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A fully integrated autonomous power management system with high power capacity and novel MPPT for thermoelectric energy harvesters in IoT/wearable applications
Tabrizi, Hamed Osouli; Jayaweera, H. M. P. C.; Muhtaroglu, Ali;( Abstracts: This paper reports a fully integrated autonomous power management system for thermoelectric energy harvesting with application in batteryless IoT/Wearable devices. The novel maximum power point tracking (MPPT) algorithm does not require open circuit voltage measurement. The proposed system delivers 0.5 mA current with 1 V regulated output based on simulations, which is the highest output current for a fully integrated converter reported in the literature for ultra-low voltage applications, to the best knowledge of the authors. Regulated 1 V output can be achieved for load range >2 k Omega, and input voltage range >140 mV. The circuit has been implemented in UMC-180nm standard CMOS technology and simulated.; 2017-11-17)
This paper reports a fully integrated autonomous power management system for thermoelectric energy harvesting with application in batteryless IoT/Wearable devices. The novel maximum power point tracking (MPPT) algorithm do...
Piezoelectric torsional actuation in d(36) shear-mode PMN-PT single crystals
Berik, Pelin; Chang, Wei-Yi; Jiang, Xiaoning;( Abstracts: This paper presents an experimental and numerical characterization of a piezoelectric d(36) shear-based torsion actuator made of xPb(Mg1/3Nb2/3)O-3-(1-x)PbTiO3 (PMN-PT) single crystals embedded between Polydimethylsiloxane (PDMS) layers. The generated rate of twist value of the piezoelectric d(36)-mode PMN-PT single crystal composite torsion actuator was obtained using a laser vibrometer from the maximum detected transverse deflection measurement. The quasi-static torsion actuation experiments were conducted on the piezoelectric d(36) torsion actuator by applying different AC voltages at 1 Hz. The experimental benchmark was further modelled by Finite Element (FE) code ABAQUS (R) using three dimensional (3D) piezoelectric finite elements. The experimental results and Finite Element computations showed good agreement. Findings reveal that more rate of twist is produced by PMN-PT single crystals in comparison to piezoceramic alternatives. This piezoelectric PMN-PT d(36)-mode composite torsion actuator can be effectively used in torsional deformation control.; 2018-03-08)
This paper presents an experimental and numerical characterization of a piezoelectric d(36) shear-based torsion actuator made of xPb(Mg1/3Nb2/3)O-3-(1-x)PbTiO3 (PMN-PT) single crystals embedded between Polydimethylsiloxane...