Datasheet > N_03I00471

N_03I00471

更新时间： 2022-03-22 06:43:28

品牌	Logo	应用领域
京瓷/艾维克斯 - KYOCERA AVX		/
页数	文件大小	规格书
38页	823K
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NTC Thermistors

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NTC Thermistors

Application Notes

TEMPERATURE MEASUREMENT

High sensitivity and low cost make NTC thermistors the most

common device used for temperature measurement.

Thermistor

circuit

Non-linearity of the R -T curve generally leads to the use of

a resistor network to linearize the signal. An example is

given in Figure 6.

A/D

converter

More precise measurements and temperature display can

also be achieved with simple electronic equipment as

shown in Figure 7.

μ processor

with R/T

algorithm

The choice of the model will particularly take into account

the small size (better response time) and the resistance

tolerance. Mounting conditions (dissipation), and input volt-

age (self-heating) will also be carefully defined to avoid serious

errors in temperature measurement.

R_NTC

Display T°C

Figure 6

Figure 7

TEMPERATURE CONTROL

AND ALARM

NTC thermistors can be used as a simple on-off control tem-

perature system or temperature alarm system. Figure 8 gives

an example of such a circuit.

When the temperature increases to a defined value, the

resistance of the thermistor decreases and the current

becomes sufficiently high to energize the relay and provide

temperature alarm or heating system turn-off.

R_NTC

The high sensitivity of thermistors (about 4% resistance

change for 1°C) allows the temperature to be controlled very

precisely.

Figure 8

TEMPERATURE COMPENSATION

As many electronic components (integrated circuits, ampli-

fiers,...) have a positive temperature coefficient of resistance,

NTC thermistors represent a cheap and interesting solution

to compensate for this effect and provide an improved

temperature stability for electronic equipment.

Resistance

It is necessary to include the thermistor in a resistor network

(Figure 10) calculated in such a manner that the network

coefficient compensates exactly for the positive temperature

coefficient of the other component (Figure 9).

Total

Common leaded discs or chip thermistors are well suited for

this application.

NTC

Temperature

Figure 9

Figure 10

1...4 5 678 9 10...38

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