A temperature display controller

Abstract

The application discloses a temperature display controller, comprising a power supply circuit, a temperature acquisition circuit, a main control circuit and a temperature display alarm circuit, the temperature acquisition circuit is used for collecting the cabinet temperature and the article temperature in real time, the main control circuit outputs the corresponding alarm signal according to whether the cabinet temperature is greater than the preset cabinet high temperature alarm value or less than the preset cabinet low temperature alarm value, and also outputs the corresponding alarm signal according to whether the article temperature is greater than the preset article high temperature alarm value or less than the preset article low temperature alarm value, and the temperature display alarm circuit is used for alarming, prompting, displaying the current temperature value and the alarm type. Compared with the traditional single detection mode, the application can avoid the situation that the article deteriorates due to the abnormal article temperature while the cabinet temperature is normal, and the double monitoring mode can also timely alarm and prompt the user when the refrigeration equipment fails, so that the article is prevented from being frozen or deteriorated due to the refrigeration equipment failure.

Description

[Technical Field]

[0001] This utility model relates to the field of refrigeration equipment technology, and in particular to a temperature display controller. [Background Technology]

[0002] Currently, refrigeration equipment is widely used in medical, commercial, and catering fields. In the medical field, using refrigeration equipment for frozen storage of medicines is a key piece of equipment for hospital pharmacies and biopharmaceutical companies. Since the stored medicines are mainly temperature-sensitive materials such as vaccines and biological agents, they need to be maintained in a suitable storage temperature range for a long time to avoid loss of drug activity, drug deterioration, and failure of efficacy, which could lead to medication safety accidents.

[0003] Currently, most refrigeration equipment on the market uses single-mode temperature monitoring, only detecting the ambient temperature inside the cabinet and failing to simultaneously acquire the temperature of the stored items. In practical applications, it often happens that the cabinet temperature is normal, but the item temperature is abnormal, leading to spoilage and making it difficult to prevent risks at the source. Furthermore, when refrigeration equipment malfunctions, existing monitoring systems have inadequate alarm functions, failing to promptly alert users and easily causing items to freeze or spoil. Additionally, traditional alarm mechanisms lack visual displays of alarm types and abnormal temperatures, making it difficult for users to quickly locate the fault and take timely countermeasures, potentially leading to further equipment failure or deterioration of the item's condition. [Utility Model Content]

[0004] To solve the above-mentioned technical problems, this utility model provides a temperature display controller.

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

[0006] A temperature display controller, comprising:

[0007] A power supply circuit, the input terminal of which is connected to the mains power supply, is used to provide operating power to the temperature display controller;

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

[0009] The main control circuit is connected to the output terminal of the temperature acquisition circuit. The main control circuit is used to output a high temperature alarm signal if the cabinet temperature is greater than the preset high temperature alarm value or less than the preset low temperature alarm value, and output a low temperature alarm signal if the cabinet temperature is less than the preset low temperature alarm value.

[0010] The main control circuit is also used to output a high temperature alarm signal if the temperature of the item is greater than the preset high temperature alarm value or less than the preset low temperature alarm value, and output a low temperature alarm signal if the temperature of the item is less than the preset low temperature alarm value.

[0011] A temperature display alarm circuit is provided, the input terminal of which is connected to the control terminal of the main control circuit. The temperature display alarm circuit is used to issue a high temperature alarm signal and display the current temperature value and alarm type when it receives a high temperature alarm signal from the cabinet or a high temperature alarm signal from the item. The temperature display alarm circuit is also used to issue a low temperature alarm and display the current temperature value and alarm type when it receives a low temperature alarm signal from the cabinet or a low temperature alarm signal from the item.

[0012] By adopting the above technical solution, the main control circuit can monitor the current cabinet temperature and the current temperature of the stored items in the refrigeration equipment in real time through the temperature acquisition module. This achieves dual monitoring of both the cabinet temperature and the temperature of the stored items. Compared with the traditional single detection method, this can prevent the situation where the cabinet temperature is normal but the item temperature is abnormal, thus avoiding the spoilage of the items. Furthermore, this dual monitoring method can promptly alert the user when the refrigeration equipment malfunctions, preventing the items from freezing or spoiling due to the refrigeration equipment failure. Secondly, the temperature display alarm circuit can display the current alarm type and the current abnormal temperature, allowing the user to visually detect the problem and quickly locate the fault. This enables the user to take appropriate countermeasures quickly, preventing further deterioration of the equipment or stored items.

