Endress+hauser Gmbh+co.

Endress U. Hauser Gmbh U. Co.

Jurgen Kruger

Peter Klofer

Dieter Funken

Jurgen Tetard

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.

Growing community of inventors

Lorrach, Germany

Jurgen Kruger