Ice-making temperature detection circuit, PCB and ice maker thereof

Abstract

The utility model discloses a kind of ice-making temperature detection circuit, PCB and ice maker thereof, including main control unit, water supply water tank temperature detection unit and ice-making environment temperature detection unit, the main control unit is electrically connected with the water supply water tank temperature detection unit and the ice-making environment temperature detection unit respectively;The water supply water tank temperature detection unit is used to detect the water temperature signal in water supply water tank;The ice-making environment temperature detection unit is used to detect the environmental temperature signal in ice-making cavity;The main control unit is used to send modulated signal to external refrigeration valve according to water temperature signal and environmental temperature signal;By detecting water supply water temperature and ice-making environment temperature, accurately adjust refrigeration capacity, refrigerate only when needed, effectively reduce energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of electronic circuit technology, and in particular to an ice-making temperature detection circuit, a PCB board, and an ice maker thereof. Background Technology

[0002] Currently, ice makers consume a relatively high amount of energy during operation. Their ice-making process is usually carried out according to a pre-set time period, and there is little industrial control of the ice-making process in conjunction with water temperature or external ambient temperature.

[0003] It is evident that existing technologies still need improvement and enhancement. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide an ice-making temperature detection circuit, which can accurately adjust the cooling capacity by detecting the water supply temperature and the ice-making environment temperature, and cool only when needed, thus effectively reducing energy consumption.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An ice-making temperature detection circuit includes a main control unit, a water supply tank temperature detection unit, and an ice-making ambient temperature detection unit. The main control unit is electrically connected to both the water supply tank temperature detection unit and the ice-making ambient temperature detection unit. The water supply tank temperature detection unit detects the water temperature signal in the water supply tank. The ice-making ambient temperature detection unit detects the ambient temperature signal in the ice-making chamber. The main control unit sends a modulation signal to an external refrigeration valve based on the water temperature signal and the ambient temperature signal.

[0007] In the ice-making temperature detection circuit, the main control unit includes a first control chip U1. Pins 21, 31 and 34 of the first control chip U1 are respectively connected to the water supply tank temperature detection unit, and pin 32 of the first control chip U1 is connected to the ice-making environment temperature detection unit.

[0008] In the ice-making temperature detection circuit, the water supply tank temperature detection unit includes a water tank detection section and an inlet / outlet water detection section. The water tank detection section is connected to pin 34 of the first control chip U1, and the inlet / outlet water detection section is connected to pins 21 and 31 of the first control chip U1, respectively. The water tank detection section is used to detect the water temperature in the water supply tank, and the inlet / outlet water detection section is used to detect the outlet water temperature and inlet water temperature at the inlet / outlet water pipes of the water supply tank.

[0009] The ice-making temperature detection circuit further includes a full ice detection unit, which is connected to pins 19 and 29 of the first control chip U1, respectively. The full ice detection unit is used to detect the ice quantity signal in the ice-making chamber.

[0010] In the ice-making temperature detection circuit, the water tank detection unit includes a first thermistor and a first voltage acquisition unit. One end of the first thermistor is connected to the input terminal of the first voltage acquisition unit, and the other end of the first thermistor is grounded. The output terminal of the first voltage acquisition unit is connected to pin 34 of the first control chip U1. The inlet / outlet water detection unit includes a second thermistor, a third thermistor, a second voltage acquisition unit, and a third voltage acquisition unit. One end of the second thermistor is connected to the input terminal of the second voltage acquisition unit, and the other end of the second thermistor is grounded. The output terminal of the second voltage acquisition unit is connected to pin 31 of the first control chip U1. One end of the third thermistor is connected to the input terminal of the third voltage acquisition unit, and the other end of the third thermistor is grounded. The output terminal of the third voltage acquisition unit is connected to pin 21 of the first control chip U1. The first thermistor is used to detect the water temperature in the water supply tank. The second thermistor is used to detect the inlet water temperature at the inlet of the water supply tank. The third thermistor is used to detect the outlet water temperature at the outlet of the water supply tank.

