Literature review about piezoelectric electronic circuit Research Paper

Literature study about piezoelectric electronic circuit (Rectification with an inductor and Buck DC-DC converter cuircuit) - Research Paper congressman(Diamond, 2009) Much of its role in alternative energy and applications but first, what is piezoelectricity or, the piezoelectric effect? Wayne Tomasi (2004) defines the piezoelectric effect as generating electrical oscillations as varying mechanical stresseseither as, compression, tension, torsion or shearing, is employ across a crystal lattice structure (i.e. quartz, Rochelle salts, tourmaline, etc.) and vice versa. With this, ambient vibrations in and around systems which typicall(a)y, atomic number 18 lost energy, can be captured and converted to usable energy, available for consumptionthe primary goal of role harvesting but since, as shown in research, the energy generated by piezoelectricity is insufficient to power just about electronics, power harvesting technology has, mostly, focused on accumulation and storage techniqu es that would enable technology to pick up enough energy for a variety of applications. (Sodano et al., 2005) In this premise, the researcher came up with a project, entitled unified Circuits for Energy Harvesting Application, aiming to design and build a prototype circuit that utilizes piezoelectricityvia the PFCB-W14 piezoelectric device, for energizing small electronic systems, which in this case, is the charging of a Lithium-ion rechargeable onslaughtwhich have become actually popular today. Figure 1. Equivalent Circuit and Power Generation of PFCB-W14 at 27Hz To better visualize the impression of piezoelectricity, illustrated above is an equivalent circuit of a piezoelectric generatorfunctioning as a capacitance and a resistor in series with the output terminals, as well as a close off chart of the power generation of Advanced Ceramics Incorporated PFCB-W14 at 27Hz, both obtained from PFCB-W14 Specifications Sheet. By closely flavor into the chart, it can be seen that w ith load resistance in the range of 400k? to 600k?, at typical amounts of force applied, thither is maximum power. And along the lines of impedance-matching, when the load and source impedancesin this case, the load and internal resistances, were equal, maximum power polish off occurs, an important point to consider in every circuit design. (Boylestad & Nashelsky, 1998) Also, note that the output of the generator is an ac voltage. Disregarding impedance-matching, rectifying the piezoelectric generator, and directly connecting the output to a capacitor or battery would have been a more straightforward approach for the project. Despite its simplicity and the fact that this circuit works, with the enormous mismatch in the midst of the resistances of the generator (in the order of millions) and the battery (merely in ohms, and at times even down to milliohms), basically all the power would be dissipated as heat in the generator itself. For a better execution of instrument of the proj ect, the circuit shown below was considered. Figure 2. Simple Charging Circuit using Inductor Illustrated above is a undecomposable charging circuit that utilizes an inductor, on top of piezoelectric generator, a rectifier bridge, a Zener diode and a Lithium battery that is being charged. Inductor Adding an inductor, as shown above, with sufficiently high reactance so as for the piezoelectric