Wireless Power Transmitter And Receiver Supporting 200-khz And 6.78-mhz Dual-band Operation Without Magnetic Field Canceling

May 24, 2017 - Ahn, Dukju; Kim, Seongmin; Kim, Sang-Won; Moon, Jungick; Cho, Inkui

Journal or Book Title: IEEE TRANSACTIONS ON POWER ELECTRONICS

Volume/Issue: 32

Year Published: 2017

The paper proposes a method to suppress the anticurrent and magnetic canceling in a dual-band transmitter (Tx) and receiver (Rx) for wireless power transfer. The problem of intracoupling between the two coils in a dual-band resonator is analyzed. During 6.78-MHz operation, the intracoupling causes antidirectional current at 200-kHz coil which cancels the magnetic field and degrades efficiency. To solve the problem of antidirectional current, a new resonator design method is proposed. The proposed technique suppresses the 6.78-MHz anticurrent by specially selecting the impedance values and coil-winding direction that manipulate the magnitude and phase of 6.78-MHz voltage, such that total voltage across 200-kHz path is zero. One of the advantages is that the spatial separation between 6.78-MHz coil and 200-kHz coil can be reduced, which allows the maximum diameter for inner coil. Also, smaller discrete inductor can be used. The two coils share an inverter (or a rectifier), thus minimizing the number of inverter and rectifier. The 24-W system with dual-band Tx achieves 70.3% and 70.8% efficiencies at 6.78 MHz and 200 kHz, respectively, whereas the system with dual-band Rx achieves 66.3% and 74.3% at 6.78 MHz and 200 kHz, respectively. The efficiency improvement due to anticurrent suppressing is 4.8 similar to 23.6%.

DOI: 10.1109/TPEL.2016.2629494

Type of Publication: Article

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Tag List
  • chans,
  • coupled human and natural systems,
  • intracoupling
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