Title :
A galvanic isolated evaluation of a NTC thermistor using a logarithmic amplifier
Author :
Polonskiy, Yevgen ; Surmann, Denis ; Laudensack, Christian ; Gerling, Dieter
Author_Institution :
Dept. of Electr. Drives & Actuators, Univ. der Bundeswehr, Munich, Germany
Abstract :
This paper presents a possibility to evaluate a NTC (negative temperature coefficient) thermistor, which exhibits an exponential behavior, using a logarithmic circuit. The presented method allows a quicker and precise processing compared to look-up tables or linearizing circuits. The resistance value is converted into a galvanic isolated voltage signal. Furthermore the presented design is optimized for a low current consumption. Both features allow a direct application on the power stage side with a supply given by IGBT driver auxiliary supply.
Keywords :
amplifiers; driver circuits; insulated gate bipolar transistors; thermistors; IGBT driver auxiliary supply; NTC thermistor; current consumption; exponential behavior; galvanic isolated evaluation; galvanic isolated voltage signal; logarithmic amplifier; logarithmic circuit; negative temperature coefficient; precise processing; quicker processing; resistance value; Insulated gate bipolar transistors; Light emitting diodes; Resistance; Resistors; Temperature measurement; Thermistors; Isolated circuit; NTC thermistor; logarithmic amplifier; operational amplifier; temperature monitoring;
Conference_Titel :
Power Electronics and Motion Control Conference and Exposition (PEMC), 2014 16th International
Conference_Location :
Antalya
DOI :
10.1109/EPEPEMC.2014.6980630
