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Graduate student Rahul Iyer received his Doctor of Philosophy degree in Electrical Engineering and Computer Sciences on May 24th, 2025. His dissertation was titled “Dynamical Modeling and Control of the Flying Capacitor Multilevel Converter.” Post-graduation, Rahul will begin working at Tesla, Inc. on the Power Electronics Controls for Energy Products team. Congratulations!

Three researchers from the Pilawa Research Group received prestigious awards for outstanding oral and poster presentations at the 40th IEEE Applied Power Electronics Conference (APEC 2025), held in Atlanta, GA. APEC is the premier conference in power electronics, attracting leading experts worldwide.

Syed Tahmid Mahbub, a second-year EE Ph.D student advised by EECS Professor Robert Pilawa-Podgurski, received the Best Oral Presentation Award for his talk titled “Analysis and Implementation of Minimum-Sensor Capacitor Voltage Estimators for Flying Capacitor Multilevel Converters.”

Nagesh Patle, a third-year EE Ph.D student advised by EECS Professor Robert Pilawa-Podgurski, earned the Best Poster Presentation Award for his work on “Achieving Soft-Charging and Over 20% Input Current Ripple Reduction in a 48-to-6 V Dickson Converter Using 3-Phase Split-Phase Control.”

Yicheng Zhu, a postdoctoral scholar and EECS alumnus, advised by EECS Professor Robert Pilawa-Podgurski, was recognized with the Best Oral Presentation Award for his talk titled “Design-Oriented Modeling and Multi-Objective Optimization of Two-Phase Coupled Inductors in Multiphase PWM Converters.”

The APEC Best Presentation Awards recognize outstanding contributions based on several criteria: the quality and design of presentation slides, the clarity and effectiveness of delivery, and the presenter’s ability to engage with and respond to audience questions.

Graduate students Logan Horowitz, S. Tahmid Mahbub, Jiarui Zou, and Professor Robert Pilawa-Podgurski have received a First Best Place Demo Award at the recent 2024 IEEE Energy Conversion Congress & Expo. Their innovative thermal test vehicle design provides a dynamic platform that simulates the heat generation of high-performance GPUs and CPUs, allowing engineers to evaluate cutting-edge cooling technologies with greater precision. By improving the efficiency and effectiveness of data center cooling, the project will contribute to energy savings and sustainability for next-generation, hyper-efficient data centers.

BPEC Director Robert Pilawa-Podgurski was elevated to IEEE fellow in the 2024 class, “For contributions to hybrid switched capacitor power converters”. IEEE Grade of Fellow is conferred by the Board of Directors upon a person with an extraordinary record of accomplishments in any of the IEEE fields of interest. The total number of fellows selected in any one year does not exceed one-tenth of one percent of the total voting Institute membership. Robert received his award at IEEE ECCE in Phoenix this past year. This is a great recognition of the all the hard work by past and present BPEC students!

EECS grad Yicheng Zhu has received a Teaching Effectiveness Award for 2024.

The Graduate Division’s Teaching Effectiveness Award for GSIs honors those who devise solutions to teaching or learning problems they have identified in their classes and write them up in a one-page essay. These essays are published on the GSI Center website for use by instructors.

Zhu’s essay, “Fostering Student Engagement: The Power of Live Class Demonstrations,” emphasizes his approach to enhancing student engagement in large lecture formats. Through the implementation of interactive group activities and targeted feedback mechanisms during the 2023 semester, he successfully created a more inclusive environment that encouraged student participation and fostered a deeper understanding of the material.

Yicheng Zhu is a postdoctoral scholar and Bakar Innovation Fellow advised by Robert Pilawa-Podgurski.

Submitted by nluechin on October 17, 2024

https://eecs.berkeley.edu/news/vivek-bharadwaj-and-yicheng-zhu-receive-teaching-effectiveness-award/

Graduate students Francesca Giardine, Kelly Fernandez (PhD, Fall 2023), along with Dr. Robert Pilawa-Podgurski have won Best Paper Award at IEEE Energy Conversion Conference and Expo – Europe.

