By Thorsten Hehn
This e-book bargains with the problem of exploiting ambient vibrational strength which are used to energy small and low-power digital units, e.g. instant sensor nodes. normally, really for low voltage amplitudes, low-loss rectification is needed to accomplish excessive conversion potency. within the designated case of piezoelectric strength harvesting, pulsed cost extraction has the aptitude to extract extra strength in comparison to a unmarried rectifier. For this objective, a completely self reliant CMOS built-in interface circuit for piezoelectric turbines which fulfills those requisites is presented.
Due to those key homes allowing common utilization, different CMOS designers operating within the box of strength harvesting may be inspired to exploit the various proven buildings for his or her personal implementations. The ebook is exclusive within the feel that it highlights the layout approach from scratch to the ultimate chip. accordingly, it offers the dressmaker a complete advisor of the way 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 size surroundings as a way to largely signify the chip together with the true harvester and at last, (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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Extra resources for CMOS Circuits for Piezoelectric Energy Harvesters: Efficient Power Extraction, Interface Modeling and Loss Analysis
Thus, the coupled electrical equivalent circuit composed of lumped elements, as shown in Fig. 11, can be derived [10, 16]. The electrical domain is a representation of the second equation of Fig. 33, so the value of the capacitor can be directly defined as C P . An additional parallel resistor modelling the leakage losses is omitted since its resistance is usually very high (>10 M ). A little more effort has to be made in order to determine the lumped element parameters of the electrical domain.
20) shows that the force F is composed of the “spring” force k P η which depends on the material stiffness and the coupling force Δ V P which depends on the voltage across the piezoelectric material. Due to the balance of forces, F can be considered as the restoring force Fe acting on the seismic mass, as defined in Fig. 6. Usually, piezoelectric materials are very stiff, so very high resonant frequencies would result if the piezo beam would be suspended directly within the harvester frame. Thus, the cantilever configuration shown in Fig.
Najafi, A Vibration Harvesting System for Bridge Health Monitoring Applications, in Proceedings of the International Workshop on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS), Leuven, Belgium, 30 Nov–3 Dec 2010, pp. 179–182 15. F. Goldschmidtboeing, P. Woias, Characterization of different beam shapes for piezoelectric energy harvesting. J. Micromech. Microeng. 18(104), 013 (2008) 16. D. Guyomar, G. Sebald, S. Pruvost, M. Lallart, A. Khodayarii, C. Richard, Energy harvesting from ambient vibrations and heat.
CMOS Circuits for Piezoelectric Energy Harvesters: Efficient Power Extraction, Interface Modeling and Loss Analysis by Thorsten Hehn