Inductive powering has been a reliable and simple method for
many years to wirelessly power devices over relatively short
distances, from a few centimetres to a few feet. Examples are found
in biomedical applications, such as cochlear implants; in RFID,
such as smart cards for building access control; and in consumer
devices, such as electrical toothbrushes. Device sizes shrunk
considerably the past decades, demanding accurate design tools to
obtain reliable link operation in demanding environments. With
smaller coil sizes, the link efficiency drops dramatically to a
point where the commonly used calculation methods become
invalid.
Inductive Powering: Basic Theory and Application to Biomedical
Systems lists all design equations and topology alternatives to
successfully build an inductive power and data link for your
specific application. It also contains practical guidelines to
expand the external driver with a servomechanism that automatically
tunes itself to varying coupling and load conditions.
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