage output after the 5V DC voltage is stepped down by the second step-down unit 130 is a 1.2V DC voltage.

[0054] In a preferred embodiment, the rectifier unit 110 includes a transformer T1 and a rectifier bridge DB1. The live wire (L terminal) of the mains power supply is connected to the first input terminal (pin 2) of the primary winding of the transformer T1, the neutral wire (N terminal) of the mains power supply is connected to the second input terminal (pin 1) of the primary winding of the transformer T1, the first output terminal (pin 3) of the secondary winding of the transformer T1 is connected to the first AC input terminal (AC1 terminal) of the rectifier bridge DB1, the second output terminal (pin 4) of the secondary winding of the transformer T1 is connected to the second AC input terminal (AC2 terminal) of the rectifier bridge DB1, the negative output terminal of the rectifier bridge DB1 is grounded, and the positive output terminal of the rectifier bridge DB1 is connected to the input terminal of the first step-down unit 120.

[0055] Alternatively, the rectifier bridge DB1 is preferably model DB2075.

[0056] In this embodiment, transformer T1 first steps down the mains power supply (220V AC) to 12V AC, and rectifier bridge DB1 then rectifies the 12V AC to 12V DC. Through transformer T1, the mains power supply on the high-voltage side is isolated from the rectifier bridge DB1 on the low-voltage side, thereby preventing the transient high voltage of the mains power supply from directly impacting the rectifier bridge and other subsequent circuits, thus avoiding safety accidents such as circuit component breakdown or burnout.

[0057] In a preferred embodiment, the first step-down unit 120 includes a linear regulator U6. The output terminal of the rectifier unit 110 is connected to the input terminal (i.e., VIN terminal) of the linear regulator U6. The ground terminal (i.e., GND terminal) of the linear regulator U6 is grounded. The output terminal (i.e., VOUT terminal) of the linear regulator U6 is connected to the input terminal of the second step-down unit 130.

[0058] Alternatively, the linear regulator U6 is preferably model L78M05.

[0059] In a preferred embodiment, the second step-down unit 130 includes a linear regulator U7. The output terminal of the first step-down unit 120 is connected to the input terminal (i.e., VIN terminal) of the linear regulator U7. The ground terminal (i.e., GND terminal) of the linear regulator U7 is grounded. The output terminal (i.e., VOUT terminal) of the linear regulator U7 outputs a second DC voltage.

[0060] Alternatively, the linear regulator U7 is preferably model AMS1117-1.2.

[0061] In this embodiment, linear regulators U6 and U7 are used to step down the input 12V DC voltage to 5V DC voltage and 1.2V DC voltage in stages, providing a stable and suitable driving power for other subsequent circuit modules. Secondly, through the voltage regulation function of the linear regulators, the output DC voltage ripple is small and the stability is high, which can effectively suppress the impact of voltage fluctuations on other subsequent circuit modules and avoid errors such as inaccurate temperature acquisition caused by voltage fluctuations.

[0062] Furthermore, as a preferred embodiment of this solution and not a limitation, the temperature acquisition module 200 includes a cabinet temperature acquisition unit 210 and a food temperature acquisition unit 220. The input terminal of the cabinet temperature acquisition unit 210 is electrically connected to a cabinet temperature probe, and the output terminal of the cabinet temperature acquisition unit 210 is connected to the cabinet temperature signal input terminal of the temperature conversion module 300. The cabinet temperature acquisition unit 210 is used to acquire the current cabinet temperature of the freezer in real time. The input terminal of the food temperature acquisition unit 220 is electrically connected to a temperature sensing probe, and the output terminal of the food temperature acquisition unit 220 is connected to the food temperature signal input terminal of the temperature conversion module 300. The food temperature acquisition unit 220 is used to acquire the current temperature of the food in real time.

