Coil driving circuit for EAS marker deactivation device
US6181249A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 7, 1999 |
| Grant date | Jan 30, 2001 |
| Priority date | — |
| Expiry date | Jan 7, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/2411
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A device for deactivating a magnetomechanical electronic article surveillance (EAS) marker includes a deactivation coil array and a coil driving circuit. The coil driving circuit repetitively energizes the deactivation coil array according to a predetermined timing to generate a magnetic field for deactivating the EAS marker. The driving circuit includes at least one storage capacitor, circuitry for charging the at least one storage capacitor and a switching circuit for selectively forming a resonant circuit which includes the storage capacitor and at least some of the coils of the coil array to generate a ring-down signal in the coils. A timing circuit controls the switching circuit to generate the ring-down signal repetitively at the predetermined timing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.