[0011] In the ice-making temperature detection circuit, the ice-making ambient temperature detection unit includes a fourth thermistor and a fourth voltage acquisition unit. One end of the fourth thermistor is connected to the input terminal of the fourth voltage acquisition unit, and the other end of the fourth thermistor is grounded. The output terminal of the fourth voltage acquisition unit is connected to pin 32 of the first control chip U1. The fourth thermistor is used to detect the ambient temperature signal in the ice-making cavity.

[0012] In the ice-making temperature detection circuit, the full ice detection unit includes an ice temperature detection unit and an ice position detection unit. The ice temperature detection unit is connected to pin 29 of the first control chip U1, and the ice position detection unit is connected to pin 19 of the first control chip U1. The ice temperature detection unit is used to detect the ice temperature signal of the ice in the ice-making cavity, and the ice position detection unit is used to detect the position signal of the ice in the ice-making cavity.

[0013] In the ice-making temperature detection circuit, the ice temperature detection unit includes a fifth thermistor and a fifth voltage acquisition unit. One end of the fifth thermistor is connected to the input terminal of the fifth voltage acquisition unit, and the other end of the fifth thermistor is grounded. The output terminal of the fifth voltage acquisition unit is connected to pin 29 of the first control chip U1. The ice position detection unit includes an infrared sensor, a sixth voltage acquisition unit, and a power input circuit. Pin 1 of the infrared sensor is connected to the power input circuit, pin 2 of the infrared sensor is grounded, and pin 3 of the infrared sensor is connected to pin 19 of the first control chip U1 through the fifth voltage acquisition unit. The fifth thermistor is used to detect the ice temperature signal of the ice in the ice-making cavity. The infrared sensor is used to detect the position signal of the ice in the ice-making cavity.

[0014] This application also provides a PCB board printed with the ice-making temperature detection circuit described above.

[0015] This application also provides an ice maker that uses the ice-making temperature detection circuit described above for operation control.

[0016] Beneficial effects:

[0017] This invention provides an ice-making temperature detection circuit. The circuit uses a water supply tank detection unit and an ice-making environment temperature detection unit to collect the water temperature signal in the water supply tank and the ambient temperature signal inside the ice-making chamber, respectively. Based on these two feedback signals, the system precisely adjusts the cooling capacity, outputting the required cooling capacity only when necessary. This method effectively solves the problem of excessive energy consumption caused by the fixed-time operation of traditional ice makers, ensuring both ice-making effect and energy saving. Attached Figure Description

[0018] Figure 1 A circuit block diagram of the ice-making temperature detection circuit provided by this utility model;

[0019] Figure 2 The circuit structure diagram of the main control unit in the ice-making temperature detection circuit provided by this utility model;

[0020] Figure 3 The circuit structure diagram of the water supply tank temperature detection unit in the ice-making temperature detection circuit provided by this utility model;

[0021] Figure 4 The circuit structure diagram of the ice-making environment temperature detection unit in the ice-making temperature detection circuit provided by this utility model;

[0022] Figure 5 The circuit structure diagram of the full ice detection unit in the ice-making temperature detection circuit provided by this utility model.

[0023] Explanation of main component symbols: 1-Main control unit, 2-Ice-making environment temperature detection unit, 3-Water supply tank temperature detection unit, 31-Water tank detection unit, 32-Inlet and outlet water detection unit, 4-Full ice detection unit, 41-Ice temperature detection unit, 42-Ice level detection unit. Detailed Implementation

[0024] This utility model provides an ice-making temperature detection circuit, a PCB board, and an ice maker thereof. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following describes this utility model in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0025] In the description of this utility model, it should be understood that the terms "first", "second", and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0026] Please see Figures 1 to 5 This invention provides an ice-making temperature detection circuit, including a main control unit 1, a water supply tank temperature detection unit 3, and an ice-making environment temperature detection unit 2. The main control unit 1 is electrically connected to both the water supply tank temperature detection unit and the ice-making environment temperature detection unit. The water supply tank temperature detection unit detects the water temperature signal in the water supply tank. The ice-making environment temperature detection unit 2 detects the ambient temperature signal in the ice-making cavity. The main control unit 1 sends a modulation signal to an external refrigeration valve based on the water temperature signal and the ambient temperature signal. Traditional ice makers operate at a fixed time regardless of the water temperature or ambient temperature, which can easily lead to over-cooling (such as operating at full load even in low-temperature environments). This application utilizes the water supply tank detection unit and the ice-making environment temperature detection unit 2 to collect the water temperature signal in the water supply tank and the ambient temperature signal in the ice-making cavity, respectively. The cooling capacity is adjusted based on these two feedback signals, outputting the required cooling capacity only when necessary. This effectively solves the problem of excessive energy consumption caused by the fixed-time operation of traditional ice makers, achieving energy saving and consumption reduction while ensuring ice-making effect.

