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http://dx.doi.org/10.7471/ikeee.2018.22.2.393

A design of rectifier for WPC/A4WP wireless power transfer  

Park, Joonho (Dept. of Electronics Engineering, Soongsil University)
Moon, Yong (Dept. of Electronics Engineering, Soongsil University)
Publication Information
Journal of IKEEE / v.22, no.2, 2018 , pp. 393-401 More about this Journal
Abstract
In this paper, a rectifier for WPC / A4WP wireless power transmission is designed. The proposed rectifier supports both WPC (Wireless Power Consortium) and A4WP (Alliance For Wireless Power) and is designed with full-bridge rectifier. WPC transmits power at the frequency of 100kHz to 205kHz and A4WP at the frequency of 6.75MHz. Since the bridge rectifier uses a MOSFET instead of a diode, the reverse current flows and the efficiency is affected if the output voltage is higher than the input voltage. Therefore, we added the reverse current detector that detects the current flowing through the MOSFET and shut off the reverse current. The frequency discriminator is used because the rectifier has different frequency band. The proposed rectifier was designed using $0.35{\mu}m$ CMOS high voltage process. The input voltage is up to 18V and the rectifier operates at 100kH to 205kHz, 6.78MHz frequency. The maximum efficiency is 94.8% and the maximum power transfer is 5.78W.
Keywords
wireless power transfer; WPC; A4WP; rectifier; receiver;
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