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Propagation of high frequency overvoltages in transformers
2014 ICHVE International Conference on High Voltage Engineering and Application, 2014In modern grids and networks more and more switching and reconfiguration operations are present. In addition external stresses like lightning may cause overvoltages. Thus, such transients may subject the electric insulation system of power equipment.
M. Florkowski +3 more
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Design and Thermal Analysis of a High-Voltage High-Frequency Transformer
IECON 2025 – 51st Annual Conference of the IEEE Industrial Electronics SocietyHigh-voltage high-frequency (HVHF) transformers are one of the crucial components in HVDC power supplies. However, they occupy more space, and compared to other components in the system, they experience more energy losses. HVHF transformers need special attention to both thermal and electrical properties, mainly because of the use of ferrite cores ...
Shan, A. +4 more
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High-Frequency Impedance Transformations
2010Active 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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Analysis of high-frequency resistance in transformers
20th Annual IEEE Power Electronics Specialists Conference, 2003An accurate, analytical method is proposed for calculating the lead and winding high-frequency resistance of complex transformer constructions. High-frequency resistance is derived from the resulting matrix system equations, common to the leads and windings. The effect of eddy currents in the leads is confirmed by theoretical results.
K. Sakakibara, N. Murakami
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Modeling of high-frequency micro-transformers
IEEE Transactions on Magnetics, 2004A dynamic model has been developed to predict the efficiency of a micro-transformer, operating at 5 MHz. The model includes a core hysteresis model, core eddy current model and winding copper loss model. Measurements and finite element analysis were carried out in order to validate the model.
null Ningning Wang +5 more
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High-frequency planar power transformers
IEEE Transactions on Power Electronics, 1992High-frequency transformer design using the transmission line transformer (TLT) is described. Utilizing transmission line circuit theory, the characteristics of the TLT for different turn ratios are given, and its advantages, including its wideband nature, are discussed. TLT prototypes with turn ratios of 2:1, 3:1, and 5:1 were designed and fabricated.
M.A. Morrill, V.A. Caliskan, C.Q. Lee
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An ultimate high frequency transformer
1992. Digests of Intermag. International Magnetics Conference, 1992H. Saotome +3 more
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High-frequency power transformer modeling
2013The 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 +2 more
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Learning Spatial-Frequency Transformer for Visual Object Tracking
IEEE Transactions on Circuits and Systems for Video Technology, 2023Chuanming Tang +2 more
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