[0063] In a preferred embodiment, the cabinet temperature acquisition unit 210 includes a cabinet temperature probe interface J3, a capacitor C3, a resistor R2, and a resistor R3. The signal output terminal (i.e., pin 1) of the cabinet temperature probe interface J1 is connected to one end of the capacitor C3, the other end of the capacitor C3 is connected to one end of the resistor R3, and the other end of the resistor R3 is connected to the cabinet temperature signal input terminal (i.e., PT2 terminal) of the temperature conversion module 300. The ground terminal (i.e., pin 2) of the cabinet temperature probe interface J1 is connected to ground via the resistor R2.

[0064] Specifically, the cabinet temperature probe interface J3 is connected to an external cabinet temperature probe, which is preferably an NTC thermistor probe. When the temperature inside the freezer changes, the resistance value of the cabinet temperature probe will change accordingly, thereby outputting a corresponding temperature change signal. The grounding terminal (pin 2) of the cabinet temperature probe interface J1 is grounded through resistor R2, forming a voltage divider circuit with the external cabinet temperature probe, which converts the output temperature change signal into a corresponding voltage signal. Capacitor C3 and resistor R3 serve as an RC filter circuit, which can filter out high-frequency interference in the voltage signal, making the signal transmission smoother and more stable.

[0065] In a preferred embodiment, the food temperature acquisition unit 220 includes a temperature probe interface J4, a capacitor C27, a resistor R7, and a resistor R29. The signal output terminal (i.e., pin 1) of the temperature probe interface J4 is connected to one end of the capacitor C27, the other end of the capacitor C27 is connected to one end of the resistor R29, and the other end of the resistor R29 is connected to the food temperature signal input terminal (i.e., PT1 terminal) of the temperature conversion module 300. The ground terminal (i.e., pin 2) of the temperature probe interface J4 is connected to ground via the resistor R7.

[0066] Specifically, a temperature sensor is connected to the temperature sensor interface J4. The temperature sensor is preferably an NTC thermistor probe. When the temperature of the food inside the freezer changes, the resistance value of the temperature sensor will change accordingly, thereby outputting a corresponding temperature change signal. The ground terminal (pin 2) of the temperature sensor interface J4 is grounded through resistor R7, forming a voltage divider circuit with the external temperature sensor to convert the output temperature change signal into a corresponding voltage signal. Capacitor C27 and resistor R29 serve as an RC filter circuit, which can filter out high-frequency interference in the voltage signal, making the signal transmission smoother and more stable.

[0067] Furthermore, as a preferred embodiment of this solution and not a limitation thereof, the temperature conversion module 300 includes a temperature conversion chip U2. The cabinet temperature signal input terminal (PT2 terminal) of the temperature conversion chip U2 is connected to the output terminal of the cabinet temperature acquisition unit 210, the food temperature signal input terminal (PT1 terminal) of the temperature conversion chip U2 is connected to the output terminal of the food temperature acquisition unit 220, and the output terminal (i.e., SCL terminal and SDA terminal) of the temperature conversion chip U2 is connected to the control signal input terminal of the first main control module 400.

[0068] Alternatively, the temperature conversion chip U2 is preferably model BH66F5242.

[0069] In this embodiment, the temperature conversion chip U2 integrates an A / D converter, which can convert the analog voltage signal output by the temperature acquisition module into a digital temperature value. This allows the first main control module to directly read the current temperature inside the freezer and the current temperature of the food inside through the temperature conversion chip U2. As a result, the first main control module can switch between different quick-freezing stages more quickly according to the actual temperature changes, thereby improving the quick-freezing quality of the food and avoiding problems such as insufficient freezing and easy spoilage of the food when the freezer temperature meets the standard but the food temperature does not reach the set value.

[0070] Furthermore, as a preferred embodiment of this solution and not a limitation, the first main control module 400 includes a first main control chip U1, and the model of the first main control chip U1 is preferably HT66F3195.

