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 - 2026117
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Publications1 - 10 of 117
  • 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)
  • Fundamentals and Application Oriented Evaluation of Solid State Transformer Concepts
    Item type: Presentation
    Kolar, Johann W.; Huber, Jonas; Guillod, Thomas (2021)
  • Automatic Time-Division Multiplexing for Inductive Power Transfer to Multiple Stainless-Steel-Enclosed Receivers
    Item type: Journal Article
    Xu, Junzhong; Miric, Spasoje; Bortis, Dominik; et al. (2024)
    IEEE Journal of Emerging and Selected Topics in Power Electronics
    Linear actuators employed in the food-processing or pharmaceutical industry must be enclosed in stainless steel (SS) for hygienic reasons. Therefore, cables and cable carriers should be avoided and wireless, i.e., inductive power transfer (IPT) should be employed. To achieve high efficiencies, the magnetic field components of the IPT system should be oriented parallel to the SS enclosures, which can be achieved with a coaxial arrangement of closed magnetic cores mounted on the moving part/slider and a stationary primary winding. As an alternative to the typically employed current-impressed operating modes of IPT systems with a constant primary-winding current that limits part-load efficiency, the high magnetic coupling of this arrangement facilitates operation as an isolated constant-voltage-transfer-ratio series-resonant dc-dc converter, i.e., a dc transformer (DCX). However, then, only a single receiver can receive power at any given time, and a time-division multiplexing (TDM) method is needed to supply multiple receivers with power in a cyclic manner. This article proposes a novel automatic TDM (A-TDM) method that, unlike previous TDM methods, does not require any communication link nor a central controller. The new method is verified during startup, steady-state operation, and under load transients using an exemplary SS-enclosed IPT system with two 100 W receivers.
  • Comparative Evaluation of Minimum Conduction Losses of Battery-Integrated Multilevel Inverters
    Item type: Conference Paper
    Herzog, Rahel; Kolar, Johann W.; Huber, Jonas (2025)
    2025 14th International Conference on Renewable Energy Research and Applications (ICRERA)
    Conventionally, high-voltage batteries are interfaced to ac systems (e.g., motors or the mains) via three-phase dc-ac inverters. Recently, battery-integrated multilevel inverters (BIMIs) have attracted interest by distributing the power electronics within the battery: each battery cell (or group of battery cells) is equipped with a low-voltage switching stage, and the resulting modules are cascaded into one string per phase. A first variant uses fullbridge (FB) switching modules with four switches each, whereas a second option termed “BM3” requires only three instead of four switches per module, which restricts the string output voltage to positive values and hence doubles the number of modules compared to the FB-BIMI (for equal ac output voltage capability), but facilitates paralleling of battery cells for lower instantaneous string output voltages. This paper first derives the optimal BM3BIMI configurations for a given number of modules, minimizing conduction losses. Then, for equal total silicon (Si) chip area, an FB-BIMI still exhibits 10−30% lower conduction losses (depending on the modulation index) than a BM3-BIMI. To compare systems with different semiconductor materials, i.e., a two-level (2L) silicon carbide (SiC) inverter and BIMIs with Si switches, a possible characteristic is the embodied energy per semiconductor die area, which is closely related to the embodied carbon footprint and also related to cost. Targeting equal total embodied carbon footprint of the power semiconductors, a BIMI can thus use 3.25 times more Si chip area than a 2 L SiC inverter (225 kW,800 V dc) with a dc-side battery, which then achieves almost a factor of five lower total losses-even when including switching losses-than an FB-BIMI at nominal current. Furthermore, due to their phasemodular nature, BIMIs introduce strong low-frequency pulsations in the battery power flow, leading to approximately twice the battery losses compared to a 2L-based system using the same number of battery cells.
  • Advanced Synergetic Charge Control of Three-Phase PFC Buck-Boost Current DC-Link EV Chargers
    Item type: Conference Paper
    Zhang, Daifei; Cao, Danqing; Huber, Jonas; et al. (2022)
    2022 IEEE 23rd Workshop on Control and Modeling for Power Electronics (COMPEL)
    An advanced synergetic charge-based mains cur-rent control (ASC) for three-phase power factor correction (PFC) buck-boost current DC-link AC/DC converters, which integrate a front-end buck-type current DC-link PFC rectifier and a DC/DC boost converter output stage, is proposed. The charge control is embedded in the synergetic (coordinated) control of the two converter stages, retaining all advantageous features such as only a minimum number of switches operating at any given time and a seamless transition between buck-and boost-mode. Compared to conventional synergetic current control (CSC) with synchronous sampling or oversampling, the ASC achieves an reduction of the AC-side current harmonics (simulated total harmonic distortion lower by up to 30 %) for operation over a wide output voltage range from 200 to 1000 V without increased implementation complexity or hardware cost. Furthermore, the ASC improves the light-load efficiency by inherently enabling a smooth transition into discontinuous conduction mode (DCM) without additional modifications of the control structure. Finally, the proposed ASC can control a system featuring significantly higher DC-link current ripples without a degradation of the grid current quality, which facilitates more compact DC-link inductor and hence converter realizations.
