Supply current regulator for two-wire sensors

Details Supply current regulator for two-wire sensors Supply current regulator for two-wire sensors

1999-10-28

2000-09-12

Nguyen, Matthew

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

G05F 304

Patent

active

061182605

ABSTRACT:
A current regulator is provided for a two wire sensor and comprises first and second conductors arranged to provide a sensor output current, a first resistance and a current reference coupled across the first and second conductors, and a second resistance and sensor load terminals coupled across the first and second conductors. An amplifier has first and second inputs and an output. The first input is coupled to a first junction between the first resistance and the current reference, the second input is coupled to a second junction between the second resistance and the sensor load terminals, and the output is connected to the second input. The amplifier controls a first voltage at the first junction to be substantially equal to a second voltage at the second junction.

REFERENCES:
patent: 4446417 (1984-05-01), Fox et al.
patent: 5917312 (1999-06-01), Brkovic
patent: 5973936 (1999-10-01), Lenz et al.

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