Valves and valve actuation – Electrically actuated valve – Having means to produce digital pulses
Reexamination Certificate
2000-10-31
2010-06-22
Rivell, John (Department: 3753)
Valves and valve actuation
Electrically actuated valve
Having means to produce digital pulses
C361S154000, C361S187000
Reexamination Certificate
active
07740225
ABSTRACT:
A fluid dispenser having a dispensing valve movable between open and closed positions for controlling the flow of the fluid from the fluid dispenser. A solenoid is operatively connected to the dispensing valve and is capable of moving the dispensing valve between the open and closed positions. The fluid dispenser further includes a power supply having a voltage and a driver circuit electrically connected to the solenoid and the power supply. The driver circuit provides an output signal to the solenoid having a time variable component, for example, a peak current duration, determined as a function of the voltage of the power supply. Thus, the driver circuit automatically adjusts to, and can be used with, power supplies of different voltages. The invention further includes a method by which the driver circuit provides the output signal as a function of the power supply voltage.
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Burr Brown Corp.,Application Notes, DRV102 PWM Solenoid/Valve Driver, 1998.
Nordson Corporation
Rivell John
Rost Andrew J
Wood Herron & Evans L.L.P.
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