Power supply for field mounted transmitter

G - Physics – 08 – C

Patent

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G08C 19/00 (2006.01) G05B 15/02 (2006.01)

Patent

CA 2194440

A field mounted transmitter (10) for use in a two-wire process control loop (16a/16b) includes a sensor (12), measurement circuitry (18) and a power supply (20). The sensor (12) senses a process variable of a process which is transmitted over the control loop (16a/16b) by the measurement circuitry (18). The power supply (20) is powered by a current flowing through the control loop (16a/16b) and powers the measurement circuitry (18). The power supply (20) includes an inductive element (70) coupled to the measurement circuitry (18) and a switch (64) which selectively couples the inductive element (70) to the control loop (16a/16b).

Emetteur de site de fabrication (10) placé dans une boucle de commande (16a/16b) de processus bifilaire comportant un capteur (12), un circuit de mesure (18) et une alimentation (20). Le capteur (12) détecte une variable de processus qui est transmise au circuit de mesure (18) par l'intermédiaire de la boucle de commande (16a/16b). L'alimentation (20) qui reçoit un courant traversant la boucle (16a/16b) (10) et alimentant le circuit de mesure (18) comporte un élément inductif (70) couplé au circuit de mesure (18) et un sélecteur (64) pouvant coupler l'élément inductif (70) à la boucle de commande (16a/16b).

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