Modeling of the Dynamic On-State Resistance of GaN-HEMTs
Konferenz: PCIM Conference 2025 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
06.05.2025 - 08.05.2025 in Nürnberg, Germany
doi:10.30420/566541208
Tagungsband: PCIM Conference 2025
Seiten: Sprache: EnglischTyp: PDF
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Autoren:
Kohlhepp, Benedikt; Breidenstein, Daniel; Pawellek, Alexander; Dürbaum, Thomas; Dieckerhoff, Sibylle
Inhalt:
Unfortunately, in real switching operation, GaN-HEMTs often do not achieve the promising datasheet values in terms of on-state resistance, as charge trapping effects lead to so-called dynamic on-state resistance. Several dependencies of the on-state resistance, such as the blocking voltage, switched current, switching frequency, duty cycle, and device temperature, as well as type of switching transition (hard or soft switching), make reliable loss predictions difficult. In order to accurately predict conduction losses of GaN-HEMTs in real applications, this paper proposes a modeling approach based on measured data. The study incorporates the blocking voltage, switched current, temperature, switching frequency, and duty cycle. The final model exemplarily derived for hard switching operation is based on the resistance values gained by steady-state operation of the converter and consists simply of linear dependencies on the operating point. It incorporates a positive temperature coefficient and a negative coefficient regarding the switched current.