A two-stage power converter architecture with maximum power extraction for low-power energy sources

Authors : Ridvan UMAZ

Pages : 4744-4755

View : 16 | Download : 9

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :A two-stage power converter with maximum power extraction for energy harvesting is presented. The power converter consists of two stages; a maximum power extraction stage insert ignore into journalissuearticles values(i.e. first stage); and a regulation stage insert ignore into journalissuearticles values(i.e. second stage);. The first stage consists of a number of charge pumps connected in parallel to extract power from the energy source while the second stage steps up low input voltage level to a usable level for a load. Proposed converter operates as low as 0.3 V and the output up-converts to 3.3 V. The proposed converter is aimed to extract maximum power from either low-power energy sources or high-power energy sources without increasing the complexity of the converter. Measured results indicate that the tracking efficiency is enhanced by 117 % - 123 % over a single charge pump in the first stage converter. Proposed power converter provides 66.7 % more power extracted from the energy source than the single charge pump one. The end-to-end efficiency is enhanced by 1.67$X$ as compared to the single charge pump implementation.
Keywords : Power converter, boost converter, charge pump, energy harvesting, maximum power