Trigger circuit for an electromagnetic device

Details Trigger circuit for an electromagnetic device Trigger circuit for an electromagnetic device

1991-05-30

1993-08-10

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Systems for magnetizing, demagnetizing, or controlling the...

361152, 361194, 361196, 123490, H01H 4704

Patent

active

052354903

ABSTRACT:
A trigger circuit for an electromagnetic device, in particular a solenoid valve of an injection system for an internal-combustion engine, has a control element for causing excitation of the electromagnetic device to be lowered at least once and then raised after the electromagnetic device is activated. The control element has a delay circuit which slows down the rate at which excitation of the electromagnetic device changes during the lowering and/or raising action.

REFERENCES:
patent: 4148090 (1979-04-01), Kawai et al.
patent: 4351299 (1982-09-01), Costello
patent: 4385339 (1983-05-01), Takada et al.
patent: 4726389 (1988-02-01), Minoura et al.
patent: 4949215 (1990-08-01), Studtmann et al.

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