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SELF POWER SSHI CIRCUIT FOR PIEZOELECTRIC ENERGY HARVESTER

  • US 20150311824A1
  • Filed: 04/24/2014
  • Published: 10/29/2015
  • Est. Priority Date: 04/24/2014
  • Status: Active Grant
First Claim
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1. A self-power synchronized switch harvesting on inductor circuit for harvesting energy from a piezoelectric element generating an AC voltage, comprising:

  • an envelope detector comprising first and second capacitors connected in parallel with said piezoelectric element, said capacitors functioning as negative and positive voltage detectors;

    an inductor connected in parallel with said capacitors;

    switch means connected in circuit with said inductor, said switch means being responsive to a change in voltage across said first capacitor from positive to negative to enable flow of positive voltage to and through said inductor until terminal voltage reaches a certain amount and current in the inductor reaches zero; and

    a full-wave rectifier connected in said circuit to convert the AC output of said piezoelectric element to DC voltage.

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