Contact Us
RESEARCH

CPES Patent Information

US Patent: 9735238

Avoiding Internal Switching Loss in Soft Switching Cascode Structure Device
Xiucheng Huang, Weijing Du, Qiang Li, Fred C. Lee
Issued: August 15, 2017


Abstract:
In a cascode switching device, avalanche breakdown of a control transistor and loss of soft switching or zero voltage switching in a high voltage normally-on depletion mode transistor having a negative switching threshold voltage and the corresponding losses are avoided by providing additional capacitance in parallel with a parallel connection of drain-source parasitic capacitance of the control transistor and gate-source parasitic capacitance of the high voltage, normally-on transistor to form a capacitive voltage divider with the drain-source parasitic capacitance of the high voltage, normally-on transistor such that the avalanche breakdown voltage of the control transistor cannot be reached. The increased capacitance also assures that the drain source parasitic capacitance of the high voltage, normally-on transistor is fully discharged before internal turn-on can occur.

Full Patent


INDUSTRY PARTNERS
CPES Intranet | Contact Us Copyright © 2017 Virginia Tech Center for Power Electronics Systems