Circuit for energizing EAS marker deactivation device with DC pu

Details Circuit for energizing EAS marker deactivation device with DC pu Circuit for energizing EAS marker deactivation device with DC pu

1998-08-13

1999-05-25

Gaffin, Jeffrey

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Systems for magnetizing, demagnetizing, or controlling the...

361189, 361155, 361156, 340572, G08B 1314

Patent

active

059074655

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.

REFERENCES:
patent: 5254974 (1993-10-01), Rebers et al.
patent: 5493275 (1996-02-01), Easter
patent: 5499156 (1996-03-01), Bentley
patent: 5781111 (1998-07-01), Easter et al.

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