Home  Resistors

Jan 22 2019

What Is Thermistor and How Does It Works?

Main Parameters of the Thermistor

Room temperature resistance value: also known as nominal resistance value, refers to the resistance value at 250C temperature.

Minimum resistance value: The resistivity at zero power of the component is the resistance value at the lowest point of the temperature characteristic curve.

Maximum resistance value: The resistivity at zero power of the component is the resistance value at the highest point of the temperature characteristic curve.

Temperature coefficient: The coefficient of change in resistance caused by temperature change. The larger the temperature coefficient, the more sensitive the thermistor reacts to temperature changes.

Rated voltage: The voltage required for the thermistor to operate stably.

Curie temperature: For a thermistor, the temperature at which the resistance value begins to rise steeply is important. This temperature is called the Curie temperature.


Thermistor Application Circuits

Thermistor Application Circuit (1)

The figure is a temperature compensation circuit using a thermistor. It is a temperature compensation circuit of infrared light-emitting diode VD1. VD1 is used as a photoelectric detector for modulating light. The maximum current is 5OmA and the temperature range is 10-55 °C. RT is a negative temperature coefficient thermistor connected to the base of VT1 to reduce the self-heating effect of the thermistor. RP2 and RP3 are used to adjust the temperature compensation characteristics. VD2 is the receiver, and the received signal is amplified by the TAA761.

Thermistor Application Circuit (1)


Thermistor Application Circuit (2)

Thermistor Application Circuit (2)


Thermistor Application Circuit (3)

Thermistor Application Circuit (3)


You May Also Like:

What Is the Insulation Resistance Meter and How to Test It?

What Is Resistor and Its Function?

Related Articles

  • What Is A Chip Fixed Resistor?
    Warm hints: This article contains about 4000 words and reading time is about 12 mins.IntroductionThe electronic component body of the non-patch component can carry more production information, such as...
  • Thermistor Introduction--​Temperature Se...
    Warm hints: The word in this article is about 4000 and reading time is about 25 minutes.SummaryThermistors are a type of sensitive component, which are divided into positive temperature coefficient th...
  • How to Measure Resistance and How to Det...
    IntroductionThis article mainly introduces some ways about how to measure resistance and how to detect resistance, which can help to reduce errors. Let's take a look at this article.Article CoreMe...
  • What is Resistor and How to Read Resisto...
    Warm hints: The word in this article is about 3250 words and the reading time is about 18 minutes.SummaryThis paper shows the conprehensive introduction of resistor which is one of the common electron...
  • The Analysis of Function and Measurement...
    This video will introduce the function of ground resistance and explain the importance of grounding, environment factors and testingIntroductionOver time, corrosive soils with high humidity and s...
  • What Is the Current Limiting Resistor an...
    Warm hints: This article contains about 5000 words and reading time is about 15 mins.IntroductionIn a circuit, a resistor in series with other components and no signal output at its series connection,...

1 comment

    • Lemi Andrea on 2019-9-26 10:54:38

    Is there any way to judge the quality of the thermistor?

      • author on 2019-9-26 10:57:56
        author

      Re:To detect the quality of the thermistor, the heating method can be the best one. Using the multimeter's resistance file to connect the two leads of the thermistor, and then heat the thermistor (or near the thermistor) with a hot soldering iron (about 20W). If its resistance does not change, indicating that the thermistor is damaged.


Leave a Reply

Your email address will not be published.

 
 
   
Rating: