Wolff, Michael Wilhelm (2023)
Evaluation of the Magnetic Field Signature as a Potential Parameter for Power Semiconductor Degradation Detection.
Technische Universität Darmstadt
doi: 10.26083/tuprints-00023115
Ph.D. Thesis, Primary publication, Publisher's Version
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Item Type: | Ph.D. Thesis | ||||
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Type of entry: | Primary publication | ||||
Title: | Evaluation of the Magnetic Field Signature as a Potential Parameter for Power Semiconductor Degradation Detection | ||||
Language: | English | ||||
Referees: | Griepentrog, Prof. Dr. Gerd ; Basler, Prof. Dr. Thomas | ||||
Date: | 2023 | ||||
Place of Publication: | Darmstadt | ||||
Collation: | XVII, 109 Seiten | ||||
Date of oral examination: | 13 December 2022 | ||||
DOI: | 10.26083/tuprints-00023115 | ||||
Abstract: | This work investigates the viability of using the spatial magnetic flux density distribution caused by a semiconductors load current as a parameter to detect degradation of its bond wires and solder joinings. Utilizing a 3D FEM model of a singular IGBT on DCB, simulations of the B-field distribution for samples with intact and partially interrupted solder layer are conducted. The simulation results show that the partial interruption affects the B-field above the bond wires due to a redistribution of the load current. This is confirmed by measurements of the magnetic flux density distribution conducted on samples with identical structure to the model. Utilizing power cycling tests, 40 additional IGBT samples were artificially aged. The observed degradation mechanisms are bond wire lift-off with varying severity as well as strong vertical solder crack propagation emanating from the chips centre area. Measurements conducted for all aged samples show that the observed type of solder crack pattern has no significant influence on the B-field distribution above the semiconductor. Therefore a detectability using the proposed method can be ruled out. Regarding bond wire lift-offs it is shown that, besides the detection, a localisation as well as an identification is possible. Finally, a method for the determination of the bond wire current distribution is investigated. For this, an analytical model of the spatial magnetic flux density distribution, caused by the current flow in multiple bond wire loops, is derived. Utilizing said model in combination with discrete B-Field measurements, an optimisation approach is presented for the identification and localisation of bond wire lift-offs based on deviations in the estimated current distribution. A first viability analysis shows that the approach is capable to identify and localize bond wire lift-offs within the artificially aged samples. |
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Status: | Publisher's Version | ||||
URN: | urn:nbn:de:tuda-tuprints-231152 | ||||
Classification DDC: | 600 Technology, medicine, applied sciences > 620 Engineering and machine engineering | ||||
Divisions: | 18 Department of Electrical Engineering and Information Technology > Institute for Power Electronics and Control of Drives | ||||
Date Deposited: | 01 Feb 2023 13:12 | ||||
Last Modified: | 07 Feb 2023 07:30 | ||||
URI: | https://tuprints.ulb.tu-darmstadt.de/id/eprint/23115 | ||||
PPN: | 504351885 | ||||
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