piezoelectric mobile charger circuit mini project pdf
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piezoelectric mobile charger circuit mini project pdf

Description: When a piezoceramic trandsucer is stressed mechanically by a force, its electrodes receive a charge that tends to counteract the imposed strain. This charge may be collected, stored and delivered to power electrical circuits or processors.

The Piezo Bending Generator

When the Energy Harvesting Bender is flexed, one layer is compressed while the other is stretched, resulting in power generation. It may be excited by intermittent pulses or continuously from low frequency to resonant frequency (where rated displacement is achieved at the lowest force level). The Energy Harvesting Bender is a pre-mounted and pre-wired Double Quick-Mount Bending Generator designed to attach easily to sources of mechanical strain. Its double ended design lends itself to being mounted either as a cantilever or a simple beam. Dimensions for the standard -503 size Double Quick-Mounts are shown below.

Piezo Energy Harvesting Circuit

The self powered Piezo Energy Harvesting Circuit collects intermittent or continuous energy input from the piezo generator and efficiently stores their associated energy in an on-board capacitor bank. During the charging process, the capacitor voltage is continuously monitored. When it reaches 5.2V the module output is enabled to supply power to an external (user) load. At this point 55 mJ of energy are available. When generator energy input is high, the output voltage remains ON continuously. Capacitor voltage is clamped at 6.8V. If external power demand exceeds generation, the output voltage decreases. When the output voltage drops to 3.1V, power to the load is switched OFF and is not turned on again until the capacitor bank has been recharged to 5.2V. The circuit accepts input voltages from 0V to ±500V AC or DC and input currents to 400 mA.

Piezo Energy Harvesting Kit

The Energy Harvesting Kit consists of one Double Quick-Mount Harvesting Bender and one Energy Harvesting Circuit.
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#3

Abstract

When a person walks, pressure is exerted on the ground and this pressure can be converted into electrical energy and it can be used to power electronic devices. In this paper a Mobile charging system is designed. A piezo electric generator is placed in the shoe. The power that is generated by piezo electric generator when a person walks is transferred to the device by using a mid-range wireless power transfer (WPT) which is a Resonance coupling technique.Piezoelectric elements put out very small amounts of charge and you would need a really high cycle rate to get useful current.
Static pressure does no work.
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