Energy Harvester

© Fraunhofer ISIT / photocompany, Itzehoe

Energy Harvesting is the utilization of energy that is available in the operating environment of a component. Common harvesters are solar cells that use light energy for electrical applications. ISIT's Energy Harvester uses integrated micromagnets to mechanically excite a piezoelectric element. This provides an electrical voltage. Compared to other approaches, the magnetically excited harvester of ISIT has several advantages:

  • A wide range of mechanical excitation frequencies and mechanical shocks can be used.
  • Besides vibrations, rotary movements can also be used for excitation. Magnets on the rotating component excite the integrated magnets of the harvester. This also allows the excitation frequency to be selected independently of the rotational frequency.
  • The harvester can use electromagnetic radiation. For example, it is possible to realize a wake-up electronics that works without any stand-by power.
  • Due to the magnetic force coupling no seismic mass is necessary. This enables an extremely compact design, which results in comparatively high performance per component area.



Pixelated micromagnets enable magnetic force coupling for energy harvesting