[0027] The working principle of this application is as follows: The water supply tank temperature detection unit 3 is composed of temperature sensors (such as thermistors, thermocouples, etc.). The water supply tank temperature detection unit 3 is in direct contact with the water supply tank and converts the physical quantity of the water temperature in the tank into an electrical signal (such as a voltage or current signal). The ice-making environment temperature detection unit 2 is also composed of temperature sensors (such as thermistors, thermocouples, etc.) and is installed inside the ice-making cavity to collect the ambient temperature of the ice-making space and convert it into an electrical signal. When the main control unit 1 receives the water temperature signal and the ambient temperature signal, it will generate a modulation signal accordingly. After receiving the modulation signal output by the main control unit 1, the external refrigeration valve adjusts the refrigerant flow rate or supply time by changing the valve opening degree or the on / off state, thereby dynamically controlling the working intensity of the refrigeration system. When the water temperature or the ambient temperature is too high, the modulation signal will increase the opening degree of the refrigeration valve or prolong the opening time to enhance the refrigeration effect. When the water temperature is low or the ambient temperature is suitable, the modulation signal will decrease the valve opening degree or shorten the opening time to reduce the refrigeration power.

[0028] like Figures 1 to 5 As shown, the main control unit 1 further includes a first control chip U1. Pins 21, 31, and 34 of the first control chip U1 are respectively connected to the water supply tank temperature detection unit 3, and pin 32 of the first control chip U1 is connected to the ice-making environment temperature detection unit 2. The first control chip U1 uses pins 21, 31, and 34 to acquire the water temperature signal collected by the water supply tank temperature detection unit 3 (e.g., multi-point water temperature, with each pin receiving the water temperature signal from a different collection point). The first control chip U1 uses pin 32 to acquire the ambient temperature signal collected by the ice-making environment temperature detection unit 2. By receiving each temperature signal independently, the first control chip U1 avoids cross-interference of signal lines.

[0029] In this embodiment, the first control chip U1 is a control chip with model number CMS80F262A.

[0030] like Figures 1 to 5As shown, the water supply tank temperature detection unit 3 further includes a water tank detection unit 31 and an inlet / outlet water detection unit 32. The water tank detection unit 31 is connected to pin 34 of the first control chip U1, and the inlet / outlet water detection unit 32 is connected to pins 21 and 31 of the first control chip U1, respectively. The water tank detection unit 31 is used to detect the water temperature inside the water supply tank. The inlet / outlet water detection unit 32 is used to detect the outlet water temperature and inlet water temperature at the inlet / outlet water pipes of the water supply tank. The water tank detection unit 31 is installed inside the water supply tank (such as in the middle or bottom of the tank) to collect the real-time temperature of the entire water body inside the tank. Its output temperature signal is transmitted to pin 34 of the first control chip U1 to receive continuously changing water temperature electrical signals. The inlet / outlet water detection unit 32 is installed at the inlet and outlet pipes of the water supply tank, respectively. The inlet / outlet water detection unit 32 detects the initial temperature of newly injected water (such as the temperature of tap water when it first enters the tank) and the real-time temperature of water flowing into the ice-making chamber in real time. Traditional water temperature detection typically only measures the overall temperature of the water tank, ignoring the impact of sudden changes in inlet water temperature. This application, however, monitors the outlet temperature to directly determine the water temperature flowing into the ice-making chamber, ensuring that the water entering the ice-making process meets optimal conditions and reducing additional cooling consumption within the chamber. When the inlet water temperature is low (e.g., close to freezing point), the main control unit 1 can reduce the workload of the cooling valve in advance based on the inlet temperature signal, preventing over-cooling of the low-temperature water. Conversely, if the inlet water temperature is too high, the ice-making cycle can be shortened, reducing ineffective energy consumption. The water circulation status is determined based on the temperature difference between the inlet and outlet water: if the difference is too small (e.g., the outlet water temperature is close to the tank temperature), the water circulation is efficient, and cooling can proceed according to the conventional strategy; if the difference is too large (e.g., the outlet water temperature is much lower than the tank temperature), localized icing may occur. In this case, adjusting the cooling valve can reduce localized overcooling and decrease energy waste.

