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Temperature transmitter and method based on program-controlled double constant current power supply

A technology of constant current power supply and constant current source, which is applied to thermometers and thermometers using electric devices and electric/magnetic components that are directly sensitive to heat. It can solve the problem that the circuit output is not 0 and the absolute accuracy cannot reach ±0.1°C And other issues

Active Publication Date: 2019-11-26
CHONGQING TECH & BUSINESS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention aims at the technical problem that the circuit output is not 0 and the absolute accuracy cannot reach ±0.1°C when the measured temperature is 0°C in the existing temperature transmitter, and provides a temperature transmitter based on a program-controlled dual constant current power supply. device

Method used

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  • Temperature transmitter and method based on program-controlled double constant current power supply
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  • Temperature transmitter and method based on program-controlled double constant current power supply

Examples

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Embodiment 1

[0048] figure 1 The reference signs in include: constant current source 10 , thermal resistance 20 , reference resistance 21 , A / D converter 30 , differential amplifier 40 , and microprocessor 50 .

[0049] Basic as attached figure 1 Shown: A temperature transmitter based on a programmable dual constant current power supply, including:

[0050] Thermal resistance 20, the resistance value of described thermal resistance 20 can increase as temperature rises, and concrete thermal resistance 20 is Pt100 thermal resistance 20;

[0051] Reference resistor 21, the reference resistor 21 has the same resistance value as the thermal resistor 20 at 0°C, and the specific reference resistor 21 is a high-precision resistor produced by Zhongshan Xinchiyu Electronic Development Co., Ltd., with a resistance value of 100Ω;

[0052] Two constant current sources 10, the currents generated by the two constant current sources 10 are the same, the currents generated by the two constant current sou...

Embodiment 2

[0061] Compared with Embodiment 1, the only difference is that the A / D converter is provided in the microprocessor. That is to say, what the microprocessor chooses is a high-speed single-chip microcomputer with its own A / D conversion function.

Embodiment 3

[0063] Compared with Embodiment 1, the only difference is that a second multiplexer is also included, and the second multiplexer is used to switch the load status of the two constant current sources, and the load status of the two constant current sources can be given by A bridge formed by a thermal resistor and a reference resistor, or two constant current sources flow through the reference resistor respectively, the second multiplexer is connected to the microprocessor signal, and the A / D converter is also used to read the voltage on the reference resistor And fed back to the microprocessor, the microprocessor adjusts the currents output by the two constant current sources respectively according to the feedback from the A / D converter.

[0064] In specific use: the microprocessor controls one of the two constant current sources to start, and then the microcontroller controls the second multiplexer, so that the load of the started constant current source is the reference resist...

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Abstract

The invention relates to the field of temperature measurement systems, and provides a temperature transmission device based on a program-controlled dual constant current power supply for the technicalproblems of the existing temperature transmission device that the circuit output is not 0 and the absolute accuracy cannot reach + / -0.1 DEG C when the measured temperature is 0 DEG C. The temperaturetransmission device comprises: a thermal resistor, the resistance of the thermal resistor increasing as the temperature rises; a reference resistor, having the same resistance as the thermal resistorat 0 DEG C; two constant current sources, generating the same current, which passes through the thermal resistor and the reference resistor respectively and then is converged and grounded; a differential amplifier, two input ports of the differential amplifier being respectively connected with the current input ends of the thermal resistor and the reference resistor; an A / D converter, connected with the output port of the differential amplifier; and a microprocessor, connected with the A / D converter.

Description

technical field [0001] The invention relates to the field of temperature measurement systems, in particular to a temperature transmitter and method based on program-controlled dual constant-current power supplies. Background technique [0002] In the temperature detection system in the industrial production process, the temperature sensor is usually used with thermal resistance and thermocouple. Since the thermocouple measures the relative temperature, cold junction compensation is required. In the case of continuous measurement or cold junction compensation is not in place , prone to inaccurate measurement results. Thermal resistance does not have the problem of cold junction compensation, so it is widely used in industrial production process. [0003] Existing temperature transmitters usually use thermal resistors as temperature sensing elements. For the convenience of explaining the technical problems, the widely used Pt100 thermal resistance (a thermal resistance, when...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K7/16G01K7/21
CPCG01K7/16G01K7/21
Inventor 杨光祥
Owner CHONGQING TECH & BUSINESS UNIV
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