A Study on Shunt Resistor-based Current Measurements for Fast Switching GaN Devices

Thilini Wickramasinghe (1) , Bruno Allard (1) , Cyril Buttay (1) , Charles Joubert (1) , Christian Martin (1) , Jean-Fraçois Mogniotte (1) , Hervé Morel (1) , Pascal Bevilacqua (1) , Thanh-Long Le (2) , Stephane Azzopardi (2)

1 EE - Ampère, Département Energie Electrique
2 Safran Tech

Current viewing resistor (CVR) based measurement of a high frequency switching cell is presented. The drain current of the low-side GaN HEMT switch was measured at 100 kHz switching frequency for a maximum load current of 8 A and a dc input of 80 V. To analyze the results, both simulations and experiments were used. The parasitic elements of the PCB layout (i.e. calculated using the Ansys-Q3D Extractor software) were included in the simulation model. This paper explains the consequences of mounting CVRs in the common-source path of transistors compared to a circuit without a CVR. Simulation results are found to be in very good agreement with measurements. Hence, the simulation model can be used to estimate the current waveforms when it is not desirable to resort to intrusive measurement methods.

Keywords: Index Terms-CVR; GaN HEMT; high frequency; current measurements

Domains: Electric power

Thilini Wickramasinghe, Bruno Allard, Cyril Buttay, Charles Joubert, Christian Martin, et al.. A Study on Shunt Resistor-based Current Measurements for Fast Switching GaN Devices. 45th IEEE IECON, Oct 2019, Lisbonne, Portugal. ⟨10.1109/IECON.2019.8927490⟩. ⟨hal-02405883⟩