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Nowadays Wireless Power Transfer (WPT) system using magnetic resonant coupling has become highly-anticipated. This paper investigates the negative effects of cross coupling in multi-receiver WPT systems, and proposes a Cross Coupling Cancellation (CCC) method to eliminate it at all frequencies. Simulations and experiments have been executed to verify the method.
In an Inductive Power Transfer (IPT) system, the magnetic design of the primary and secondary pads is an important factor that determines the power transfer capability. This paper proposes a DD2Q power receiver coil set, a novel three coil magnetic pad that comprises a classical DD winding and two additional quadrature windings placed at the secondary side (referred to as 2Q). The DD2Q coil set achieves...
Three-phase electric power (three-phase) is an essential technology for high power electric wiring. Three-phase, however, has not been attached to wireless power transfer (WPT). The authors suggest that characteristics of three-phase system are suitable for high power WPT with magnetic resonant coupling. Three-phase WPT has three times as large capacity as conventional single-phase WPT has. The power...
Power transfer between two resonators - a transmitter and a receiver- can occur through sympathetic resonance of their near EM fields. Remarkably, the power transfer efficiency is limited by the product of the quality factors Q, of the transmitter and receiver and the coupling coefficient k. In this work, we evaluate the efficiency limit first, for an inductively coupled system consisting of a single...
In this paper, we discuss the effect of the number of hops on the power division in wireless power transfer via magnetic resonance based on the electric circuit theory. First, a power division ratio (PDR) of single-hop power transfer to multiple receivers is addressed by using an equivalent circuit. The PDR of each receiver is shown to be inversely proportional to load resistances. Secondly, the PDR...
In this paper, the principle of wireless power transmission technology based on resonant coupling is discussed. A simplified equivalent circuit modeling for wireless power transmission system is established. A resonator constituted by single-layer helical coils is designed and investigated. Based on experiments, the output load voltage correlated with different distance, driving frequency and disalignment...
In this paper, a novel human position estimation system using electric-field resonance coupling is proposed. There are various advantages of using electric-field for human position estimation system. The system is robust to illumination change, body-worn tags are not required and sensors could be hidden since electric-field can path through an insulator. Tags are not required because the system estimates...
Current mode (CM) scheme provides suitable alternative for the high speed on-chip interconnect signaling. This paper presents a energy-delay optimization methodology for the current-mode (CM) signaling scheme. Optimization for the CM circuits for on-chip interconnects requires a joint optimization of driver and receiver device sizes, as their parameters which affect the energy-delay performance depend...
In this paper, the design of a compact planar bandpass filter above a defected ground plane is presented. The filter is designed as a combination of microstrip resonators and exploits the properties of a planar electromagnetic bandgap (EBG) structure patterned unto the ground plane of the printed circuit board material to provide a very wide stopband of up to 5 times the fundamental frequency. The...
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