[0013] As described above, in a temperature display controller, the power supply circuit includes:

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

[0015] A first step-down module, the input terminal of which is connected to the output terminal of the rectifier module, is used to step down the DC power supply to a first DC voltage;

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

[0017] As described above, in a temperature display controller, the temperature acquisition circuit includes:

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

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

[0020] As described above, the temperature display controller includes a cabinet temperature acquisition module comprising a cabinet temperature probe interface J1, a capacitor C13, a resistor R33, and a resistor R34. The signal output terminal of the cabinet temperature probe interface J1 is connected to one end of the capacitor C13, the other end of the capacitor C13 is connected to one end of the resistor R34, and the other end of the resistor R34 is connected to the cabinet temperature acquisition signal terminal of the main control circuit. The resistor R33 is connected between the grounding terminal of the cabinet temperature probe interface J1 and ground.

[0021] As described above, the temperature display controller includes a temperature sensor interface J3, a capacitor C12, a resistor R5, and a resistor R12. The signal output terminal of the temperature sensor interface J3 is connected to one end of the capacitor C12, the other end of the capacitor C12 is connected to one end of the resistor R5, and the other end of the resistor R5 is connected to the temperature acquisition signal terminal of the main control circuit. The resistor R12 is connected between the ground terminal of the temperature sensor interface J3 and ground.

[0022] As described above, the temperature display and alarm circuit of the temperature display controller includes:

[0023] An alarm module is provided, the input terminal of which is connected to the alarm control terminal of the main control circuit. The alarm module is used to execute a high temperature alarm when it receives a high temperature alarm signal from the cabinet or a high temperature alarm signal from the item. The alarm module is also used to execute a low temperature alarm when it receives a low temperature alarm signal from the cabinet or a low temperature alarm signal from the item.

[0024] The display module has its input terminal connected to the display control terminal of the main control circuit. When the display module receives a high temperature alarm signal or a low temperature alarm signal, it displays the current temperature and current alarm type of the cabinet. The display module is also used to display the current temperature and current alarm type of the item when it receives a high temperature alarm signal or a low temperature alarm signal.

[0025] As described above, in a temperature display controller, the alarm module includes:

[0026] The drive unit has its alarm signal input terminal connected to the alarm control terminal of the main control circuit.

[0027] A buzzer, the power supply terminal of which is connected to the output terminal of the first step-down module, and the signal input terminal of which is connected to the alarm signal output terminal of the drive unit.

[0028] As described above, in a temperature display controller, the display module includes:

[0029] A temperature display unit, the input terminal of which is connected to the first display control terminal of the main control circuit, is used to display the current cabinet temperature or the current item temperature;

[0030] An alarm type display unit is provided, the input terminal of which is connected to the second display control terminal of the main control circuit. The alarm type display unit is used to display the alarm type of the cabinet temperature or the alarm type of the item temperature.

[0031] As described above, in a temperature display controller, the power supply circuit further includes:

[0032] A battery power supply module is provided to provide backup power for the temperature display controller.

[0033] The temperature display controller described above further includes:

[0034] The mains power detection circuit has its input terminal connected to the detection signal terminal of the rectifier module and its output terminal connected to the detection signal feedback terminal of the main control circuit. The mains power detection circuit is used to output an alarm signal for abnormal mains power when it detects that the mains power supply is disconnected.

[0035] Compared with the prior art, the temperature display controller proposed in this utility model has the following advantages:

[0036] 1. The temperature display controller proposed in this utility model monitors the current cabinet temperature and the current temperature of the items stored in the refrigeration equipment in real time through a temperature acquisition module. This achieves dual monitoring of the cabinet temperature and the temperature of the stored items. Compared with the traditional single detection method, it can prevent the situation where the cabinet temperature is normal but the item temperature is abnormal, thus avoiding the spoilage of the items. In addition, this dual monitoring method can also promptly alarm and remind the user when the refrigeration equipment malfunctions, preventing the items from freezing or spoiling due to the refrigeration equipment failure.

[0037] 2. The temperature display controller proposed in this utility model also includes a temperature display alarm circuit. The temperature display alarm circuit can display the current alarm type and the current abnormal temperature, allowing users to visually detect and quickly locate the fault. This enables them to take corresponding countermeasures quickly to prevent further deterioration of the equipment or stored items. [Attached Image Description]

[0038] 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.

[0039] Figure 1 This is a block diagram illustrating the circuit principle structure of this utility model;

[0040] Figure 2 This is a circuit schematic diagram of the rectifier module of this utility model;

[0041] Figure 3 This is a circuit diagram of the step-down module of this utility model;

[0042] Figure 4 This is a partial circuit diagram of the battery power supply module of this utility model;

[0043] Figure 5 This is a schematic diagram of the temperature acquisition circuit of this utility model.

