Solenoid cassette pump with servo controlled volume detection

Details Solenoid cassette pump with servo controlled volume detection Solenoid cassette pump with servo controlled volume detection

2005-09-13

2005-09-13

Freay, Charles G. (Department: 3746)

Pumps

Motor driven

Electric or magnetic motor

C417S479000, C417S505000, C417S477200

Reexamination Certificate

active

06942469

ABSTRACT:
Servo controlled solenoids provide actuation of a pump piston and valves, and electronic LC resonance measurements to determine liquid volume and gas bubble volume. Third order nonlinear servo control is split into nested control loops: a fast nonlinear first-order inner loop causing flux to track a target by varying a voltage output, and a slower almost linear second-order outer loop causing magnetic gap to track a target by controlling the flux target or the inner loop. The inner loop uses efficient switching regulation, preferably based on controlled feedback instabilities, to control voltage output. The outer loop achieves damping and accurate convergence using proportional, time-integral, and time-derivative gain terms. The time-integral feedback may be based on measured and target solenoid drive currents, adjusting the magnetic gap for force balance at the target current.

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