×

Pulse width modulation control for valves

  • US 3,874,407 A
  • Filed: 01/02/1974
  • Issued: 04/01/1975
  • Est. Priority Date: 01/02/1974
  • Status: Expired due to Term
First Claim
Patent Images

1. A control circuit for a fluid controller, including in combination:

  • first means for generating an error signal;

    first and second signal paths, each of said paths including an integrator, a threshold circuit and an output device;

    second means for connecting said error signal as an input to each of said integrators, with an integrator output connected to the corresponding threshold circuit which in turn provides an output signal to the output device when the integrator output exceeds the threshold level of the threshold circuit; and

    third means for periodically dissipating the integrator outputs.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×