Loop current detector

Details Loop current detector Loop current detector

H - Electricity

04

B

324/61

H04B 17/00 (2006.01)

Patent

CA 1056917

ABSTRACT OF THE DISCLOSURE A loop current detector for detecting current flowing in a pair of telephone wires having a saturable reactor having first, second and third windings, the first and second windings adapted to be connected in a loop circuit to pass DC current, a resistance connected with the third winding to form therewith a voltage divider, and an oscillator having an AC output connected with the divider, characterized in that the AC voltage drop across the third winding is relatively high when no DC current flows through said loop circuit, and the drop is relatively low when DC current flows through the circuit. A switch having first and second modes of operation with associated outputs, and connect- ed with the voltage divider to be responsive to the oscillator output when the AC voltage drop is relatively high to be switched into the first mode of operation with one associated output, and to be non-responsive to the oscillator output when the AC voltage drop is relatively low to be switched into the second mode of operation with a second associated output.

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