Recently,.contactless.energy.transfer.(CET).systems.have.been.developed.and.investigated.widely.[see. list.of.References]..This.innovative.technology.creates.new.possibilities.to.supply.mobile.devices.with. electrical.energy.because.elimination.of.cables,.connectors,.and/or.slip.rings.increases.reliability.and. maintenance-free. operation. of. such. critical. systems. as. in. aerospace,. biomedical,. and. robotics. applications..Figure.35.1.shows.a.classification.of.the.CET.systems. As.“medium”.for.CET.could.be.used.electromagnetic.waves,.including.light,.acoustic.waves.(sound),. as.well.as.electric.fields..In.the.most.popular.applications,.the.core.of.CET.system.is.inductive.or.capacitive. coupling.between.power.source.and.load,.and.high.switching.frequency.converter. The.capacitive.coupling.(Figure.35.2b).is.used.in.low.power.range.(e.g.,.supply.systems.for.sensors). whereas. inductive.coupling.(Figure.35.2a).allows.transferring.power.from.a. few.milliwatts.up.to. hundred.kilowatts.[20]..It.should.be.noted.that.there.is.no.commonly.accepted.nomenclature.in.CET. systems..Some.authors.use.the.term.“wireless”.[1,5,16,21,32–34].instead.of.“contactless”.energy.transfer.or. power.supply..However,.the.term.“wireless”.energy.transfer.(or.power.supply).is.used.mostly.to.describe. systems.where.energy.is.transferred.on.longer.distances.(several.meters),.like.for.cellular.phones.or. wireless.sensor.technologies.[5,20,34]. In.this.chapter,.only.inductive coupled.CET.systems.are.discussed..The.potential.applications.for.such. a.technology.are.practically.endless.and.can.range.from.the.transfer.of.energy.between.low-power.home. 35