Systems and methods for providing a tag with a miniature zero power motion detector and energy harvester
View Patent ↗Systems and methods for operating a tag. The method comprising: causing motion of a spherical permanent magnet which is disposed and freely movable in a three dimensional internal space of a non-magnetic hollow sphere located within the tag; using the spherical permanent magnet's motion to cause a change in a magnetic flux in a wire wrapped around at least a portion of the non-magnetic hollow sphere, where the change in the magnetic flux induces a current in the wire; and supplying the current to at least one device of the tag's internal electronic devices that is configured to facilitate at least one of an inventory count and an inventory security.
1. A security tag detectable by a wireless tag reader, comprising:
an internal electricity generator comprising:
a non-magnetic hollow sphere forming therein an internal space;
a spherical permanent magnet, disposed and freely movable within the sphere;
a wire wrapped around at least a portion of the sphere;
wherein motion of the magnet in the space induces a current in the wire; and
a security component comprising at least one of a Radio Frequency Identification (“RFID”) component and an Electronic Article Surveillance (“EAS”) component connected to the wire to form a circuit, and operative upon a threshold flow of current to indicate that the tag is in motion.
2. The security tag according to claim 1 , wherein the wire extends in a single direction along an outer surface of the non-magnetic hollow sphere.
3. The security tag according to claim 1 , wherein the wire is wrapped around the non-magnetic hollow sphere in at least two orthogonal directions.
4. The security tag according to claim 1 , wherein the current is generated from 3D motion of the spherical permanent magnet.
5. The security tag according to claim 1 , wherein the security component comprises a communications enabled device.
6. The security tag according to claim 1 , further comprising an energy storage device in electrical communication with the generator and the security component.
7. The security tag according to claim 6 , wherein the energy storage device comprises a rechargeable battery or a capacitor.