Self-powered micro-watt level piezoelectric energy harvesting system with wide input voltage range

Abstract

This paper presents a micro-watt level energy harvesting system for piezoelectric transducers with a wide input voltage range. Many such applications utilizing vibration energy harvesting have a widely varying input voltage and need an interface that can accommodate both low and high input voltages in order to harvest as much energy as possible. The proposed system consists of two rectifiers, both implemented as negative voltage converters followed by active-diodes, and three switched-capacitor DC-DC converters to either step-up or step-down and regulate to the target voltage. The system has been implemented in a 0.18 lm CMOS process and the chip measures 3 mm 2 . Measurements show a low voltage drop across the rectifiers and high peak power efficiency of the DC-DC converters (68.7-82.2%) with an input voltage range of 0.45-5.5 V for the complete system. Used standalone, the DC-DC converters support input voltages between 0.5 and 11 V while maintaining an output voltage of 1.8 V at an output power of 16.2 lW. The ratio of each converter is selectable to be either 1:2, 1:3, or 1:4.

WITHDRAWN: Production of Intensifying Blue Light by Cherenkov Radiation Phenomena and Their Use as Power Source Applications

“…If used small activity for the radioactive source 90 Sr( 90 Y), A=1 mCi, then the output power was found 1.45 nwatt. Applications for output micro/nano-watt power source are nuclear batteries [20], [23], [24], [25] , medical instrumentation systems, scientific and engineering instruments, and also radio and radar receivers [26], [27], [28] .…”

Performance assessment of an energy harvesting system located on a copter

“…From prior literature during the last two decades, the piezoelectric material have long been used as sensors or actuators [6]. Although the mechanical vibration takes place in most of the structures, the possible harvested performance of the piezoelectric is not high and the energy level is low in micro-or milli-watt orders [7]. However, with some improvement on the piezoelectric materials and their fabrication process, as well as low energy consumption of the electronic circuit design makes a possibility of using piezoelectric elements in a wider range of applications.…”