A New Efficient Power Management Interface for Hybrid Electromagnetic-Piezoelectric Energy Harvesting System
Harvesting high output power from ambient vibration energy using a hybrid piezoelectric and electromagnetic equivalent circuit is a verified technique. This paper introduces a novel interface circuit for the hybrid system, which has high efficiency and output power. The proposed interface uses a parallel-synchronized switch in the standard AC-DC converter for the piezoelectric energy harvester part, which can greatly improve the output power and efficiency. Moreover, a DC-DC boost converter is used to enhance the extracted energy from the electromagnetic energy harvesting section due to its low output power. The defined interface model implemented on a typical hybrid piezoelectric-electromagnetic system and the simulation results confirm the enhancement of output power to 250 mW along with the efficiency of 80%. The efficiency of the proposed hybrid harvester enhanced 47.36% and 92% in comparison to the standard hybrid and piezoelectric system respectively. The effectiveness of the hybrid circuit confirmed while its extracted power is 50 mW more than the single piezoelectric system with the switch interface.
KeywordsFull bridge rectifier A DC-DC boost interface Vibration energy The controlled electromechanical interface
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