چكيده به لاتين
Energy harvesting is a process in which environmental energies that may be disappeared are collected and converted into electrical energy for low power devices. This process is now used by many devices, such as medical implants, which provide its energy from the movement of heart.
The electrostatic energy harvester is based on variable capacitors. In energy harvesters, the amount of stored energy changes as the capacitance changes, so modeling the capacitance between the two metal plates in a generator plays a key role to the design, performance analysis, and structure optimization of these generators. In constant voltage generators, periodic groove electrode structure is used. In this thesis, first, the new obtained formula for modeling the capacitor is presented, and the optimization of its structure and dimensions is done according to this formula.
The obtained formula for modeling the capacitors for the periodic groove electrode structure is very accurate and is obtained for the three-dimensional structure as well as considering the effect of the number of electrodes and can be used to optimize the desired structure. In order to optimize the system and increase the amount of harvested energy and also to have an efficient system, it is necessary to model and calculate the capacitors accurately. In this thesis, we validated the proposed formula using COMSOL and MATLAB softwares and finally optimized the dimensions of structure accordingly. The optimization is based on the amount of output power and energy. Finally, using the proposed optimization approach, a 23% increase in output power compared to the cases reported in the past papers was obtained.
