Balanced constant current sensing circuit inherently immune to l

Details Balanced constant current sensing circuit inherently immune to l Balanced constant current sensing circuit inherently immune to l

1984-04-23

1986-04-08

Salce, Patrick R.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 97, H02H 908

Patent

active

045816913

ABSTRACT:
A current converter circuit that supplies send and return currents to a balanced transmission line includes current sensing circuitry that responds to a current unbalance or a differential current, independently of longitudinal currents in the balanced line. A reference voltage and two inputs to a comparator monitor the voltage drop across a voltage divider connecting the send and return leads of the transmission line. The voltage divider has a grounded center tap so that longitudinal currents flow to ground and provide equal and opposite polarity voltages across the divider, which cancel each other. Unbalanced currents provide a corresponding differential voltage input to the comparator, whose control voltage output is utilized to initiate corrective action in a current control circuit.

REFERENCES:
patent: 4087646 (1978-05-01), Brolin et al.
patent: 4254443 (1981-03-01), Wilson, Jr.
patent: 4385336 (1983-05-01), Takeshita et al.

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