Circuito de condicionamento de energia aplicado a sistemas de colheita de energia por radiofrequência.

Abstract

The microelectronic technology advancements have been making possible the reduction of power consumption allowing the development of energy harvesting systems to low-power electronic devices. In this context, low-power conditioning circuits have been needed to regulate and manage the output voltage levels from an energy harvester in order to power those devices correctly. In this work, it is proposed a high-efficiency power conditioning circuit applied to Radio-Frequency energy harvester capable to carry out adequate power conditioning to supply regulated output voltage to an electronic device. In this way, a full-wave CMOS rectifier, a DC/DC converter, an oscillator circuit and a voltage regulator were developed where a novel topology of the rectifier circuit based on a bulk-biasing control circuit that reduces leakage currents through its transistors was proposed and, as a result, it shows to be possible to achieve 6% more efficiency as compared to the best results of rectifiers described in the scientific literature. The capacitive inductive hybrid DC/DC converter is clocked by the oscillator circuit powered by the power conditioning circuit itself. In fact, the whole proposed power conditioning circuit does not require any external power supply for its operation, unlike some ones described in recent published papers. The power conditioning circuit was designed using the Virtuoso/Cadence software and was shipped for manufacturing with a 130 nm CMOS technology. The proposed conditioning circuit is capable of supplying -19,09 dBm, with 14.5% of efficiency and 3.3 V of output voltage, when the received power and input voltage are -10.7 dBm and 600 mV, respectively. In addition, the experimental and simulation results were compared with other studies.