Post on 12-Jan-2022
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Multiphysics Modeling of Fast Dynamic SwitchingTransients
Semester/Master Thesis (HS 2021)
Power PCB
DUT PCB
a) b)
ESL2 ESL1
ESR2 ESR1DDUT
DUT PCBPower PCB Power PCB
CHV2
Vtest= 800V
CHV1
Itest = 20A150nF 12.5µF
166µH
2.5ΩRG
VG
Lload
net HV
net L
net GND
IS
VDS
VGS
Fig. 1: Circuit-electromagnetic coupled modeling of power semiconductor devices: a) an equivalent circuit ofa switching cell, and b) a PCB layout electromagnetic model of the switching cell.
Introduction
The parasitics of power semiconductor packages and power converter layouts increase in importance withthe fast switching properties of wide-band gap (WBG) power semiconductor devices. Three dimensionalelectromagnetic-circuit modeling allows the coupling of device physics and external capacitive and/or induc-tive parasitic effects. ANSYS Electronics Desktop is a state-of-the-art software package frequently used inindustry to evaluate complex switching waveforms of power devices and hence, properly design the externalinterconnections and layouts. The aim of this thesis is to identify the dominant parasitic effects determiningthe device switching performance using the 3D modeling and propose guidelines for designing switching cellPCB layout optimized with respect to HF electromagnetic effects. A student can gain a broad experience inPCB layout design of switching PCB boards and the multiphysics modeling using ANSYS software and circuitsimulators.
Scope of the Thesis
The work can be adjusted towards semester and master thesis project roughly according to the topics:
• Extraction of layout parasitics using ANSYS HFSS and ANSYS Q3D Extractor. Circuit simulationsusing device compact models of SiC power MOSFETs and the extracted electromagnetic layout modelin circuit simulators. (40 %)
• Double pulse-measurements of commercially available SiC power MOSFETs; Proposing guidelines fordesigning PCB layouts optimized with respect to HF electromagnetic effects (30 %)
• TCAD mixed-mode device simulation with the extracted layout parasitics. (20 %)
• Documentation (10 %)
Contact For more details please contact:
Supervisors: Dr. Ivana Kovacevic-Badstuebner kovacevic@aps.ee.ethz.ch ETL F24.2Salvatore Race race@aps.ee.ethz.ch ETL F24.2
Professor: Prof. Dr. U. Grossner ulrike.grossner@ethz.ch ETL F 28