Magnetic Field Tuning and Control for Wireless Power Transfer Using Inductive Tuning Plunger and Conical Coils

Multiple input wireless power transfer (WPT)system has drawn increased interests recently due to itsenhancing ability to the efficiency of power transfer. In mostcases, it uses a number of transmitters to deliver the... [ view full abstract ]

Multiple input wireless power transfer (WPT)system has drawn increased interests recently due to itsenhancing ability to the efficiency of power transfer. In mostcases, it uses a number of transmitters to deliver the wirelesspower efficiently. These transmitters can be massively used toharvest energy as much as possible and therefore reduces signaland link losses. Powering many devices using massive number oftransmitters allows cross coupling occurring. In particular,signals or magnetic fields are mutually induced betweentransmitters. The goal of this work is to provide an efficient linkfor wireless power transfer and compensate for the impact ofcross coupling. A tuned technique is proposed to optimize thetransmit signal for a conical coil transmitter. The proposedscheme efficiently delivers the wireless power by controlling thebeam of the magnetic flux. By using this new technique, we thenincrease the main loop gain of the wireless power signal andreduce the back gain for the receiver in such region. The resultsare compared to the conical coil. In addition, results illustratethat a tuned transmitter controls the magnetic flux pattern forefficient wireless power transfer.