Patent ID: 6140940
Filing Date: 2000-10-31
Classification: G08C

Abstract:
An assembly for signal transmission between a transmitter location and a receiver location connected to each other by a two-wire conductor via which an analog signal current, variable between two limit values, is transferred, representing a measured variable sensed by a sensor in said transmitter location and forming the supply current necessary for operating said transmitter location, said transmitter location comprising a circuit generating a constant operating voltage for said transmitter location and a controllable current source being provided in said transmitter location, this current source determining the current flowing via said two-wire conductor as a function of said measured variable, wherein said circuit generating said operating voltage for said transmitter location is a switching regulator and that in said transmitter location a controllable voltage regulator is provided, the output voltage of which changes in the opposite sense of said signal current and forms the input voltage of said switching regulator.