Lämpötiladiodi

Lämpötiladiodi, known in English as a temperature diode, is a semiconductor device that exhibits a predictable change in its electrical characteristics with temperature. While not a standard diode in the typical sense of rectifying alternating current, its junction voltage is sensitive to temperature variations. This sensitivity allows it to be used as a temperature sensor.

The core principle behind a lämpötiladiodi's operation lies in the intrinsic semiconductor material properties. As temperature increases, the number of charge carriers in the semiconductor material increases, leading to a change in the diode's forward voltage drop. This voltage drop typically decreases linearly with increasing temperature. The relationship between the diode's forward voltage (Vf) and temperature (T) can be approximated by the equation Vf = a - bT, where 'a' and 'b' are constants that depend on the specific diode and the operating current.

Lämpötiladiodeja are often incorporated into electronic circuits to measure or monitor temperature. They are relatively simple, inexpensive, and can provide a reasonable degree of accuracy for many applications. Their small size and low power consumption also make them suitable for a wide range of uses. Common applications include temperature compensation in electronic circuits, simple thermometers, and as part of more complex temperature measurement systems. The output from a lämpötiladiodi is typically a voltage that varies with temperature, which can then be processed by other electronic components to display a temperature reading or trigger an action.