A Constant Efficiency of Rectifying Circuit in an Extremely Wide Load Range
A Constant Efficiency of Rectifying Circuit in an Extremely Wide Load Range
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DOI：
10.1109/tmtt.2013.2287676
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发表时间：
2014-04-01
影响因子：
4.3
通讯作者：
Mitani, Tomohiko
中科院分区：
文献类型：
--
作者：
Huang, Yong;Shinohara, Naoki;Mitani, Tomohiko
无线电力传输（WPT）正在积极研究和开发。 WPT 无需电线即可将电力传输至电力负载。问题之一是效率容易受到负载电阻和输入功率的影响。因此，阻抗匹配电路对于实现高效无线电力系统至关重要。在本研究中，我们提出了一种使用 DC-DC 转换器的低功率毫瓦级 RF-dc 整流电路的最大功率点跟踪 (MPPT) 方法。我们提出了一种 RF-dc-dc 电路，由 RF-dc 整流器电路和 dc-dc 转换器组成。我们使用 2.45 GHz 微波功率测量了 RF-dc-dc 电路的 RF-dc 转换效率。当降压-升压转换器连接到整流电路时，尽管负载电阻从 100 欧姆变化到 5000 欧姆，整流器的射频转直流效率大约稳定在 75%。即使负载电阻从 100 欧姆变化到 5000 欧姆、输入功率从 40 变化到 100 毫瓦，RF-dc-dc 电路的整体效率仍然超过 60%。
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.