Analysis of Sliding-Mode Controlled Impedance Matching Circuits for Inductive Harvesting Devices

Juan A. Garriga-Castillo, Hugo Valderrama-Blavi, José A. Barrado-Rodrigo and Àngel Cid-Pastor
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Juan A. Garriga-Castillo: Department of Informatics and Industrial Engineering, Universitat de Lleida, c/Jaume II, 69.25001 Lleida, Spain
Hugo Valderrama-Blavi: Laboratory GAEI, ETSE-Universitat Rovira i Virgili, Av. Països Catalans 26, 43007 Tarragona, Spain
José A. Barrado-Rodrigo: Laboratory GAEI, ETSE-Universitat Rovira i Virgili, Av. Països Catalans 26, 43007 Tarragona, Spain
Àngel Cid-Pastor: Laboratory GAEI, ETSE-Universitat Rovira i Virgili, Av. Països Catalans 26, 43007 Tarragona, Spain

Energies, 2019, vol. 12, issue 20, 1-24

Abstract: A sea-wave energy harvesting, articulated device is presented in this work. This hand-made, wooden device is made combining the coil windings of an array of three single transducers. Taking advantage of the sea waves sway, a linear oscillating motion is produced in each transducer generating an electric pulse. Magnetic fundamentals are used to deduce the electrical model of a single transducer, a solenoid-magnet device, and after the model of the whole harvesting array. The energy obtained is stored in a battery and is used to supply a stand-alone system pay-load, for instance a telecom relay or weather station. To maximize the harvested energy, an impedance matching circuit between the generator array and the system battery is required. Two dc-to-dc converters, a buck-boost hybrid cell and a Sepic converter are proposed as impedance adaptors. To achieve this purpose, sliding mode control laws are introduced to impose a loss free resistor behavior to the converters. Although some converters operating at discontinuous conduction mode, like the buck-boost converter, can exhibit also this loss free resistor behavior, they usually require a small input voltage variation range. By means of sliding mode control the loss free resistor behavior can be assured for any range of input voltage variation. After the theoretical analysis, several simulation and experimental results to compare both converters performance are given.

Keywords: harvesting; inductive transducer; sliding mode control; loss free resistor; dc-to-dc converter (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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