Electrical circuit for a self-retaining relay

Details Electrical circuit for a self-retaining relay Electrical circuit for a self-retaining relay

2007-03-29

2009-12-29

Jackson, Stephen W (Department: 2836)

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

Reexamination Certificate

active

07639471

ABSTRACT:
An electrical relay circuit, comprising a load circuit with a series connection of a first generator (G1), a load component (R load) and a relay switch (S1) of a relay (RL1), wherein the relay switch (S1) has a closed position in which the load circuit is closed, and wherein the relay switch (S1) hat a magnetized position in which the load circuit is broken, further comprising an auxiliary circuit with a second generator (G2) for providing a control signal, wherein by means of the control signal the relay switch (S1) can be switched into the magnetised position, and wherein the auxiliary circuit keeps the relay switch (S1) in the magnetized position after the control signal is over, is characterized in that the first generator (G1) is connected to a series connection of the relay (RL1) and a constant current source (CCS) in both positions of the relay switch (S1), that the constant current source (CCS) is connected to an activation circuit (A) comprising the second generator (G2), wherein the constant current source (CCS) can be put into the activated state by the activation circuit (A) when the relay switch (S1) is in the closed position, and that the constant current source (CCS) is further connected to a holding circuit (H), wherein the holding circuit (H) keeps the constant current source (CCS) in the activated state when the relay switch (S1) is in the magnetised position. This simple, self-retaining relay circuit may be operated in a wide range of voltages.

REFERENCES:
patent: 4206443 (1980-06-01), Britton
patent: 4679116 (1987-07-01), Oshizawa et al.
patent: 4888494 (1989-12-01), McNair et al.

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