[0071] Furthermore, as a preferred embodiment of this solution and not a limitation thereof, the load drive module 500 includes a drive unit 510 and a load unit 520. The input terminal of the drive unit 510 is connected to the control signal output terminal of the first main control module 400. The drive unit 510 is used to output a drive signal when it receives the first quick-freezing stage signal, the second quick-freezing stage signal, or the third quick-freezing stage signal. The input terminal of the load unit 520 is connected to the output terminal of the drive unit 510. The load unit 520 is used to drive the quick-freezing cabinet to perform the corresponding quick-freezing operation when it receives the drive signal.

[0072] In a preferred embodiment, the driving unit 510 includes a driving chip U3, preferably a ULN2003A.

[0073] As a preferred embodiment, please refer to the accompanying drawings. Figure 7As shown, the load unit 520 includes at least a relay RE1. The first output terminal (i.e., OUT1 terminal) of the drive unit 510 is connected to the first coil terminal (i.e., pin 2) of the relay RE1. The output terminal (i.e., +12V terminal) of the rectifier unit 110 is connected to the second coil terminal (i.e., pin 1) of the relay RE1. The common terminal (i.e., pin 3) of the relay RE1 is connected to the live wire terminal of the mains power supply. The normally open terminal (i.e., pin 4) of the relay RE1 is electrically connected to the compressor.

[0074] Specifically, the temperature conversion module 300 converts the current cabinet temperature signal and the current food temperature signal collected by the temperature acquisition module 200 into cabinet temperature value and food temperature value, respectively, and transmits them to the first main control module 400. After receiving the cabinet temperature value and food temperature value, the first main control module 400 first compares them with the first preset refrigeration and quick-freezing temperature value of the first main control module 400. If the current cabinet temperature value of the quick-freezing cabinet is greater than the first preset refrigeration and quick-freezing temperature value, the control signal output terminal of the first main control module 400 outputs the first quick-freezing stage signal to the drive unit 510. After receiving the first quick-freezing stage signal, the first output terminal (OUT1 terminal) of the drive unit 510 outputs a drive signal to control the compressor to start running, so that the compressor begins to perform the refrigeration operation of the first quick-freezing stage.

[0075] During the execution of the first quick-freezing stage, if the current temperature value of the quick-freezing cabinet is less than the first preset quick-freezing stage setting value, the control signal output terminal of the first main control module 400 outputs a first quick-freezing stage stop signal to the drive unit 510. After receiving the first quick-freezing stage stop signal, the drive unit 510 outputs a stop signal at its first output terminal to control the compressor to stop running, thereby ending the first quick-freezing stage.

[0076] After the first quick-freezing stage ends, when the food temperature inside the quick-freezing cabinet reaches the first preset food refrigeration and quick-freezing temperature value, and the current cabinet temperature value of the quick-freezing cabinet rises back to a value greater than the second preset refrigeration and quick-freezing temperature value, the control signal output terminal of the first main control module 400 outputs a second quick-freezing stage signal to the drive unit 510. After receiving the second quick-freezing stage signal, the drive unit 510 outputs a drive signal at its first output terminal to control the compressor to start running, so that the compressor begins to perform the refrigeration operation of the second quick-freezing stage.

[0077] During the second quick-freezing stage, if the current temperature of the quick-freezing cabinet is less than the second preset quick-freezing stage setting value, the control signal output terminal of the first main control module 400 outputs a second quick-freezing stage stop signal to the drive unit 510. After receiving the second quick-freezing stage stop signal, the first output terminal of the drive unit 510 outputs a stop signal to control the compressor to stop running, thereby ending the second quick-freezing stage.

[0078] After the second quick-freezing stage ends, when the food temperature inside the quick-freezing cabinet reaches the second preset food refrigeration and quick-freezing temperature value, and the current cabinet temperature value of the quick-freezing cabinet rises back to a value greater than the third preset refrigeration and quick-freezing temperature value, the control signal output terminal of the first main control module 400 outputs a third quick-freezing stage signal to the drive unit 510. After receiving the third quick-freezing stage signal, the drive unit 510 outputs a drive signal at its first output terminal to control the compressor to start running, so that the compressor begins to perform the refrigeration operation of the third quick-freezing stage.

