Converter and method for extracting maximum power from piezo vibration harvester
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United States of America Patent
Stats
-
Apr 10, 2018
Issued Date -
N/A
app pub date -
Aug 17, 2015
filing date -
Mar 19, 2010
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A system (1-2) for efficiently transferring harvested vibration energy to a battery (6) includes a piezo harvester (2) generating an AC output voltage (VP(t)) and current (IPZ(t)) and an active rectifier (3) to produce a harvested DC voltage (Vhrv) and current (Ihrv) which charge a capacitance (C0). An enable circuit (17) causes a DC-DC converter (4) to be enabled, thereby discharging the capacitance into the converter, when a comparator (A0,A1) of the rectifier which controls switches (S1-S4) thereof detects a direction reversal of the AC output current (IPZ(t)). Another comparator (13) causes the enable circuit (17) to disable the converter (4) when the DC voltage exceeds a threshold (VREF), thereby causing the capacitance be recharged.
First Claim
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Cited Art Landscape
Patent Citation Ranking
- 3 Citation Count
- H02J Class
- 22.71 % this patent is cited more than
- 7 Age
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