Energizing circuit for eas marker deactivation device

Details Energizing circuit for eas marker deactivation device Energizing circuit for eas marker deactivation device

G - Physics

08

B

G08B 13/24 (2006.01) H01F 13/00 (2006.01)

Patent

CA 2336591

A device (10) for deactivating a magnetomechanical EAS marker includes two coils (24, 28, 26, 30) and an energizing circuit (32) for alternately driving the coils. One coil (24, 28) is driven for one cycle of an alternating power signal, and then the other coil (26, 30) is driven for one cycle, and this sequence is repeated. The driving signal (31) is switched from one coil to the other at a point in time which corresponds to a zero crossing of the current level of the driving signal.

L'invention concerne un dispositif (10) permettant de désactiver un marqueur magnétomécanique EAS, comprenant deux bobines (24, 28, 26, 30) et un circuit de d'excitation, de façon à commander alternativement lesdites bobines. Une bobine (24, 28) est commandée pendant un cycle d'un signal de puissance alternatif, puis l'autre bobine (26, 30) est commandée pendant un cycle, cette séquence étant répétée. Le signal de commande (31) est commuté d'une bobine à l'autre en un point, à un moment donné, qui correspond à un passage à zéro du niveau de courant du signal de commande.

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