[0079] During the execution of the third quick-freezing stage, if the current temperature of the quick-freezing cabinet is lower than the third preset quick-freezing stage setting value, the control signal output terminal of the first main control module 400 outputs a third quick-freezing stage stop signal to the drive unit 510. After receiving the third quick-freezing stage stop signal, the drive unit 510 outputs a stop signal at its first output terminal to control the compressor to stop running, thereby ending the third quick-freezing stage. When the food temperature inside the quick-freezing cabinet reaches the third preset food refrigeration and quick-freezing temperature value, the quick-freezing mode is exited.

[0080] It should be noted that the first preset quick-freezing temperature value is set as the first preset quick-freezing stage setting value plus the quick-freezing temperature hysteresis; the second preset quick-freezing temperature value is set as the second preset quick-freezing stage setting value plus the quick-freezing temperature hysteresis; and the third preset quick-freezing temperature value is set as the third preset quick-freezing stage setting value. The specific settings of the first, second, and third preset quick-freezing stage settings are set by the user according to actual needs. In this embodiment, the specific temperature settings are not specifically limited.

[0081] Furthermore, the specific settings for the first, second, and third preset food refrigeration and quick-freezing temperatures are also set by the user according to actual needs. In this embodiment, no specific limitations are made on the specific temperature settings.

[0082] In this embodiment, the load drive module controls the start and stop of the compressor according to the control signal of the first main control module, so as to automatically switch between different quick-freezing stages. This allows the quick-freezing cabinet to freeze food at a reasonable cooling rate, avoiding problems such as insufficient freezing and easy spoilage of food when the cabinet temperature reaches the standard but the food temperature is not yet frozen to the ideal state. Secondly, the use of relays to control the compressor provides electrical isolation between the load end and the control end, effectively avoiding interference and damage to the control circuit by the high voltage and high current load circuit, thereby improving the safety and stability of the entire circuit system.

[0083] Furthermore, as a preferred embodiment of this solution and not a limitation, it also includes a function mode selection module 600, a second main control module 700, and a communication module 800. The function selection module 600 is used to select the function mode of the blast freezer and output a function mode selection signal. The mode selection terminal (KEY1-KEY11) of the second main control module 700 is connected to the signal output terminal of the function selection module 600. When the second main control module 700 receives the function mode selection signal, it outputs a mode switching signal. The communication signal terminal of the communication module 800 is connected to the communication signal terminal of the second main control module 700. The communication control terminal of the communication module 800 is electrically connected to the blast freezer. When the communication module 800 receives the mode switching signal, it controls the blast freezer to execute the corresponding function mode.

[0084] As a preferred embodiment, please refer to the accompanying drawings. Figure 8 As shown, the function mode selection module 600 includes at least a soft freeze button KEY1, a refrigerator button KEY5, a freeze button KEY6, resistors R4, R9, and R10. The ground terminal (i.e., pin 1) of the soft freeze button KEY1 is grounded. The signal output terminal (i.e., pin 2) of the soft freeze button KEY1 is connected to one end of the resistor R4. The other end of the resistor R4 is connected to the first mode selection terminal (i.e., KEY1 terminal) of the second main control module 700. The other end of the resistor R4 is also connected to the indicator light input terminal (i.e., pin 3) of the soft freeze button KEY1. The indicator light output terminal (i.e., pin 4) of the soft freeze button KEY1 is connected to the indicator light common terminal (i.e., LED_COM terminal) of the second main control module 700.

