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1. (WO2017149289) ENERGY HARVESTING SYSTEMS AND METHODS

Pub. No.:    WO/2017/149289    International Application No.:    PCT/GB2017/050534
Publication Date: Sat Sep 09 01:59:59 CEST 2017 International Filing Date: Wed Mar 01 00:59:59 CET 2017
IPC: H02J 7/00
H02N 2/18
Applicants: CAMBRIDGE ENTERPRISE LIMITED .
Inventors: SESHIA, Ashwin
DU, Sijun
JIA, Yu
Title: ENERGY HARVESTING SYSTEMS AND METHODS
Abstract:
We describe a method of energy harvesting from an electromechanical device providing alternating current (AC) electrical power via a rectifier. The method comprises: identifying when a current flow from the device is substantially zero and, responsive to this identifying: connecting and disconnecting a first charge storage capacitor in parallel with the device with a first sense, such that charge on the device is shared with the first charge storage capacitor, to collect charge from the device on the first charge storage capacitor; preferably clearing the remaining charge on the electromechanical device; and then connecting and disconnecting the first charge storage capacitor in parallel with the device in a second, opposite sense to the first sense, such that the collected charge on the first charge storage capacitor is shared with opposite polarity with the device, to replace opposite polarity charge from the first charge storage capacitor onto the device.