Abstract: The implementation of energy-saving and fast dynamic thermal management (DTM) for electronic devices requires a low-interposition heat flux sensor (LI-HFS) with low thermal resistance and fast response ability. This paper illustrates the detailed operation principle of a new LI-HFS. Aiming at the response characteristics testing requirement of the LI-HFS, a testing system is built on the basis of static heat flow principle, and as a platform for LI-HFS sample test, the testing system is utilized to carry out testing research on steady state characteristics, such as input-output characteristic and temperature difference hysteresis characteristic, as well as dynamic characteristics under heat source step-power. Finally, taking HFS-4 heat flux sensor as reference standard, dynamic contrast test and error analysis on LI-HFS is performed. The results show that the LI-HFS, with good linearity, small hysteresis error and good dynamic measurement performance, is suitable for the interposition measurement of thermal conduction heat flow in DTM system for electronic devices.

Key words: Dynamic thermal management, Heat flux sensor, Response characteristics, Thermal conduction