Bistable switch remotely operable over telephone line

Details Bistable switch remotely operable over telephone line Bistable switch remotely operable over telephone line

1982-06-21

1983-11-29

Rubinson, G. Z.

H04M 1100

Patent

active

044182449

ABSTRACT:
A bistable switch for controlling a latching relay for connecting and disconnecting an air conditioning load, operable over a telephone line by the application of a short burst of one of a pair of determined frequencies. The switch includes a power supply capacitor (35) charged directly from the telephone line (32, 33). A pair of narrow band filters (39, 40) each respond to one of the pair of frequencies. The output of each filter drives an FET amplifier (60) which in turn drives a charge pump (68, 69). When a sufficient amount of charge is received, the charge pump will provide a firing pulse to one of a pair of SCRs (77). The SCRs are each connected in one leg of a bridge circuit which includes one of a pair of diodes (79). The remaining legs of the bridge are formed by a pair of transistors (80) with the coil (46) of a bistable relay (47) attached across the bridge. The selective firing of one of the pairs of SCRs causes current to flow in one of the two possible directions (86, 87) through the coil either setting or resetting the relay.

REFERENCES:
patent: 3548102 (1970-12-01), Schaum
patent: 3859462 (1975-01-01), Saxon
patent: 4021615 (1977-05-01), James et al.
patent: 4107466 (1978-08-01), Churchill
patent: 4121053 (1978-10-01), Dick
patent: 4174064 (1979-11-01), Pratt
patent: 4221936 (1980-09-01), Vaughn
patent: 4266097 (1981-05-01), Cannon et al.
patent: 4267406 (1981-05-01), Perry
patent: 4345113 (1982-08-01), Shelley

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