Temperature detection circuit and refrigerator
By combining a thermocouple with a temperature detection module and a voltage divider unit, the problem of insufficient temperature detection accuracy in refrigerators is solved, achieving stable and precise control of the internal temperature of the refrigerator and ensuring the continuity and accuracy of the refrigeration system.
Patent Information
- Application Number
- CN202520305120.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-24
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2035-02-24
AI Technical Summary
Existing refrigerator temperature detection technology lacks accuracy, making it difficult to achieve stable and precise control of the refrigerator's internal temperature.
The temperature detection circuit employs a thermocouple combined with a temperature detection module, a voltage divider unit, an amplification module, and a controller. The thermocouple rapidly senses temperature changes, and the voltage divider unit and amplification module improve detection accuracy. The controller then calculates the temperature value.
It improves the accuracy of refrigerator temperature detection, ensures the continuity of the refrigeration system and the precision of temperature control, and achieves stable control of the internal temperature of the refrigerator.
Smart Images
Figure CN223691885U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of electronics, in particular to a temperature detection circuit and a refrigerator. BACKGROUND
[0002] A refrigerator is a household appliance that lowers the internal temperature through a refrigeration system to keep food fresh. Its working principle is based on the refrigeration cycle, mainly through the phase change of the refrigerant (conversion between liquid and gas) to absorb and release heat, so as to achieve the purpose of reducing the temperature inside the refrigerator.
[0003] Therefore, it is necessary to detect the temperature inside the refrigerator to ensure stable and accurate control of the temperature inside the refrigerator.
[0004] Therefore, the current technology still needs to be improved and improved. INVENTION CONTENTS
[0005] The present application provides a temperature detection circuit and a refrigerator, which can effectively detect the temperature inside the refrigerator.
[0006] The present application provides a temperature detection circuit, which comprises:
[0007] A thermocouple;
[0008] A temperature detection module, the temperature detection module comprises a measurement connection end, a reference connection end, a detection unit and a voltage dividing unit; the detection unit is connected with the measurement connection end, and the voltage dividing unit is connected with the reference connection end; the measurement connection end is used for connecting with the hot end of the thermocouple, and the reference connection end is used for connecting with the cold end of the thermocouple; the detection unit and the voltage dividing unit are used for forming a circuit path with the thermocouple when the thermocouple is connected;
[0009] A controller, the controller is connected with the measurement connection end and the voltage dividing unit respectively; the controller is used for acquiring the resistance value of the thermocouple according to the voltage value of the measurement connection end and the voltage value output by the voltage dividing unit when the thermocouple is connected, and acquiring the corresponding temperature value according to the resistance value.
[0010] In some embodiments, the temperature detection circuit further comprises a reference voltage module, the reference voltage module is connected with the detection unit and the voltage dividing unit respectively; the reference voltage module is used for providing a reference voltage for the detection unit and the voltage dividing unit.
[0011] In some embodiments, the temperature detection circuit further comprises an amplification module, the amplification module is connected with the measurement connection end, the voltage dividing unit and the controller respectively; the amplification module is used for amplifying the voltage value of the measurement connection end and the voltage value output by the voltage dividing unit, and then outputting a detection voltage to the controller.
[0012] The temperature detection circuit in some embodiments, the detection unit includes a first resistor, one end of the first resistor is connected to the power supply, and the other end of the first resistor is connected to the measurement connection end.
[0013] The temperature detection circuit in some embodiments, the voltage dividing unit includes a second resistor and a third resistor, one end of the second resistor is connected to the power supply, the other end of the second resistor is connected to one end of the third resistor, the other end of the third resistor is connected to the reference connection end, and the other end of the second resistor is also connected to the amplification module.
[0014] The temperature detection circuit in some embodiments, the reference voltage module includes a fourth resistor, a fifth resistor and a voltage stabilizer, one end of the fourth resistor is connected to the power supply, the other end of the fourth resistor is connected to one end of the fifth resistor and the reference end of the voltage stabilizer, the other end of the fifth resistor and the anode of the voltage stabilizer are grounded, and the cathode of the voltage stabilizer is connected to the power supply.
