Voltage Multiplier Rectifier with Second Harmonic Resonance for Wireless Power Transfer System

Juwan Kim, Wonshil Kang, H. Ku
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Abstract

A coupling coefficient $k$ decreases as the size of the receiver coil decreases, when RF power is transmitted to small size devices such as implantable medical devices by magnetic resonant method. In this case, the rectifier efficiency using conventional voltage multiplier (CVM) is very low. The turn-on time of rectifying diode becomes unstable, when a low input voltage is applied to CVM, and power conversion efficiency (PCE) is reduced. In order to overcome this problem, we present novel voltage multiplier with second harmonic resonance (SRVM). Using the resonance of the second harmonic of operation frequency, the proposed SRVM overcomes the threshold voltage of diode with the induced voltage of the LC tank and achieves high PCE in the case of low coupling coefficient. When $k$ is 0.01~0.05, the maximum PCE of SRVM is 77.5%, which is more than 51 % higher than CVM.
无线电力传输系统的二次谐振倍压整流器
当射频功率通过磁谐振方式传输到小尺寸设备(如植入式医疗设备)时,耦合系数$k$随着接收线圈尺寸的减小而减小。在这种情况下,使用传统电压乘法器(CVM)的整流器效率非常低。当CVM输入电压过低时,整流二极管导通时间不稳定,功率转换效率(PCE)降低。为了克服这个问题,我们提出了一种新型的二次谐波谐振电压倍增器(SRVM)。利用工作频率的二次谐波共振,利用LC槽的感应电压克服了二极管的阈值电压,在低耦合系数的情况下实现了高PCE。当$k$为0.01~0.05时,SRVM的最大PCE为77.5%,比CVM高51%以上。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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