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A novel gate driver approach using an inductive feed forward for a robust turn-on of GaN power transistors with gate injection

  • Many GaN power transistors contain a PN junction between gate and the channel region close to the source. In order to maintain the on-state, current must continuously be supplied to the junction. Therefore, the commonly recommended approach uses a gate bias voltage of 12V to compensate the Miller current through a boost circuit. For the same purpose, a novel gate driving method based on an inductive feed forward has been presented. With this, stable turn-on can be achieved even for a bias voltage of only 5V. The effectiveness of this concept is demonstrated by double pulse measurements, switching currents up to 27A and a voltage of 400V. For both approaches a compact design with low source inductance is characterized. In addition to the significant reduction of the gate bias voltage and peak gate current, the new approach reduces the switching losses for load currents >23 A.

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Metadaten
Name:Hackel, Jonathan; Pfost, Martin
URL:https://ieeexplore.ieee.org/document/8515622
ISBN:978-90-75815-28-3
Erschienen in:2018 20th European Conference on Power Electronics and Applications (EPE '18 ECCE Europe) : 17-21 Sept. 2018
Publisher:IEEE
Place of publication:Piscataway, NJ
Document Type:Conference Proceeding
Language:English
Year of Publication:2018
Tag:Gallium Nitride; discrete power device; efficiency; high frequency power converter
Pagenumber:6
First Page:1
Last Page:6
Dewey Decimal Classification:620 Ingenieurwissenschaften und Maschinenbau
Access Rights:Nein
Licence (German):License Logo  Lizenzbedingungen IEEE