Circuit for transmitting a measurement current from an intrinsic

Details Circuit for transmitting a measurement current from an intrinsic Circuit for transmitting a measurement current from an intrinsic

1997-06-26

1999-05-25

Horabik, Michael

Communications: electrical

Continuously variable indicating

With particular transmitter

34087039, 363 74, G08C 1906

Patent

active

059072920

ABSTRACT:
This circuit arrangement comprises a transformer (2) for transmitting a measurement current (I), which is output by a sensor arrangement (1) at a measurement location situated in an intrinsically safe area (10), to a non-intrinsically safe area (20), in which a current measuring resistor (5) is situated. A DC converter (3) serves for the power supply of the sensor arrangement. A transformer (2) belongs to the DC converter (3), has a primary winding, which faces the non-intrinsically safe area, two identical partial windings (21, 22) connected in series in the same sense, and a single secondary winding (23), which faces the intrinsically safe area. A first end of the current measuring resistor (5) is connected to a circuit zero-point (SN) and a second end to a center tap of an output stage (31) of the DC converter (3). The center tap is connected to the input of an offset adjusting stage (6), an output of which is connected to the input of a voltage/current converter (7). A power source (4) is connected to the junction point of the partial windings (21, 22) and to the circuit zero-point.

REFERENCES:
patent: 3764880 (1973-10-01), Rose
patent: 4532510 (1985-07-01), Bertrand
patent: 4725839 (1988-02-01), Crowe

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