Rf adapter for field device with variable voltage drop

G - Physics – 05 – B

Patent

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Details

G05B 15/02 (2006.01) G05B 23/02 (2006.01)

Patent

CA 2726601

A wireless adapter for use in a two- wire process control loop (22) includes wireless communication circuitry and first and second terminals configured to couple in series with the two-wire process control loop (22). A regulator (152) having a regulated input is coupled to the first terminal and an output. A shunt (154) is coupled to the output of the regulator (152) and is configured to provide power to the wireless communication circuitry. A feedback circuit (158) is configured to control current flowing from the regulator (152) to the shunt (154) as a function of a loop current flowing through the two- wire process control loop (22).

L'invention concerne un adaptateur sans fil à utiliser dans une boucle de commande de traitement à deux fils (22), qui comporte des circuits de communication sans fil et une première et une seconde borne destinées à se coupler en série à la boucle de commande de traitement à deux fils (22). Un régulateur (152) ayant une entrée régulée est couplé à la première borne et une sortie. Un shunt (154) est couplé à la sortie du régulateur (152) et est destiné à alimenter les circuits de communication sans fil. Un circuit de rétroaction (158) est destiné à commander le courant s'écoulant du régulateur (152) vers le shunt (154) en fonction d'un courant en boucle traversant la boucle de commande de traitement à deux fils (22).

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