Heated seat thermistor
Posted: 11 Dec 2020, 16:03
Hi all!
I am in a project, but stuck at the moment. I want to control cheap chinese heated seat pads with the factory wiring and "relay".
In the factory heated pads there is a thermal sensor and the controller senses resistance to ground through that.
On the german forums I was told that this termistor in the circuit is a PTC one that has 2k Ohm resistance at 10C and 15k Ohm at 42C.
My problem is that i am not as familiar with electronic components and I am struggling to find any info how to choose PTC thermistors.
I have found charts and calculators for NTCs but not for PTCs.
I have drawn a graph that says a linear PTC should have ~7.5Kohm at 25C and a ~433 Ohm/C coefficient, but on data sheets of PTC thermistors I have not found any coefficient like this.
Could anybody guide me to the right direction?
Thanks!
I am in a project, but stuck at the moment. I want to control cheap chinese heated seat pads with the factory wiring and "relay".
In the factory heated pads there is a thermal sensor and the controller senses resistance to ground through that.
On the german forums I was told that this termistor in the circuit is a PTC one that has 2k Ohm resistance at 10C and 15k Ohm at 42C.
My problem is that i am not as familiar with electronic components and I am struggling to find any info how to choose PTC thermistors.
I have found charts and calculators for NTCs but not for PTCs.
I have drawn a graph that says a linear PTC should have ~7.5Kohm at 25C and a ~433 Ohm/C coefficient, but on data sheets of PTC thermistors I have not found any coefficient like this.
Could anybody guide me to the right direction?
Thanks!