Circuit for energizing eas marker deactivation device with...

G - Physics – 08 – B

Patent

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G08B 13/24 (2006.01)

Patent

CA 2338849

A device for deactivating magnetomechanical EAS markers includes a storage capacitor (12) and a coil (10) for generating a deactivation field. A bridge arrangement of four switches (SW1-SW4) interconnects the coil (10) with the storage capacitor (12) and with circuit ground. The switches are controlled to apply a train of DC pulses to the coil (10) such that the pulses have alternating polarities and decreasing amplitudes.

L'invention concerne un dispositif permettant de désactiver des marqueurs de système électronique de surveillance d'articles (EAS) magnétomécanique, comprenant un condensateur de mémorisation (12) et une bobine (10) destinée à produire un champ de désactivation. Un agencement en pont de quatre commutateurs (SW1, SW2) interconnecte ladite bobine (10) avec le condensateur de mémorisation (12) et le circuit de mise à la terre. Les commutateurs sont commandés afin d'appliquer un train d'impulsions de courant direct à la bobine (10) de sorte que ces impulsions présentent des polarités alternantes et des amplitudes décroissantes.

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