[0085] The ground terminal (pin 1) of the refrigerator button KEY5 is grounded. The signal output terminal (pin 2) of the refrigerator button KEY5 is connected to one end of the resistor R9. The other end of the resistor R9 is connected to the second mode selection terminal (KEY5 terminal) of the second main control module 700. The other end of the resistor R9 is also connected to the indicator light input terminal (pin 3) of the refrigerator button KEY5. The indicator light output terminal (pin 4) of the refrigerator button KEY5 is connected to the indicator light common terminal (LED_COM terminal) of the second main control module 700.

[0086] The ground terminal (pin 1) of the freeze button KEY6 is grounded. The signal output terminal (pin 2) of the freeze button KEY6 is connected to one end of the resistor R10. The other end of the resistor R10 is connected to the third mode selection terminal (KEY6 terminal) of the second main control module 700. The other end of the resistor R10 is also connected to the indicator light input terminal (pin 3) of the freeze button KEY6. The indicator light output terminal (pin 4) of the freeze button KEY6 is connected to the indicator light common terminal (LED_COM terminal) of the second main control module 700.

[0087] In this embodiment, users can switch between the function modes of the quick-freeze cabinet by pressing function buttons such as the soft-freeze button KEY1, the refrigerator button KEY5, and the freezer button KEY6, which is simple to operate. At the same time, after the user presses a function button, the corresponding indicator light will light up, so that the user can intuitively confirm the current function mode, avoid the situation of accidental operation without noticing, and improve the certainty of the user's operation.

[0088] In a preferred embodiment, the second main control module 700 includes a second main control chip U5, and the model of the second main control chip U5 is preferably HT66F3195.

[0089] In a preferred embodiment, the communication module 800 includes a communication chip U7 and a communication interface J2. The communication signal terminals (i.e., RE / DE terminals, DI terminals, and RO terminals) of the second main control module 700 are connected to the communication signal terminals of the communication chip U7, and the communication control terminals (i.e., 485-B-DAT terminals and 485-A terminals) of the communication chip U7 are connected to the input terminals (i.e., pin 1 and pin 2) of the communication interface J2.

[0090] The communication interface J2 is located on the blast freezer to enable communication between the blast freezer and the communication module 800.

[0091] Alternatively, the preferred model of the communication chip U7 is MAX485E.

[0092] In this embodiment, when the user presses a function button, a corresponding function mode selection signal is transmitted to the second main control module. The second main control module outputs a mode switching signal based on the received function mode selection signal. After receiving the mode switching signal, the communication chip controls the refrigeration cabinet to execute the corresponding function mode through the communication interface.

[0093] Furthermore, as a preferred embodiment of this solution and not a limitation, it also includes an alarm notification module 900, the alarm notification terminal of which is connected to the alarm notification terminal of the second main control module 700, and the alarm notification module 900 is used to notify the user when the refrigeration cabinet malfunctions.

[0094] In a preferred embodiment, the alarm prompting module 900 includes a buzzer BZ1, a transistor Q1, and a resistor R13. The alarm prompting terminal (i.e., BUZ terminal) of the second main control module 700 is connected to one end of the resistor R13, the other end of the resistor R13 is connected to the base of the transistor Q1, the emitter of the transistor Q1 is grounded, the collector of the transistor Q1 is connected to the alarm prompting terminal (i.e., pin 2) of the buzzer BZ1, and the power supply terminal (i.e., pin 1) of the buzzer BZ1 is connected to the output terminal (i.e., +5V) of the first step-down unit 120.

[0095] In this embodiment, the quick-freezing cabinet is equipped with an alarm notification mechanism. When the equipment malfunctions (such as excessively high cabinet temperature or compressor overload), it will emit a buzzer to alert the user. This allows the user to promptly investigate the cause of the equipment malfunction and avoid prolonged malfunction that could lead to spoilage of stored food or even damage or burnout of the equipment.

[0096] Furthermore, as a preferred embodiment of this solution and not a limitation, it also includes a display module 1000, the display signal terminal of which is connected to the display signal terminal of the second main control module 700, and the display module 1000 is used to display the working status of the blast freezer.

