Resistor, temperature-dependent (PTC)

In a temperature-dependent resistor of type PTC (Positive Temperature Coefficient), the resistance value rises as the temperature rises.

Temperature-depended resistors can be heated by external or internal heating. In case of external heating, the component is heated by ambient temperature and by the current running through the component.

The local ambient temperature T_e can be changed during simulation and is displayed as a colored scale with a pointer. The arising component temperature T is not shown symbolically. But it can be shown in a diagram or the circuit.

Especially PTC resistors build from metal behave like NTC resistors up to a certain temperature. This is taken into account by FluidSIM and can be specified by providing three reference points.

1. Reference resistance R_0 at low temperature T_0. 2. Temperature T_C at minimal resistance R_C. 3. Reference resistance R_1 at high temperature T_1".

This means the resistance falls to T_C and rises afterwards.