Results 311 to 320 of about 1,713,151 (356)

High-Frequency Impedance Transformations

2010
Active devices such as transistors or Op-Amps have bandwidth limitations that can result in instability or undesirable dynamic response in feedback circuits. As gain decreases with frequency, feedback-amplifier port-resistance values also change and effectively become reactive. These bandwidth-related reactances can resonate with other circuit elements.
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A Study on High Frequency Transformer Design in Medium-voltage Solid-state Transformers

2018 Asian Conference on Energy, Power and Transportation Electrification (ACEPT), 2018
High switching frequency (HF) operation of solid-state transformers (SSTs) reduces the weight and volume of magnetic parts. Yet in medium-voltage (MV) SSTs, electrical insulation becomes a great concern and demands extra spacing.
Chih-Shen Yeh, J. Lai
semanticscholar   +1 more source

High-frequency thin-film piezoelectric transformers

2012 IEEE International Frequency Control Symposium Proceedings, 2012
A voltage step-up/impedance transformer is presented which operates by modifying the electrode configuration of lateral-extensional mode thin-film piezoelectric-on-substrate (TPoS) resonators. The individual electrode pairs that cover the stress concentration areas of a 10th order harmonic 30MHz resonator are connected in series at the output port to ...
Hediyeh Fatemi, Reza Abdolvand
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Design considerations for high power high frequency transformers

21st Annual IEEE Conference on Power Electronics Specialists, 2002
Various design considerations for high-power (multikilowatt), high-frequency transformers for DC-DC power converters are investigated. Although Ferrite (PC40) is lossier than Permalloy80 (0.5 mil) at the frequencies of interest (25-50 kHz) the use of the former is justified on the basis of cost, weight, and wide ranges of shapes.
M.H. Kheraluwala, D.W. Novotny, D.M. Divan   +2 more
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Calculation of Leakage Inductance for High-Frequency Transformers

IEEE Transactions on Power Electronics, 2015
Frequency-dependent leakage inductance is often observed. The high-frequency eddy current effects cause a reduction in leakage inductance. The proximity effect between adjacent layers is responsible for the reduction of leakage inductance. This paper gives a detailed analysis of high-frequency leakage inductance and proposes an accurate prediction ...
Ouyang, Ziwei, Zhang, Jun, Hurley, William Gerard   +2 more
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High voltage, high frequency transformer switching converter integration

IET Conference on High Power RF Technologies, 2009
This paper presents a high voltage (HV), high frequency (HF) transformer with high voltage rectifier. The described systems employ a low profile HV, HF transformers and voltage bridge technology multiplier. A model of the converter of 150 kW is presented and verified by Saber simulator.
T. Filchev, D. Cook, J. Clare, P. Wheeler   +3 more
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Gabor transform for interictal high frequency oscillations classification

2015 International Conference on Advances in Biomedical Engineering (ICABME), 2015
Interictal High Frequency Oscillations (HFOs [30–600 Hz]) have been recently used as reliable biomarkers for epileptogenic zones. Intra- and inter-subject variations represent the main source of HFOs diversity in terms of spectral and temporal characteristics. According to spectral characteristics, HFOs are usually classified into four sub-bands: gamma,
Jrad, Nisrine, Kachenoura, Amar, Merlet, Isabelle, Wendling, Fabrice   +3 more
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High-frequency power transformer modeling

2013
The detailed study of high-frequency over- voltages propagating inside the electrical systems of a power plant requires a precise modeling of power transformers at high frequencies. These over- voltages may originate from lightning overvoltage propagating along the transmission line and crossing the step-up transformer, they may originate also for ...
Filipović-Grčić, Božidar, Uglešić, Ivo, Jurišić, Bruno   +2 more
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An ultimate high frequency transformer

1992. Digests of Intermag. International Magnetics Conference, 1992
H. Saotome, T. Ogawa, S. Hayano, Y. Saito   +3 more
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New, high frequency transformer topologies

Proceedings:Electrical Electronics Insulation Conference and Electrical Manufacturing & Coil Winding Conference, 2002
J. Masi, W. Thibault
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