The Library
Bootstrap voltage and dead time behavior in GaN DC–DC buck converter With a negative gate voltage
Tools
Roschatt, Philipp Marc, Pickering, Stephen and McMahon, Richard A. (2015) Bootstrap voltage and dead time behavior in GaN DC–DC buck converter With a negative gate voltage. IEEE Transactions on Power Electronics, 31 (10). pp. 7161-7170. 7352351. doi:10.1109/TPEL.2015.2507860 ISSN 0885-8993.
Research output not available from this repository.
Request-a-Copy directly from author or use local Library Get it For Me service.
Official URL: http://dx.doi.org/10.1109/TPEL.2015.2507860
Abstract
The low threshold voltage of Gallium Nitride enhancement mode FETs is a concern in synchronous dc-dc buck converters. This paper presents a converter using a gate drive with a negative biased gate voltage on the low-side FET to improve the dV/dt robustness. The resulting much larger voltage drop during the dead time conduction is a concern as it can quickly overcharge the bootstrap capacitor voltage. This paper demonstrates that with a negative biased gate voltage, the rise in the bootstrap capacitor voltage is predominantly caused by the change in effective dead time conduction due to a variation in output load. A spice model to estimate the change is presented and verified. This paper also found that a change in the bootstrap capacitor voltage must be prevented as it leads to a significant change in turn-on dynamics, resulting in higher dV/dt stress with an increase in output load. To prevent a change in bootstrap capacitor voltage, different techniques such as Zener diode clamping and an external free-wheeling Schottky diode are tested and discussed. Finally, a modification of a standard bootstrap circuit using a series inductor is proposed and tested. It has been found to be the most effective method in preventing a variation in the bootstrap capacitor voltage and should be included when using a negative gate drive in a GaN dc-dc buck converter.
Item Type: | Journal Article | ||||||||
---|---|---|---|---|---|---|---|---|---|
Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||||||
Journal or Publication Title: | IEEE Transactions on Power Electronics | ||||||||
Publisher: | IEEE | ||||||||
ISSN: | 0885-8993 | ||||||||
Official Date: | 10 December 2015 | ||||||||
Dates: |
|
||||||||
Volume: | 31 | ||||||||
Number: | 10 | ||||||||
Page Range: | pp. 7161-7170 | ||||||||
Article Number: | 7352351 | ||||||||
DOI: | 10.1109/TPEL.2015.2507860 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access |
Request changes or add full text files to a record
Repository staff actions (login required)
View Item |