Efficient direct ac-to-dc converters for vibration-based low voltage energy harvesting

Suman Dwari*, Rohan Dayal, Leila Parsa, Khaled Nabil Salama

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

32 Scopus citations


In this paper two direct ac-to-dc power electronics converter topologies are proposed for efficient and optimum energy harvesting from low voltage microgenerators. The conventional power electronics converters used for such applications have two stages, a diode bridge rectifier at the front end followed by a dc-dc boost converter. However, the extremely low ouput voltage of electromagnetic microgenerators does not allow diode bridge rectification. Even if possible, the losses in the front end diode bridge make the conventional power electronic interfaces quite inefficient. The proposed single stage converters directly boost the microgenerator low ac voltage to usable dc voltage level, and hence, achieve higher efficiency. The single stage ac-to-dc power conversion is achieved by utilizing the bidirectional current conduction capability of MOSFETs. Moreover, for optimum energy harvesting the power converter should be able to control the load resistance as seen by a microgenerator. The conventional converters are not conducive for such control. With the proposed converter topologies the optimal energy harvesting can be successfully realized.

Original languageEnglish (US)
Title of host publicationProceedings - 34th Annual Conference of the IEEE Industrial Electronics Society, IECON 2008
PublisherIEEE Computer Society
Number of pages6
ISBN (Print)9781424417667
StatePublished - 2008
Externally publishedYes

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


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