Title :
Improve the efficiency-load characteristic of rectifying circuit using a self-powered DC-DC converter
Author :
Yong Huang ; Shinohara, Nobuhiro ; Mitani, Tomonori
Author_Institution :
Res. Inst. for Sustainable Humanosphere, Kyoto Univ., Uji, Japan
Abstract :
We know that the RF-DC conversion efficiency of rectenna is strictly affected by the load and the input power. This study proposes a RF-DC-DC circuit, consisting of a rectifying circuit and a DC-DC converter, to improve the efficiency-load characteristic of rectenna. The proposed DC-DC converter can work with constant input impedance independent of the load resistance. Especially, the control part of DC-DC converter is self-powered rather than additional DC power source. We measured the designed RF-DC-DC circuit with a 2.45 GHz microwave power of 80 mW. The conversion efficiency of the rectifying circuit alone is constant over 80% in the load range from 200 Ω to 5000 Ω, when it is connected with the DC-DC converter. Furthermore, the overall efficiency of the RF-DC-DC circuit is almost constant over 66% in this wide load range.
Keywords :
DC-DC power convertors; rectennas; rectifiers; RF-DC conversion efficiency; RF-DC-DC circuit; efficiency-load characteristic improvement; frequency 2.45 GHz; load resistance; power 80 mW; rectenna; rectifying circuit; self-powered DC-DC converter; Impedance; MOSFET; Microwave circuits; Rectennas; Rectifying circuits; Resistance; RF-DC conversion efficiency; RF-DC-DC circuit; rectifying circuit; self-powered DC-DC converter;
Conference_Titel :
Wireless Power Transfer Conference (WPTC), 2014 IEEE
Conference_Location :
Jeju
DOI :
10.1109/WPT.2014.6839581