Self-contained resonant rectifier for piezoelectric sources under variable mechanical excitation

Natan Krihely, Shmuel Ben-Yaakov

Research output: Contribution to journalArticlepeer-review

50 Scopus citations

Abstract

A rectification scheme is proposed for increasing the available output power of electrical generators that have a high output capacitance. The proposed rectifier could be useful in increasing the output power of piezoelectric generators (PZG) that convert mechanical vibrations into electrical power. The improvement is achieved by a resonant circuit that self commutates the voltage across the output terminals of the PZG and thereby eliminates the shunting of the output current by the output capacitor. A low-consumption circuit synchronously controls the operation of the resonant rectifier by detecting voltage transitions across the generator. The presented resonant rectifier was experimentally verified by connecting it to a PZG as well as to a PZG emulator. The results show that, under constant harmonic excitation, the proposed circuit can significantly increase the extracted power by up to 230% as compared to a conventional bridge rectifier. The feasibility of using the proposed topology as a self-powered system driven by variable excitation was investigated experimentally as well. In particular, the system was driven by two types of excitation source: amplitude modulated and frequency modulated. It was found that the proposed circuit increases the extracted power by 160% and 172% for AM and FM excitations, respectively.

Original languageEnglish
Article number5464259
Pages (from-to)612-621
Number of pages10
JournalIEEE Transactions on Power Electronics
Volume26
Issue number2
DOIs
StatePublished - 21 Feb 2011

Keywords

  • Harvesting
  • piezoelectric (PZ) devices
  • resonant power conversion
  • synchronous detection

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