Inductive magnetic field generator

Details Inductive magnetic field generator Inductive magnetic field generator

1985-09-17

1987-07-28

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340572, G08B 1324

Patent

active

046834613

ABSTRACT:
An article surveillance system includes a power line activated inductive magnetic field generator having an on duty cycle portion considerably less than 50%. A transformerless AC power line to DC converter and switching circuitry are connected to a series resonant circuit including a coil for deriving the AC inductive magnetic field. During on duty cycle portions, the switches are activated and connected to the series resonant circuit and the power supply to cause resonant current to flow in the series circuit at an activation frequency for the switches, causing the coil to generate the magnetic field at the activation frequency.

REFERENCES:
patent: 4274090 (1981-06-01), Cooper
patent: 4384281 (1983-05-01), Cooper
patent: 4476459 (1984-10-01), Cooper et al.
patent: 4510489 (1985-04-01), Anderson, III et al.
patent: 4531117 (1985-07-01), Nourse et al.
patent: 4565996 (1986-01-01), Close

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