Small-Area Radiofrequency-Energy-Harvesting Integrated Circuits for Powering Wireless Sensor Networks
Small-Area Radiofrequency-Energy-Harvesting Integrated Circuits for Powering Wireless Sensor Networks
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DOI：
10.3390/s19081754
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发表时间：
2019-04-02
期刊：
影响因子：
3.9
通讯作者：
Syu, Jin-Yu
中科院分区：
文献类型：
--
作者：
Sung, Guo-Ming;Chung, Chao-Kong;Syu, Jin-Yu
本研究提出了一种射频（RF）能量收集集成电路（IC），用于为无线传感器网络供电，无线发射器具有915 MHz的工业，科学和医疗（ISM）。该集成电路包括射频直流整流器、过压保护电路、低功耗低压差稳压器和充电器控制电路。在RF-DC整流电路中，使用了一个六级Dickson倍压电路，通过使用具有小阈值电压的原生MOS来将接收到的RF信号改善为DC电压。过压保护电路用于防止来自RF前端电路的高压击穿现象，特别是对于近场通信。设计了一个低功耗LDO稳压器，通过零频补偿和电压微调反馈提供稳定的电压。该充电器控制电路采用电流镜将充电电流放大N倍，实现对电池的快速稳定充电。结果表明，在输入功率为-6 dBm，输出电压为1.5 V，负载为30 k时，该集成电路的最大功率转换效率为40.56%。RF能量收集IC的芯片面积为0.58 x 0.49 mm（2），包括输入/输出焊盘，功耗为42 W。
This study presents a radiofrequency (RF)-energy-harvesting integrated circuit (IC) for powering wireless sensor networks with a wireless transmitter with an industrial, scientific, and medical (ISM) of 915 MHz. The proposed IC comprises an RF-direct current (DC) rectifier, an over-voltage protection circuit, a low-power low-dropout (LDO) voltage regulator, and a charger control circuit. In the RF-DC rectifier circuit, a six-stage Dickson voltage multiplier circuit is used to improve the received RF signal to a DC voltage by using native MOS with a small threshold voltage. The over-voltage protection circuit is used to prevent a high-voltage breakdown phenomenon from the RF front-end circuit, particularly for near-field communication. A low-power LDO regulator is designed to provide stable voltage by using zero frequency compensation and a voltage-trimming feedback. Charging current is amplified N times by using a current mirror to rapidly and stably charge a battery in the proposed charger control circuit. The obtained results revealed that the maximum power conversion efficiency of the proposed RF-energy-harvesting IC was 40.56% at an input power of -6 dBm, an output voltage of 1.5 V, and a load of 30 k. A chip area of the RF-energy-harvesting IC was 0.58 x 0.49 mm(2), including input/output pads, and power consumption was 42 W.