Active AC/DC control for wideband piezoelectric energy harvesting

[摘要] This paper proposes a simple interface circuit enabling resonant frequency tuning of highly coupled piezoelectric harvesters. This work relies on an active AC/DC architecture that introduces a tunable short-circuit sequence in order to control the phase between the piezoelectric current and voltage, allowing the emulation of a capacitive load. It is notably shown that this short-circuit time increases the harvested power when the piezoelectric operates outside of resonance. Measurements on a piezoelectric harvester exhibiting a large global coupling coefficient (k2= 15.3%) have been realized and have proven the efficiency and potential of this technique.

[发布机构] Univ. Grenoble Alpes, CEA, LETI, MINATEC, Grenoble; F-38000, France^1;Univ. Savoie Mont Blanc, SYMME, Annecy; 74000, France^2

[效力级别] 能源学

[关键词] Capacitive loads;Circuit sequence;Interface circuits;Piezoelectric currents;Piezoelectric energy harvesting;Piezoelectric harvester;Resonant frequency tuning;Short circuit time