Vibrational energy harvester

摘要

Some examples include an energy harvester for use in an electronic device to convert mechanical energy associated with vibrations of the electronic device into electrical energy. For instance, an energy harvester including rows of piezoelectric cantilevers may be arranged around a proof mass and may be utilized to convert the vibrations into electrical energy. In some examples, the energy harvester may include an electromagnetic energy harvester in addition to, or in place of the piezoelectric energy harvester.

主权项

1. A device comprising:
an energy harvester to convert vibrations of the device into electrical energy, the energy harvester including:
a proof mass having a compartment;at least two piezoelectric cantilever transducers extending outward from the proof mass in opposite directions, the piezoelectric cantilever transducers supporting the proof mass to allow movement of the proof mass in response to the vibrations; anda first magnet is partially contained within a first end of the compartment;a second magnet is partially contained within a second end of the compartment, the second end opposite the first end;a coil at least partially wound around at least a portion of the compartment; anda third magnet suspended within the compartment between the first magnet and the second magnet by repulsive magnetic forces of the first magnet and the second magnet; and a capacitor having a first end coupled to the coil and the piezoelectric cantilever transducers to collect the electrical energy generated by the energy harvester and store the electrical energy and a second end coupled to a battery.