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   https://doi.org/10.1038/s41467-026-70494-0  

   Ko, Jae-Young; Liu, Wen-Chin B; Mercier, Patrick P (March 2026, Nature Communications)

   Abstract Piezoelectric resonators are becoming attractive alternatives to conventional magnetics in DC-DC converters due to their favorable scaling and manufacturing properties. However, the efficiency and current handling capabilities of baseline piezoelectric resonator-based DC-DC converters degrade at higher voltage conversion ratios due to charge utilization limitations imposed by topological operation. Here we present an Always-Multi-Path Embedded Flying Capacitor Piezoelectric Resonator-based DC-DC converter that uses flying capacitors to add both hybrid multi-path output power delivery features and to reduce the internal charge redistribution losses within the piezoelectric resonator. Specifically, the proposed integrated circuit modifies the optimal voltage conversion of the piezo network from 2:1 to 3:1 while adding a switched-capacitor output network that enables multi-path operation at all times, resulting in a net optimal voltage conversion ratio of 9:1 for the converter, with 4x improved output current. Fabricated in a 180 nm high-voltage CMOS process, the developed chip achieves a peak efficiency of 96.2% at a 48-to-4.8 V conversion ratio. 

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2. Reachability Analysis of Dual Active Bridge DC-DC Converters

   https://doi.org/10.1109/ECCE.2019.8913224  

   Wang, Heqiang; Tang, Zefan; Li, Yan; Zhang, Peng (September 2019, 2019 IEEE Energy Conversion Congress and Exposition (ECCE))
3. Hybrid Adaptive Control for the DC-DC Boost Converter

   Johnson, R.S.; Altin, B.; Sanfelice, R.G. (July 2021, Proceedings of the 7th Analysis and Design of Hybrid Systems)

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4. Energy-based Neural Network Controllers for DC-DC Converters

   https://doi.org/10.1109/COMPEL57166.2025.11121236  

   Tatkare, Kamakshi; Johnson, Brian (June 2025, IEEE)
5. Instantaneous Current and Average Power Flow Characterization of a DC-DC-DC Triple Active Bridge Converter

   https://doi.org/10.1109/PECI61370.2024.10525254  

   Saelens, Jonathan; Morris, Lauryn; Oboreh-Snapps, Oroghene; Fernandes, Arnold; Uddarraju, Praneeth; Strathman, Sophia A; Kimball, Jonathan W (April 2024, IEEE)