Thermal Coupling of NTC Chip Thermistors

• Main Authors: Bodic, Milan Z., Aleksic, Stanko O., Rajs, Vladimir M., Damnjanovic, Mirjana S., Kisic, Milica G.
• Format: Conference Proceeding
• Language: English
• Subjects: Chip thermistors; Cogeneration; Couplings; Current measurement; heat transfer; Resistance; Semiconductor device measurement; Temperature measurement; thermal junction; Thermistors
• ISSN: 2161-2536
• DOI: 10.1109/ISSE61612.2024.10604210

A novel device called thermal coupling of NTC chip thermistors was made by combining two electrically isolated chip thermistors Th 1 and Th 2 having small dimensions (0603) and small power (1/10 W). The first thermistor Th 1 (input thermistor) is self-heating at a constant supply voltage U - it generates heat while the second thermistor Th 2 is passive (output thermistor) - it receives heat. Thermistors are electrically insulated, but thermally coupled. The temperature dependence of NTC chip thermistors R(T) was measured and exponential factor of thermistor resistance B was determined. After that, current I 1 of self-heating thermistor as a function of supply voltage U and using resistance R 1 of input thermistor was determined. The electrical resistance of output thermistor R 2 was measured by multimeter at the same time as the current of input thermistor. Using the Steinhart - Hart equation the temperature T 1 and T 2 of both thermistors were determined. The application of novel thermistor junction is expected in power microelectronics for electrical decoupling/thermal coupling of input to output slowly changeable signals.