Solenoid current control

Details Solenoid current control Solenoid current control

1982-02-08

1983-08-16

Eisenzopf, Reinhard J.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

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

361152, H01H 4732

Patent

active

043994830

ABSTRACT:
The response time and power consumption of a solenoid-type actuator are minimized through exercising control over a transistor connected in series with the solenoid coil and a current source. Upon receipt of a command signal the series connected transistor is driven into saturation for a period of time commensurate with the current flow through the coil to rise to the level where a magnetic field of sufficient magnitude to pull in the solenoid plunger will be generated. The solenoid current is, once the solenoid armature moves, reduced to that level needed to maintain the field by controlling the transistor such that there is a constant voltage across the solenoid winding.

REFERENCES:
patent: 4293888 (1981-10-01), McCarty

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