Abstract
An RF–DC rectifier is an important part in a wireless power transfer system. Diode-based rectifiers are widely used in low-power harvesting scenarios, and for high power, a transistor based on the time-reversal duality was proposed. This paper presents a high-efficiency self-synchronous RF–DC rectifier based on a waveform-guided design method and an improved rectification model of a commercial GaN device. The main contributions of this paper are that (1) an improved transistor model with correct reverse bias is built for accurate rectifier simulation, and (2) a new design method of self-synchronous RF–DC rectifier is proposed: as soon as the operating mode of the rectifier, input power, and DC load are set, matching and coupling network can be calculated directly based on waveform-guided method, thus design and adjustment process of a conventional power amplifier (PA) due to the duality between a PA and a rectifier would no longer be required. A 5.8 GHz self-synchronous RF–DC rectifier is designed for validation, and the optimum RF–DC conversion efficiency is 68% with 12 W input power as well as 19.9 V output DC potential with 50 Ω load resistance. The proposed rectifier is suitable for high input power rectification applications of wireless power transfer.
Highlights
The RF–DC rectifier, which converts radio frequency (RF) power into direct current (DC) power, is the most distinguishing different component between the wireless power transfer (WPT) and wireless communication systems, which both transmit microwave power in one terminal and receive it in another side
The internal voltengineering, the first step of designing a self-synchronous RF–DC rectifier is determining age V’gs and V’ds are designed to shape the target waveform according to the steps disthe target waveforms, calculating Ids by V’gs and V’ds as variables to make an approxicussed in the previous section, and the input power and load of the rectifier were 10 W
Based on the time-reversal duality, the inverse class F waveform of a classical power amplifier (PA) was selected as target waveform to achieve high-efficiency rectifier design
Summary
The RF–DC rectifier, which converts radio frequency (RF) power into direct current (DC) power, is the most distinguishing different component between the wireless power transfer (WPT) and wireless communication systems, which both transmit microwave power in one terminal and receive it in another side. A rectifier is not needed in wireless communication systems, but it is a very important part in the receiving end of the WPT link to convert microwave power into DC power for the application. Many remarkable pieces of research have been carried out in WPT rectifiers that operate for applications of energy harvesting and sensor wireless charging [1,2].
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