Journal: IEEE Transactions on Power Electronics

Abbreviation

IEEE trans. power electron.

Publisher

IEEE

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ISSN

0885-8993
1941-0107

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Publications1 - 10 of 129
  • Novel Three-Phase Electronic Transformer
    Item type: Journal Article
    Menzi, David; Yang, Aobo; Chhawchharia, Saransh; et al. (2024)
    IEEE Transactions on Power Electronics
    Electronic transformers enable galvanic isolation and voltage level adaption at high frequency, and thus the magnetic core volume and weight can be reduced substantially compared to traditional transformers operating at the grid frequency. This article introduces a novel phase-modular single-stage three-phase electronic transformer (3Φ-ET) which advantageously enables the use of standard power transistors with unipolar voltage blocking capability. The output frequency is identical to the grid input frequency and the bidirectional power flow can be adjusted by means of a simple dual active bridge (DAB)-type modulation which results in inherently sinusoidal grid currents. The 3Φ-ET is thoroughly described and experimental waveforms with a 6 kW prototype system operated in a 400 V (rms, line-line) three-phase grid provide a proof of concept and verify the theoretical considerations.
  • Passive and Active Hybrid Integrated EMI Filters
    Item type: Journal Article
    Biela, Jürgen; Wirthmüller, Alexander; Waespe, Roman; et al. (2009)
    IEEE Transactions on Power Electronics
  • Cross-Forming Control and Fault Current Limiting for Grid-Forming Inverters
    Item type: Journal Article
    He, Xiuqiang; Desai, Maitraya Avadhut; Huang, Linbin; et al. (2025)
    IEEE Transactions on Power Electronics
    This article proposes a “cross-forming” control concept for grid-forming inverters operating against grid faults. Cross-forming refers to voltage angle forming and current magnitude forming . It differs from classical grid-forming and grid-following paradigms that feature voltage magnitude-and-angle forming and voltage magnitude-and-angle following (or current magnitude-and-angle forming), respectively. The cross-forming concept addresses the need for inverters to remain grid-forming (particularly voltage angle forming , as required by grid codes) while managing fault current limitation . Simple and feasible cross-forming control implementations are proposed, enabling inverters to quickly limit fault currents to a prescribed level while preserving voltage angle forming for grid-forming synchronization and providing dynamic ancillary services, during symmetrical or asymmetrical fault ride-through. Moreover, the cross-forming control yields an equivalent system featuring a constant virtual impedance and a “normal form” representation, allowing for the extension of previously established transient stability results to include scenarios involving current saturation. Simulations and experiments validate the efficacy of the proposed cross-forming control implementations.
  • 100 kHz Large-Signal Bandwidth GaN-Based 10 kVA Class-D Power Amplifier With 4.8 MHz Switching Frequency
    Item type: Journal Article
    Niklaus, Pascal S.; Kolar, Johann W.; Bortis, Dominik (2023)
    IEEE Transactions on Power Electronics
    Power amplifiers (PAs) are widely used, for example, to emulate the behavior of the power grid or electric machines under critical operating conditions, to measure the impedance of the power grid, or to generate specific impedance profiles in power-hardware-in-the-loop (P-HIL) tests. To accurately emulate dynamic effects and to characterize power electronic systems featuring wide-bandgap power semiconductors, PAs with very high output voltage quality and ever higher bandwidth (BW) at full output power are required, motivating the development of ultrahigh bandwidth power amplifiers (UHBW-PAs). While linear UHBW-PAs achieve very high signal fidelity and BW, they suffer from a tremendously bad efficiency, demanding large cooling effort and resulting in uneconomical operation, particular at high power levels and/or during long-term tests. Therefore, this article investigates possibilities for a switch-mode realization of UHBW-PAs with significantly higher efficiency and power density compared to existing solutions. There are two key concepts, namely series- and parallel-interleaving of multiple switching and/or converter cells, that allow to increase the effective switching frequency relevant to output filtering without increasing the individual device switching frequency that determines the per device switching losses. This article analyzes comprehensively the advantages and disadvantages of a combination of series- and parallel-interleaving in terms of losses, volume and complexity scaling. Finally, a UHBW-PA with 10 kVA output power (single-phase), a nominal rms output voltage of 230 V, a full-power BW of 100 kHz, very high output voltage quality (third and fifth harmonic < 2.5 V and < 1.2 V, respectively), an efficiency >95%, a power density of 25 kW/dm3 (410 W/in3), and a switching frequency of 4.8 MHz is presented. A hardware demonstrator is built and extensive measurements verify the system performance and confirm the calculation from the initial analyses with loss models.
  • EMI Filter Design for a Three-Phase Buck-Boost Y-Inverter VSD With Unshielded Motor Cables Considering IEC 61800-3 Conducted and Radiated Emission Limits
