Theory of the thermal switching behaviour of a PTC-resistor device
W. Löser, C. Mattheck · physica status solidi (a) · 1973
The dynamical switching characteristics of a PTC-resistor device with an approximated temperature dependence of the electrical conductivity σ(T) = σ1 below the critical temperature Tc and σ (T) = σ2 ≤ σ1 for temperatures T ≥ Tc are numerically calculated. The influence of the cooling parameters and the electrical conductivity on the temperature distribution and on the switch-on time and the switch-off time is discussed as well as the conditions for the optimal switching behaviour are given. Finally, the problem is described analytically in an approximative way.