Inductively coupled keyable control circuit and keying circuit t

Details Inductively coupled keyable control circuit and keying circuit t Inductively coupled keyable control circuit and keying circuit t

1976-02-13

1977-11-01

Pellinen, A. D.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

H01H 4720, E05B 4700

Patent

active

040568415

ABSTRACT:
A keyable control circuit sequentially connects a widely swept fm rf signal to sensing coils at a plurality of detection locations. While rf energy is fed to one of the sensing coils, all other sensing coils are gated off. A resonant detector generates a first signal when an external keying circuit containing a tuned circuit, resonant at a correct first frequency, is inductively coupled to one of the sensing coils. A time-gated envelope detector generates a second signal when the external keying circuit contains a second tuned circuit resonant at a correct second frequency. When the first and second signals are simultaneously present, gating circuits generate a control output signal which may be used to unlock a door or perform other functions access to which is restricted to those possessing keys.

REFERENCES:
patent: 3597636 (1971-08-01), Kravchenko
patent: 3723967 (1973-03-01), Atkins et al.
patent: 3842324 (1974-10-01), Atkins

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