SELF POWER SSHI CIRCUIT FOR PIEZOELECTRIC ENERGY HARVESTER

摘要

A self-power synchronized switch harvesting on inductor circuit for harvesting energy from a piezoelectric element generating an AC voltage, comprises an envelope detector having first and second capacitors connected in parallel with the piezoelectric element and functioning as negative and positive voltage detectors. An inductor is connected in parallel with the capacitors, and transistors are connected in circuit with the capacitors and inductor and are responsive to a change in voltage across the first capacitor from positive to negative to enable flow of positive voltage to the inductor until terminal voltage reaches a certain amount and current in the inductor reaches zero. A full-wave rectifier is connected to convert the AC output of the piezoelectric element to DC voltage, and a DC-DC converter is connected to adapt the power output of the rectified voltage.

主权项

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.