[0031] like Figures 1 to 5 As shown, the ice-making temperature detection circuit further includes a full ice detection unit 4, which is connected to pins 19 and 29 of the first control chip U1. The full ice detection unit 4 is used to detect the ice quantity signal in the ice-making cavity. The full ice detection unit 4 is typically composed of an ice quantity sensor (such as an infrared sensor, mechanical contact sensor, ultrasonic sensor, etc.) and a sampling circuit. It is installed at a preset full ice position in the ice-making cavity (such as the top of the cavity or a side wall at a specific height). By detecting the position signal of the ice cubes, it determines whether the amount of ice in the ice-making cavity has reached the full ice state. Traditional ice makers may continue to run for a fixed period of time even if the ice-making cavity is full, causing the refrigeration system to run idle when there is no demand. However, the full ice detection unit 4, by providing real-time feedback on the ice quantity, enables the main control unit 1 to immediately stop refrigeration when the ice is full, fundamentally eliminating this ineffective energy consumption.

[0032] like Figures 1 to 5As shown, the water tank detection unit 31 further includes a first thermistor and a first voltage acquisition unit. One end of the first thermistor is connected to the input terminal of the first voltage acquisition unit, and the other end of the first thermistor is grounded. The output terminal of the first voltage acquisition unit is connected to pin 34 of the first control chip U1. The inlet / outlet water detection unit 32 includes a second thermistor, a third thermistor, a second voltage acquisition unit, and a third voltage acquisition unit. One end of the second thermistor is connected to the input terminal of the second voltage acquisition unit, and the other end of the second thermistor is grounded. The output terminal of the second voltage acquisition unit is connected to pin 31 of the first control chip U1. One end of the third thermistor is connected to the input terminal of the third voltage acquisition unit, and the other end of the third thermistor is grounded. The output terminal of the third voltage acquisition unit is connected to pin 21 of the first control chip U1. The first thermistor is used to detect the water temperature in the water supply tank. The second thermistor is used to detect the inlet water temperature at the inlet of the water supply tank. The third thermistor is used to detect the outlet water temperature at the outlet of the water supply tank.

[0033] In this embodiment, the first, second, and third thermistors are negative temperature coefficient (NTC) thermistors, meaning their resistance decreases as the temperature rises and increases as the temperature falls. The first thermistor is installed inside the water supply tank and is in direct contact with the water. When the water temperature in the tank changes, its resistance changes synchronously with the temperature (e.g., resistance decreases as the water temperature rises and increases as the water temperature falls), converting the physical quantity of water temperature into a quantity of resistance change. The second thermistor is installed at the water inlet of the tank and is in direct contact with the incoming cold water. Its resistance change reflects the real-time status of the incoming water temperature (e.g., its resistance changes synchronously with the incoming water temperature when the tap water temperature fluctuates). The third thermistor is installed at the outlet of the water supply tank and comes into contact with the water flowing into the ice-making chamber. It reflects the dynamics of the water temperature through changes in resistance (for example, its resistance decreases accordingly when the outlet water temperature increases due to the ice-making cycle). The first voltage acquisition unit, the second voltage acquisition unit, and the third voltage acquisition unit respectively convert the resistance changes of the first thermistor, the second thermistor, and the third thermistor into voltage signals, and transmit the voltage signals to pins 34, 31, and 21 of the first control chip U1 in sequence.

