Abstract
A method of power transmission is proposed that delivers power through the resonance of a helical receiver with its surrounding stray capacitance. The system operates in a quasi-wireless state where power is transferred over a single connection to a surface much larger than the dimensions of the receiver. This ensures high-efficiency energy transfer over large areas without the need of strong coupling electromagnetic fields. Standard power connectors such as tracks, plugs, and cords may be easily replaced with conductive surfaces or objects such as foil sheets, desks, and cabinets. Presently, the method is experimentally demonstrated at the small scale using loads of up to 50 W at an efficiency of 83% with both bare and insulated surfaces. Simple circuit modeling of the system is presented which shows close agreement with experimental results.
Highlights
The proliferation of electronic devices in our digital age has necessitated more convenient methods of power transmission
To fill the void of large area, multi-load power transfer without the use of interconnected cables, we propose a technique based on single-wire no-return power transmission (SWNR)
The maximum input voltage applied to an insulated aluminum sheet was 144 VRMS and 73 VRMS for the desk and cabinet
Summary
The proliferation of electronic devices in our digital age has necessitated more convenient methods of power transmission. One technology currently filling this need is resonant induction power transfer (IPT), which can trace its origins to the late-19th century [1] In this technique, electrical power is transmitted over short distances using resonant magnetic coupling between two coils [2, 3]. In order to implement IPT in large scale multi-load situations, either a large coil would need to be constructed that encompasses the entire area, sacrificing transfer efficiency through reduced coupling; or the entire area would need multiple imbedded transmitters. Both the wiring complexity and cost associated with such endeavors makes either option impractical
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