[0015] The temperature detection circuit in some embodiments, the amplification module includes a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and an operational amplifier, one end of the sixth resistor is connected to the other end of the second resistor, the other end of the sixth resistor and one end of the eighth resistor are both connected to the inverting input terminal of the operational amplifier, one end of the seventh resistor is connected to the measurement connection end, the other end of the seventh resistor and one end of the ninth resistor are both connected to the non-inverting input terminal of the operational amplifier, and the output terminal of the operational amplifier.
[0016] The temperature detection circuit in some embodiments, the temperature detection circuit further includes a filtering module, the filtering module is connected to the reference voltage module, and the filtering module is used for filtering the input power supply and outputting to the reference voltage module.
[0017] The temperature detection circuit in some embodiments, the filtering module includes a first capacitor and a second capacitor, one end of the first capacitor and one end of the second capacitor are both connected to the power supply, and the other end of the first capacitor and the other end of the second capacitor are both grounded.
[0018] The embodiments of the present application also provide a refrigerator, which includes the temperature detection circuit as described above.
[0019] The temperature detection circuit and the refrigerator provided by the present application can rapidly sense temperature changes, have good filtering effect on slowly changing measured parameters, use thermocouples for temperature detection of the refrigerator, improve detection accuracy, and ensure continuous refrigeration and temperature control accuracy of the refrigerator. BRIEF DESCRIPTION OF DRAWINGS
[0020] The technical solutions and other beneficial effects of the present application will become apparent through the following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings.
[0021] Figure 1A first structural block diagram of a temperature detection circuit provided by an embodiment of the present application.
[0022] Figure 2 A second structural block diagram of a temperature detection circuit provided by an embodiment of the present application.
[0023] Figure 3 A circuit structural diagram of a temperature detection circuit provided by an embodiment of the present application. DETAILED DESCRIPTION
[0024] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person skilled in the art without creative work fall within the protection scope of the present application.
[0025] In addition, the terms "first", "second" are only for description purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features, so that the features with "first" and "second" can explicitly or implicitly include one or more features, and in the description of the present application, the meaning of "multiple" is two or more than two, unless otherwise explicitly and specifically limited.
[0026] Please refer to Figure 1 The embodiment of the present application provides a temperature detection circuit, which comprises a thermocouple 100, a temperature detection module 200 and a controller 300, the temperature detection module 200 comprises a measurement connection end A, a reference connection end B, a detection unit 210 and a voltage dividing unit 220.
[0027] In specific implementation, the detection unit 210 is connected with the measurement connection end A, the voltage dividing unit 220 is connected with the reference connection end B, the measurement connection end A is used to be connected with a hot end (PT_1 end in the embodiment) of the thermocouple 100, and the reference connection end B is used to be connected with a cold end (PT_2 end in the embodiment) of the thermocouple 100; the detection unit 210 and the voltage dividing unit 220 are used to form a circuit path with the thermocouple 100 when the thermocouple 100 is connected; the controller 300 is connected with the measurement connection end A and the voltage dividing unit 220 respectively, and the controller 300 is used to acquire a resistance value of the thermocouple 100 according to a voltage value of the measurement connection end A and a voltage value output by the voltage dividing unit 220 when the thermocouple 100 is connected, and acquire a corresponding temperature value according to the resistance value.
[0028] In the present application, the thermocouple 100 can measure a wide range of extremely low and extremely high temperatures, and can quickly respond to temperature changes. The thermocouple 100 has good filtering effect on measured parameters with slow temperature changes. When the thermocouple 100 is used for temperature detection of a refrigerator, the detection accuracy can be improved, thereby ensuring continuous refrigeration and temperature control accuracy of the refrigerator.
[0029] Please refer to Figure 2 In some embodiments, the temperature detection circuit further comprises a reference voltage module 400 connected with the detection unit 210 and the voltage dividing unit 220, respectively. The reference voltage module 400 is configured to provide a reference voltage for the detection unit 210 and the voltage dividing unit 220. The reference voltage module 400 and the ground terminal C of the thermocouple are both grounded. In the present embodiment, the reference voltage module 400 is connected to a first power supply and converts the first power supply to output a second power supply as a reference power supply to provide power for the temperature detection module 200, thereby ensuring normal operation of the temperature detection module 200. The first power supply can be 5V, and the second power supply can be 3V.
