Abstract
Three criteria, including charging time, effective charging capacity and charging energy efficiency, are introduced to evaluate the CC (constant current) and CC/CV (constant current/constant voltage) charging strategies. Because the CC strategy presents a better performance and most resonant topologies have the CC characteristic, the CC strategy is more suitable for the design of wireless charging systems than the CC/CV strategy. Then, the state space model of the receiver is built to study the system dynamic characteristics, and the design of nonuse output filter capacitors is proposed, which can improve the system power density and avoid the drop in efficiency caused by capacitor degradation. At last, an electrochemical impedance spectrum (EIS) based analysis method is introduced to validate that the design without output filter capacitors has no effects on the battery characteristics when the charging frequency is higher than 460 Hz. A prototype is fabricated to verify our research results.
Highlights
Wireless power transfer is becoming more and more popular in our daily life
A state space model is built to study the systematic characteristics in this paper, and we further propose a new design without the output filter capacitors to reduce the volume and weight of the receiver
The CC strategy is compared with the CC/CV strategy based on three criteria, including the charging time, the charging capacity and the charging energy efficiency
Summary
Wireless power transfer is becoming more and more popular in our daily life. It is widely used in medical implantation [1,2], industrial and consumer electronics [3], and wireless sensor networks [4], Energies 2015, 8 and it is suitable for vehicular power battery charging as it can remove the troublesome plug-in process, provide an inherent electrical isolation and adapt to harsh environments [5].The wireless power transfer technique discussed in this paper is based on electromagnetic induction, which conforms to Faraday’s and Ampere’s laws [6]. Wireless power transfer is becoming more and more popular in our daily life. It is widely used in medical implantation [1,2], industrial and consumer electronics [3], and wireless sensor networks [4], Energies 2015, 8 and it is suitable for vehicular power battery charging as it can remove the troublesome plug-in process, provide an inherent electrical isolation and adapt to harsh environments [5]. Metamaterial has become a new hot spot in wireless power transfer systems [17,18], which acts as a “superlens” to increase the mutual inductance, and the transfer efficiency
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
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 callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
