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Temperature measuring circuit and method

A technology of temperature measurement and capacitance, which is applied in the field of temperature measurement circuits, can solve the problems of large self-heating errors, etc., and achieve the effect of solving measurement errors and reducing self-heating errors

Inactive Publication Date: 2016-06-22
SICHUAN CHANGHONG ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention overcomes the deficiencies of the prior art and provides a temperature measurement circuit and method for solving the technical problem that the thermistor resistance measurement is affected by power supply voltage fluctuations and the self-heating error is large in the traditional technical solution

Method used

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  • Temperature measuring circuit and method

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Embodiment Construction

[0028] The present invention will be further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto.

[0029] like figure 2 Shown, a kind of temperature measuring circuit, it comprises single-chip microcomputer, standard resistance RC, thermistor RT and electric capacity C1; Described standard resistance RC one end is connected with the input and output pin IO1 of described single-chip microcomputer, and the other end is connected with described single-chip microcomputer The trigger input pin CP1 is connected; one end of the thermistor RT is connected with the input and output pin IO2 of the single-chip microcomputer, and the other end is connected with the trigger input pin CP1 of the single-chip microcomputer; one end of the capacitor C1 is connected with the single-chip microcomputer The trigger input pin CP1 is connected and the other end is grounded.

[0030] The present invention charges C1 with 0 vo...

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Abstract

The invention discloses a temperature measuring circuit and method. The temperature measuring circuit is composed of a single-chip microcomputer, a standard resistor RC, a thermistor RT and a capacitor C1. One end of the standard resistor RC is connected with an input-output pin IO1 of the single-chip microcomputer and the other end of the standard resistor RC is connected with a trigger input pin CP1 of the single-chip microcomputer. One end of the thermistor RT is connected with an input-output pin IO2 of the single-chip microcomputer and the other end of the thermistor RT is connected with the trigger input pin CP1 of the single-chip microcomputer. One end of the capacitor C1 is connected with the trigger input pin CP1 of the single-chip microcomputer and the other end is grounded. With the circuit and method, a problem of a measuring error caused by power voltage fluctuation in the traditional measuring method can be solved; and the thermistor carries out charging and discharging only when temperature measurement needs to be carried out, so that a self-heating error caused by long-time current flowing through the thermistor according to the traditional measuring method can be eliminated.

Description

technical field [0001] The invention relates to the technical field of temperature measurement, in particular to a temperature measurement circuit and method. Background technique [0002] Temperature measurement technology is widely used in all aspects of production and life, and it is the basic technology and key technology in refrigeration and heating products. Errors in temperature measurement directly affect product performance and user experience. The thermistor has the characteristics of small size, high sensitivity, high reliability, and low cost. It has been widely used in the temperature measurement of air conditioners and refrigerators. The principle of temperature measurement is that the thermistor shows different resistance values ​​at different temperatures. According to the resistance value of the thermistor, the temperature value can be obtained by calculation or look-up table, so the error of thermistor resistance measurement directly affects the error of te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K7/25
CPCG01K7/25
Inventor 赵静张凯王波
Owner SICHUAN CHANGHONG ELECTRIC CO LTD
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