Isolation circuitry for transmitter electronics in process...

Details Isolation circuitry for transmitter electronics in process... Isolation circuitry for transmitter electronics in process...

G - Physics

08

C

G08C 19/00 (2006.01) G01R 15/14 (2006.01) G05B 9/02 (2006.01) G08C 19/02 (2006.01)

Patent

CA 2227906

A transmitter (12) in a process control system (10) includes isolation circuitry (58) which isolates transmitter electronics (26) from a sensor bridge circuit (32). The isolation circuitry (58) includes high impedance isolators (114, 116) in series with high impedance buffers (106, 108) to electronically isolate the transmitter electronics (26) from the bridge (32). A power supply is isolated using a series of capacitors (174a-c; 178a-c) connected to a periodic signal.

L'émetteur (12) d'un système d'automatisation industrielle (10) comporte un circuit d'isolation (58) isolant l'électronique d'émetteur (26) d'un circuit en pont de capteur (32). Le circuit d'isolation (58) comporte des sectionneurs à forte impédance (114, 116) en série avec des tampons à forte impédance (106, 108) permettant d'isoler électroniquement l'électronique d'émetteur (26) du pont (32). Une alimentation électrique est isolée au moyen d'une série de condensateurs (174a-c; 178a-c) reliés à un signal périodique.

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