Energy Harvesting of Synchronized Switch Harvesting on Inductor

Abstract

Energy harvesting is the scavenging of energy from different energy sources. Vibration energy that is not used in our daily life can be utilized by extracting and conditioning it to a usable form by using piezoelectric material (PZT) is discussed in this paper. Piezoelectric Energy Harvester (PEH) will convert the vibration energy in to electrical energy. Different circuits are used as an interface to condition the PZT output. Full bridge energy harvester (FBEH) and Voltage doubler energy Harvester (VDEH) simulations are conducted and results confirms that the VDEH provides double the output voltage compared to FBEH. New energy harvesting scheme is also developed as the energy from PZT is not going completely to the output during each half cycle. At a small interval the output current is zero while the input voltage have to build to a voltage level make to the diodes of rectifier circuit to conduct. Hence a switched inductor is introduced at regular interval at each half cycle of voltage to flip that voltage in short period of time to reduce the power losses occurring in VDEH and FBEH. Synchronized Switched Harvesting on Inductor (SSHI) improve the output of PEH with the LC circuit developed during the circuit operation. MATLAB and MULTISIM simulations are done for all the circuits and the results are analyzed. The power loss is reduced with the SSHI scheme when compared to FBEH and VDEH. SSHI technique can be treated as a technique for extracting maximum power from PEH.