By Thorsten Hehn
This ebook offers with the problem of exploiting ambient vibrational strength which might be used to energy small and low-power digital units, e.g. instant sensor nodes. as a rule, quite for low voltage amplitudes, low-loss rectification is needed to accomplish excessive conversion potency. within the targeted case of piezoelectric strength harvesting, pulsed cost extraction has the capability to extract extra strength in comparison to a unmarried rectifier. For this function, an absolutely self reliant CMOS built-in interface circuit for piezoelectric turbines which fulfills those specifications is presented.
Due to those key homes allowing common utilization, different CMOS designers operating within the box of power harvesting may be inspired to take advantage of a few of the proven constructions for his or her personal implementations. The ebook is exclusive within the experience that it highlights the layout technique from scratch to the ultimate chip. for this reason, it provides the dressmaker a complete advisor of ways to (i) setup a suitable harvester version to get practical simulation effects, (ii) layout the built-in circuits for low strength operation, (iii) setup a laboratory dimension atmosphere for you to generally signify the chip together with the genuine harvester and eventually, (iv) interpret the simulation/measurement ends up in order to enhance the chip functionality. because the dimensions of all units (transistors, resistors etc.) are given, readers and different designers can simply re-use the provided circuit concepts.
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Extra info for CMOS Circuits for Piezoelectric Energy Harvesters: Efficient Power Extraction, Interface Modeling and Loss Analysis
Welsh III, IEEE Standard on Piezoelectricity. Institute of Electrical and Elec- tronics Engineers (IEEE), New York (1988) 14. D. C. M. S. Holmes, Architectures for vibration-driven micropower generators. J Microelectromech Syst 13(3), 429–440 (2004) 15. M. Renaud, T. Sterken, A. Schmitz, P. Fiorini, C. Van Hoof, R. Puers, in Piezoelectric Harvesters and MEMS Technology: Fabrication, Modeling and Measurements, in Proceedings of the International Conference on Solid- State Sensors, Actuators and Microsystems (Transducers), Lyon, France, 10–14 June 2007, pp.
In most cases, it is sufficient to set its current amplitude such that a desired piezoelectric voltage is generated. 32). The piezoelectric capacitance should have a somehow realistic value since it determines how much energy can be extracted from the harvester during one transfer cycle. After the successful chip design and fabrication, it may be interesting to know how the chip performs connected to different piezoelectric harvesters, especially in terms of the power that can be extracted. For that reason, it is important to have an accurate model that behaves similar to a real piezoelectric harvester.
Wardle, Experimental verification of models for microfabricated piezoelectric vibration energy harvesters. AIAA J. 45(5), 1126–1137 (2007) 5. G. Gautschi, in Piezoelectric Sensorics: Force, Strain, Pressure, Accelera- tion and Acoustic Emission Sensors, Materials and Amplifiers (Springer Verlag, 2002) 6. D. Guyomar, A. Badel, E. Lefeuvre, C. Richard, Toward energy harvest- ing using active materials and conversion improvement by nonlinear process- ing. IEEE Trans. , Ferroelectrics Freq. Control 52(4), 584–595 (2005) 7.
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