[0030] In some embodiments, the temperature detection circuit further comprises an amplification module 500 connected with the measurement connection end A, the voltage dividing unit 220 and the controller 300, respectively. The amplification module 500 is configured to amplify the voltage value of the measurement connection end A and the voltage value output by the voltage dividing unit 220, and then output a detection voltage to the controller 300. When the thermocouple 100 is connected to the temperature detection module 200, the voltage value V1 of the measurement connection end A and the voltage value V2 output by the voltage dividing unit 220 are obtained. According to V1 and V2, a differential signal is obtained. The differential signal is an mV level differential signal. In order to improve the reliability of detection, the differential signal is amplified by the amplification module 500, and then a detection voltage is output to the controller 300, so as to obtain the corresponding temperature value.
[0031] Please refer to Figure 3As an embodiment, the detection unit 210 comprises a first resistor R1, one end of the first resistor R1 is connected to electricity, and the other end of the first resistor R1 is connected to the measurement connection end A. The voltage dividing unit 220 comprises a second resistor R2 and a third resistor R3, one end of the second resistor R2 is connected to electricity, the other end of the second resistor R2 is connected to one end of the third resistor R3, the other end of the third resistor R3 is connected to the reference connection end B, and the other end of the second resistor R2 is also connected to the amplification module 500. When the measurement connection end A is connected to the hot end of the thermocouple 100, and the reference connection end B is connected to the cold end of the thermocouple 100, the first resistor R1, the second resistor R2, the third resistor R3 and the two connection ends form a measurement bridge, the resistance value of the first resistor R1 is the same as the resistance value of the second resistor R2, and when the resistance value of the measurement connection end A is not equal to the resistance value of the third resistor R3, the measurement bridge outputs a mV-level voltage difference signal, which is amplified by the amplification module 500 and then output to the controller 300, so as to obtain the corresponding temperature value.
[0032] As an embodiment, the reference voltage module 400 comprises a fourth resistor R4, a fifth resistor R5 and a voltage stabilizer U1, one end of the fourth resistor R4 is connected to electricity, the other end of the fourth resistor R4 is connected to one end of the fifth resistor R5 and the reference end of the voltage stabilizer U1, the other end of the fifth resistor R5 and the anode of the voltage stabilizer U1 are grounded, and the cathode of the voltage stabilizer U1 is connected to electricity. In this embodiment, the fourth resistor R4, the fifth resistor R5 and the voltage stabilizer U1 form the reference voltage module 400 for generating a reference voltage to ensure the stable operation of the temperature detection module 200.
[0033] As an embodiment, the amplification module 500 comprises a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9 and an operational amplifier OP1, one end of the sixth resistor R6 is connected to the other end of the second resistor R2, the other end of the sixth resistor R6 and one end of the eighth resistor R8 are both connected to the inverting input terminal of the operational amplifier OP1, one end of the seventh resistor R7 is connected to the measurement connection end A, the other end of the seventh resistor R7 and one end of the ninth resistor R9 are both connected to the non-inverting input terminal of the operational amplifier OP1, and the output terminal of the operational amplifier OP1. Among them, the resistance value of the eighth resistor R8 is equal to the resistance value of the ninth resistor R9, the resistance value of the sixth resistor R6 is equal to the resistance value of the seventh resistor R7, and the amplification factor of the amplification module 500 is the ratio of the resistance value of the eighth resistor R8 to the resistance value of the sixth resistor R6.
[0034] Please continue to refer to Figure 3In some embodiments, the temperature detection circuit further comprises a filtering module 600, which is connected with the reference voltage module 400, and is configured to filter the input power, i.e., the first power such as 5V, and then output the filtered first power to the reference voltage module 400, so as to improve the stability and reliability of the first power.
[0035] As an embodiment, the filtering module 600 comprises a first capacitor C1 and a second capacitor C2, one end of the first capacitor C1 and one end of the second capacitor C2 are connected to the power supply, and the other end of the first capacitor C1 and the other end of the second capacitor C2 are connected to the ground. The first capacitor C1 and the second capacitor C2 are used as filtering capacitors to filter the input first power, so as to effectively improve the stability and reliability of the first power.
