Abstract
Increasing the resonant frequency of a wireless power transfer (WPT) system effectively improves the power transfer efficiency between the transmit and the receive coils but significantly limits the power transfer capacity with the same coils. Therefore, this paper proposes a coil design method for a series-series (SS) compensated WPT system which can power up the same load with the same DC input voltage & current but with increased resonant frequency. For WPT systems with higher resonant frequencies, a new method of realizing soft-switching by tuning driving frequency is proposed which does not need to change any hardware in the WPT system and can effectively reduce switching losses generated in the inverter. Eighty-five kHz, 200 kHz and 500 kHz WPT systems are built up to validate the proposed methods. Experimental results show that all these three WPT systems can deliver around 3.3 kW power to the same load (15 Ω) with 200 V input voltage and 20 A input current as expected and achieve more than 85% coil-system efficiency and 79% system overall efficiency. With the soft-switching technique, inverter efficiency can be improved from 81.91% to 98.60% in the 500 kHz WPT system.
Highlights
Wireless power transfer (WPT) systems, which can transfer energy from a power source to isolated loads across air gap without any direct electrical contacts, are attracting more and more attention.They have been widely used to power up electrical equipment or recharge its batteries
Input current, load resistance and resonant frequency are determined, the required mutual inductance of the coil system can be derived from Equation (4) as the required mutual inductance of the coil system can be derived from Equation (4) as (U −Z I )Z
DC input voltage to power up the same load but at different resonant frequencies
Summary
Wireless power transfer (WPT) systems, which can transfer energy from a power source to isolated loads across air gap without any direct electrical contacts, are attracting more and more attention. WPT system help to increase the system resonanttofrequency affecting the system variouslevel; operating byasimply changing theto input impedance of theconditions inverter through tuning power (2) theconditions proposal of phase shift strategy create soft switching under various the driving frequency. This soft-switching realization method does not need to change any hardware operating conditions by changing the input impedance of the inverter through tuning the in the WPT systemThis andsoft-switching has a better realization applicability.
Sign-in/Register to view highlights & summary 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.
