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Measuring structure functions of power devices in inverters

Aliyu, Attahir Murtala; Castellazzi, Alberto


Attahir Murtala Aliyu

Alberto Castellazzi


This paper proposes the measuring of structure function from power devices on-board induction motor drives and multilevel converters. It puts forward the issues and methodology related to on-board measurement of the cooling curve and derivation of the structure function during idle times in induction motor drives for maintenance purposes. The structure function uses the thermal resistances and capacitances in the Cauer form to identify changes in the device structure. The advantage of the structure function is that it does not only reveal the value but also the location of the thermal resistance and capacitance in the heat flow path. The novelty in this work is the methodology used to achieve the measurement of the cooling curve and obtaining the structure function despite issues related to freewheeling current due to energy stored as a result of motor inductance. A detailed description of the measurement circuit is presented. The possibility of applying this technique to multilevel converters in different application is also elaborated.


Aliyu, A. M., & Castellazzi, A. (in press). Measuring structure functions of power devices in inverters. Microelectronics Reliability,

Journal Article Type Article
Acceptance Date Mar 28, 2017
Online Publication Date Apr 12, 2017
Deposit Date May 25, 2017
Publicly Available Date May 25, 2017
Journal Microelectronics Reliability
Print ISSN 0026-2714
Electronic ISSN 0026-2714
Publisher Elsevier
Peer Reviewed Peer Reviewed
Public URL
Publisher URL


Micro Electronics Therminic Aliyu.pdf (1.7 Mb)

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