Piezoelectric Charger: Pcb Design Project Report

Topics: Direct current, Alternating current, Rectifier Pages: 9 (2263 words) Published: September 17, 2013
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PORTABLE MOBILE CHARGER USING PIEZOELECTRIC ENERGY

DEEPAK SAHADEVAN NAIR PRADEEP KARUNAMBARAN
SUBMITTED ON: 07/JUNE/2013 CIRCUIT DESIGN PROJECT REPORT 7514ENG PRACTICAL ELECTRONICS

Griffith University, Brisbane, Qld, Australia

EXECUTIVE SUMMARY
Alternative energy sources are one of the main focuses in research and development in many aspects in engineering, especially electronic devices. By targeting renewable energy sources, not only will the amount of pollution decrease but also help in preserving the rapidly depleting resources available on Earth. Compared to all the other energy sources, electrical energy conservation has the greatest potential and most opportunity. The objective of our circuit design project was to create a portable mobile device charger that will operate using vibration energy sources other than the standard charging mechanisms. As most of latest mobile phones are capable of charging from Universal Serial Bus (USB) we decided to design our circuit capable of supplying standard USB voltage and current rating. The circuit consists of a piezoelectric buzzer, a rectifier with a storage capacitor, an amplifier section, regulator and a switching mechanism that controls the energy flow into the battery. Experimental results showed that the method is feasible for practical use.

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TABLE OF CONTENTS
EXECUTIVE SUMMARY ...................................................................................................................... 1 LIST OF FIGURES .............................................................................................................................. 3 1 2 INTRODUCTION........................................................................................................................ 4 BLOCK DIAGRAM AND DESCRIPTION ............................................................................................ 5 2.1 2.2 2.3 2.4 2.5 3 4 5 6 7 PIEZOELECTRIC BUZZER ...................................................................................................... 5 RECTIFIER AND STORAGE CAPACITOR .................................................................................... 6 VOLTAGE BUFFER AND AMPLIFIER........................................................................................ 7 SWITCHING CIRCUIT .......................................................................................................... 8 VOLTAGE REGULATOR ....................................................................................................... 9

SCHEMATIC DIAGRAM............................................................................................................. 11 PCB LAYOUT ........................................................................................................................ 12 COMPONENTS USED ............................................................................................................... 12 CONCLUSION ........................................................................................................................ 13 WORKS DONE ....................................................................................................................... 14

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LIST OF FIGURES
FIGURE 1: BLOCK DIAGRAM .............................................................................................................. 5 FIGURE 2: PIEZOELECTRIC AND CONVERSE PIEZOELECTRIC EFFECT ............................................................. 6 FIGURE 3: PIEZOELECTRIC BUZZER ...................................................................................................... 6 FIGURE 4: BRIDGE RECTIFIER WITH STORAGE CAPACITOR ........................................................................ 7 FIGURE 5: VOLTAGE BUFFER ............................................................................................................. 7 FIGURE 6: NON INVERTING AMPLIFIER...
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