Abstract
A self-start and self-powered power management circuit for impact-type piezoelectric energy harvester for speed bump is proposed. The piezoelectric impact-type cantilever was used to harvest the energy from speed bump as it is suitable for converting the low-frequency mechanical impact to high-frequency vibrations. Considering that vehicles passing through the speed bump are intermittent and random, a start-up circuit for this power management circuit is designed to save energy during the vacancy of electric energy. This start-up circuit also realizes the self-start and self-powered functions, when rechargeable battery is completely empty, the power management circuit can still transfer energy to load side. The experimental results show that the efficiency of the energy harvesting circuit is approximately 72% for the vehicle speeds of 5–20 km/h, and the controller of the energy harvesting circuit consumes only 3.7% of input energy for the vehicle speed of 20 km/h in active mode, and it doesn't loss any power in sleep mode.
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