Techniques for deactivating electronic article surveillance...

G - Physics – 08 – B

Patent

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G08B 13/24 (2006.01)

Patent

CA 2610443

A deactivator having a deactivation antenna coil and a capacitor to store energy. The deactivator converts the stored energy to an alternating current over a deactivation period to generate a deactivation magnetic field when driven through the deactivation antenna coil during the deactivation period. The alternating current defines a ring down envelope during the deactivation period. An energy recovery module having an electrical impedance is coupled to the deactivator to recover a portion of the energy converted to the alternating current during a portion of the deactivation period based on the impedance. Other embodiments are described and claimed.

L'invention concerne un dispositif comprenant un désactivateur comportant une bobine d'antenne de désactivation et un condensateur servant à stocker de l'énergie. Le désactivateur est conçu pour convertir l'énergie stockée en courant alternatif sur une période de désactivation afin de produire un champ magnétique de désactivation lorsqu'il est activé par la bobine d'antenne de désactivation durant la période de désactivation. Le courant alternatif définit une enveloppe de perte durant la période de désactivation. Le dispositif comprend également un module de récupération d'énergie possédant une impédance électrique donnée, couplé au désactivateur, permettant de récupérer une partie de l'énergie convertie en courant alternatif durant une partie de la période de désactivation, sur la base de l'impédance. L'invention concerne également d'autres modes de réalisation de l'invention.

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