A Synchronous Boot-strapping Technique with Increased On-time and Improved Efficiency for High-side Gate-drive Power Delivery
ID：76 Submission ID：136 View Protection：ATTENDEE Updated Time：2021-08-16 06:56:20 Hits：590 Oral Presentation

Start Time：2021-08-27 11:00 （Asia/Shanghai）

Duration：15min

Session：[Room2] Oral Session 2 » [S5&S6] WBG Device Design and Gate Drivers

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Abstract
In this work we demonstrate a synchronous boot-strap power delivery scheme applied to a high level count GaN-based flying capacitor multi-level (FCML) converter. The proposed approach is well suited for high-frequency operation as it eliminates conventional boot-strap diodes and allows for precise on-time control for a maximized conduction duration. Importantly, we note the synchronous boot-strapping scheme’s capability for bi-directional energy transfer: Gate driver power can be injected from either a ground referenced supply, a high-side line referenced supply, or both simultaneously for further reduced voltage droop. A discrete 6-level FCML prototype switching at 500 kHz validates this approach with a measured maximum deviation in supply voltage of 156 mV throughout all 10 series stacked gate drivers for converter duty ratios spanning 15-85%. Subsequently the need for local regulation throughout the gate-drive chain is eliminated, which in turn improves efficiency, simplifies design, and reduces cost.
Keywords
bootstrap method,minimal droop
Speaker
Nathan Miles Ellis
Post-doctoral University of California Berkeley

Nathan Miles Ellis received the B.S. degree in Electrical and Electronic Engineering from the University College Cork, Ireland, in 2013, and the M.S. and Ph.D degrees in Electrical and Computer Engineering from the University of California, Davis in 2017 and 2020 respectively. During this time he was funded in part by both Texas Instruments and the U.S. Dept. Of Education in recognition of research excellence in areas of national need (GAANN). In 2017 UC Davis’ Industrial Affiliates named him Best Graduate Researcher, and at the 2020 International Solid-State Circuits Conference (ISSCC) he received the title of Analog Devices Outstanding Student Designer. His research interests include Mixed Signal Integrated Circuit Design, Energy Harvesting, Renewable Energy Integration, Control, Biomedical Devices, and spans several topics in high performance power converter design, including; Hybridized Switched-Capacitor Power Converters, Multi-Level Converters, Adiabatic Gate-Drives, and a number of related advanced converter techniques. He is currently a Post-Doctoral Researcher at the University of California, Berkeley within the Department of Electrical Engineering and Computer Sciences.

Submission Author
Nathan Miles Ellis University of California Berkeley
Rahul Iyer University of California Berkeley
Robert Pilawa-Podgurski University of California Berkeley
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