High efficiency power converter for energy harvesting devices
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United States of America Patent
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Issued Date -
Oct 26, 2006
app pub date -
Apr 20, 2005
filing date -
Apr 20, 2005
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Abstract
A high-efficiency power converter converts the unregulated AC electrical energy generated by an energy harvesting device to regulated quasi-continuous DC or AC power delivered to a load. A DC link capacitor stores energy from the AC input. Control electronics alternately transfers regulated power to the load and recharges the capacitor in accordance with a hysteresis window in the capacitor energy. The control electronics terminates transfer of regulated power to the load and initiates recharging of the capacitor when the capacitor voltage, hence energy falls below a lower threshold and terminates capacitor charging and initiates power transfer when the capacitor voltage, hence energy exceeds an upper threshold.
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