Could someone explain to me why the characteristic curve of the PTC looks so strange?
From 100°C it makes sense, depending on the temperature R gets bigger, but why does the resistance get smaller up to 100°C?
Thanks in advance for the explanation!
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Taj, then give the material analysis and construction of your PTC here so that you can check and justify it as a physicist.
Note: there is not DEN a PTC.
The data sheet serves to use this component in such a way that it can offer the desired behavior. This component is more designed as overheating protection or overload protection than for temperature measurement, quasi as thermal protection.
An exact explanation cannot be given here shortly.
Material: Barium titanate crystals with doping of caffeine of higher value. As a result, free electrons are removed which enable a current flow. However, the conductivity at the crystal lattice boundaries is limited by potential thresholds, which are almost “impactly” degraded when a certain temperature falls below (cure temperature) and thus permit a greater current flow because the total resistance becomes smaller.
because such temperature resistances are usually “fixed” to a temperature. for example at 0 degrees the ding has 100 ohms
Depends on the material used and on the basic construction of a PTC. These are also produced with semiconducting materials and thus form barrier layers/depletion zones which are compensated with increasing temperature. This region of the characteristic curve then has a hot conductor behavior.
Not my special area!
If a normal behavior of technical components appears to be, it is therefore necessary to explain construction-related and not exactly with the basic models.
https://de.m.wikipedia.org/wiki/Kaltleiter#Bariumtitanat