[0034] In this embodiment, the first voltage acquisition unit includes a first resistor R1, a second resistor R2, and a third capacitor C3. One end of the first resistor R1 and the second resistor R2 are respectively connected to one end of the first thermistor. The other end of the first resistor R1 is connected to an external power supply. The other end of the second resistor R2 is connected to one end of the third capacitor C3 and pin 34 of the first control chip U1. The other end of the third capacitor C3 and the other end of the first thermistor are grounded. An RC sampling circuit is formed by the first resistor R1, the second resistor R2, and the third capacitor C3. The resistance value of the first thermistor is converted into a voltage signal using the voltage divider principle. The third capacitor C3 is used to filter the acquired voltage signal to improve the stability of the input signal. It should be noted that the circuit structures of the second and third voltage acquisition units are the same as those of the first voltage acquisition unit, and their working principles and specific structures are also the same, so they will not be described again here.

[0035] like Figures 1 to 5 As shown, the ice-making environment temperature detection unit further includes a fourth thermistor and a fourth voltage acquisition unit. One end of the fourth thermistor is connected to the input terminal of the fourth voltage acquisition unit, and the other end of the fourth thermistor is grounded. The output terminal of the fourth voltage acquisition unit is connected to pin 32 of the first control chip U1. The fourth thermistor is used to detect the ambient temperature signal in the ice-making cavity.

[0036] In this embodiment, the fourth thermistor, a negative temperature coefficient (NTC) thermistor, exhibits a significantly changing resistance value with variations in the ambient temperature of the ice-making chamber. When the ambient temperature rises, the resistance of the fourth thermistor decreases; conversely, when the ambient temperature decreases, its resistance increases. The fourth voltage acquisition unit primarily consists of a voltage divider circuit and a filter circuit. It converts the resistance change of the fourth thermistor into a voltage signal that can be recognized by the main control unit 1. The fourth thermistor, together with a fixed resistor, forms a voltage divider circuit connected to a stable DC power supply (e.g., 5V). As the thermistor's resistance changes with the ambient temperature, the voltage across it also changes, achieving a preliminary conversion from a resistance signal to a voltage signal.

[0037] It should be noted that the structure of the fourth voltage acquisition unit is the same as that of the first voltage acquisition unit, and the working principle and specific structure are also the same, so it will not be described again here.

[0038] like Figures 1 to 5As shown, the full ice detection unit 4 further includes an ice temperature detection unit 41 and an ice position detection unit 42. The ice temperature detection unit 41 is connected to pin 29 of the first control chip U1, and the ice position detection unit 42 is connected to pin 19 of the first control chip U1. The ice temperature detection unit 41 is used to detect the ice temperature signal of the ice in the ice-making chamber. The ice position detection unit 42 is used to detect the position signal of the ice in the ice-making chamber. By setting the ice temperature detection unit 41 and the ice position detection unit 42 to form a dual verification mechanism, the problem of easy misjudgment by single ice position detection is solved, and the accuracy and reliability of the full ice judgment of the ice maker are further improved.

[0039] The specific working principle is as follows: When the ice position signal in the ice-making chamber is high, and the corresponding temperature of the ice temperature signal is ≤ the preset temperature (e.g., -3℃), it is determined to be a true full ice state. The main control unit 1 sends a shut-off signal to the refrigeration valve to stop ice making. When the ice position signal in the ice-making chamber is high, but the corresponding temperature of the ice temperature signal is > the preset temperature (which may be due to water accumulation or thin ice), it is determined to be a false full ice state. The main control unit 1 continues to make ice and enhances refrigeration through the refrigeration valve to accelerate the freezing of water accumulation. When the ice position signal in the ice-making chamber is low, the ice temperature signal is not considered, and it is determined to be a state of incomplete ice. The main control unit 1 continues to control the refrigeration valve based on the water temperature and ambient temperature signals.

[0040] like Figures 1 to 5 As shown, further, the ice temperature detection unit 41 includes a fifth thermistor and a fifth voltage acquisition unit. One end of the fifth thermistor is connected to the input terminal of the fifth voltage acquisition unit, and the other end of the fifth thermistor is grounded. The output terminal of the fifth voltage acquisition unit is connected to pin 29 of the first control chip U1. The ice position detection unit 42 includes an infrared sensor, a sixth voltage acquisition unit, and a power input circuit. Pin 1 of the infrared sensor is connected to the power input circuit, pin 2 of the infrared sensor is grounded, and pin 3 of the infrared sensor is connected to pin 19 of the first control chip U1 through the fifth voltage acquisition unit. The fifth thermistor is used to detect the ice temperature signal of the ice in the ice-making chamber. The infrared sensor is used to detect the position signal of the ice in the ice-making chamber.

