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Real-Time Temperature Estimation for Power MOSFETs Considering Thermal Aging Effects

journal contribution
posted on 04.04.2016, 09:10 by H. Chen, Bing Ji, V. Pickert, W. Cao
This paper presents a novel real-time power-device temperature estimation method that monitors the power MOSFET's junction temperature shift arising from thermal aging effects and incorporates the updated electrothermal models of power modules into digital controllers. Currently, the real-time estimator is emerging as an important tool for active control of device junction temperature as well as online health monitoring for power electronic systems, but its thermal model fails to address the device's ongoing degradation. Because of a mismatch of coefficients of thermal expansion between layers of power devices, repetitive thermal cycling will cause cracks, voids, and even delamination within the device components, particularly in the solder and thermal grease layers. Consequently, the thermal resistance of power devices will increase, making it possible to use thermal resistance (and junction temperature) as key indicators for condition monitoring and control purposes. In this paper, the predicted device temperature via threshold voltage measurements is compared with the real-time estimated ones, and the difference is attributed to the aging of the device. The thermal models in digital controllers are frequently updated to correct the shift caused by thermal aging effects. Experimental results on three power MOSFETs confirm that the proposed methodologies are effective to incorporate the thermal aging effects in the power-device temperature estimator with good accuracy. The developed adaptive technologies can be applied to other power devices such as IGBTs and SiC MOSFETs, and have significant economic implications.

History

Citation

Device and Materials Reliability, IEEE Transactions on, 2014, 14(1), pp. 220-228

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Engineering

Version

AM (Accepted Manuscript)

Published in

Device and Materials Reliability

Publisher

Institute of Electrical and Electronics Engineers (IEEE), United States

issn

1530-4388

Acceptance date

15/11/2013

Copyright date

2013

Available date

04/04/2016

Publisher version

http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6674100&filter=AND(p_IS_Number:6755472)&pageNumber=2

Language

en