--- In LTspice@..., "jpopelish" <jpopelish@r...> wrote:
--- In LTspice@..., "Helmut Sennewald"
<helmutsennewald@y...> wrote:
Hello John,
I have already made a new folder with two sub-folders for
the PTC
models.
Files > Lib > PTC Thermistors > Behaviorial Model
I recommend that you upload all your files into the folder above.
If you think you have a better name for your folder then feel
free to create one below the folder
"Files > Lib > PTC Thermistors".
Best regards,
Helmut
PS: I am working on a model from Timo Veijola.
"Large-Signal Simulation Model for PTC Thermistor"
Extracting the paramters for new devices looks difficult, but
it's one of the very few sources about PTC resistors.
I hope that I can upload this model tomorrow.
This PTC-model is also used in TINA-Spice. They have some models
of PTCs(Philips?) in their demo version.
Thank you for the additional information.
I put both the model and component in the directory you created and
added a sub directory to cover the Mathcad derivation I used, in
case someone wants to reconstruct the method.
Let me know if this is appropriate. Once I have found home for
this info, I guess I will delete the files from the temp directory.
Hello John,
thanks for moving your files into this "Lib"-directory.
If your files in the "Temp"-folder are the same , then please
delete it from the Temp-folder.
I have finished today a model based on a work from Timo Veijola.
"Large-Signal Simulation Model for PTC Thermistor"
Extracting the paramters for new devices looks difficult, but
it's one of the very few sources about PTC resistors.
Files > Lib > PTC Thermistors > Physical model
What's about the idea of a more simple PTC-model just made of
a NTC resistor and a PTC resistor in series and one high value
ohmic resistor in parallel to both? It would only require 5
parameters, maybe with an optional parameter for some voltage
dependency.
Best regards,
Helmut
PS:
This PTC-model is also used in TINA-Spice.
They have some models of PTCs(Philips) in their demo version.
The parameters are fully compatible to the mentioned article
from Timo Veijola.
Another resource about PTCs is in the document
"General Technical Information" on the webpages from www.epcos.com
earResistors/PTCThermistors/SwitchingApplications/Page,templateId=ren
der,locale=en.html
