Thermal resistor for power station temperature measurement

Abstract

The embodiment of the utility model discloses a thermal resistor for power station temperature measurement. Comprising a constant current source module, a platinum thermal resistor, a platinum thermal resistor temperature measurement module, an A / D conversion module, a control module and a display module which are sequentially connected, the platinum thermal resistor temperature measurement module comprises a first resistor, a second resistor and an operational amplification circuit, and the first end of the first resistor is connected with the first end of the platinum thermal resistor and the constant current source module; the second end of the first resistor is connected with the operational amplifier circuit, the first end of the second resistor is connected with the second end of the platinum thermistor and the grounding end, and the second end of the second resistor is connected with the operational amplifier circuit; according to the embodiment of the invention, the constant current source module provides a constant current power supply, the platinum thermal resistor is arranged to measure the temperature of a power station, the temperature analog signal is converted into a temperature digital signal through the A / D conversion module after the measured temperature signal is amplified through the operational amplifier, and the control module processes the temperature digital signal and then sends the temperature digital signal to the display module for display. The temperature measurement effect is good, and the measurement accuracy and precision are improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of thermal resistors, and in particular, to a thermal resistor for temperature measurement in power stations. Background Art

[0002] At present, the main method for temperature measurement in substations is to use an infrared thermometer for infrared temperature measurement. However, the ability of the infrared thermometer to measure the temperature of the equipment inside the switch cabinet is greatly limited. First, the glass observation window of the switch cabinet affects the infrared temperature measurement effect, and even using a special infrared temperature measurement glass observation window, the effect is not very ideal. Second, the structure inside the switch cabinet is compact, and some equipment is not easy to observe due to mutual occlusion, which further increases the difficulty of temperature measurement and greatly affects the accuracy of temperature measurement. Summary of the Utility Model

[0003] The embodiments of the present application provide a thermal resistor for temperature measurement in power stations to solve the problems of poor temperature measurement effect and low temperature measurement accuracy of the existing power station temperature measurement devices.

[0004] In a first aspect, the embodiments of the present application provide a thermal resistor for temperature measurement in power stations, which includes a constant current source module, a platinum thermal resistor, a platinum thermal resistor temperature measurement module, an A / D conversion module, a control module, and a display module connected in sequence. The platinum thermal resistor temperature measurement module includes a first resistor, a second resistor, and an operational amplifier circuit. The first end of the first resistor is connected to the first end of the platinum thermal resistor and the constant current source module, the second end of the first resistor is connected to the operational amplifier circuit, the first end of the second resistor is connected to the second end of the platinum thermal resistor and the ground terminal, the second end of the second resistor is connected to the operational amplifier circuit. The constant current source module is used to provide a constant current power supply for the platinum thermal resistor and the platinum thermal resistor temperature measurement module. The first resistor and the second resistor are used to adjust the gain of the temperature signal collected by the platinum thermal resistor. The operational amplifier circuit is used to amplify the temperature signal collected by the platinum thermal resistor, convert the temperature analog signal into a temperature digital signal through the A / D conversion module, and send it to the control module. The control module processes the temperature digital signal and sends it to the display module for display.

[0005] In some embodiments, the operational amplifier circuit includes a first operational amplifier, a second operational amplifier, a third resistor, a fourth resistor, and a first capacitor. The negative input terminal of the first operational amplifier is connected to the second terminal of the first resistor, the first terminal of the third resistor, and the first terminal of the first capacitor. The positive input terminal of the first operational amplifier is connected to the second terminal of the second resistor, the first terminal of the fourth resistor, and the output terminal of the second operational amplifier. The output terminal of the first operational amplifier is connected to the second terminal of the third resistor, the second terminal of the first capacitor, and the A / D conversion module. The negative input terminal of the second operational amplifier is connected to the second terminal of the fourth resistor, and the positive input terminal of the second operational amplifier is connected to the ground terminal.

[0006] In some embodiments, the constant current source module includes a first amplifier chip, a second amplifier chip, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, and a third capacitor. The first pin of the first amplifier chip is connected to the third pin, the first terminal of the sixth resistor, and the first terminal of the seventh resistor. The second pin is connected to the first terminal of the eighth resistor and the first terminal of the ninth resistor. The first pin of the second amplifier chip is connected to the third pin and the second terminal of the ninth resistor. The second pin is connected to the second terminal of the seventh resistor and the first terminal of the platinum thermal resistor. The second terminal of the eighth resistor is connected to the power supply terminal and the first terminal of the third capacitor. The second terminal of the third capacitor and the second terminal of the sixth resistor are connected to the ground terminal.

[0007] In some embodiments, the power supply terminal is a reference power supply terminal.

[0008] In some embodiments, a rectifier filter circuit is further included, and the rectifier filter circuit is connected to the operational amplifier circuit and the A / D conversion module.

[0009] In some embodiments, the rectifier filter circuit includes a fifth resistor and a second capacitor. The first terminal of the fifth resistor is connected to the operational amplifier circuit. The second terminal of the fifth resistor is connected to the first terminal of the second capacitor and the A / D conversion module. The second terminal of the second capacitor is connected to the ground terminal.

