A 15 mV Inductorless Start-up Converter Using a Piezoelectric Transformer for Energy Harvesting Applications
Résumé
This paper presents an inductor-less start-up converter for a sub-100 mV energy harvester based on an Armstrong oscillator topology using a piezoelectric transformer and a normally-on MOSFET. Two models of the converter have been detailed and validated experimentally for the start-up phase and steady-state operation to respectively determine the minimum start-up input voltage and the voltage gain. The models have been validated experimentally in a setup associating the converter and a thermo-electric generator. Based on a Rosen-type piezoelectric transformer and off-the-shelf components, the proposed start-up topology begins to oscillate at 15 mV and achieves a 1 V output voltage at only 43 mV. Compared to the literature, the topology needs no inductive component and achieves self-starting operation with a smaller input voltage.
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