Light transformers for kilowattt SMPS based on nanocrystalline softmagnetic cores

Ferch, M.

doi:10.1049/cp:19980560

Cited by 5 publications

(4 citation statements)

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“…These methodologies include special low-inductance self-clearing capacitors, low inductance high-frequency and high-voltage capacitors, high-frequency low-loss amorphous nanocrystalline transformers [6], resonant voltage multiplication techniques, resonant rectification, and snubberless IGBT switching. The design is fault tolerant; a shorted load detunes the resonance and maintains power flows that do not damage itself or the load.…”

Section: Discussionmentioning

confidence: 99%

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High-frequency multimegawatt polyphase resonant power conditioning

Reass

Bača

Gribble

et al. 2005

IEEE Trans. Plasma Sci.

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High-frequency multimegawatt polyphase resonant power conditioning techniques have recently been realized as a result of key component developments, cooperative efforts, research and development funding contracts, and newly applied engineering techniques. The first generation 10-MW pulsed converter-modulators, implemented at Los Alamos National Laboratory, Los Alamos, NM, are now utilized for the Oak Ridge National Laboratory, Oak Ridge, TN, Spallation Neutron Source (SNS) accelerator klystron radio frequency amplifier power systems [1]. Three different styles of polyphase resonant converter-modulators were developed for the SNS application. The various systems operate up to 140-kV, or 11-MW pulses, or up to 1.1 MW average power, all from a direct current input of + 1.2 kV. The component improvements realized with the SNS effort coupled with new applied engineering techniques have resulted in dramatic changes in overall power conditioning topology. As an example, the 20-kHz high-voltage transformers are less than 1% the size and weight of equivalent 60-Hz versions. With resonant conversion techniques, load protective networks are not required.A shorted load de-tunes the resonance which results in limited power transfer. This provides for power conditioning systems that are inherently self-protective, with automatic fault "ride-through" capabilities. By altering and iterating the Los Alamos design, higher power and continuous wave power conditioning systems can now be realized with improved performance and flexibility. This paper will examine the SNS engineering data, briefly review the underlying theory of polyphase resonant conversion techniques, and apply this knowledge to future system topologies.

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Section: Discussionmentioning

confidence: 99%

“…This is conveniently done by considering the current waveform in a single diode (for example ). Clearly, we can write (6) where is the average current in diode D1. Considering one half cycle of the input (Modes 1-9), the current in D1 can be determined as follows.…”

Section: Analysis Of Output Characteristicsmentioning

confidence: 99%

High-frequency multimegawatt polyphase resonant power conditioning

Reass

Bača

Gribble

et al. 2005

IEEE Trans. Plasma Sci.

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“…Core materials include silicon steel, amorphous, nanocrystalline, and ferrite, among others, could be used. However, the silicon steel core is the appropriate choice for high-power applications and optimally utilizes above the running frequency of 2 kHz, due to its cheap cost and acceptable core losses [24][25][26][27][28][29][30][31].…”

Section: Higher Frequency Isolationmentioning

confidence: 99%

Power Density Enhancement of Three-Phase Rectifier Using Higher Frequency Solid State Transformer

Sabry,

Alsammak

2024

MMEP

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This article introduces an isolated three-phase six-pulse rectifier using a solid-state transformer. The line frequency utility grid voltage is modulated by a frequency boost converter. This converter exists two parts. The first part is the rectifier section, and the second one is the inverter section. Then after, three-phase diode rectifier is powered by the medium frequency transformer 2 kHz to shrink the transformer size upto 20% or even 10% depensing to the frequency operating range for silicon steel core materials. The aim of this study is to shrink the occupied size of the rectifier using a higher frequency transformer. The study realizes that the grid line current has the same frequency contents as a regular three phase rectifier. In other words, the presented idea results in smaller weight and size while sustaining the performance of input current total harmonic distortion THD=31%. High power density power electronics converter would be extremely valuable for applications such as electric vehicle railways and aircraft. The proposed approach is reliable and easy to use. The solid-state transformer contributes to isolating and improving the overall converter's power density. Simulation results for the 16 kW converter were verified using MATLAB Simulink.

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“…They compared the performance of different core materials, including nanocrystalline, amorphous, and permalloy materials, and highlighted the benefits of using Vitroperm, a nanocrystalline magnetic material produced by Vacuumschmelze. In 1998, Ferch [ 29 ] reported on the use of nanocrystalline SiFe alloy Vitroperm cores in light transformers for switched-mode power supplies operating at a frequency of 10–20 kHz. This resulted in a more compact and lightweight system with significantly higher frequency capabilities.…”

Section: Developing High-frequency High-power-density Transformers Wi...mentioning

confidence: 99%

Developing High-Power-Density Electromagnetic Devices with Nanocrystalline and Amorphous Magnetic Materials

et al. 2023

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With the increasing demand for smaller, lighter, and more affordable electromagnetic devices, there is a growing trend toward developing high-power-density transformers and electrical machines. While increasing the operating frequency is a straightforward approach to achieving high power density, it can lead to significant power loss within a limited volume, resulting in excessive temperature rise and device degradation. Therefore, it is crucial to design high-power-density electromagnetic devices that exhibit low power loss and efficient thermal dissipation to address these challenges. Advanced techniques, such as the utilization of novel and advanced electromagnetic materials, hold great promise for overcoming these issues. Specifically, nanocrystalline and amorphous magnetic materials have emerged as highly effective solutions for reducing power loss and increasing efficiency in electromagnetic devices. This paper aims to provide an overview of the application of nanocrystalline and amorphous magnetic materials in transformers and electrical machines, along with key technologies and the major challenges involved.

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Light transformers for kilowattt SMPS based on nanocrystalline softmagnetic cores

Cited by 5 publications

References 0 publications

High-frequency multimegawatt polyphase resonant power conditioning

High-frequency multimegawatt polyphase resonant power conditioning

Power Density Enhancement of Three-Phase Rectifier Using Higher Frequency Solid State Transformer

Developing High-Power-Density Electromagnetic Devices with Nanocrystalline and Amorphous Magnetic Materials

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