They presented A Two-Stage Non-Isolated Hybrid Switched-Capacitor Microinverter Utilizing a Fixed-Ratio Resonant DC-DC Stage with Startup Functionality and Flying Capacitor Multilevel DC-AC Stage. Their work demonstrated a 500W two-stage microinverter solution for residential scale solar that uses exclusively hybrid switched-capacitor converter topologies to convert a 35V DC voltage to a 240V AC voltage. The hardware prototype achieved a competitive power density and efficiency, meeting the growing need for compact solutions for residential-scale renewables.

The paper was presented at ECCE – Europe in Darmstadt, Germany. ECCE brings together academics and industry professionals from around the world to exchange ideas about the energy transition. The best papers were chosen based on the quality of the technical results, paper, and presentation.

Submitted by Sarah Douglas on September 5, 2024

https://bpec.berkeley.edu/pilawa-group-graduate-students-win-best-paper-award-at-ecce-europe/

Rahul K. Iyer, S. Tahmid Mahbub, and Robert C.N. Pilawa-Podgurski have won the Best Student Paper Award at the 2024 IEEE International Communications Energy Conference (INTELEC) for their paper “Quasi- Two-Level Switching for Active Balancing of Flying Capacitor Multilevel Converters Under Light-Load Conditions” (https://ieeexplore.ieee.org/document/10678933/)

Recent work in the Pilawa group has highlighted the design of “active-balancing” controllers to ensure the safe operation of high-performance Flying Capacitor Multilevel (FCML) converters during system transients. This work builds on broader efforts to study the converter dynamics and design stable high-bandwidth controllers. In particular, this work highlights techniques to ensure stable converter operation when the load current is small. Compared to prior work relying on Phase-Shifted Pulse-Width Modulation, the proposed switching scheme enables active balancing at average load currents approaching and equal to zero. The conference paper and oral presentation given at IEEE INTELEC 2024 highlight the proposed switching and control methods and showcase the practical implementation of the controller on industry-standard digital signal processor hardware.

They are continuing to work on additional characterization of the balancing controller at different operating conditions, and aim to apply the proposed technique to demonstrate safe startup of the converter at light-load conditions.

Submitted by Sarah Douglas on October 20, 2024

https://bpec.berkeley.edu/rahul-iyer-and-tahmid-mahbub-win-best-paper-award-at-ieee-intelec-2024/

We are pleased to introduce the newest members of our PhD cohort at the Pilawa Group: Emmi Wyttenbach, Dennis Woo, and Shuyu Zhang.

Emmi Wyttenbach joins us from Cornell University, where she earned her Bachelor’s degree in 2024. During her time at Cornell, she conducted power electronics research under Prof. Khurram Afridi, focusing on the development of active energy buffer solutions. Outside of her academic pursuits, Emmi is an avid soccer player and enjoys running and swimming.

Shuyu Zhang completed her Bachelor’s degree at Huazhong University of Science and Technology (HUST) in China in 2023, followed by Master’s studies at Stanford University before joining Berkeley. With a passion for Anime, comics, and games (ACG), Shuyu has been an active cosplayer at anime conventions since 2016. She also has a keen interest in photography.

Dennis Woo graduated from Stanford with a Bachelor’s degree in 2023 and a Master’s degree in 2024. His research background includes high-frequency power electronics and wide-bandgap semiconductor materials. Outside of work, Dennis enjoys exploring the outdoors,
and he spends his time with photography, soccer, volleyball, and climbing.

We look forward to supporting their growth and contributions to the group and are excited for the perspectives they bring!

EECS graduate students Logan Horowitz, Syed Tahmid Mahbub, Jiarui Zou, and Professor Robert Pilawa-Podgurski have received a Best Showcase Award at the 2024 ARPA-E Energy Innovation Summit. In collaboration with a team from the University of Illinois Urbana-Champaign and other academic and industry partners, the Berkeley team developed technology that aims to drastically improve the efficiency of future data centers. Their work focused on the design of a thermal test vehicle (TTV) for assessing cooling solutions.

The ARPA-E Energy Innovation Summit convenes experts from different technical disciplines and professional communities to address America’s energy challenges. The Summit offers a unique, three-day program, highlighting cutting-edge ideas with the most potential for meaningful impact.

