Dr. Nathan Miles Ellis

Postdoctoral Fellow at the University of California, Berkeley.

With over 40% of society's energy consumed within the electric power sector, power electronics is often either the bottleneck or key enabler for an extremely diverse range of applications. This rapidly expanding area of study is well poised to have direct and positive impacts on efforts in energy sustainability, renewable integration, electric vehicles, hydrogen production, portable and biomedical devices, data centers, and aerospace --- to name only a few.

As a postdoctoral fellow working within the University of California Berkeley's Department of Electrical Engineering and Computer Sciences, I serve as a power electronics specialist, with broader expertise in vehicle electrification and analog & mixed signal integrated circuit design. My core research contributions include the development of advanced hybrid-switched-capacitor (HSC) power converter architectures and associated control and circuit techniques. This work has been funded extensively by the U.S. Dept. of Energy, NASA JPL, NSF, DARPA, and a growing list of industrial partners with whom I work closely to promote rapid adoption of state-of-the-art techniques in clean energy. Working within Berkeley's Power and Energy Center (BPEC) under Director Prof. Pilawa-Podgurski, I co-advise a large number of graduate students whose work is on track to revolutionize modern energy consumption across all sectors.

Biography:

Nathan Miles Ellis was born in Cork, Ireland. He 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). Dr. Ellis is currently with the University of California, Berkeley within the Department of Electrical Engineering and Computer Sciences. His primary area of research is power electronics where he is an author on over 30 journal and conference publications. His interests include vehicle electrification, renewable energy integration, datacenter power delivery, biomedical devices, aerospace, mixed signal integrated circuit design, control and circuit techniques. Dr. Ellis was named Best Graduate Researcher by UC Davis’ Industrial Affiliates in 2017 and he received the title of Analog Devices Outstanding Student Designer at the International Solid-State Circuits Conference (ISSCC) in 2020. Since then he has co-authored two IEEE prize papers and was awarded Best Technical Lecturer on Hybrid DC-DC converters at the Applied Power Electronics Conference (APEC) in 2021.


Select Technical Presentations:

Split-Phase Control for Data-Centers

Modified Split-Phase Switching with Improved Fly Capacitor Utilization in a 48V-to-PoL Dual Inductor Hybrid-Dickson Converter

Presented virtually at ECCE 2021. Full paper here.

Synchronous Boot-Strapping for High-Side Gate Drive Power Delivery

 A Synchronous Boot-Strapping Technique with Increased On-Time and Improved Efficiency for High-side Gate-drive Power Delivery

Presented at the IEEE Workshop on Wide Bandgap Power Devices and Applications in Asia (WiPDA-Asia) 2021. Full paper here.

Dickson vs. Cockcroft-Walton

A Resonant Dual Extended LC-Tank Dickson Converter with 50% Two-Phase Operation at Odd Conversion Ratios [Best Technical Lecture Award]

Presented virtually at APEC 2021. Full paper here.

Closed-Loop Split-Phase Control

Closed-Loop Split-Phase Control Applied to the Symmetric Dual Inductor Hybrid (SDIH) Converter

Presented at the IEEE 24th Workshop on Control and Modeling for Power Electronics (COMPEL), Ann Arbor, Michigan, 2023. Full paper here.

Regenerative Snubbing in Multi-Level Converters

Presented at the Energy Conversion Congress and Exposition (ECCE) 2022. Full paper can be found here.

Achieving ZVS at Light-Load

Reducing COSS Switching Loss in a GaN-based Resonant Cockcroft-Walton Converter Using Resonant Charge Redistribution

Presented at the Energy Conversion Congress and Exposition (ECCE) on October 12th 2020. The full paper can be found here.

Resonant Gate Drivers

A Resonant Gate Driver with Variable Gain and a Capacitively Decoupled High-Side GaN-FET

Presented at the Energy Conversion Congress and Exposition (ECCE) 2020.
The full paper can be found here.