Solid state current-to-pressure and current-to-motion transducer

Details Solid state current-to-pressure and current-to-motion transducer Solid state current-to-pressure and current-to-motion transducer

1983-03-28

1985-01-08

Cohan, Alan

Fluid handling

Pressure modulating relays or followers

With counter-balancing pressure feedback to the modulating...

251131, G05D 1600

Patent

active

044922469

ABSTRACT:
A transducer for converting an electrical current signal to a pneumatic pressure. A solid state element such as piezo-electric flapper element 48 is used to vary the pressure drop through a nozzle 46 to provide a controlled pressure supply 28. A micro-power electronic circuit 59 controls the flapper. A solid state pressure sensor 24 detects the output pressure and provides a feedback signal for use in a negative feedback loop to control the flapper element. The flapper element may be triangularly shaped to reduce its responsiveness to relatively low frequency mechanical vibrations. In a exemplary embodiment, where intrinsic safety requirements limit terminal voltages, the flapper element is driven by a transconductance amplifier 94 which is powered through a shunt regulator 82 and a voltage tripler 92. The shunt regulator provides operating potentials which are derived from the signal current.

REFERENCES:
patent: 3456669 (1969-07-01), Lloyd
patent: 3882881 (1975-05-01), MacKenzie
patent: 4325399 (1982-04-01), Frick

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