Circuit for energizing EAS marker deactivation device with DC pulses of alternating polarity
US5907465A · kind A · utility
10Cited by
4References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 13, 1998 |
| Grant date | May 25, 1999 |
| Priority date | — |
| Expiry date | Aug 13, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/2411
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A device for deactivating magnetomechanical EAS markers includes a storage capacitor and a coil for generating a deactivation field. A bridge arrangement of four switches interconnects the coil with the storage capacitor and with circuit ground. The switches are controlled to apply a train of DC pulses to the coil such that the pulses have alternating polarities and decreasing amplitudes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.