CN-122016091-A - Thermal resistance simulation device and calibration method

Abstract

The application relates to the technical field of temperature sensors and discloses a thermal resistor simulation device and a calibration method, wherein the thermal resistor simulation device comprises a main control chip, the main control chip is respectively connected with a power control module, a digital potentiometer and a constant value resistor, the main control chip is respectively used for controlling the power control module and the digital potentiometer and simultaneously carrying out sampling analysis on the resistor of the digital potentiometer, the power control module is respectively connected with an external voltage-stabilizing power supply and a vernier end of the digital potentiometer, one end of the constant value resistor, which is connected with the main control chip, is simultaneously connected with a low potential end of the digital potentiometer, and the other end of the constant value resistor and the vernier end of the digital potentiometer are respectively analog output ends.

Inventors

• WANG RUIYANG
• ZHANG ZHILI
• ZHANG CHI
• SONG QINGFANG
• LI YUETIAN
• HAN ZHE

Assignees

• 唐山康成科技有限公司
• 天津中德应用技术大学

Dates

Publication Date

20260512

Application Date

20260326

Claims (5)

1. 1. The thermal resistor simulation device is characterized by comprising a main control chip, wherein the main control chip is respectively connected with a power control module, a digital potentiometer and a constant value resistor, the main control chip respectively controls the power control module and the digital potentiometer, meanwhile, samples and analyzes the resistor of the digital potentiometer, the power control module is respectively connected with an external stabilized power supply and the vernier end of the digital potentiometer, one end, connected with the main control chip, of the constant value resistor is simultaneously connected with the low potential end of the digital potentiometer, and the other end of the constant value resistor and the vernier end of the digital potentiometer are respectively analog output ends.
2. 2. A thermal resistance simulation device according to claim 1, wherein the power control module is a relay.
3. 3. The thermal resistance simulation device according to claim 1, wherein the number of the power supply control modules is plural, the plurality of I/O ports of the main control chip are respectively connected with the control ends of the plurality of power supply control modules, the plurality of power supply control modules are all connected with the external stabilized voltage power supply, the number of cursor ends of the digital potentiometer is matched with the number of the power supply control modules, and the cursor ends of the digital potentiometer are respectively connected with the corresponding power supply control modules.
4. 4. A thermal resistor simulation device and calibration method according to claim 3, wherein the number of the digital potentiometers and the fixed resistors are plural, the number of the digital potentiometers is matched with the number of the fixed resistors, and the plural digital potentiometers are respectively connected with the corresponding fixed resistors.
5. 5. A method of calibrating a thermal resistor simulation apparatus, comprising the steps of: s1, a power supply control module is connected with an external stabilized voltage power supply, a thermal resistance simulation device is connected with a power supply, and a main control chip outputs an opening control signal to the power supply control module so that the power supply control module is communicated; S2, controlling the digital potentiometer to be adjusted to a minimum resistance value through a main control chip, and sampling through the main control chip; S3, controlling the digital potentiometer to adjust to a full-scale resistance value through the main control chip, and sampling through the main control chip; s4, calculating to obtain the unit change resistance of the digital potentiometer according to the full-scale resistance, the internal resistance and the maximum order of the digital potentiometer; s5, outputting a turn-off control signal to the power control module through the main control chip to disconnect the power control module; S6, according to the unit change resistance value and the internal resistance value of the digital potentiometer, the resistance value of the thermal resistor changing at each degree centigrade and the resistance value of the fixed-value resistor, and the relation between the resistance value and the temperature value of the analog device is obtained.

Description

Thermal resistance simulation device and calibration method Technical Field The application relates to the technical field of temperature sensors, in particular to a thermal resistance simulation device and a calibration method. Background PT1000 is a thermal resistor with resistance value increasing with temperature, PT1000 has resistance value of 1000Ω at 0deg.C, resistance value of 921.599 Ω at-20deg.C, resistance value of 1385.055 Ω at 100deg.C, and measurement range between-50deg.C and 300deg.C. A composite temperature sensor is often used in the axle temperature alarm of the railway carriage to collect the temperature of the bearing, wherein the composite temperature sensor comprises an analog temperature sensor and a digital temperature sensor, and the analog temperature sensor is PT1000. The temperature of the bearing is difficult to realize in the testing environment of the shaft temperature alarm, namely, the temperature is higher than 100 ℃ and lower than-20 ℃, so that a digital potentiometer is used for simulating the resistance value of PT1000 at the temperature higher than 100 ℃ and lower than-20 ℃, and the shaft temperature alarm test of the bearing temperature in the measuring range of PT1000 platinum thermal resistance is completed instead of a simulated temperature sensor PT 1000. Due to the problem of the production process of the digital potentiometer, the full-scale resistance value of the device can deviate, if the device is not calibrated before being used, the device has great error in use, and the actual output resistance value of the digital potentiometer is inconsistent with the expected resistance value. Disclosure of Invention The application aims to provide a thermal resistance simulation device and a calibration method, which have the advantages of wide adjustable range of resistance, automatic calibration, simple circuit and compact structure. In order to achieve the above purpose, the present invention adopts the following technical scheme: The invention discloses a thermal resistor simulation device and a calibration method, wherein the thermal resistor simulation device comprises a main control chip, the main control chip is respectively connected with a power control module, a digital potentiometer and a constant value resistor, the main control chip respectively controls the power control module and the digital potentiometer, meanwhile, samples and analyzes the resistor of the digital potentiometer, the power control module is respectively connected with an external stabilized power supply and a vernier end of the digital potentiometer, one end of the constant value resistor, which is connected with the main control chip, is simultaneously connected with a low potential end of the digital potentiometer, and the other end of the constant value resistor and the vernier end of the digital potentiometer are respectively analog output ends. Further, the power control module is a relay. Further, the number of the power control modules is multiple, the plurality of I/O ports of the main control chip are respectively connected with the control ends of the power control modules, the plurality of the power control modules are connected with the external stabilized voltage power supply, the number of the cursor ends of the digital potentiometer is matched with that of the power control modules, and the cursor ends of the digital potentiometer are respectively connected with the corresponding power control modules. Further, the number of the digital potentiometers and the number of the fixed value resistors are multiple, the number of the digital potentiometers is matched with the number of the fixed value resistors, and the digital potentiometers are respectively connected with the corresponding fixed value resistors. A calibration method of a thermal resistance simulation device comprises the following steps: s1, a power supply control module is connected with an external stabilized voltage power supply, a thermal resistance simulation device is connected with a power supply, and a main control chip outputs an opening control signal to the power supply control module so that the power supply control module is communicated; S2, controlling the digital potentiometer to be adjusted to a minimum resistance value through a main control chip, and sampling through the main control chip; S3, controlling the digital potentiometer to adjust to a full-scale resistance value through the main control chip, and sampling through the main control chip; s4, calculating to obtain the unit change resistance of the digital potentiometer according to the full-scale resistance, the internal resistance and the maximum order of the digital potentiometer; s5, outputting a turn-off control signal to the power control module through the main control chip to disconnect the power control module; S6, according to the unit change resistance value and the internal resistance value of the digital potentiometer, t