Simplified self-latching relay switching circuit

Details Simplified self-latching relay switching circuit Simplified self-latching relay switching circuit

1991-05-24

1993-10-05

Pellinen, A. D.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361187, H01H 4732

Patent

active

052510930

ABSTRACT:
A simplified self-latching relay switching circuit includes a switch, a power shunt circuit including a power node and a shunting device for shunting power from the node to ground, a relay for latching power into the circuit, and a passive circuit which operates the shunting device. When the switch is activated a first time, power is applied to the power shunt circuit, and the node voltage rises according to an RC time constant. The passive circuit is clamped to the node, so a voltage in the passive circuit is prevented from rising rapidly. When the node voltage reaches a threshold value, the relay is activated, latching power into the power shunt circuit. If the switch is then activated a second time, the clamp no longer restrains the passive circuit voltage from rising rapidly. The rapid rise of the passive circuit voltage activates the shunting device, which deactivates the relay to unlatch power to the power shunt circuit, and shunts the node voltage to ground.

REFERENCES:
patent: 3089985 (1963-05-01), Camfield et al.
patent: 3193733 (1965-07-01), Orsino
patent: 3629608 (1971-12-01), Trindle
patent: 4031435 (1977-06-01), Zioni et al.
patent: 4420787 (1983-12-01), Tibbits et al.
patent: 4468715 (1984-08-01), Reno, Jr.
patent: 4603370 (1986-07-01), Imazeki et al.
patent: 4724504 (1988-02-01), Prouty
patent: 4841404 (1989-06-01), Marshall et al.

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