Designing a low voltage energy harvesting circuits for rectified storage voltage using vibrating piezoelectric

This paper presents a designing of a low voltage energy harvesting circuits for generating rectified voltage into storage devices using vibrating piezoelectric element. A technique (i.e., DC-DC Step-Down converter) has chosen for designing the low-power circuit with low voltage energy. The proposed method consumes very little power, and is especially suitable for the environments, where ambient harvested power is very low. The energy harvesting circuit consists of diode bridge ac-dc rectifier and an energy storage device with an output capacitor, an electrochemical battery, and a switch-mode dc-dc converter that control the energy flow into the battery. This paper will study results these important issues regarding the efficiencies of the energy harvesting circuits considering the storage device low voltage. For the piezoelectric element model with ac-dc rectifier, storage device and load verified by PSPICE simulation. The results show piezoelectric element model with ac-dc rectifier of 180mV, and load higher efficiency of 85%. Finally, dc-dc (Step-down) converter generates 20mV.