Control circuit for current to pressure converter

Fluid handling – Pressure modulating relays or followers – With counter-balancing pressure feedback to the modulating...

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1374875, G05D 1600

Patent

active

044819676

ABSTRACT:
A current-to-pressure converter receives an electrical input signal, such as a DC current, which is a function of a sensed parameter and which is indicative of a desired output pressure. An electrical-to-pressure transducer provides an output fluid pressure as a function of an electrical control signal. A function of the output pressure is sensed by a sensor which provides an electrical feedback signal which is a function of such pressure. The feedback signal is compared to a command signal derived from the electrical input signal. When a change in the sensed parameter occurs, the electrical input signal changes, which in turn results in a change in the command signal. The electrical control signal changes, thereby changing the output pressure until the feedback signal has changed sufficiently to return the command signal and feedback signal to a balanced state.

REFERENCES:
patent: 2842147 (1958-07-01), Markson
patent: 2914076 (1959-11-01), Zimmerli
patent: 2928409 (1960-03-01), Johnson et al.
patent: 2939430 (1960-06-01), Westbury
patent: 2941723 (1960-06-01), Severns
patent: 2993497 (1961-07-01), Coles et al.
patent: 3063422 (1962-11-01), Gregowski et al.
patent: 3113582 (1963-12-01), Hudson
patent: 3134425 (1964-05-01), Oppenheimer et al.
patent: 3390694 (1968-07-01), Rouvalis
patent: 3456669 (1969-07-01), Lloyd
Fisher Control Company, Bulletin 13.1:546, "Type 546 Electro-Pneumatic Transducer", May 1965.
Foxboro Company, Bulletin T131-125a, "E69 Series Current-to-Pneumatic Converters and Positioner".

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