Digital servovalve drive

Details Digital servovalve drive Digital servovalve drive

1977-06-29

1979-02-27

Heyman, John S.

Fluid handling

Pressure modulating relays or followers

Jet control type

328 58, 307265, 328 69, F15B 500, F16P 500, G05D 1620

Patent

active

041413768

ABSTRACT:
A digital system for producing a bipolar rectangular waveform of fixed frequency having a duty cycle proportional to the magnitude of an input digital word is provided to drive a servovalve. The digital word is input to a modulator which outputs a fixed frequency rectangular waveform whose duty cycle varies from 0 to 100% dependent upon the magnitude of the digital word. In order to adapt this output to drive a fail-fixed servovalve in which maximum flow occurs at a predetermined portion of maximum rated current, a scaling network is provided which limits the variation in the duty cycle of the output square wave.

REFERENCES:
patent: 3668560 (1972-06-01), Padalino et al.
patent: 3697879 (1972-10-01), Holliday
patent: 3836858 (1974-09-01), Kitano
patent: 3874407 (1975-04-01), Griswold
patent: 4001699 (1977-01-01), Denny et al.

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