Design and implementation of piezoelectric energy harvesting circuit

Purpose This paper presents the design of a piezoelectric vibration energy generator with power conditioning circuit to power wireless sensor node. Frequency and voltage characterization of piezoelectric energy harvester is performed. A single stage AC-DC power converter which integrates the rectification and boosting circuit is designed,simulated and implemented in hardware. Design/methodology/approach The designed power conditioning circuit incorporates bridgeless boost rectification, Lithium ion battery as energy storage unit and voltage regulation in order to extract maximum power from PZT-5H and to attain higher efficiency. Sensor node is modelled in active and sleep state based on the power consumption. Dynamic modelling of the Lithium ion battery with its state of charging and discharging is analysed. Findings The test result shows that the energy harvester produces a maximum power of 65.9 mW at the resonant frequency of 21.4 Hz. The designed circuit will operate even at a minimum input voltage of ...