Capacitive DC-DC Converter with Extending High Efficiency Range for Soil Microbial Energy Extraction
| Autor: | Liu, Chia-Hung, 劉家宏 |
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| Rok vydání: | 2019 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 107 In recent years, climate changing and awareness of environmental protection have led the development of green economy. Many new technologies have been applied to reduce CO2 emissions and transform CO2 into useful organic or inorganic carbon sources in our environment. Soil battery uses soil as an important medium for microbial nutrient replenishment. If soil battery can combine with microbes, it will be conducive to develop green energy systems achieving environmental and energy development. Therefore, this article will focus on exploring the photosynthetic microbial soil energy. To achieve sustainable agricultural and energy development, this study will make use of the function of photosynthetic microbes to capture carbon. However, microbial soil batteries suffer from the following problems, the difference of soil, variation number colonies of bacteria, and electrode aging. To design a dedicated voltage converter, it is necessary to add a mechanism for energy judgment in order to selecting the most appropriate input to expand high efficiency range. Nevertheless, smart energy delivery and storage is necessary for the changing of the battery sources. Due to the large power consumption of the environmental sensors and wireless transceivers, the soil energy is not sufficient to supply the entire wireless sensing system. The proposed upper and lower regulation controller controls the power switch between output of the dc-cd converter and load for a large sudden load current (>20mA) and regulates the output voltage between 1.7 and 1.8V. Using the charging and discharging conditions of the reference capacitance balance the input and output power requirement, further increasing high efficiency for a wide load range. The proposed capacitive DC-DC converter with maximum power point tracking for soil energy extraction is fabricated in a 0.18μm CMOS process. The goal is to propose a capacitive DC-DC converter with dynamically adjusting input source, to expand a wide range of high efficiency over the wide load range, and also build an energy storage mechanism to store and utilize excess energy. The design achieves a tracking efficiency of 87.1% in the output power range from 160 µW to 2.5mW and the peak system efficiency of 86.6%. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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