[0044] Figure 6 This is a schematic diagram of the main control circuit of this utility model;

[0045] Figure 7 This is a circuit diagram of the alarm module of this utility model;

[0046] Figure 8 This is a circuit schematic diagram of the display module of this utility model;

[0047] Figure 9 This is a circuit diagram of the mains power detection circuit of this utility model;

[0048] Figure 10 This is a circuit diagram of the load circuit part 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] The temperature display controller described in this specification is applied to the field of refrigeration equipment, which may include, but is not limited to, freezers, refrigerators, and freezers. In addition, the items stored in the refrigeration equipment described in this specification may include, but are not limited to, medicines, food, and other items that need to be frozen. This specification uses the freezing of medicines in a freezer as an example to illustrate the implementation scenario. Other refrigeration equipment and stored items can be implemented by referring to this scenario, and will not be described in detail here.

[0051] Specific embodiments, combined with Figures 1 to 10 As shown, further illustrating the technical solution of this utility model, a temperature display controller includes a power supply circuit 100, a temperature acquisition circuit 200, a main control circuit 300, and a temperature display alarm circuit 400. The input terminal of the power supply circuit 100 is connected to the mains power supply, and the power supply circuit 100 provides operating power to the temperature display controller. The power supply terminal of the temperature acquisition circuit 200 is connected to the output terminal of the power supply circuit 100, and the temperature acquisition circuit 200 is used to acquire the cabinet temperature and the item temperature in real time. The temperature acquisition signal terminal of the main control circuit 300 is connected to the output terminal of the temperature acquisition circuit 200. The main control circuit 300 is used to output a high cabinet temperature alarm if the cabinet temperature is greater than a preset high cabinet temperature alarm value or less than a preset low cabinet temperature alarm value. The main control circuit 300 is also used to output a low-temperature alarm signal if the temperature of the item is greater than or less than a preset high-temperature alarm value, and output a low-temperature alarm signal if the temperature is greater than the preset high-temperature alarm value. The input terminal of the temperature display alarm circuit 400 is connected to the control terminal of the main control circuit 300. The temperature display alarm circuit 400 is used to issue a high-temperature alarm and display the current temperature value and alarm type when it receives a high-temperature alarm signal or an item high-temperature alarm signal. The temperature display alarm circuit 400 is also used to issue a low-temperature alarm and display the current temperature value and alarm type when it receives a low-temperature alarm signal or an item low-temperature alarm signal.

[0052] In this embodiment, the main control circuit can monitor the current cabinet temperature and the current item temperature inside the refrigeration equipment in real time through the temperature acquisition module. This achieves dual monitoring of both the cabinet temperature and the item temperature. Compared to traditional single-detection methods, this avoids situations where the cabinet temperature is normal but the item temperature is abnormal, leading to item spoilage. Furthermore, this dual monitoring method can promptly alert the user when the refrigeration equipment malfunctions, preventing items from freezing or spoiling due to equipment failure. Secondly, the temperature display alarm circuit can display the current alarm type and the current abnormal temperature, allowing users to visually detect and quickly locate the fault, thus enabling them to take appropriate countermeasures quickly and prevent further deterioration of the equipment or stored items.

[0053] Furthermore, as a preferred embodiment of this solution and not a limitation thereof, the power supply circuit 100 includes a rectifier module 110, a first step-down module 120, and a second step-down module 130. The input terminal of the rectifier module 110 is connected to the mains power supply, and the rectifier module 110 is used to convert the mains power supply into DC power. The input terminal of the first step-down module 120 is connected to the output terminal of the rectifier module 110, and the first step-down module 120 is used to step down the DC power supply to a first DC voltage. The input terminal of the second step-down module 130 is connected to the output terminal of the first step-down module 120, and the second step-down module 130 is used to step down the first DC voltage to a second DC voltage.

[0054] The mains power supply outputs a 12V DC voltage after being rectified and converted by the rectifier module 110. The first DC voltage output after the 12V DC voltage is stepped down by the first step-down module 120 is a 5V DC voltage. The second DC voltage output after the 5V DC voltage is stepped down by the second step-down module 130 is a 3.3V DC voltage.

[0055] In a preferred embodiment, the rectifier module 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 module 120.

[0056] Alternatively, the rectifier bridge DB1 is preferably model DB2075.

[0057] 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.

[0058] In a preferred embodiment, the first step-down module 120 includes a linear regulator U8, the output terminal of the rectifier unit 110 is connected to the input terminal (i.e., VIN terminal) of the linear regulator U8, the ground terminal (i.e., GND terminal) of the linear regulator U8 is grounded, and the output terminal (i.e., VOUT terminal) of the linear regulator U8 is connected to the input terminal of the second step-down module 130.

[0059] Alternatively, the linear regulator U8 is preferably model L78M05 or LM39100S.

[0060] In a preferred embodiment, the second step-down module 130 includes a linear regulator U4. The output terminal of the first step-down module 120 is connected to the input terminal (i.e., VIN terminal) of the linear regulator U4. The ground terminal (i.e., GND terminal) of the linear regulator U4 is grounded. The output terminal (i.e., VOUT terminal) of the linear regulator U4 outputs a second DC voltage.

[0061] Alternatively, the linear regulator U4 is preferably model HT7133.

