For more than a century it has been known that signals and power
can be transferred electromagnetically. This knowledge has
motivated substantial research and development into wireless signal
transmission which today is widely used. Power transfer across air
gaps, however, has tended to be restricted to electric machines
that have tight magnetic couplings. It is only very recently that a
novel technology termed IPT (Inductive Power Transfer) has made
wireless/contactless power delivery to movable objects a practical
reality. This research work presents the basic concept of
contactless/wireless power transfer and typical IPT systems that
employ modern power conversion, control, and magnetic coupling
techniques to achieve clean and reliable power transfer without
direct electrical contacts. Both current-fed parallel and
voltage-fed series resonant converters are fully investigated using
mathematical analysis, computer simulations, and practical
experiments to evaluate their properties and usability in practical
systems. Two new resonant converters are proposed which show
excellent dynamic soft switching performance suitable for
wireless/contactless power transfer applications.
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