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Due to the rising electrification, there is a need for innovative charging technologies to keep pace with technological progress and tethered charging. The electrical performance of wireless power transfer (WPT) systems is one crucial point in charging electric vehicles. The resonance frequency respectively the switching frequency of the converter has a large impact on system behavior. Due to component...
The paper describes a special method for testing power capacitors by means of their loading by alternating current with the effective value up to 100 A at frequencies in the order of units up to tens of kHz. There is described the realization of the test equipment enabling a precise compensation of the reactive power of the capacitor and the input minimisation at the testing. It discusses the realization...
In 1959, Wheeler published the theory of the radiansphere, which is the boundary between the far and near field with a distance of λ/2π from an antenna. The inside field of the radiansphere is mainly involved in the loss power and stored energy, while the outside field is concerned with the radiation power. Wheeler's theory is that the radiation power can be removed from the antenna without disturbing...
The next generation of wireless communication is a ubiquitous radio system concept, providing wireless access from short-range to wide-area, with one single reconfigurable and adaptive system for all envisaged radio environments. This paper presents the design approach of RCO (reconfigurable concurrent oscillator) that simultaneously generates two or more signals of different frequencies that eliminate...
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