[0041] In this embodiment, the fifth thermistor is a negative temperature coefficient (NTC) thermistor, whose resistance increases as the ice temperature decreases. This resistor is directly installed at the preset position of the ice-filled cavity (such as the inner wall of the top of the cavity), in direct contact with the ice or sensing it at close range, accurately capturing the actual temperature of the ice. The fifth voltage acquisition unit mainly consists of a voltage divider circuit and a filter circuit. The fifth thermistor and the fixed resistor form a voltage divider circuit (connected to a 5V DC power supply). The change in resistance is converted into a change in the divided voltage. After being processed by the filter circuit (to eliminate electromagnetic interference inside the ice maker), a stable voltage signal is output.

[0042] In this embodiment, the infrared sensor includes a transmitter (infrared light-emitting diode) and a receiver (phototransistor), which are installed in pairs on both sides of the ice-making cavity at a preset ice height. When the ice block does not reach the full ice height, the infrared light emitted by the transmitter is not blocked, and the receiver conducts after receiving the light signal, outputting a low level. When the ice block accumulates to the full ice height, the infrared light is blocked by the ice block, the receiver has no signal input and is cut off, outputting a high level. Pin 1 of the infrared sensor is connected to the power input circuit (5V DC power supply) to power the sensor; pin 2 is grounded to form a power supply circuit. The high and low level signals (ice level signals) output by the infrared sensor are processed by the level conversion of the sixth voltage acquisition unit and transmitted to pin 19 of the first control chip U1 through pin 3.

[0043] It should be noted that the structures of the fifth and sixth voltage acquisition units are the same as those of the first voltage acquisition unit, and their working principles and specific structures are also the same, so they will not be described again here.

[0044] It should be noted that the power input circuit includes a DC power supply (such as a 5V DC power supply), a thirteenth resistor R13, a ninth capacitor C9, a tenth capacitor C10, and an eleventh capacitor C11; the ninth capacitor C9, the tenth capacitor C10, and the eleventh capacitor C11 form a filter capacitor group, one end of which is grounded, and the other end is connected to one end of the thirteenth resistor R13 and pin 1 of the infrared sensor, respectively. The other end of the thirteenth resistor R13 is connected to the DC power supply; the thirteenth resistor R13, the ninth capacitor C9, the tenth capacitor C10, and the eleventh capacitor C11 form an RC filter circuit to make the power signal input to the infrared sensor more stable.

[0045] This application also provides a PCB board printed with the ice-making temperature detection circuit described above.

[0046] This application also provides an ice maker that uses the ice-making temperature detection circuit described above for operation control.

[0047] In summary, this application uses a water supply tank detection unit and an ice-making environment temperature detection unit 2 to collect water temperature signals from the water supply tank and ambient temperature signals from the ice-making chamber, respectively. Based on these two feedback signals, the system precisely adjusts the cooling capacity, outputting the required cooling capacity only when necessary. This method effectively solves the problem of excessive energy consumption caused by the fixed-time operation of traditional ice makers, ensuring both ice-making effect and energy saving.

[0048] It is understood that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of this utility model, and all such substitutions or changes should fall within the protection scope of the appended claims of this utility model.

Claims

1. An ice-making temperature detection circuit, characterized in that, The system includes a main control unit, a water supply tank temperature detection unit, and an ice-making environment temperature detection unit. The main control unit is electrically connected to both the water supply tank temperature detection unit and the ice-making environment temperature detection unit. The water supply tank temperature detection unit is used to detect the water temperature signal in the water supply tank. The ice-making environment temperature detection unit is used to detect the ambient temperature signal in the ice-making chamber. The main control unit is used to send a modulation signal to an external refrigeration valve based on the water temperature signal and the ambient temperature signal.

2. The ice-making temperature detection circuit according to claim 1, characterized in that, The main control unit includes a first control chip U1. Pins 21, 31 and 34 of the first control chip U1 are respectively connected to the water supply tank temperature detection unit, and pin 32 of the first control chip U1 is connected to the ice-making environment temperature detection unit.