[0010] In some embodiments, the model of the first operational amplifier is TL-022C.

[0011] In some embodiments, the model of the second operational amplifier is TL-060C.

[0012] In some embodiments, the model of the first amplifier chip is LM741.

[0013] In some embodiments, the model of the second amplifier chip is LM358.

[0014] The constant current source module in the embodiment of the present application provides a constant current power supply. A platinum thermal resistor is set for temperature measurement in the power station. The measured temperature signal is amplified by an operational amplifier and then converted into a temperature digital signal through an A / D conversion module. The control module processes the temperature digital signal and sends it to the display module for display. The temperature measurement effect is good, and the measurement accuracy and precision are improved. Brief Description of the Drawings

[0015] Figure 1 It is a schematic circuit structure diagram of a thermal resistor for temperature measurement in a power station provided by an embodiment of the present application. Detailed Embodiments

[0016] In order to make the objectives, technical solutions and advantages of the present application clearer, the following further describes the specific embodiments of the present application in detail with reference to the drawings. It can be understood that the specific embodiments described herein are only used to explain the present application, rather than limiting the present application. Additionally, it should be noted that for the convenience of description, only parts related to the present application rather than all contents are shown in the drawings. Before discussing the exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although the flowcharts describe the operations (or steps) as sequential processes, many of the operations can be implemented in parallel, concurrently or simultaneously. In addition, the order of the operations can be rearranged. When the operations are completed, the process can be terminated, but there may also be additional steps not included in the drawings. The process can correspond to a method, function, procedure, subroutine, subprogram, etc.

[0017] A thermal resistor for temperature measurement in a power station provided by an embodiment of the present application is provided to avoid the problems of poor temperature measurement effect and low temperature measurement accuracy in existing power station temperature measurement devices.

[0018] Figure 1 It is a schematic structure diagram of a thermal resistor for temperature measurement in a power station provided by an embodiment of the present application. Refer to Figure 1, the thermal resistance for power station temperature measurement includes a constant current source module, a platinum thermal resistance PT100, a platinum thermal resistance temperature measurement module, a rectifier filter circuit, an A / D conversion module, a control module, and a display module connected in sequence. The platinum thermal resistance temperature measurement module includes a first resistor R1, a second resistor R2, and an operational amplifier circuit. The first end of the first resistor R1 is connected to the first end of the platinum thermal resistance PT100 and the constant current source module. The second end of the first resistor R1 is connected to the operational amplifier circuit. The first end of the second resistor R2 is connected to the second end of the platinum thermal resistance PT100 and the ground terminal. The second end of the second resistor R2 is connected to the operational amplifier circuit. The constant current source module is used to provide a constant current power supply for the platinum thermal resistance PT100 and the platinum thermal resistance temperature measurement module. The first resistor R1 and the second resistor R2 are used to adjust the gain of the temperature signal collected by the platinum thermal resistance PT100. The operational amplifier circuit is used to amplify the temperature signal collected by the platinum thermal resistance PT100, convert the temperature analog signal into a temperature digital signal through the A / D conversion module, and send it to the control module. The control module processes the temperature digital signal and sends it to the display module for display.

[0019] Among them, the operational amplifier circuit includes a first operational amplifier D1, a second operational amplifier D2, a third resistor R3, a fourth resistor R4, and a first capacitor C1; the constant current source module includes a first amplifier chip U1, a second amplifier chip U2, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a third capacitor C3; the rectifier filter circuit includes a fifth resistor R5 and a second capacitor C2.

[0020] The negative input terminal of the first operational amplifier D1 is connected to the second terminal of the first resistor R1, the first terminal of the third resistor R3, and the first terminal of the first capacitor C1. The positive input terminal of the first operational amplifier D1 is connected to the second terminal of the second resistor R2, the first terminal of the fourth resistor R4, and the output terminal of the second operational amplifier D2. The output terminal of the first operational amplifier D1 is connected to the second terminal of the third resistor R3, the second terminal of the first capacitor C1, and the first terminal of the fifth resistor R5. The negative input terminal of the second operational amplifier D2 is connected to the second terminal of the fourth resistor R4, and the positive input terminal of the second operational amplifier D2 is connected to the ground terminal. The first pin of the first amplifier chip U1 is connected to the third pin, the first terminal of the sixth resistor R6, and the first terminal of the seventh resistor R7. The second pin is connected to the first terminal of the eighth resistor R8 and the first terminal of the ninth resistor R9. The first pin of the second amplifier chip U2 is connected to the third pin and the second terminal of the ninth resistor R9. The second pin is connected to the second terminal of the seventh resistor R7 and the first terminal of the platinum resistance thermometer PT100. The second terminal of the eighth resistor R8 is connected to the power supply terminal and the first terminal of the third capacitor C3. The second terminal of the third capacitor C3 and the second terminal of the sixth resistor R6 are connected to the ground terminal. The second terminal of the fifth resistor R5 is connected to the first terminal of the second capacitor C2 and the A / D conversion module, and the second terminal of the second capacitor C2 is connected to the ground terminal.