  • Three-Phase SiC/GaN Converter Systems – There is No Boogeyman Under the Bed
    Item type: Other Conference Item
    Kolar, Johann W.; Huber, Jonas; Menzi, David (2021)
  • A Three-Phase Synergetically Controlled Buck-Boost Current DC-Link EV Charger
    Item type: Journal Article
    Zhang, Daifei; Huber, Jonas; Kolar, Johann W. (2023)
    IEEE Transactions on Power Electronics
    With the ever-increasing share of electric vehicles (EVs) comes a need for highly efficient and compact EV chargers. EV charger modules should provide a wide-output-voltage range (200-1000 V) to ensure compatibility with various EV battery voltages. Thus, buck-boost functionality is needed, which can advantageously be realized by a current DC-link topology; a buck-type current-source rectifier (CSR)-stage and a downstream three-level boost-type DC/DC-stage share the main magnetic component (the DC-link inductor). Furthermore, the two stages can operate collaboratively; for low output voltages, the CSR-stage controls the output voltage and the DC/DC-stage is clamped to avoid switching losses; for high output voltages, the DC/DC-stage shapes the DC-link current such that the CSR-stage operates with 2/3-PWM (switching limited to two out of the three phases) and, hence, with reduced switching losses. This article, thus, introduces a simplified synergetic control concept that ensures this loss-optimum operation of the two-stage system for any output voltage. A compact 10-kW hardware demonstrator with a power density of 6.4 kW/dm 3 (107.5 W/in 3) is then used to verify the control concept and the seamless transitions between operating modes. For the first time, a system-level experimental demonstration of the loss savings achieved by 2/3-PWM is provided, and the precompliance conducted EMI test results meet CISPR 11 Class A. Moreover, a detailed experimental characterization of losses/efficiency over the full range of output voltage and power confirms the loss models and the design procedure presented earlier. Finally, the demonstrator shows quite a flat efficiency characteristic (higher than 98% for most operating points with output voltages above 400V and more than 25% of rated load) with a peak efficiency of 98.8% at 520 V output voltage and 5 kW. All in all, the presented current DC-link buck-boost PFC rectifier system features a promising solution for future isolated or nonisolated EV charger modules.
  • Solid-State Transformers - Fundamentals, Industrial Applications, Challenges
    Item type: Other Conference Item
    Kolar, Johann W.; Huber, Jonas (2022)
  • Comparative Evaluation of MVAC-LVDC SST and Hybrid Transformer Concepts for Future Datacenters
    Item type: Conference Paper
    Huber, Jonas; Wallmeier, Peter; Pieper, Ralf; et al. (2022)
    2022 International Power Electronics Conference (IPEC-Himeji 2022- ECCE Asia)
    A transition from state-of-the-art 400 V AC to 690 V AC or 800 V DC (+/- 400 V DC) distribution improves the overall power conversion efficiency of datacenter power supply systems. The latter requires megawatt-level isolated medium-voltage (MV) AC to low-voltage (LV) DC conversion stages that operate with an efficiency of at least 98 AD. Whereas today's most advanced industrial MVAC-LVDC solid-state transformer (SST) prototypes do achieve this, they are highly complex and do not show any clear advantages in terms of efficiency and power density over alternative approaches that retain the low-frequency transformer (LFT) to provide isolation and decoupling from harsh MV grid realities. We thus comparatively evaluate MVAC-LVDC SSTs against such alternative concepts, i.e., LFTs with LV-side SiC PFC rectifiers, or 12-pulse rectifier systems hybridized with active filters that just provide sufficient power processing capability to achieve unity power factor operation.
  • Synthesis of Low-Switch-Count Power Converter Topologies
    Item type: Conference Paper
    Leibl, Michael; Huber, Jonas; Menzi, David; et al. (2023)
    2023 11th International Conference on Power Electronics and ECCE Asia (ICPE 2023 - ECCE Asia)
    A systematic method is presented for synthesizing power converter topologies, using only a low number of semiconductor devices. The method is based on a single-switch elementary converter that can be used as a power converter building block. It is shown, that many well known converter topologies can be synthesized using the method. Furthermore, two novel single-phase power factor correction (PFC) rectifier topologies are synthesized, their basic control principles are demonstrated and results from circuit simulations are provided, verifying the functionality. The newly found topologies require only half the number of semiconductor devices, compared to conventional solutions, while still providing clamped voltages to all power semiconductors during their off state. The proposed synthesizing method can be applied to AC-DC, DC-DC, isolated and non-isolated, dual- and multi-port converters.
Publications1 - 10 of 117