Optimum Piezoelectric Energy Harvesting with Buck Boost Circuit in Discontinuous Conduction Mode
Keywords:
Battery-less Buck Boost, energy harvester, piezoelectric, power conditioning.Abstract
The amount of energy extracted from a piezoelectric transducer is greatly depend on its load. Optimum load must be connected to the transducer for optimum energy transfer. In practice, it is nearly impossible to always match the circuit load with the optimum load required. Hence, interfacing circuit is essential. This interfacing circuit must be able to provide fix optimum impedance to the ransducer regardless the actual circuit load connected. This paper discusses the design of high efficiency piezoelectric energy harvester. The energy harvester is intended to harvest energy from a pushbutton piezoelectric generator powering a battery-less
circuit. A buck boost topology is used to provide optimum impedance to the piezoelectric for optimum energy harvesting. The value of impedance seen by the transducer can be adjusted by setting the value of its inductor, clock frequency and duty cycle.
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