    Item type: Journal Article
    Menzi, David; Bortis, Dominik; Kolar, Johann W. (2021)
    IEEE Transactions on Power Electronics
    The standard converter concept employed in variable speed motor drives is the two-level three-phase Si insulated-gate bipolar transistor voltage source inverter with its switch nodes connected to the motor terminals via shielded cables to avoid excessive high-frequency noise emissions. However, high dv/dt pulses of the inverter pose substantial stresses on the motor, which are further intensified by the ever-faster switching speeds of wide band-gap semiconductors, hence promoting interest in inverters with full-sinewave output filters, which potentially enable the use of inexpensive unshielded motor cables. However, the IEC 61800-3 standard dictates stringent conducted and radiated emission limits on unscreened power interfaces. In this article, a dc input and ac output filter structure allowing operation with unshielded cables is derived for a phase-modular 11-kW buck-boost Y-inverter motor drive system employing 1.2-kV SiC MOSFETs with a switching frequency of 100 kHz. First, regulations and measurement techniques for conducted and radiated emissions of motor drives are analyzed. Next, the operating principle of the Y-inverter is described and an electromagnetic interference equivalent circuit is derived, followed by a systematic filter design. Finally, measurements are conducted on an ultracompact hardware prototype of the converter system with 12 kW/dm(3) (197 W/in(3)) power density, where the results indicate full compliance with the IEC 61800-3 conducted and radiated emission limits for operation with unshielded dc supply and motor cables in a residential area. © 2021 IEEE
  • Accurate Temperature Estimation of SiC Power mosfets Under Extreme Operating Conditions
    Item type: Journal Article
    Tsibizov, Alexander; Kovacevic-Badstuebner, Ivana; Kakarla, Bhagyalakshmi; et al. (2020)
    IEEE Transactions on Power Electronics
  • Asymmetric Interleaving in Low-Voltage CMOS Power Management with Multiple Supply Rails
    Item type: Journal Article
    Schuck, Marcel; Ho, Aaron D.; Pilawa-Podgurski, Robert C.N. (2017)
    IEEE Transactions on Power Electronics
  • PV-Module Integrated AC Inverters (AC Modules) with Subpanel MPP-Tracking
    Item type: Journal Article
    Leuenberger, David; Biela, Jürgen (2017)
    IEEE Transactions on Power Electronics
  • A Generalized Framework for Medium-Frequency Transformer Insulation Design: Case Study on Air Insulation
    Item type: Review Article
    Korthauer, Bastian; Biela, Jürgen (2026)
    IEEE Transactions on Power Electronics
    A key challenge in designing medium-frequency transformers (MFTs) is determining adequate insulation distances, especially as the insulation occupies a substantial fraction of the overall transformer volume. To ensure both efficient thermal management and high gravimetric and volumetric power density, these distances must be carefully optimized to be just sufficient for reliable operation. This paper presents a generalized framework to obtain such distances, suitable for integration into transformer design optimization routines. The framework employs a two-step procedure to compute universal design curves, enabling straightforward selection of the required insulation distance for a given design voltage. Using a foil-wound, air-insulated MFT as a case study and a physics-based model for discharge inception in air, a prototype is designed with a discharge level well below 10 pC at a design voltage of 8.5 kV. Compared to conventional design methods, the proposed approach permits up to six times higher design voltage while maintaining a safety margin exceeding 100% relative to the maximum one-minute withstand voltage.
  • Zero-Voltage-Switching Auxiliary Circuit for Minimized Inductance Requirement in Series-Resonant DC/DC Converter Systems
    Item type: Journal Article
    Schäfer, Jannik; Kolar, Johann W. (2021)
    IEEE Transactions on Power Electronics
    For power electronic converter systems, the cost and the size of the magnetic components are typically limiting factors when it comes to overall production costs and power density. This especially holds for soft-switching high-frequency applications, where a resonant discharge of the output capacitances of the semiconductors relies on sufficient amount of energy stored in the main magnetic components, i.e., inductors or transformers, yielding a substantial increase in their volumes. In this article, an alternative solution is introduced, where a small auxiliary circuit is used to ensure soft-switching of the power transistors, whereby the aforementioned volume of the main magnetic components can be significantly reduced. The proposed auxiliary circuit provides zero-voltage-switching conditions independent of the applied voltages, the switching frequency, and the output power level, without significantly increasing the circuit complexity or the control effort. The new concept is first analyzed based on simple analytical calculations and circuit simulations, and is then experimentally verified by means of hardware demonstrators related to a 3.6-kW 250–500V/250–500V series-resonant dc/dc converter application. Finally, it is shown that the auxiliary circuit can also be used to precharge the output capacitor of a converter system, which allows to further reduce the size of the main magnetic components.
Publications1 - 10 of 129