Broadband dual phase energy harvester: Vibration and magnetic field
- Broadband dual phase energy harvester: Vibration and magnetic field
- 송현철; Prashant Kumar; Rammohan Sriramdas; Hyeon Lee; Nathan Sharpes; Min-Gyu Kang; Deepam Maurya; Mohan Sanghadasa; 강형원; 류정호; William T. Reynolds Jr.; Shashank Priya
- Piezoelectric energy harvesting; Magnetic field energy harvesting; Broadband resonance; Dual phase; Magnetic coupling
- Issue Date
- Applied energy
- VOL 225, NO 1-1142
- Broadband mechanical energy harvesting implies stable output power over a wide range of source frequency. Here we present a cost-effective solution towards achieving broadband response by designing a magnetically coupled piezoelectric energy harvester array that exhibits a large power density of 243 μW/cm3 g2 at natural frequency and bandwidth of more than 30 Hz under 1 g acceleration. The magnetically coupled piezoelectric energy harvester array exhibits dual modes of energy harvesting, responding to both stray magnetic field as well as ambient vibrations, and is found to exhibit the output power density of 36.5 μW/cm3 Oe2 at 79.5 Hz under the ambient magnetic field while maintaining the broadband nature. The magnetically coupled piezoelectric energy harvester array was demonstrated to harvest continuous power from a rotary pump vibration, an automobile engine vibration and a parasitic magnetic field surrounding a cable of an electric kettle. These demonstrations suggest that the magnetically coupled piezoelectric energy harvester array could serve the role of a standalone power source for wireless sensor nodes and small electronic devices.
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