Solenoid current control
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United States of America Patent
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-
Aug 16, 1983
Grant Date -
N/A
app pub date -
Feb 8, 1982
filing date -
Feb 8, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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