Study of PEH Configurations & Circuitary and Techniques for Improving PEH Efficiency

The term "energy harvesting" refers to the generation of energy from sources such as ambient temperature, vibration or air flow. Converting the available energy from the environment allows a self-sufficient energy supply for small electric loads such as sensors or radio transmitters. Kinetic energy can be converted into electrical energy by means of the piezoelectric effect: Piezo elements convert the kinetic energy from vibrations or shocks into electrical energy. Using suitable electronics, this effect can be used for creating a self-sufficient energy supply system. This is of particular interest whenever a power supply via cable is not possible and the use of batteries and the associated maintenance expenditure are not desired. On that point are numerous agents on which amount of energy that can be gleaned from a vibrating system depends. The condition of the piezo - patch, position of the piezo - patch, magnitude of applied load, type of material used, model configuration, circuitry used etc. are some important elements that must be considered during energy harvesting. In this paper, we have reviewed the vibrational energy harvesting from different model configurations and also we have brushed up some papers in order to examine the various techniques through which efficiency of a piezoelectric energy harvester can be bettered.