Jonas Huber


Last Name

Huber

First Name

Jonas

ORCID

0000-0001-6439-2099

Organisational unit

02294 - Mechatronische Systeme / Mechatronic Systems

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2021 - 2026108
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Publications 1 - 10 of 108
  • Next-Generation SiC/GaN Three-Phase Variable-Speed Drive PWM Inverter Concepts
    Item type: Other Conference Item
    Kolar, Johann W.; Huber, Jonas (2021)
  • Energy Efficiency is Not Enough!
    Item type: Journal Article
    Huber, Jonas; Imperiali, Luc; Menzi, David; et al. (2024)
    IEEE Power Electronics Magazine
    In its latest report, the Intergovernmental Panel on Climate Change (IPCC) concludes that any further increase of global temperatures aggravates climate-related risks like species losses, extreme heat and humidity with significant consequences for human health, or negative impacts on food production and water availability; the projected negative outcomes escalate with higher temperature increases [1]. Therefore, worldwide efforts and international policymaking (i.e., The Paris Agreement from 2015) aim at limiting global warming by the end of the 21st century to well below +2°C above pre-industrial levels, preferably to not more than +1.5°C.
  • New 600V GaN Single-Stage Isolated Bidirectional 400V Input Three-Phase PFC Rectifier
    Item type: Conference Paper
    Menzi, David; Kolar, Johann W.; Sarnago, Héctor; et al. (2023)
    2023 IEEE Energy Conversion Congress and Exposition (ECCE)
    This paper introduces a novel single-stage isolated bidirectional partly modular three-phase power-factor-correction (PFC) rectifier topology that requires half the blocking voltage rating of the primary-side transistors compared to conventional monolithic three-phase circuit arrangements. Specifically, interfacing a 400V three-phase grid to a 400V dc output is possible using modern high-performance 600V GaN transistors in standard half-bridge configurations instead of 1200V SiC devices or multilevel bridge-leg structures. The topology is also applicable for solid-state transformers connected to the medium-voltage grid, e.g., a 4.16kV grid can be interfaced using 6.5kV IGBTs. Further, emerging 600V monolithic bidirectional GaN transistors (or, similarly, future bidirectional HV SiC devices) enable further variants of the proposed topology with only half the primary-side power transistor count.
  • Modular Multilevel Converter Circulating Current Control with Single Active Filter Module per Phase
    Item type: Conference Paper
    Huber, Jonas; Kolar, Johann W. (2021)
    2021 22nd IEEE International Conference on Industrial Technology (ICIT)
    Phase-legs of DC/AC modular multilevel converters (MMC, M2LC) transfer power from the DC input to the corresponding phase output terminal by means of a current that circulates through the DC input and the phase-leg. In addition to the load-dependent DC component required for the power transfer, this circulating current contains significant harmonics if no countermeasures are implemented. Prominently, a large second harmonic appears, essentially because each converter arm performs a single-phase power conversion. This results in higher RMS values of the arm currents and ultimately in higher-than-necessary losses. One option to mitigate these undesired harmonics and the associated losses extends each arm of the MMC by an active filter module that controls the circulating current by injecting a common-mode component into the arm voltage. In this paper, we propose a new variant of an MMC topology with such active filter modules. In contrast to the state of the art, the proposed realization shows lower realization effort: it uses only a single active filter module per MMC phase-leg instead of two, which corresponds to a reduced effort in terms of both, power hardware components and also control and communication electronics. Furthermore, a single active filter module can operate fully self-contained if desired, i.e., without an external communication interface, thus simplifying system integration.
  • MVAC-LVDC Hybrid and Solid-State Transformer Concepts for Future Data Centers
    Item type: Other Conference Item
    Huber, Jonas; Wallmeier, Peter; Pieper, Ralf; et al. (2022)
  • Next-Generation Datacenter MV Interfaces — Will Solid-State Transformers Meet Their Waterloo?
    Item type: Other Conference Item
    Kolar, Johann W.; Huber, Jonas (2022)
  • Power Electronics 5.0 – Standing on the Shoulders of Giants
    Item type: Other Conference Item
    Kolar, Johann W.; Huber, Jonas; Zhang, Daifei; et al. (2023)
  • Comparative Evaluation of Ultra-Lightweight Buck-Boost DC-DC Converter Topologies for Future eVTOL Aircraft
    Item type: Conference Paper
    Menzi, David; Yu, Zheyuan; Huber, Jonas; et al. (2022)
