Power supply for field mounted transmitter

Details Power supply for field mounted transmitter Power supply for field mounted transmitter

1994-07-13

1996-07-09

Chin, Stephen

Pulse or digital communications

Systems using alternating or pulsating current

455343, 34087016, 364550, H04L 2704, H04L 2712, H04L 2720

Patent

active

055352430

ABSTRACT:
A field mounted transmitter for use in a two-wire process control loop includes a sensor, measurement circuitry and a power supply. The sensor senses a process variable of a process which is transmitted over the control loop by the measurement circuitry. The power supply is powered by a current flowing through the control loop and powers the measurement circuitry. The power supply includes an inductive element coupled to the measurement circuitry and a switch which selectively couples the inductive element to the control loop.

REFERENCES:
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Brochure: "Preliminary LTC1149, LTC1149-3.3, LTC 1149-5; High Efficiency Synchronous Stepdown Switching Regulator," Linear Technology Corporation, Milpitas, California, pp. 1-16, Nov. 1992.
Brochure: "LM494 Pulse Width Modulated Control Circuit," National Semiconductor Corporation, Santa Clara, California, pp. 17-23 (undated).
Brochure: "Maxim High-Efficiency, +5V Adustable Step-down Switching Regulator," Maxim Integrated Products, Sunnyvale, California, pp. 1-8, Copyrighted 1991.
Schematic: Power supply circuited used in a process control transmitter which is believed to have been on sale more than one year prior to the filing of the present application.
Schematic: Power supply circuited used in a process control transmitter which is believed to have been on sale more than one year prior to the filing of the present application.

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