By Thorsten Hehn
This publication offers with the problem of exploiting ambient vibrational power which might be used to strength small and low-power digital units, e.g. instant sensor nodes. quite often, relatively for low voltage amplitudes, low-loss rectification is needed to accomplish excessive conversion potency. within the exact case of piezoelectric power harvesting, pulsed cost extraction has the capability to extract extra energy in comparison to a unmarried rectifier. For this function, an absolutely independent CMOS built-in interface circuit for piezoelectric turbines which fulfills those necessities is presented.
Due to those key homes permitting common utilization, different CMOS designers operating within the box of power harvesting can be inspired to take advantage of a number of the proven constructions for his or her personal implementations. The booklet is exclusive within the experience that it highlights the layout approach from scratch to the ultimate chip. for that reason, it supplies the dressmaker a accomplished advisor of ways to (i) setup a suitable harvester version to get lifelike simulation effects, (ii) layout the built-in circuits for low strength operation, (iii) setup a laboratory dimension surroundings with the intention to broadly represent the chip together with the true harvester and eventually, (iv) interpret the simulation/measurement leads to 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 awarded circuit concepts.
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Additional info for CMOS Circuits for Piezoelectric Energy Harvesters: Efficient Power Extraction, Interface Modeling and Loss Analysis
9, according to the IEEE Standard on Piezoelectricity , the squared coupling factor is given by 2 k31 = 2 d31 T sE η33 11 . 27) 2 exclusively depends on piezoelectric material properties. 7 . 27) can be expressed as 2 k31 = Δ2 . g. 28) where λoc and λsc denote the angular resonance frequency of the open-circuited and short-circuited structure, respectively. 1. material. According to [6, 15], realistic values of keff Due to the electromechanical feedback, two resonant frequencies exist for the piezoelectric harvester, depending on the electrical loading.
Academic Press, Waltham, 1971) 8. A. Kasyap , J. Lim, D. Johnson , S. Horowitz, T. Nishida, K. Ngo, M. Sheplak , L. Cattafesta, in Energy Reclamation from a Vibrating Piezoceramic Com- posite Beam, in Proceedings of 9th International Congress on Sound and Vibration, Orlando, FL, USA, vol 9, 8–11 July 2002, pp. 36–43 9. T. Kazmierski, in Energy Harvesting Systems: principles, Modeling and Applications. (Springer Verlag 2010) 10. N. S. Ha, A. J. Inman, Resistive impedance matching circuit for piezoelectric energy harvesting.
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