Submitted by Gloria Tao on June 14, 2024

https://eecs.berkeley.edu/news/berkeley-eecs-researchers-win-best-showcase-award-at-the-arpa-e-energy-innovation-summit/

Having spent the past four years with UC Berkeley, Dr. Ellis is moving to the University of California Santa Cruz — Baskin School of Engineering. Here his research group will be hosted at UCSC’s Westside Research Park, a stone’s throw from Natural Bridges State Beach.

During his time at UC Berkeley, Dr. Ellis collaborated extensively with BPEC researchers, contributing to the development of high-density power electronics and renewable energy systems. His teaching contributions have also earned him UC Berkeley’s recognition for “teaching effectiveness that greatly exceeds the departmental average”.

The Pilawa-Group would like to wish him the best of luck in his continuing academic career!

Prof. Robert Pilawa-Podgurski has received the 2024 Spark Award from Bakar Fellows Program, with Dr. Yicheng Zhu as his Innovation Fellow. Their awarded research proposal, titled “Powering the AI Revolution: A New Voltage Regulator Enabling Direct 48-V-to-1-V Vertical Power Delivery for Next-Generation Ultra-High-Power Processors,” aims to make use of innovative tools and techniques designed in Prof. Pilawa’s lab to develop a hybrid switched-capacitor voltage regulation module for ultra-high-power processors that can achieve a 2x reduction in power conversion losses and a 4x reduction in physical size compared to state-of-the-art commercial products. This could reduce overall data center power usage by almost ten percent, benefiting both the environment and businesses.

The Bakar Fellows Program has been committed to expanding access to entrepreneurship since its inception in 2012, providing funding, resources, and mentorship to faculty, graduate students, and, most recently, undergraduates. This year marks the beginning of a new partnership with the Academic Innovation Catalyst (AIC), a new deep tech funding platform founded by Matt and Lisa Sonsini. Initially, AIC will join forces with the Bakar Fellows program to allocate grants to Berkeley faculty immersed in deep technology exploration, particularly in climate technology. Grant recipients will receive $300,000 over three years for market research, prototype development and other commercialization activities, in line with the standard Bakar Fellows award amount and duration. AIC envisions expanding this pilot initiative across UC Berkeley and beyond, fostering innovation on a broader scale within the academic community. The inaugural recipients of the AIC grants are Robert Pilawa-Podgurski, a UC Berkeley Electrical Engineering & Computer Sciences professor, and Zakaria Al Balushi, a UC Berkeley Materials Science and Engineering assistant professor.

Graduate student Yicheng Zhu received his Doctor of Philosophy degree in Electrical Engineering and Computer Sciences on May 18th, 2024. His dissertation was titled “High-Performance Hybrid Switched-Capacitor Power Converters: Circuit Topologies, Control Techniques, and Analytical Models.” Congratulations!

Graduate student Rose Abramson received her Doctor of Philosophy (Ph.D.) in Electrical Engineering and Computer Sciences on May 18th, 2024. Her dissertation was titled “Split-Phase and Multi-Resonant Operation of Hybrid Switched-Capacitor Converters.”

Graduate student Sahana Krishnan received her Master of Science degree on May 14th, 2024. Her master’s thesis is titled “An EMI-Compliant and Automotive-Rated 48 V to Point-of-Load Dickson-Based Hybrid Switched-Capacitor DC-DC Converter.” Congratulations!

EECS grad Yicheng Zhu has received a Ross N. Tucker Memorial Award for 2024.

The Tucker Award is given to recognize superior work and scholarship in the characterization, development and/or use of semiconductor, magnetic, optical or electronic materials by a graduate student or students pursuing such areas of inquiry. This award memorializes Dr. Ross N. Tucker, who contributed significantly to the advancement of the technology of materials used in semiconductor electronics. More details about this award can be found on the EECS Department website. Yicheng’s thank you video can be viewed here. (edited) 

EE researcher Ben Liao, working with Professor Robert Pilawa-Podgurski, has received the Best Presentation Award at the 2024 IEEE Power and Energy Conference at Illinois (PECI) – a student-directed power and energy conference held annually at the University of Illinois at Urbana-Champaign. The PECI Best Presentation Award is determined both by conference directors and input from attendees.

