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Circuit for testing negative temperature coefficient thermistor

A technology of negative temperature coefficient and thermistor, which is applied in the direction of measuring resistance/reactance/impedance, measuring devices, measuring electrical variables, etc., can solve the problems of flickering readings of digital multimeters, inability to perform corresponding detection, and difficulty of digital multimeters, etc. To achieve the effect of simple and clear circuit design, low manufacturing cost and high integration

Inactive Publication Date: 2003-10-01
HUIZHOU BLUEWAY ELECTRONICS
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

Taking the NTC resistor with a nominal value of 10K at 25°C as an example, when the temperature is 26°C (B=4100), its nominal value is 0.915K, and the reduction value is 0.385K. In other words, when the temperature rises by 0.1°C, its resistance value Reduce 38.5 ohms, this temperature change can also appear in the self-current heat, air flow, and even human breathing during the detection process, so these will cause changes in the resistance value, causing the readings of the digital multimeter to flicker. When the requirement is higher such as ±1%, it is difficult or even impossible to carry out corresponding detection with a digital multimeter, so it is necessary to find another way to use other testing methods

Method used

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  • Circuit for testing negative temperature coefficient thermistor
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Embodiment Construction

[0007] specific implementation plan

[0008] The comparative test method referred to in the present invention is an indirect test scheme, that is, it does not detect the absolute value of the measured object but only detects the relative value between it and the standard value in the parent body, and is a scheme that uses roundabout tactics to solve problems. The design idea is to combine a standard or sample NTC resistance R with the NTC resistance R to be tested X Connected in series in the constant voltage source, since they are all NTC resistors and are in the same position and environment, the external influences received are equal. At the same time, they are connected in series in the circuit. The effect of current heat on them is roughly the same; thus, although factors such as external temperature and current heat have an impact on the resistance of NTC, R / R X It is basically constant and only depends on its own nominal value, so the voltage applied to the NTC and R / R...

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Abstract

A circuit for testing the thermosensitive resistor having negative temp. coefficient is composed of a constant-voltage source, a bridge consisting of standard NTC resistor, R, NTC resistor Rx to be tested and potentiometer RV1, voltage follower V1A connected to the said R, Rx and Rv1 all of which are further grounded, differential amplifier U2 connected to U1A, operating amplifier (U3A and U3B), and dual-limiting voltage detecting circuit. Its advantages are high precision, stability and integrated level, and low cost.

Description

technical field [0001] The invention relates to a circuit for testing the parameters of a thermistor, in particular to a circuit for testing a negative temperature coefficient thermistor. Background technique [0002] In the lithium battery protection board, the negative temperature coefficient thermistor (hereinafter referred to as NTC) as a temperature detection sensor plays a very important role in ensuring the normal and safe use of the lithium battery. Most of the current detection methods for NTC in the protection board are carried out by using a digital multimeter. During the detection, the inspector should look at the thermometer and the data on the multimeter at the same time, and then judge according to the temperature-NTC value comparison table provided by the manufacturer. Whether its parameters meet the requirements. The relationship between NTC and temperature is lnR 2 =lnR 1 [B(1 / T 1 -1 / T 2 )], where B is a constant, R 1 is the temperature T 1 (absolute...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/02
Inventor 骆秋辉冯大明张云成
Owner HUIZHOU BLUEWAY ELECTRONICS
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