PublisherIEEE Press. Institute of Electrical and Electronics Engineers
Rights accessRestricted access - publisher's policy
Recent improvements in semiconductor technology
make efficient switching possible at higher frequencies, which
benefits the application of wireless inductive energy transfer.
However, a higher frequency does not alter the magnetic coupling
between energy transmitter and receiver. Due to the still weak
magnetic coupling between transmitting and receiving sides that
are separated by a substantial air gap, energy circulates in the primary
transmitting side without being transferred to the secondary
receiving side. This paper introduces an energy control method
that reduces energy circulation in the primary to zero. Themethod
makes use of the fact that energy can be stored in a magnetic
field by the primary side and absorbed by the secondary side.
Furthermore, the secondary side converter topology is modified
in order to boost the damping as seen by the primary converter
at required times. Essentially, the control method realizes an energetic
coupling factor of one between the air coils of the wireless
transformer. The working principle of the controlmethod has been
verified with an experimental setup.
CitationVan Der Pijl, F.; Bauer, P.; Castilla, M. Control method for wireless inductive energy transfer systems with relatively large air gap. "IEEE transactions on industrial electronics", 2013, vol. 60, núm. 1, p. 382-390.
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