[0062] In this embodiment, linear regulators U4 and U8 are used to step down the input 12V DC voltage to 5V DC voltage and 3.3V 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.

[0063] Furthermore, as a preferred embodiment of this solution and not a limitation thereof, the power supply circuit 100 also includes a battery power supply module 140, which is used to provide backup power for the temperature display controller.

[0064] In a preferred embodiment, the battery power supply module 140 includes a battery J5 and a diode D1. The positive output terminal (i.e., pin 1) of the battery J5 is connected to the positive terminal of the diode D1, the negative terminal of the diode D1 outputs a 12V DC voltage, and the negative output terminal (i.e., pin 2) of the battery J5 is grounded.

[0065] Alternatively, the battery J5 is preferably a 6V storage battery.

[0066] In this embodiment, the battery power supply module serves as a backup power source, enabling it to continue supplying power to the temperature display controller after the mains power is disconnected. Through the redundant design of the main power supply + backup power supply, the temperature display controller is prevented from stopping due to a sudden interruption of the mains power, ensuring that the temperature monitoring of the equipment can continue to operate. This prevents the failure to detect abnormal temperatures of stored medicines due to sudden shutdown of the equipment, which could ultimately lead to loss of activity and deterioration of the stored medicines.

[0067] Secondly, by utilizing the unidirectional conductivity of diode D1, mutual interference between the main power supply and the backup power supply is prevented. When the mains power is supplied normally, its output voltage will be applied in reverse across the two ends of diode D1, causing it to be cut off. At this time, battery J5 does not participate in power supply, thus avoiding interference to the main power supply circuit. When the mains power is disconnected, diode D1 conducts in the forward direction, and battery J5 can stably output voltage to power the temperature display controller.

[0068] Furthermore, as a preferred embodiment of this solution and not a limitation, the temperature acquisition circuit 200 includes a cabinet temperature acquisition module 210 and an item temperature acquisition module 220. The input terminal of the cabinet temperature acquisition module 210 is electrically connected to a cabinet temperature probe, and the output terminal of the cabinet temperature acquisition module 220 is connected to the cabinet temperature acquisition signal terminal of the main control circuit 300. The cabinet temperature acquisition module 210 is used to acquire the current cabinet temperature in real time. The input terminal of the item temperature acquisition module 220 is electrically connected to a temperature sensing probe, and the output terminal of the item temperature acquisition module 220 is connected to the item temperature acquisition signal terminal of the main control circuit 300. The item temperature acquisition module 220 is used to acquire the current temperature of the item in real time.

[0069] In a preferred embodiment, the cabinet temperature acquisition module 210 includes a cabinet temperature probe interface J1, a capacitor C13, a resistor R33, and a resistor R34. The signal output terminal (i.e., pin 2) of the cabinet temperature probe interface J1 is connected to one end of the capacitor C13, the other end of the capacitor C13 is connected to one end of the resistor R34, and the other end of the resistor R34 is connected to the cabinet temperature acquisition signal terminal (i.e., NTC1 terminal) of the main control circuit 300. The ground terminal (i.e., pin 1) of the cabinet temperature probe interface J1 is connected to ground via the resistor R33.

[0070] Specifically, the cabinet temperature probe interface J1 is connected to an external cabinet temperature probe, preferably an NTC thermistor probe. When the temperature inside the freezer changes, the resistance value of the cabinet temperature probe changes accordingly, thereby outputting a corresponding temperature change signal. The grounding terminal (pin 1) of the cabinet temperature probe interface J1 is grounded through resistor R33, forming a voltage divider circuit with the external cabinet temperature probe, converting the output temperature change signal into a corresponding voltage signal. Capacitor C13 and resistor R34 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. After receiving the voltage signal, the cabinet temperature acquisition signal terminal (NTC1 terminal) of the main control circuit 300 converts it into the corresponding cabinet temperature value.

[0071] In a preferred embodiment, the item temperature acquisition module 220 includes a temperature probe interface J3, a capacitor C12, a resistor R5, and a resistor R12. The signal output terminal (i.e., pin 2) of the temperature probe interface J3 is connected to one end of the capacitor C12, the other end of the capacitor C12 is connected to one end of the resistor R5, and the other end of the resistor R5 is connected to the item temperature acquisition signal terminal (i.e., NTC2 terminal) of the main control circuit 300. The ground terminal (i.e., pin 1) of the temperature probe interface J3 is connected to ground via the resistor R12.

[0072] Specifically, a temperature sensor is connected to the temperature sensor interface J3. The temperature sensor is preferably an NTC thermistor probe. When the temperature of the medicine stored in the freezer changes, the resistance value of the temperature sensor will change accordingly, thereby outputting a corresponding temperature change signal. The ground terminal (pin 1) of the temperature sensor interface J3 is grounded through resistor R12, forming a voltage divider circuit with the external temperature sensor to convert the output temperature change signal into a corresponding voltage signal. Capacitor C12 and resistor R5 act as an RC filter circuit, which can filter out high-frequency interference in the voltage signal, making the signal transmission smoother and more stable. After receiving the voltage signal, the item temperature acquisition signal terminal (NTC2 terminal) of the main control circuit 300 converts it into the corresponding item temperature value.

