Projeto e análise de circuitos de coleta de energia de rádio frequência para aplicações IOT

Abstract

This work presents an overview of RF Energy Harvesting devices, pointing out the advantages and disadvantages of the main topologies used, as well as presenting the most relevant points for the design of Energy Harvesting systems. To demonstrate the operation of an Energy Harvesting system, a circuit is proposed for this purpose that makes use of an RF antenna, an impedance matching network with a resonant circuit for raising the input voltage and a modified gate cross-coupled charge pump rectifier (CC-CPR). The proposed circuit uses ten stages of CC-CPR to providing an output voltage equal to 1.2 V when powered with -26 dBm. Ways to define design parameters for EH are demonstrated, such as output voltage, number stages of rectification, alternative topologies, and how to find the optimal working point of the circuit through simulations. The integrated circuit was developed in CMOS TSMC 180nm technology and has a maximum power conversion efficiency (PCE) of 28.41%.