Contact

  • Academic
    University - Student Department: Electrical Engineering Position: Graduate

All Publications

  • A Spurious-Free Piezoelectric Resonator Based 3.2 kW DC-DC Converter for EV On-Board Chargers IEEE TRANSACTIONS ON POWER ELECTRONICS Stolt, E., Braun, W., Nguyen, K., Chulukhadze, V., Lu, R., Rivas-Davila, J. 2024; 39 (2): 2478-2488

    View details for DOI 10.1109/TPEL.2023.3334211

    View details for Web of Science ID 001132675500077

  • A Stacked Piezoelectric Converter Using a Segmented IDT Lithium Niobate Resonator IEEE OPEN JOURNAL OF POWER ELECTRONICS Braun, W. D., Stolt, E. A., Nguyen, K., Segovia-Fernandez, J., Chakraborty, S., Lu, R., Rivas-Davila, J. M. 2024; 5: 286-294

    View details for DOI 10.1109/OJPEL.2024.3365029

    View details for Web of Science ID 001179543000001

  • Near Spurious-Free Thickness Shear Mode Lithium Niobate Resonator for Piezoelectric Power Conversion. IEEE transactions on ultrasonics, ferroelectrics, and frequency control Nguyen, K., Chulukhadze, V., Stolt, E., Braun, W., Segovia-Fernandez, J., Chakraborty, S., Rivas, J., Lu, R. 2023; PP

    Abstract

    Piezoelectric power converters, where acoustic resonators replace the inductors as energy storage elements, promise much higher power density and higher efficiency compared to conventional circuits. Recently, lithium niobate (LiNbO3) piezoelectric resonators have been integrated within power converter circuits, showing good conversion efficiency, thanks to their high quality factor (Q) and electromechanical coupling (kt2). However, the converter output power range is limited by large spurious modes near resonance. This work reports a near-spurious-free LiNbO3 thickness shear (TS) resonator, demonstrating high Q of 3500 and kt2 of 45% at 5.94 MHz, with a fractional suppressed region of 35%. First, we identify the best LiNbO3 crystal orientation for efficient TS resonators. Then, we propose a novel acoustic design without busbars for spurious suppression, which is extensively simulated, fabricated, and characterized. Further analysis is done to identify existing spurious modes in our proposed design, specifically the effect of dicing on our TS resonator design. Upon optimization, LiNbO3 TS resonators could potentially empower a new design space for low-loss and compact power converters.

    View details for DOI 10.1109/TUFFC.2023.3303123

    View details for PubMedID 37549088

  • Forward-Zero Cycle Closed-Loop Control of Piezoelectric Resonator DC-DC Converters Stolt, E. A., Braun, W. D., Rivas-Davila, J. M., IEEE IEEE. 2022

    View details for DOI 10.1109/COMPEL53829.2022.9829965

    View details for Web of Science ID 000860291900018

  • Near-Spurious-Free Lithium Niobate Resonator for Piezoelectric Power Conversion with Q of 3500 and k(t)(2) of 45% Nguyen, K., Stolt, E., Braun, W., Segovia-Fernandez, J., Chakraborty, S., Rivas, J., Lu, R., IEEE IEEE. 2022

    View details for DOI 10.1109/IUS54386.2022.9958319

    View details for Web of Science ID 000896080400378

  • Reverse Recovery Testing of Small-Signal Schottky Diodes Braun, W. D., Stolt, E. A., Gu, L., Rivas-Davila, J. M., IEEE IEEE. 2021: 5611-5615

    View details for DOI 10.1109/ECCE47101.2021.9595177

    View details for Web of Science ID 000805434405125

  • Class E Power Amplifier with Piezoelectric Resonator Output Branch Daniel, C., Stolt, E., Rivas-Davila, J., IEEE IEEE. 2021

    View details for DOI 10.1109/COMPEL52922.2021.9645966

    View details for Web of Science ID 000803067800028

  • Piezoelectric Resonator Second Harmonic Cancellation in Class Phi(2) Inverters Stolt, E. A., Braun, W. D., Daniel, C. Y., Rivas-Davila, J. M., IEEE IEEE. 2021

    View details for DOI 10.1109/COMPEL52922.2021.9646078

    View details for Web of Science ID 000803067800107

  • Fixed-Frequency Control of Piezoelectric Resonator DC-DC Converters for Spurious Mode Avoidance IEEE OPEN JOURNAL OF POWER ELECTRONICS Stolt, E., Braun, W. D., Gu, L., Segovia-Fernandez, J., Chakraborty, S., Lu, R., Rivas-Davila, J. 2021; 2: 582-590

    View details for DOI 10.1109/OJPEL.2021.3128509

    View details for Web of Science ID 000725789000001