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Flow Rate Accuracy of a Fluidic Delivery System

  • US 20090140184A1
  • Filed: 10/21/2008
  • Published: 06/04/2009
  • Est. Priority Date: 10/26/2005
  • Status: Active Grant
First Claim
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1. A valve assembly with variable flow rate of fluid delivery, comprising:

  • a power supply;

    charge pump circuitry powered by the power supply;

    a piezoelectric actuator charged by the charge pump circuitry, the charge applied across the piezoelectric actuator reaching a predetermined voltage threshold over a predetermined rise time; and

    a valve transitioning from a CLOSED state to an OPENED state when the charge applied across the piezoelectric actuator exceeds the predetermined voltage threshold;

    the valve assembly having a duty cycle adaptable to vary the flow rate of the fluid delivered by the valve.

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