Avoiding Divergent Oscillation of Cascode GaN Device under High Current Turn-off Condition

Du, Weijing; Huang, Xiucheng; Lee, Fred C.; Li, Qiang; Zhang, Wenli

doi:10.1109/APEC.2016.7467993

Avoiding Divergent Oscillation of Cascode GaN Device under High Current Turn-off Condition

Conference · Fri Jul 01 00:00:00 EDT 2016

DOI:https://doi.org/10.1109/APEC.2016.7467993· OSTI ID:1644195

Du, Weijing ^[1]; Huang, Xiucheng; Lee, Fred C.; ; Zhang, Wenli

Delta Products Corporation

Cascode structure is widely used for high voltage normally-on GaN devices. However, the capacitance mismatch between the high voltage GaN device and the low voltage normally- off Si MOSFET may induce several undesired features, such as Si MOSFET reaches avalanche during turn-off, and high voltage GaN device loses ZVS turn-on condition internally during soft-switching turn-on process in every switching cycle. This paper presents another issue associated with the capacitance mismatch in the cascode GaN devices. Divergent oscillation could occur at high current turn-off condition, and eventually destroy the device. The intrinsic reason of this phenomenon is analyzed in detail in this paper. A simple solution is proposed by adding an additional capacitor whose position is critical and should be optimized. Experimental results validate the theoretical analysis, and show that the proposed method improves device performance significantly under high current turn-off condition.

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Research Organization:: Delta Products Corporation

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Contributing Organization:: Virginia Polytechnic Institute and State University

DOE Contract Number:: EE0006834

OSTI ID:: 1644195

Country of Publication:: United States

Language:: English

References (14)

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