Power transfer of piezoelectric generated energy
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United States of America Patent
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Dec 30, 1997
Grant Date -
N/A
app pub date -
Oct 23, 1995
filing date -
Oct 23, 1995
priority date (Note) -
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Abstract
The electric energy generated by a piezoelectric device (PEG), when mechanically stressed, is transferred from the PEG to a storage element (e.g., a capacitor or a battery) by selectively coupling an inductor in the conduction path between the PEG and the storage element. In one embodiment, the transfer of energy is optimized by allowing the amplitude of the electric signal to reach a peak value before transferring the electrical energy via an inductive network to a capacitor or a battery for storage. Electrically, the PEG is operated without a significant loading (e.g., essentially open circuited) when the amplitude of the voltage generated by the PEG is increasing. When the amplitude of the voltage has peaked, or reached a predetermined value, the electrical energy generated by the PEG is coupled to an inductive-capacitive network for absorbing and storing the energy produced by the PEG.
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