Abstract: An information separation device having a transformer operating as a separating filter to separate transmitted direct current power and alternating voltage information. The transformer has at least two windings on a first side holding power in reserve. Between these windings a capacitor is serially coupled that transmits information signals. The windings are coupled at their other ends to transmission lines for direct current power and alternating voltage information. The transformer has another winding on the second side that processes received information. Two controllable inverse valves are coupled by their output electrodes between the transmission lines. The control electrodes of the valves are coupled to a load-independent voltage source during a transmission signal.

Abstract: A circuit for serial data communication and power transmission between a main controller and a sub-station along two balanced transmission lines. The circuit includes a power supply for providing a DC voltage to the sub-station along the transmission lines. A main controller sending circuit generates two data signals of substantially equal magnitude and opposite polarity and supplies the data signals to the transmission lines. A sub-station receiving circuit detects the data signals, on the transmission lines and converts the data signals into a serial format output data signal.