Apparatus for and method of controlling operation of...

Details Apparatus for and method of controlling operation of... Apparatus for and method of controlling operation of...

2006-05-12

2009-08-11

Jackson, Stephen W (Department: 2836)

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

Reexamination Certificate

active

07573694

ABSTRACT:
A control circuit turns a transistor on and off in order to energize a drive coil of a solenoid-operated valve in a rated voltage mode at a duty ratio of 100% during a predetermined first period, which is sufficiently long to move a movable element in the drive coil, from the time when an operation command signal starts being applied to the solenoid-operated valve. The control circuit further repeatedly energizes the drive coil in a power-saving mode at a duty ratio smaller than the duty ratio in the rated-voltage mode, during a predetermined second period following the rated-voltage mode. The drive coil is energized alternately in the rated-voltage mode and in the power-saving mode, until application of the operation command signal to the solenoid-operated valve is terminated.

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