Solid state current to pressure transducer

Details Solid state current to pressure transducer Solid state current to pressure transducer

F - Mech Eng,Light,Heat,Weapons

15

B

341/39, 341/38.5

F15B 5/00 (2006.01) G05D 16/00 (2006.01) G05D 16/18 (2006.01) G05D 16/20 (2006.01)

Patent

CA 1229150

Abstract of the Disclosure A transducer for converting an electrical current signal to a pneumatic pressure. A solid state element such as peizo-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 detests 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 require- ments limit terminal voltages, the flapper element is driven by a transconductance amplifier 94 which is powered through a shunt regulator 82 and a voltage tripper 92. The shunt regulator provides operating potentials which are derived from the signal current.

445762

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