[0036] In the embodiment, the voltage collected by the controller 300, i.e., the detection voltage, is Uo, Uo=(V1-V2)*(R8 / R6)=20*(V1-V2), i.e., V1=[Uo+20*V2)] / 20, and the first formula is obtained according to the resistance voltage division: V2≈108.434mV and V1=(Uo+2168.68) / 20, and the corresponding V1=Rpt / (R1+Rpt)*3000mV, so the second formula is obtained: Rpt=2000*V1 / (3000-V1), and the resistance value of the thermocouple 100, i.e., Rpt, is obtained according to the first formula and the second formula, and the controller 300 obtains the corresponding temperature value according to the resistance value, thereby realizing the temperature detection function.
[0037] The embodiment of the present application also provides a refrigerator, which comprises the temperature detection circuit described above, and since the temperature detection circuit is described in detail above, no further description is given here.
[0038] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.
[0039] The temperature detection circuit provided by the embodiments of the present application is described in detail above, and the principles and implementation manners of the present application are described by using specific examples in this paper, and the above embodiment descriptions are only used to help understand the technical solutions and core ideas of the present application; those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A temperature detection circuit, characterized by comprising: The temperature detection circuit comprises: a thermocouple; a temperature detection module comprising a measurement connection end, a reference connection end, a detection unit and a voltage division unit; the detection unit is connected with the measurement connection end, and the voltage division unit is connected with the reference connection end; the measurement connection end is used for connecting with the hot end of the thermocouple, and the reference connection end is used for connecting with the cold end of the thermocouple; the detection unit and the voltage division unit are used for forming a circuit path with the thermocouple when the thermocouple is connected; a controller connected with the measurement connection end and the voltage division unit respectively; the controller is used for acquiring the resistance value of the thermocouple according to the voltage value of the measurement connection end and the voltage value output by the voltage division unit when the thermocouple is connected, and acquiring the corresponding temperature value according to the resistance value.
2. The temperature detection circuit according to claim 1, characterized by, The temperature detection module further comprises a reference voltage module connected with the detection unit and the voltage division unit respectively; the reference voltage module is used for providing reference voltage for the detection unit and the voltage division unit.
3. The temperature detection circuit according to claim 2, wherein The temperature detection circuit further comprises an amplification module connected with the measurement connection end, the voltage division unit and the controller respectively; the amplification module is used for amplifying the voltage value of the measurement connection end and the voltage value output by the voltage division unit, and then outputting the detection voltage to the controller.
4. The temperature detection circuit according to claim 2, wherein The detection unit comprises a first resistor, one end of which is connected with electricity, and the other end of which is connected with the measurement connection end.
5. The temperature detection circuit according to claim 3, wherein The voltage division unit comprises a second resistor and a third resistor, one end of the second resistor is connected with electricity, the other end of the second resistor is connected with one end of the third resistor, the other end of the third resistor is connected with the reference connection end, and the other end of the second resistor is also connected with the amplification module.
6. The temperature detection circuit according to claim 5, wherein The reference voltage module comprises a fourth resistor, a fifth resistor and a voltage stabilizer, one end of the fourth resistor is connected with electricity, the other end of the fourth resistor is connected with one end of the fifth resistor and the reference end of the voltage stabilizer, the other end of the fifth resistor and the anode of the voltage stabilizer are grounded, and the cathode of the voltage stabilizer is connected with electricity.
7. The temperature detection circuit according to claim 5, wherein The amplification module comprises a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and an operational amplifier, one end of the sixth resistor is connected with the other end of the second resistor, the other end of the sixth resistor and one end of the eighth resistor are both connected with the inverting input end of the operational amplifier, one end of the seventh resistor is connected with the measurement connection end, the other end of the seventh resistor and one end of the ninth resistor are both connected with the non-inverting input end of the operational amplifier, and the output end of the operational amplifier.
8. The temperature detection circuit according to any one of claims 2 to 7, characterized by, The temperature detection circuit further comprises a filtering module connected with the reference voltage module, the filtering module is used for filtering the input power supply and then outputting to the reference voltage module.
9. The temperature detection circuit according to claim 8, wherein The filtering module comprises a first capacitor and a second capacitor, one end of the first capacitor and one end of the second capacitor are both connected with electricity, and the other end of the first capacitor and the other end of the second capacitor are both grounded.
10. A refrigerator characterized by comprising: The refrigerator comprises the temperature detection circuit according to any one of claims 1-9.