Efficient Energy Transfer for Wireless Devices

Abstract: This project is intended to findsuitable circuit architecture forefficient power transmission where thepower supply is low.Two circuits will be built. The firstwill receive high AC which correspondsto the voltage created in a piezoelement once subjected to stress fromfoot steps It will deliver 3.3DC.The second circuit will receive low ACwhich will represent voltage receivedfrom a wireless transfer.Due to a failing high voltage powersupply the second circuit was never putto practice. The idea was to send a wavefile through an OP-amplifier to simulatethe voltage from the piezo element. Thevoltage was then rectified and convertedto 3.3DC.Circuit 2 was tested with a frequencygenerator as power supply. The voltagewas transformed, rectified and at lastconverted to 3.3DC through a voltageregulator. Due to lack of deliveredpower from the frequency generator itwas necessary to duty cycle the load tolimit the power dissipation.The power dissipation in the voltageregulator was limited as well byswitching it on and off. When switchedoff a capacitor was charged. When in onmode the capacitor was emptied into thevoltage regulator.