[0097] In a preferred embodiment, the display module 1000 includes a display driver unit 1010 and a digital tube display unit 1020. The display signal terminals (i.e., DIO1, CLK1, and STB1) of the second main control module 700 are connected to the display signal terminals of the display driver unit 1010. The digit selection signal terminals (i.e., GR1, GR2, GR3, GR4, and GR5) of the display driver unit 1010 are connected to the digit selection signal terminals of the digital tube display unit 1020. The segment selection signal terminals (i.e., A1, B1, C1, D1, E1, F1, G1, and DP1) of the display driver unit 1010 are connected to the segment selection signal terminals of the digital tube display unit 1020.

[0098] Alternatively, the display driver unit 1010 may include a display driver chip U4, preferably an AIP1628.

[0099] Alternatively, the digital tube display unit 1020 may include a digital tube display U3, preferably of model XH-7545.

[0100] In this embodiment, the blast freezer is also equipped with a visual status display mechanism. When the equipment malfunctions, it will not only emit a beeping sound to alert the user, but also display the code of the current fault status through a digital tube display unit. This allows the user to quickly locate the cause of the fault, reduce troubleshooting time, and take corresponding measures to resolve the fault as quickly as possible.

[0101] Those skilled in the art should understand that the above description is one embodiment provided in conjunction with specific content, and does not imply that the specific implementation of this utility model is limited to these descriptions. Furthermore, due to differences in industry naming conventions, it is not limited to the above names or English names. Any methods or structures similar to or identical to those of this utility model, or any technical deductions or substitutions made based on the concept of this utility model, should be considered within the scope of protection of this utility model.

Claims

1. A control circuit for a quick-freezing cabinet, characterized in that, include: A power module, the input terminal of which is connected to the mains power supply, is used to provide a stable operating voltage for the control circuit; A temperature acquisition module, wherein the power supply terminal of the temperature acquisition module is connected to the output terminal of the power supply module, and the temperature acquisition module is used to acquire the cabinet temperature and food temperature in real time. A temperature conversion module is provided, wherein the input end of the temperature conversion module is connected to the output end of the temperature acquisition module, and the temperature conversion module is used to convert the real-time acquired cabinet temperature into a cabinet temperature value. The temperature conversion module is also used to convert the real-time acquired food temperature into a food temperature value. The first main control module has its control signal input terminal connected to the output terminal of the temperature conversion module. The first main control module outputs a first quick-freezing stage signal if the cabinet temperature value is greater than a first preset refrigeration and quick-freezing temperature value. When the food temperature value reaches the first preset food refrigeration and quick-freezing temperature value and the cabinet temperature value is greater than a second preset refrigeration and quick-freezing temperature value, the first main control module outputs a second quick-freezing stage signal. When the food temperature value reaches the second preset food refrigeration and quick-freezing temperature value and the cabinet temperature value is greater than a third preset refrigeration and quick-freezing temperature value, the first main control module outputs a third quick-freezing stage signal. The load drive module has its input terminal connected to the control signal output terminal of the first main control module. The load drive module is used to drive the refrigerated freezer to perform the corresponding quick-freezing operation when it receives the first quick-freezing stage signal, the second quick-freezing stage signal, or the third quick-freezing stage signal.

2. The control circuit for a quick-freezing cabinet according to claim 1, characterized in that, The power module includes: A rectifier unit, the input terminal of which is connected to the mains power supply, is used to convert the mains power supply into DC power supply; The first step-down unit has its input terminal connected to the output terminal of the rectifier unit. The first step-down unit is used to step down the DC power supply to a first DC voltage. The second step-down unit has its input terminal connected to the output terminal of the first step-down unit, and is used to step down the first DC voltage to a second DC voltage.