[0073] Furthermore, as a preferred embodiment of this solution and not a limitation, the main control circuit 300 includes a main control chip U1, and the main control chip U1 is preferably CH549L.

[0074] Furthermore, as a preferred embodiment of this solution and not a limitation, the temperature display alarm circuit 400 includes an alarm module 410 and a display module 420. The input terminal of the alarm module 410 is connected to the alarm control terminal of the main control circuit 300. The alarm module 410 is used to execute a high-temperature alarm when it receives a high-temperature alarm signal from the cabinet or a high-temperature alarm signal from the item. The alarm module 410 is also used to execute a low-temperature alarm when it receives a low-temperature alarm signal from the cabinet or a low-temperature alarm signal from the item. The input terminal of the display module 420 is connected to the display control terminal of the main control circuit 300. The display module 420 is used to display the current temperature and current alarm type of the cabinet when it receives a high-temperature alarm signal from the cabinet or a low-temperature alarm signal from the cabinet. The display module 420 is also used to display the current temperature and current alarm type of the item when it receives a high-temperature alarm signal or a low-temperature alarm signal from the item.

[0075] In a preferred embodiment, the alarm module 410 includes a drive unit 411 and a buzzer BZ1. The alarm control terminal (i.e., BUZ-IN terminal) of the main control circuit 300 is connected to the alarm signal input terminal (i.e., IN4 terminal) of the drive unit 411. The alarm signal output terminal (i.e., OUT4 terminal) of the drive unit 411 is connected to the signal input terminal (i.e., pin 2) of the buzzer BZ1. The power supply terminal (i.e., pin 1) of the buzzer BZ1 is connected to the output terminal of the first step-down module 120.

[0076] Alternatively, the drive unit 411 is preferably of model ULN2003A.

[0077] Specifically, when the main control circuit 300 receives the current cabinet temperature collected by the cabinet temperature acquisition module 210, it compares it with the preset high temperature alarm value and preset low temperature alarm value of the main control circuit 300. If the current cabinet temperature of the freezer is greater than the preset high temperature alarm value, the alarm control terminal (BUZ-IN terminal) of the main control circuit 300 outputs a high temperature alarm signal to the alarm signal input terminal (IN4 terminal) of the drive unit 411. After receiving the high temperature alarm signal, the drive unit 411 drives the buzzer BZ1 to run through the alarm signal output terminal (OUT4 terminal), thereby emitting a buzzer prompting sound to remind the user.

[0078] If the current temperature of the freezer is lower than the preset low temperature alarm value, the alarm control terminal (BUZ-IN terminal) of the main control circuit 300 outputs a low temperature alarm signal to the alarm signal input terminal (IN4 terminal) of the drive unit 411. After receiving the low temperature alarm signal, the drive unit 411 drives the buzzer BZ1 to run through the alarm signal output terminal (OUT4 terminal), thereby emitting a buzzer sound to remind the user.

[0079] Similarly, when the main control circuit 300 receives the current stored medicine temperature collected by the item temperature acquisition module 220, it compares it with the preset high temperature alarm value and preset low temperature alarm value of the item in the main control circuit 300. If it is greater than the preset high temperature alarm value, it outputs the item high temperature alarm signal; if it is less than the preset low temperature alarm value, it outputs the item low temperature alarm signal. The drive unit 411 drives the buzzer BZ1 to run according to the received item high temperature alarm signal or item low temperature alarm signal.

[0080] It should be noted that the preset high temperature alarm value, preset low temperature alarm value, preset high temperature alarm value for items, and preset low temperature alarm value for items mentioned above in this embodiment are preset in the main control chip U1. The specific values ​​can be adjusted according to actual usage needs. This embodiment does not impose specific limitations on these values. In addition, when a high temperature alarm occurs, if the current temperature of the freezer is subsequently detected to be lower than the preset high temperature alarm value minus the alarm hysteresis value, the high temperature alarm will end. When a low temperature alarm occurs, if the current temperature of the freezer is subsequently detected to be higher than the preset low temperature alarm value plus the alarm hysteresis value, the low temperature alarm will end. When a high temperature alarm occurs for items, if the current temperature of the stored medicine is subsequently detected to be lower than the preset high temperature alarm value for items minus the alarm hysteresis value, the high temperature alarm will end. When a low temperature alarm occurs for items, if the current temperature of the stored medicine is subsequently detected to be higher than the preset low temperature alarm value for items plus the alarm hysteresis value, the low temperature alarm will end.

