Method and apparatus for controlling a solenoid within an electr

Details Method and apparatus for controlling a solenoid within an electr Method and apparatus for controlling a solenoid within an electr

1999-05-03

2000-05-09

Fleming, Fritz

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361154, H01H 900

Patent

active

060612258

ABSTRACT:
A driver circuit is provided to control current flow through a solenoid coil of an electric liquid dispensing device including a valve element and a dispensing orifice. The driver circuit includes a bidirectional current source coupled to the solenoid coil for applying current in opposite directions through the coil. In a forward current direction, a magnetic attraction is created between the solenoid coil and the valve element to retract the valve element from the dispensing orifice. In a reverse current direction, a magnetic repulsion is created between the solenoid coil and the valving element to force the valving element toward the dispensing orifice. The magnetic flux generated in the solenoid coil by the forward current is calculated, and the reverse current is applied to substantially demagnetize the solenoid.

REFERENCES:
patent: 4399483 (1983-08-01), Phelan
patent: 4453652 (1984-06-01), Merkel et al.
patent: 4665348 (1987-05-01), Stupak, Jr.
patent: 4718454 (1988-01-01), Appleby
patent: 4904919 (1990-02-01), McNaughton
patent: 5375738 (1994-12-01), Walsh et al.
patent: 5666286 (1997-09-01), Nojima et al.
patent: 5812355 (1998-09-01), Nojima

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