How to choose the appropriate resistor to reduce the impact of temperature changes?

The Temperature Coefficient of Resistance (TCR) is a parameter that describes the proportional coefficient of the change in resistance value with temperature. It is usually represented by α and measured in degrees Celsius ⁻¹

The following is the relationship between the temperature coefficient of resistance and temperature:

Definition of Temperature Coefficient of Resistance

The temperature coefficient of resistance is defined as the relative change in resistance value for every 1 degree change in temperature. The formula is expressed as: α=R1 × (T2-T1) R2-R1, where R1 and R2 are the resistance values at temperatures T1 and T2, respectively

Calculation formula for resistance value changing with temperature

The formula for the variation of resistance with temperature is: R (T)=R0 × (1+α × (T − T0)), where R (T) is the resistance value at temperature T, R0 is the resistance value at reference temperature T0, α is the temperature coefficient of resistance, T is the current temperature, and T0 is the reference temperature

The influence of temperature coefficient on resistance value

Positive temperature coefficient: The resistivity of most metal materials increases with temperature, indicating a positive temperature coefficient. For example, the temperature coefficient of copper is about 0.00393/℃

Negative temperature coefficient: The electrical resistivity of certain materials (such as carbon) decreases with increasing temperature, indicating a negative temperature coefficient

Critical temperature coefficient: a material that experiences a sudden change in resistance at a specific temperature, such as superconducting materials, where the resistance suddenly drops to zero at the critical temperature

Reasons for considering temperature coefficient when selecting resistors

Circuit stability: Low temperature coefficient resistors help maintain stable circuit parameters and reduce performance changes caused by temperature fluctuations

Accuracy requirement: In precision measurement and signal processing circuits, selecting resistors with low temperature coefficients can reduce measurement errors or signal distortion caused by temperature drift

Understanding the temperature coefficient of resistance and its relationship with temperature is crucial for electronic circuit design and application, as it affects the stability, accuracy, and reliability of the circuit.


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