Assembly for signal transfer between a transmitter location and

Details Assembly for signal transfer between a transmitter location and Assembly for signal transfer between a transmitter location and

1998-06-03

2000-10-31

Horabik, Michael

Communications: electrical

Continuously variable indicating

With supply voltage regulation or compensation

34087019, 34031001, 34031002, 34031006, H04M 1104

Patent

active

061409405

ABSTRACT:
In an assembly for signal transmission between a transmitter location and a receiver location connected to each other by a two-wire conductor an analog signal current, variable between two limit values, flows via this two-wire conductor. This signal current represents a measured variable sensed by a sensor in the transmitter location and forms the supply current necessary for operating the transmitter location. The transmitter location comprises a circuit generating a constant operating voltage for the transmitter location. Also provided in the transmitter location is a controllable current source being provided, determining the current flowing via the two-wire conductor as a function of the measured variable. The circuit generating the operating voltage for the transmitter location is a switching regulator and in the transmitter location a controllable voltage regulator is provided, the output voltage of which changes in the opposite sense of the signal current and forms the input voltage of the switching regulator.

REFERENCES:
patent: 3783387 (1974-01-01), Wernli
patent: 4520488 (1985-05-01), Houvig
patent: 4806905 (1989-02-01), McGowan
patent: 5014050 (1991-05-01), Lewiner et al.
patent: 5742225 (1998-04-01), Wetzel

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