Conference Output

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All kind of digital resources contributed to a conference, like conference presentations (slides), reports, proceedings, lectures, abstracts, and demonstrations. (URI:

Item types include:

  • conference proceedings
  • conference presentation
  • conference poster not in proceedings
  • conference paper not in proceedings


Recent Submissions

Now showing 1 - 2 of 2
  • Item
    A Programmatic Method For Selecting Transistors For High-Frequency Class-E Amplifiers
    (IEEE, 2023-08-22) O'Connor, Billie; Rouse, Chris; Peterson, Brent
    Radiative wireless power transfer at high efficiency can be achieved with Class-D or Class-E amplifiers. These amplifiers have achievable efficiencies that can be very high but heavily depend on transistor selection. The objective of this work was to partially automate the selection process to quickly generate near-optimal Class-E amplifier designs entirely within MATLAB®. The candidate transistor SPICE models were parsed and converted into a system of first-order ordinary differential equations. A non-stiff numerical solver was used to find steady- state solutions for candidate circuits. A simplex search algorithm was used to find the maximum-efficiency candidate circuit for the transistor. The results were also simulated in LTspice® to confirm accuracy. Eighty-four transistors were compared and seven were found to have high efficiency capabilities at 2.45 GHz. The best performing device achieved 60.6% power-added efficiency in MATLAB®, and the same device achieved 53.0% power-added efficiency in LTSpice®. The incongruency between this work and LTSpice® was small enough to justify its use for eliminating large numbers of candidate transistors.
  • Item
    Lateral Misalignment and Foreign Object Detection in Resonant Capacitive Power Transfer
    (IEEE, 2023-08-22) Herpers, Christian; Rouse, Chris D.
    This paper proposes a method of detecting lateral misalignment and foreign objects in a resonant capacitive power transfer (RCPT) system. Foreign object detection (FOD) under misalignment is also considered. The method considers the admittance matrices associated with a practical RCPT link and leverages voltage measurements on the transmit-side for detection. To support this work, a 13.56MHz RCPT link in- corporating a six-plate structure was designed and built for electric vehicle charging applications. A matching simulation model was created and, when evaluating FOD, metallic and tissue-simulating foreign objects were added. Simulations, val- idated by measurements, show that a lateral misalignment of up to 170mm can be identified, including the direction of misalignment. FOD simulations indicate a detection range of up to 380 mm, also including direction. Further simulations indicate that the detection range surpasses the distance at which the basic restrictions for electromagnetic field exposure would be exceeded. Additionally, simulation results show that foreign objects can be detected under misalignment. Thus, both lateral misalignment detection and FOD can be achieved without the use of external sensors. This work can help to advance the safety features of RCPT at minimal cost for important applications such as electric vehicle charging and electrified roadways.