[0021] As a preferred embodiment, the power supply terminal is a reference power supply terminal Vref.

[0022] As described above, the constant current source module in the embodiment of the present application provides a constant current power supply, the platinum resistance thermometer PT100 is set to measure the temperature of the power station, the measured temperature signal is amplified by the operational amplifier and then converted into a temperature digital signal by the A / D conversion module, and the control module processes the temperature digital signal and sends it to the display module for display. The temperature measurement effect is good, and the accuracy and precision of the measurement are improved.

[0023] As a preferred embodiment, the model of the first operational amplifier D1 is TL-022C.

[0024] As a preferred embodiment, the model of the second operational amplifier D2 is TL-060C.

[0025] As a preferred embodiment, the model of the first amplifier chip U1 is LM741.

[0026] As a preferred embodiment, the model of the second amplifier chip U2 is LM358.

[0027] The above are only the preferred embodiments of the present application and the technical principles applied. The present application is not limited to the specific embodiments described herein. Various obvious changes, re-adjustments and substitutions that can be made by those skilled in the art will not depart from the protection scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments. Without departing from the concept of the present application, it may also include more other equivalent embodiments, and the scope of the present application is determined by the scope of the claims.

Claims

1. A thermal resistor for temperature measurement in a power station, characterized in that: The invention comprises a constant current source module, a platinum thermal resistor, a platinum thermal resistor temperature measurement module, an A / D conversion module, a control module and a display module connected in sequence. The platinum thermal resistor temperature measurement module comprises a first resistor, a second resistor and an operational amplifier circuit. The first end of the first resistor is connected to the first end of the platinum thermal resistor and the constant current source module, the second end of the first resistor is connected to the operational amplifier circuit, the first end of the second resistor is connected to the second end of the platinum thermal resistor and a ground terminal, the second end of the second resistor is connected to the operational amplifier circuit, the constant current source module is used to provide a constant current power supply for the platinum thermal resistor and the platinum thermal resistor temperature measurement module, the first resistor and the second resistor are used to perform gain adjustment on the temperature signal collected by the platinum thermal resistor, the operational amplifier circuit is used to amplify the temperature signal collected by the platinum thermal resistor, and then convert the temperature analog signal into a temperature digital signal through the A / D conversion module and send it to the control module, and the control module processes the temperature digital signal and sends it to the display module for display.

2. The thermal resistor for temperature measurement in a power station according to claim 1, characterized in that: The operational amplifier circuit includes a first operational amplifier, a second operational amplifier, a third resistor, a fourth resistor, and a first capacitor. The negative polarity input terminal of the first operational amplifier is connected to the second end of the first resistor, the first end of the third resistor, and the first end of the first capacitor. The positive polarity input terminal of the first operational amplifier is connected to the second end of the second resistor, the first end of the fourth resistor, and the output terminal of the second operational amplifier. The output terminal of the first operational amplifier is connected to the second end of the third resistor, the second end of the first capacitor, and the A / D conversion module. The negative polarity input terminal of the second operational amplifier is connected to the second end of the fourth resistor, and the positive polarity input terminal of the second operational amplifier is connected to the ground terminal.

3. The thermal resistor for temperature measurement in a power station according to claim 1, characterized in that: The constant current source module includes a first amplifier chip, a second amplifier chip, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and a third capacitor, wherein a first pin of the first amplifier chip is connected to a third pin, a first end of the sixth resistor and a first end of the seventh resistor, a second pin is connected to a first end of the eighth resistor and a first end of the ninth resistor, a first pin of the second amplifier chip is connected to a third pin and a second end of the ninth resistor, a second pin is connected to a second end of the seventh resistor and a first end of the platinum thermal resistor, a second end of the eighth resistor is connected to a power supply terminal and a first end of the third capacitor, and a second end of the third capacitor and a second end of the sixth resistor are connected to a ground terminal.

4. The thermal resistor for temperature measurement in a power station according to claim 3, characterized in that: The power supply terminal is a reference power supply terminal.

5. The thermal resistor for temperature measurement in a power station according to claim 1, characterized in that: It also includes a rectifier and filter circuit, which is connected to the operational amplifier circuit and the A / D conversion module.

6. The thermal resistor for temperature measurement in a power station according to claim 5, characterized in that: The rectification and filtering circuit includes a fifth resistor and a second capacitor, the first end of the fifth resistor is connected to the operational amplifier circuit, the second end of the fifth resistor is connected to the first end of the second capacitor and the A / D conversion module, and the second end of the second capacitor is connected to the ground.

7. The thermal resistor for temperature measurement in a power station according to claim 2, characterized in that: The model of the first operational amplifier is TL-022C.

8. The thermal resistor for temperature measurement in a power station according to claim 2, characterized in that: The model of the second operational amplifier is TL-060C.

9. The thermal resistor for temperature measurement in a power station according to claim 3, characterized in that: The model of the first amplifier chip is LM741.

10. The thermal resistor for temperature measurement in a power station according to claim 3, characterized in that: The model of the second amplifier chip is LM358.

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