Electricity: electrical systems and devices – Control circuits for electromagnetic devices – For relays or solenoids
Patent
1976-02-13
1977-08-16
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
For relays or solenoids
340147F, 340171PF, 340258C, 343 65LC, 361182, 361203, E05B 4900
Patent
active
040429709
ABSTRACT:
A keyable control circuit generates a narrow-band FM signal. A keying circuit, containing two tuned circuits, placed next to the tank coil of the keyable control circuit, absorbs rf energy each time the FM signal sweeps past the resonant frequency of one of the tuned circuits. Detector circuits within the keyable control circuit, upon sensing the amplitude modulation imposed by the cyclic absorption by one of the tuned circuits, cause the rf frequency of the FM signal to jump to a second frequency region. If the second tuned circuit in the keying circuit matches the new frequency, detector circuits again detect the amplitude modulation imposed by the cyclic absorption. After detecting the second signal, the keyable control circuit generates an electrical control signal output for use by external circuits.
REFERENCES:
patent: 3182315 (1965-05-01), Sweeney
patent: 3671721 (1972-06-01), Hunn et al.
patent: 3732465 (1973-05-01), Palmer
patent: 3891980 (1975-06-01), Lewis et al.
patent: 3970824 (1976-07-01), Walton et al.
Moose Jr. Harry E.
Wagner Electric Corporation
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