Ben received the Best Presentation Award for his work on designing and building a high-power, electronically-controlled, modular resistive load bank. The proposed design overcomes testing limitations in commercial solutions when characterizing state-of-the-art converters. The architecture can easily be extended and modified to suit various other applications where an electronically-controlled resistive load is desired. For more information, please consult the full paper, available at this link.

EE grad student Logan Horowitz and post-doc Nathan Miles Ellis, advised by Professor Robert Pilawa-Podgurski, have received awards for outstanding technical presentations at the IEEE Applied Power Electronics Conference (APEC)–the flagship conference in power electronics. 

Logan received a Best Presentation award for his work on a 14-level  Flying-Capacitor-Multilevel inverter for electric vehicles, and Nathan for his work on a 48V-to-1V point-of-load (PoL) converter for aerospace telecommunications and computing applications. Both works demonstrated performance greatly exceeding state-of-the-art capabilities in energy conversion.

The APEC Best Presentation Awards are scored using several criteria, including quality of slides, presentation, and how well the presenter responds to questions. The award is considered a significant professional achievement. APEC 2024 hit record attendance this year, which took place in Long Beach, CA.

Submitted by Gloria Tao on March 25, 2024
https://eecs.berkeley.edu/news/berkeley-eecs-wins-best-presentation-awards-at-ieee-apec/



Graduate students Kelly Fernandez and Maggie Blackwell successfully delivered their dissertation talks and graduated this December. Kelly’s talk was titled “High-Performance Grid-Tied Single-Phase Power Converter Design with Applications in Electric Vehicle Charging and Residential Photovoltaic Systems”, and Maggie’s talk was titled “Switching Strategies for Hybrid Switched-Capacitor DC-DC Power Converters.” Congratulations to our BPEC graduates!

EECS graduate students Yicheng Zhu and Jiarui Zou, and post-docs Ting Ge and Nathan Ellis have won the 2023 IEEE Control and Modeling for Power Electronics (COMPEL) Best Paper Award. Their paper, “A 48-V-to-1-V Switching Bus Converter for Ultra-High-Current Applications,” demonstrated a new dc-dc power converter topology and control technique for data center power delivery applications, capable of sourcing 1200 A of current at 1 V supply voltage. The hardware prototype used to validate the concept achieved the highest power density and efficiency combination of any prior work, academic or industrial. Next, the researchers are working with industry partners to transition this record-breaking concept to next-generation GPU/CPU computing platforms for AI and machine learning applications. IEEE COMPEL is the premier control and modeling conference for power electronics, having brought together world experts in the field for the last 24 years. Three best papers were selected this year from the total accepted 84 papers, based on originality, contribution to the field, and quality of presentation at the conference. 

Submitted by Matthew Santillan on September 26, 2023 – 11:34am

https://eecs.berkeley.edu/news/2023/09/eecs-grads-win-another-ieee-compel-best-paper-award

We are delighted to introduce Tahmid Mahbub, who joins our research group at Cal after six years of invaluable industry experience at Apple. Tahmid’s journey from his undergraduate studies at Cornell University, where he was recognized as the Best Undergraduate Teaching Assistant, to his tenure at one of the world’s leading tech companies, underscores his passion for excellence and innovation.

Originating from Dhaka, Bangladesh, Tahmid’s early adventures in electronics, documented on his blog, reflect his innate curiosity and drive for exploration. Despite his demanding schedule, Tahmid finds joy in sports, particularly soccer (number 9), cricket, and tennis, as well as friendly competitions in games like Catan and FIFA.

Tahmid’s palate is as diverse as his interests, as he seeks out the best burrito spots in Berkeley and indulges in his love for Kacchi biryani. His affinity for the unconventional extends to his favorite getaway, Death Valley National Park, embodying his adventurous spirit and appreciation for the extraordinary.

As Tahmid embarks on this new chapter with us, we extend our warmest welcome and look forward to the exciting collaborations and discoveries that lie ahead. Please join us in welcoming Tahmid to our research family at Cal!