[0081] In addition, the alarm hysteresis value mentioned above is set by the user according to actual needs, and its specific setting range is 0.1~20.0℃ or 0.2~36.0℉. This embodiment does not make specific limitations on the specific setting value.

[0082] In some preferred embodiments, in order to distinguish between high temperature alarms and low temperature alarms, the frequency and duration of the buzzer can be adjusted by the high temperature alarm signal and the low temperature alarm signal output by the main control circuit 300. For example, when a high temperature alarm occurs, the buzzer sounds continuously, and when a low temperature alarm occurs, the buzzer sounds intermittently. Thus, the user can determine the alarm type by the sound frequency of the buzzer.

[0083] In this embodiment, if either the freezer temperature or the temperature of the stored medicine becomes abnormal, the user will be promptly alerted by a buzzer, allowing the user to take appropriate measures to prevent further deterioration of the equipment or the stored medicine.

[0084] In a preferred embodiment, the display module 420 includes a temperature display unit 421 and an alarm type display unit 422. The input terminal of the temperature display unit 421 is connected to the first display control terminal of the main control circuit 300, and the temperature display unit 421 is used to display the current cabinet temperature or the current item temperature. The input terminal of the alarm type display unit 422 is connected to the second display control terminal of the main control circuit 300, and the alarm type display unit 422 is used to display the alarm type of the cabinet temperature or the alarm type of the item temperature.

[0085] In a preferred embodiment, the temperature display unit 421 includes a first display driver chip U5 and a first digital tube display U2. The first display control terminal (i.e., CLK terminal and DIO terminal) of the main control circuit 300 is connected to the input terminal of the first display driver chip U5. The bit selection signal terminals (i.e., BIT1 terminal, BIT2 terminal, BIT3 terminal and BIT7 terminal) of the first display driver chip U5 are connected to the bit selection signal terminals of the first digital tube display U2. The segment selection signal terminals (i.e., A terminal, B terminal, C terminal, D terminal, E terminal, F terminal, G terminal and DP terminal) of the first display driver chip U5 are connected to the segment selection signal terminals of the first digital tube display U2.

[0086] Alternatively, the first display driver chip U5 is preferably AIP650, and the first digital tube display U2 is preferably 0563.

[0087] In a preferred embodiment, the alarm type display unit 422 includes a second display driver chip U6 and a second digital tube display U3. The second display control terminal (i.e., CLK1 terminal and DIO1 terminal) of the main control circuit 300 is connected to the input terminal of the second display driver chip U6. The bit selection signal terminals (i.e., BIT1 terminal, BIT2 terminal, BIT3 terminal and BIT7 terminal) of the second display driver chip U6 are connected to the bit selection signal terminals of the second digital tube display U3. The segment selection signal terminals (i.e., A terminal, B terminal, C terminal, D terminal, E terminal, F terminal, G terminal and DP terminal) of the second display driver chip U6 are connected to the segment selection signal terminals of the second digital tube display U3.

[0088] Alternatively, the second display driver chip U6 is preferably AIP650, and the second digital tube display U3 is preferably 0563.

[0089] Specifically, when the main control circuit 300 determines that the current cabinet temperature is greater than the preset high temperature alarm value, the first display control terminal (i.e., CLK terminal and DIO terminal) of the main control circuit 300 outputs a cabinet temperature display signal, and the second display control terminal (i.e., CLK1 terminal and DIO1 terminal) of the main control circuit 300 outputs a high temperature alarm display signal. After receiving the cabinet temperature display signal, the input terminal of the first display driver chip U5 controls the first digital tube display U2 to display the current cabinet temperature through the bit selection signal terminal and segment selection signal terminal of the first display driver chip U5. Similarly, after receiving the high temperature alarm display signal, the input terminal of the second display driver chip U6 controls the second digital tube display U3 to alternately display H1 through the bit selection signal terminal and segment selection signal terminal of the second display driver chip U6.

[0090] When the main control circuit determines that the current cabinet temperature is lower than the preset low temperature alarm value, the first display control terminal (i.e., CLK terminal and DIO terminal) of the main control circuit 300 outputs the cabinet temperature display signal, and the second display control terminal (i.e., CLK1 terminal and DIO1 terminal) of the main control circuit 300 outputs the low temperature alarm display signal. After receiving the cabinet temperature display signal, the input terminal of the first display driver chip U5 controls the first digital tube display U2 to display the current cabinet temperature through the bit selection signal terminal and segment selection signal terminal of the first display driver chip U5. Similarly, after receiving the low temperature alarm display signal, the input terminal of the second display driver chip U6 controls the second digital tube display U3 to alternately display L0 through the bit selection signal terminal and segment selection signal terminal of the second display driver chip U6.

