Thermistor temperature detecting method based on DSP (Digital Signal Processing)

A thermistor and resistance technology, which is used in thermometers, thermometers, measuring devices and other directions that use electrical/magnetic components directly sensitive to heat, can solve the problems of high hardware cost, complex temperature detection and control methods, and low accuracy. To achieve the effect of simple hardware structure, fast operation speed and simple realization

Active Publication Date: 2010-12-22
WISDRI WUHAN AUTOMATION
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Problems solved by technology

At present, the temperature detection and control methods for such control equipment are complicated, the accuracy is not high, and the hardware cost is high

Method used

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  • Thermistor temperature detecting method based on DSP (Digital Signal Processing)
  • Thermistor temperature detecting method based on DSP (Digital Signal Processing)
  • Thermistor temperature detecting method based on DSP (Digital Signal Processing)

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Experimental program
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Embodiment Construction

[0025] figure 1 In order to build a temperature detection system structure diagram based on the DSP platform, the voltage divider circuit of the 3.3V reference power supply is used to realize the voltage conversion of the resistance of the thermistor. The voltage is measured through the AD port of the DSP, and everything else is completed in the DSP. The rest of the temperature calculate. The voltage divider circuit uses a 1% precision 10K resistor in parallel with the thermistor and then connects the same 1% precision 10K resistor in series to output the voltage to the AD port of the DSP. In the DSP, the AD detection voltage is obtained to obtain the AD port input voltage U after voltage division. out .

[0026] The thermistor selected in this embodiment is a negative temperature coefficient thermistor, its model is: NTSA0103FZ485, which can meet the temperature detection requirements of -40°C-105°C.

[0027] The concrete steps of this embodiment are:

[0028] 1) The DSP ...

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Abstract

The invention provides a thermistor temperature detecting method based on DSP, wherein a relational expression between T and lgR-T is obtained by utilizing the temperature of thermistor R-T characteristic detection power equipment and fitting a lgR-T curve in DSP. The method comprises the following steps of: converting the computation for lnR into the approximate operation of addition, subtraction, multiplication and division, obtaining a computing formula by adopting a high-item truncation approximate computing method, then determining a segmenting mode by adopting an error comparison method, and finally obtaining the lnR value of each segment by adopting a segmentation algorithm to realize accurate temperature computation. The temperature detecting precision is greatly improved by adopting the method; the method is simple to realize and has high operational speed; the hardware structure is simple, and the cost is saved.

Description

technical field [0001] The invention relates to a temperature measurement method, in particular to a DSP-based thermistor temperature measurement method. Background technique [0002] Temperature control is often used in other industrial control equipment such as inverters and UPS. The control system determines the control of the radiator fan according to the temperature value. When the temperature exceeds the normal operating range, it will protect the device from overheating to prevent damage to the device caused by continued work. In a general industrial control equipment such as: frequency converter, UPS and other equipment, temperature control is one of the necessary designs for controller design. At present, the temperature detection and control methods for such control equipment are complicated, the precision is not high, and the hardware cost is high. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a DS...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K7/22
Inventor 蔡畅康现伟陶文涛
Owner WISDRI WUHAN AUTOMATION
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