A Self-Powered Hybrid Energy Scavenging System Utilizing RF and Vibration Based Electromagnetic Harvesters

[摘要] This study presents a novel hybrid system that combines the power generated simultaneously by a vibration-based Electromagnetic (EM) harvester and a UHF band RF harvester. The novel hybrid scavenger interface uses a power management circuit in 180 nm CMOS technology to step-up and to regulate the combined output. At the first stage of the system, the RF harvester generates positive DC output with a 7-stage threshold compensated rectifier, while the EM harvester generates negative DC output with a self-powered AC/DC negative doubler circuit. At the second stage, the generated voltages are serially added, stepped-up with an on-chip charge pump circuit, and regulated to a typical battery voltage of 3 V. Test results indicate that the hybrid operation enables generation of 9 μW at 3 V output for a wide range of input stimulations, which could not be attained with either harvesting mode by itself. Moreover the hybrid system behaves as a typical battery, and keeps the output voltage stable at 3 V up to 18 μW of output power. The presented system is the first battery-like harvester to our knowledge that generates energy from two independent sources and regulates the output to a stable DC voltage.

[发布机构] METU, Department of Electrical and Electronics Engineering, Ankara, Turkey^1;METU-MEMS Research and Applications Center, Ankara, Turkey^2;METU Northern Cyprus Campus, Department of Electrical and Electronics Engineering, Güzelyurt, Mersin; 10, Cyprus^3

[效力级别] 能源学

[关键词] Battery voltages;CMOS technology;Electromagnetic harvesters;Hybrid energy;Hybrid operations;Independent sources;Output voltages;Power management circuits