Apparatus for generating ungrounded voltages

Details Apparatus for generating ungrounded voltages Apparatus for generating ungrounded voltages

1974-05-06

1976-03-02

Pellinen, A. D.

Electricity: power supply or regulation systems

Remote sensing

178 68, 323 75N, G05F 146

Patent

active

039420981

ABSTRACT:
A circuit arrangement for facilitating the determination of a wire break in a line interconnecting a plurality of subscriber stations in a direct current, keyed data transmission system. Each subscriber station is equipped with a bridge circuit containing a balancing resistance, bridge resistances and a fourth arm formed by the transmission line. A transmitter is connected in one diagonal of the bridge, and the receiver in another. An operational amplifier forms a first voltage source connected in the line circuit and a second voltage source connected in the balancing arm generates a monitoring current flow. The two operational amplifiers forming these voltage sources function as differential amplifiers, and the voltages are adjusted to the same value by a single balancing operation.

REFERENCES:
patent: 2772387 (1956-11-01), Liguori
patent: 3623140 (1971-11-01), Nercessian

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