Journal
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Volume 62, Issue 4, Pages 986-993Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMTT.2013.2287676
Keywords
DC-DC converter; low-power rectenna; maximum power point tracking (MPPT); RF-dc conversion efficiency; RF-dc-dc circuit; wireless power transmission (WPT)
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Wireless power transmission (WPT) is actively being researched and developed. WPT transfers power to electrical load without a wire. One of the problems is that the efficiency is easily affected by load resistance and input power. Therefore, an impedance matching circuit becomes crucial for realization of high-efficiency wireless power systems. In this study, we proposed a maximum power point tracking (MPPT) method for a low-power milliwatt-level RF-dc rectifying circuit using a dc-dc converter. We proposed an RF-dc-dc circuit that consists of an RF-dc rectifier circuit and a dc-dc converter. We measured the RF-to-dc conversion efficiency of the RF-dc-dc circuit using 2.45-GHz microwave power. When the buck-boost converter is connected to the rectifying circuit, the RF-to-dc efficiency of rectifier is approximately steady at 75%, despite the load resistance changing from 100 to 5000 Omega. The overall efficiency of the RF-dc-dc circuit is still over 60%, even though the load resistance varied from 100 to 5000 Omega and the input power changed from 40 to 100 mW.
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