Logic signal circuit for a releasing relay

Details Logic signal circuit for a releasing relay Logic signal circuit for a releasing relay

1988-09-20

1990-07-03

Pellinen, A. D.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

361152, 361159, H04M 300

Patent

active

049397761

ABSTRACT:
A circuit and method which eliminates the voltage spike generated by inductive kick, and generates a signal which is active while a relay is being released and for a given period thereafter. This signal can be used to power down circuits supplying signals to relay contacts, thereby allowing the relay to release without current or voltage potentials at its contact, e.g. dry switching. The generated signal may also be used to disable sensors which might give false indications while the relay contacts are switching. In telephone line circuits, the generated signal can be used to disable the telephone hook switch detector or to power down the battery feed circuit feeding the subscriber line. The relay coil energy generates a signal which is active while the relay is being released. The invention uses a minimum number of components and the circuit is adjustable as to how long the generated signal remains active after the relay is released.

REFERENCES:
patent: 3558910 (1971-01-01), Dale et al.
patent: 3560796 (1971-02-01), Landis
patent: 4146752 (1979-03-01), Koenig
patent: 4300024 (1981-11-01), Wever et al.
patent: 4438472 (1984-03-01), Woodworth
patent: 4572927 (1986-02-01), Huft
patent: 4733326 (1988-03-01), Harsch et al
patent: 4774624 (1988-09-01), Qualich

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