Invention Grant
- Patent Title: Controlled current solenoid driver circuit
- Patent Title (中): 控制电流螺线管驱动电路
-
Application No.: US301731Application Date: 1981-09-16
-
Publication No.: US4453652APublication Date: 1984-06-12
- Inventor: Stephen L. Merkel , Richard P. Price
- Applicant: Stephen L. Merkel , Richard P. Price
- Applicant Address: OH Amherst
- Assignee: Nordson Corporation
- Current Assignee: Nordson Corporation
- Current Assignee Address: OH Amherst
- Main IPC: F16K31/06
- IPC: F16K31/06 ; B05C5/02 ; H01F7/18 ; B67D3/00 ; H01H9/00
Abstract:
A solenoid driver circuit for a solenoid-operated fluid dispenser in which a valve is operable to dispense a fluid under the control of the solenoid. The driver circuit receives externally applied turn-on and turn-off signals and energizes the solenoid in response to these signals. The driver circuit is responsive to a turn-on signal to couple a pull-in voltage across the solenoid to pull in a solenoid valve armature. The driver circuit is also operable to sense the level of current in the solenoid. When the solenoid current reaches a preset peak current level, the pull-in voltage is removed from the solenoid and replaced by a hold-in voltage. When the hold-in voltage is applied to the solenoid, the driver circuit is operable to control the level of the hold-in voltage in order to maintain a preselected hold-in current in the solenoid. The driver circuit controls the solenoid current so that it makes a gradual transition from the peak solenoid current level to a steady state hold-in current level. The voltage applied to the solenoid to establish the steady state hold-in current is removed by the driver circuit in response to an externally applied turn-off signal.
Public/Granted literature
- US6119284A Floating pool cover support Public/Granted day:2000-09-19
Information query