    2022 IEEE 23rd Workshop on Control and Modeling for Power Electronics (COMPEL)
    Hybrid battery/fuel cell power supplies for all-electric Vertical Takeoff and Landing (eVTOL) aircraft enable a high peak power capability as well as long-range operation. However, the wide and overlapping voltage ranges of the battery and the fuel cell require an interconnecting bidirectional DC-DC converter with buck-boost capability. For such a converter system, the gravimetric power density is a key metric. Therefore, this paper systematically investigates the weight limits of several converter topology concepts: Starting from a standard two-level four-switch non-inverting buck-boost converter benchmark system, fully soft-switched operation, as well as flying-capacitor multilevel and partial-power-processing variants are compared by means of a comprehensive Pareto optimization (mission-profile efficiency vs. gravimetric power density). Aiming at a mission profile efficiency of (eta) over bar > 98.5%, the results indicate the feasibility of converter realizations with gravimetric power densities of up to gamma > 62kW/kg with a three-level flying capacitor multilevel converter. Further, a virtual prototype of a two-level four-switch non-inverting buck-boost benchmark system is presented with gamma = 46kW/kg, hence illustrating the trade-off between converter performance and complexity.
  • New Phase Current Balancing Control for a Cryogenic Ultra-Low-Loss Bidirectional Multi-Phase Full-Bridge DC-DC Step-Down Converter
    Item type: Conference Paper
    Akbas, Mücahid; Zhang, Daifei; Kolar, Johann W.; et al. (2024)
    2024 IEEE 10th International Power Electronics and Motion Control Conference (IPEMC2024-ECCE Asia)
    This paper proposes a new phase current balancing control method for multi-phase full-bridge step-down dc-dc converters with bipolar output voltage, targeting cryogenic ultra-low- loss power supplies for high-temperature-superconducting (HTS) magnet systems of future particle accelerators. Achieving ultralow losses requires balanced average phase currents but prohibits the use of dedicated phase current sensors or shunts. Therefore, the proposed method reconstructs the phase current imbalance information by indirectly sensing the dc input capacitor current via the dv/dt and processing it in the frequency domain with low computational complexity. Compared to similar existing methods that only target half-bridge dc-dc step-down converters, the proposed method supports full-bridge topologies and high phase counts, as confirmed by detailed circuit simulations with 12 full-bridge phase modules. Finally, the balancing can be improved by phase inductance estimates based on indirectly sensing the output capacitor current, and carrier-to-phase reassignment utilizing the balancing controller information ensures optimum ripple cancellation at the output.
  • Hardware-Based Comparative Analysis of Multilevel Inverter Topologies for Integrated Motor Drives Considering Overload Operation
    Item type: Journal Article
    Rohner, Gwendolin; Gfrörer, Tino; Niklaus, Pascal; et al. (2023)
    IEEE Open Journal of Power Electronics
    With today's demand for increased industrial process automation a trend towards Integrated Motor Drives (IMDs) has evolved allowing a low complexity and compact installation of the drive system. Especially servo applications with high short-term overload requirements (e.g., three times the nominal current for several seconds) are a thermal challenge for the power electronics. Consequently, high efficiencies and power densities are key requirements of these motor-integrated Variable Speed Drives (VSDs). Multi-Level (ML) inverter topologies allow small LC output filter designs and benefit from utilizing low-voltage semiconductors with superior conduction and switching performance, and thus represent an interesting approach for future IMDs. In this work an experimental comparison between three different 800V DC link supplied drive systems is presented, namely between a 3L Flying Capacitor Converter (3L-FCC) (employing 650V GaN HEMTs), a 7L Flying Capacitor Converter (7L-FCC) (using 200V Si MOSFETs) and its promising alternative, a 7L Hybrid Active Neutral-Point Clamped Converter (7L-HANPC) (using both, 650V GaN HEMTs and 200V Si MOSFETs). All three systems are realized as hardware demonstrators for the same specifications, i.e., for integration into a Permanent Magnet Synchronous Motor (PMSM) with a case temperature of 90∘C , 7.5kW nominal output power at > 99% efficiency and a short-term overload capability of three times the nominal current for 3s . Thereby, the efficiencies and the thermally critical overload capability are experimentally verified. Overall, the 3L-FCC shows the best performance trade-off with lowest complexity and/or highest reliability and minimal control effort.
Publications 1 - 10 of 108