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US 7,119,691 B2Granted
Electronic article surveillance marker deactivator using phase control deactivation
AssigneeSensormatic Electronics Corporation
InventorSteven V. Leone
Life of this patent
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Abstract
A method and apparatus to deactivate an EAS security tag are described.
Claims22
A method comprising:
- generating a first signal to represent zero crossings for an alternating current (AC) input voltage waveform;
- determining a zero crossing period using said first signal;
- retrieving a plurality of delay times using said zero crossing period;
- generating a second signal using said first signal and said delay times;
- and
- applying said AC input voltage to a coil in accordance with said second signal to create a magnetic field to deactivate an EAS marker.
3 more elements
An apparatus, comprising:
- a zero crossing circuit to detect zero crossings of an alternating current (AC) input voltage waveform, and generate a first signal to represent said zero crossings;
- a processor to connect to said zero crossing circuit, said processor to receive said first signal and retrieve a plurality of delay times based on said first signal, and to generate a second signal using said first signal and said delay times;
- and
- a coil circuit to connect to said processor, said coil circuit to receive said second signal and create a magnetic field to deactivate an electronic article surveillance (EAS) marker.
1 more element
An article comprising:
- a processor;
- a computer-readable storage medium accessible by said processor;
- said computer-readable storage medium including stored instructions that, when read and executed by said processor, result in determining a zero crossing period using a first signal to represent zero crossings from an alternating current (AC) input voltage waveform, retrieving a plurality of delay times using said zero crossing period, generating a second signal using said first signal and said delay times, and sending said second signal to a coil circuit to create a magnetic field to deactivate an electronic article surveillance (EAS) marker.
An electronic article surveillance deactivator, comprising:
- a zero crossing circuit to detect zero crossings of an alternating current (AC) input voltage waveform, and generate a first signal to represent said zero crossings;
- a processor to retrieve a plurality of delay times, and generate a second signal using said first signal and said delay times;
- and
- a coil circuit to use said second signal to deactivate an electronic article surveillance (EAS) marker using phase control of said AC input voltage.
1 more element
Dependencies are inferred from the claim text.