Low-power relay operating circuit

Details Low-power relay operating circuit Low-power relay operating circuit

1993-10-18

1995-10-10

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361173, 307117, H01H 4700

Patent

active

054575958

ABSTRACT:
A high-power relay with a low-power operating circuit is usable in combination with a low-current source of DC power. The source has a hot terminal and a common terminal and a bistable relay has an energizing relay winding with one terminal of the winding connected to the common terminal of the supply. First and second semiconductor switches are connected to a second terminal, the switches being alternately operable in response to control signals to respectively set and reset the relay. First and second capacitors are connected to the first and second semiconductor switches, respectively, and first and second charging circuits are connected to the low-current source and to the first and second capacitors, respectively, to charge the capacitors from the source. The switches are connected to selectively discharge the capacitors in opposite directions through the energizing relay winding thereby to SET and RESET the relay in response to control signals. A method of operating the circuit is also disclosed.

REFERENCES:
patent: 3629649 (1971-12-01), Del Zotto
patent: 3636357 (1972-01-01), Del Zotto
patent: 4340826 (1982-07-01), Muchnick
patent: 4874962 (1989-10-01), Hermans
patent: 5148158 (1992-09-01), Shah

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