Modem coupling circuit for power-line carrier

Details Modem coupling circuit for power-line carrier Modem coupling circuit for power-line carrier

2006-03-28

2006-03-28

Nguyen, Tuyen T (Department: 2832)

Inductor devices

With closed core interrupted by an air gap

Reexamination Certificate

active

07019611

ABSTRACT:
A modem coupling circuit comprising: (a) a transformer1having a core1aincluding a gap formed therein, primary windings N1a, N1bconstituting a bifilar wound coil which is wound around the core1a, forming a single layer and connected to power lines L1, L2, and a secondary winding N2connected to a transmitting circuit2and a secondary winding N3connected to a receiving circuit3, the secondary windings N2, N3holding the single layer of the primary windings between; (b) a coupling capacitor C1connected to a middle point between first ends of the primary windings, the first ends being not connected to the power lines L1, L2; (c) current limiting resistances R1a, R1bconnected to the primary windings N1a, N1bhaving a bifilar construction; (d) drive resistances R2a, R2bconnected to the secondary winding for transmission N2; and (e) terminating resistances R3a, R3bconnected to the secondary winding for reception N3.

REFERENCES:
patent: 3627952 (1971-12-01), Person
patent: 3781483 (1973-12-01), Deisch
patent: 4646319 (1987-02-01), Engel et al.
patent: 4982426 (1991-01-01), Jakab
patent: 5255317 (1993-10-01), Arai et al.
patent: 8-98277 (1996-04-01), None
patent: 2001-136107 (2001-05-01), None
patent: 2001-186063 (2001-07-01), None
patent: 2001-267139 (2001-09-01), None

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