Abstract
Wireless power transfer (WPT) using magnetic resonant coupling technology, came into focus promptly by virtue of its long transfer distance, and its non-radiative and high-efficiency power transfer. The impedance matching has been studied in the literature in recent years. However, there is no suitable way to reach the optimum load in reality. In this paper, a new method is proposed to maximize the power transfer ability of a given pair of coupled coils. An analytical calculation of the mutual inductance is presented accurately with respect to the angled concentric multiple-turn printed spiral coils (PSC). In addition, the experimental results were in good agreement with the circuit simulation. Finally, a WPT experiment setup working at 3MHz resonance was established. The experiment results verified that the maximum transfer efficiency at fixed distances can be easily achieved by adjusting the angle to reach impedance matching. Compared to prior to optimization, the maximum improved efficiency was improved by 11%.
Highlights
Wireless power transfer (WPT) based on the magnetic resonance was reported by Nicola Tesla a century ago
It was proven theoretically that the transfer efficiency represented by scattering parameters can represent the traditional electrical transfer efficiency in the limit case
When compared to the situation prior to to optimization, the maximum improved efficiency was improved by 11%
Summary
Wireless power transfer (WPT) based on the magnetic resonance was reported by Nicola Tesla a century ago. It has been found that the basic analysis of WPT technology, mainly coupling mode theory (CMT) [1] and circuit theory (CT) [11] need to be optimized further. With in-depth study of the MCR-WPT technology, many problems such as frequency splitting, impedance matching, enhance transfer efficiency and system stability have risen [12,13,14,15], especially with regard to transfer efficiency, which decreases sharply with the increases in transmission distance. This seriously hinders the development of WPT technology
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call