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This paper investigates reactance compensation method to eliminate the impact of cross-coupling in single frequency inductive power transfer (IPT) system with arbitrary number of receivers. Receiver-side resonance loses its optimality in multiple receiver scenarios under the existence of significant cross-coupling among receivers. Therefore, the resonant capacitances are added with compensatory reactances,...
This paper investigates maximum achievable efficiency of inductive power transfer (IPT) system with arbitrary number of receivers. We derive the formulas of optimal loads and maximum efficiency based on N-port network model. Via analysis and computer simulations, we show that the cross-coupling among receivers does not affect system efficiency if load resistances and reactances are jointly optimized...
This paper proposes electromagnetic coupling for stabilizing the power transfer efficiency (PTE) of parallel line fed wireless power transfer (WPT). The conventional WPT system using magnetic coupled parallel line feeder suffers from PTE fluctuation due to magnetic field standing wave along the feeder line. Focusing on the fact that electric and magnetic fields are out of phase by 90 degrees, we propose...
This paper proposes a data transmission for parallel line fed wireless power transfer system. We focus on power receiver-to-source transmission link and employ the load modulation as a modulation scheme. To transmit data back to the power source from receiver, the power receiver periodically switches its load impedance to modulate the electric current, which can be observed at the source using envelope...
In parallel line fed wireless power transfer (WPT), power delivered to each receiver depends on load impedances and Z-parameters of all receivers in the feeding area. Centralized control for power distribution, which adjusts load impedances of all receivers according to their Z-parameters, is able to adjust the power distribution but suffers from a due to heavy control signaling. To reduce the control...
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