Abstract
An omnidirectional magnetically coupled resonant wireless power transfer (WPT) system based on rotary transmitting coil is presented. The proposed scheme can ease the variations of the transfer efficiency and output power caused by the deviation of transfer direction, and improve the unbalanced power distribution phenomenon between the receivers, which are still not fully achieved in current WPT systems. The modified coupled-mode model is built first to describe the non-rotary multi-receiver WPT system. The analysis indicates that the transfer efficiency and output power of the system can be expressed as functions of the deviation angle between the transmitting coil and receiving coil, which has a non-negligible influence on the system performances. Then, the modified high order coupled-mode model containing time-varying parameters about the deviation angle is derived for the proposed omnidirectional WPT system. Theoretical analysis and simulated results indicate that this system can transfer power to multiple receivers around the transmitter synchronously and evenly, which is very suitable for wireless charging for household appliances indoors. The scheme feasibility and theoretical analysis are verified by experimental results.
Highlights
These years wireless power transfer (WPT) field has witnessed a great progress in many fields, especially in low power applications
Lin et al [10,11,12] proposed 2-D and 3-D WPT systems to realize omnidirectional wireless charging with multiple transmitters
This paper proposes an omnidirectional magnetically-coupled resonant WPT system based on rotary transmitting coil, where the rotary coil is driven by an electric motor
Summary
These years WPT field has witnessed a great progress in many fields, especially in low power applications (such as medical implants [1,2] and mobile devices [3,4]). Lin et al [10,11,12] proposed 2-D and 3-D WPT systems to realize omnidirectional wireless charging with multiple transmitters These schemes utilize load detecting technology, which needs complicated control method to achieve the aim, and only one receiver can pick up power with high efficiency. This paper proposes an omnidirectional magnetically-coupled resonant WPT system based on rotary transmitting coil, where the rotary coil is driven by an electric motor This scheme can realize omnidirectionality and transfer power to multiple receivers simultaneously, evenly and efficiently, which can be applied in household multi-application environment. A high order coupled-mode model containing time-varying parameters about the deviation angle is established to describe the proposed omnidirectional single-receiver and multi-receiver WPT systems. The scheme feasibility and theoretical analysis have been identified by the experimental results
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