3. The ice-making temperature detection circuit according to claim 2, characterized in that, The water supply tank temperature detection unit includes a water tank detection section and an inlet / outlet water detection section. The water tank detection section is connected to pin 34 of the first control chip U1, and the inlet / outlet water detection section is connected to pins 21 and 31 of the first control chip U1, respectively. The water tank detection section is used to detect the water temperature in the water supply tank. The inlet / outlet water detection section is used to detect the outlet water temperature and inlet water temperature at the inlet and outlet water pipes of the water supply tank.

4. The ice-making temperature detection circuit according to claim 2, characterized in that, The ice-making temperature detection circuit also includes a full ice detection unit, which is connected to pin 19 and pin 29 of the first control chip U1, respectively. The full ice detection unit is used to detect the ice quantity signal in the ice-making chamber.

5. The ice-making temperature detection circuit according to claim 3, characterized in that, The water tank detection unit includes a first thermistor and a first voltage acquisition unit. One end of the first thermistor is connected to the input terminal of the first voltage acquisition unit, and the other end of the first thermistor is grounded. The output terminal of the first voltage acquisition unit is connected to pin 34 of the first control chip U1. The inlet and outlet water detection unit includes a second thermistor, a third thermistor, a second voltage acquisition unit, and a third voltage acquisition unit. One end of the second thermistor is connected to the input terminal of the second voltage acquisition unit, and the other end of the second thermistor is grounded. The output terminal of the second voltage acquisition unit is connected to pin 31 of the first control chip U1. One end of the third thermistor is connected to the input terminal of the third voltage acquisition unit, and the other end of the third thermistor is grounded. The output terminal of the third voltage acquisition unit is connected to pin 21 of the first control chip U1. The first thermistor is used to detect the water temperature in the water supply tank. The second thermistor is used to detect the inlet water temperature at the inlet of the water supply tank. The third thermistor is used to detect the outlet water temperature at the outlet of the water supply tank.

6. The ice-making temperature detection circuit according to claim 2, characterized in that, The ice-making environment temperature detection unit includes a fourth thermistor and a fourth voltage acquisition unit. One end of the fourth thermistor is connected to the input terminal of the fourth voltage acquisition unit, and the other end of the fourth thermistor is grounded. The output terminal of the fourth voltage acquisition unit is connected to pin 32 of the first control chip U1. The fourth thermistor is used to detect the ambient temperature signal in the ice-making cavity.

7. The ice-making temperature detection circuit according to claim 4, characterized in that, The full ice detection unit includes an ice temperature detection unit and an ice position detection unit. The ice temperature detection unit is connected to pin 29 of the first control chip U1, and the ice position detection unit is connected to pin 19 of the first control chip U1. The ice temperature detection unit is used to detect the ice temperature signal of the ice in the ice-making chamber. The ice position detection unit is used to detect the position signal of the ice in the ice-making chamber.

8. The ice-making temperature detection circuit according to claim 7, characterized in that, The ice temperature detection unit includes a fifth thermistor and a fifth voltage acquisition unit. One end of the fifth thermistor is connected to the input terminal of the fifth voltage acquisition unit, and the other end of the fifth thermistor is grounded. The output terminal of the fifth voltage acquisition unit is connected to pin 29 of the first control chip U1. The ice position detection unit includes an infrared sensor, a sixth voltage acquisition unit, and a power input circuit. Pin 1 of the infrared sensor is connected to the power input circuit, pin 2 of the infrared sensor is grounded, and pin 3 of the infrared sensor is connected to pin 19 of the first control chip U1 through the fifth voltage acquisition unit. The fifth thermistor is used to detect the ice temperature signal of the ice in the ice-making chamber. The infrared sensor is used to detect the position signal of the ice in the ice-making chamber.

9. A PCB board, characterized in that, The PCB board is printed with an ice-making temperature detection circuit as described in any one of claims 1-8.

10. An ice maker, characterized in that, The ice maker described herein uses the ice-making temperature detection circuit as described in any one of claims 1-8 for operation control.

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