COIL DRIVING CIRCUIT FOR EAS MARKER DEACTIVATION DEVICE

摘要

A device for deactivating a magnetomechanical electronic article surveillance (EAS) marker includes a deactivation coil array and a coil driving circuit (24). The coil driving circuit repetitively energizes the deactivation coil array according to a predetermined timing to generate a magnetic field for deactivating the EAS marker. The driving circuit includes at least one storage capacitor (220), circuitry for charging the at least one storage capacitor and a switching circuit (212) for selectively forming a resonant circuit which includes the storage capacitor and at least some of the coils of the coil array to generate a ring-down signal in the coils. A timing circuit (236) controls the switching circuit to generate the ring-down signal repetitively at the predetermined timing.