Driving circuit for electromagnetic relay

Details Driving circuit for electromagnetic relay Driving circuit for electromagnetic relay

1997-09-23

1999-05-25

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327385, H03K 353

Patent

active

059072520

ABSTRACT:
A driving circuit for the electromagnetic relay provides a coil of the electromagnetic relay with stepped voltage having a first voltage which is slightly larger than a minimum operating voltage which caused the coil to generate magnetic field capable of closing contacts of the electromagnetic relay and a second voltage higher than the first voltage, in response to a triggering signal to trigger the electromagnetic relay. According to this structure, because the first voltage lower than the second voltage is applied to the coil firstly, the contacts are closed by attracting force of the coil risen gently. As a result, the bouncing of the moving contact can be prevented. In addition, the response time required for the closing of the contacts can be prevented to become long.

REFERENCES:
patent: 3654489 (1972-04-01), Knapton
patent: 3798608 (1974-03-01), Huebner
patent: 3944912 (1976-03-01), Angel et al.
patent: 4539466 (1985-09-01), Yamamato
patent: 4928779 (1990-05-01), Yamada
patent: 5406440 (1995-04-01), Wieloch
patent: 5546268 (1996-08-01), Hurley et al.

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