3. The control circuit for a quick-freezing cabinet according to claim 2, characterized in that, The temperature acquisition module includes: The cabinet temperature acquisition unit has its input terminal electrically connected to the cabinet temperature probe and its output terminal connected to the cabinet temperature signal input terminal of the temperature conversion module. The cabinet temperature acquisition unit is used to acquire the current cabinet temperature of the refrigerated freezer in real time. The food temperature acquisition unit has an input terminal electrically connected to a temperature sensing probe and an output terminal connected to the food temperature signal input terminal of the temperature conversion module. The food temperature acquisition unit is used to acquire the current temperature of the food in real time.

4. The control circuit for a quick-freezing cabinet according to claim 3, characterized in that, The cabinet temperature acquisition unit includes a cabinet temperature probe interface J3, a capacitor C3, a resistor R2, and a resistor R3. The signal output terminal of the cabinet temperature probe interface J1 is connected to one end of the capacitor C3, the other end of the capacitor C3 is connected to one end of the resistor R3, and the other end of the resistor R3 is connected to the cabinet temperature signal input terminal of the temperature conversion module. The resistor R2 is connected between the ground terminal of the cabinet temperature probe interface J1 and ground.

5. The control circuit for a quick-freezing cabinet according to claim 3, characterized in that, The food temperature acquisition unit includes a temperature probe interface J4, a capacitor C27, a resistor R7, and a resistor R29. The signal output terminal of the temperature probe interface J4 is connected to one end of the capacitor C27, the other end of the capacitor C27 is connected to one end of the resistor R29, and the other end of the resistor R29 is connected to the food temperature signal input terminal of the temperature conversion module. The resistor R7 is connected between the ground terminal of the temperature probe interface J4 and ground.

6. The control circuit for a quick-freezing cabinet according to claim 3, characterized in that, The temperature conversion module includes a temperature conversion chip U2. The cabinet temperature signal input terminal of the temperature conversion chip U2 is connected to the output terminal of the cabinet temperature acquisition unit. The food temperature signal input terminal of the temperature conversion chip U2 is connected to the output terminal of the food temperature acquisition unit. The output terminal of the temperature conversion chip U2 is connected to the control signal input terminal of the first main control module.

7. The control circuit for a quick-freezing cabinet according to claim 2, characterized in that, The load driving module includes: A drive unit, the input terminal of which is connected to the control signal output terminal of the first main control module, is used to output a drive signal when it receives the first quick-freezing stage signal, the second quick-freezing stage signal, or the third quick-freezing stage signal. A load unit, the input of which is connected to the output of the drive unit, is used to drive the blast freezer to perform a corresponding blast freezer operation when it receives the drive signal.

8. The control circuit for a quick-freezing cabinet according to claim 7, characterized in that, The load unit includes a relay RE1. The first output terminal of the drive unit is connected to the first coil terminal of the relay RE1. The output terminal of the rectifier unit is connected to the second coil terminal of the relay RE1. The common terminal of the relay RE1 is connected to the live wire terminal of the mains power supply. The normally open terminal of the relay RE1 is electrically connected to the compressor.

9. The control circuit for a quick-freezing cabinet according to claim 1 or 2, characterized in that, Also includes: A function mode selection module is used to select the function mode of the refrigeration and quick-freezing cabinet and output a function mode selection signal. The second main control module has its mode selection terminal connected to the signal output terminal of the function mode selection module. The second main control module is used to output a mode switching signal when it receives the function mode selection signal. The communication module has a communication signal terminal connected to the communication signal terminal of the second main control module, and a communication control terminal electrically connected to the blast freezer. The communication module is used to control the blast freezer to execute the corresponding functional mode when it receives the mode switching signal.

10. The control circuit for a quick-freezing cabinet according to claim 9, characterized in that, The communication module includes a communication chip U7 and a communication interface J2. The communication signal terminal of the second main control module is connected to the communication signal terminal of the communication chip U7, and the communication control terminal of the communication chip U7 is connected to the input terminal of the communication interface J2.

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