[0091] Similarly, when the main control circuit 300 determines that the current temperature of the stored medicine is greater than the preset high temperature alarm value, the first display driver chip U5 controls the first digital tube display U2 to display the current temperature of the stored medicine, and the second display driver chip U6 controls the second digital tube display U3 to alternately display H2. When the main control circuit 300 determines that the current temperature of the stored medicine is less than the preset low temperature alarm value, the first display driver chip U5 controls the first digital tube display U2 to display the current temperature of the stored medicine, and the second display driver chip U6 controls the second digital tube display U3 to alternately display L2.

[0092] In this embodiment, the display module displays the current alarm type and corresponding current temperature through a temperature display unit and an alarm type display unit. This allows the user to quickly obtain the current alarm type and the specific value of the current temperature through the digital tube display after hearing the buzzer sound. The user can then quickly take corresponding measures based on the alarm type and the current temperature, reducing the time spent troubleshooting temperature anomalies. Furthermore, displaying the temperature and alarm type separately avoids interference between the two different display signals, ensuring the accuracy of the displayed information.

[0093] Furthermore, as a preferred embodiment of this solution and not a limitation, it also includes a mains power detection circuit 500. The input terminal of the mains power detection circuit 500 is connected to the detection signal terminal of the rectifier module 110, and the output terminal of the mains power detection circuit 500 is connected to the detection signal feedback terminal of the main control circuit 300. The mains power detection circuit 500 is used to output a mains power abnormality alarm signal after detecting that the mains power supply is disconnected.

[0094] In a preferred embodiment, the mains power detection circuit 500 includes a resistor R1 and a diode D2. The detection signal terminal (i.e., AC1 terminal) of the rectifier module 110 is connected to the positive terminal of the diode D2, the negative terminal of the diode D2 is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to the detection signal feedback terminal (i.e., DET terminal) of the main control circuit 300.

[0095] In this embodiment, the mains power detection circuit can monitor the on / off status of the mains power in real time and promptly report back to the main control circuit after the mains power is disconnected. After receiving the feedback, the main control circuit promptly alerts the user through the temperature display alarm circuit, preventing the user from continuing to use the freezer without knowing that the mains power is disconnected, and also preventing the temperature display controller from losing control of temperature monitoring due to prolonged use, which could ultimately lead to abnormal malfunctions such as spoilage of stored medicines.

[0096] Furthermore, as a preferred embodiment of this solution and not a limitation, it also includes a load circuit 600, the driving end of which is connected to the load signal output end of the driving unit 411, and the load signal input end of the driving unit 411 is connected to the load control end of the main control circuit 300. The load circuit 600 is used to drive the load to run.

[0097] In a preferred embodiment, the load circuit 600 includes relays RE1 and RE2. The first load signal output terminal (i.e., OUT1 terminal) of the drive unit 411 is connected to the first coil terminal (i.e., pin 1) of the relay RE1, the second coil terminal (i.e., pin 2) of the relay RE1 is connected to the output terminal (i.e., +12V) of the rectifier unit 110, the common terminal (i.e., pin 3) of the relay RE1 is connected to the live wire terminal of the mains power supply, and the normally open terminal (i.e., pin 4) of the relay RE1 is electrically connected to the door switch.

[0098] The second load signal output terminal (i.e., OUT2 terminal) of the drive unit 411 is connected to the first coil terminal (i.e., pin 1) of the relay RE2, the second coil terminal (i.e., pin 2) of the relay RE2 is connected to the output terminal (i.e., +12V) of the rectifier unit 110, the common terminal (i.e., pin 3) of the relay RE2 is connected to the live wire terminal of the mains power supply, and the normally open terminal (i.e., pin 4) of the relay RE2 is electrically connected to the compressor.

[0099] Specifically, when the main control circuit 300 determines that the current cabinet temperature is greater than the preset high temperature alarm value, the load control terminal of the main control circuit 300 outputs a load drive signal. After the load signal input terminal of the drive unit 411 receives the load drive signal, the second load signal output terminal (OUT2 terminal) of the drive unit 411 outputs a high-level signal to control the compressor to start running, so that the compressor will start cooling.

[0100] When the main control circuit 300 determines that the current cabinet temperature is lower than the preset low temperature alarm value, the load control terminal of the main control circuit 300 outputs a load stop signal. After the load signal input terminal of the drive unit 411 receives the load stop signal, the second load signal output terminal (OUT2 terminal) of the drive unit 411 outputs a low-level signal to control the compressor to stop running.

[0101] In this embodiment, the compressor is started and stopped using a relay, which provides electrical isolation between the load end and the control end. This effectively avoids interference and damage to the control circuit from the high-voltage, high-current load circuit, thereby improving the safety and stability of the entire circuit system.

