Automatic load control for highly efficient microwave rectifiers

J. Guo, Haocheng Hong, Xinen Zhu
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引用次数: 3

Abstract

This paper presents an adaptive microwave rectifier at 2.45 GHz with automatic load control to improve the conversion efficiency. The conversion efficiency of a rectifier usually changes as the input power level changes, mainly due to the diode efficiency loss associated with built-in voltage or breakdown effect. Therefore, the conversion efficiency can achieve an optimal value only at a specific input power level, and decreases when the input power deviates from this value. The proposed microwave rectifier can automatically tune the load to the optimal value at each input power to maintain a high conversion efficiency within a wide range of input power. An automatic control circuit uses a micro controller unit (MCU) to select various load resistors. By sensing the rectified DC voltage and the current load resistance, the MCU can automatically tune the load to the desired value based on a pre-loaded lookup table. When the input power changes from 5 to 70 mW, the rectifier can achieve optimal conversion efficiencies over 62.5% through automatic tuning the load from 800 to 250 Ω.
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高效微波整流器的自动负载控制
为了提高转换效率,本文提出了一种2.45 GHz自适应负载自动控制的微波整流器。整流器的转换效率通常随着输入功率的变化而变化,这主要是由于与内置电压或击穿效应相关的二极管效率损失。因此,转换效率只有在特定的输入功率水平下才能达到最优值,当输入功率偏离该值时,转换效率就会下降。所提出的微波整流器可以在每个输入功率下自动调整负载到最优值,从而在较宽的输入功率范围内保持较高的转换效率。自动控制电路使用微控制器单元(MCU)来选择各种负载电阻。通过感应整流直流电压和电流负载电阻,MCU可以根据预加载的查找表自动将负载调整到所需值。当输入功率从5 mW变化到70 mW时,整流器通过自动调节负载从800到250 Ω,可以实现超过62.5%的最佳转换效率。
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