Abstract
Piezoelectric devices previously studied usually generated a single voltage to power an electronic device. However, depending on the user’s purpose, the electronic device may need dual power supply. Here, we report a self-powered bipolar voltage generator using a piezoelectric energy harvester with two piezoelectric devices. When a force is applied to the piezoelectric energy harvester, the two piezoelectric devices separately supply positive and negative voltages to the operational amplifier that requires dual power supply to amplify an AC signal that have positive and negative polarity. At the same time, the harvester supplies additional power to an electronic device through a DC-to-DC converter with an output voltage of 3.3 V. This technique proves the feasibility of applying the piezoelectric energy harvester to operational amplifying systems in the field of sound, earthquake, and sonar that require both bipolar and single voltages without external power sources.
Highlights
Most electronic devices need electrical energy to operate
Positive and negative cycles exist in the piezoelectric energy harvester (PEH) with a sine waveform obtained by the vibration exciter
The PEH consisted of two piezoelectric devices with an insulating layer to prevent energy loss
Summary
Most electronic devices need electrical energy to operate. When a battery is discharged, it must be recharged or replaced. As recharging and replacing are inconvenient, energy harvesting technologies have been developed to use renewable electricity from wasted energy. The technology used to supply power to electronic devices by energy harvesting is an integral part of modern society. The main advantage of energy harvesting using piezoelectric materials is suitable to capture small scale vibrations. This harvesting method is unaffected by nature. Various methods have been researched to obtain renewable electrical energy from environmental energy wasted [1,2,3,4,5]
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