[0102] 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 temperature display controller, applied to refrigeration equipment, characterized in that, include: A power supply circuit, the input terminal of which is connected to the mains power supply, is used to provide operating power to the temperature display controller; A temperature acquisition circuit, wherein the power supply terminal of the temperature acquisition circuit is connected to the output terminal of the power supply circuit, and the temperature acquisition circuit is used to acquire the cabinet temperature and the item temperature in real time. The main control circuit is connected to the output terminal of the temperature acquisition circuit. The main control circuit is used to output a high temperature alarm signal if the cabinet temperature is greater than the preset high temperature alarm value or less than the preset low temperature alarm value, and output a low temperature alarm signal if the cabinet temperature is less than the preset low temperature alarm value. The main control circuit is also used to output a high temperature alarm signal if the temperature of the item is greater than the preset high temperature alarm value or less than the preset low temperature alarm value, and output a low temperature alarm signal if the temperature of the item is less than the preset low temperature alarm value. A temperature display alarm circuit is provided, the input terminal of which is connected to the control terminal of the main control circuit. The temperature display alarm circuit is used to issue a high temperature alarm signal and display the current temperature value and alarm type when it receives a high temperature alarm signal from the cabinet or a high temperature alarm signal from the item. The temperature display alarm circuit is also used to issue a low temperature alarm and display the current temperature value and alarm type when it receives a low temperature alarm signal from the cabinet or a low temperature alarm signal from the item.

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

3. A temperature display controller according to claim 2, characterized in that, The temperature acquisition circuit includes: The cabinet temperature acquisition module has its input terminal electrically connected to the cabinet temperature probe and its output terminal connected to the cabinet temperature acquisition signal terminal of the main control circuit. The cabinet temperature acquisition module is used to acquire the current cabinet temperature in real time. The item temperature acquisition module has an input terminal electrically connected to a temperature sensing probe and an output terminal connected to the item temperature acquisition signal terminal of the main control circuit. The item temperature acquisition module is used to acquire the current temperature of the item in real time.

4. A temperature display controller according to claim 3, characterized in that, The cabinet temperature acquisition module includes a cabinet temperature probe interface J1, a capacitor C13, a resistor R33, and a resistor R34. The signal output terminal of the cabinet temperature probe interface J1 is connected to one end of the capacitor C13, the other end of the capacitor C13 is connected to one end of the resistor R34, and the other end of the resistor R34 is connected to the cabinet temperature acquisition signal terminal of the main control circuit. The resistor R33 is connected between the ground terminal of the cabinet temperature probe interface J1 and ground.

5. A temperature display controller according to claim 3, characterized in that, The item temperature acquisition module includes a temperature probe interface J3, a capacitor C12, a resistor R5, and a resistor R12. The signal output terminal of the temperature probe interface J3 is connected to one end of the capacitor C12, the other end of the capacitor C12 is connected to one end of the resistor R5, and the other end of the resistor R5 is connected to the item temperature acquisition signal terminal of the main control circuit. The ground terminal of the temperature probe interface J3 is connected to ground via the resistor R12.

6. A temperature display controller according to claim 2, characterized in that, The temperature display alarm circuit includes: An alarm module is provided, the input terminal of which is connected to the alarm control terminal of the main control circuit. The alarm module is used to execute a high temperature alarm when it receives a high temperature alarm signal from the cabinet or a high temperature alarm signal from the item. The alarm module is also used to execute a low temperature alarm when it receives a low temperature alarm signal from the cabinet or a low temperature alarm signal from the item. The display module has its input terminal connected to the display control terminal of the main control circuit. When the display module receives a high temperature alarm signal or a low temperature alarm signal, it displays the current temperature and current alarm type of the cabinet. The display module is also used to display the current temperature and current alarm type of the item when it receives a high temperature alarm signal or a low temperature alarm signal.

7. A temperature display controller according to claim 6, characterized in that, The alarm module includes: The drive unit has its alarm signal input terminal connected to the alarm control terminal of the main control circuit. A buzzer, the power supply terminal of which is connected to the output terminal of the first step-down module, and the signal input terminal of which is connected to the alarm signal output terminal of the drive unit.

8. A temperature display controller according to claim 6, characterized in that, The display module includes: A temperature display unit, the input terminal of which is connected to the first display control terminal of the main control circuit, is used to display the current cabinet temperature or the current item temperature; An alarm type display unit is provided, the input terminal of which is connected to the second display control terminal of the main control circuit. The alarm type display unit is used to display the alarm type of the cabinet temperature or the alarm type of the item temperature.

9. A temperature display controller according to claim 7, characterized in that, The power supply circuit also includes: A battery power supply module is provided to provide backup power for the temperature display controller.

10. A temperature display controller according to claim 2, characterized in that, Also includes: The mains power detection circuit has its input terminal connected to the detection signal terminal of the rectifier module and its output terminal connected to the detection signal feedback terminal of the main control circuit. The mains power detection circuit is used to output an alarm signal for abnormal mains power when it detects that the mains power supply is disconnected.

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